In order to realize the exquisite workmanship of the mold manufacturing process, we will heat the mold, not only to improve the precision of the mold, but also to improve the use of the quality of the workpiece and the precise height, the following is shared for everyone on the mold heating four important Link, hope to use the help of the development of the workpiece.
1, forging process. This is an important part of the manufacturing process of mold working parts. For the tooling of high-alloy tool steels, the technical requirements for the metallographic structure of the material, such as the distribution of carbides, are usually put forward. In addition, the forging temperature range should be strictly controlled, the correct heating specification should be established, the correct forging force method should be used, and the slow cooling or timely annealing after forging should be adopted.
2, preparatory heat treatment. The heat treatment process of annealing, normalizing or tempering should be adopted separately depending on the materials and requirements of the working parts of the mold, in order to improve the organization, eliminate the defects of the forging blanks, and improve the processing technology. The high-carbon alloy die steel can eliminate meshed secondary cementite or chain carbides after proper pre-heat treatment, so that the carbides are spheroidized and refined, and the distribution of carbides is promoted. This will help ensure the quality of quenching and tempering and improve the life of the mold.
3, quenching and tempering. This is a key part of the mold heat treatment. If overheating occurs during quenching and heating, not only the workpiece will cause large brittleness, but also it will easily cause deformation and cracking during cooling, which will seriously affect the life of the mold. Special care should be taken to prevent oxidation and decarburization during die quenching and heating. Strictly control the heat treatment process specification. When conditions permit, vacuum heat treatment can be used. After quenching, it shall be tempered in time, and different tempering processes shall be adopted according to technical requirements.
4, stress relief annealing. After the parts are machined, the stress relief annealing treatment should be performed. The aim is to eliminate the internal stress caused by the rough machining, so as to avoid quenching and excessive deformation and cracks. For molds with high precision requirements, after stressing or electro-machining, they need to undergo stress-reducing and tempering treatment, which will help stabilize the accuracy of the mold and increase the service life.
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