Analysis of the Causes of the Burst of the Metal Stamping Die

Analysis of the causes of metal stamping die bursting: 1. The blanking is not smooth. There is no demagnetization treatment before production, and no return pin; there are broken needles and springs and other jams in the production; there is no leakage, or rolling, blocking, and stepping when assembling the mold. This is the most common point. If the assembling master does not pay attention, such as when there are many blanking holes, or when the mold has cushions, this situation is most likely to occur. 2. Design process The strength of the mold is not enough, the knife edge distance is too close, the mold structure is unreasonable, and the number of template blocks is not enough and there is no backing board. 3. Heat treatment: deformation caused by improper quenching and tempering process. Practice has proved that the quality of die thermal processing has a great impact on the performance and service life of the die. From the analysis and statistics of the causes of mold failure, it can be seen that 'accidents' of mold failure caused by improper heat treatment account for more than 40%. 5. Improper wire cutting treatment Pull the wire cutting properly, the wire cutting gap is not handled properly, and there is no effect on the metamorphic layer of the clear angle and the wire cutting. The cutting edge of the die is mostly processed by wire cutting. Due to the thermal effect and electrolysis of the wire cutting process, a certain thickness of metamorphic layer is produced on the surface of the mold, which causes the surface hardness to decrease, and the appearance of microcracks, etc., makes the wire cutting die prone to early wear, which directly affects the die blanking gap. Keeping and cutting edges are easy to chip and shorten the service life of the mold. Therefore, in the on-line cutting process, reasonable electrical standards should be selected to minimize the depth of the metamorphic layer. 6. Selection of Punch Equipment The punch tonnage, the punching force is not enough, and the mold adjustment is too deep. The accuracy and rigidity of stamping equipment (such as presses) have an extremely important impact on the life of the die. The stamping equipment has high precision and good rigidity, and the life of the die is greatly improved. For example, the material of the complex silicon steel sheet die is Crl2MoV, which can be used on an ordinary open press with an average regrinding life of 10,000 to 30,000; while on a new precision press, the die can have a regrinding life of 60,000 to 120,000.