1. The mold material is not easy to be broken in subsequent processing.
Die life of different materials often varies. To this end, two basic requirements are imposed on the material of the die working parts:
A.The material should have high hardness (58~64HRC) and high strength, high wear resistance and sufficient toughness, small heat treatment deformation and certain thermal hardness;
B.Process performance is good. Die manufacturing parts manufacturing process is generally more complex. Therefore, it must have adaptability to various processing techniques, such as forgeability, machinability, hardenability, hardenability, quench crack sensitivity and grinding processability. Generally, according to the material characteristics, production batch, precision requirements, etc. of the stamping parts, the high-performance mold materials are selected, and the craftability and economy are taken into consideration.
2. Heat treatment: improper quenching and tempering process produces deformation
Practice has proved that the hot processing quality of the mold has a great influence on the performance and service life of the mold. From the analysis and statistics of the causes of mold failure, it is known that the mold failure “accident” caused by improper heat treatment accounts for more than 40%. The quenching deformation and cracking of the working parts of the mold, and the early fracture of the working process are all related to the hot working process of the tool.
A.Forging process: This is an important part of the manufacturing process of mold parts. For molds 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, etc.
B.Pre-heat treatment: Pre-heat treatment processes such as annealing, normalizing or quenching and tempering should be used depending on the materials and requirements of the working parts of the mold to improve the structure, eliminate the structural defects of the forged blank, and improve the processing technology. The high-carbon alloy mold steel can eliminate the reticulated secondary cementite or chain carbide after proper 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 mold.
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