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Composite carburization quenching technology for gear

A composite infiltration and gear technology, applied in metal material coating process, manufacturing tools, coating and other directions, can solve the problems of long production cycle, high energy consumption, brittleness, etc., to reduce heat treatment energy consumption, optimize process energy saving, shorten the The effect of craft time

Inactive Publication Date: 2014-03-19
常熟市东风齿轮厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional carburizing and quenching heat treatment process is prone to large stress, coarse grains and brittle defects, and the production cycle is long and energy consumption is high, which can no longer meet the performance requirements of key parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A gear compound carburizing and quenching process, comprising the steps of:

[0016] 1) Strong infiltration, drop methanol and kerosene, the drop rate is 170 drops / min, the carbon potential is 1.25cp, the furnace pressure is kept at 25Pa, and the carburizing depth reaches 0.03mm after 60 minutes;

[0017] 2) Diffusion, drop methanol and kerosene, the drop rate is 165 drops / min, the carbon potential is 1.1%cp, the furnace pressure is kept at 25Pa, keep it for 40 minutes, and the carburizing depth reaches 0.05 mm;

[0018] 3) Cool down, when the temperature drops to 560°C, stay isothermally for 1 hour and then cool down;

[0019] 4) Quenching heating, the quenching temperature of the first stage is 865°C, and the quenching temperature of the second stage is 835°C;

[0020] 5) Tempering, the tempering temperature is 260°C.

Embodiment 2

[0022] A gear compound carburizing and quenching process, comprising the steps of:

[0023] 1) Strong infiltration, drop methanol and kerosene, the drop rate is 176 drops / min, the carbon potential is 1.28%cp, the furnace pressure is kept at 27Pa, and the carburizing depth reaches 0.035mm for 63 minutes;

[0024] 2) Diffusion, drop methanol and kerosene, the drop rate is 168 drops / min, the carbon potential is 1.3%cp, the furnace pressure is kept at 26Pa, and the carburizing depth reaches 0.054mm for 44 minutes;

[0025] 3) Cool down, when the temperature drops to 570°C, stay isothermally for 1.5 hours and then cool down;

[0026] 4) Quenching heating, the quenching temperature of the first stage is 866°C, and the quenching temperature of the second stage is 838°C;

[0027] 5) Tempering, the tempering temperature is 262°C.

Embodiment 3

[0029] A gear compound carburizing and quenching process, comprising the steps of:

[0030] 1) Strong infiltration, drop methanol and kerosene, the drop rate is 180 drops / min, the carbon potential is 1.3%cp, the furnace pressure is kept at 30Pa, and the carburizing depth reaches 0.04mm for 65 minutes;

[0031] 2) Diffusion, drop methanol and kerosene, the drop rate is 170 drops / min, the carbon potential is 1.5%cp, the furnace pressure is kept at 28Pa, keep for 45 minutes, and the carburizing depth reaches 0.06mm;

[0032] 3) Cool down, when the temperature drops to 580°C, stay isothermally for 2 hours and then cool down;

[0033] 4) Quenching heating, the quenching temperature of the first stage is 870°C, and the quenching temperature of the second stage is 845°C;

[0034] 5) Tempering, the tempering temperature is 265°C.

[0035]

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PUM

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Abstract

A disclosed composite carburization quenching technology for a gear comprises the following steps: 1) performing strong carburization; 2) performing diffusion; 3) cooing to 560-580 DEG C, staying at the constant temperature for 1-2 h and cooling; 4) quenching and heating, wherein the first-stage quenching temperature is 865-870 DEG C and the second-stage quenching temperature is 835-845 DEG C; and 5) tempering with a temperature of 260-265 DEG C. The provided composite carburization quenching technology for the gear is reduced in heat processing energy consumption and helps to improve the performances of heavy-duty gears.

Description

technical field [0001] The invention relates to a compound carburizing and quenching process for gears. Background technique [0002] Heavy-duty gears have strong impact force, large load capacity, and high safety requirements. In addition to excellent wear resistance, they should also have high bending fatigue strength and contact fatigue strength, as well as high resistance to overload and impact capability. The traditional carburizing and quenching heat treatment process is prone to defects such as large stress, coarse grains and brittleness, and has a long production cycle and high energy consumption, which can no longer meet the performance requirements of key components. Contents of the invention [0003] The purpose of the present invention is to provide a compound carburizing and quenching process for gears, which reduces heat treatment energy consumption and improves the performance of heavy-duty gears. [0004] In order to achieve the above object, the technica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/32C21D1/19C21D9/32
Inventor 万小华
Owner 常熟市东风齿轮厂
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