Carburization process for heavy machinery part

A technology for heavy machinery and parts, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve problems such as grinding cracks, cracks or peeling, and reduce the service life of heavy machinery parts, so as to achieve brittleness The effect of improving the fracture resistance, reducing the surface tensile stress, and reducing the tendency of quenching cracking

Inactive Publication Date: 2013-11-20
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Claims
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Problems solved by technology

However, after the heavy machinery parts are carburized by the existing carburizing process, grinding cracks often appear in the subsequent grinding process, which leads to the cracking or peeling of the heavy machinery parts along the cracks during use, thereby reducing the quality of the heavy machinery. Service life of parts

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  • Carburization process for heavy machinery part
  • Carburization process for heavy machinery part

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Embodiment Construction

[0015] figure 1 It is a schematic flow chart of the carburizing process of heavy machinery parts according to the first embodiment of the present invention. Heavy machinery components such as heavy-duty gear shafts. In this embodiment, the heavy-duty gear shaft is, for example, a 20CrMnMo heavy-duty gear shaft. 20CrMnMo is a high-strength carburizing steel, and its main components are (by mass percentage): 0.90-1.20% manganese (Mn), 1.10-1.40% chromium (Cr), 0.20-0.30% molybdenum ( Mo) 0.17-0.23% carbon (C) and 0.17-0.37% silicon (Si).

[0016] Before carburizing parts such as 20CrMnMo heavy-duty gear shafts, preparatory steps for carburizing parts are required. For example, forging, post-forging normalizing, rough turning, quenching and tempering, turning outer circle, both end faces, center hole, addendum circle, gear hobbing and surface cleaning are performed sequentially according to design requirements, which will not be described in detail here. In addition, post-pro...

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Abstract

The invention discloses a carburization process for a heavy machinery part. The process comprises the following steps of: firstly performing carburization on the part, wherein the carburization temperature is 910-950 DEG C; then cooling, namely cooling the part to 780-800 DEG C, and performing air cooling on the part outside a furnace; then performing high-temperature tempering, wherein the high-temperature tempering temperature is 650-680 DEG C; subsequently, quenching; and performing low-temperature tempering. The carburization process for the heavy machinery part can effectively prevent the generation of grinding cracks, so that the service life of the heavy machinery part can be prolonged.

Description

Technical field [0001] The invention relates to a heat treatment process, and in particular to a carburizing process of heavy machinery parts. Background technique [0002] Heavy-duty machinery parts such as heavy-duty gear shafts are usually used in environments with larger work loads, stronger impact forces, and higher safety. Therefore, heavy-duty machinery parts should not only have excellent wear resistance and relatively high In addition to high contact fatigue strength and bending fatigue strength, it should also have high impact resistance and overload resistance. [0003] In order to meet the above performance requirements, in actual production, most of the heavy machinery parts are processed by carburizing process. However, after the heavy machinery parts are carburized by the existing carburizing process, grinding cracks often appear in the subsequent grinding process, which leads to the cracking or peeling of the heavy machinery parts along the cracks during use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/80
Inventor 郭秋彦陈倩李莉刘强杨安志冯擎峰
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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