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Hot Processing of Crate Mould from xiu's blog

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The quality of the hot work of the Crate Mould(FURNITUREMOULD) has a significant impact on the performance and service life of the mould. In the actual life work, our mould shop requires the improvement of the design and production of various moulds, and there will be problems in the specific operation.

The quenching deformation and cracking of the working parts of the crate mould, and the early fracture of the use process are all related to the hot working process of the tool.

(1) Forging process, which is an important part of the manufacturing process of crate mould parts. For moulds of high alloy tool steels, technical requirements are often imposed on metallographic structures such as material carbide distribution. 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 post-forging slow cooling or timely annealing should be carried out.

(2) Preparatory heat treatment. Pre-heat treatment processes such as annealing, normalizing or quenching and tempering should be used according to the materials and requirements of the crate mould working parts to improve the structure, eliminate the structural defects of the forged blank, and improve the processing technology. The high-carbon alloy dies steel can eliminate the reticulated secondary cementite or chain carbide after appropriate preliminary heat treatment, so that the carbide is spheroidized and refined, and the uniformity of carbide distribution is promoted. This is beneficial to ensure the quality of quenching and tempering and improve the life of the mould.

(3) Quenching and tempering. This is a key link in the heat treatment of crate mould. If the superheat occurs during quenching, not only will the workpiece cause greater brittleness, but also cause deformation and cracking during cooling, which seriously affects the life of the mould. Special care should be taken to prevent oxidation and decarburization during die quenching. The heat treatment process specification should be strictly controlled. Vacuum heat treatment can be used if conditions permit. 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 crate mould should be subjected to stress relief annealing after roughing, with the purpose of eliminating the internal stress caused by rough, so as to avoid excessive deformation and cracking caused by quenching. For moulds with high precision requirements, it needs to be subjected to stress-relieving and tempering after grinding or electric machining, which is beneficial to stabilize mould precision and improve service life.

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