Stamping die is a special process equipment that processes materials into parts (or semi-finished products) in cold stamping processing, called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses a die mounted on a press to apply pressure to the material at room temperature to produce separation or plastic deformation, so as to obtain the required parts.

Stamping is one of the practical processes of mass parts forming production. In the stamping production process, the mold has the most problems, and it is the most important factor in the entire stamping production factors. It directly affects production efficiency and cost. Affect the product delivery cycle. Mold problems are mainly concentrated in mold damage, product quality defects and mold grinding, which have long plagued the industry production. Only get these key points right. Stamping production can proceed smoothly.

Mold failure is the most common problem in stamping production, which often causes production suspension and affects the production cycle of products. Therefore, it is necessary to find the cause of mold failure as soon as possible and maintain it reasonably.

1, mold damage Mold damage refers to the mold cracking, breaking, expanding, etc. To deal with the problem of mold damage, we must find the cause from the design of the mold, manufacturing process and mold use. First of all, it is necessary to review whether the manufacturing material of the mold is suitable and whether the corresponding hot burial process is reasonable. Usually, the heat treatment process of the mold material has a great influence on it. If the quenching temperature of the mold is too high, the quenching method and time are unreasonable, and the tempering frequency and temperature are improperly selected between the elbows, it will lead to damage after the mold enters the stamping production. The size or depth of the blanking hole is not enough, which is easy to block the slot and cause damage to the blanking plate. Spring force design is too small or equal height sets are not high, will make the spring break, blanking plate tilt. Cause overlap punch, damage parts.

Improper fixing of the punch or insufficient screw strength. This can cause the punch to fall or break.

When the mold is used, the position and direction of the parts are installed incorrectly or the bolts are not fastened well. The working height adjustment is too low, the guide column lubrication is insufficient. Failure of feeding equipment, abnormal press, etc., will cause damage to the mold. If foreign matter enters the mold, parts overlap, waste blocking and other situations are not treated in time, and the processing and production continue, it is easy to damage the blanking plate, punch, lower template and guide post of the mold.

2, in the stamping process, once the mold is not flexible, or even stuck, it is necessary to immediately stop production, find out the cause of the mold, and eliminate the fault. Otherwise, it will expand the fault, resulting in mold damage.

The main causes of clamping are: poor mold orientation, tilt. Or there is a foreign body between the template, so that the template can not be flat; Mold strength design is not enough or uneven force. Cause mold deformation, such as mold base, template hardness, thickness design is too small, easy to be affected by external force deformation; The mold position is not installed, and the positioning error of the upper and lower molds is out of tolerance. Or the accuracy of the press is too poor, so that the mold interferes; The strength of the punch is not enough, and the position of the size punch is too close, so that the lateral force of the die is unbalanced. At this time, the strength of the punch should be increased and the guiding protection of the discharge plate should be enhanced.

3, mold damage and maintenance of stamping production of mold costs are high. Usually the mold cost accounts for 1/5-1/4 of the total cost of the parts. This is because, in addition to mold manufacturing is difficult and high cost. After putting into production, the cost of mold repair and grinding maintenance is also high, and the original cost of the mold only accounts for about 40% of the entire mold cost. Therefore, timely maintenance of the mold and prevention of mold damage can greatly reduce the cost of stamping production.

In general, after the mold is damaged, there is also a choice of maintenance and scrapping. Unnatural wear failure of the stamping die, such as the destruction of non-critical parts. And the small punch break, punch upsetting short, concave plate cracking, punching edge crack and other failures. Most of them can be completely restored to their normal state by means of maintenance and re-put into stamping production. But. When the key parts of the mold are seriously damaged, sometimes the convex and concave dies are damaged at the same time. The one-time repair cost exceeds 70% of the original cost of the die, or the life of the die is near. The significance of maintenance is not much, at this time should consider scrap molds: in addition to large molds, continuous molds with complex structures. When the mold maintenance technology is too complex, the repair cost is too large, and the difficulty is bound to make the maintenance cycle too long, which seriously affects the normal production of stamping, it should be selected to fail and scrap in advance and re-manufacture the mold.

The production efficiency and cost of stamping depend greatly on the mold. The mold failure in the production process should be analyzed in detail and the correct maintenance plan should be formulated. Timely solve mold damage, clamping, grinding and product quality defects and other problems. Deal with the relationship between mold maintenance and scrap, in order to reduce the production time, shorten the production cycle, and ensure the normal progress of stamping production.