Heat treatment process for powder part
A technology of powder parts and preheat treatment, which is applied in the field of metal heat treatment technology, can solve the problems of steel grain separation cracks, steel grains not completely combined together, etc., achieve high pass rate, easy operation, and reduce the probability of crack occurrence.
Inactive Publication Date: 2017-05-31
格润德(青岛)新型环保建材有限公司
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Problems solved by technology
The main reason is that since the powder parts are formed by pressing fine steel particles, although their 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, resulting in Separation of steel particles to form cracks
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016] Specific embodiments of the present invention will be further described in detail below.
[0017] The heat treatment process of powder parts of the present invention is a process of using a high frequency machine to perform high frequency heat treatment on powder parts: output power (S98)-heating (1.5 seconds)-cooling (6 seconds). And the technique of the present invention is: output power (S50)--preheating (0.6 seconds)--air cooling (0.5 seconds)--output power (S96)-formal heating (1.3 seconds)-cooling (4 seconds). Specifically, include:
[0018] 1) Preheating, the output power is reduced by 50% and the preheating action is performed first to improve the rapid heating situation. The powder parts are preheated in the high-frequency machine to heat them to 300-500°C; after repeated comparisons, other conditions are the same In the range of 300-500 °C, the probability of cracks in powder parts is the smallest when preheating to 350 °C;
[0019] 2) Air cooling, the high-...
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The invention discloses a heat treatment process for a powder part. The heat treatment process is a process for carrying out high-frequency heat treatment on the powder part. The heat treatment process includes the following steps of 1, preheating, wherein the powder part is preheated; 2, air cooling, wherein the powder part is naturally cooled for 0.1-1 second in air; 3, heating, wherein the powder part is heated to 800-900 DEG C; 4, air cooling, wherein the powder part is naturally cooled for 0.1-2 seconds in the air; and 5, cooling, wherein the powder part is put in quenching liquid to be cooled for 3-5 seconds. The heat treatment process is valuable experience obtained through repeated experiments, by adding the step of air cooling, the temperature difference between the inside and the outside of the powder part in the heating process is reduced, and the probability of generating cracks is reduced accordingly; and the control temperatures and retention times of all the steps are compared through repeated experiments to obtain the optimal effect. The heat treatment process for the powder part is improved based on existing equipment and process, and has the beneficial effects of being simple, easy to operate, high in percent of pass and the like.
Description
technical field [0001] The invention relates to a metal heat treatment process, in particular to a high-frequency quenching heat treatment process for powder parts. Background technique [0002] Powder parts are a kind of heat treatment for hardness and toughness by pressing metal powder through high temperature and high pressure, and then performing high frequency quenching and other treatment processes. Powder parts have the advantages of high strength, high hardness, and high wear resistance. At present, they have gradually replaced traditional metal parts in the automotive industry and other fields, and become the development trend of metal parts in the future. But for high-frequency heat treatment, the success rate of processing powder parts is quite low. The main reason is that since the powder parts are formed by pressing fine steel particles, although their density is not smaller than that of ordinary castings, the steel particles are still not fully combined, which...
Claims
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Login to View More IPC IPC(8): B22F3/24
CPCB22F3/24B22F2003/248
Inventor 黄亚楠
Owner 格润德(青岛)新型环保建材有限公司