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Mold making inspection

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2022-05-10 16:06

The control of the raw materials of the mold is carried out from the following aspects:

1. The chemical composition of macroscopic inspection is decisive to ensure the performance of steel, but the composition is qualified and cannot fully explain the performance of steel. Due to the inhomogeneity of internal structure and composition of steel, macroscopic inspection largely supplements this deficiency. .

Macroscopic inspection can observe the crystallization of the steel, the failure of the continuity of the steel and the inhomogeneity of some components.

Standard "Low-magnification structure defect rating chart of structural steel" GB1979 macroscopic common 8 kinds of defects: segregation, porosity, inclusion, shrinkage, air bubbles, white spots, cracks, folding.

2.1. Evaluation of annealing structure The purpose of annealing is to reduce the hardness of steel, facilitate machining, and also prepare structure for subsequent heat treatment. The annealed structure of carbon tool steel is evaluated according to the first-level rating chart of GB1298.

2.2. Carbide inhomogeneity

Cr12 type ledeburite steel contains a large amount of eutectic carbides in the structure, and the inhomogeneity of carbides has a very important influence on the performance, so the distribution of its carbides must be strictly controlled.

All in all, due to the cumbersome production objects of mold factories and workshops, and more or less single pieces and small batches, it brings certain difficulties to the formulation and management of mold production quotas. The equipment and technical quality are not the same, so when setting the quota, it is necessary to find an appropriate method to formulate an advanced and reasonable working hour quota according to the actual situation of the factory and the workshop, so as to improve the labor productivity.

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