(1) punch wear too fast The main reason:
① mold gap is too small, the general Jian-Han mold the total gap for the material thickness of 20%, 25%.
② convex and concave mold on the neutral is not good, including the mold base and mold-oriented components and turret sets of inserts and other reasons for the lack of precision mold parts scarves bad.
③ punch temperature is too high, mainly due to the same die for a long time stamping punch overheating.
④ mold grinding method properly, resulting in die annealing, wear and tear increased.
⑤ local unilateral punching, such as nibbling, punching angle or shear, aluminum alloy doors and windows accessories side force will bias the side of the punch, the side of the gap decreases, resulting in serious mold wear, if the machine tool installation accuracy Not high, serious will punch partial over the mold, resulting in punch and die damage.
(2) mold with material problems
Die with material will cause waste to rebound, its related factors:
① the sharpness of the edge of the mold, the edge of a few rounded the greater the more likely to cause waste rebound.
② the amount of mold into the mold, the machine into the modulus of each of the host is a certain amount, the mold human modulus is small, likely to cause waste rebound. Mold up to people WeChat: mujudaren
③ mold space is reasonable, if the mold gap is not appropriate, likely to cause waste rebound.
④ sheet being processed and whether there is more oil.
⑤ spring fatigue damage.
To prevent the mold with the material method:
① use a special anti-material with die. Aluminum alloy doors and windows accessories
② mold often sharpened to maintain sharp, and demagnetization treatment.
③ increase die gap.
④ The use of oblique knife blade instead of flat blade mold.
⑤ mold installation back feeder.
⑥ reasonable increase in the amount of mold into the mold.
⑦ Check the fatigue strength of mold spring or unloading sleeve
(3) mold on the neutral problem
Mold in the use of towels prone to punch the location of the different side of the wear of different parts of some large scratches, wear faster, this situation in the narrow rectangular mold is particularly evident. The main reason for this problem:
① machine turret design or processing accuracy is insufficient.Mainly the upper and lower turntable Yun mold seat is not good for neutral.
② mold design or precision can not meet the requirements.
③ die punch guide sleeve precision is not enough.
④ mold gap selection inappropriate.
⑤ mold seat or mold guide sleeve wear caused by long-term use of the neutral bad.
To prevent mold wear inconsistencies should be:
① regular use of the core rod on the machine turret and mounting seat for neutral inspection and adjustment.
② timely replacement of die guide sleeve and use the appropriate gap of convex and concave mold.
③ full lead mold.
④ strengthen the responsibility of the operator, found in time to find the cause, to avoid greater losses.
(4) special molding tool to use
In order to meet the production needs, often need to use the forming mold or special mold, mainly bridge mold, shutter mold, Shen hole mold, turning hole tapping mold, convex mold, drawing mold, modular mold, the use of special or Forming die to increase production efficiency for everyone, but the foot forming mold prices are higher, usually 4-5 times the normal mold. Mold up to people WeChat: mujudaren To avoid mistakes, should pay attention to and follow the following principles:
① mold installation direction checks to ensure that the mold convexo-concave mold installation direction.
② According to the requirements of the correct adjustment of the stamping die depth, each adjustment is best not more than 0.15mm.
③ use a lower punching speed.
④ sheet to be flat without distortion or tilt.
⑤ forming processing should be placed as far away from the clamp clamp.
⑥ Forming mold should be used to avoid down forming operation:
⑦ stamping in accordance with the first common stamping die, the final use of forming die.
(5) mold spring fatigue damage
Punch die easy to overlook a problem in the use of aluminum alloy doors and windows on the life of the full mold springs, mold springs also need regular maintenance or replacement, but many users of equipment and molds can be maintained, but often overlooked mold spring Maintenance, and even some users have not replaced the spring for many years, with the station or die often damaged or stamping with material, but can not find the reason, then replace the mold spring, the problem is completely resolved. For different punch equipment and mold, the mold spring type is also different. If not properly maintained, prone to die with material and may damage the mold or guide sleeve, resulting in unnecessary losses.
