(1) Machinability.
The workability of steel mainly includes cutting, grinding, sunlight, cold technology and greater pressure processing. die tools steels are mostly hypereutectoid steels and austenitic steels, and their hot workability and cold workability are not very good. The process parameters of hot work and cold work must be controlled by the production grid. In recent years, in order to improve the cutting performance of trees, the steel can be used to change the distribution of debris in the center of the steel, thereby improving the surface quality of the mold and reducing the wear of the tool.
With the development of electronic technology, the wide application of CNC machine tools, machining centers and even computer control technology, mold steel must not only have good cutting performance, but also have good mirror polishing performance. Electrical processing performance and embossing restructuring performance.
(2) Hardware and hardenability.
The hardness barrier mainly depends on the hardness content of the steel. The permeability mainly depends on the chemical composition of the steel and the original structure of the steel before quenching. The different use conditions of the mold, the mold has a different focus on the requirements of these two properties. For molds that require uniform performance across the entire digital surface, such as hot work molds, plastic molds, etc., the hardenability of Cai Gao is more important: for small cold work molds that only require high hardness, such as blanking molds, pay more attention to high hardness.
(3) Fire temperature and heat treatment deformation.
In order to facilitate production, the quenching temperature range of die tools steel is required to be as wide as possible, especially when the die tools falls in the large flame heating station. The die tools steel is required to have a wider quenching temperature range. Except for some molds made of pre-hardened steel, most molds obtain the required structure and performance through heat treatment after reward processing. Therefore, it is required that the ruler changes little during quenching, the changes in all directions are similar, and the structure is stable.
(4) Sensitivity to decarburization.
When the cemented carbide die tools steel is manufactured, annealed or quenched, if it is heated in an unprotected atmosphere, the surface layer will have defects such as decarburization, thereby reducing the durability of the die tools. The decarburization sensitivity mainly depends on the chemical composition of the steel, especially the carbon content.
热门资讯
