The control of mold raw materials should be carried out from the following aspects:
1. Macroscopical examination of chemical composition to ensure the performance of steel is decisive, but the qualified composition cannot fully explain the performance of steel, because of the inhomogeneity of internal structure and composition of steel, macroscopical examination to a large extent complements the defects in this respect. The macroscopical test can observe the crystallization of steel, the continuous failure of steel and the inhomogeneity of some components. Standard "assessment drawing of structural steel low power structure defects" gb1979
There are 8 kinds of defects in macrostructure: segregation, looseness, inclusion, shrinkage, bubble, white spot, crack and fold. Die
The purpose of annealing is to reduce the hardness of steel, to facilitate processing and to prepare for the subsequent heat treatment. The annealing structure of carbon steel tool steel was evaluated according to the first grade evaluation chart of gb1298.
There are a lot of eutectic carbides in the structure of Cr 12 type leistentitic steel. The non-uniformity of carbides has a very important influence on the service performance. Therefore, the distribution of carbides must be strictly controlled. To sum up, due to the tedious production objects of mold factories and workshops, the number of single piece and small batch, the difficulty in the formulation and management of mold production quota, and the difference between GeChang and workshop production methods, equipment, technology and quality, we must find out appropriate methods to develop advanced and reasonable task time according to the actual situation of our factories and workshops, To improve labor productivity.
The above is a detailed introduction of Jinan mold manufacturing and testing. For more information, please click http://www.jnhjgs.cn