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The thermal processing quality of the injection mold affects the performance of the injection mold

Posted by: Koer    Time:3/19/2022 11:59:00 AM

The thermal processing quality of the injection mold has a great influence on the performance and service life of the injection mold. In actual life and work, our injection mold workshop requires excellence in the design and production of various injection molds, and there will be problems in specific operations. The manufacturer will explain to you some details that need to be paid attention to in the use of stamping injection molds. The work of injection molds The quenching deformation and cracking of the parts, and the early fracture during the use process are all related to the hot working process of the mold.

(1) Forging process, which is an important link in the manufacturing process of injection mold working parts. For the injection mold of high alloy tool steel, technical requirements are usually put forward for the metallographic structure such as the carbide distribution of the material. In addition, the forging temperature range should be strictly controlled, the correct heating specification should be formulated, the correct forging force method should be adopted, and the forging should be cooled slowly or annealed in time.

(2) Preparatory heat treatment. Depending on the materials and requirements of the working parts of the injection mold, preliminary heat treatment processes such as annealing, normalizing or quenching and tempering should be used to improve the structure, eliminate the organizational defects of the forging blank, and improve the processing technology. The high carbon alloy injection mold steel can eliminate the reticulated secondary cementite or chain carbide after appropriate preparatory heat treatment, make the carbide spheroidized and refined, and promote the uniformity of carbide distribution. This is conducive to ensuring the quality of quenching and tempering, and improving the life of the injection mold.

(3) Quenching and tempering. This is a key link in the heat treatment of injection molds. If overheating occurs during quenching and heating, it will not only cause greater brittleness of the workpiece, but also easily cause deformation and cracking during cooling, which will seriously affect the life of the injection mold. When the die is quenched and heated, special attention should be paid to preventing oxidation and decarburization, and the heat treatment process specification should be strictly controlled. When conditions permit, vacuum heat treatment can be used. After quenching, it should be tempered in time, and different tempering processes should be adopted according to technical requirements.

(4) Stress relief annealing. The working parts of the injection mold should be subjected to stress relief annealing treatment after rough machining. The purpose is to eliminate the internal stress caused by the rough machining, so as to avoid excessive deformation and cracks caused by quenching. For injection molds with high precision requirements, they need to undergo stress relief tempering after grinding or electrical machining, which is conducive to stabilizing the injection mold accuracy and improving service life.

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