Little benders! CNC pipe bending equipment introduction details

Pipe bending machine is mainly used in electric power construction, boiler, bridge, ship, furniture, decoration and other steel pipe bending, with multiple functions, reasonable structure, simple operation and other advantages. In addition to the function of pipe bending, the machine can also use the cylinder as a hydraulic jack. Compared with CNC pipe bending equipment, it has the characteristics of cheap price and convenient use, and occupies the leading product position in the domestic pipe bending machine market.

Machine classification

According to the power type classification: hydraulic pipe bender, electric platform pipe bender, pneumatic pipe bender, manual pipe bender, etc.

According to the control mode classification: CNC pipe bending machine, semi-automatic pipe bending machine, automatic pipe bending machine, etc.

According to the type of work: single-head pipe bender, double-head pipe bender, multi-head pipe bender, etc. 

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The structural characteristics

1. Pipe bending machine adopts touch screen plus NUMERICAL control module, dialogue operation, simple and easy program setting;

2. The bed structure is stable and not easy to deform;

3. 16 elbow angles can be set for each gear, and 16 groups of files can be stored in memory;

4. Slow positioning function, stable bending Angle, repetition accuracy up to ±0.1°;

5. Error messages are displayed on the screen to help the operator eliminate them immediately;

6. Provide self-developed coordinate conversion bending processing value, software can be installed on the desktop computer editing calculation. ‍

Process characteristics

The pipe bender bends the pipe as well as the sheet. In the case of pure bending, when the pipe with outer diameter D and wall thickness T is bent under the action of external moment M, the outer pipe wall of the neutral layer is subjected to tensile stress σ1, and the pipe wall becomes thinner. The tube wall inside the neutral layer is thickened by tensile stress σ1. In addition, the shape of the cross section changes from round to approximately oval due to the effect of the resultant force F1 and F2. When the deformation is too large, cracks will occur on the outer wall of the pipe, and wrinkling will occur on the inner wall of the pipe.

The deformation degree of pipe depends on the value of relative bending radius R/D and relative thickness T /D. The smaller R/D and T /D values are, the greater the deformation degree is. In order to ensure the forming quality of pipe fittings, the deformation degree must be controlled within the permitted range. The bending forming limit of pipe fittings depends not only on the mechanical properties of materials and bending methods, but also on the application requirements of pipe fittings. The forming limit of pipe fittings should include the following contents:

1. The maximum elongation deformation in the tensile deformation zone outside the neutral layer does not exceed the plastic allowable value of the material and cause rupture;

2. In the compression deformation zone inside the neutral layer, the thin-walled structure under the action of tangential compressive stress should not be wrinkled due to instability;

3. If the pipe has the requirement of ellipticity, control the distortion of its section;

4. Control the forming limit of wall thinning if the pipe fittings have the strength requirement to withstand internal pressure. ‍

Method of use

1. Refer to the operation manual of electric oil pump.

2. First screw the working cylinder into the inner thread of the square baffle block, so that the wheel mounted on the bracket at the back end of the cylinder is downward.

3. Choose according to bend the pipe by the outer diameter of the die, the fortress, set the column will be two roll groove which corresponds to the die, and then in the corresponding size of the plate hole, then the cover plate, the curved pipe inserted into the slot, and then the quick joint activities section of the high pressure oil pipe end back and set on the joint of working cylinder, electric oil pump on the oil drain screw tightening, can bend. After bending, loosen the drain screw and the plunger will reset automatically. ‍

Matters needing attention

1. Refer to the operation manual of electric oil pump.

2. Do not unload the quick connector when there is load.

3. The machine is oil as the medium, must do a good job of cleaning and maintenance of the oil and the machine, so as to avoid blockage or oil leakage, affecting the use effect.

Operation process

1. Pipe type regularization: excessive arcs, arbitrary curves, compound bends and more than 180 should be avoided when designing and arranging pipes. The circular arc. The large arc not only makes the tooling bulky, but also is limited by the size of the pipe bender machine. Arbitrary curve, composite bending design shape is very unreasonable, greatly hindered mechanization, automatic production, so that the operator is difficult to get rid of heavy physical labor; More than 180. The arc makes the bending machine unable to discharge the mold.

2. Standardization of bending radius: bending radius should try to achieve "one tube with one mold" and "multiple tubes with one mold". For a pipe, no matter how many bends there are, the bending radius can only be one, because the pipe bender does not change modules in the bending process, which is "one pipe one mold". And "multi-pipe and one-mold", that is, the tubes of the same diameter should adopt the same bending radius as far as possible, that is, the same set of modules should be used to bend tubes of different shapes, so as to reduce the number of modules.

3. Bending radius: the size of the bending radius of the catheter determines the resistance of the catheter during bending and forming. Generally speaking, the pipe diameter is large and the bending radius is small, so it is easy to wrinkle and slip when bending, and the bending quality is difficult to guarantee. Therefore, it is better to choose the R value of the bending mold as 23 times the diameter of the pipe.

4. Bending forming speed: the main influence of bending forming speed on forming quality is: the speed is too fast, easy to cause the flattening of the bending part of the catheter, roundness can not meet the requirements, resulting in the cracking and breaking of the catheter; If the speed is too slow, it is easy to cause wrinkling of the pipe and slipping of the compression block, and the pipe with large diameter is easy to form subsidence of the bending part of the pipe. In view of the large number of tests on the two CNC pipe bending machines, it is advisable to determine the bending speed of the pipe as 20%-40% of the maximum bending speed of the machine.

5. Mandrel and its position: The mandrel mainly supports the inner wall of the bending radius of the conduit to prevent its deformation during bending. It is difficult to ensure the quality of domestic pipe without mandrel when bending on machine tool. There are many forms of mandrel, such as column mandrel, universal single, double, three, four ball head mandrel, directional single, multi-ball head mandrel and so on. In addition, the position of the mandrel also has a certain influence on the bending forming of the pipe: theoretically, its tangent line should be even with the tangent line of the bending die, but through a large number of tests, it is better to advance 1 ~ 2mm, then the quality of the bending pipe is ideal. Of course, too much lead, will cause bending part of the outer wall of the so-called "goose head" phenomenon. ‍ ‍

Before operating

1. The machine must be well grounded, and the lead shall not be less than 4mm copper cord. Do not access the power supply voltage exceeding the specified range, do not plug plug-in live, do not use megohm meter to test the control loop, otherwise the device may be damaged.

2. Do not pull out the wire or cable when inserting and removing the plug-in to prevent the welding from pulling out.

3. Proximity switches and encoders cannot be hit with hard objects.

4. Do not hit the display unit with sharp objects.

5. The electrical box must be placed in a ventilated place. Do not work in dust and corrosive gas.

6. Do not install or change the PC INPUT and output terminals without permission.

7. Reconfirm the motor steering when changing the power supply of the machine tool.

8. The machine should be kept clean, and special attention should be paid to no foreign matter in the sliding groove such as clamping block and slide block.

9. Regularly add lubricating oil to the chain and other sliding parts.

10. The power supply must be disconnected during cleaning and maintenance.

11. Preparation before starting: check whether the oil level of the oil tank is at the oil level line, refueling at each lubrication point, confirm the motor turning after starting up, check whether there is any abnormal sound of the oil pump, and check whether there is oil leakage in the hydraulic system after starting up (refueling is not allowed when the Angle encoder is in position).

12. Pressure adjustment: the electromagnetic relief valve is used to adjust the pressure to ensure that the system pressure reaches the required working pressure, generally not higher than 12.5mpa.

13. Mold adjustment: mold installation, mold and clamping block to center, clamping block can be adjusted by bolts; The booster block and the mold center, the booster block is adjustable; Core head and mold center, loosen the core head frame bolt, adjust the center after tightening the bolt. ‍

After the operation

1. Cut off the power supply.

2. Clean and lubricate well. ‍