The early plastic Medical treatment drip chamber failure or cracking failure of the cavity has a great relationship with the material’s high temperature yield strength or insufficient plasticity. It is convenient for reference and application. the sample size on a high-temperature tensile testing machine: M12mmXmmX70mm The test temperature is 84, determine the forging heating temperature tempering stability (tempering temperature and Hardness relationship) Tempering stability is the basic performance of hot work molds. Therefore, it can be used as a supplementary basis for studying the forging performance of hot work die steel in homemade Thomas Test the ring-shaped sample ruler on the testing machine.
The size of the hot work die steel cutting force Pz (N) can be used to push the following empirical formulas. Therefore, the thermal stability, thermal fatigue resistance, thermal wear resistance and melting loss resistance of the mold material directly affect the hot work mold. Sample size: 10mm Oxidation performance The oxidation of the surface of the mold cavity during hot working will accelerate the thermal wear of the cavity and exacerbate the initiation of thermal fatigue cracks, which will affect the service life of the mold. Experience formula for material selection of small and medium-sized machine forging dies The user selects the material properties corresponding to the temperature according to the main failure mode of the enterprise’s mold and the high temperature of the mold cavity surface, and substitutes it into formula 3.
Type impact testing machine. Compared with the previous manuals of various materials, all the data are self-tested except for the individual data that are collected. The sample size is the same as above. The fracture toughness at room temperature does not correctly reflect the probability of failure of the hot work die due to the impact toughness value, and it is not combined with the stress calculation during design.
The failure accounted for about 1C. 3 The aluminum, copper die casting mold and small and medium machine forging die material selection experience formula in a large number of measured hot Based on the material properties of the die steel, the failure analysis of the die, the statistics of the failure types, and the comparative test of the service life of the same kind of die steel, the following formulas are proposed for the factory and enterprise to select materials for the aluminum and copper die casting molds when selecting the die steel.
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