How to control the quality of heat treatment of cold pier molds in actual production?
Release time:
2025/08/03
In actual production, the quality control of cold pier mold heat treatment needs to cover the entire process of raw material inspection, precise control of process parameters, dynamic monitoring of processes, equipment maintenance, and personnel operation specifications. Combined with the principle of "prevention first, process control, and result verification", it ensures that the mold performance (hardness, toughness, wear resistance) and dimensional accuracy meet stable standards. The specific measures are as follows:
1、 Raw materials: Quality control from the source
The heat treatment effect of cold pier molds is directly related to the composition, purity, and forging quality of raw materials, and must be strictly controlled before heat treatment:
Composition and organization inspection:
Require suppliers to provide material quality assurance certificates (including chemical composition and smelting process), with a focus on verifying the content of key elements such as carbon (C), chromium (Cr), molybdenum (Mo) (e.g. Cr12MoV needs to ensure C: 1.4-1.6%, Cr: 11-12%), in order to avoid insufficient hardness or cracking after heat treatment due to excessive composition;
Perform metallographic sampling on key molds (such as large concave molds) to confirm the absence of network carbides, band segregation, or shrinkage cavities (these defects can cause stress concentration and a sudden increase in the risk of cracking during quenching).
Forging quality verification:
Cold pier die steel (such as Cr12 series) needs to undergo forging to refine the grain size. If the forging is insufficient (such as insufficient upsetting), it will lead to loose structure and uneven performance after heat treatment. It is necessary to check the hardness (should be ≤ HB250) and streamline distribution after forging (streamline should follow the contour of the mold to avoid cross flow).
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