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Combined carburizing and quenching process for improving gear performance

A composite infiltration and performance technology, applied in the field of quenching, can solve the problems of long production cycle, high energy consumption, coarse grains, etc., and achieve the effect of reducing heat treatment energy consumption, shortening process time, and optimizing process energy saving.

Inactive Publication Date: 2012-10-03
HANGZHOU BRANCH ZHEJIANG GEELY AUTOMOBILE RES INST +2
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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 defects such as coarse grains, brittleness and high stress, and has high energy consumption and long production cycle, which can no longer meet the performance requirements of key parts

Method used

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  • Combined carburizing and quenching process for improving gear performance
  • Combined carburizing and quenching process for improving gear performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take the gear made of alloy steel material (20CrMo), enter the furnace when the furnace temperature of the carburizing furnace is 810 to 820 degrees, because the gear enters, the furnace temperature decreases, and the temperature is raised when the furnace temperature drops to 740 degrees. At the same time, start the exhaust system to exhaust the furnace so that the furnace pressure is controlled at 15Pa, and the carbon potential is 1%cp to carry out the strong carburizing stage. After keeping for about 120 minutes, sampling, when the carburizing depth reaches 0.02 to 0.03 mm, the strong infiltration stage ends, and the carbon potential is controlled to 1.0% cp to carry out the diffusion stage. After holding for 80 minutes, sampling, and the carbon depth can be ended when it reaches 0.04 to 0.05 mm . After the heating is stopped, the furnace temperature of the carburizing furnace decreases slowly, and when it drops to 600 ° C, it is kept at a constant temperature for 2 ...

Embodiment 2

[0033] Take the gear made of alloy steel material (20CrMnTi), enter the furnace when the furnace temperature of the carburizing furnace is 810 to 820 degrees, because the gear enters, the furnace temperature drops, and the furnace temperature is raised when the furnace temperature drops to 750 degrees. At the same time, start the exhaust system to exhaust the furnace so that the furnace pressure is controlled at 15Pa, and the carbon potential is 1.1%cp to carry out the strong carburizing stage. After keeping for about 100 minutes, sampling, when the carburizing depth reaches 0.02 to 0.03 mm, the strong infiltration stage ends, and the carbon potential is controlled at 0.9% cp to carry out the diffusion stage. After keeping for 70 minutes, sampling, and the carbon depth reaches 0.04 to 0.05 mm. It can end . After the heating is stopped, the furnace temperature of the carburizing furnace decreases slowly, and when it drops to 610 ° C, it is kept at a constant temperature for 1.5...

Embodiment 3

[0036] Take the gear made of alloy steel material (20CrMnMo), enter the furnace when the furnace temperature of the carburizing furnace is 810 to 820 degrees, because the gear enters, the furnace temperature drops, and the furnace temperature is raised when the furnace temperature drops to 760 degrees. At the same time, start the exhaust system to exhaust the furnace so that the furnace pressure is controlled at 15Pa, and the carbon potential is 1.2%cp to carry out the strong carburizing stage. After keeping for about 100 minutes, sampling, when the carburizing depth reaches 0.02 to 0.03 mm, the strong infiltration stage ends, and the carbon potential is controlled to 1.0%cp to carry out the diffusion stage. After keeping for 70 minutes, sampling, and the carbon depth can be ended when it reaches 0.04 to 0.05 mm . After the heating is stopped, the furnace temperature of the carburizing furnace decreases slowly, and when it drops to 620 degrees, it is kept at a constant tempera...

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Abstract

The invention relates to a combined carburizing and quenching process for improving gear performance, which comprises the steps of intensive carburization with carbon potential of 1.0-1.2% cp, diffusion with carbon potential of 0.8-1.0% cp, cooling after temperature decreases to 600-620 DEG C and is constant for 1-2 hours, quenching heating, and tempering, wherein quenching heating is divided into a first stage and a second stage, and the quenching temperature at the second stage is higher than that at the first stage. The combined carburizing and quenching process has the advantages that carburization, isothermality and quenching are combined, so that the process time is shortened, the energy consumption in heat treatment is reduced, the technology energy saving is optimized, and the technical indicators of carburizing heat treatment for heavy-duty gear, including surface hardness, abrasion resistance, fatigue strength, and strength and toughness of the core, are effectively enhanced.

Description

technical field [0001] The invention relates to quenching technology, in particular to a composite carburizing and quenching process for improving gear performance. Background technique [0002] With the development of the automobile industry, lightweight has become the development trend of the automobile industry. Therefore, the technology and process of improving the strength of automobile parts are more and more valued by the automobile industry. Since most auto parts need to use high-strength and wear-resistant materials, especially the heavy-duty gears and gear shafts in the engine and drive system, carburizing and quenching processes are used. [0003] Heavy-duty gears have large load capacity, strong impact force, and high safety requirements. In addition to excellent wear resistance, they should also have high contact fatigue strength and bending fatigue strength, as well as high impact resistance and overload resistance. ability. The traditional carburizing and qu...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D1/18C21D9/32C23C8/22C23C8/20
Inventor 郭秋彦陈倩李莉刘强杨安志赵福全
Owner HANGZHOU BRANCH ZHEJIANG GEELY AUTOMOBILE RES INST
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