In order to reduce the maintenance cost and improve the maintenance efficiency, when designing the dry powder pressing mold, the base part and the forming part of the punch do not adopt the traditional welding process, but the positioning loading and unloading fixing structure is adopted.
On the premise of ensuring the required hardness, the hardness of the punch should be slightly less than the hardness of the female model cavity and requires sufficient strength, on the premise of ensuring the required hardness. The mold material is YG11C, and the punch material is YG25C.
Generally speaking, in the range of repeated positioning accuracy of the press, the smaller the clearance between the punch and the female mold is, which is beneficial to improve the pressing quality. Therefore, for the porous dry powder pressing mold, the cooperation between the punch and the female mold is not only a single The basic size gap also requires a symmetrical gap, ie the symmetry of the die hole and the punch gap.
For the dry powder pressing mold, under the premise of ensuring the hardness of the cavity, the higher the cavity finish, the better the forming quality. Even in the processing of the mold, even if the front processing cannot guarantee a good finish, it can be achieved by the fitter polishing. Finish requirements. However, it has a great influence on the precision of the mold. Generally, the smoothness of the wire cutting and the rough machining of the precision spark machine can generally reach Ra0.8~2.5um, and the cavity finish of the finishing process can generally reach Ra0.2~0.4um.http://www.yxhgmould.com/