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Product burr increases

When the mold production for a period of time, there will be increased burr parts production, then you should check the convex die edge, if you find the edge of the wear or chipping, should be sharpened, after sharpening the punch or concave Die pad on the appropriate thickness of the gasket. After the die has been sharpened many times, it should be checked whether the straight wall of the cutting edge has been worn away. If there is no knife-edge straight wall, you have to replace the die insert if convex, die edge no wear, and parts on the uneven burr, blanking gap due to the offset, this time to adjust the gap.

Scrap floating

In stamping production, the floating of waste is a big problem, it not only affect the production, and even damage the mold. In general, round or square regular shaped waste is prone to floating, while more complex shaped waste is less likely to float.

The following describes some of the causes of waste up and solutions.

(1) blanking gap, if in the trial stage often appear on the float, then blanking gap is too large. The die should be re-made and the blanking gap reduced. If only occasional scraps float up, you can use spark discharge in the cavity to increase the roughness.

(2) the surface of the punch is too smooth, the waste material is attached to the punch under atmospheric pressure, and the stoma can be increased on the punch.

(3) one-sided blanking waste generated floating, not punching side increase sharp corner squeeze waste.

(4) high stamping speed, should consider reducing the speed, such as due to production needs can not slow down, you can increase in the punch ram, top waste.

In addition, there are some human factors such as the incomplete demagnetization after blade donation, the excessive use of punching oil during the compression of God, and so on, all of which should be avoided.

Stacking phenomenon

In stamping production. After the last station is cut off, the production parts are blown out of the mold in time and remain in the mold, which can easily result in the phenomenon of stackup. Stacking is very dangerous, it is easy to damage the mold. There are many factors that produce stacks, such as insufflated air blowing, stamped oil sticking, and production pieces hooked on the ram. In view of these factors, a variety of measures can be taken to prevent the occurrence of stacker phenomenon. For example, in the production of stamping to ensure that the wind blowing enough to die when the die design in the die plate and the discharge plate are added ram, die plate which should be larger design of the ram, at least than the hole on the part Large, or simply take the film block structure, in order to avoid the production of parts hooked on the mandrel. Design concave template, in ensuring the punching strength of the premise should be at the end of the concave template design a wide slope, so that the production of parts can be successfully slipped out of the mold. In addition, should also be considered in the design of the last station as much as possible to be cut off the production of cattle protruding parts of the concave template or extending at least one-half of the ramp, try to rely on the weight of the production parts slide out of the mold.

Leakage hole blocked

In the stamping production, if there is blockage of the flood hole material has not been found in time, it is easy to damage the mold, resulting in punch break or die burst. To prevent the leakage hole plugged to ensure leakage of material smoothly. Be sure to squeeze the size of the leak hole. For some prominent small parts, the size of the leak hole should be properly enlarged; and for the waste material caused by the tumble of the plug hole, to reduce the size of the leak hole. When the mold design. Should be given enough attention to the leakage hole, the design of the die plate to die plate as a reference to ensure that the die plate leakage profile than the concave template leakage material outline, the design of the die frame to die plate is Reference. And so on. Finally, to ensure that the mounting plate leakage hole than the machine leakage hole is small, otherwise, we must open the slope in the lower mounting plate to ensure that the final slipper skidding machine leakage hole.

In addition, the die edge grinding mill or stamping oil too much posts will lead to leakage hole plugging, to promptly sharpening or reduce the replacement of stamping oil.

Poor feeding

Poor delivery of feed affects production, while damage to the mold. Produced for the following reasons:

(1) There is a difference between the step-by-step distance and the designed step in production, and the step-by-step distance should be adjusted.

(2) Pill spacing is too large, should increase the number of nail lift.

(3) Lifting height of material is not enough, the material is easy to hook hanging on the lifting block or mandrel, should increase the material lifting height.

(4) feed pin nail into the gap is too small, the feed is not smooth feed, should be appropriate to enlarge the gap.

(5) The material is too thin and too thin, prone to tilt, the material should be lifted in the middle of blocks.