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Nowadays, pipe bender technology is widely used in electric power construction in our country, such as highway and railway construction, boilers, bridges, ships, furniture, home appliances and decoration industries, and its craftsmanship is also constantly developing with the progress of modern technology. A tube bending machine made in China must be used when processing automobile exhaust pipes. Pipe bending technology is also a part of the automobile muffler processing technology that cannot be underestimated. Here are six characteristics of computer-controlled cnc tube benders:

　　1. The elbow head can move horizontally along the guide rail. This is necessary for the pipe bender to adjust the pipe groove of the bending die to the center line of the machine tool after the bending die is replaced. This is simpler than adjusting the centerline of the machine tool by adjusting the guide rail and tailstock on the bed.

　　2. The trolley that completes the linear feed motion (DBB) is pulled forward by the tube during the bending process of the tube. In this way, the "positive thrust" is removed, thereby eliminating the problem of synchronization between the trolley and the bending speed, and the negative feedback system of the DC motor set to increase the "positive thrust" is removed, and the electrical circuit is simplified. Because the positive thrust is beneficial to the bending of the pipe, especially when the pipe with a larger diameter is bent, the positive thrust is necessary. Therefore, the VB pipe bender adds a booster device.

　　3. When bending, because the trolley acts as a load, it is pulled forward by the tube. In order to improve the bending, avoid excessive thinning of the wall thickness of the bending part of the tube, reduce rebound, and increase the booster device. When bending, the die not only compresses the tube, but is also pushed forward by the thrust to form a side thrust to help the bending.

　　4. The pipe bending arm and the bending spindle are connected into one body, the pipe bending mold axis can be replaced, and the clamping mold can move up and down. This not only has a reasonable structure, increases the strength of the mechanical part, but also has a simple structure, which simplifies the electrical circuit.

5. When entering the last turn, the cart may collide with the die. At this time, the "interference zone" function can be used, that is, the die returns → the cart continues to feed → the elbow arm returns → the space corner (POB) → the clamping die Clamping→releasing the chuck, the trolley exits the interference zone→compressing the die→bending the pipe. In this way, the bend not only avoids the collision between the trolley and the die, and ensures the smooth completion of the last bend, but also reduces the clamping loss of the material head and reduces the production cost.

　　6. The bed adopts a welded structure, which is simple and compact.

The automatic pipe bending machine can automatically complete the pipe molding work under the condition of complete specific work procedures, which brings more convenience to the bending work, saves the human resources in the working process, and reduces the risk in the operation process. Automatic management and control can also smoothly complete the bending work. The pipe bender will have heating phenomenon in the long-term work, so we have made the treatment to the overheating phenomenon, mainly through the way of cooling, so is cooling really so important to the pipe bender? Today's wonsten staff will give a detailed introduction.

Timely cooling can make the bending part of tube blank cool rapidly under the action of cooling medium, which can effectively prevent the inner wall of tube blank from wrinkle during bending. The cooling system is mainly divided into two forms: one is water cooling system, which is used for bending carbon steel pipe and low alloy steel pipe; the other is air cooling system, which is used for bending stainless steel pipe. All the water used in the water cooling system is softened water. The softened water system is the equipment to control the quality of cooling water. The use of softened water is beneficial to prolong the service life of the equipment.

The cooling system of automatic pipe bender plays a very important role. In the field of automation, rotary encoder is used to detect displacement, angle, velocity and acceleration sensor. Depending on the control of screw, gear, measuring wheel or cable, the angle input to the shaft is converted into corresponding electric pulse or digital value by using the principle of rotation conversion. It has the advantages of small volume, high precision, reliable operation and digital interface. The encoder can convert the actual mechanical parameter values into electrical signals, which can be processed by counter, tachometer, PLC and IPC.

Encoder is widely used in CNC machine tools, turntable, clothing transmission, robot, radar, military target measurement and other devices that need to detect the angle. Rotary encoder is the most widely used sensor, which is composed of grating disk and photoelectric detection device. A grating disk is a circular plate with a certain diameter, which opens a number of rectangular holes equally. Because the rotary encoder is coaxial with the motor, when the motor rotates, the grating disk and the motor rotate at the same speed, and several pulse signals are detected and output by the detection device composed of LED and other electronic components.

Wonsten -  China pipe and tube bending machine factory and manufacturer

Pipe bending machine is a kind of shearing equipment widely used in machining, it can cut steel plate materials of various thicknesses. The production of the pipe bender is mainly because people need to bend an object and spend a long time, and the aesthetics is not as good as that produced by the machine. Therefore, the pipe bender product is developed to make the object bend more beautiful. The pipe bender is the most common type of machine in our lives. It is mainly used to bend an object, which reduces labor costs in the traditional mode and greatly improves work efficiency.

　　The tube bending machine is composed of a driving device, a guide wheel device, a pre-compression device, a rocker arm slewing device, a chuck device, a base, an intermediate frequency power supply, a hydraulic system and other components. The rocker arm rotation device is the core component of the pipe bender. Its function is to bend the heated pipe into a radius that meets the specified requirements, and has the functions of bending, turning, and reducing. The rocker arm slewing device is mainly composed of large slide table, rocker arm drive device, rocker arm, middle slide table, slewing support, small slide table and other components. The rocker arm driving device is installed on the side of the large sliding table, the rocker arm is fixed on the large sliding table through a slewing support, and the middle sliding table is fixed on the rocker arm, changing the position of the large and middle sliding tables, thus adjusting the rotation center and the chuck The distance between the center lines is to adjust the bending radius of the pipe.

　　 Sharing on the characteristics of the rocker arm slewing device of the large pipe bender:

　　 1. The return position is driven by hydraulic pressure, with compact structure, large driving force, high reliability, and adjustable rotation speed.

　　 2. Ball bearing type rotary support is used as the rotary positioning element, which has high rotary accuracy, compact structure, stable operation and long service life.

　　 Three, the jaw type electromagnetic clutch has high working reliability, low noise when closing, and small structure size. The magnetic clutch is selected to realize the closing and disconnecting of the transmission chain of the rocker arm drive device, so that the overall structure of the rocker arm drive device is small, the performance is reliable, and the operation is stable.

　　 Fourth, the base, rocker arm, sliding table guide rail, rocker arm drive device housing and other parts are all welded structure, so that the device manufacturing cost is low and the production cycle is short.

Machine introduction: Adopt dedicated control system, machine movement is stable. It has manual, automatic, and intuitive display functions for setting and changing programs, which is suitable for high-speed mass production.

Machine features:

The machine is beautiful and exquisite in appearance, providing the largest bending space

Using single-chip microcomputer to control the angle-mode man-machine dialogue operation, convenient and flexible

The bending angle adopts encoder to track and feedback information, and the bending angle has high accuracy

Store multiple groups of processing modes, flexible switching between programs of different specifications

With automatic memory number and power failure memory function

Accessories hydraulic cooling system to ensure long-term stable operation of the machine

Suitable industry:

Auto parts (brake hose, bumper, muffler, seat).

Motorcycle Manufacturing, Bicycle Industry, Fitness Equipment,

Air conditioning and refrigeration, steel furniture, bathroom equipment and other industries

The main technical parameters:

Maximum bending capacity (mm) Φ38.1×2

Bending radius range (mm) 25-180

Maximum bending angle (°) 200

Effective core length (mm) 1800

Main motor power (Kw) 4

Rated working pressure Mpa 12

Machine dimensions (mm) 2900×800×1000

Machine weight (kg) 1000

With the advancement and development of pipeline technology, the transportation of crude oil and refined oil in our country has been transformed from the transportation of trains and automobiles to the transportation of long-distance oil and gas pipelines. In the process of laying oil pipelines, it is often necessary to simmer the pipe due to hitting dead ends or bypassing obstacles. Therefore, in the field construction, the simmering pipe is mostly cold simmered by a china tube bending machine. In the past, most of our pipe bending machines were imported, but imported cnc pipe bending machines had many disadvantages, such as high cost and untimely supply of spare parts, which severely restricted the company's pipeline construction production capacity. In industrial production, the long U pipe bending machine is an important equipment in the production of air conditioners. It is a numerical control machine integrating straightening, rounding, feeding, cutting, bending and forming functions.

The traditional tube bending machine has a long design cycle, high cost, and inconvenient design modification. The main reason is that the process of analysis, testing, and modification faces a physical prototype; the design method based on virtual prototype technology is a three-dimensional Based on the digital model, combined with the relevant principles of CAE to carry out related performance research on the digital model, the test object is transferred from the physical prototype to the virtual prototype, thus shortening the design cycle and reducing the cost.

　　 As a new technology in the development and design of pipe bending machines, virtual prototype is a revolution to traditional design methods. Taking the required development of a CNC pipe bender that can bend seven copper tubes at the same time as the research object, a three-dimensional digital model of the pipe bender is established, and the virtual prototype technology is used innovatively to carry out the static and dynamic performance Analyze and apply the results of the analysis to guide the design.

The related aspects of the virtual prototype technology in the design and development process of the TBLU7 CNC pipe bending machine were discussed: including the establishment of the virtual prototype model of the TBLU7 pipe bending machine in UG, and the research and summary of the data between UG and CAE software ANSYS Exchange technology, conducted statics research on the main parts of the tube bending machine, analyzed the dynamic performance of important parts and the whole machine, and verified whether the designed pipe bender meets the technical requirements through the finite element analysis of the pipe bending simulation results .

　　In the research process of the automatic pipe bending machine the following work has been mainly completed:

　　 1. Firstly, it introduces the basic theoretical framework of virtual prototype technology, reviews the research status and development trend of this aspect at home and abroad, and demonstrates the necessity of applying virtual prototype technology to the design of automatic tube bending machine.

　　 Second, the virtual prototype model of the part was established in UG and assembled, and the interference analysis and evaluation were performed, and the virtual prototype of the whole machine was established.

　　3. Based on the established virtual prototype model, it was imported into the finite element analysis software ANSYS in a data exchange format for static analysis and optimization of some parts.

　　Four. Based on the established virtual prototype model, conduct modal analysis of the whole machine to improve its dynamic performance.

　　 5. Combining the theory of pipe bending and forming, the finite element method is used to simulate the bending of the pipe, and the results of the bending simulation are analyzed to verify whether the design meets the technical requirements.

The Induction Heating Pipe Bending Machine has an automatic lubrication function in the pipe. The required bending lubricating oil is automatically injected into the pipe before each bending, which can improve the bending quality, increase the life of the mold, and simplify manual procedures.

　　The Induction Heating Pipe Bending Machine has a standard guide mold auxiliary push device, and is designed with independent pressure and speed adjustment knobs, which can easily adjust the needs of pipe bending, which can make the normal thick and heavy, high-difficulty bending work easy. Such as bending of stainless steel pipes with smaller bending radius or bending of heavy pipes. The high-rigidity mechanical structure design and precision craftsmanship that conform to the principle of dynamic mechanics. With both structural strength, the simple crank and bending head design provides the largest bending space and minimizes the interference range of the machine. The structure is stable when bending, and relatively difficult bending work can be easily achieved, with high stability in use and long operating life.

Induction Heating Pipe Bending Machine material: stainless steel, pipe thickness: 3.5 (mm), radius of curvature: 101.6 (mm), model: A100TNCB, weight: 4500 (kg):, NC single-axis hydraulic automatic pipe bender, with PLC controller 10 kinds of bending angles can be edited and stored for automatic bending.

　　The intermediate frequency pipe bending mechanism adopts a joint-type locking design. Compared with the simple hydraulic cylinder push design, it can ensure a larger clamping force, and the bending quality is uniform and excellent. The Induction Heating Pipe Bending Machine has the function of slowly retracting the center. The retreat action time of the center penetration in the tube can be set according to the program, which can avoid the appearance of the tube raised by the fixed position of the penetration in the tube and improve the appearance quality of the tube.

There are many different pipe bending processes in practice, and there are many different automatic pipe bending machine mold classifications from different perspectives. In engineering, the bending is usually divided into cold bending and hot bending according to whether the pipe is heated or not. According to whether there is filler during bending, it is divided into cored bend and coreless bend. Copper pipes, especially thin-walled copper pipes, are bent by cold bending. law. The cold bending method is to bend the pipe into shape at room temperature. Since the pipe does not need to be heated, it is more suitable for bending stainless steel pipes, aluminum pipes and copper pipes. Commonly used cold bending methods include roll bending, stretch-wound bending, push-wound bending and pressure bending, etc. Now we mainly introduce the related problems of tube fittings in stretch-wound bending. In general, the bending radius of cold bending should not be less than 1.5 times the pipe diameter. Because the tube has a certain degree of elasticity, when the external force applied during bending is eliminated, the tube will bounce back to an angle, and the tube bender mold must have a certain amount of bending during bending. The amount of springback is related to the mechanical properties, wall thickness and bending radius of the pipe material. Generally, the springback angle of copper pipes is about 2 to 4 when bending. Stretch bending is to clamp the pipe on the pipe bending machine mold and rotate with the pipe bending mold. When the pipe is pulled through the pressure block, the pressure block will bend the pipe on the bending mold, which belongs to the forming mold bending process.

      With the development of the CNC machine tool industry, the use of advanced CNC pipe bending machine tools, equipped with reliable and accurate pipe bending machine molds to achieve the bending process can greatly improve production efficiency and ensure product quality. As the process parameters can be adjusted conveniently, the CNC pipe bending machine can accurately and stably complete the straightening, rounding, feeding, bending and other actions, ensuring the bending accuracy of the control parts. However, the quality of bent copper pipes is more sensitive to process parameters, so there is sufficient preliminary preparation and trial production for the requirements, especially for bending thin-walled copper pipes. If the process parameters of the pipe bender die are not properly selected, it is prone to wrinkles. , Resulting in scrapped parts. How to efficiently and accurately obtain these process parameters and fully guarantee the quality of the bending products is the research hotspot of CNC bending technology. In draw-winding, the position of the core rod relative to the bending point is very important. The core rod advances a certain position relative to the bending point (the working end of the core rod enters the bending section of the tube) although the ellipticity can be reduced, but when the core rod is too advanced The tube wall thinning will increase in a long time, so the position of the mandrel should be determined after 3 to 4 samples are bent. In addition, the core rod must move backwards when bending thick-walled tubes, and the core rod must move forwards when bending thin-walled tubes.

The difference between the elbow machine and the pipe bending machine is: the common point of the elbow machine and the tube bending machine is that both can produce carbon steel and alloy steel. The wall thickness of the elbow machine and the pipe bending machine is 3mm-120mm, the diameter of the elbow is 21-1620mm, and the diameter of the elbow is 21-1620mm. The above are the similarities between the elbow machine and the pipe bending machine.

The difference between the elbow machine and the induction pipe bending machine: the elbow machine is mainly a multi-brake coil in the production process, and the pipe bending machine uses a brake coil in the production process. When pushing the elbow, the elbow machine slowly passes through the multi-brake coil to form. In the process of production modification, the pipe bender is slowly bent into a shape through a brake coil plus a pipe bend rocker placed at the front. This is the difference between the pipe bending machine and the elbow machine.

The working principle of the induction heating pipe bending machine is to use an intermediate frequency power supply to heat the steel pipe and at the same time advance the steel pipe at a uniform speed, so that the steel pipe of the heating part walks along a preset track to form a bend with a certain radius of curvature and angle.

First install the steel pipe in place, adjust the bending radius through the lead screw nut transmission device on the rocker arm slewing device, and use the intermediate frequency induction heating coil to heat the steel pipe to a certain temperature before bending. When bending, the hydraulic pressure is used as the power, and the car will The steel pipe is pushed forward, and the platform has four waist wheels to clamp the steel pipe. It deforms and bends at the heating place along the adjusted bending radius. After the steel pipe is deformed, water is sprayed to cool it, so as to obtain the required elbow fittings.

In order to prevent the ellipse of the steel pipe after heating, the induction heating pipe bender pre-deforms the steel pipe before heating.

Induction tube bending technology was first introduced to the market in the 1960s. The use of high-frequency induction heating to achieve the highly sought-after precise control of steel tube bending provides faster and more robust results for many industries. This tube bending technology is immediately available on the market Had an impact.

       Since then, with improvements in shape and size, as well as advancements in the ability to bend with small radii, induction bending technology has developed significantly. The bending process is continuous and highly automated from beginning to end. Through these improvements, the heating and cooling conditions of narrow-section steel pipes can be precisely controlled to ensure a more stable quality and shape.

       The latest CAD technology allows the use of multiple curves in the structure, so that various structures can be freely designed and created, such as pedestrian bridges, bridge foot arches, stadium roof beams, railway stations, sports/recreation halls, educational institutions and community facilities, etc. .

       Induction bending technology is used in various industries and has advantages over cold bending, including extremely precise processing of hot bending, ensuring that any springback that affects the bending radius and angle can be minimized to ensure stable dimensional accuracy; free forming processing, no need Bending mold, processing any bending radius or angle; small radius bending of steel pipe.

       The induction bending technology is preferred because the use of elbows instead of elbows can reduce labor costs in factory pipeline construction, while reducing the number of welds required, thereby reducing welding and inspection costs. The pipeline quality has also been improved, because most of the pipeline defects are related to welds.

        Today's induction bending technology ensures that the manufacture of pipes meets all required application specifications, and fully considers the design and manufacture of materials.

        The advancement of induction tube technology has improved the material strength characteristics of the elbow; the use of high-strength steel to develop high-grade elbows for thin-walled high-strength products; and the improvement of the bending process.

1) This process can avoid the uneven wall thickness of the elbow caused by the convex edge of the pipe wall being stretched and thinned, and the concave edge of the pipe wall being compressed and thickened when the traditional pipe bending process is formed.

2) Using this process, a small radius (R≈D) and thin-walled (t/D≈0.015) 180 elbow with uniform wall thickness can be produced, which cannot be achieved by other pipe bending processes.

3) If the design of various process parameters is reasonable, the process can ensure that the wall thickness of each part of the tube bend is always kept constant during the forming process, that is, it is always equal to the wall thickness of the straight tube blank before deformation.

4) By using this process, bends with the same diameter of 45°, 90°, 180° and other bending angles can be produced on the same horn mandrel at one time, and the production efficiency is high.

1. The induction elbow adopts the power supply with vertical external characteristics, and adopts the positive polarity when DC (the welding wire is connected to the negative electrode)

2. Intermediate frequency elbows are generally suitable for welding thin plates below 6mm, with the characteristics of beautiful weld formation and small welding deformation

3. The shielding gas is argon with a purity of 99.99%. When the welding current is 50~50A, the argon flow is 8~0L/min, when the current is 50~250A, the argon flow is 2~5L/min.

4. For welding arc length, 2~4mm is better when welding ordinary steel, and ~3mm is better when welding stainless steel. If it is too long, the protection effect will not be good.

5. In order to prevent the appearance of welding pores, the induction elbow must be cleaned up if there is rust and oil stains on the welding part.

6. The protruding length of the tungsten electrode from the gas nozzle is preferably 4~5mm, 2~3mm for fillet welding and other places with poor shielding, and 5~6mm for deep grooves. The distance from the nozzle to the work is generally not More than 5mm.

7. In order to prevent the back side of the bottom weld bead from being oxidized, the back side also needs to be protected by gas.

8. Windproof and ventilation. In windy places, be sure to take measures to block the net, while indoors should take appropriate ventilation measures.

9. In order to protect the welding pool with argon gas and facilitate the welding operation, the induction elbow should generally maintain an angle of 80~85° between the center line of the tungsten electrode and the workpiece at the welding point, and the angle between the filler wire and the surface of the workpiece should be as much as possible The ground is small, generally around 0°.

Features of China induction heating pipe bending machine

1) This process can avoid the uneven wall thickness of the elbow caused by the convex edge of the pipe wall being stretched and thinned, and the concave edge of the pipe wall being compressed and thickened when the traditional pipe bending process is formed.

  2) Using this process, a small radius (R≈D) and thin wall (t/D≈0.015) 180 elbow with uniform wall thickness can be produced, which is not possible with other bending processes.

  3) If the design of various process parameters is reasonable, the process can ensure that the wall thickness of each part of the tube bend is always kept constant during the forming process, that is, it is always equal to the wall thickness of the straight tube blank before deformation.

  4) With this process, bends with the same diameter of 45°, 90°, 180° and other bending angles can be produced on the same horn mandrel at one time, and the production efficiency is high.