Thermal processing quality of mould to mold perfor

Release Date:2018-10-12 16:48:54

The hot working quality of the mould has great influence on the mold's performance and service life. In the actual work of our mold workshop for the design and production of a variety of molds are required to improve, and the specific operation will also be a problem, which we follow the mold manufacturers in Shenzhen to discuss and exchange the use of stamping mold problems




The quenching deformation and cracking of the working parts of the die and the early fracture in the use process are all related to the hot working process of the die.




(1) forging process, which is an important part in the manufacturing process of die parts. For the die of high alloy tool steel, the technical requirements are usually put forward for the microstructure such as carbide distribution. In addition, the forging temperature range should be strictly controlled, the correct heating standard should be formulated, the correct forging force method should be adopted, and the slow cooling or timely annealing after forging should be adopted.




(2) prepare for heat treatment. Preparatory heat treatment processes, such as annealing, normalizing or quenching and tempering, should be adopted to improve the microstructure, eliminate the structural defects of forged blanks and improve the workability, depending on the materials and requirements of the working parts of the die. High carbon alloy die steel can eliminate network secondary cementite or chain carbide after proper preparation heat treatment, make carbide spheroidizing and refining, and promote carbide distribution uniformity. This is conducive to ensuring quenching and tempering quality and improving die life.




(3) quenching and tempering. This is the key link in die heat treatment. If overheating occurs during quenching and heating, the workpiece will not only cause greater brittleness, but also easily cause deformation and cracking during cooling, seriously affecting the life of the die. Special attention should be paid to the prevention of oxidation and decarbonization during the quenching and heating of the die. The heat treatment process specifications should be strictly controlled. Vacuum heat treatment can be adopted when conditions permit. After quenching, it should be tempered in time, and different tempering processes should be adopted according to the technical requirements.




(4) stress relief annealing. The working parts of the die should be annealed after rough machining to eliminate the internal stress caused by rough machining, so as to avoid excessive deformation and cracks caused by quenching. For the die with high precision, stress relief tempering is needed after grinding or electrical machining, which is beneficial to stabilizing the precision of the die and prolonging its service life.

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