Do-it-yourself pipe bending along the radius. How to bend a profile for a greenhouse with your own hands? Alternative ways of bending

When conducting construction works more and more often bent profile pipe is used. The design and manufacturing methods of these materials endow them with excellent characteristics.

Therefore, many are interested in how to bend profile pipe at home. After all, such a need arises often.

It should be noted right away that profile pipe products have more aesthetic appearance than their round counterparts. And bending can be done:

1. in a specialized workshop.
2. Independently, at home.

If preference is given to the second option, then you should know that for these actions you will have to have certain knowledge. Watch the video on our website and you will succeed.

Features of bending profile assortment

The fact is that when changing the configuration, the pipe is affected by two forces:

• compression, which has an effect from the inside;
• tension acting from the outside.

When a professional pipe is bent incorrectly, it changes its shape and loses the coaxial location of some sections. Also, a stretching wall may simply not withstand mechanical stress and become unusable. In addition to these problems, incorrect contraction and wrinkling of the inner wall of the folded workpiece can occur.

It is not uncommon for cases that it is easy to bend a pipe from a profile along a radius, but the workpiece is crumpled. After that, it is already suitable only for scrap metal.

The combination of these factors affects the unjustified increase in costs, which a serious owner will never allow. Therefore, despite the fact that this pipe range is quite flexible, you should not rush to process it, and before bending the pipe along the radius at home, it is important to study the technology in detail. This will be discussed further.

Technology should not be neglected. Only for a master armed with knowledge, the question of how to bend a profile at home will not create big problems. All recommendations on how to bend profiled metal products correctly are given by professional craftsmen who have studied this problem in practice for a long time.

The influence of the technical characteristics of the material on the choice of bending method

First, you need to know that the concept of "trade pipe" includes an assortment of any geometric configuration. But, to make it easier to understand, it is customary to call profile assortment the following form:

• square;
• rectangular;
• oval, etc.

This is associated with the fact that round views put in the design of the pipeline for the supply of liquid or gas, where significant pressure is provided. A profile of a different shape is found in various household structures and structures.

Square rolled metal is distinguished by the cross-sectional index and the dimensions of the walls. Both of these factors indicate the minimum angle for bending rolled metal, at which it will not become unusable.

There are a lot of engineering nuances in the question of how to bend a product without a pipe bender. But you don't need to know all of them to work from home. But it is important to know the following.

1. Thin products with a cross section of up to 20 mm without a pipe bender must be bent in an area that is 2.5 times longer than the height of the pipe itself.
2. Thick rolled metal can be bent without a pipe bender in an area that is three times longer than the section. If this point is ignored, then the metal will crack on the outside or deform from the inside.
3. Bending a profile pipe is dangerous in one respect: the occurrence of a fracture at the site of the operation, as a result of which the part is sent for final marriage or for rework for smaller products.
4. The limiting condition is the following ratio - the minimum radius should not be less than two and a half dimensions along the bend section. For example, for a profile with a thickness of 40 mm, the minimum internal radius will be 40 x 2.5 = 100 mm.

Before bending a steel profile pipe at home, one more rule should be remembered.

After exposure, the pipe strives to return to its original shape. For this reason, if you bend on your own, without a profile bender, then it is better to bend a little more than is necessary according to the scheme. If you bend the workpiece a little more, then in the end the rounding will turn out as the scheme requires.

All these conventions must be taken into account before bending one or another rolled metal, otherwise it is useless to get enough of a high-quality end result.

Methods that are used to bend

Do-it-yourself bending of a profile pipe at home is done in the following ways:

• Bending by means of special technical devices. People call them pipe benders.
• Using various hand tools.
• Applying physical strength. But, this is only true for small diameters.

If you make a bend at home, then you need to consider:

• The amount of bend.
• Manufacturing materials.
• The value of the wall thickness.
• Section.

IMPORTANT! Measures for the deformation of profile pipe-rolling products are carried out in acceptable norms, set to the cross section and wall thickness. During operation, it is necessary to control that the cross section does not flatten and that internal fractures do not occur.

See how to bend a professional pipe and common mistakes, and below is a video of the process.

How to bend over the mandrel

In home workshops, rolled metal with a wall thickness of no more than 3 mm can be bent using a mandrel. The best option to solve the problem, if you need to bend a professional pipe by 20 with your own hands, a profile bending machine is used, on the upper part of which there is enough space for finishing equipment. Such devices perfectly cope with products with a diameter of 40 mm.

When changing the shape of the assortment by 20 and 40 mm, on the workbench choose optimal space to set the element to commit. To facilitate the work on one side of the machine, there are holes that are located close to each other.

The problem of how to bend a profile pipe at home without a mandrel pipe bender is not difficult to solve. The required radius during deformation is obtained due to the installation of a special template. For its manufacture, thick plywood is used. But, if work on bending profile pipes is required to be done often, then you can make a template from a metal corner.

Bending with the use of internal countermeasures

There are many different ways how to bend a pipe without a pipe bender along the radius at home. Here are some of them.

These methods refer to work using improvised means.

Any greenhouse, gazebo, and other home extension cannot do without the use of a bent professional pipe. And practice shows that the question of how to bend a profile pipe does not create any difficulties.

The most important thing during the deformation of a professional pipe without special manual fixture at home - this is the safety of the tubular product itself. And home craftsmen solve the problem of how to bend the profile in the following ways:

• finishing with a grinder or welding;
• using a spring
• filling of rolled metal with sand;
• bend with water.

Each method on how to bend a professional pipe yourself without a pipe bender that a home master can use has its own advantages and disadvantages. You need to familiarize yourself with them in order to stop at the most optimal option for your conditions.
Watch the video

Bending without a pipe bender - cutting with a grinder and welding

In order to bend the product without a pipe bender with your own hands, cross cuts are made at the place of the intended bend. Only three sides of the pipe are sawn, and the fourth is left untouched.

To determine the number of cutouts and sizes, a simple calculation should be made. How to do this, consider an example. So, you need to bend on a pipe 30 x 50 mm at an angle of 180 degrees (full turn) with a radius of 100 mm along a wall of 30 mm.

Payment:

1. The length of the semicircle of the outer radius is determined from the ratio:
   L \u003d 2: 2, where - the number Pi \u003d 3.14; r is the outer radius of rounding, equal to 150 mm; L is the length of the semicircle.

1. In the same way, the length of the semicircle of the inner radius of the bend Lin is determined.
2. The difference between the values ​​of the outer and inner radii will be the desired value of the total length of the slots on the inner radius.

Lout \u003d L - Lin.

1. Having carried out the necessary calculations, we obtain the result of 157 mm.
2. Based on the width of the cut with a grinder of 5 mm, we get that 157: 5 = 31 slots must be made on 315 millimeters along the bend plane.

After that, the resulting part is simply bent by hand until the ends of the cutouts touch. The slots must be welded and the welds cleaned with a grinder. The gaps that remain after such manipulations are welded, and the welding spots are cleaned.

IMPORTANT! If the work is not done correctly, or the bend radius is not observed, then the bent pipe may be damaged in the end result. And it's impossible to fix everything. You must act slowly. This is the main rule that should not be violated.

Cutting with a grinder and welding is the formation of an angle by means of a cut, in which one surface of the pipe blank remains intact.

Since the metal in this case is subjected to thermal influence, it is necessary to treat the bent profile with anti-corrosion protection at the end.

Using a spring and a blowtorch

The second method - a spring, which allows you to get curved rolled metal, is also a variation of the method of using internal countermeasures.

This is also a common way to bend without a pipe bender. To work from steel wire with a two-millimeter diameter make a square-shaped spring.

It is made so that it fits into the pipe. It should pass freely, and at the same time there should be a gap of at least one millimeter. Next, the place of the bend is heated with a blowtorch. Then, using the prepared blank, the product is bent to the desired parameter.

If something does not work out, then the result can be corrected. But, it's better to do it all at once. With repeated processing, the metal becomes brittle.

Using sand to bend the pipe

It is possible to perform the deformation of communication at home without a pipe bender using ordinary sand, poured into the workpiece.

One side of the pipe is closed with a cork or any improvised object. This closed end is fixed in a vise.

The workpiece is filled with sand and heated with a blowtorch in the place where the bend is planned. The product is then folded the right dimensions.

After the procedure is completed, it is left to cool. So the material fixes the acquired dimensions.

Professional craftsmen warn that there is one important nuance: in order to qualitatively bend the product with your own hands, you need to take the sand clean and pre-calcined.

Wooden corks, which clog a pipe filled with sand, are easily removed with self-tapping screws. Thus, it turns out to bend the workpiece very quickly.

Water exposure

In winter, bending the profile pipe on your own can be done using the following original method.

Watch the video

The workpiece is filled with water, and the extreme parts are muffled wooden stoppers. Then it is taken out to the street so that the filled liquid freezes.

You can bend this pipe in accordance with the template and without much physical effort. Its cross section is preserved during this procedure. After obtaining the desired result, the plugs are removed, and the liquid is poured out.

There is another simple option, but it can only be used to bend duralumin and brass gauge. Before starting work, prepare a template. The tube is filled with water, as in the previous case.

Watch the video

But, then it moves to a place with a low temperature. When the water freezes, rounding is performed using a blank. It should be noted that this method allows you to get the ideal shape of the rounding, and in this case, large forces from the hand of the master are not required to bend.

From the material presented, it is clear that bending a profile pipe with your own hands is not a matter of high complexity. If you approach the process competently and study the materials in detail, you can save a lot of money, time and effort. Also, do not forget the safety rules.

All the described methods are very effective, but only in the case of actions according to certain rules.

Watch the video

Watch the video tutorials, drawings and photos presented on the site and you will be able to do everything correctly and yourself.

Bending fixtures

Skillful people, not spoiled in life by unobtrusive service, invent ways for themselves to simplify the performance of rather complex operations, including profile bending.

One of these devices is the simplest lever with a template,

Using such a simple device, it is possible to accurately manufacture arched elements for a greenhouse or greenhouse, gazebo support posts and other details for a summer cottage exterior.

Advanced site owners, showing ingenuity and resourcefulness, make more complex devices from improvised materials that allow them to perform work with increased accuracy. Usually these are kinematic copies of 3-roll bending devices.

Such devices use manual drives, but if the design is developed further, it may well be Starting point for development own business.

Pursuing flexible profiles at home, you need to consider a number of circumstances:

• when purchasing profiles, make sure that they are all the same size and steel grade and belong to the same delivery lot;
• when using welded profiles, orient the side with a seam to the inner radius, otherwise it may break;
• when working with a grinder, do not forget to use protective equipment in the form of glasses or a mask;
• it should be borne in mind that it is not always possible to bend the end sections to the required size, therefore, when calculating the length of the workpiece, it is necessary to take into account their length and cut off such pieces at the end of the formation of the part;
• after installing the products in place, it is necessary to carry out anti-corrosion treatment of the metal and continue to do it regularly.

Bending services

Such a service could not but become a separate area of ​​business development, since it involves the use of a rather complex technological equipment.

Video - how to bend a profile pipe

Profile pipe bending services are also on the market and involve the execution of both radius bending and arch bending. Separation occurs in this way because specific equipment is used for each of these operations. In the first case, this is a pipe bender, in the second, a three-roll rolling.

It must be admitted that the price indicators for performing such operations are very acceptable, as follows:

• the cost of one corner bend is 30 rubles;
• one running meter arched span will also cost 30 rubles.

In comparison with the cost of metal and delivery of material in the Moscow region, this is really practically for nothing.

Special devices for bending

Speaking about how to bend a profile pipe at home using a pipe bender, you should carefully watch the video below.

After watching the video clip, it immediately becomes clear that the device that bends pipe products with a circular cross section is not suitable in this situation.

If you bend the pipe using rollers and rounded shoes, then cracks will appear on it, or it will simply deform.

Bending machines for such a process use those designed specifically for products of a certain type. You can buy a bending machine, or you can do it yourself at home.

Making a bending machine with your own hands

To create a bending machine, the best option is manual view devices. The design of the structure depends on the diameters with which to interact.

For pipe materials with a diameter of up to 20 mm, a simple fixture can be made consisting of steel pins placed in concrete slab. The pipe inserted between the pins is bent to the desired dimensions.

But, when the diameter exceeds 20 mm, then for the construction it is necessary to develop more complex drawings of a bending machine for a profile pipe.

A pair of rollers with a round side section on the edges is fixed to a stable, powerful base. The radius of this face of the roller must match the diameter of the pipe product to be bent.

The workpiece is inserted between the rollers and its end is fixed. The other end is attached to the winch, and it is put into action. When the angle on the pipe reaches the required parameter, the winch is stopped.

ADVICE. The network provides many drawings of pipe benders prepared by craftsmen. The main thing to pay attention to is whether the scheme has everything exact dimensions. Otherwise, the work of the bending machine may not be of high quality.

Watch the video

The whole process of creating a pipe bender with your own hands must be divided into the following steps.

1. Making shafts and fixing gears and bearings on them. The gears are fixed through the key. Bearings are advised to be purchased complete with supports.
2. Gears and chain are suitable for any machine. Parts from a foreign car are of better quality.
3. Using welding machine, the base is cooked, and the clamp shaft is screwed to it.
4. Next, weld the spring nuts and a platform for them.
5. Screw the support shafts at the bottom.
6. A tension chain is being built.
7. At the final stage, the handle is attached to the shaft. To it (to make it easier to bend), it is advised to use a handle that rotates.

Such a device quickly performs deformation by passing a tubular product through it.

The creation of such a bending machine is quite inexpensive. And such a device will come in handy in a private house very often, and in some cases it turns out to be simply irreplaceable.

These are the most simple pipe benders, after watching the video materials and studying the drawings, it will be possible to learn how to bend correctly and choose the best design option.

It is not difficult to cope with such a slave as making a bending machine, but it will save money. This saving can be about 20 - 30 thousand rubles.

See profile bending drawings.

Entries

If available and self-arrangement of a private house or cottage, almost every developer once faces the need to bend pipes. Many people think about how to bend a profile pipe at home when building greenhouses, gazebos and other buildings of this type on the site.

And this is not surprising, given that profile pipes look noticeably more advantageous in comparison with products of an ordinary round section.

However, if a pipe with a circular cross section can be bent with an ordinary pipe bender, then it will not be possible to bend the profile pipe with it, since in conventional hydraulic pipe benders the rollers and shoes have a rounded bend, which, when trying to bend the profile pipe, will lead to cracks, kinks, or the pipe will simply flattened.

Profile pipe bending methods

How to bend the profile pipe yourself in this case, avoiding its damage? For this purpose, several methods are used, one of which is bending by means of special machines that are designed just for shaped pipes.

Machines of this type are called profile benders. Nevertheless, the cost of such machines is very decent, and why does an ordinary homeowner need professional equipment?

If you do not need to bend a professional pipe all the time, but from time to time, you can find manual pipe benders on sale that are suitable for both profile and “round” pipes, which, moreover, are not so expensive - up to about $ 100. At the same time, it must be borne in mind that in the process a manual pipe bender will require significant physical effort.

With a single need to bend a profile pipe, it is not advisable to purchase a tool and it is better to contact a workshop or workshop of the corresponding profile, which will provide the necessary service for reasonable money, or else sell a ready-made bent product.

This option will save both time and money, while the result of resolving the issue will be exactly the one that is needed - bending the profile pipe to the desired radius.

Another method that is often practiced in such cases is to bend the profile pipe with your own hands using, so to speak, folk remedies. However, in this way it is possible to bend pipes of small sections - steel, copper, polymer.

Bending profile pipes with pipe benders

Features of bending

How to bend a profile pipe yourself? This should be done based on the size of its cross section, wall thickness, the material from which it is made, as well as the bending radius.

In addition, the production conditions, the required bending accuracy and the quality of the resulting product must be taken into account.

Bending of profile pipes is carried out within technical tolerances for wall thickness and section size. In this case, the task is to avoid such undesirable phenomena as kinks on the inside of the bent pipe and flattening of its cross section.

Before you bend a square pipe along a small radius, you need to remember that you should bend closer to the ends, since in the middle part the pipe will be more difficult to succumb to.

Performing a pipe bend

To perform the bend, you will need a pipe bender specifically designed for cold stretch bending. The tension generated by such a tool will shift the neutral axis of the pipe in the direction of the bend, which reduces the likelihood of a corrugated surface at the bend.

While in the machine, the pipe is wrapped around the edges and stretched, and at the same time it bends when the bending template moves.

How to bend a stainless steel pipe without losing the quality of the pipe? To prevent the loss of resistance of the pipe walls at the bend, bending is carried out under internal hydrostatic pressure: plugs are put on the ends of the pipe and liquid is fed into it, after which a bending template is brought to the middle of the pipe, with the help of which the bend is performed, giving the pipe the desired shape.

Pipe bending at home

You can bend a profile pipe with your own hands without the help of special machines and tools. And in most cases, you can achieve a bend of really good quality.

Performing bending using a grinder and welding

Before you bend the profile pipe, you will need to arm yourself with a grinder and a conventional welding machine.

Bending is performed in the following sequence:

1. Calculate the radius of curvature of the pipe.
2. Along the length of the bent section, uniformly transverse cuts are made on three sides.
3. After that, the pipe is easily bent.
4. Weld the sawn places.
5. Process and grind the place of welding.

In this way, an impressive external result can be achieved with the desired bending radius of the pipe.

Bending using internal countermeasures

One of these tools can be a specially made spring. Before bending the profile pipe, a square spring is wound from a steel wire 1-4 mm thick (depending on the thickness of the pipe being bent).

The value of each of the sides of the spring segment must be 1.5-2 mm less than the internal values ​​of the pipe section so that the spring can penetrate inside the pipe without any effort.

After installing the pipe in the place of the intended bend, immediately before bending the profile pipe, the bent section is heated with a blowtorch. Next, the pipe is bent on a blank, the radius of which is equal to the required inner radius of the bending pipe.

If necessary, bend in the winter, a somewhat original method can be applied.

So, how to bend a profile pipe:

1. A copper pipe is filled with water, having previously closed one of its ends with a cork.
2. Expose the pipe to frost until the liquid freezes completely.
3. bending copper pipe after that, it can be made according to a template of the corresponding radius with virtually no loss of section and without effort.

Dural and brass pipes can be bent in the same way.

How to bend a professional pipe without a pipe bender? Prepare several buckets of dry and clean sand. If it was not possible to get clean sand, the usual one, lying in the yard, will also do.

It will need to be sieved and dried properly by calcining it on a fire or using gas burner until the sand ceases to soar and smoke. After processing and cooling, the sand is poured into a dry and clean container.

Before bending a square pipe, a wooden wedge is hammered into it from one side to a depth of 10-20 cm, and then prepared clean and dry sand is poured into the free hole of the pipe until the pipe is completely filled. Next, a similar wedge is hammered on the other side of the pipe and the bending process begins directly.

The operation, as in previous cases, is performed using a blank with a diameter corresponding to the required inner bending radius. If the bend is too steep (small radius), the bend can be heated with a torch. Sand, tightly packed into the pipe, will not allow it to lose integrity or be severely deformed.

At the end of bending, one of the plugs is burned out at the stake, sand is removed from the pipe, and the second plug is knocked out or burned out of the pipe. It will not take much more time to bend in this way, in comparison with how to bend a profile pipe using a pipe bender.

The methods of bending profile pipes presented in the article will be effective if all of the above conditions are met, however, bending is really High Quality in every sense of the word can be achieved only with the help of professionals who will perform work on equipment specially designed for this. Approach work with skill, only thanks to this it will be possible to achieve the desired result, while spending a minimum of money and effort.

If you started a repair, then you may need pipes. But not always in this case they should be perfectly even. This raises the question of how to bend a pipe without a pipe bender. If you are familiar with the tricks of this process, then you can solve the problem quite simply.

How to bend a pipe at a right angle

Metal acts as a sufficiently strong material, but with a special impact it can be bent. To date, there are several ways to solve this issue. The first technology is the use of pegs. But you must remember that this method can damage the pipe or even break it. This can be avoided by filling the internal cavity with dry sand. Plugs should be installed at both ends.

The next step is to start bending. To do this, pegs are dug into the ground. You will use them as leverage. If you are not confident in your abilities, then first you should practice on unnecessary pipe sections. If you are faced with the question of how to bend a pipe without a pipe bender, then with the help of this technology you can change the shape of the product, the diameter of which varies from 16 to 20 mm. For pipes of a larger diameter, this technique is not suitable, since the process will be quite complicated. It is also important to take into account the material that underlies. For example, for galvanizing it is recommended to use other methods.

Use of heating technology

Before bending a pipe without a pipe bender, you should think about what technology is best suited for this. Heat may be the best solution. This method is commonly used for steel and aluminum piping. For the procedure, the product is fixed in a vice, but first it must be filled and heated with a gas burner in the place that you plan to bend. The temperature is determined quite simply: when a piece of paper approaches the pipe, it should begin to smoke. When a steel billet is used, it should turn red when heated. For safety, the master should wear gloves.

Plano-parallel plate

If you are faced with the task of how to bend a pipe without a pipe bender, you can use a plane-parallel plate. This technique involves fixing the product in the clamp. After that, you can bend, and this must be done along the plate. This technique is considered not only economical, but also simple. In order to achieve a positive result, several plates should be used, each of which has a different curvature. The main condition is the use of a steel pipe. The length of the product should be quite impressive.

Using a metal spring

Quite often, home craftsmen think about the question of how to bend a pipe without a pipe bender at home. To do this, you can use a metal spring. This technique is excellent for non-ferrous metal pipes, which have good ductility.

A spring is used to prevent deformation. To get a good result, the size of the spring should be taken into account, which must correspond to the inner diameter metal structure. This requirement is due to the fact that the pipe is to be inserted into the cavity. After that, bending can be carried out by tying the spring with a wire to simplify the process of further extraction.

If you need to bend a profile pipe without a pipe bender, water can be used as a filler instead of sand. The cavity of the pipe is filled, after which the product is clogged on both sides with plugs. Freeze the water and then heat the material. However, this method cannot be used for galvanized blanks.

Profile pipe and its modification

This type of metal structure is quite popular in the construction of greenhouses and gazebos on personal plot. Main Feature building material stands out that when bent it can be damaged. The way out of this situation may be to fill the internal cavity with fine sand or water. These actions allow you to eliminate the possibility of damage to the pipe and achieve an excellent result. This technique is suitable for brass and duralumin pipeline.

If you are thinking about the question of how to bend a pipe without a pipe bender for a canopy, then you can use it for this. It is used for square profile products. The pipeline is installed on reliable supports, and then a mallet is used. Actions must be careful and smooth to eliminate the possibility of damage. If it is necessary to achieve a large angle, then to facilitate the process, it is necessary to heat the pipe in the place where it should be bent.

Metal-plastic bending methods

Quite often, owners of suburban real estate are wondering how to bend a pipe without a pipe bender. When metal-plastic is available, you can use your own strength without using improvised means. The product is clamped and smoothly bent. In this case, it is important to exclude the possibility of an inflection. It is important to follow the rules that say that for every 2 cm of the workpiece, the bending angle can be 15 °.

If you are faced with the question of how to bend a pipe without a pipe bender for a greenhouse, then you can use pieces of wire that fill the internal cavity. This allows you to achieve an even and smooth bend in the shortest possible time. Dry fine sand can be used as a filler. It falls asleep inside, and the edges are closed with plugs. Then one end of the product must be fixed, ensuring the reliability and strength of fastening. With a gas burner or blowtorch the fold point should be heated. The material is checked for readiness with a piece of paper.

Polypropylene pipe bending methods

If you need to change the direction of the bend, you can use one of two possible methods. The first involves heating the fold. For this, a building hair dryer is usually used. The optimum heating temperature is 150 °C. Hands should be protected with gloves that are resistant to high temperatures.

At the final stage, the product is bent to the desired shape. The thickened wall should be located with outside bending. Once the material has cooled, it will need to be checked for cracks and dents. Another way to bend such a pipe is cold. However, the bending radius should not be more than 8 diameters, otherwise the product may break.

How to bend plastic pipe

In order to bend a PVC pipe, you need to buy fiberboard. Of these, you can build a frame that will be needed to give the structure a certain shape. As soon as you give the plate the desired shape, you should sand it, it is better to use fine sandpaper for this.

The next step is to form a silicone shell for the plastic blank. It will act as a fastener for the PVC structure in the frame. In addition, it will perform a protective role against chips, mechanical damage and scratches. The object is placed in a prepared protective shell, and after the bending point is heated. The plastic softens and sits on the frame. Such actions will allow you to get the desired shape of the plastic blank. The product is left until it cools down. This will take 15 minutes. After the PVC pipe can be removed from the frame, leaving it to cool completely.

If you are faced with the question of how to bend an aluminum pipe without a pipe bender, then you can use a grinder to carry out the work, with which several thin cuts must be made at the site of the intended bend. The product is pre-clamped in a vise. As soon as the cuts are made, they should be cleaned of chips, only after that you can begin to bend the pipe.

Sometimes the product needs to be bent in the form of a circle. As soon as the ring closes, the holes are welded, and some craftsmen even use a soldering iron for this. In order to make the fold point neat, it is additionally ground and coated protective agent. This avoids corrosion and premature failure of the joint.

Conclusion

It doesn't matter what material the pipe is based on. It is quite difficult to achieve the ideal bend. But if you first get acquainted with the theory, then it will be possible to bend the pipe even without a pipe bender.

The question of how to bend a profile pipe without using special equipment for this is asked by many of those who are going to build a greenhouse on their backyard. These structures are made from bent pipes, not only let in significantly more light, but are also highly resistant and durable when compared to wooden block structures. It seems that bending a professional pipe, creating from it arched structure, is not easy, but if you understand the features of this process, it is quite possible to effectively carry it out using the simplest devices for this.

What is the complexity of profile bending

The essence of bending rolled metal, regardless of the shape of its profile, is that the profile pipes are given a partial or complete bend. Such a technological operation is performed in two ways: by acting on the bent pipe only by pressure or by additionally heating the section of the pipe in the area of ​​which the bend is performed. During the bending metal pipe two forces act simultaneously:

• compression force (from the inside of the bend);
• tensile force (from the outer part of the bent section).

It is the impact of such multidirectional forces that causes difficulties characteristic of the bending process of any profile pipes.

1. Segments of the material of the pipe, which changes its shape during the bending process, may lose the coaxiality of their location, which leads to the fact that individual sections of the pipe will be located in different planes;
2. The wall of the pipe, located on the outside of the bend and subjected to tension, may not withstand the load and burst.
3. The inner wall of the pipe, subjected to compression, may become covered with folds that resemble corrugations.

If you do not take into account the subtleties of such technological process, then instead of bending the profile pipe, you can simply crush the product, irrevocably damaging it.

To prevent this from happening, it is necessary to take into account not only the characteristics of the pipe material, but also its geometric parameters - section dimensions, wall thickness, radius to which it is necessary to bend. Knowing the above will allow you to choose suitable technology and bend the corrugated pipe correctly without crushing it and without getting a corrugated surface.

The need for profile accounting

The category of profile pipe-rolling includes products that have different shape cross-section - round, square, oval or flat-oval. Despite this diversity, for the construction of a greenhouse or a canopy, rectangular or are mainly used. This is due to the fact that it is much easier to mount the outer coating on their flat walls.

The range of modern profile pipes is very diverse. Their geometric parameters, the main of which are the cross-sectional area and wall thickness, determine the plastic capabilities of the product. The latter characterizes such an indicator as the minimum allowable radius of curvature. It is this parameter that allows you to determine to what minimum radius the pipe can be bent so that it is not damaged.

To determine such a parameter of a pipe with or a rectangular profile as the minimum bending radius, it is enough to know the height of its profile. If you are going to bend the profile pipe with cross section in the form of a rectangle or square, the following recommendations should be followed.

• Pipes whose profile height does not exceed 20 mm can be bent in sections whose length exceeds a value equal to 2.5xh (h is the profile height).
• Products whose profile height exceeds 20 mm can be successfully bent in sections whose length corresponds to 3.5xh or more.

Such recommendations will be useful to those who are going to bend profile pipes with their own hands in order to make racks, canopies and various frame structures from them. In this case, however, it should be borne in mind that the possibility of high-quality bending of pipes is also affected by the thickness of their wall. Products with a wall thickness of less than 2 mm should not be bent at all, and if it is necessary to create structures from them, use welded joints.

At home, it is possible to bend professional pipes, which are made of carbon or low-alloy steels, only taking into account certain nuances. Such pipes after bending can spring back and return to their original state, therefore prefabricated structures needs to be re-patterned. The amount of springback is characterized by such a parameter of shaped pipes as the plastic moment of resistance - Wp. This parameter indicated in the accompanying documentation (the lower it is, the less the professional pipes will spring during their bending).

Features of the most popular pipe bending methods

In industrial or domestic conditions, professional pipes are bent both with heating and in a cold state. Heating, which is produced using a gas burner, significantly increases the ductility of the metal, so that less effort is required to bend. Pipes of small cross section can be bent without heating, since they already have good ductility.

Regulatory recommendations regarding the use of heat are only available for products with a round section. So, it is recommended to heat pipes with a cross-sectional diameter of more than 10 cm before bending. In cases where it is necessary to bend square or rectangular pipes, it is worth focusing on your own experience or the advice of other home craftsmen.

1. Without preheating, pipes are bent, the profile height of which does not exceed 10 mm.
2. If the height of the pipe profile exceeds 40 mm, they must be heated before bending.

If you have a pipe bender at your disposal, with its help you can easily cope with the task of cold bending pipes, the profile height of which is in the range of 10–40 mm. In the absence of such a device, it is necessary to decide how to bend the pipe without a pipe bender, having previously carried out simple tests. They will help you determine whether the pipe should be heated before the flexible one or not. These tests are carried out as follows. One end of the pipe is clamped in a vise, and a pipe with a large internal section is put on the other. If with the help of such a shoulder it is possible to bend a pipe clamped in a vise, this process can be carried out without preheating.

Pipe bending according to various methods the tutorial video demonstrates well, but it will not be superfluous to study this process in detail first.

Pipe bending with preheating

In order to bend the profile pipe using the hot method with your own hands, you must first fill it with sand. This will make the bend better and more uniform. Since you will have to deal with hot metal, all work should be done in thick canvas mittens. The bending itself, the implementation of which can be found in the video, is performed in the following sequence.

• Both ends of the profile pipe must be closed with plugs, which are made of wooden bars. The length of such plugs should be 10 times the width of their base, which, in turn, should have an area twice the area of ​​the hole in the pipe closed with their help.
• After fitting the plugs to the internal section of the pipe, 4 longitudinal grooves are made on one of them, which are necessary to remove the gas that accumulates in the pipe when the sand filling it is heated.
• The section of the pipe that you plan to bend must first be annealed.
• As a filler for the pipe, sand of medium grain size should be used. If there is no purified building sand, you can take any, even from a children's sandbox, but it should be prepared accordingly. Thus, the sand is first sieved through a sieve with a mesh size of 2–2.5 mm to remove gravel and small stones from it, and the final sifting is performed on a sieve with a mesh size of 0.7 mm. The final sifting is necessary in order to remove dust inclusions from the sand, which can sinter when heated.
• Prepared sand must be calcined at a temperature of 150 degrees Celsius.
• Before filling with sand, one end of the pipe is closed with a plug, on which there are no gas outlet channels. A funnel is inserted into the second end, through which prepared sand is poured in portions. In order for the sand to evenly and densely fill the entire internal cavity of the pipe, when falling asleep, it is necessary to tap on the walls of the product, using a wooden or rubber mallet for this.
• After the pipe is completely filled with sand, its second end is also closed with a plug.
• The area that will be heated for further bending should be marked with chalk.
• The pipe must be fixed in a vise with a template or in a pipe clamp. It is important that the weld, if it is on the surface of the product, is on the side. It is necessary to adhere to this requirement because it is undesirable to subject the weld to compression or tension.
• A section of the pipe, previously marked with chalk, is heated red-hot with a gas burner. After complete warming up, the pipe is carefully, without making sudden movements, bent in one step, applying efforts strictly in a vertical or horizontal plane.
• After cooling bent pipe the result obtained is compared with the template. If everything is fine, then corks are removed from the ends of the product and sand is poured out.

This method, which is easy to implement at home, is best used in cases where a single angular bend must be formed on a professional pipe. Repeated heating of the metal can lead to a loss of its strength, and this cannot be avoided if you bend the pipe to use it as an element of the arched structure.

How to bend a pipe without preheating

It is possible to bend the profile pipe yourself, without preheating it, both with and without filler. Do not require filling with sand or rosin pipes, the profile height of which does not exceed 10 mm.

There is another technique that involves the use of a spring with a dense coil of coils instead of a filler, which is inserted into the internal cavity of the professional pipe and protects the product walls from deformation, as well as from excessive changes in their thickness during the bending process.

For those who need to bend profile pipes with their own hands, without first heating them, you can use the training video and the following simple recommendations.

1. It is possible to obtain the required bend on profile pipes using the simplest devices - a vice, mandrels, bending plates.
2. Can be used for products with a round profile. In this device, it is necessary to redo the working rollers, the shape of the recess in which must correspond to the pipe profile.
3. You can bend pipes most efficiently and accurately with the help of which you can purchase or make yourself.

Pipe bending tools

The question of how to bend a pipe without a pipe bender will not cause difficulties if you use the simplest devices to perform this operation. You can perform cold bending of pipes using the following devices.

• In cases where it is necessary to bend soft (aluminum) or steel pipe with a profile height of not more than 10 mm, a horizontal plate with holes is used, into which stops are inserted - metal pins. With the help of these pins, products are bent according to the required parameters. At this method There are two serious drawbacks: the low accuracy of bending, and also the fact that when using it, it is necessary to apply significant physical effort.
• Products with a profile height of 25 mm are best bent using roller fixtures. The pipe is securely fixed in a vice, and a force is applied to that part of it that needs to be bent using a special roller. This fixture allows you to get a better bend, but also requires the application of physical effort.

Option, as they say, in haste. The long lever of this extremely simple device allows you to cope with rather thick pipes.

To form a bend with a large radius of curvature on steel or aluminum corrugated pipes, fixed rounded templates are used, on which special clamps are mounted to fix the product. On such a device, the pipe is also bent manually, with force laying it in the groove of the template, the shape of which exactly corresponds to the required bending radius.

Plywood and metal staples are all you need to make a bending template

bending plate

To effectively bend steel or aluminum pipes at home, you can make a modernized bending plate using the following guidelines.

1. The role of such a plate is played by a panel, which is cut out of sheet metal of great thickness.
2. The panel, made in this way, is welded to the rack, which is installed on a special pedestal.
3. Two holes are drilled in the panel, necessary for installing bolts that serve as stops for the profile pipe.
4. A special nozzle is installed on one of the stop bolts, with the help of which the bending radius is adjusted.
5. To ensure the alignment of the pipe sections adjacent to the bend, a metal plate is placed above the workpiece, fixed with bolts.

When you are not using this upgraded pipe bender, its pedestal can be adapted to perform various plumbing tasks.

Mandrel bending

For bending profile pipe products at home, the wall height of which does not exceed 25 mm, a special mandrel can be made. For these purposes, it is better to use an overall workbench, on the surface of which there will be enough space for such a device. To select the optimal location of the element that fixes the bendable pipe, often located holes are made at one end of the workbench. A special template is responsible for ensuring the required bending radius of the corrugated pipe, which can be made from thick plywood or a metal corner if you are going to use it often.

Profile bending application

Of course, if you have a significant amount of work on bending profile pipes, it is better to make a special machine for this, the drawings of which are easy to find on the Internet. We will not analyze this issue here, since it is considered in more than detail in the articles on the links below.

You can not do without such a machine even if you need to bend pipes with a large profile section. The main working bodies of such a machine, which is characterized by wide versatility, are three rolls, two of which are fixed motionless, and by changing the position of the third, the bending radius of the product is adjusted. As a drive for such a device, a chain drive and a handle that is rotated by the operator are used.

Obviously, there are a lot of options for devices that allow you to effectively bend profile pipes for the manufacture of a greenhouse, a canopy or other structures. Having considered these options and choosing from them the one that best suits your capabilities and needs, you can always provide yourself with a convenient and inexpensive pipe bender.

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The design of the greenhouse must necessarily have not only an aesthetic appearance, but also be functional. A greenhouse that was built by hand or was bought in ready-made, should generate income regardless of the time of year. If you have a thought on your own, then the question may arise about how to bend a profile for a greenhouse with your own hands without using any special devices.

The frame for the greenhouse can be bought or made by hand. In order to bend the frame, you will need special. fixtures - pipe bender or machine.

For example, a winter greenhouse arch type, which has heating, turns the need to bend the profile for this design into an urgent need.

The frame made of aluminum profiles is durable, lightweight, requires minimal maintenance, in addition, it can be easily fixed with your own hands.

Greenhouses in which profile designs are used

Greenhouse frame aluminum profile with a multi-pitched roof is a strong, reliable, lightweight construction.

Elements that are made from profiles are used in many types. The multi-pitched roof of an 8-coal greenhouse has solid construction. The material for the frame in this case will be an aluminum profile.

The profile can be forged, molded, rolled. It curls up into coils. The aluminum profile has the ability to process mechanically: twist, drill, cut. Structures from this type of profile can be connected with synthetic resins or fastened with rivets, bolts.

The profile can be shaped, complete, intended for the manufacture of greenhouses, racks, racks. The shaped profile has the ability to bend, drill, cut, so that it can be used in the manufacture of the structure.

The aluminum profile frame is light, durable, requires minimal maintenance, and can be reinforced with your own hands.

The greenhouse has a long period of operation (20-25 years). A significant drawback of the greenhouse is that it will be too expensive to build with your own hands.

It occupies a leading position in the market. Products from it are durable, convenient, cheap.

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Greenhouses that use a curved profile

When building an arched greenhouse, the profile must be bent.

The profile will need to be bent during the multifunctional construction process. It will be necessary to bend the profile for an arch that extends vertically upwards from the base and is bent in the middle. In a frame is used, the strength of which can be ensured by the connection of racks and beams. The domed greenhouse has a polygonal frame construction (metal or aluminum) and is difficult to assemble by hand. Whole frame material should be selected based on, as well as its size.

When building arched greenhouses, it is necessary to prepare 12 flexible rods for semi-arcs. Their length should be 1.5 m. For high greenhouse(1.8 m high) you will need to prepare 10 rods that have a diameter of 30 mm and a length of 2.9 m.

The creation of the frame begins with the definition of holes for flexible rods. They are drilled, after which the support racks are prepared. When installing the main frame with your own hands, it may be necessary to carefully bend the metal rods in an arc.

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How can I bend a square tube for a polycarbonate greenhouse arc?

In order to bend the pipe, you can use a homemade pipe bender.

With polycarbonate, there is a need to bend a square pipe with an arc, which has a cross section of 20x20 mm. The diameter between their ends is 3 m.

Tools will need to be prepared in advance:

• ruler;
• bending machine;
• pipes for bending (profile);
• Bulgarian;
• pencil;
• welding.

The pipe can bend bending machine which is made by hand. The machine is scrolled by the handle, but the work requires more effort if its wall is 1-2 mm. Without using a machine, you can bend by hand using parallel pipes, and you will need to first fasten them together. An arc of the corresponding radius is drawn on the ground. A curved product should be attached to it, bent so that the original fully complies with the drawn drawing. The second arc bends similarly to the first.

The pipe is pre-divided into several equal intervals, filed with a grinder and then bent according to the existing template. Places of cuts are processed by spot welding.

The profile is light and durable, it connects well with absolutely any plane, withstands large transverse loads.

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Profile bending with a machine

The service life of a greenhouse from a profile can reach 20-25 years. Therefore, you should take care of the quality assembly of the frame.

The developer who bends the profile knows that this operation is quite complex. It can be made using a factory-made pipe bending machine or made by hand. One possible method for bending a profile is to use a fire source - a propane torch, an acetylene torch, or a blowtorch. One part warms up, after which the lever bends at an angle. Disadvantages of this type of work: great physical effort is required, resulting in an unaesthetic appearance after processing the product.

Profile bending operation pipe bending machine performed more accurately and faster. The profile, with the help of a handle, is pulled along the pipe bender rollers, while the other roller presses on the pipe and deforms it. The pipe bender passes the pipe through itself and makes an arch of the required radius from it. Bending is performed at an angle of 30-180 ° (on pipe benders with hydraulic drive). On a manual pipe bender, pipes can be bent to carry out in the winter time or to install ventilation devices.

Tools you will need to make a pipe bender:

• lead screw;
• 3 rollers;
• blank;
• bracket with clamping axle;
• sample;
• channel;
• steel pipes having a diameter of 70-150 mm;
• welding;
• concrete mortar;
• metal table.

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The process of making a homemade pipe bender

A homemade pipe bender can be made from two pipes and two rollers.

A homemade pipe bender is made from 2 pipes. Their diameter can be from 70 to 150 mm. With help concrete mortar they must be fixed in the slab. They can also be fixed by welding to the channel. Pipes are located at a distance of 600 mm from each other. A pipe is installed between the racks, after which it is bent with force at an angle.

The rollers are placed on axles. They need to be placed on the same level, while the distance between them should be approximately 50 cm. The third roller is located in the center. It must be raised to a level of 100 mm. The jack should raise the roller and adjust the bend radius of the pipe. A homemade pipe bender will bend a rolling profile for the manufacture of a greenhouse or greenhouse structure. A pipe with a thin wall will need to be covered with sand from one end, and then inserted into a pipe bender. After processing, the sand should be removed. The entire length should be the same diameter of the product.

The profile pipe has a different section: oval, round or rectangular. The pipe bender is different from a similar machine for ordinary pipes. The product and the rollers have the same cross section.

During production, the roller is mounted on a metal table. A bracket is attached to the axis, which has a clamping axis. A roller should be installed on the axis, which copies the pipe profile. The workpiece must be fed by hand. When passing, the product will be pressed against the roller. It is pulled several times between the rollers, as a result of which the necessary bend is formed. Finished material attached to the template.