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High carbon chromium bearing parts surface chemical heat-treatment process

A high-carbon chromium bearing and surface chemistry technology, used in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc.

Active Publication Date: 2006-07-19
CHONGQING CHANGJIANG BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this equipment and process have not been applied to high carbon chromium bearing parts

Method used

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  • High carbon chromium bearing parts surface chemical heat-treatment process
  • High carbon chromium bearing parts surface chemical heat-treatment process

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Experimental program
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Effect test

Embodiment 1

[0061]Embodiment 1, the processing technology of high carbon chromium bearing inner ring includes the following steps:

[0062] (1) High-carbon chromium raw materials are sequentially forged, annealed, and turned into bearing inner rings. The initial forging temperature is 1150°C, the final forging temperature is 850°C; the annealing temperature is 800°C, and the time is 15h.

[0063] (2) Set the process and process parameters on the control panel of the push rod carbonitriding production line,

[0064] Process: pre-cleaning → pre-oxidation → carbonitriding → cooling diffusion → quenching → post-cleaning → tempering;

[0065] Parameters: pre-cleaning 0.3h; pre-oxidation temperature 350°C, time 1h; carbonitriding temperature 850°C, time 3h, carbon potential 1.4%; carbon nitrogen diffusion start temperature 850, cut-off temperature 820°C, time 2h, carbon potential 0.9%; Ammonia flow rate 0.5m 3 / h; quenching temperature 820°C, quenching oil temperature 80°C; post-cleaning 0.4h...

Embodiment 2

[0076] Embodiment 2, the processing technique of high-carbon chromium bearing steel ball comprises the following steps:

[0077] (1) High-carbon chromium raw materials are sequentially cold-headed and polished into steel balls.

[0078] (2) Set the process and process parameters on the control panel of the multi-purpose furnace,

[0079] Process: pre-cleaning → pre-oxidation → carbonitriding → cooling diffusion → quenching → post-cleaning → tempering;

[0080] Parameters: pre-cleaning 0.8h; pre-oxidation temperature 400°C, time 1.5h; carbonitriding temperature 880°C, time 6h, carbon potential 1.5%; carbon nitrogen diffusion start temperature 880°C, end temperature 850°C, time 4h, carbon Potential 0.8%; ammonia gas flow 3m 3 / h; quenching temperature 850°C, quenching oil temperature 80°C; post-cleaning 1h; tempering temperature 250°C, time 4h.

[0081] (3) Load the processed bearing steel balls into the transfer car, start the program, the transfer car advances along the tra...

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Abstract

The disclosed surface chemical thermal treatment technique for a high-C-Cr bearing comprises: setting parameters, front cleaning, pre-oxidizing, heating, carbonitriding, cooling to diffuse, quenching, and tempering. This invention uses the treatment device in vehicle and motor cycle gear process to form one layer with special tissue and improve contact fatigue strength and surface hardness.

Description

technical field [0001] The invention relates to a surface treatment method for metal parts, in particular to a surface chemical heat treatment process for high-carbon chromium bearing parts. Background technique [0002] For the quenching and tempering treatment of high-carbon chromium bearing parts such as the inner ring and the outer ring, the continuous mesh belt furnace is usually used to directly heat the quenching and tempering process. The typical process of conventional heat treatment of ferrules is as follows: [0003] Cold rolled parts (or turned parts) → (quenching and tempering production line) → pre-cleaning → heating → heat preservation → quenching → post-cleaning → tempering → grinding, the heat treatment curve is as follows figure 1 shown. [0004] Due to the continuous improvement of users' requirements on bearing life, and the bearing life is directly restricted by the quality of steel, it is very difficult to greatly improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/30C21D9/40C21D1/18C21D11/00
Inventor 赵兴新郑建明范玉龙
Owner CHONGQING CHANGJIANG BEARING
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