News #tube bending machine

The working principle of the elbow of China single head cnc pipe bending machine is shown in the figure: The elbow mold is fixed on the main shaft and rotates with the main shaft. The movable auxiliary guiding material chute is closely attached to the curved outer side of the tube blank. When the bending tube mold is rotated by an angle, the tube is wound around the circumferential direction of the bending tube mold, and the rotation angle of the bending tube mold is the bending angle. The three-dimensional multi-bend of the same radius realized on one pipe member mainly has three major actions of linear feeding, space rotating pipe and elbow, that is, after completing a bending, the pipe is sent to the next bending position and rotated through a space angle. Then proceed to the next bend to obtain a space bend with the same bend radius. The bending mode determines the bending radius. The pipe is fixed on the clamping groove of the fan-shaped bending die by the clamping die. The numerical control pipe bending machine is mainly composed of three parts: a mechanical part, a hydraulic system and a PLC control system. The mechanical part mainly consists of a pipe clamping device, a bending pipe transmission device, a boosting device, a bed body and a bending pipe mold.
The design and manufacturing level of power station boilers has been improved from time to time, with the rapid development of China's power industry. New furnace types are constantly appearing. The demand for the number and specifications of various curved molded pipe fittings in the boiler manufacturing industry is increasing from time to time. The patterns are refurbished from time to time, and higher requirements are placed on the accuracy of the pipe bending and the quality of the exterior. When the old design single head cnc pipe bending machine is processed, it can only complete one bending at a time, often loading and unloading, and the production efficiency is low, and the simultaneous improvement of the output and the quality cannot be achieved. The application of PLC single head hydraulic pipe bending machine control system overcomes the defects that the relay contact control system is susceptible to environmental interference, high failure rate and difficult maintenance. In addition, you only need to modify the software to adapt to the changes in the new process requirements.

The high-performance medium-sized pipe bender used in single head hydraulic cnc pipe bending machine is used in shipbuilding, boiler, truck transportation, and general engineering piping, etc.
High performance small pipe benders are suitable for mass production or standardization of products, such as steam, locomotive and other parts, such as exhaust pipes, cushions, bumper all the iron pipe furniture, etc.
Performance of uni-axial hydraulic pipe bender:
1, the nose and elbow are exquisitely designed to provide maximum elbow space.
2, PLC control, dialogue input.
3, the large capacity cooling circulation system makes the machine running more stable.
4, with manual, automatic, half cycle, full cycle and other functions of arbitrary choice.
5, slow positioning function, repeat ability accuracy of 0.1.
6, mold replacement is simple and convenient, easy to flexible production.
7, mobile foot switch, with automatic start, emergency stop, emergency continue to three functions, high safety.

1. The China CNC pipe bending machine must be well grounded, and the wire must not be less than 4mm2 copper cord. It is not allowed to access the power supply voltage exceeding the specified range. The plug-in cannot be plugged in. The control loop cannot be tested with a meg-ohmmeter, otherwise the device may be damaged.
2. When plugging or unplugging the connector, the wire or cable cannot be pulled to prevent the solder from pulling off.
3, proximity switches, encoders, etc. can not be hit with hard objects.
4. You cannot use a sharp object to collide with the display unit.
5. The electrical box must be placed in a ventilated place, and it is forbidden to work in dust and corrosive gases.
6, can not be installed and changed to PC input and output.
7. The motor steering must be reconfirmed when changing the power of the bender.
8. The pipe bending machine should be kept clean. In particular, it should be noted that there should be no foreign objects in the sliding grooves such as clamping blocks and sliders.
9. Regularly add lubricant to the chain and other sliding parts.
10. The power must be disconnected during cleaning and maintenance.

1. When cnc pipe bending machine is purely bent, the outer tension of the neutral layer of the elbow is thinned under the influence of the external force, and the inner pressure is thickened by the action of this, and the cross section of the pipe is due to the resultant force. A change has occurred, causing a drop in the quality of the bend.
2. When the elbow is bent, the outer tensile force becomes thicker and the inner pressure becomes thinner. The orientation and the way of bending are different. In the process of compression and bending, the neutral axis is at a third of the distance from the outer wall. When working in the cornering, the neutral axis is at two-thirds of the distance from the outer wall. It can be seen that the use of the method of turning is beneficial for bending thin-walled pipes.
3, the accuracy of the bending tire is one of the reasons that can directly determine the quality of the bending tube, when making the bending tire, the size must be controlled within the specified range.
4. There are two reasons for the impact on the quality of the bent pipe: the bending property of the bent pipe itself, and the degree of corrosion of the curved pipe surface. At the time of operation, the staff must first know which raw materials are processed, and have an understanding of the processing performance, especially the degree of corrosion of the surface.

In recent years, cnc pipe bending machine are more and more widely used in the processing of fine pipe fittings, the use of more and more ordinary, which puts forward higher requirements for the accuracy of single head cnc pipe bending machine. So in recent years, this problem has been recognized and valued by more and more people.
(1) reduce the roughness of the workpiece's outer wall.
The surface roughness of the outer wall of the workpiece is related to the surface roughness of the ring groove on the bender wheel, and also to the nature and quality of the pipe. In order to make the workpiece look smoother after machining, the roughness of the outer surface of the bending metal pipe can be guaranteed to meet the requirements of the index as long as proper lubricating oil is applied to the surface of the ring groove on the wheel to reduce the friction between the contacting surfaces during operation.
(2) tube section shape accuracy
The accuracy of pipe section shape depends on the assembly accuracy of pipe bender and the shape accuracy of ring groove on the processing wheel and the reverse deformation wheel. As long as the operator guarantees the position accuracy of the two annular grooves formed on the assembled pipe bender and keeps enough dimension allowance according to the principle of elastic-plastic deformation of materials, the higher section shape accuracy of the pipe can be obtained.
(3) ensure the error limit of bending arc length of pipes.
According to the design drawings of the workpiece, the bending arc length of the metal pipe should be controlled within the precision range specified in the drawings.

1. The automatic cnc pipe bending machine adjusts the speed of the electric automatic pipe bending machine according to the thickness of the pipe material to ensure the normal outflow of water and emulsified oil, and protects the saw blade.
2. Turn on the power switch of the workshop to check whether the machine is normal, whether the protective cover is installed, and whether the installation is firm.
3. When installing the electric pipe cutter saw blade, the sawtooth is in the correct direction, the saw blade should be rotated counterclockwise to the correct direction, and then locked with a fixing nut.
4. According to the size of the saw blade and the thickness of the pipe material, the stroke of the automatic pipe bending machine blade is debugged. The saw tooth is 12 mm from the upper plane of the workpiece when the workpiece is stopped. After the workpiece is cut, the saw tooth is about 5 mm from the lower plane of the workpiece.
5. Run the empty machine for 1-2 minutes. After confirming the normal condition, lock the positioning device according to the fixed length requirement of the workpiece, and then feed the pipe material into the fully automatic pipe bending machine with the pitch adjusted so that the front end of the pipe material is flush with the positioning device. Then clamp the workpiece by hand clamping, operate the machine to cut, after cutting the workpiece, the machine should be returned to the original position, and the intermittent inspection should be carried out according to the specified time or quantity to meet the requirements of the drawings.
 
1. Surface pretreatment: The surface oxide scale and other impurities are removed by sand blasting, and the outer surface of the elbow is up to the standard Sa2 grade.
2. Non-destructive testing:
1) 100% UT or RT inspection is performed on each elbow weld, and RT inspection is performed on the repair of the weld. Meet the standards.
2) After the preparation of the groove, the 100mm length welds from the entire nozzle and the nozzle are subjected to magnetic powder or penetration test, and the grade I is qualified.
3) Each curved tube has a 90° arc surface on both sides of the outer arc for magnetic powder or penetration detection, and the depth of the defect is not more than 5% of the wall thickness.
4) For the pipe body within ±45° of the neutral surface of the outer arc of each elbow with a substantially constant wall thickness, the transverse crack defect is checked by UT.
5) According to SY/T6423.5 or SY/T6423.6, the curve of the elbow is tested in accordance with the standard.
6) Remanence: Check and degauss according to relevant regulations, no more than 15Gs.
3, visual inspection:
1) There is no crack, overheating, overburning; there is no hard spot on the surface;
2) Whether the inner and outer surfaces are smooth, with sharp notches, delamination, nicks, scabs, cracks, folds, tears, cracks, cracks and other defects.
3) It is not allowed to have a pit with a depth of more than 3.15mm or a pit with a depth of more than 1.5mm on the weld. It is not allowed to repair the dent by means of slamming.

The installation process of the pipeline involves many techniques. In the pipeline installation project, a large number of bends of various angles are required, such as 90° and 45° bends, B-shaped bends (back and forth bends), and bends (curved bends). , square telescopic device, etc., according to the conditions of the construction site and the diameter of the pipe diameter to select the processing equipment and the corresponding construction process, can be processed on-site, or can be shaped in the bending machine processing plant.

Machines required for pipeline installation: manual pipe bender, pulley bender, electric or hydraulic pipe bending machine, fully automatic cnc pipe bending machine, hair dryer, mold, steel ruler, oven, work table, acetylene generator, welding and cutting tools, etc. . Bending conditions: The construction drawing, standard drawing, and review have been completed. (There are construction sites and workbench that meet the safety requirements. The pipes with the certificate of conformity are all entered into the site.

Technical delivery has been carried out, familiar with the specifications, dimensions, angles of various processing parts, and compiled material cards. When using a manual bender to bend, the operator's face must avoid the bent steel pipe, so as to prevent the bender from slipping and hurting people. When using fire to bend, it is forbidden to stand at the mouth of the pipe to prevent the gun from injuring people. The location of the coal stove should be in good contact with the fire department. The flammable materials must be eliminated. The fire must be extinguished before work to prevent accidents. The acetylene generator must be equipped with a safety device to prevent tempering. The fuses, oxygen cylinders, oxygen meters and welding and cutting tools are strictly prohibited from being contaminated with grease. The oxygen cylinders should have anti-vibration rubber rings.

The single head hydraulic cnc pipe bending machine could be a new elbow tool with elbow perform and lifting perform. you'll be able to bend all types of pipes to the situation you would like to attain. The pipe bender has several blessings, like cheap structure, safe use, convenient operation, cheap worth, quick loading and unloading, multi-purpose and thus on. It occupies an over-sized share within the domestic market of hydraulic pipe bending machine.
1. The working rule and general structure of cnc pipe bending machine, single head pipe bending machine is usually composed of an electrical pump, a aggressive oil pipe, a fast connection, a operating oil cylinder, a plunger, a pipe bending element (including the higher flower plate, the lower flower plate, a die, a roller shaft). The aggressive oil output from the electrical pump is fed into the operating cylinder through the aggressive oil pipe. The aggressive oil pushes the plunger within the operating cylinder to provide thrust and bends the pipe through the elbow elements.
2. Hydraulic pipe bending machine are appropriate for piping and repairing in factories, warehouses, wharf, buildings, railways, cars, etc. Besides the perform of bending pipe, it also can unload the bending pipe element (cylinder) as a separate hydraulic lifting machine.

1, stainless steel pipe bending machine can be roughly divided into CNC pipe bending machine, hydraulic pipe bending machine and so on.
2, according to the operation mode can be divided into automatic pipe bending machine, semi-automatic pipe bending machine, manual pipe bending machine.
3. It is mainly used for electric power construction, public railway construction, pipeline laying and repair of boilers, bridges, ships, furniture, decoration, etc. It has many advantages such as multi-function, reasonable structure and simple operation.
4. In addition to the curved pipe function, the hydraulic pipe bending machine can also use the oil cylinder as a hydraulic jack.

The mechanism of the hydraulic automatic cnc pipe bending machine may be a power supply. It is mainly used to provide hydraulic control for the automatic pipe bending machine to control the pressure oil and adjust the displacement of the main pump. Once the hydraulic system is improperly adjusted, there will be serious consequences. Too high or too low will not work.
If the pressure of the hydraulic automatic pipe bender is too high, the hydraulic pump will operate at a pressure exceeding the rated pressure, causing the pump to overload, resulting in an increase in oil temperature.
If the pressure of the hydraulic automatic pipe bending machine system is too low, the working mechanism will frequently open and unload the overflow valve under normal load, which will cause the hydraulic system to overflow and generate heat.
The error derivation formula caused by the differential pressure transmitter of the automatic pipe bending machine shows that the main reason is due to the existence of the height difference when the differential pressure is calculated, that is, H≠0. In order to eliminate the existence of H, the two pressure points of the elbow sensor are required to be in the same horizontal plane. That is to say, in principle, a horizontal arrangement scheme may be adopted. However, when the horizontal scheme cannot be adopted, the length of the differential pressure pipeline and the online real-time compensation scheme should be shortened.
In the discussion of the formula of the radius of curvature ratio caused by thermal expansion, it can be known that when L1=L2, the deviation length of R' and R is the smallest, that is, it is required to make the lengths of straight pipes on both sides of the elbow as equal as possible. In addition, in order to reduce the concentration of stress in the pipeline at the elbow flow-meter, the method of dividing the elongation may be adopted, that is, separately setting the expansion joint or considering the length of the elbow flow-meter on both sides of the elbow flow-meter. π type installation method.
The fluid flowing through the elbow generates a centripetal acceleration motion due to the centripetal force exerted by the tube wall, forming an overall spatial rotational flow. (Flow State Expression) The intensity of the flow centripetal acceleration motion is characterized by the centripetal acceleration of the fluid and can be determined by measuring the fluid differential pressure signal inside and outside the elbow. Under the condition that the bending diameter ratio (bending degree) and the density of the fluid medium are known, the flow rate can be calculated by the formula when the differential pressure between the inner and outer diameters is measured.

How to solve the deviation and angle inaccuracy of pipe bending machine bending process. With the long time of use of pipe bending machine and hydraulic drive type hydraulic pipe bending machine, some mechanical parts begin to age, so we must have certain equipment for our pipe bending machine. In order to understand the reasons for the disassembly analysis. Generally, there is a deviation in the angle of the elbow. First, we should check whether the elbow angle controller of our bender, the encoder is damaged, and whether it is loose. After eliminating the encoder problem, we are checking whether the elbow arm is rubbed. Deviation of the elbow, and whether the oil temperature is too high, the bending speed is not uniform and the solenoid valve cannot control the oil pressure well.

During the machining method of the CNC pipe bending machine, thanks to the comparison of the heating speed, the mould cannot get an identical heating impact, in order that an outsized temperature distinction is definitely generated, that is that the main reason for the strain generation and variation. Once there's profit within the mould, it's susceptible to deformation.
It may be seen that it's doable to avoid the incidence of deformation solely by making certain that the pipe bending machine mould is heated uniformly. the foremost necessary issue is to regulate the heating rate and temperature adjustment in order that the mould features a sensible heat treatment impact, in order that the chance of deformation throughout use is additionally reduced.