Process for machining parts of automobile gear box by using 20CrMnTi steel

A technology for automotive gearboxes and parts, applied in metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effects of preventing crack tendency, good reproducibility, and improving mechanical properties

Inactive Publication Date: 2012-08-01
温州天和汽车部件有限公司
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[0007] The relevant details of the present invention will be described in further detail below.

[0008] This process of processing 20CrMnTi steel into automotive gearbox parts has the following steps: forging, preliminary heat treatment, machining, carburizing and quenching, and grinding. During carburizing and quenching, carburizing is carried out at a temperature of 910 to 930 degrees Celsius , this embodiment chooses carburizing at 920±10°C, heat preservation for 5-7 hours, and monitors the amount of carburizing agent dripped during carburizing, so that the carbon potential in the carburizing furnace is controlled within the range of 0.85-1.0, which is the best during monitoring Use an oxygen probe for automatic monitoring. If the oxygen probe cannot be used, it is also possible to manually adjust the amount of carburizing agent; then cool the carburizing furnace to 830-850 degrees Celsius, and directly quench the residual austenite after pre-cooling out of the furnace. Th...

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Abstract

The invention discloses a process for machining parts of an automobile gear box by using 20CrMnTi steel. The process is characterized by comprising the following steps of forging, carrying out preheat treatment, mechanically machining, carburizing and quenching, and grinding, wherein in a carburizing and quenching process, carburization is carried out at a temperature of 910-930 DEG C and a dripping amount of a carburizer is monitored when the carburization is carried out, so that the carbon potential in a carburizing furnace is controlled within a range from 0.85 to 1.0; the temperature of the carburizing furnace is cooled to a temperature of 830-850 DEG C; a quenching process is executed directly after a material is discharged and pre-cooled, so that the residual austenitic amount is controlled to be less than or equal to 10%; a tempering temperature is raised, wherein the tempering temperature is less than or equal to 250 DEG C; temperature-preservation time in a tempering process is prolonged to ensure the rigidity of a carburizing layer; and finally, shot blasting is carried out to improve pressing stress. With the adoption of the treatment process, no crack occurs in a grinding process and the percent of pass of machined parts reaches 100%.

Description

technical field [0001] The invention relates to a processing technology for processing metal materials into automobile gearbox parts. Background technique [0002] The parts in the automobile gearbox, such as the reverse intermediate gear shaft, the spacer sleeve, the gear, etc., are made of 20CrMnTi steel, which has a complex shape and a large difference in thickness. It is a key and important part of the car. High, where the carburizing depth is required to be between 0.84-1.34, and the surface hardness is required to be 58-64HRC. The processing technology of this kind of automotive reverse intermediate gear shaft and other parts basically includes forging, preliminary heat treatment, machining, carburizing and quenching, grinding and other steps, and most small factories unconditionally purchase high-grade carburizing and quenching equipment. They are all carried out in a well-type carburizing furnace without carbon potential control. The amount of carburizing agent drip...

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C23F17/00
Inventor 陈建成
Owner 温州天和汽车部件有限公司
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