Heat treatment process for automobile gear shifting box synchronizer gear sheath

A technology of automobile gearbox and synchronizer, which is applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc. The effect of increasing labor productivity and reducing reject and scrap rates

Active Publication Date: 2007-10-24
NANJING AUTOMOBILE GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the characteristics and use of the process, in the specific implementation process, the time limit for troubleshooting is set in the equipment as 30 minutes, that is, any failure of the equipment must be eliminated within 30 minutes. If it exceeds 30 minutes, the pressure quenching furnace The quality of the inner synchronizer gear sleeve will be seriously affected due to overtime carburization, resulting in out-of-tolerance hardened layer depth or out-of-tolerance metallographic structure, and even the entire furnace parts will be scrapped
However, in the actual production process, it is often impossible to complete the troubleshooting within the time limit of 30 minutes. The maintenance time of the product due to the fault is too long, resulting in poor product quality, and sometimes the entire furnace product is scrapped.
Since the parts in the furnace are often unable to come out of the furnace when the equipment fails, the possible maintenance time of the equipment can only be extended by adjusting the carburizing process parameters under the premise of ensuring the safety of the equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment is a heat treatment process for the gear sleeve of an automobile gearbox synchronizer, which is carried out according to the following steps: carbonitriding, press quenching, cleaning, tempering, and testing. Before the gear sleeve parts are produced, the water and electricity of the related equipment of the production line are checked, and the furnace temperature and carbon potential in the converter are calibrated. In the carbonitriding step, the original carburizing temperature is 870±5°C, the carbon potential is 1.0±0.1%, and the infiltration amount of nitrogen is 8-10m 3 / h, methanol penetration is 7-9L / h, propane penetration is 0.9-1.0m 3 / h, the amount of ammonia infiltration is 50-55L / h. According to different parts and corresponding technical requirements, the tempo of the automatic production line is set to 72-84s. When the equipment fails, in the carbonitriding step, adjust the carburizing temperature to 845±5°C, the carbon potential to 0.95...

Embodiment 2

[0015] This embodiment is a heat treatment process for the gear sleeve of an automobile gearbox synchronizer, which is carried out according to the following steps: carbonitriding, press quenching, cleaning, tempering, and testing. Before the gear sleeve parts are produced, the water and electricity of the related equipment of the production line are checked, and the furnace temperature and carbon potential in the converter are calibrated. In the carbonitriding step, the original carburizing temperature is 870±5°C, the carbon potential is 1.0±0.1%, and the infiltration amount of nitrogen is 8-10m 3 / h, methanol penetration is 7-9L / h, propane penetration is 0.9-1.0m 3 / h, the amount of ammonia infiltration is 50-55L / h. When the equipment breaks down, in the carbonitriding step, the carburizing temperature is 800±5℃, the carbon potential is 0.55±0.05%, and the nitrogen infiltration amount is 9~10m 3 / h, methanol penetration is 5-7L / h, propane penetration is 0.6-0.7m 3 / h, the...

Embodiment 3

[0017] This embodiment is the heat treatment process of the gear sleeve of the automobile gearbox synchronizer, which is carried out according to the following steps: carbonitriding, press quenching, cleaning, tempering, and testing. Before the gear sleeve parts are produced, the water and electricity of the production line related equipment are checked. , and calibrate the furnace temperature and carbon potential in the converter. In the carbonitriding step, the original carburizing temperature is 870±5°C, the carbon potential is 1.0±0.1%, and the infiltration amount of nitrogen is 8-10m 3 / h, methanol penetration is 7-9L / h, propane penetration is 0.9-1.0m 3 / h, the amount of ammonia infiltration is 50-55L / h. When the equipment fails, in the carbonitriding step, the carburizing temperature is 785±5°C, the carbon potential is 0.55±0.05%, and the nitrogen infiltration amount is 10-12m 3 / h, methanol penetration is 4-5L / h, propane penetration is 0.5-0.6m 3 / h, the amount of a...

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PUM

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Abstract

The invention discloses a heat disposing technique of gear coat of automobile gear box synchronizer, which comprises the following steps: copenetrating carbon and nitrogen at 780-850 deg. c; quenching; cleaning; annealing; testing; setting the carbon potential at 0. 50-1. 0%, nitrogen adding quantity at 5-12m3/h, carbinon adding quantity at 4-7L/h, propane adding quantity at 0. 5-0. 9m3/h and ammonia gas adding quantity at 0-30L/h.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a heat treatment process for a gear sleeve of an automobile gearbox synchronizer. Background technique [0002] Synchronizer gear sleeves are widely used in mechanical shifting gearboxes of automobiles. Its main function is to make the driver's gear shifting easy and smooth, and greatly improve the performance of the transmission. Since the gear sleeve of the synchronizer of the automobile gearbox has high requirements on the mechanical properties and machining accuracy of the material, its heat treatment quality is very important. In the prior art, the gear sleeves of the synchronizer of the automobile gearbox are mostly made of low-alloy steel, which is quenched by carburizing or carbonitriding, and then subjected to a heat treatment process of low-temperature tempering. The main heat treatment production process is carried out in different ways due to different production condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/30C21D9/32
Inventor 钮洪康方和杰
Owner NANJING AUTOMOBILE GROUP CORP
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