Stamping is one of the most useful processes for forming large quantities of parts. Die failure is a relatively simple problem in stamping production, which often causes production stoppage and affects the product production cycle. Therefore, it is necessary to find the cause of the mold failure as soon as possible and repair it reasonably.

1. Mold damage

Mold damage refers to mold cracking, breaking, opening, etc. To solve the problem of mold damage, it is necessary to find the reasons from the design of the mold, the manufacturing process and the use of the mold. If the conditions such as foreign matter entering the mold, stacking of parts, and waste obstruction are not dealt with in time, and the processing is continued, it is easy to damage the blanking plate, punch, lower template and guide post of the mold.

If the spring force is too small or the height of the sleeve is not equal, the spring will be cracked, the blanking plate will be skewed, and the stack will be punched and the parts will be damaged. If the quenching temperature of the mold is too high, the quenching method and time are not fair, as well as the number and temperature of tempering, and improper selection of elbows, the mold will be damaged after entering the stamping production. Improper fixing of the punch or insufficient strength of the screw will cause the punch to fall or break. The working height adjustment is too low, and the guide post is not smooth enough. Generally, the heat treatment process of the mold material has a great influence on it. If the size or depth of the blanking hole is not planned, it is easy to block the slot hole and cause damage to the blanking plate. When the mold is used, the position and direction of the parts are incorrectly installed or the bolts are not fastened properly.

 2. Card mold

The main reasons for the die are as follows: the die guide is incorrect and skewed. Otherwise, it will expand the fault, resulting in damage to the mold. Forming mold deformation, for example, the hardness and thickness of the mold base and the template are too small, and they are easily deformed by external force; the mold orientation device is not accurate, and the positioning error of the upper and lower molds is out of tolerance. At this time, the strength of the punch should be advanced to enhance the guidance and maintenance of the stripper.

Or the accuracy of the press is too poor, causing the mold to interfere; the strength of the punch is not good, and the size of the punch is too close, which makes the lateral force of the mold unbalanced. During the stamping process, once the mold clamping is insensitive or even stuck, it is necessary to stop production immediately to find out the cause of the stuck mold and eliminate the fault.

3. Repair

The cost of die produced by stamping is high. The general die cost accounts for 1/5-1/4 of the total cost of the part. The one-time correction cost exceeds 70% of the original cost of the die, or the die life is approaching. When the mold repair technology is too complicated, the mold repair cost is too high, and the difficulty is high, the repair cycle will be too long, which will seriously affect the normal production of stamping. Generally speaking.

After the mold is damaged, there is also a selection problem of repair and scrap. But. Therefore, repairing the mold in time to avoid damage to the mold can reduce the cost of the mold for stamping production. When the ties of the mold are severely damaged, sometimes the convex and concave molds are damaged together. This is because, in addition to the difficulty and high cost of mold making. Unnatural wear failure of stamping dies, such as damage to non-tie parts.

Under normal conditions, the main failure mode of stamping die is excessive wear. Re-mould production and delivery. Until the burr of the punched parts is overrun, the size and shape of the parts are accurate.

Suzhou Wellhong Electric Co., Ltd.is a professional manufacturer specialized in precision molds, injection molding, assembling and silk-printing. Chinese plastic mould plant Manufacturers and Plastic Mold Factory. Some moulds are exported to Japan, Europe and the United States. We have our own goods and factories so we can develop and produce the moulds according to the needs of our customers.