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Vacuum low-pressure carburizing process for shaft gear parts

A vacuum low-pressure carburizing and process technology, applied in metal material coating process, furnace type, manufacturing tools, etc., can solve problems such as large deformation of keyway and tooth shape, eliminate machining stress, improve surface carburizing effect, The effect of reducing the amount of deformation

Pending Publication Date: 2022-04-08
常州新区河海热处理工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-precision shaft gear parts, the requirements for tooth profile accuracy are very high, such as figure 1 The tooth shape distortion of the shaft tooth parts shown is required to be controlled within 0.015-0.025mm, but the existing vacuum low-pressure carburizing process still has the problem of excessive deformation of the keyway and tooth shape

Method used

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  • Vacuum low-pressure carburizing process for shaft gear parts
  • Vacuum low-pressure carburizing process for shaft gear parts
  • Vacuum low-pressure carburizing process for shaft gear parts

Examples

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Embodiment 1

[0046] by figure 1 Take the input shaft gear part of an industrial robot reducer as an example. The material of the shaft gear part is SCM420H alloy steel. The technical requirements for heat treatment are: the effective hardened layer depth (PCD 550HV) of the carburized layer is 0.425-0.775mm, and the surface hardness It is 80.1~82.5HRA, and the tooth shape distortion is 0.015~0.025mm.

[0047] In order to meet the above-mentioned heat treatment technical requirements, a vacuum low-pressure carburizing process for shaft and tooth parts in this embodiment includes a heating stage, a carburizing stage and a quenching stage in sequence. In the heating stage, the workpiece is framed and placed in the furnace, using figure 2In the stepped heating and heat preservation process shown, the vacuum in the furnace is controlled below 1Pa, and the workpiece is heated up to 300±5°C, and the temperature is averaged for 20 minutes; the temperature is raised to 480±5°C, and the temperature...

Embodiment 2

[0051] A vacuum low-pressure carburizing process for shaft-tooth parts in this embodiment also uses figure 1 The input shaft gear part of an industrial robot reducer shown as an example, its basic process flow is the same as that of Embodiment 1, the difference lies in:

[0052] In the heating stage, the vacuum degree in the furnace is controlled below 1Pa, and the workpiece is heated up to 300±5°C, and the temperature is averaged for 40 minutes; the temperature is raised to 480±5°C, and the temperature is averaged for 40 minutes; To 780±5°C, average temperature for 40 minutes; heat up to 850±5°C, average temperature for 40 minutes; heat up to 960°C, reach the carburizing process temperature, and enter the carburizing stage.

[0053] In the carburizing stage, the furnace pressure is controlled at 820-850Pa. In the strong infiltration stage, the acetylene gas is passed in for 20 seconds, and then the nitrogen gas is passed in for 40 seconds, which is a carburizing pulse cycle. ...

Embodiment 3

[0056] A vacuum low-pressure carburizing process for shaft-tooth parts in this embodiment also uses figure 1 The input shaft gear part of an industrial robot reducer shown as an example, its basic process flow is the same as that of Embodiment 1, the difference lies in:

[0057] In the heating stage, the vacuum degree in the furnace is controlled below 1Pa, and the workpiece is heated up to 300±5°C, and the temperature is averaged for 30 minutes; the temperature is raised to 480±5°C, and the temperature is averaged for 30 minutes; To 780±5°C, average temperature for 30 minutes; heat up to 850±5°C, average temperature for 30 minutes; heat up to 950°C, reach the carburizing process temperature, and enter the carburizing stage.

[0058] In the carburizing stage, the furnace pressure is controlled at 850-880Pa. In the strong infiltration stage, acetylene gas is introduced for 10 seconds, and then nitrogen gas is passed in for 20 seconds, which is a carburizing pulse cycle. The ent...

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Abstract

The invention discloses a vacuum low-pressure carburizing process for shaft gear parts, and belongs to the technical field of heat treatment. The vacuum low-pressure carburizing process for the shaft-gear parts sequentially comprises the temperature rising stage, the carburizing stage and the quenching stage, the temperature rises to the carburizing process temperature in a stepped temperature rising and heat preservation mode in the temperature rising stage, the machining stress of the shaft-gear parts can be eliminated, and the deformation amount of the parts in the heating process is reduced; the carburizing deformation of the shaft gear part reaches 0.005-0.015 mm, so that the problem of distortion generated in the carburizing process of the shaft gear part is effectively solved; moreover, in the vacuum low-pressure intense carburizing stage, acetylene-nitrogen alternating pulses are used as carburizing atmosphere, waste gas generated in the furnace is exhausted through nitrogen, the effective carburizing layer depth and the surface carbon content are controlled more accurately, and the shaft gear part surface carburizing effect is improved.

Description

technical field [0001] The invention relates to a heat treatment process, more specifically, to a vacuum low-pressure carburizing process for shaft-tooth parts. Background technique [0002] Shaft gear parts are widely used in industrial technology. Such as figure 1 As shown, it is an input shaft tooth part of an industrial robot reducer, one end has a tooth structure 1, and the other end has a blind hole 2, and the blind hole 2 is provided with a keyway 3, its main function is to transmit torque, and the working conditions are relatively Complex, it is required to have excellent wear resistance, contact fatigue resistance and bending fatigue resistance. [0003] Carburizing and quenching is a common heat treatment process to obtain high hardness on the surface of the workpiece to improve the wear resistance of the workpiece. In order to obtain good wear resistance of the above-mentioned shaft and tooth parts, it is also necessary to carry out carburizing treatment. The m...

Claims

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Application Information

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IPC IPC(8): C23C8/22C23C8/02C23C8/80C21D1/18C21D1/773C21D9/28C21D9/32
Inventor 殷和平殷敏洁
Owner 常州新区河海热处理工程有限公司
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