NEWS
(1) the main reason is that the punch is worn too fast:
The clearance of the mold is too small, and the overall clearance of the mold is 20%, 25% of the thickness of the material.
The neutral of the concave convex die is not good, including the die holder and the die guide component and the lack of the precision of the turret bushing, which cause the mould to be bad for the towel.
The punch temperature is too high, mainly due to the same mold for long time stamping, resulting in overheating punch.
The grinding method of the die is not proper, which causes the mould to be annealed and the wear is aggravated.
The local side punching, such as punching, punching or shearing step angle, Aluminum Alloy doors and windows accessories lateral force will make the punch to the side edge of the gap decreases, causing serious wear, if the machine tool installation accuracy is not high, serious will make a partial punch die, causing the punch and die damage.
(2) die material problem;
The mold material will cause waste rebound, and its related factors:
The sharpness of the edge of the die, the greater the fillet of the blade, the more likely to cause waste rebound.
Second, the modulus of the mold, each of the upper machine tool into the modulus is certain, mold modulus is small, easy to cause waste rebound. Die holder WeChat: mujudaren
The clearance of the mould is reasonable, if the gap of the mold is not suitable, it will easily cause waste rebound.
Be processed sheet material, and whether there is more oil?.
Fatigue damage of spring.
Method for preventing mold material from being fed:
Use special tape proof die. Aluminum alloy door and window fittings
Mould often sharpening, keep sharp, and demagnetization processing.
Increase the clearance of the die.
Adopt oblique edge n mold instead of flat blade die.
Die installation and return machine.
The increase in modulus of reasonable mould.
Check the mold unloading spring or set of material fatigue strength.
(3) the neutral problem of dies;
When the mold is in use, it is easy to happen the abrasion of each side of the punching core, and some parts have bigger scratches and wear faster. This situation is particularly evident on the narrow rectangular mold. The main reason for the problem:
The machine tool turret design or machining precision. Mainly on the turntable seat Yun mold installation is not good for neutral. Mold design or precision can not meet the requirements.
The precision of the guide sleeve of the die is not enough.
The gap selection is not suitable.
Mould mounting block or die guide sleeve is not suitable for neutral wear due to long wear.
To prevent mold wear from being inconsistent:
Regular centering mandrel is used to adjust the neutral of machine tool turret and mounting seat.
Change the guide sleeve of the mould in time and choose the concave and convex die with suitable clearance.
Adopt full lead mold.
Fourth, to strengthen the sense of responsibility of the operators, and find out the reasons in time to avoid greater losses.
(4) use of special forming dies;
In order to meet the needs of production, often need to use special mold or mold, main bridge shaped mold, mold, blinds sink hole shape mould, tapping hole flanging mould, convex mold, tensile mold, combined die, or the use of special forming mould can all improve production efficiency, but the forming die the higher the price, usually is 4-5 times of ordinary mould. In order to avoid mistakes, the following principles should be observed and followed:
Check the direction of the mold installation, to ensure that the die punch die installation in the same direction.
According to the requirements of the correct adjustment of mold stamping depth, each adjustment is best not more than 0.15mm.
Use lower punching speed.
Sheet material should be smooth, free of deformation or tilting.
Shaping and bending should be done far away from the clamp.
The mold should be used to avoid the downward forming operation:
The stamping according to general die stamping, finally forming mould.
(5) die spring fatigue damage;
A problem easy to overlook the use of punch die, Aluminum Alloy doors and windows accessories is the mold service life of the spring, die spring also need regular maintenance or replacement, but many domestic users of the equipment and tooling for maintenance, but often ignored the spring maintenance, and even some users have replaced the spring for many years the same station, or often damaged or die stamping material, but can not find the reasons, then replace the mold after the spring, the problem to be solved. For different punch equipment and mold, the mold spring type is different. In case of improper maintenance, it is easy to produce mold material and may cause damage to the mold or guide sleeve, resulting in unnecessary losses.