How to bend a square metal profile 15. How to bend a profile pipe for a greenhouse: the simplest methods and rules for making blanks. Bending the pipe with a metal spring

BEND, bend, bend, sover. (to bend). 1. what. Make curved, bent, hunch, twist. Bend the wire. Bend your back with a wheel (see wheel). 2. whom what. Make hunched, deprive a straight camp. The years have bent him. 3. trans., whom ... ... Explanatory Dictionary of Ushakov

bend- Bend into a ram's horn to humble oppression, severity. I will bend you into a ram's horn. To bend someone (colloquial) into an arc, forcing, oppressing, leading to complete obedience. He has already bent a single one. Bend into three deaths 1) ... ... Phraseological dictionary of the Russian language

1. bend 2. see bend. 3. see incline. 4. see subdue the Dictionary of synonyms of the Russian language. Practical guide. M.: Russian language. Z. E. Alexandrova. 2011 ... Synonym dictionary

BEND (XIA) see bend, Xia. Explanatory dictionary of Ozhegov. S.I. Ozhegov, N.Yu. Shvedova. 1949 1992 ... Explanatory dictionary of Ozhegov

bend- wildebeest /, bend; bent; bend, ah, oh; St. see also bend, bend, bend, bend 1) what to give to something. arched, curved shape; bend down, bend down. Bend / bend the wire ... Dictionary of many expressions

Owls. transition see bend Explanatory Dictionary of Ephraim. T. F. Efremova. 2000... Modern explanatory dictionary of the Russian language Efremova

Bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, bend, … … Word forms

Unbend… Antonym Dictionary

bend- bend, uh, no ... Russian spelling dictionary

bend- (I), bend / (s), bend (s), gnu / t (s) ... Spelling Dictionary of the Russian Language

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Application "Animals of hot countries", . In this book you will find four applications with African animals. You can make a lion, an elephant, a gazelle and a crocodile. The elements of these applications must not only be glued, but also bent. At…

The need to bend profile pipes in everyday life is not often encountered. This task is most often faced by owners of summer cottages or private houses - people who are used to doing everything with their own hands.

Regardless of the shape of the pipe profile, the essence of the bending process is to give the product a partial or complete bend. This can be achieved only by applying a certain external influence - exclusively pressure or a combination of heating and pressure.

From the point of view of physics, in the process of bending, two oppositely directed forces simultaneously act on the profile pipe:

Stretching force. Appears from the outside of the bend.
Compression force. Directed to the inner part of the bent section.

The opposite direction of these forces is precisely responsible for some of the difficulties that often arise in the process of pipe bending:

Different sections of the pipe in the bending zone may change shape unequally, which will inevitably lead to misalignment.
The pipe wall on the outside of the bend may lose strength or even burst under strong tension.
On inside bending, on the contrary, in the process of compression, folds often form.

To avoid these troubles, and not get a crumpled pipe instead of an evenly curved pipe metal surface, you should certainly take into account the type of material and the numerous geometric parameters of the product: wall thickness, cross-sectional diameter, bending radius. Knowing these characteristics will allow you to choose the best way to bend.

Note! Experts say that it is better not to bend profile pipes with a wall thickness of less than 2 mm. The strength at the bend points will be quite low, even with perfect adherence to technology. For such pipes, it is better to prefer welded joints.

The principle of using a pipe bender

It is far from always possible to bend a profile pipe (especially for large-diameter products) with your own hands. For these purposes, there are special devices - pipe benders. A standard pipe bender is equipped with a drive wheel, which, moving along one of the edges, gently bends the pipe section in the required direction.

With the question of how to bend a profile pipe at home, almost all summer residents and owners of private houses have to face. Arcs from a profile pipe are used in the construction of greenhouses, gazebos, canopies and arched canopies. Acquiring or making them with your own hands is economically unprofitable. They are needed for mass, not for single production. Consider what methods exist for giving profile pipes a bend of the desired radius.

The essence of this process is that one side of the pipe is subjected to stretching, and inner part shrinks. Pressure is applied to the workpiece, which may be accompanied by heating, to make the metal more pliable.

Do-it-yourself bending of a profile pipe along the radius is associated with such difficulties:

displacement of the longitudinal axes and planes of the part, which leads to skew;
rupture and the appearance of cracks on the outer part of the workpiece under the influence of the rupture force;
uneven compression of the inner part, leading to the effect of corrugations;
change in the diameter or shape of the workpiece.

To know how to give steel pipes arch shape, a number of factors must be taken into account.

The influence of the material on the choice of bending method

Profile pipes are made in accordance with the requirements of GOST 54157-2010 and have certain properties.

It is necessary to bend the profile pipes taking into account the following parameters:

Minimum bending radius facing material, which is planned to be laid on the arches. At cellular polycarbonate these figures depend on the thickness and structure.
Profile size and wall thickness. Products with a wall height of up to 10 mm can be bent using muscle strength. Profiles from 20 × 40 mm and more, you need to bend in a complex way, by pressure and heating or on a machine.
Elasticity (plastic moment of resistance). It must be included in preliminary calculations, giving the workpiece a smaller bending radius.

Based on the analysis of these data, a choice is made of the method for performing the task.

Bending methods and bending devices

Using improvised tools and household tools, you can make a bending fixture at no additional cost.

As for professional devices, their cost can be several times higher than the price of the material for the manufacture of arches.

Consider the ways in which you can make bent rectangular arches of an ideal shape.

Cold

Without heating, cold rolled products are bent if the master's muscular strength is sufficient for this procedure. As a rule, these are square pipes with a section of 10 × 10 mm and rectangular pipes of 10 × 20 mm.

If the walls of the blanks are thick, then the filling of the internal cavity with resistance is not carried out. Consider the main options for creating arches from metal blanks.

Lever with nozzle

First, a pattern is made with a certain semicircle length corresponding to the specified parameters. They make it from chipboard, plywood, drywall or boards.

After that you need:

firmly fix the vise on a heavy and stable table. In a vice, a pipe segment with a larger size than that of the workpiece is firmly fixed;
perform bending in several stages by inserting a profile hole of a segment clamped in a vice and applying force to it.

A lever of sufficient length is placed on the bent fragment to create the right pressure for metal deformation. In the course of work, the curvature is controlled by a pattern.

By mandrel

The mandrel is made on a solid base, which is a concrete or asphalt platform, a large workbench. In fact, this is a special template, along the contours of which the profile pipe will bend.

Given the degree of elasticity of the metal, the master needs to give the mandrel a smaller radius.

The procedure is carried out in the following sequence:

the part is securely fixed on the base;
the end of the workpiece is screwed to one of its edges with wire or clamps;
the profile is bent until the desired shape is given to it.

The template can be replaced with reinforcement driven into the ground. As the pipe deforms, it is sequentially welded to the pins. After finishing work, the arch is cut off from the stoppers.

With the use of internal countermeasures (sand, water)

This method is used when the profile parameters are less than: height 10 mm, width 20 mm, wall thickness 1 mm. Pipes filled with a dense substance retain their shape better, even with strong pressure on a small area of \u200b\u200bthe product.

The use of sand and water guarantees a quality result without marriage. And this factor is important, given the cost of rolled steel.

The filler must fill the cavity of the profile pipe throughout the entire volume. It is much easier to achieve this with a liquid. The sand is compacted by vibration and spilled with water. Holes on both sides are welded or tightly clogged with wooden plugs. If heating is used, it is important to leave one of the sides not clogged for the release of gases.

Cutting with a grinder and welding (sector welding)

Cutting with a grinder and welding does not require significant effort. The master needs to be prepared for the fact that this event will take a long time. The advantage of this technology is that there is no possibility of damage to the profile, its shape can be adjusted throughout the entire bending process.

The work is carried out in the following sequence:

A scheme is being drawn up. It shows the distance between the cuts and their configuration.
Marking is applied to the profile. Triangular cuts are made along it with a grinder. The incised fragments are removed.
The workpiece is bent. If the metal is elastic and unbends after compression, then the joints are immediately fixed by spot welding.
The gaps remaining after compression are welded or sealed. After the metal has cooled, the seams are ground and painted over.
The edges on the arch are almost invisible. When laying polycarbonate, small differences are compensated by a thick sealant.

Hot

Pre-heating is carried out in cases where the profile pipe has a large cross section or thin walls. That is, it is either impossible to manually bend it, or it is fraught with damage or breakage of the workpiece. Let us dwell on the techniques that are used for thermal bending of rolled steel.

Using a spring and a blowtorch

The spring is needed in order to prevent the profile walls from being forced through during their bending. In addition, the elastic insert will give the finished product a neat and even shape. It must be strong enough to take on and withstand the pressure exerted on the profile.

The section at one end is rigidly fixed in the ground or in a vice. Before bending the fragment, it is heated until the metal turns red.

You can only cool the bent place with warm engine oil - iron cracks and becomes brittle from water.

The use of a spring and a blowtorch saves the worker from applying excessive force.

hot forming

It is possible to give the desired shape to the profile without preliminary internal filling. When heated, the steel becomes so soft and ductile that it can be bent by hand, without the use of levers and complex fixtures.

For this, a convex stop of a semicircular shape is made. It must be made from a material that is resistant to high temperature. A car disk or fireclay brick coated with clay is best suited for this. With a heated place, the part is applied to the template. After that, it bends in one slow and precise movement. After a few minutes, you can continue the procedure.

Giving profile pipes the shape of an arch is a complex process that requires skills in handling household tools and metal.

In the manufacture of arches, the following rules should be followed:

It is easier and more convenient to work with short workpieces. Before bending, it is advisable to cut the parts into segments 1.5-2 meters long. Subsequent welding will not weaken the strength of the finished arch.
Heating of the metal should be done slowly to prevent uneven heating and deformation. The resulting scale must be cleaned off immediately, as it causes corrosion.
Rolled steel must not be exposed to temperatures above + 800 ºС. Such an impact leads to the destruction of the crystal lattice of the metal. The profile becomes soft or brittle.
All bending actions should be performed slowly, gradually increasing the load.

How much does it cost to bend a profile for a greenhouse

The cost of services is determined by the status of the workshop, its geographic location and the equipment used.

The average price for bending profiled steel is (in rubles per running meter):

10×10 - 80;
20×20 - 100;
25×25 - 110;
30 × 30 - 120;
20 × 40 - 125;
20 × 45 - 130;
40 × 40 - 140;
50 × 50 - 150;
60 × 40 - 160;
50 × 50 - 180;
80 × 40 - 240;
80×80 - 360;
100x100 - 480.

The cost may differ depending on the supply and demand market.

Special devices for bending

In order to reach High Quality finished product, you can use.

pipe bender

Pipe benders consist of a frame, several rollers, limiters and a drive. The device is controlled manually, by an electric motor and hydraulic cylinders. In private construction, profile pipes with a wall height of up to 20 mm are used. A manual pipe bender handles their bending.

Conductor

This tool is designed for precise manufacturing and connection of profile joints when cutting with a grinder and connecting arches with vertical, transverse and inclined posts.

Thanks to the use of a jig, the most accurate connection of parts at a right angle and a neat seam between them are achieved.

bending plate

This device is a removable structure that is installed on a workbench or on the workshop floor.

For fastening, embedded parts or anchor bolts are used. The curvature of the base plate is adjusted by bolts.

After the bending is completed, the equipment is removed, and the mortgages are closed with plugs.

Making a bending machine with your own hands

About how to independently assemble a manual pipe bender, we already

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 a profile pipe at home. After all, such a need arises often.

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

in a specialized workshop.
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 professional craftsmen who 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 the profile assortment of the following form:

square;
rectangular;
oval, etc.

This is due to the fact that round types are placed in the design of a pipeline for supplying 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 minimum angle for bending rolled metal, in 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.

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.
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.
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.
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.
By using physical force. 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. When working, it is necessary to control cross section not flattened and there were no internal fractures.

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 your own hands a professional pipe by 20 is a profile bending machine, on the top 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 the optimal space for installing the element for fixing. 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 way how to bend a professional pipe yourself without a pipe bender that you can use House master, has its 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

Such devices use manual drives, but if you develop the design further, it may well be the starting point for developing your 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 line of business development, since it involves the use of rather complex technological equipment in the industrial version.

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 linear meter of an 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

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 a 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.

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.
Gears and chain are suitable for any machine. Parts from a foreign car are of better quality.
Using a welding machine, the base is welded, and the clamp shaft is screwed to it.
Next, weld the spring nuts and a platform for them.
Screw the support shafts at the bottom.
A tension chain is being built.
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 simplest pipe benders, after watching the video materials and studying the drawings, you can learn how to bend and pick up correctly best option designs.

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.