The control of the raw materials of the mold is carried out in the following aspects:
1. Macro inspection
The chemical composition is decisive for ensuring the performance of the steel, but the composition is qualified, and the steel properties cannot be fully explained. Due to the uneven organization and composition of the steel, the macroscopic inspection largely complements this deficiency.
Macroscopic inspection can observe the crystallization of steel, the destruction of steel continuity and the inhomogeneity of certain components.
Standard "Low-Structure Defect Rating Chart for Structural Steel" GB1979
There are 8 common defects in macroscopic: segregation, looseness, inclusions, shrinkage cavities, bubbles, white spots, cracks, and folds.
2.1. Evaluation of annealed tissue
The purpose of annealing is to reduce the hardness of the steel, to facilitate machining, and to prepare the tissue for subsequent heat treatment.
The annealed structure of carbon tool steel is evaluated according to the GB1298 first-level rating chart.
2.2, carbide non-uniformity
Cr12 type Leysite steel contains a large amount of eutectic carbides in the structure. Carbide inhomogeneity has a very important influence on the performance of use, so the distribution of carbides must be strictly controlled.
All in all, because the production objects of the mold production plant and the workshop are relatively cumbersome, and the number is one-piece and small-quantity, which brings certain difficulties to the formulation and management of the mold production quota, plus the production methods of the factories and workshops. The equipment and technical quality are not the same. Therefore, when formulating the quota, it is necessary to find out the appropriate method according to the actual situation of the factory and the workshop to develop an advanced and reasonable working hour quota to improve the labor.
1. Macro inspection
The chemical composition is decisive for ensuring the performance of the steel, but the composition is qualified, and the steel properties cannot be fully explained. Due to the uneven organization and composition of the steel, the macroscopic inspection largely complements this deficiency.
Macroscopic inspection can observe the crystallization of steel, the destruction of steel continuity and the inhomogeneity of certain components.
Standard "Low-Structure Defect Rating Chart for Structural Steel" GB1979
There are 8 common defects in macroscopic: segregation, looseness, inclusions, shrinkage cavities, bubbles, white spots, cracks, and folds.
2.1. Evaluation of annealed tissue
The purpose of annealing is to reduce the hardness of the steel, to facilitate machining, and to prepare the tissue for subsequent heat treatment.
The annealed structure of carbon tool steel is evaluated according to the GB1298 first-level rating chart.
2.2, carbide non-uniformity
Cr12 type Leysite steel contains a large amount of eutectic carbides in the structure. Carbide inhomogeneity has a very important influence on the performance of use, so the distribution of carbides must be strictly controlled.
All in all, because the production objects of the mold production plant and the workshop are relatively cumbersome, and the number is one-piece and small-quantity, which brings certain difficulties to the formulation and management of the mold production quota, plus the production methods of the factories and workshops. The equipment and technical quality are not the same. Therefore, when formulating the quota, it is necessary to find out the appropriate method according to the actual situation of the factory and the workshop to develop an advanced and reasonable working hour quota to improve the labor.
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