Methods and technologies of metal radius bending. Metal bending in a bench vise. Disadvantages of air bending

08.06.2020

It is not difficult to make a bending machine with your own hands, but so far a few home craftsmen and specialists who use bent sheet steel products in their activities are engaged in the manufacture of such equipment for their own needs. Meanwhile, such a device, which has a sufficiently high reliability and ease of operation, will help to save a lot.

One of the most affordable sheet benders is the domestic LGS-26, the price is about 38 thousand rubles. We will make it cheaper and optimize for your needs

Especially the manufacture and use of a bending machine is relevant for those who need to perform technological operations for bending sheet material not daily and in large volumes, but periodically.

Types of sheet benders and their design

Before you start making a homemade manual sheet bender, you should clearly define the list of tasks for which it is necessary. It will depend on the main purpose of such a device according to which scheme it will be executed.

The simplest is a fixture in which sheet metal is bent using a special traverse. By means of such a device, it is possible to easily bend a sheet of metal at an angle of 90 degrees, using only the strength of the hands without additional devices, if the width of the sheet does not exceed 0.5 meters. The base of the sheet is fixed with clamps or in a vice, and its bending is carried out due to the pressure exerted by the traverse. In some cases, to obtain a bend angle of exactly 90 degrees, you may need an embedded spacer (in the figure - on the right), which is an ordinary strip of metal that will help compensate for the elasticity of the sheet.

More complex in design is a press brake, the design of which is a matrix and a punch. Sheet metal in such a device is located on the matrix, and the punch is lowered onto the workpiece from above, giving it the required profile. At home, a press brake is unlikely to find application, as it is quite complicated and unsafe to use.

A version of a home-made press brake working in tandem with. If you already have a press, then it will not be difficult to supplement it with devices for bending narrow sheets of metal. You will get something like this:

A bending machine is much more perfect, in which metal bending is carried out due to the action of three shafts on it. Such equipment is called pass-through. One of its main advantages is that its adjustable rollers allow you to get different bending radii. Such a tool for bending metal can be manually or electrically driven, and its rollers can have a different design.

Rolls with a smooth working surface are designed for most sheet metal work, which involves bending blanks, making sections of pipes with a large diameter, etc.
Profiled rolls are necessary for bending elements of roof structures (ridges, valleys, drains, flanging, etc.).
The broaching bending machine can be additionally equipped with a support, a clamp and a traverse, which allows it to be used for manual bending of workpieces.

Such machines are equipped with a set of shafts of various profiles, which can also be purchased additionally to make the equipment more versatile.

How to start making a bending machine

To make a bending machine sheet metal, you will need a drawing of such a device or its detailed photos. In addition, one should take into account a number of important factors, as the effort that will need to be applied to use the bending machine, its weight and dimensions (on which mobility depends), cost and availability of components. As a result, we obtain the following initial parameters.

The maximum width of the sheet that will need to be bent is 1 m.
The maximum thickness of sheet material: galvanized - 0.6 mm, aluminum - 0.7 mm, copper - 1 mm.
The number of work cycles that will be carried out without readjustment or repair is 1200.
The maximum bending angle of the metal profile, obtained without manual finishing, is 120 degrees.
It is highly undesirable to use workpieces made of special steels (for example, stainless steel).
In the design of the bending machine should be avoided welded joints, poorly transferring alternating loads.
You should limit as much as possible the number of parts of the bending machine that you will need to order on the side, resorting to the help of turners or millers.

It is very difficult to find a drawing of a device that would satisfy all these requirements, but it is possible to refine the most successful of them.

The most popular sheet bender design and its improvement

The design of the manual bending machine shown in drawing No. 1 can be easily improved. According to the above drawing, it can be seen that the sheet metal bending device consists of such elements as:

Drawing No. 1: To build our bending machine, we will apply this scheme

pillow made of wood;
support beam from a channel 100–120 mm;
a cheek, for the manufacture of which a sheet 6–8 mm thick is used;
processed sheet of material;
clamping beam made of corners 60–80 mm, connected by welding;
axis for the rotation of the traverse (made from a metal bar with a diameter of 10 mm);
the traverse itself is a corner with dimensions of 80–100 mm;
handle of the device, made of a bar with a diameter of 10 mm.

At the traverse of the sheet bender (point 7), which, according to the original drawing, is supposed to be made from a corner, a variant of execution from a channel is conventionally shown. Such a modernization will significantly increase the endurance of the traverse, which, when using a corner, will inevitably bend in the middle at a certain moment and stop creating a high-quality sheet fold in this place. Replacing with a channel will allow you to do not 200 bends without straightening or replacing this element (which is very little with more or less active work), but more than 1300.

The design of such a homemade plate bending machine can be further improved, which will make it more efficient and versatile.

Drawing No. 2: The main elements of the sheet bender

Drawing No. 2 allows you to understand in more detail the design of a home-made bending machine:

homemade clamp, made from a suitable corner (40-60 millimeters) and a screw with a heel and a collar;
cheek;
channel, acting as a support beam of the machine;
clamping beam bracket, made from a corner of 110 millimeters;
the clamping beam of the sheet bender itself;
axis of rotation of the traverse;
the traverse itself.

Reinforcing the pressure beam

Below we will consider the scheme of strengthening the clamping bar. However, if you initially have a fairly massive corner as a clamp, and you do not plan to bend excessively thick sheets on your bending machine, then it is quite possible to do without reinforcing the clamping bar in the described way.

In order to extend the service life of the clamping beam and make it comparable to the service life of the traverse, this structural element, which was originally made from a corner according to the drawing, should be supplemented with a base made of a metal strip with dimensions of 16x80 mm. The front edge of this base must be given an angle of 45 degrees in order to align its plane with the plane of the clamping corner itself, and a chamfer of about 2 millimeters should be made directly to the working edge of this element.

In drawing No. 2, the received part in the section is indicated in the additional figure at the top right. These measures will allow the clamping metal to work not in bending (which is highly undesirable), but in compression, thereby multiplying the service life without repair.

An additional 60th angle, welded to the rear flange of the main pressure angle, will keep it from bending up. In drawing No. 2, this is shown in more detail in the additional figure at the top left.

You should also take care of milling the lower plane of the pressure beam, which forms the fold. The unevenness of this plane, according to generally accepted rules, should not exceed half the thickness of the bent workpiece. Otherwise, it will not work to bend the workpiece evenly, without a swollen fold line. It should be borne in mind that the beam should be given for milling only when it already has all the welds, since their implementation leads to a change in the geometric parameters of the structure.

We increase the reliability of machine mounts

There is another big drawback in the bending machine - the scheme for attaching it to the desktop. The clamps that are provided in this device are a very unreliable fastening option, especially if you take into account fatigue welds. Such fasteners can be completely dispensed with, which will also avoid the need for welded joints and cheeks. The following steps allow you to solve this problem:

the manufacture of a support beam that will protrude beyond the desktop;
making U-shaped eyes at the ends of the support beam;
fixing the support beam to the work table with bolts (M10) and shaped nuts with paws.

If there are no cheeks in the improved bending machine, then how to attach a traverse to it? You can solve this issue quite simply: use butterfly door hinges for this, which are usually used for hanging heavy metal doors. To fix such loops, providing a sufficiently high accuracy, you can use screws with a countersunk head. In drawing #2, this is further illustrated at the bottom right.

It is possible to bend many workpieces on a bending machine with a traverse attached to butterfly loops, since these loops are very reliable.

Complete structure

After assembly, an improved device for obtaining a metal profile looks like this:

reinforced support beam;
flywheel - threaded element;
a beam that provides clamping of the workpiece;
clamp for attaching the device to the desktop;
traverse, with the help of which, in fact, you can bend the workpiece.

The drawings show pressure flywheels, which in practice few people have. More often use ordinary screws with welded knobs. After welding the knobs, it is imperative to drive the thread on them, since welding can affect it extremely negatively.

Drawings of another version of the sheet bender

Detailed drawings of a bending machine very similar in design, but differing in the fastening of the traverse. The diagrams show the dimensions, which, of course, can be changed depending on the intended use of the machine.

Support beam Support beam drawing Traverse end face Traverse drawing
Pressure beam Pressure beam drawing General form assy Clamp mount

What is a zig machine and how to make it

A zig machine (or a zigovochny device) allows you to bend stiffener edges on sheet metal products, which are called zigs. Such machines belong to the category of special equipment and can be made with electric or manual drive. Manual zig machines, also fixed with a clamp, can be quite compact in size and carried in a regular bag for working tools.

Such devices make it possible to make high-quality flanging in one pass not only on round products (the same shells of metal containers), but also on straight metal sheets. These devices are simply indispensable in the manufacture of individual parts of roof structures.

The working elements of the zig-machine are rollers, and its use allows you to significantly save on the purchase of factory-produced roofing elements. If you watch a video showing the operation of such a device, it becomes clear that you can use it even at the place of direct installation of the roof structure.

To choose the right fixture for the manufacture of bent sheet metal elements, you can follow the following recommendations.

For a home craftsman who needs a bending machine from time to time, a simple device made from improvised means is quite suitable.
Those who from time to time fulfill orders for the installation of a roof will need manual machine for bending sheet metal and the simplest zig machine.
Professionals who are constantly engaged in the manufacture of elements for roof structures and tin work need a factory device for bending sheet metal.
Manual is useful for those who are professionally engaged in the manufacture of elements of roofing structures. Optimal for such specialists is professional equipment, which is characterized by higher reliability and durability.

Listogib Russian production SKS-2in1, price 64 thousand rubles

If your plans include active use a home-made sheet bender to work on a more or less large flow, then be prepared for the fact that at some point your production may stop due to a breakdown. Since the steel used by home craftsmen for the production of do-it-yourself bending machines, most likely, will not withstand high loads, will quickly get tired and just float.

But for a household, not particularly loaded application, a home bending machine will be an excellent helper and will save a lot of money. It is necessary to take this moment into account and not expect miracles of endurance and performance from a simple home-made machine.

Before making a bending machine with your own hands, you can not only study the numerous drawings of such devices posted on the Internet, but also watch the training video. Perhaps, for some, the size of the described bending machine will seem too small, then you can consider the option of a home-made bending machine of a larger format. Of course, this is no longer a mobile machine, it is suitable for a small private workshop:

Advantages of a homemade sheet bender

Do-it-yourself production of a bending machine or the purchase of a manual through-pass bending machine are often interested in those who want to save a lot on the purchase of mass-produced corrugated board. Simple theoretical arithmetic shows: if you independently bend corrugated board with the help of such a device, then the cost of the latter will be 40% lower compared to the cost of factory products. But not everything is so simple.

If you purchase a factory-run machine for manual type corrugated board with an eye to small-scale own production, then it will cost about 60 thousand rubles. Meanwhile, such a manual sheet bending machine does not guarantee the stable quality of the corrugated board obtained with its help. The problem is that rolling in one pass with big share probability will lead to the appearance of constricted corners, from which cracks can subsequently develop. And rolling one sheet repeatedly, gradually changing the degree of pressure, is too long, laborious and, as a result, unprofitable. But on the other hand, it is quite convenient to make simpler parts from sheet steel with its help.

For a full-fledged Chinese-made rolling line for corrugated board, you will have to pay about $ 20,000. Of course, it consumes a lot of electricity (from 12 kW) and its installation requires a large area, which clearly does not fit into the plans and budget of most home craftsmen.

The most important thing to consider when purchasing a bending machine is the possibility of its quick payback. To achieve this for a master who uses such a device privately is quite difficult. In this case, it is more advisable to use a home-made sheet bender, which is suitable for the manufacture of bent sheet products of any type. With the help of such equipment, it is possible to bend both sheets with standard dimensions and non-standard products, which are in great demand during roofing, as well as many others.

How does a bending machine work

Before wondering how to make a bending machine, you should understand the design features of such equipment. First of all, such devices differ in the type of their drive. So, there are devices with a mechanical, electrical, hydraulic and manual drive.

Mechanically driven bending machines may use a flywheel with a friction clutch and a crank or a system of pulleys, levers and cables with a falling weight. Such devices, characterized by a shock impulse at the beginning of the working stroke, which then gradually weakens, are far from ideal in terms of the quality of the result due to the mechanics of their work and are used less and less.

The efficiency of sheet metal bending equipment, which is equipped with an electric drive, drops markedly with an increase in load in the form of a decrease in the size of the workpiece or an increase in its strength. If you try to bend a hard metal workpiece (for example, stainless steel) on such a bending machine, you may encounter the fact that the rotor of the electric motor will begin to slip, reducing torque and increasing power consumption.

Precisely adjusting the developed force to the resistance of the workpiece allows equipment with a hydraulic drive, but it is not cheap. A conventional hydraulic jack, which can also be used as a drive for bending sheet metal, does not provide an even distribution of force from it along the entire length of the bend.

To summarize all of the above, it turns out that a manual sheet bender is the best option for home craftsmen. It can be made in various designs.

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Bending of steel products with small cross-sectional dimensions is usually carried out in a cold state. The process consists in an irreversible change in the longitudinal or transverse axis of the deformable workpiece.

Types of bending differ in the following parameters:

Bending technology with profiled tool

All the processes considered below are carried out using a specialized tool - stamps. The working parts of any bending die are punch and die. Punch- the movable part of the stamp - is fixed. As a rule, in its upper half, and when moving the slider, it moves back and forth. Matrix- the fixed part of the stamp - is located in its lower half, which is fixed on the equipment table.

The accuracy of stamping with a profiled tool depends on:

When designing the working profile of bending punches and dies, the main factor is not the technological force (for all bending options it is small), but the so-called elastic aftereffect of the workpiece metal, called springback.

As a result of springback, the metal always tends to return to its original shape, and the intensity of this desire depends on the plasticity limit. soft metals(aluminum, copper, steel with up to 0.1% carbon, etc.) spring by 3...8%, and brass, medium and high carbon steels - by 12...15%.

The calculation of springback is carried out according to several options:

Production of punches and dies with a working profile that takes into account future springback(for example, if it is required to bend the workpiece at an angle of 60 0, with the expected springback of the metal 10 0, then the tool profile is made at an angle of 70 0). The springback coefficients are determined according to the tables, depending on the grade of the material and the thickness of the workpiece.
Making punches with undercut where the deformable metal flows. In this case, the forces of elastic aftereffect are neutralized by the force of plastic deformation of the workpiece.
By introducing an additional gauge transition when the product is stamped. The method is unproductive, since it increases the complexity of bending.
Decrease in the rate of deformation and leaving the metal under load for some time, until the inertial forces in the deformable section disappear. This is possible only on hydraulic presses, or presses with a special crank drive.

The wear of the bending tool is uneven: wear out more intensively punches and dies in places of inflection of the original profile, while the resistance of peripheral areas is much higher. However, the tool is subject to restoration or repair (most often, worn areas are welded on and then ground to size).

For bending plastic materials using punches and dies, made of carbon tool steels of the U10 or U12 type according to GOST 1435. Workpieces made of materials with an increased value of tensile strength are deformed by punches and dies made of alloyed tool steels of type 9XC or X12M according to GOST 5950.

The main types of equipment for bending in dies include:

Sheet bending vertical presses with a mechanical drive (in the domestic press industry, these machines are designated I13_ _, and the last two digits indicate the nominal force).
Sheet bending presses of horizontal execution (I12_ _ series).
Universal multi-slider plate bending machines (A72_ _ series).

The technology of bending with a profiled tool has its limitations:

When stamping on presses, there is always a stage return stroke when no deformation occurs, so performance is declining;
On one set of stamps part can be made strictly defined size. A partial way out is to install several sets of different punches and dies on the press table, for parts that require the same working stroke of the press slider;
Stamps are a technically complex tool, the cost of which is quite high. This negatively affects the price of the final product;
When bending section profiles, cracks are possible in places where the cross section of the workpiece varies.

Based on this, bending with a non-profiled tool should be used only with significant part production programs.

This bending method is based on the use rotary tool. In this case, the deformation occurs due to passing the workpiece into the gap between continuously rotating rolls. The rolls are arranged so that as a result of such a passage, the product acquires the necessary curvature.

High-quality bending of long products - channel, I-beam, corner– is possible only in this way, since in this case the parameters of the cross section of the workpiece will not affect the result.

When processing thin sheet metal, bending occurs along a circle, and long products - along an arc of a circle, which is set by changing the distance between the work rolls.

The most widespread are three-roll sheet and section bending machines.. Two rolls - the lower ones - are supporting, the third - the upper one - is pressure. Roll bending machines can be classified according to the following criteria:

According to the location of the rolls relative to the vertical axis of the equipment - symmetrical and asymmetric. With symmetrically arranged rolls, the pressure roll is placed strictly in the middle, and with an asymmetric scheme, the pressure roll is located above one of the back-up rolls.
According to the width of the rolls, which determines technological capabilities equipment: the longer the rolls, the greater the width of the sheet can be bent on this installation.
By the presence of additional rolls installed either before or after the main ones. Such equipment performs not only bending, but also subsequent straightening of products.
According to the relative position of the work rolls, which can be in the horizontal or vertical plane. The latter is less convenient, but sometimes expedient, because as a result, the overall dimensions of the equipment in the plan are reduced.

Since in rotational bending the force is applied not at the point of contact, but along the arc, the specific load on the rollers is small, which, firstly, increases their durability, and, secondly, makes it possible to use less expensive tool steels for their manufacture.

A roll tool, unlike a stamp tool, is universal, so rotational bending is effective for any programs for the production of final products.

Sequence of operation of sheet and section bending machines. Shell bending.

Bending on sheet bending equipment with a symmetrical arrangement of work rolls includes the following stages:

refill sheet into the space between the rolls, while the front edge of the workpiece should lie on the second backup roll;
Lowering the top swath to a position at which the required curvature of the bent profile is guaranteed;
Turning on the drive, as a result of which the sheet is captured by the forces of friction rolls passes through working area, acquiring the required form;
Refueling the next workpiece, with repetition of the deformation cycle.

The product that has passed through the working area, will not be deformed in the area of the front and rear edges of the sheet by a value equal to half the distance between the backup rolls. The hem is done manually, which is inconvenient. Therefore, if it is necessary to bend the profile along the entire length of the workpiece, you should use rotary machines with asymmetric layout. At the same time, the rear end is guaranteed to be bent, and for the front end, it is enough to start the sheet from the back. Thus, from sheet metal it turns out shell(open cylindrical or conical structural element).

For the possibility of bending a sheet of different thicknesses, the machines provide adjusting the distance between the lower rolls. To do this, the bearings are moved, in which the axes of these rolls rotate. It is also possible to replace the roll with a tool with an increased diameter, which will be required when rotary bending thicker workpieces.

Bending machines operate in a similar way. They are also made in three-roll design, and consist of the following nodes:

Beds.
rollers, the working profile of which corresponds to the section of long products.
side rollers, ensuring the straightness of the movement of the workpiece.
A crossbar that limits the movement of the workpiece in the transverse direction (for symmetrical profiles, for example, channels, the crossbar is moved to the non-working position.
Filling mechanism profile into the working space between the rolls.
electric motor.
intermediate gears.
Drive switching systems.

The section bending machine is adjusted to the required bending radius using the handwheel of the screw mechanism. Small sizes of long products are bent on machines with horizontal work rolls. More versatile are section bending machines with a vertical layout.

Marking of domestically produced rotary bending machines:

I22_ _ - three-roll sheet bending;
I42_ _ - sheet bending four-roll;
I32_ _ - section bending three-roll;
I33 - section bending multi-roll.

To increase the rigidity of metal structures, various configurations of a curved sheet are used, in particular, a bent corner. It is also used for the construction of ventilated facades and in many other areas. The bent angle is obtained from a cold sheet of metal by bending on sheet-bending equipment.

Options for manufacturing a bent corner:

The main condition for obtaining a bent corner is the absence of changes in the properties of the metal during processing. Both the first and the second methods leave the metal structure at the bend points unchanged. In this case, a sheet of metal can have a thickness of up to 10 mm.

Sheet metal bending on a hydraulic press.

Sheet metal bending is a process of processing steel sheets, during which they are given the necessary shape.

The steel sheet is placed on the bending dies of the lower table. The steel sheet can have different thicknesses up to 10 mm and lengths up to 6 meters, depending on the purpose. Under the action of the pistons of the cylinders installed on the upper table, the punches approach the sheet metal laid on the dies of the lower table. After the contact of the punch with the sheet metal, the pressure force begins to increase, and the punch is pressed into the metal sheet or into the sheet metal, deforming it first in the elastic deformation region, and then in the plastic deformation region, which makes it possible to obtain a certain bending of the sheet metal. All those metal layers that are located along the bending axis remain unchanged in size, therefore all calculations are carried out precisely with an orientation to these metal layers.

Steel sheet bending is mainly used for the manufacture of parts of various shapes by cold bending (example: bent corner, bent channel, etc.)

Sheet metal bending on rollers.

There are many ways to bend blanks in cold and hot states. The main use is cold bending of metal on bending machines, hydraulic press brakes and three- or four-roller rolls.

On sheet bending rolls, sheet steel is rolled to form cylindrical, conical, spherical and saddle-shaped surfaces and ring bending (rolling). Corners, channels, pipes and I-beams are rolled on roll bending machines. In order to avoid structural changes, the appearance of significant work hardening and the complete loss of the plastic properties of steel, during cold bending of blanks, residual elongation should not go beyond the yield strength. In the manufacture of bent profiles on bending presses, the internal radii of curvature for carbon steel structures that perceive static loads must be at least 1.2 sheet thicknesses, and for structures that perceive dynamic loads, at least 2.5 sheet thicknesses. For sheet parts from low alloy steels, the minimum values of internal radii of curvature should be 50% greater than for carbon steel.

The plate bending rolls have three or four horizontal rolls on which sheet steel is bent, the maximum width of which is 2100-8000 mm with a maximum thickness of 20-50 mm. The most widespread are three-roll rollers with a pyramidal arrangement of rollers. The two driven bottom rolls rotate in the same direction. The top roll moves in height and rotates as a result of friction between the rolls and the sheet being bent. One bearing of the top roller can be swiveled to the side so that the bent part can be removed. In front of the flexible cylindrical sheet parts, both ends of the sheet are folded on the backing sheet. The backing sheet should have a width that is 2 times the distance between the axes of the lower rolls, and the bending radius should be 10-17% less than the bending radius of the part, taking into account the elastic deformation of the steel. The thickness of the backing sheet is usually taken as 25-30 mm, but it must be at least 2 times the thickness of the rolled sheet, and the power of the rollers must be sufficient to bend the sheet 3 times more than the rolled sheet. After bending, the lining sheet is removed and rolling is started, for which the sheets are passed through the rollers several times in both directions. The degree of sheet bending is adjusted by raising or lowering the top roll.

Both methods allow you to bend a sheet up to 6 meters, while the metal can be either black or stainless. The great advantage of the bent corner can be considered the possibility of manufacturing with a wide variety of shelf sizes. The corner can be symmetrical, but it is possible to produce a different shelf with the specified parameters.

Sheet metal is rarely used in its original form. For its further use, appropriate processing of the feedstock is necessary. The company "Rushar" offers bending and metal calculation services on modern equipment according to customer requirements. Such technological operation allows you to form products of the required shape and size from flat rolled products. Unlike welding, sheet metal bending is less expensive and takes less time.

Applied equipment

Hydraulic press brakes are used to bend metal. Their parameters, dimensions, accuracy standards comply with the requirements of GOST 10560-88. This equipment provides adjustment of effort when bending sheet metal. The presses are equipped with a means of mechanizing the unloading of finished products.

On equipment intended for multi-junction bending, a device is installed program control. The type of the latter is determined by the characteristics of a particular order and the type of rental.

All presses are equipped with holding devices finished product under load, when the bending of the metal is completed. The design of the equipment allows it to be integrated into automatic lines for processing sheet metal.

In the process of bending sheet metal, the product receives a given shape. In this case, the outer layers are stretched, the inner ones are compressed, the middle ones retain their original structure. Mechanical and automatic bending of metal is carried out on the appropriate equipment. The essence of this technological process consists in bending the thin sheet strip at a given angle. The minimum bend radii are calculated according to OST 1 00286-78.

Modern types of sheet metal bending

Air (Air bending) . Such sheet bending is carried out by lowering the punch into the matrix to a predetermined depth. Their dimensions and angle are the same as in the finished part. The bending radius of the metal depends on the properties of the material and the opening of the matrix. The method is universal, it allows obtaining angles of various sizes.
metal bendingby matrix (bottoming) . This technology is somewhat more accurate than the previous one. It is used for sheet metal up to 5 mm. However, matrix sheet bending does not allow bending the original workpiece at an angle of more than 90°.
Machining using a pivot beam (Folding) . Used for bending thin sheet metal (up to 1 mm for structural steel). The method allows you to bend the workpiece in both directions, both up and down.
Slip processing (wiping) . Similar to the previous method. Such sheet bending requires a separate tool for each thickness of rolled products.

Price list with sheet metal bending prices

thickness, mm	up to 100 mm.	up to 1250 mm.	up to 3000 mm.	up to 8000 mm.
0,5 - 0,8	RUB 5.00	RUB 12.00	RUB 25.00	RUB 70.00
1,0 - 1,2	RUB 6.00	RUB 14.00	RUB 25.00	-
1,5	RUB 6.50	RUB 15.00	RUB 26.00	-
2,0 - 2,5	RUB 7.00	RUB 16.00	RUB 26.00	-
3,0	RUB 7.50	RUB 17.00	RUB 33.00	-
4,0	RUB 9.00	RUB 23.00	-	-
5,0	RUB 10.00	RUB 25.00	-	-
6,0	RUB 12.00	RUB 28.00	-	-
8,0	RUB 14.00	-	-	-
10,0	RUB 15.00	-	-	-

Benefits of our services

The Rushar company provides services for bending sheet metal with a thickness of 0.5–6.0 mm. Our main advantages include:

reasonable cost. Availability own production allows us to support affordable prices for sheet metal bending;
high quality work. Used for sheet metal bending modern equipment. Hydraulic presses provide the necessary dimensional accuracy of the finished part;
A complex approach. In addition to sheet metal bending services, we provide waterjet cutting, cold stamping and other custom processing.

High quality products combined with reasonable prices Convenient location The shortest order execution times All types of sheet metal work in one place

Sheet metal bending allows, with relatively little effort, to obtain a product of the desired shape. For welding requires more effort, both physical and financial. A sheet of metal can be bent manually or using automation, however general principles work remains the same. It is about the features of this process that will be discussed.

Basic principles

metal bending carried out various methods. Welding is often used, but temperature effects can change the shape and properties of the finished product. This reduces the operational properties and manufacturing accuracy.

Since when bending the metal, the outer layers of the metal are stretched, and the inner ones begin to shrink, it is necessary to bend a part of the rolled metal at a given angle relative to the other. The angle can be found using calculations.

The product is deformed by those values that are within the specified limits. They depend on the following parameters:

The thickness of the metal sheet;
How much is the angle of inflection;
How durable is the material?
The speed and time of the procedure.

It is from them that the indicator of permissible deformation will depend. The next step is to choose the type of bending.

metal bending produced manually and with the use of automatic devices. In the first case, the process will be quite labor-intensive, it will require the use of pliers and a hammer, as a result, this procedure will take a lot of time.

It will be much easier and better to mechanize the process with the help of machine tools and related devices. The shape of a cylinder is given to the product by special rollers. With their help, chimneys, gutters, pipe products are created.

The development of machine tool production made it possible to achieve bending of the material for the manufacture of the most complex products. A quick replacement of the working tool allows you to most effectively and quickly reconfigure the machine tool.

Equipment types

For modern process there are many options for the latest devices for bending metal. Presses are commonly used in production. which can be divided into the following types:

Of all the above types of equipment, the most modern is rotary. It operates automatically, and the worker does not need to calculate the optimal value of the force in advance.

Rotary presses are also considered automated. Here one sheet is sent to the device, which needs to be positioned as needed for the job. It is most often used in small enterprises where they work with metal parts.

Handmade

This work is usually done with hand scissors.. Marks are placed in the right places, according to which the metal will be manually bended. The sheet is securely fixed in a vice. The first fold is made with a massive hammer. The product is moved to a new place of the fold, clamped with a bar of wood, bent in the right direction.

Upon completion of the work, it is necessary to make sure that the product meets the established standards. The check is carried out using a square and, if necessary, defects are eliminated.

Self-manufacturing of the machine

Sometimes you need to make a machine at home. This will facilitate the work of bending metal and increase productivity. Here you will need a corner, a metal beam, hinges with bolts, clamps, handles, a table and welding machine. The procedure is as follows:

Check the bolts to make sure they are tight. Turn the traverses and bend in such a way as to form the desired angle. This will allow you not to waste time calculating the angle.

Whatever the devices the main principles remain unchanged. Following them, you can get products that meet the standards and wishes of the customer.