Rollers made of profile pipes: types, operating principles and self-assembly. Do-it-yourself profile pipe bender: drawings and manufacturing tips Drawings of rollers for strengthening a profile pipe

Rollers for profile pipe is a tool that not everyone knows. What is it and what is it needed for?

A little about the profile pipe

Traditional round pipe products are more familiar to the average person. They are used for water supply systems, drainage systems, as cable sheaths and much more. The profile pipe has an unusual shape.

The profile of the pipe product may have different shapes, however, the most popular types are:

• Oval. Products of this profile are found in radiator systems and as elements of decorative structures.
• Square or rectangle. This profile is used in the construction of load-bearing structures. This is explained by the high strength of the products under lateral load. The weight at which a regular pipe bends, a rectangular or profile pipe square shape withstands without changing shape.

Methods for installing load-bearing structures

When installing load-bearing structures, the joining of elements is carried out in two ways:

• By welding. The connection of elements by welding is strong and durable. This is especially important in places where there is a lot of pressure on the connection.
• With bolts. This connection is more profitable, since not everyone has a welding machine. Bolts can be used to connect elements of greenhouses, sheds and shelving.

Load-bearing parts on which a large load is planned are best made using I-beams or channels. These elements are not so beautiful, but have high strength compared to a profile pipe.

Creating curved surfaces

IN load-bearing structures the profile pipe plays the role of a horizontal, vertical or inclined support for balconies, ceilings or roofs. But for canopies, canopies or greenhouses it is necessary to create a curved surface.

This is explained by several reasons:

• Aesthetic perception. Round shapes have a calming effect on vision and the human psyche.
• Wind and precipitation. The streamlined shape does not serve as an obstacle to the wind, so during strong gusts the rounded surface poses virtually no threat. In addition, round shapes do not retain precipitation in the form of rain and snow.

To create a curved surface, you need to bend the material. This action can be performed by heating individual areas with a gas burner.

This is the simplest bending method, but it has some disadvantages:

• Firstly, its implementation requires a large lever, a strong stop of the tubular product and enormous physical effort.
• Secondly, it is impossible to achieve a uniform bend in this way.

You can create an even sector of a circle using rollers.

Types of rollers

To produce a profile pipe and bend it at home and in a factory, completely different tools are required.

Factory production

Rolling– this is the main one technological operation in the process of manufacturing profiled pipe products.

The whole cycle looks like this:

• Flat blanks are rolled into a cylinder, and the joint is welded.
• The resulting product is rolled through rollers, where the desired profile is formed under high pressure.
• The quality of the seams is checked.
• Products are calcined to remove residual stresses from deformation.

To produce large volumes, factories use appropriate equipment. For example, on full rolling mill For a large enterprise, the rollers for a pipe bender weigh several tens of tons, and the force applied to them can reach several hundred tons. At the same time, it does not use a manual drive, but electrically driven equipment.

Home production

Self-made rollers for a pipe bender must meet completely different requirements:

• Ease. The equipment should move without much effort.
• Compactness. IN small room the large dimensions of the machine will only complicate the work process.
• Economical. Powerful electric motors can be used to quickly roll workpieces. However, such electricity consumption requires high costs to pay for it. In addition, to operate such equipment, it is necessary to have appropriate wiring that can withstand high power.

At home, two types of rollers are used: electrically driven (with motors up to 1.5 kW) and manual.

Manual rollers for profile pipes are the simplest option. Such a device consists of three steel rollers, two of which are located on the same horizontal line, and the third roller is lowered between them like a clamp using a screw mechanism. A handle is attached to one of the rollers, lying on the same line, which sets it in motion. The principle of operation of such a mechanism is as simple as its design: a profile pipe is laid on two rollers, it is pressed on top by a third roller, which bends the pipe under pressure. By rotating the handle on one of the rollers, the pipe is rolled through the rollers. The result is an even bend along the entire length.

If you make transverse grooves on homemade rollers for a profile pipe, then you can bend a round, non-profiled pipe.

Do-it-yourself rollers for a profile pipe can be used for the manufacture of elements of greenhouses and canopies in a small volume. For production large quantity Such a device is not suitable for structures.

It is much easier to bend a profile pipe on electrically driven rollers. The pulling and deformation of the pipe is carried out by a simple mechanism consisting of a low-power electric motor and a gearbox. The large gear ratio on the gearbox ensures that the mechanism operates with a low-power motor.

Using various drawings rollers for a profile pipe, you don’t have to look for suitable equipment, but make it yourself.

Bend metal pipes at the desired angle or along a given contour, preferably without loss of strength qualities and internal working sections, occurs quite often. In pipeline systems there is an excellent opportunity to do without unnecessary connecting parts; in structural structures made from profile pipes there is a certain freedom of design and design thought.

We specifically introduced this section in order to slightly cool down the natural fervor of our fellow citizens to do everything with their own hands: artisanal mechanical or hydraulic pipe bender, rollers for it from random metal tubes, and damaged rolled metal - entertainment, of course, worthy for a real man, but it’s easier to look for ready-made profile products that just need to be brought to condition.

For people who are far from such purely mundane topics, let us explain:

Pipe bender – mechanical device, which is capable of bending pipes of any size and configuration. There are only three industrial versions of the drive type:

• manual: the simplest in principle of operation and the most complex in operation; the final deflection pattern of the pipe can be changed, but the physical effort to perform shaping work remains equally large;
• hydraulic: a version of a semi-professional pipe bender with rollers made of alloy steel, which allows you to roll pipe profiles up to 80 mm without losing the strength properties of the pipe, crushing and stretching the working section;
• electromechanical: industrial machine tool production, which produces most ready-made structures from rolled pipes.

The rollers of a pipe bender are simply two round shafts made of high-strength material, between which the material being processed (in our case, an ordinary steel pipe) is “rolled” and takes a given shape.

Make a pipe bender yourself or buy a ready-made one

The question is funny because it touches on two absolutely different areas: financial and psychological. For many of our compatriots, it’s easier to buy a ready-made pipe bender, not have to worry about calculating rollers and loads, but simply take the instructions and quickly bend all the pipes that are available on a suburban site.

Most important question The thing that always comes up when purchasing expensive equipment is the price. For reference, let us inform you: a high-quality hydraulic pipe bender costs in the range of 22-35 thousand rubles. Perhaps your entire structure, built from bent profile pipes (shed, garage, summer cuisine) are priced cheaper. A manual pipe bending device with six bending profiles and a jack rod will cost 9,500-12,000 rubles.

Agree, if you do not plan to build up all your land with openwork greenhouses and gazebos of complex architectural forms, then such expenses for equipment are clearly unnecessary. Our natural intelligence begins to work and, as a result, the traditional Russian answer: we’ll do it ourselves.

How to make a pipe bender for a profile pipe with your own hands

We considered the entire range of profile steel pipes, their structural advantages and scope of application separately. Now we will try to bend them with our own hands along a given radius of the final product.

It is very important to avoid the following technical defects:

• cracking; such metallic profile will have to be thrown away;
• compression or tension of surfaces at points of potential load on a structural element;
• deformation of the original profile, leading to a violation of the resistance of the metal (corrosion and mechanical) in the bending and fracture units of the supporting structure.

If you are ready to make a unit and rollers for such work with your own hands, honor and praise to you. The simplest homemade pipe bender with electrically driven rolling rollers (any electric motor with a gearbox will do) and a clamping device made from an ordinary steel pipe. It is mounted on a regular car jack and, judging by the reviews, produces high-quality arched products.

We appreciate the technical discoveries of our “Kulibins”, but we recommend buying ready-made rolled metal of any configuration or making it to order according to your drawings and ideas, without particularly straining your hands and head.

The emergence of cellular polycarbonate for the manufacture of greenhouses determined new type structures of protected ground structures - arched structures. To create a metal frame for such buildings, you need to have a machine capable of bending structural profiles along a certain curve. Homemade rollers for profile pipes are designed to help in the manufacture of arches along a given radius.

Technological process profiling of long workpieces is based on pulling the part through rollers located at a certain distance from each other. To give a bend in one direction or another, the length of the length is not passed in a straight direction, one or two rollers are offset.

Pipe rolling machine

When rolling long pipes on a machine, the center of movement is shifted. Due to this displacement, a curve is formed between the rollers. One roller presses from the inside of the radial contour, and the other two form the external contour of the future product.

Drawing of a pipe bender for pulling profile pipes. All dimensions of parts required for manufacturing are indicated:

Structurally, such a device is made on a strong support made of channel. The lower rollers are located in bearings. Usually the distance between them does not change (there are variants of the machine where, by changing the location of the lower rollers, a different rolling radius is created).

The top roller is located on top. It can be moved in height. By moving the supporting part downward along the thread, significant forces can be developed. They will act on the pipe during the rolling process.

To perform rolling, additional pulling forces must be applied in the longitudinal direction. A handle is installed for this purpose. By rotating it, you can make the pipe move in one direction or another.

For self-production, you can go a different route. The walls of the device are cut out of a sheet 2...4 mm thick, where the rollers are installed.

Simplified pipe bender design:

The most difficult thing is to make the sidewalls, inside of which are located:

1. Support shafts – 2 pcs.
2. A pressure roller located on a suitable device.
3. A handle that allows you to roll a profile pipe.

Industrial machines are made with manual or electrically driven. When manufacturing an electrified machine, the possibility of reverse must be provided. Then you can roll, forcing the length to move in both directions.

Making a pipe bender with your own hands

The simplest pipe bender It is relatively easy to make. Need to purchase:

• bearings No. 206;
• bearing housings;
• shafts Ø 35 mm made of hardened steel HRC 40…45 (suitable for inner size bearings);
• bicycle sprockets of the same diameter;
• bicycle pedal;
• lead screw with nut;
• channel No. 8;
• channel No. 6;
• M8 bolts with nuts;
• strip 40 mm, thickness 4 mm.

To make it you need to use:

1. Electric drill.
2. File.
3. Angle grinder with cutting and cleaning discs.
4. Welding machine.
5. Set of wrenches.

Step-by-step manufacturing of the machine

Having prepared a set of components, we begin manufacturing.

General form machine It is installed on timber 100·50 mm.

All details are displayed in a visible place. The performance of the bearings and lead screw is preliminarily checked.

Blanks are cut from channels. They are welded vertical stand, installed perpendicular to the supporting channel.

A hole is drilled for the lead screw. A nut is welded to it. Then screw in the screw. A cross member is welded on top; it will be needed to move the screw along the thread.

Bearings move along the support channel. They are pre-installed in the housings. Shafts are inserted inside. Chain sprockets are welded to one of the ends.

A bicycle pedal is welded to one support shaft. By rotating it in one direction or another, you can force the pipe to move in the desired direction.

Having manufactured the clamping mechanism, the location of all elements is checked. They try to install them according to the drawing presented earlier.

Having installed the parts in place, they are welded. Now it’s time to check the functionality of the device.

Place the pipe and roll it in both directions. There is no pressure from above yet; we are checking how easily the pipe moves.

By turning the screw, press the pressure roller down and push the pipe. By moving the pressure roller, roll the pipe. After each pass, move the roller down. Periodically remove the part and compare it with the template.

Having manufactured the machine, you can begin to manufacture greenhouses and greenhouses, which are based on profile pipes. Below are examples and information on how to make such structures.

Video: homemade pipe bender for profile pipe.

Arches for greenhouses and greenhouses

Different types greenhouses are used in the practice of gardeners

Greenhouse metal frame 3·4 m:

Most often, three-meter arcs are chosen. An entrance is created at the ends. Additionally, a window is installed that can be opened while leaving the door closed. Profile pipes of 20·20 and 25·25 mm are used.

Reinforced arc of an arched greenhouse:

IN winter period the load can reach over 200 kg/m². Therefore, a curved arc inside is welded to the outer contour. Additionally, radial connections are welded. Now a more rigid circuit is working that will withstand high loads.

Stationary greenhouse “Butterfly”:

Small designs greenhouses can be made stationary and portable. They are convenient because you don’t need to go inside to work with the plants being grown. It is enough to open the doors slightly to gain access. The greenhouses are called “Butterfly” because they open in both directions. From the end, the raised doors look like butterfly wings.

Greenhouse "Breadbox":

In the beds for the spring and autumn periods they install portable greenhouses"Breadbox". In this design, the door opens in a similar way to how this issue is resolved in bread bins. It rises up and moves along the back wall. Such devices are in enviable demand among vegetable growers.

Greenhouse "Droplet":

The desire to reduce snow load and create a durable metal frame encourages designers to create drop-shaped greenhouses. The generatrices of the walls are built along complex curves. The top is pointed, the snow rolls down without stopping on the surface.

Joining semi-arches in the “Droplet” greenhouse:

Inside, the semi-arches are connected in the center of the frame. This solution facilitates the production and delivery of products to the gardener’s plot. All that remains is to make the halves and assemble them on site.

When constructing greenhouses, designers count on the length of rolled products, as well as polycarbonate rolls. Standard length profile pipes is 6 m. You can bend them different ways. But the condition remains that there should be a distance of 3 m between the ends of the pipes.

Drawing of a radial arch for a greenhouse made of 20·20 mm profile pipe. Doorway:

The most common design is made along a radius of 1500 mm (outer profile). In it, a height of 2115 mm is reached in the center of the structure. Vertical sections are created on the sides of the generative arc; their length is 615 mm. Users will enter through a 780mm wide doorway. The opening height of 1830 mm is sufficient for the passage of people of average height.

Practice shows that such a greenhouse is in demand in most areas. There is enough space inside to accommodate beds and walkways.

Arch for a heifer 2800 mm wide:

Some people like to use a greenhouse that has a slightly smaller width (2800 mm). In it, the height in the central part is slightly higher, amounting to 2195 mm. Here the vertical sections along the edges have a height of 795 mm. The radius of the generating curve is 1400 mm ( outer size).

The large height (2085 mm) and width (800 mm) of the doorway attracts attention. Even tall users will be able to walk inside freely without bending over when entering.

For a greenhouse 6 m long you need:

• 7 arcs, they are placed at a distance of 1 m from each other;
• for the manufacture of end elements, 33.3 m is required;
• the longitudinal elements between the arcs will total 42 m;
• To manufacture a metal frame, 20 profile pipes (6 m) will be required. The calculation was performed for a 20·20 mm profile pipe with a wall thickness of 1.5 mm. The total weight is 99 kg.

Arch for a greenhouse type "Pavilion":

When manufacturing a “Pavilion” type structure, a reinforced arc is created. Distance between vertical supports will be 5400 mm. Profile pipes of 40·60 mm (2 mm wall) are used. Pipes of 40·40 mm are used as supports (you can also bigger size in the manufacture of carports).

Reinforcement is necessary so that such an arch can withstand a snow load in winter equal to 200...220 kg/m². They are placed at a distance of 1 m and covered with cellular polycarbonate 6...8 mm thick. For winter greenhouses use polycarbonate with a thickness of 10 mm.

Drawing of a small-sized greenhouse bread box:

Using a machine for rolling profile pipes, you can make for yourself and to order a wide variety of arcs for greenhouses and greenhouses.

From this article you will learn how to assemble a pipe bending machine yourself. Also in the article you will find information on how to make a pipe bender with your own hands, videos and drawings with comments on the assembly and use of the machine. We will talk about the nuances of installation and share secrets.

Pipe bending machines are necessary not only for professional work, but also for home work. Bends of pipes along a large radius are especially relevant - they are used to make the ribs of the frames of greenhouses, canopies, and hotbeds. About how to do simple machines for bending pipes, we will tell you in this article.

What is the difference between bending round and profile pipes

Straight and round pipes initially have different purposes- round for water supply (sometimes poles), straight for the frame. Therefore, they have different requirements for the tightness and safety of the wall - round pipe should preserve the properties as much as possible. In this regard, thrust wheels and mandrels always have a groove of a certain diameter. Wheels and headstocks for profile pipes have either a rectangular groove or a “tooth” along the entire circumference. It crushes the pipe wall inward and thereby maintains the cross-sectional dimensions. This is relevant because the straight profile is bent under a small radius, mainly in order to obtain decorative elements of the so-called “cold forging”.

DIY profile pipe bender on rollers

Home homemade version This machine is schematically taken from factory models. The design is simplified as much as possible and is within the power of a novice master. According to the principle of operation, roller machines are divided into two main types - with press rollers and with a lifting platform (platforms). In this case, the main structure is almost the same, the only difference is which element will determine the radius of the arch. We will look at a simple design with a lifting platform.

1, 3 - channel; 2 - racks; 4 - rollers; 5 - loop; 6 - jack

To create the machine, you will need three pairs of bearings with a seat diameter of at least 30 mm - this will be the basis of the rollers. Also, the shafts themselves should be selected for them so that they fit into the bearings (scrap, wheel, factory shafts, automotive parts). The rest of the material - channel, 10 mm steel plate, angle - can be varied depending on available supplies.

Completing of the work:

1. Take a reliable base, for example, a thick-walled channel 100-150 mm long 800 mm.
2. From the same channel you need to make platforms - two sections of 300 mm each.
3. 500 mm from one of the sides we vertically weld a central post 350 mm high from square pipe or a paired channel.
4. From above, strictly horizontally, we weld a fixed platform and a rear pillar to it.
5. We increase the walls from the profile pipe to a height of 120 mm. The height must be maintained in such a way that the size in the drawing is no less than maximum thickness pipe that is to be bent.
6. To create a moving platform you need to make a loop. We select a pipe and a “finger” so that it fits into it without play. We cut the pipe to the width of the channel and divide it into three parts. We weld the two outer ones to the frame, and the third (middle) to a 300 mm section of channel. We mount the connection “on the finger”.
7. We weld bearings to both parts of the platform 50 mm from the edge on both sides, as well as on the extended walls. Reinforce with corners.

Attention! Make sure the bearings are aligned - misalignment will not allow you to install the shaft.

1. We install the rollers in the bearings. We mount a removable crank on the middle roller, for example, a bicycle pedal.
2. At the end of the moving platform, you need to install a regulating mechanism. Ideally, a hydraulic jack, but you can get by with a threaded one (rod from the machine, leg from the scaffolding). The lift is also secured to the base with bolts.
3. If desired, legs can be welded to the base for mounting on bolts.

Home pipe bender, video

Hydraulic profile pipe bender for small radii

The three-point machine differs from other types of pipe benders not so much in the drive (hydraulics), but in the way the force is applied. The principle of operation of this device is extremely simple - a section of pipe, fixed with a stop at two points, is pressed in the middle (at the third point) by a radial mandrel with a groove, gradually taking its shape.

This pipe bender is convenient because it can be mounted on a movable platform with wheels for transportation. The platform will be needed in any case, since the force directed to the mandrel will need to be compensated by the stop. Pressure of this force can be applied using a mechanical (threaded) or hydraulic jack.

To make a pipe bender you will need the following materials:

1. Steel plates 10 mm with dimensions 600x150 mm - 2 pcs., 300x80 - 1 pc.
2. Strip or cut from a plate 6-10 mm long 450 mm - 4 pcs.
3. Bolts with nuts Ø 10 mm and 20 mm.
4. Tension springs 200 mm.

Tool:

1. Welding and plumbing - a powerful grinder, welding machine, drill from 850 W (machine).
2. Measuring and marking - tape measure, squares, marker, center punch.
3. Consumables— metal cutting and grinding discs, metal drills 6, 10 and 16 mm.

The machine will consist of a spatially rigid frame and a removable car jack. The main advantage of the collapsible machine is the ability to use the jack separately - there is no need to purchase it specifically for the pipe bender. In principle, the power drive can be a diesel internal combustion engine. Its main task is to produce sufficient force to overcome the resistance of the pipe.

Frame making

The frame consists of two mirror elements - frame walls - and a heel on which the jack will be installed. Structural elements are arranged according to the drawing.

1 - bolts; 2 - jack; 3 - mandrel

The work plate is marked from vertical axis(if the frame is vertical). The first lower holes are located 40 mm from the edge and 75 mm from the axis. The axes of the outer holes are 25 mm from the outer edge. Having marked the first and outer holes of the wing in this way, you can build an axis of intermediate holes, then divide it into equal segments. The intersections of the marks and the inclined axis will be the axes of the holes.

It is better to drill holes Ø 22 mm in several approaches, gradually increasing the diameter (for example, Ø 6, Ø 10, Ø 18, Ø 22). This is especially true if there is no drilling machine, but only a drill.

Attention! Remember that the larger the diameter, the lower the drill rotation speed and the stronger the pressure.

The mirror plate is made in a similar way. The lower thrust plate should be marked evenly along the axes and the locations of the mounting holes for the jack should be identified. The heel of the jack always has standard mounting holes.

The height of the structure is determined by the dimensions of the existing jack and the distance from the bottom of the mandrel groove to the contact surface of the thrust roller (headstock) strictly vertically (dimension a in the drawing). Distance a should be approximately 20 mm with the jack rod fully retracted (no load). This is necessary to install a pipe of minimum diameter (15-16 mm).

Free corners (shaded in yellow) can be cut off. All edges and ends should be sanded with a grinder, preferably then passed with a “petal” disc.

Machine assembly

The distance between the mirror plates should be several millimeters greater than the maximum diameter of the pipe to be bent. For the machine of this type the optimal maximum is 50 mm. Total between the plates is 53-55 mm. The thrust rollers must be the exact size (height of the cylinder) and should be installed first before welding. Having determined the location of the steel strips on the heel, we weld the structure together.

Then, in the lower third, we determine the optimal position of the intermediate shelf and attach a return spring to it. The fastening of the spring to the jack rod is selected individually, based on the design of the jack and available means.

Special elements

There is one nuance in a three-point pipe bender - one part cannot be made at home and you will have to turn to a turner or buy it. This is a mandrel. Manufacturing one mandrel costs from 10 to 25 USD. e. depending on the size and complexity. The price of mandrels in the store is from 20 USD. e.

The thrust rollers are also worthy of special mention. They can be a powerful steel bushing for a 20 mm axle (bolt). Along the outer plane, you can weld homemade mandrels for the main diameters - 25, 32, 38 and 50 mm or profiles. A mandrel for the thrust roller can be made by cutting it out of a larger diameter pipe and straightening it with a hammer.

Simplified machine options

For a large volume of work with thin (16-25 mm) pipes, as well as thin-walled ones (copper, aluminum, stainless steel), you can assemble a simple version of the described machine from literally several strips of metal. Such a machine will be many times lighter, but the range of workpiece diameters is limited. The main difference is that the holes are located in a row perpendicular to the jack rod.

If a hydraulic jack is not available, you can replace it with a threaded one, mounting it in place in the thrust heel of the frame. To do this, you need to burn a hole in it and weld a nut under the threaded rod, similar to how a pipe bender is made, the video of which is located below.

Manual three-point pipe bender with threaded jack on video

The convenience of the design lies in the fact that it can be completely modified while maintaining the basic principle of three contact points. As a result, you can get the same pipe bender, but from different materials. In a stationary version it may look like this:

Watch the video for vertical three-point pipe bender

The pinnacle of convenience and technology, without a doubt, will be a hydraulic jack with electric drive. This " aerobatics» home handyman, but quite possible variant with developed skills and access to a turning shop. Such models are on sale.

In order to assemble a pipe bender with your own hands, it is not so much the drawings that are important, but the availability of tools and available materials - metal, wheels, bearings, etc. Using our advice and your own skills, this is quite within the capabilities of a home craftsman.

Profile pipe is an element of many building structures and frames. Used in the construction of industrial and residential buildings. The main characteristic that distinguishes it from other types of pipes is the non-round shape of the cut. A profile pipe is produced from a sheet, welded and bent lengthwise in in the required form. If necessary, you can make rollers for a profile pipe with your own hands - you will find drawings and explanations in this article.

Manufacturing of profile pipes using the rolling method

Assortment of profile pipes

In the factory, two methods are used for the production of profile pipes from metal sheet:

• hot method, in which a straight-seam round pipe is heated;
• cold method, in which rollers for a profile pipe are rolled over unheated metal.

The basis for production is carbon, low-alloy, and less often stainless steel. Modern factory equipment will allow you to obtain a profile with high accuracy seams and bends, since the process is controlled by transmitting data from a computer and receiving it from sensors that take readings with an accuracy of thousandths of a millimeter. Homemade rollers for profile pipes cannot provide such detail, but they cope with the task of producing elements for home construction and household work. This technique is used to produce consumable elements for fences and canopies, greenhouses and technical buildings, gutters and cable ducts. It is not recommended to make a profile pipe for large-scale buildings at home. Factory equipment allows us to subject each manufactured element to test tests and check both the quality of the seam and the accuracy of the profile calibration. The absence of such equipment does not give the master the opportunity to guarantee the quality of a homemade product.

Assembly of a machine for profile production

Application of curved profile pipes

A do-it-yourself rolling machine for a profile pipe looks similar to a design for bending pipes. It consists of the following elements:

• supporting frame;
• roller system;
• pressing mold:
• stop and levers for activating the rolling mechanism.

In fact, these are two different mechanisms and only the frame can be similar. All structural elements are assembled from durable elements and welded: any defects and negligence can result in work injury. The machine itself is firmly fixed to the surface.

It is almost impossible to provide the required pressure manually: it is advisable to equip the press for creating a profile pipe with an electric drive.

In the machine for shaping the profile about round shape the main thing is a press that twists a sheet of metal. This kind of pressure only gives robust design: The pipe must be held motionless throughout the welding period. To simplify the work, the metal is heated and then rolled. After welding, the round pipe is checked for the quality of the connection: an insufficiently smooth and clean seam will separate when rolling of the profile pipe from a round shape to a rectangular or square one begins.

Workpiece processing process

The finished straight-seam pipe is rolled hot or cold. At home, it is difficult to organize hot rolling, so the process is often carried out on already cooled metal.

The pipe is placed under a press of rollers, forming the required shape.

Rolling is carried out gradually with a decrease in the distance between the upper and lower rollers. Sudden pressure will cause internal folds in the metal, which will affect the strength of the knees. The last rolling achieves the planned diameter and cut contour.

The pipe is checked for cracks and metal deformation in the bend area after each rolling. Zone special attention– the seam area, it is the most vulnerable.

After processing with rollers, the pipe is calcined: this measure eliminates the stress of the metal layers and increases the strength of the structure as a whole.

Bending of profile pipes

Masters rarely decide to self-production profile pipe, preferring to purchase ready-made factory-produced material. The profile pipe is an inexpensive consumable element, so bending is necessary with my own hands No. A machine for bending profile pipes with your own hands is a more popular equipment, since the element is sold in direct form, and ordering bending according to your own drawings is an expensive service. A curved or rounded profile is used for construction and construction decorative elements as more aesthetic. Frames and cornices, greenhouse arches and gate arches can be made with your own hands. The simplest rollers for bending a profile pipe are assembled in a few hours. They will not provide industrial volumes and accuracy, but production costs individual elements will be cut.

Bending quality requirements

The simplest way bending of profile pipes - glow and pressure. In this way, you can even create an acute angle, but you should not count on the accuracy and strength of the knot. Folds on inner surface knees and cracks on the outside are guaranteed. Bending without defects is achieved only by gradually rolling the pipe on rollers and calculating the minimum diameter. The maximum bend angle is not standardized, the minimum is limited by safety requirements. A standard factory machine for bending profile pipes sets minimum diameters rounded bend, you can focus on the same indicators when creating homemade machine:

• pipes 20x20x2, 25x25x2, 15x15x1.5 - 56 cm;
• pipes 30x30x2 – 65 cm
• pipes 40x20x2 - 65 cm;
• pipes 40x40x2 – 180 cm;
• pipes 50x25x2 - 80 cm.

Machine drawings for home use

The simplest deformable structure can be assembled right in the yard or technical room, securing all the elements on a thick shield or directly on the fence. Elementary models will help out if you need to bend several pipes into a single shape, for example, to install the upper arches of a greenhouse. Regardless of the selected bend diameter and the size of the pipe itself, you will need:

1. A frame that follows the contour of the required arch. It is cut from a single piece of wood or assembled from a series of planks. The pipe will bend according to this stencil.
2. Support on one side of the frame. The gap between the stop and the stencil is made corresponding to the diameter of the pipe being processed. A smaller one will make it difficult to install the element into the device, a larger one will not secure the knee firmly.
3. A block with which the pipe is manually pressed against the template.

Working with such a pipe bender is difficult: all efforts will have to be done manually. But the design will ensure accuracy when bending: you can make several elements with an identical angle of deformation on it.

The pipe bender for permanent use is assembled on a durable U-shaped frame. The following elements are required in his system:

• two rotating shafts mounted on a rail, along which the profile will pass during rolling;
• an extrusion shaft located above them, which presses the profile during rolling;
• a clamp or jack that provides pressure;
• a chain with which the set of rollers will move.

To assemble rollers for a profile pipe with your own hands, you will need a welding machine and skills engineering work. Inaccuracies in calculating the diameter of the functional shafts will make the device inoperable.

Video: working with a manual profile bender

Assembling a bending device with your own hands is a complex, time-consuming and expensive process. Against the background of moderate prices for equipment, it is worth thinking about the rationality of the purchase. Perhaps, to bend several elements, it is more profitable to contact a workshop, but for permanent job purchase a factory model with a quality guarantee.