The control of the raw material of the mould is carried out from the following aspects:
1. Macroscopic test
Chemical composition to ensure that the performance of steel is decisive, but the composition of qualified, can not fully explain the performance of steel, due to the internal structure and composition of steel heterogeneity, macro-testing to a large extent to supplement this aspect of the deficiencies.
Macroscopic test can observe the crystallization of steel, the failure of continuous steel and the inhomogeneity of some components.
2. Evaluation of annealing tissue
The purpose of annealing is to reduce the hardness of steel, facilitate machining, and also prepare for subsequent heat treatment.
Carbon tool steel annealing organization according to the GB1298 first grade rating map evaluation.
3. Carbide heterogeneity
Cr12 type of Laigang, the microstructure contains a large number of eutectic carbide, carbide heterogeneity has a very important effect on the performance, so the distribution of its carbide must have strict control.
In short, because the mold production plant and workshop production object is more cumbersome, and how much is a single piece, small batch, so as to mold production quota formulation and management to bring certain difficulty, plus the factory and workshop production mode, equipment, technical quality is not the same, so in the formulation of quotas, According to the actual situation of our factory and workshop, we should find out the suitable method to make the time quota which is both advanced and reasonable to improve the labor productivity.