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Heat treatment technology for powder part

A technology of powder parts and preheat treatment, applied in the field of metal heat treatment process, can solve the problems of incomplete combination of steel particles, separation and cracks of steel particles, etc., to achieve high qualification rate, reduce the probability of cracks, and easy operation.

Inactive Publication Date: 2016-07-13
QINGDAO QINDE RIGGING HARDWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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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-freq...

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Abstract

The invention discloses a heat treatment technology for a powder part, and the heat treatment technology is a technology for performing high-frequency heat treatment on the powder part. The heat treatment technology comprises the following steps: 1), preheating: carrying out preheating treatment on the powder part; 2) air cooling: naturally cooling the powder part for 0.1-1 second in the air; 3) heating: heating the powder part to 800-900 DEG C; 4) air cooling: naturally cooling the powder part for 0.1-2 seconds in the air; and 5) cooling: putting the powder part in a quenching liquid, and cooling for 3-5 seconds. According to precious experience obtained from repeated experiments, the temperature difference inside and outside the powder part in the heating process is reduced through adding the steps of air cooling so as to reduce the possibility of occurrence of cracks; the control temperature and the keeping time in each step are compared through repeated experiments, so as to achieve an optimal effect. The heat treatment technology for the powder part is the improvement based on the conventional equipment and technology, and has the advantages of simplicity, easiness for operation, high pass percentage 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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Application Information

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IPC IPC(8): C21D6/00B22F3/24
Inventor 范勤德
Owner QINGDAO QINDE RIGGING HARDWARE