Working principle of CNC bending machine. Press brakes Durma series AD-R. Quick hardware setup

Modern factory equipment in most cases necessarily includes a CNC press brake: such machines allow you to bend metal blanks quickly, accurately and at minimal cost, both time and financial. Among the products manufactured by DURMA (Turkey), experts recommend paying attention to the AD-R presses, which are distinguished by their versatility of operation and high accuracy of operations.

Economic CNC Press Brake

DURMA brand products are designed for the widest range of customers, and therefore the company pays special attention to reducing the cost of equipment that is used most in demand. It was within the framework of this program that Turkish designers developed the presses of the AD-R line.

CNC bending (bending) press DURMA:

• True innovation
• A combination of efficiency, affordability and simplicity
• The best ratio "complexity of work / cost of equipment" in the competitive range
• Intuitive CNC control
• Special design control box and software provide ease of setting up the operation of the equipment, and control will become possible even for untrained workers.
• Excellent bending quality, easy input of bending angle and other operations
• Rugged cast construction is the hallmark of DURMA equipment
• The work is simple and comfortable in all respects.
• Increased "clearance" and overall working space optimizes work with complex multiple bends
• Designed and produced for the low-price segment of the market, while complying with the "Premium" class
• practically has no restrictions on the complexity of the processed workpieces;
• has a high level of functionality;
• belongs to the category of highly profitable equipment;
• has an impeccable level of quality and all the necessary manufacturer's warranties.

Synchronized hydraulic bending press DURMA AD-R from the "economy" series has become a successful development of the AD-E model. The unit is designed for a wide range of customers who would like to minimize the number of control functions. In the new series of presses, sheet processing is carried out according to the program, which is formed directly by the operator, who exercises subsequent control over its development. The main programmable operations are approach speed, return speed and working stroke. So, the quality of the finished product is significantly increased by eliminating deformations in the bend zone, if you set the mode of moving the slider up at low speed, followed by a stop and a transition to the standby state. When working with stainless steel and some other unusual materials, it is useful to program a slow shutter or delay. For these purposes, the CNC Easy controller is included in the standard set of AD-R presses.

All representatives of the DURMA AD-R family of hydraulic press brakes have three axes under CNC control: X - positioning of the backgauge, Y1 and Y2 - movement of the slider. The process of programming the controller is simplified as much as possible and is carried out from the control panel, due to which the time for manufacturing the part is significantly reduced. Having received the initial information about the dimensions of the product and the sequence of technological operations, CNC independently calculates the bending angle, the initial and final positions of the slider and back gauge, as well as their movement along the axes.

At the request of the customer, the basic set of the AD-R press can be supplemented with a desktop deflection compensation system (automatic under the control of the controller or manual), a color graphic monitor connected to the CNC Easy and a scheme for determining the sequence of bending and sheet rotation operations.

Hydraulic presses of the DURMA-D series have automatic calibration, which makes it possible to manufacture precision products on them with a positioning accuracy of up to 0.05 mm. The hydraulics of the unit is equipped with components manufactured by Bosch, and its electrical part is built on elements from Omron, Telemecanique and Siemens.

Products with the DURMA trademark have gained popularity in Russia due to the highest responsibility of the manufacturer for the fulfillment of contractual obligations, a modern system of warranty and post-warranty service, and the best quality-price ratio in its market segment.

Key Standard Components
Top beam guides	Increased stroke, clearance and feed depth
Double guides increase the accuracy of the movement of the upper beam	The working space on the AD-R series machines has been increased, which greatly facilitated the work and reduced the time production cycle
Motorized X axis stroke controlled by CNC	Front support
The height of the backgauge (R-axis) is set manually. The positioning depth of the finger blocks is calculated by the CNC. Backgauge rollback is a standard feature to ensure positioning accuracy. Finger blocks move along linear guides on bearings	The front support is quickly mounted on linear guides and ball bearings, which allow you to easily move the workpiece in a horizontal plane.
Tool holder
Euroclamp Multi-V	Quick release clamp
This tool holding system allows for precise parallelism
Security systems comply with CE regulations
The machine can be equipped with additional safety systems in accordance with CE
	Durma CNC Easy Bend
	More effective and thorough control than in serial machines Training time 5 minutes More productive than analogues More cost effective than comparable machines Less service costs than serial machines Simplified screen with fewer buttons Easy to manage Does not require additional reprogramming Full control over all bending steps Instrument options are already stored in memory Ability to adjust the process USB interface Ease of upgrade
	Durma CNC Advantage
	Monitor with a diagonal of 19 cm with a 2-dimensional scan on the working screen Lightweight bend settings Automatic bend sequencing Complete calculation of dimensions and parts Safety system Offline software (programming and setting up the operation of machine components) Motorized table deflection compensation I/O control Tandem work USB interface for backing up and restoring programs, instrument settings, parameters Free Support 85 programs (up to 12 steps each) Provision on disk or other media
	DNC 880s - CNC 2D
	DNC 8805 - controller designed specifically for bending equipment It is used both on fully synchronized machines and on serial machines with a simplified control system with an electric or hydraulic motor. DNC 880s - Competitively priced performance benchmark in a compact design 25 cm color screen Displaying the bending process in real time on a 2D screen Windows XP is preinstalled for job and data management Communication with external devices via USB port for data backup. Over 20 languages ​​available

Standard equipment

Optional extras

CNC Easy Bend digital controller - 3 axis control 3 asymmetrical axes Y1, Y2, X - CNC control R-axis (vertical positioning of the backgauge) - manual control EURO type tool clamp Electromechanical backgauge, linear guide and bearings Support rods with T-profile and stop Finger blocks on the rear stop with height adjustment Matrix holder

Advantage controller - 7 axes control Controller DNC 8805 - control of all available axes Motorized R axis controlled by CNC Rear gauge 1000mm Quick release clamp (set) Manual table deflection compensation CNC motorized table deflection compensation Laser illumination FIESSLER AKAS (manual) DFS1 Photoelectric Laser for Bottom Beam Additional finger block Additional support bar oil cooling Second foot pedal Special painting Controller on the opposite side

Specifications
AD-R series press brakes from 1250 mm. up to 3050 mm.

AD-R series		Unit measurements	1260			30100	30135	30175	30220	30320
Working force		tons	60	60	100	100	135	175	220	320
Working length	(A)	mm	1250	2050	2550	3050	3050	3050	3050	3050
Distance between supports	(B)	mm	1050	1700	2200	2600	2600	2600	2600	2600
		mm/sec	75	200	180	180	160	120	120	100
Y-axis working speed		mm/sec	9	10	10	10	10	10	10	10
		mm/sec	50	120	120	120	120	100	100	100
Clearance	(D)	mm	370	530	530	530	530	530	530	630
Table width	(G)	mm	104	104	104	104	104	104	104	154
Table height	(F)	mm	828	900	900	900	900	900	900	900
move	(C)	mm	160	265	265	265	265	265	265	365
Sheet feeding depth	(E)	mm	350	410	410	410	410	410	410	410
Support rods		PCS.	2	2	2	2	2	2	2	2
		PCS.	2	2	2	2	2	2	2	2
X-axis travel speed		mm/sec	250	250	250	250	250	250	250	250
X-axis travel		mm	430	430	650	650	650	650	650	650
Engine power		kW	4	7,5	11	11	15	18,5	22	37
Oil tank capacity		L	60	100	100	100	150	250	250	250
Length	(L)	mm	2100	3300	3800	4200	4200	4350	4250	4300
Width	(W)	mm	1250	1650	1670	1670	1680	1700	1770	1820
Height	(H)	mm	2400	2750	2750	2750	2750	2750	2750	3230
The weight		kg	3200	6100	8650	9250	10250	11250	12250	17250

Specifications
AD-R series press brakes from 3700 mm. up to 6050 mm.

AD-R series		Unit measurements	37175	37220	40175	40220	40320	40400	60220	60320	60400
Working force		tons	175	220	175	220	320	400	220	320	400
Working length	(A)	mm	3700	3700	4050	4050	4050	4050	6050	6050	6050
Distance between supports	(B)	mm	3100	3100	3600	3600	3600	3400	5100	5100	5100
Y-axis speed in rapid mode		mm/sec	120	120	120	120	100	100	100	100	100
Y-axis working speed		mm/sec	10	10	10	10	10	8	10	10	8
Y-axis reverse speed		mm/sec	100	100	100	100	100	80	100	100	80
Clearance	(D)	mm	530	530	530	530	630	630	530	630	630
Table width	(G)	mm	104	104	104	104	154	154	154	154	154
Table height	(F)	mm	900	900	900	900	900	1040	1100	1100	1220
move	(C)	mm	265	265	265	265	365	365	365	365	365
Sheet feeding depth	(E)	mm	410	410	410	410	410	510	410	410	510
Support rods		PCS.	2	2	2	2	2	2	4	4	4
Number of fingers on the back stop		PCS.	2	2	2	2	2	2	4	4	4
X-axis travel speed		mm/sec	250	250	250	250	250	250	250	250	250
X-axis travel		mm	650	650	650	650	650	750	750	750	750
Engine power		kW	18.5	22	18.5	22	37	37	22	37	37
Oil tank capacity		L	250	250	250	250	250	450	250	250	500
Length	(L)	mm	4950	4950	5250	5250	5300	5750	7500	7500	7500
Width	(W)	mm	1700	1770	1700	1770	1910	2110	1770	1910	2110
Height	(H)	mm	2900	2900	2750	2900	3230	3540	3250	3450	3710
The weight		kg	17250	14100	12850	14750	20750	26750	20590	28250	35750

DURMA pursues a consistent policy of reducing the cost of the main types of production equipment. The AD-R press line was developed by the company's designers as part of this program.

The vertical bending press has no restrictions on the complexity of the processed products, it combines high functionality and unconditional profitability. By selling equipment on the Russian market, DURMA offers its customers the best ratio of cost, quality assurance and comfortable trading conditions.

A press brake equipped with a hydraulic drive can be found today in the equipment of many manufacturing enterprises operating in various industries. This device, on which a metal workpiece is processed according to the cold deformation method, makes it possible to manufacture products whose geometric parameters exactly correspond to the specified values.

History of development and application advantages

The hydraulic sheet bender, which began to be used by manufacturing enterprises in the middle of the 20th century, replaced manual and mechanical devices designed for bending sheet metal. Along with high efficiency and economy of use, a manual bending press also has a number of significant disadvantages, primarily related to the impossibility of obtaining products with precise geometric parameters with its help, as well as the application of significant physical effort when using it.

Mechanical press brakes are also not without disadvantages, which are as follows:

• The operation of such a machine is accompanied by significant noise and strong vibration.
• Products made on such equipment are not of high quality.
• When operating such a machine, the risk of injury to the operator who operates it is too great.
• The use of such a press brake is associated with increased power consumption.
• Changeover mechanical is a rather complicated procedure.

In addition to mechanical and manual, on modern market pneumatically driven press brakes are also available. Such equipment, the operation of which requires a centralized compressed air network, has one very serious drawback: even with an increase in the size of the machine, the force developed by it, with which it acts on the workpiece being processed, does not allow processing sheet metal products of considerable thickness.

Having appeared on the market, the hydraulic sheet bender, which has the highest power among all equipment of this type, has made a real breakthrough in the processing of sheet metal by bending. Such a press bender, in addition to high power, has many other advantages:

1. high level of security;
2. high reliability;
3. the ability to produce products of exceptionally high quality.

Having appeared on the market in the middle of the 20th century, hydraulic models of sheet bending machines have acquired a number of significant improvements, which made it possible to endow these devices with additional functionality, make them more convenient and safe to use. Equipping a modern hydraulic press brake with innovative devices and additional mechanisms allows it to be used to successfully solve even the most challenging tasks associated with flexible sheet metal. Among such devices and mechanisms are:

1. a CNC system for a press brake (such a system, equipped with a graphical user interface, is able to independently determine the modes and sequence of technological operations);
2. mechanisms to ensure increased protection machine operator from injury;
3. electronic devices that are responsible for adjusting the speed of movement of the traverse;
4. an indicator that provides control over the angle of the bend being performed.

This is just a small list of additional elements that may be present in the design of a hydraulic press brake. The presence of such equipment significantly expands the functionality of the machine and makes it possible to use it to solve special problems.

Design features

The press bender equipped with a hydraulic drive is used to solve the following technological problems:

• the formation of bent metal products, the geometric parameters of which exactly correspond to the specified parameters;
• one of the steps technological process processing of products from sheet steel, the thickness of which exceeds 3.5 mm;
• performing high-quality and inexpensive bending of products from sheet steel, the thickness of which does not exceed 3.5 mm;
• production by bending large batches of the same type of sheet steel products.

According to the degree of its mobility, a hydraulic sheet bender can be mobile or stationary. Stationary presses for bending metal, equipped with a hydraulic drive, are distinguished by high power and productivity. They are used to process a large number of workpieces in a limited period of time. In addition, stationary hydraulic sheet benders, due to their technical capabilities, are successfully used for processing workpieces made of even very thick sheet metal. Mobile or mobile presses, also powered by a hydraulic drive, can be easily moved to any site where they are planned to be used for their intended purpose.

The principle of operation of a bending press is that its working body, which is a traverse, is informed of the required direction of movement and the level of force with which it acts on the workpiece being processed. The traverse is a rigid beam made of steel. It is on it that the working devices are fixed, with the help of which the product is formed with the given geometric parameters.

For the accuracy of the movement of the traverse, which directly affects the accuracy and quality of the processing performed, two linear sensors are responsible, one of which monitors the right side of the working body, and the second - behind the left. In order to be able to form a bent edge with the required geometric parameters on hydraulic sheet bending machines, most models are equipped with a rear programmable stop. Hydraulic sheet benders are practically indispensable equipment in the production of products for the following purposes:

• body parts for household and industrial equipment, electrical devices for various purposes;
• hull elements Vehicle;
• bent metal products for any other purpose.

Using a special bending tool for press brakes, such equipment can successfully process sheet metal blanks having a cylindrical and conical configuration.

Principle of operation

The principle of operation of a hydraulically driven press brake is quite simple, but nevertheless ensures both high productivity of technological operations and their safety.

The process of bending sheet metal blanks when using a machine of this category is performed in the following sequence:

1. The press traverse is fixed in the "dead center" of the bending equipment, located in its upper part.
2. In order for the traverse to start moving from top to bottom at the required speed, a foot pedal or button is used to control this mechanism. Up to a certain position, the traverse moves at a free fall speed that is higher than the speed required to perform the bend. Despite this definition, there is no free fall of the traverse as such, its every movement is controlled and controlled by means of appropriate equipment.
3. When the traverse is as close as possible to the surface of the workpiece being processed, the working speed is reported to the beam. The control of all movements of the traverse, as well as the operating modes of such movements, is provided by the hydraulic system of the press brake, and hardware adjustment tools or special sensors are responsible for controlling such processes.
4. The traverse of the machine, after informing it of the working speed, tends to the lower "dead center", after reaching which it is kept in this position for some time. Holding the traverse at the bottom "dead center" is necessary in order to ensure a uniform load on the surface of the workpiece, which is subjected to the bending process.
5. It is very important after the end of the bending of the workpiece to begin to raise the traverse at a certain speed, which has no less impact on the quality of the processing performed than the process itself. The stage of the bending process, at which the traverse rises above the surface of the just processed workpiece, is called decompression.
6. After the end of decompression, the traverse with enough high speed returns to top dead center.
7. The equipment is turned off and the finished product is removed from the processing area.

The technological process of bending a sheet metal workpiece, carried out on a bending press equipped with additional working mechanisms, may differ somewhat from the scheme described above, but in general its essence remains unchanged.

When processing workpieces on a hydraulic bending machine, several basic parameters of both the equipment used and the technological process are guided. These options include, in particular:

• working length of the equipment used;
• the force that the working body of the press exerts on the workpiece being processed;
• the performance with which processing is performed.

In addition to the main ones, there are also a number of additional parameters that must also be taken into account both when choosing a press and when performing processing. These options include:

• distance between the side racks of the machine;
• the speed at which work operations are performed;
• the maximum distance that the traverse can rise, etc.

Brief description of LGSG-28 model

In the equipment of many manufacturing enterprises whose activities are related to the need to bend sheet metal blanks, you can find the LGSG-28 model for bending, the manufacturer of which is the Lipetsk plant for the production of special roll forming equipment. The technical capabilities of such a press make it possible to successfully use it for bending sheet metal blanks with a thickness of up to 3 mm and a length of up to 2.5 m.

The most appropriate use of the machine of this model is for those enterprises that are engaged in the production of the same type of metal products in medium and large series. Of the most significant advantages of the press brake of this model, it is worth highlighting:

1. low noise level emitted during operation of the device;
2. ease of management and maintenance;
3. optimal combination of functionality and cost;
4. economical consumption of electricity;
5. the ability to perform bending both in manual and fully automated mode;
6. high versatility;
7. high reliability, availability of spare parts and components for maintenance and repair.

The hydraulic equipment that the press of this model is equipped with allows developing a force in the bending area, reaching a value of 20 tons. The maximum bending angle that such equipment allows to reach is 105°, and it is possible to perform it at a minimum width corresponding to 4 cm.

CNC machines

Recently, sheet bending machines have become very popular. hydraulic presses, in the equipment of which there is a numerical program block responsible for controlling the device. Such equipment, which can be a bending machine with a rotary beam, and machines of any other type, allows you to perform technological operations with high precision and performance.

Due to their reliability and wide functionality, CNC bending machines manufactured in Portugal under the Adira trademark have gained great popularity among domestic manufacturers. CNC hydraulic press brake given trademark presented on domestic market models of different power and functionality, but all of them are distinguished by the following advantages:

• durable traverse, made in a monoblock design;
• compact dimensions of the hydraulic equipment installed on the machines;
• the presence of two types of protection against overloads: hydraulic and electrical;
• the presence in the design of the machine of two servo valves, which are controlled in automatic mode;
• ease of setting all modes of operation;
• high performance and Russification of controllers installed on this CNC bending machine;
• Strong backgauge design equipped with four steerable axles.

All models of hydraulic press brakes manufactured by YuUMZ LLC can be equipped with various numerical control systems (CNC) by order of customers. CNC Press Brake (CNC Press Brake) allows you to carry out bending, which on a conventional bending machine takes a very long period of time or it is impossible to do it at all. CNC systems for press brakes are now very numerous from various manufacturers, ranging from the simplest, controlling only two axes X and Y up to systems that control the 9 axes of the press and allow the operator to make adjustments to the work directly during the bending process.

The photo shows the control panels of various CNC systems from the simplest to models with 2D and 3D visualization on the screen.

The most popular CNC sheet benders control 3 axes: Y1-Y2-axes of the slider and X-axis of the backgauge. Metal bending on a CNC press brake is much more accurate and takes much less time, since the CNC system avoids such errors as underbending or bending of the product, automatically rearranges the back stops to the required parameters in height, depth and width. The CNC system on the press brake monitors and controls the movement of the slider - in two axes, the movement of the back gauges - in six axes (when the press brake is equipped with the appropriate back gauge), as well as the operation of the bombing system (table deflection compensation system) - the axes of the press brake are shown on figure.

All modern systems CNC for press brakes have in their functionality:

Database of materials and tools;

Possibility to enter new material bending parameters data;

Automatic calculation of the coordinates of all axes for each operation and the optimal bending sequence, the ability to change this sequence manually;

Automatic calculation of the developed length of the part;

Possibility of simple adjustment of the bending angle by entering the obtained angle after the first bend;

Sufficient memory to store the programs used;

Ability to add a new tool;

Graphical display of the sequence of bends, the possibility of graphical input of the dimensions of the resulting part have models with 2D and 3D visualization on the controller screen.

Availability listed functions on a CNC bending machine allows the operator to quickly enter and calculate programs directly on the CNC with minimal time spent on their preparation. The absence of them complicates the work, increases the time spent on preparing control programs and performing test bends.

A CNC press brake (CNC press brake) allows you to produce a very accurate bend with optimal time and energy consumption and - what is important in the first place - high quality of the resulting product!

Technical consultants will help you choose the necessary CNC press brake manufactured by YuUMZ LLC.

Description of some models of CNC controllers:

Compact controller DELEM DA-56 provides convenient programming through two-dimensional graphic design CNC DELEM (Holland). The use of stored tools allows you to easily and quickly set up the machine and carry out test bending.

The CNC controller is equipped with touch buttons. The program automatically calculates the positions of all axes and the bending sequence and displays the tool and workpiece on the display.

In the process of controlling the machine, the operator, using the DA-56 control program, has the ability to graphically simulate the process of bending the workpiece. The basic control functions of the machine are the control of the axes Y1, Y2, X. The second axis of the backgauge can be R/Z or X2.

The CNC controller is designed with the latest technology and is flexible and easy to use.

The color TFT LCD display and the modern interface gives the user the possibility of quick orientation in the program and a convenient process of setting parameters.

Characteristics:

• 2D graphic programming
• Color screen 10.4” LCD TFT
• Determination of the bending sequence
• Axial length calculation
• Part convexity control
• USB interface for peripherals
• Auxiliary frequency converter and AC regulator
• Processor 200 MHz
• Memory 32 MB
• Product and tool memory 2 MB
• Economical housing design

Data sheet:

• 7 program levels
• Drawing numbering: 20 alphanumeric characters
• Program repeatability: 9.999
• Number of program steps: max. 99 (consecutive)
• Step repeatability: max. 99
• Measurement: millimeters / inches
• Counting of machined parts
• Memory function in case of power failure
• Error reporting system
• Enclosure with built-in control panel
• Programmable deceleration of the axes
• Source material programming
• Tool programming

Count:

• Tool safety distance
• Bending forces
• Allowance for bending
• Bulge adjustments
• Axial length
• Lower bombing force
• Tool Collisions
• Angle corrections

Interface:

• Bidirectional DNC RS-232C

Axes control:

• Unipolar frequency converter control
• Two speed axis control for AC motor
• Control of axes Y1, Y2, X, Z

Secondary functions:

• Error and Fault Detection Program
• Control language selection
• Dialog Messaging
• Help in the on-line system
• Optoisolated Input/Output

ESTUN E200- the controller is specially designed for press brakes and guillotines with the most modern electronic technologies to control the backgauge and punch movement.
Easily switch between various functions, friendly interface, convenient operation, and a large amount of information on the screen is available for the user to easily program, parameter setting and automatic processing operations are easier, more convenient and faster.
With Estun's patented motion control technology and CAN BUS interface to connect to Estun's own EDC series in an AC servo system, performances are fully reproduced.
Selectable menu language between: English / Chinese, selectable measurement system between: inch / mm meet the different requirements of customers from different countries.
The controller has passed rigorous EMC testing and has been CE certified and approved by TUV Rheinland Group in Germany.

Main technical characteristics:
Bright LCD display, 240 x 128
One-sided positioning ball screw backlash elimination
Choice of measurement system: inch / mm
Position compensation
Remembering the position of the punch
Automatic search for landmarks and remembering the position
Enough storage space for 40 programs
Multi-step programming 25 blocks (steps) per program
Possibility to choose between: English menu or Chinese
Control: X-axis backgauge, and Y-axis travel
Setting automatic work and rapid traverse
Bend counter
Easy force setting
Possibility of multi-stage programming during automatic program operation, and continuous positioning
In the event of a power failure: remembers the position of the program and the parameters of the sensors and the position of the punch
Single and joint positioning of axes
Fixing screw gap
Automatic datum search
Automatic system that prevents the backgauge from colliding with the workpiece
Automatic location correction
Saving data in memory after turning off the power

Hydraulic bending machine is used in various manufacturing enterprises for bending sheet metal using a cold method with strict observance of the specified bend angles.

1 How did hydraulic bending machines come about?

Initially world industry produced sheet benders of mechanical and manual type. They were simple and reliable in operation, had a simple design and did not require excessive costs for their production. It is clear that it did not provide the proper bending accuracy, and for its use it was necessary to apply considerable physical force. The mechanical equipment also had a lot of shortcomings:

• high degree of vibration and noise during operation;
• low quality of manufactured products;
• increased risk of injury to the plant operator;
• high consumption of electrical energy;
• Difficulty in the need for readjustment of machines.

Simultaneously with mechanical presses, pneumatic equipment began to be used for bending metal blanks. It was operated quite limitedly, since for the operation of such units it was necessary to bring to them compressed air on a dedicated highway. And the load force that they could provide was relatively small.

A real breakthrough in sheet metal bending was the appearance in the middle of the 20th century of hydraulic presses, which were distinguished by low electricity consumption, a high level of work safety, almost impeccable reliability and excellent product quality.

Per last years The standard hydraulic press brake has undergone many changes. Nowadays, it is equipped with innovative devices and mechanisms that greatly facilitate the procedure for bending metal blanks. These include the following devices and developments:

• graphical user interface that allows program management machine independently determine and set the bending sequence;
• adjustment equipment electronic devices traverse speed;
• protecting the operator from injury;
• bending angle control indicators.

It is possible to list the modern additional equipment installed on hydraulic sheet benders for quite a long time. We will talk about many special mechanisms and intricacies of using CNC bending machines, describing their popular brands.

2 General information about plants and how they work

The described equipment is usually used in production in the following situations:

• to obtain ideal products in terms of quality and accuracy;
• as one of the stages of the process of industrial processing of metal blanks with a thickness of 3.5 millimeters;
• for quick and inexpensive bending of metal sheets with a thickness of less than 3.5 millimeters;
• when performing bending operations of the same type of products (when tool settings do not need to be changed too often).

Listogib on hydraulics happen stationary and mobile. The former are used in one place, they can process large volumes of metal. And the second, mobile, is allowed to operate at different facilities. As a rule, they are purchased by small manufacturing companies. Both the first and the second at the same time operate on the energy of hydraulic cylinders, which eliminates the need for efforts on the part of the operator of the bending machine.

The essence of the operation of the described equipment is to provide the specified values ​​of the stroke (working) of the traverse of the installation and the required effort. A traverse is a rigid steel beam. Devices for specific bending modes are mounted on it, taking into account the characteristics of the workpiece being processed.

The traverse moves under the constant control of special linear sensors. Usually two pieces are installed on sheet benders (one "follows" the right side of the beam, the other behind the left), which guarantees the uniformity of the traverse. On most bending machines, in addition, a rear programmable stop is mounted. It allows you to get a bent metal edge with certain geometric values.

Sheet benders on hydraulic cylinders today are considered indispensable in the production of materials for hull construction, electronic products, appliances and household appliances, vehicles and special vehicles. They are also necessary for the manufacture of bent products used in machine and machine tool building. When installing additional mechanisms, hydraulic sheet bending machines process cylindrical and conical surfaces of different diameters without any problems.

3 Algorithm for bending metal on sheet benders with hydraulic cylinders

The technology for processing sheet metal blanks on the equipment in question does not have any particular difficulties. At the same time, it ensures maximum productivity of plate benders and high security performance of work.

In general, the process of bending blanks on the units of interest to us is carried out in seven stages:

Bending machines with additional mechanisms can, of course, function with some additional steps. But the bending of metal products itself is performed exactly according to the described algorithm.

We add that the processing of workpieces on sheet benders with hydraulic cylinders is described by three main parameters - the working length of the machine, the power of the developed load on the part, the productivity per certain time, as well as several additional characteristics (the distance between the racks of the unit, the speed of performing work operations, the amplitude with which the traverse can move, and others).

4 Machine LGSG-28 - brief description

Press LGSG-28 Lipetsk plant for the production of roll forming special equipment is very popular with Russian companies, which are engaged in the production of different and corners, as well as other products for the construction industry. This unit is capable of processing at the highest level of efficiency sheet metal up to 3 mm thick and up to 2.5 meters long.

• slight noise during operation;
• elementary management;
• an excellent ratio of functionality and cost;
• low consumption of electrical energy;
• the ability to perform bending in manual and fully automatic modes;
• sufficiently high versatility.

LGSG-28 develops a bending force of up to 20 tons, provides a bending angle of up to 105 degrees. dimensions machine - 280 by 80 by 200 centimeters with a weight of about 2 thousand kilograms. This equipment allows you to get a minimum bend at the level of four centimeters.

It must be noted that LGSG-28 breaks very rarely. But even in situations where it becomes necessary to repair it (replacement of components that have naturally failed), users have no problems with "updating" the machine. The Lipetsk plant produces in sufficient quantities a complete range of spare parts for its bending machine.

5 Overview of CNC press brakes

Hydraulic units for metal bending are now equipped with CNC systems. Such equipment is characterized by high accuracy and efficiency of work. Sheet bending machines of many well-known manufacturers from Europe are presented on the domestic market. We will tell you a little more about some companies and their products.

Listogibs of the Portuguese brand are considered popular Adira produced in the city of Porto. Russian enterprises purchase equipment of the series RN(models 16060, 30060, 40070, 50070, 60060, 110080, 135070, etc.), which is supplied with motors of different power (from 15 to 110 kW), bending speed (from 6.5 to 10 mm/s) and pressing force ( from 160 to 2000 tons). All of them are characterized by the following operational advantages:

• compact dimensions of hydraulic stations;
• stabilized monoblock strong traverse;
• the presence of two servo valves with automatic control;
• hydraulic and electrical overload protection;
• simple adjustment of the indicator of lowering the traverse and programming of all values ​​of the technological process without exception;
• high-performance numerical color controllers with Russification;
• powerful emphasis (rear) with four controlled axles.

Also well-known units under the brand MetalMaster(models 2563K, HPJ-k 1340, 2580, 32200) with many features, reliable hydraulics, modern instrumentation and construction of heat-treated welded components. These sheet benders are controlled by a numerical complex ESTUN, allowing you to perform step-by-step programming of any number of work operations in inch and metric coordinate systems.