Anti-carbonation quenching distortion control method of large-size dual-herringbone gear

A control method, carburizing and quenching technology, applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve problems such as carburizing and quenching distortion of large-sized double herringbone gears, achieve improved contact fatigue strength and bending fatigue, and reduce manufacturing costs , the effect of quality improvement

Inactive Publication Date: 2018-04-20
SHENYANG TURBO MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a large-size double herringbone gear anti-carburizing and quen...

Method used

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  • Anti-carbonation quenching distortion control method of large-size dual-herringbone gear
  • Anti-carbonation quenching distortion control method of large-size dual-herringbone gear
  • Anti-carbonation quenching distortion control method of large-size dual-herringbone gear

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Effect test

Embodiment 1

[0030] The simulated gear material is 12Cr2Ni4 (the chemical composition meets the GB / T3077-1999 standard), and the size of the simulated gear can be found in figure 1 and figure 2 , using it to test the method of anti-carburizing and quenching distortion control of double herringbone gears, including the following steps:

[0031] (1) Preliminary heat treatment: normalizing at 950°C, holding for 5 hours, air cooling; quenching at 860°C, holding for 5 hours, oil cooling, tempering at 650°C, holding for 7.5 hours, air cooling, and conducting metallographic structure inspection, the grain size controlled at level 6.

[0032] (2) Carburizing and quenching furnace: see image 3 and Figure 4, using three-point support tooling, the ratio of the upper surface area of ​​the three-point support tooling to the upper surface area of ​​the original support tooling is 0.2, so that the contact area between the three-point support tooling and the gear is less than 40% of the contact area...

Embodiment 2

[0043] The simulated gear material is 12Cr2Ni4 (the chemical composition meets the GB / T3077-1999 standard), and the size of the simulated gear can be found in figure 1 and figure 2 , using it to test the method of anti-carburizing and quenching distortion control of double herringbone gears, including the following steps:

[0044] (1) Preliminary heat treatment: normalizing at 950°C, holding for 5 hours, air cooling; quenching at 860°C, holding for 5 hours, oil cooling, tempering at 650°C, holding for 7.5 hours, air cooling, and conducting metallographic structure inspection, the grain size controlled at level 6.

[0045] (2) Carburizing and quenching furnace: see image 3 and Figure 4 , using three-point support tooling, the ratio of the upper surface area of ​​the three-point support tooling to the upper surface area of ​​the original support tooling is 0.35, so that the contact area between the three-point support tooling and the gear is less than 40% of the original t...

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Abstract

The invention provides an anti-carbonation quenching distortion control method of a large-size dual-herringbone gear. The anti-carbonation quenching distortion control method comprises the steps thatan existing carburizing and quenching tool is changed into a three-point supporting tool, before quenching charging after carburization, the upper face and the lower face of the gear are exchanged, and metallographic structure examination and the carburizing and quenching process parameter improvement after heat treatment are prepared. The anti-carbonation quenching distortion control method is used for the large-size dual-herringbone carburizing and quenching gear of a turbocompressor. According to the carburizing and quenching gear controlled through the anti-carbonation quenching distortioncontrol method, the deformation amount of the whole carburizing and quenching process is reduced by above 50%, the gear deformation amount is greatly reduced, the gear quality is greatly improved, the contact fatigue strength and bending fatigue are greatly improved, the grinding amount is reduced, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of gear heat treatment, in particular to a method for controlling anti-carburizing and quenching distortion of large-size double herringbone gears. Background technique [0002] At present, the carburizing and quenching distortion of large-sized double herringbone gears is very large. It is often because the deformation after carburizing and quenching is large, and the processing size is not enough for rework. A major difficulty not only affects the production cycle, but also greatly increases the manufacturing cost. [0003] Carburizing and quenching deformation is a worldwide problem. According to the data released by developed countries, the money wasted on carburizing and quenching deformation is quite amazing. At present, for the carburizing and quenching distortion of large-size double herringbone gears, most of them focus on the inspection and analysis of the surface hardness of the distorted gears t...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D1/78C21D6/00C21D9/32C23C8/22
CPCC23F17/00C21D1/78C21D6/004C21D9/32C23C8/22
Inventor 张忠和舒鑫王全振张尔康赵大为张艳梅
Owner SHENYANG TURBO MASCH CORP
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