The accuracy of the small punch directly affects the accuracy of the stamped parts and the life of the mold. The accuracy of a small press is actually divided into static accuracy when the press is not loaded and dynamic accuracy when it is loaded. The dynamic accuracy is very important in the actual stamping production of the punch. Due to the use of the punch, the actual load varies greatly. Therefore, it is technically difficult to formulate specifications. Therefore, it has not been integrated and formulated. The current situation is based on the static accuracy to represent the accuracy of the deep throat punch. In modern stamping operations, the stamping process cannot be achieved if there are only long-life molds without the combination of deep-throat punches and high-quality stamping materials.
The precision and rigidity of a small punch have a great influence on the life of the mold. The same mold shows different performance and service life on a small punch with different precision. If it is used tens of thousands of times on a general-precision punch, it will cause chipping, while on a small-sized punch with precision, it will only have chipping when it is more than 1 million times.
The precision of the guiding mechanism of the punch die. Correct and reliable guidance has a great impact on reducing the wear of the working parts of the punch die and avoiding the damage of the convex and concave dies, especially the gapless and small gap blanking dies, compound dies and multi-station progressive dies are more effective. In order to improve the life of the mold, it is necessary to accurately select the guiding form and determine the accuracy of the guiding mechanism according to the nature of the process and the accuracy of the parts. Under normal circumstances, the precision of the punch guide mechanism should be higher than the matching tip of the convex and concave dies. According to the stamping process of small presses and the types of raw materials, softening treatment and surface treatment can be arranged when necessary, and suitable lubricants and lubricating processes can be selected.
In actual production, due to the excessive thickness tolerance of the raw material of the external pressure parts, the fluctuation of the material function, the poor surface quality (such as rust) or unclean (such as oil stain), etc., it will cause the mold working parts to wear and chip easily. as a result of. For this reason, attention should be paid to the use of raw materials with good punching processability as much as possible to reduce the punching deformation force.