9 Tips You Have to Know About Tube Bending Machine

Tube bending machine is mainly used for electric power construction, boilers, bridges, ships, furniture, decoration and other steel pipe bending, with more functions, reasonable structure, simple operation and other advantages. The machine in addition to the bending function, but also the cylinder as a hydraulic jack use, compared to the CNC pipe bending equipment with cheap, easy to use characteristics of the dominant product position in the domestic Tube bending machine market.

According to the type of power classification: hydraulic Tube bending machine, electric platform bender, pneumatic Tube bending machine, manual Tube bending machine, etc.

Classified according to the control mode: CNC Tube bending machine, semi-automatic Tube bending machine, automatic Tube bending machine, etc.

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

Structural Characteristics

1. bender using touch screen plus CNC module, dialogue operation, easy to set the program.

2. The bed structure is solid, not easy to deform.

3. Each file can set 16 bending angle, and memory can be stored in 16 groups of files.

4. slow positioning function, bending angle stability, and repeat accuracy of ± 0.1 °.

5. error message displayed on the screen to help the operator to immediately eliminate it.

6. Provide self-developed coordinates to convert the bend processing value, the software can be installed in the desktop computer with optional editing calculations.

Process Characteristics

The Tube bender for pipe bending and sheet bending is the same. In the case of pure bending, the outer diameter of D, wall thickness of t tube bending by the action of the external moment M, the neutral layer of the outer wall of the tube is subject to tensile stress σ1 effect, the wall becomes thinner; the neutral layer of the inner wall of the tube is subject to tensile stress σ1 effect, the wall of the tube becomes thicker. And the shape of the cross-section changes from circular to nearly elliptical due to the combined forces F1 and F2. When the deformation is too large, the outer tube wall will be cracked and the inner tube wall will be wrinkled.

The degree of tube deformation depends on the size of the relative bending radius R/D and the relative thickness t/D. The smaller the values of R/D and t/D, the greater the degree of deformation. To ensure quality of pipe forming, must control the degree of deformation within the permitted range, pipe bending forming limit depends not only on the mechanical properties of the material and bending method, but also consider the use of pipe requirements. The forming limit of the pipe fittings should contain the following elements.

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

2. Neutral layer inside the compressive deformation zone, the thin-walled part of the structure subject to tangential compressive stress does not exceed the instability and wrinkling.

3. If the tube has the requirement of ellipticity, control its section to produce distortion.

4. If the tube has the strength requirement to withstand internal pressure, control the forming limit of the wall thickness reduction.

Use Method

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

2. The first work cylinder screwed into the internal threads of the square file block, so that the rear end of the cylinder mounted on the bracket wheels down.

3. According to the outer diameter of the bent pipe selection die, set on the plunger, the two rollers corresponding to the slot towards the die, and then into the corresponding size of the flower plate hole, and then the upper flower plate cover, the bent pipe into the slot, and then the high-pressure oil pipe end of the quick connector active part of the pull back and set on the working cylinder connector, the electric oil pump on the oil release screw screw tightened, you can bend the pipe. Bending is complete, relax the oil release screw, the plunger is automatically reset.

Caution

1. Refer to the electric oil pump instructions.

2. Do not remove the quick coupling when there is a load.

3. This machine is a medium with oil, must do a good job of oil and the cleaning and maintenance of the machine, so as not to block or leak oil, affecting the use of the effect.

Operation Process

1. Pipe type regularization: design and row of pipes to avoid excessive arc, arbitrary curves, compound bend and arc greater than 180. Too large arc not only makes the tooling bulky, and by the bender machine size restrictions; arbitrary curve, compound bend design is very unreasonable, greatly hindering mechanization, automated production, making it difficult for the operator to get rid of bulky manual labor; greater than 180. arc so that the bender can not unload the mold.

2. Bending radius standardization: bending radius to try to achieve "a tube a mold" and "more than one tube a mold. For a tube, regardless of how many bends, bending angle, the bending radius can only have a, because the bender does not replace the module in the bending process, which is "a tube a module. The "multi-pipe a module" is the same diameter specifications of the pipe should try to use the same bending radius, that is, the use of the same set of modules to bend different shapes of pipe shape, so as to help reduce the number of modules.

3. Bending radius: the size of the bending radius of the conduit determines the size of the resistance of the conduit in bending and forming. Generally speaking, the pipe diameter of the bending radius is small, bending is prone to internal wrinkles and slippage. Bending quality is difficult to ensure, so the general choice of bending die R value of 23 times the diameter of the pipe is good.

4. Bending and forming speed: bending and forming speed of the main impact on quality of forming: too fast, easy to cause the flattening of the bent part of the conduit, roundness can not meet the requirements, resulting in the pulling of the conduit cracking, pulling off; speed is too slow, easy to cause the conduit wrinkling and compression block slippage, large pipe diameter of the tube is easy to form the sagging of the bent part of the conduit. For the two CNC Tube bending machine on a large number of tests, bending speed of the conduit to determine maximum bending speed of the machine 20% - 40% is appropriate.

5. mandrel and its location: mandrel in the bending process mainly plays a role in supporting the inner wall of the bending radius of the conduit to prevent its deformation. Domestic pipe bending in the machine tool forming if not using the mandrel, its quality is difficult to ensure. There are many forms of mandrel, such as column mandrel, universal single, double, three, four ball head mandrel, directional single, multi-ball head mandrel, etc In addition, the location of the mandrel has a certain impact on the conduit bending and forming: theoretically, its tangent line should be flush with the tangent line of the bending die, but after a large number of tests have proved that 1 to 2 mm in advance is better, when the bending is more ideal. Of course, the amount of advance is too large, will cause the bending part of the outer wall of the so-called "goose head" phenomenon.

Operation Before

1 . The machine must be well grounded, the wire must not be less than 4 mm copper flexible wire. Do not allow access to more than the specified range of power supply voltage, can not plug and unplug plug-ins with electricity, can not test the control circuit with megohmmeter, otherwise it may damage the device.

2. When plugging and unplugging the plug-in, you can not pull the wire or cable to prevent welding from pulling off.

3. Proximity switches, encoders, etc. should not be hit by hard objects.

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

5. The electrical box must be placed in a ventilated place, forbidden to work in dust and corrosive gas.

6. Do not add, rewire the PC input and output.

7. When changing the machine power supply you must reconfirm the motor steering.

8. The machine should be kept clean, especially attention should be paid to the clamping block, slider and other sliding groove should not have foreign objects.

9. Regularly add lubricant to the chain and other sliding parts.

10. In the cleaning and maintenance must be disconnected from the power supply.

11. Preparation before driving: check whether the oil level of the oil tank to the oil level line, each lubrication point refueling, start the machine to confirm the motor steering, check the oil pump for abnormal sound, check the hydraulic system for oil leakage after starting the machine (angle encoder is not allowed to refuel).

12. Pressure adjustment: adjust pressure with electromagnetic relief valve to ensure that system pressure reaches required working pressure, generally not higher than 12.5Mpa.

13. mold adjustment: mold installation, the requirements of the mold and clamping block to the center, clamping block available bolt adjustment; booster block and mold to the center, adjustable booster block; core head and mold to the center, loosen the core head frame bolts, adjust the center and tighten the bolts.

Operation

1. When the machine starts to pay attention to the human body, it shall not enter the rotating arm sweeping range.

2. When the machine is working, all personnel are not allowed to enter space swept by the rotating arm and the pipe.

3. Machine tool hydraulic system using YA-N32 ordinary hydraulic oil (original grade 20). Under normal circumstances, a year to replace the oil filter must be cleaned at the same time.

4. Adjust the machine tool (mold), the adjuster should press the button to adjust. Never one person in the machine to adjust, another person in the control cabinet operation.

5. Adjust the machine tool or open the empty car should remove the core rod.

6. Hydraulic system pressure should not be greater than 14Mpa.

7. Manual adjustment of speed of the side push cylinder rotating arm should be rotated to ≥ 900 when adjusting speed of the rotating arm to rotate the edge of the pipe bending mold line speed synchronization, prohibit in the manual state side pushing propulsion speed is greater than line speed of the edge of the rotating mold.

8. General machine should be checked after a period of time to check the degree of chain tightness and keep the upper and lower chain tightness consistent.

9. Automatic operation in the core bending mode, before the return of the bending arm, the operator must ensure that the core head inside the tube, or ensure that the core axis in the return of the bending arm is not blocked, otherwise, the core head or core rod may be bent or broken.

After Operation

1. Cut off the power supply.

2. Do the cleaning and lubrication work.