Heat treatment processing technology for metal part
A processing technology and powder technology, which is applied in the field of heat treatment of powder parts, can solve the problems of low success rate of processing powder parts, incomplete combination of steel grains, cracks in steel grains, etc., to achieve stable mechanical properties, eliminate internal stress, Effect of reducing crack rate
Pending Publication Date: 2021-07-06
鑫光热处理工业(昆山)有限公司
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Problems solved by technology
[0002] Powder parts are a kind of heat treatment of metal powder through high temperature and high pressure pressing, and then high frequency quenching and other treatment processes for hardness and toughness. Powder parts have the advantages of high strength, high hardness, high wear resistance, etc., and have gradually In fields such as the automobile industry, replacing traditional metal parts has become the development trend of metal parts in the future. However, for high-frequency heat treatment, the success rate of processing powder parts is quite low. The main reason is that powder parts are made of fine steel particles. Through compression molding, although its density is not smaller than that of ordinary castings, the steel particles are still not fully combined, which leads to thermal expansion during the high-frequency quenching process, causing the steel particles to separate and form cracks
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Embodiment Construction
[0018] Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0019] The present invention provides a technical solution: a heat treatment process for powder parts, comprising the following steps:
[0020] S1. Heating. In the high-frequency process at room temperature, the current is generated by the induction coil through the magnetic field to heat to 850-900°C within 1 second, and the powder is instantly heated to 900°C and kept for 1 second;
[0021] S2. Air cooling, the high-frequency machine stops heating, so that the powder parts stay in the air, and the powder parts are naturally cooled in the air for 1 second, so that the heating is completed before oxidation, and the range of the inside and outside drop of the powder parts is shortened. , to avoid cracks;
[0022] S3, tempering, the powder parts are taken out af...
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The invention relates to the technical field of metal heat treatment processes, and discloses a heat treatment processing technology for a metal part. The heat treatment processing technology comprises the following steps: heating: heating to 850-900 DEG C within one second through current generated by an induction coil through a magnetic field in a high-frequency process in a normal temperature state, instantly heating the powder part to 900 DEG C, and keeping for one second; and conducting air cooling: enabling a high-frequency machine to stop heating to make the powder part stay in the air, and naturally cooling the powder part for 1 second in the air. According to the heat treatment processing technology for the powder part, the instant temperature of the powder part is creatively increased to 900 DEG C and lasts for 1 second, and heating is finished before oxidation; and the heated powder part is placed in the air to be naturally cooled for 1 second, the surface temperature and the internal temperature of the powder part are balanced, the crack rate of the powder part is effectively reduced, the product percent of pass is increased, the structure of the powder part becomes finer and more uniform, and high hardness and high strength can still be obtained.
Description
technical field [0001] The invention relates to the technical field of metal heat treatment technology, in particular to a heat treatment process for powder parts. Background technique [0002] Powder parts are a kind of heat treatment of metal powder through high temperature and high pressure pressing, and then high frequency quenching and other treatment processes for hardness and toughness. Powder parts have the advantages of high strength, high hardness, high wear resistance, etc., and have gradually In fields such as the automobile industry, replacing traditional metal parts has become the development trend of metal parts in the future. However, for high-frequency heat treatment, the success rate of processing powder parts is quite low. The main reason is that powder parts are made of fine steel particles. Through compression molding, although its density is not smaller than that of ordinary castings, the steel grains are still not completely combined, which leads to th...
Claims
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IPC IPC(8): C21D1/42C21D1/18B22F3/24
CPCC21D1/42C21D1/18B22F3/24B22F2003/248Y02P10/25
Inventor 陈俊良
Owner 鑫光热处理工业(昆山)有限公司