Time：2019-07-11| Author：Admin
Stamping die is a special process equipment for processing materials into parts (or semi-finished products) in cold stamping processing, called cold stamping die (commonly known as cold die). Stamping is a pressure processing method in which a material is applied to a material by means of a mold mounted on a press at a room temperature to cause separation or plastic deformation to obtain a desired part.
Stamping is one of the practical processes for the production of large quantities of parts. In the stamping production process, the mold has the most problems, and it is the most important factor in the entire stamping production factor. Directly affect production efficiency and cost. Affect the delivery cycle of the product. Mold problems are mainly concentrated in mold damage, product quality defects and mold sharpening, which have long plagued industry production. Only these key points are handled correctly. Stamping production can be carried out smoothly.
Mold failure is the most prone problem in stamping production, often resulting in production downtime, affecting product production cycle. Therefore, the cause of the mold failure must be found as soon as possible, and reasonable maintenance.
Mold damage Mold damage refers to cracking, breaking, and opening of the mold. To deal with the problem of mold damage, it is necessary to find the reason from the design of the mold, the manufacturing process and the use of the mold. First of all, it is necessary to check whether the manufacturing materials of the mold are suitable, and whether the corresponding hot-buried process is reasonable. Generally, 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 number of tempering and temperature, and improper selection between the elbows, the mold will be damaged after entering the stamping production. The size or depth of the blanking hole is not designed enough to easily block the slot and cause the blanking plate to be damaged. If the spring force design is too small or the height is not equal, the spring will break and the blanking plate will tilt. This will cause overlapping punching and damage to the parts.Improper punching or insufficient screw strength can cause the punch to fall or break.When the mold is used, the position and orientation of the parts are incorrectly installed or the bolts are not fastened. The working height is adjusted too low and the guide column is insufficiently lubricated. If the feeding equipment is faulty, the press is abnormal, etc., the mold will be damaged. If the foreign matter enters the mold, the overlap of the parts, the blockage of the waste, etc. are not treated in time, and the processing is continued, the blanking plate, the punch, the lower template and the guide post of the mold are easily damaged.
2, card mold In the stamping process, once the mold clamping is not flexible, or even stuck, you must immediately stop production, find out the reasons for the card model, troubleshooting. Otherwise, the fault will be enlarged and the mold will be damaged.
The main causes of the card mold are: poor mold orientation and tilt. Or there is a foreign object between the templates, so that the template can not be flat; the mold strength design is not enough or the force is uneven. The deformation of the mold is caused. For example, the hardness and thickness of the mold base and the template are too small, and it is easily deformed by external force; the position of the mold is not installed correctly, and the positioning error of the upper and lower molds is excessive. Or the accuracy of the press is too poor, causing the mold to interfere; the strength of the punch is not enough, the size of the punch is too close, and the lateral force of the mold is unbalanced. At this time, the punch strength should be increased to enhance the guiding protection of the discharge plate.
3. Mold damage and maintenance The cost of stamping production is high. Usually the mold cost accounts for 1/5-1/4 of the total cost of the part. This is because, in addition to the difficulty in manufacturing the mold and the high cost. The cost of mold repair and sharpening maintenance after putting into production is also high, and the original cost of the mold only accounts for about 40% of the total mold cost. Therefore, timely repair of the mold to prevent mold damage can greatly reduce the cost of stamping production.
In general, after the mold is damaged, there is a question of maintenance and scrapping. Unnatural wear of stamping dies, such as damage to non-critical parts. And the small punch is broken, the punch is shortened, the concave template is cracked, the punching edge is cracked, etc. Most of them can be completely restored to the normal state by the maintenance method, and put back into the stamping production. but. When the key parts of the mold are seriously damaged, sometimes the convex and concave molds are damaged at the same time. The one-time repair cost exceeds 70% of the original cost of the die, or the mold life is near. The meaning of maintenance is not great. At this time, the scrap mold should be considered: except for the large mold and the continuous mold with complicated structure. When the mold repair technology is too complicated and the cost of mold repair is too large, the difficulty will inevitably make the maintenance period too long, which will seriously affect the normal production of stamping. It is necessary to choose to scrap the scrap beforehand and remanufacture the mold.
Stamping production efficiency and cost are highly dependent on the mold. For the failure of the mold in the production process, specific problems should be analyzed and the correct maintenance plan should be formulated. Timely resolution of mold damage, jamming, sharpening and product quality defects. To deal with the relationship between mold repair and scrapping, it is possible to reduce the time for mold-off repair, shorten the production cycle, and ensure the normal production of stamping.
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