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Heat treatment process for automobile gear shifting box synchronizer gear sheath

A technology of automobile gearboxes and synchronizers, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as parts scrapping, hardened layer depth out of tolerance, and whole furnace product scrapping, so as to reduce the failure rate and scrap rate , Improve labor productivity and avoid product scrapping

Active Publication Date: 2009-07-15
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, pressure quenching, cleaning, tempering, and testing. Before the production of gear sleeve parts, check the water and electricity of the related equipment of the production line, and calibrate the furnace temperature and carbon potential in the converter. In the carbonitriding step, the original carburizing temperature is 870±5℃, the carbon potential is 1.0±0.1%, and the nitrogen infiltration amount is 8-10m 3 / h, methanol infiltration rate is 7~9L / h, propane infiltration rate is 0.9~1.0m 3 / h, the ammonia penetration rate is 50-55L / h. According to different parts and corresponding technical requirements, the cycle time 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±0.05%...

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, pressure quenching, cleaning, tempering, and testing. Before the production of gear sleeve parts, check the water and electricity of the related equipment of the production line, and calibrate the furnace temperature and carbon potential in the converter. In the carbonitriding step, the original carburizing temperature is 870±5℃, the carbon potential is 1.0±0.1%, and the nitrogen infiltration amount is 8-10m 3 / h, methanol infiltration rate is 7~9L / h, propane infiltration rate is 0.9~1.0m 3 / h, the ammonia penetration rate is 50-55L / h. When the equipment fails, 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 ammonia penetrati...

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 inspection. Before the gear sleeve parts are produced, the water and electricity of the related equipment of the production line are checked. , And calibrate the furnace temperature and carbon potential in the converter. In the carbonitriding step, the original carburizing temperature is 870±5℃, the carbon potential is 1.0±0.1%, and the nitrogen infiltration amount is 8-10m 3 / h, methanol infiltration rate is 7~9L / h, propane infiltration rate is 0.9~1.0m 3 / h, the ammonia penetration rate 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 rate is 4~5L / h, propane penetration rate is 0.5~0.6m 3 / h, ...

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PUM

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Abstract

The invention relates to a heat treatment process, which is a heat treatment process for a gear sleeve of an automobile gearbox synchronizer, comprising steps: carbonitriding, press quenching, cleaning, tempering, and testing. When the equipment fails, in the carbonitriding step, The carburizing temperature is 780-850°C, the carbon potential is 0.50-1.0%, the amount of nitrogen added is 5-12m3 / h, the amount of methanol added is 4-7L / h, the amount of propane added is 0.5-0.9m3 / h, ammonia The dosage is 0~30L / h. When a failure occurs, the invention can ensure that the surface hardness, hardened layer, and metallographic structure of the product still meet the technical requirements when the time of the part in the furnace is extended to 10 hours, avoiding the phenomenon of product scrapping caused by equipment failure, and greatly Significantly reduce product failure rate and scrap rate.

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 automobile mechanical shift gearboxes. Its main function is to make the driver's gear shifting operation simple and smooth, and greatly improve the performance of the transmission. Since the gear sleeve of the automobile gearbox synchronizer has high requirements on the mechanical properties and machining accuracy of the material, the quality of its heat treatment is very important. In the prior art, most of the gear sleeves of the automobile gearbox synchronizer are made of low-alloy steel after being carburized or carbonitrided and quenched, and then subjected to a low-temperature tempering heat treatment process. The main heat treatment production process is carried out in different ways due to different production conditions. Some u...

Claims

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Application Information

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