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Surface deformation-enhanced non-tempered axle shaft manufacturing method

A technology of surface deformation strengthening and manufacturing method, applied in the field of metal processing, can solve the problems of easy deformation of parts, complex process, high energy consumption, etc., and achieve the effect of improving surface hardness and strength, improving mechanical properties, and good comprehensive performance.

Inactive Publication Date: 2019-03-26
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, automobile half shafts are mainly made of quenched and tempered steel. However, due to the complex process of quenching and tempering, the energy consumption in the quenching and tempering process is relatively large, and the pollution is serious. During the quenching process, the parts are prone to deformation and cracking. Therefore, non-quenched and tempered steel, as an environmentally friendly and energy-saving low-cost steel that adopts controlled forging and controlled cooling technology to save quenching and tempering steps, is gradually being developed and applied in auto parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A non-quenched and tempered semi-shaft manufacturing method with surface deformation strengthening, comprising the following steps: (a) selecting raw materials; (b) controlled forging and controlled cooling; (c) local induction normalizing; (d) machining; (e) surface Induction hardening and tempering; (f) Surface deformation strengthening treatment. The raw material is 38MnVS non-quenched and tempered steel bar with a diameter of 40mm, and the composition is: C: 0.35 wt%; Si: 0.664 wt%; S: 0.03 wt%; V: 0.1 wt%; Mn: 1.25 wt%; P: 0.014 wt%; Cr: 0.15 wt%; the rest is Fe. In controlled forging and controlled cooling, the heating temperature for controlled forging is 1050°C; controlled cooling is to cool down to room temperature at a cooling rate of 1.5°C / s. Partial induction normalizing is induction normalizing the spline parts, and the normalizing temperature is 850℃. Then carry out machining; induction quenching is carried out on the surface, the quenching heating tempe...

Embodiment 2

[0027] A non-quenched and tempered semi-shaft manufacturing method with surface deformation strengthening, comprising the following steps: (a) selecting raw materials; (b) controlled forging and controlled cooling; (c) local induction normalizing; (d) machining; (e) surface Induction hardening and tempering; (f) Surface deformation strengthening treatment. The raw material is 38MnVS non-quenched and tempered steel bar with a diameter of 40mm, and the composition is: C: 0.35 wt%; Si: 0.664 wt%; S: 0.03 wt%; V: 0.1 wt%; Mn: 1.25 wt%; P: 0.014 wt%; Cr: 0.15 wt%; the rest is Fe. In controlled forging and controlled cooling, the heating temperature of controlled forging is 1050°C; controlled cooling is to cool down to room temperature at a cooling rate of 1.5°C / s; local induction normalizing is to perform induction normalization on the spline parts, and the normalizing temperature is 850°C. Then carry out machining; induction quenching is carried out on the surface, the quenching ...

Embodiment 3

[0029] A non-quenched and tempered semi-shaft manufacturing method with surface deformation strengthening, comprising the following steps: (a) selecting raw materials; (b) controlled forging and controlled cooling; (c) local induction normalizing; (d) machining; (e) surface Induction hardening and tempering; (f) Surface deformation strengthening treatment. The raw material is 38MnVS non-quenched and tempered steel bar with a diameter of 40mm, and the composition is: C: 0.383wt%; Si: 0.664wt%; S: 0.049wt%; V: 0.113wt%; Mn: 1.37wt%; P: 0.014wt%; Cr: 0.15wt%; the rest is Fe. In controlled forging and controlled cooling, the controlled forging heating temperature is 1100°C; controlled cooling is to control the cooling rate of 2°C / s to cool to room temperature; local induction normalizing is to perform induction normalizing on the spline parts, and the normalizing temperature is 850°C. Then carry out machining; induction quenching is carried out on the surface, the quenching heati...

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Abstract

The invention discloses a surface deformation-enhanced non-tempered axle shaft manufacturing method which comprises the steps of raw material preparing, forging and cooling controlling, local induction normalizing, machining, surface induction quenching and tempering and surface deformation strengthening treatment. 38MnVS non-tempered steel is adopted as raw materials of an axle shaft; a forging and cooling controlling technology is used for forging forming of the non-tempered steel, and uniform microstructures are obtained by local induction normalizing after forging; the axle shaft is then machined through machining; surface induction quenching and tempering are carried out on the surface of the axle shaft; and surface deformation strengthening treatment is carried out, in other words, an impact head with the ultrasonic frequency and high energy density at the room temperature is used for conducting surface impact strengthening, the pressing amount of the impact head on the surface of a workpiece is controlled, a deformation strengthening layer is formed on the surface, the surface deformation layer depth is controlled to be 20 microns to 100 microns, and finally the non-temperedaxle shaft with good tissue uniformity and good fatigue and wear resistance is obtained.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a method for manufacturing a non-quenched and tempered half shaft with surface deformation strengthening. Background technique [0002] With the development of the automobile industry, the material selection characteristics of auto parts tend to be more and more high performance and low energy consumption. At present, automobile half shafts are mainly made of quenched and tempered steel. However, due to the complicated process of quenching and tempering, the energy consumption in the quenching and tempering process is relatively large, and the pollution is serious. During the quenching process, the parts are prone to deformation and cracking. Therefore, non-quenched and tempered steel, as an environmentally friendly and energy-saving low-cost steel that adopts controlled forging and controlled cooling technology to save quenching and tempering steps, is gradually being developed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C21D1/28C21D1/18C21D1/10C21D7/04B23P15/00
CPCB23P15/00C21D1/10C21D1/18C21D1/28C21D7/04C21D9/28C21D2221/00Y02P10/25
Inventor 赵秀明汪杨鑫王安祥陈鸿键毛向阳赵灿杨周刘凯旋
Owner NANJING INST OF TECH
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