Carburizing heat treatment process for fatigue-resistant metal sliding block

A technology of fatigue resistance and sliding block, applied in the field of heat treatment, can solve the problem of reducing the ability of inward diffusion, and achieve the effect of smoothing the hardness gradient and improving the contact fatigue performance.

Pending Publication Date: 2021-09-03
KUNSHAN SUNMIN DRILUBE ELECTRONIC MATERIAL TECHNOLOGY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] 1) Due to long-time carburization, carbon accumulates on the surface and the ability to diffuse inward is reduced;

Method used

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  • Carburizing heat treatment process for fatigue-resistant metal sliding block

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Comparison scheme
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Embodiment Construction

[0024] see figure 1 , CP in the figure refers to the carbon potential in the furnace.

[0025] The carburizing heat treatment process of the fatigue-resistant metal slider includes the following steps:

[0026] S1. Put the slider into the preheating furnace to preheat to 350°C, and the preheating time is 1h;

[0027] S2. Put the slider into a box-type controlled atmosphere carburizing furnace for carburizing and quenching; specifically include

[0028] S21, soaking to 880°C, soaking time is 0.5h, CP is 0.4;

[0029] S22. Heating to 935°C for the first intensive infiltration for 2.5 hours and a CP of 1.3; for the first diffusion for 2 hours and a CP of 1.1; then for the second intensive infiltration for 4 hours and a CP of 1.3 It is 1.2; then carry out the second diffusion, the time is 2.5h, and the CP is 1.0; prevent one-stage high carbon potential and strong infiltration from causing surface carbon accumulation and cementite; the design of decreasing carbon potential makes...

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Abstract

A carburizing heat treatment process for a fatigue-resistant metal sliding block comprises the steps that S1, the sliding block is preheated to 350 DEG C, and the preheating time is 1 h; S2, the sliding block is subjected to carburizing and quenching; S3, the sliding block is subjected to cryogenic cooling, wherein the temperature is minus 80 DEG C, and the time is 2 h; and S4, the sliding block is tempered, wherein the temperature is 240 DEG C, and the time is 3 h. According to the carburizing heat treatment process for the fatigue-resistant metal sliding block, controllable atmosphere carburization is adopted, multiple stages of strong carburization and diffusion are alternately carried out, it is avoided that carbon is gathered on the surface to form cementite, and meanwhile a carburized layer has a good and gentle hardness gradient; and then, in combination with the modes of conducting carburizing slow cooling and conducting two times of heating and quenching, extremely fine cryptocrystalline martensite is obtained, then the retained austenite is further reduced through cryogenic treatment, and therefore the contact fatigue resistance of the sliding block is improved.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a carburizing heat treatment process of a fatigue-resistant metal slider. Background technique [0002] In the automation equipment, the slider is the main structural part of a reciprocating motion, and its performance determines the durability and stability of the automatic operation equipment. In special occasions, the reciprocating motion may be as high as 1000 times per minute, which puts forward extremely high requirements on the heat treatment performance of the slider. [0003] The disadvantages of the traditional carburizing heat treatment process are: more cementite appears in the carburized layer, resulting in reduced performance. [0004] The reasons for the above disadvantages are: [0005] 1) Due to long-time carburization, carbon accumulates on the surface and the ability to diffuse inward is reduced; [0006] 2) The control of carbon potential by vacuum carburizing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/22C23C8/80C21D6/04C21D1/18C21D9/00
CPCC23F17/00C23C8/22C23C8/80C21D6/04C21D1/18C21D9/0068C21D2211/008
Inventor 王建才
Owner KUNSHAN SUNMIN DRILUBE ELECTRONIC MATERIAL TECHNOLOGY CO LTD
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