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Non-quenched-tempered half axle and manufacturing method thereof

A manufacturing method, non-quenching and tempering technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve problems such as large energy consumption, quenching deformation, and aggravated environmental pollution, so as to simplify the production process, avoid quenching deformation, and reduce environmental pollution Effect

Active Publication Date: 2017-12-15
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most automobile half shafts are made of quenched and tempered steel. The tedious processes of quenching and tempering and straightening lead to high production cost and high energy consumption, which aggravates environmental pollution, and there are quality problems such as quenching deformation and cracking, which are closely related to the development of the automobile industry. energy saving and emission reduction in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for manufacturing a non-quenched and tempered half shaft, comprising: blanking → induction heating → pre-forging → final forging → trimming → straightening → controlled cooling → induction normalizing → machining → surface induction hardening and tempering. The φ60 38MnVS bar is firstly heated to 1250°C by induction; the flange and spline parts of the workpiece are partially forged through the pre-forging and final forging processes, and the final forging temperature is 1100°C; after forging, edge trimming and Straightening, the temperature of the workpiece after trimming is about 1000°C, and the temperature of the workpiece after straightening is about 960°C. After straightening, enter the controlled cooling process, place the workpiece in the air, and cool it to room temperature at a cooling rate of about 1.8°C / s. 950°C induction normalizing is performed on the spline part of the workpiece, and the whole workpiece is treated by surface induction hardening aft...

Embodiment 2

[0015] A method for manufacturing a non-quenched and tempered half shaft, comprising: blanking → induction heating → pre-forging → final forging → trimming → straightening → controlled cooling → machining → surface induction hardening and tempering. The 38MnVS bar with φ25 is firstly heated to 950°C by induction; the flange and spline parts of the workpiece are partially forged through the pre-forging and final forging processes, the pre-forging temperature is 950°C, and the final forging temperature is 850°C; forging After trimming and straightening, the temperature of the workpiece after trimming is about 820°C, and the temperature of the workpiece after straightening is about 780°C. After straightening, enter the controlled cooling process, place the workpiece in the air, and cool it to room temperature at a cooling rate of about 1.8°C / s. Carry out 800°C induction normalization on the spline part of the workpiece, and use surface induction hardening to treat the whole workp...

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Abstract

The invention relates to a non-quenched-tempered half axle and a manufacturing method thereof. The manufacturing method comprises the following steps: carrying out blanking; carrying out induction heating; carrying out pre-forging; carrying out final forging; carrying out trimming; carrying out straightening; carrying out controlled cooling; carrying out induction normalization; carrying out machining; and carrying out surface induction quenching and tempering. A 38MnVS bar material with the size of phi25 to phi60 is adopted and a flange plate and a spline part of a workpiece are forged through a forging procedure; then the workpiece is put into the air in a dispersed manner and is cooled to a room temperature at a cooling speed of about 1.8 DEG C / s; then the spline part of the workpiece is subjected to induction normalization treatment and the whole workpiece is treated by adopting a surface induction quenching manner after the whole workpiece is machined, so that the effective depth of a hardened layer is controlled to 0.25r to 0.55r; and finally, the tempering is carried out for 2h at 200 DEG C within 4h to obtain the non-quenched-tempered half axle. The non-quenched-tempered half axle provided by the invention has relatively good structure uniformity and a relatively high mechanical property.

Description

technical field [0001] The invention relates to a forging and its manufacturing method, in particular to a non-quenched and tempered half shaft and its manufacturing method. Background technique [0002] In recent years, the automobile industry has developed towards lightweight, high performance, low emission and low cost. The axle shaft, which transmits torque, is an important safety component of an automobile, and requires high strength, toughness and fatigue resistance. At present, most automobile half shafts are made of quenched and tempered steel. The tedious processes of quenching and tempering and straightening lead to high production cost and high energy consumption, which aggravates environmental pollution, and there are quality problems such as quenching deformation and cracking, which are closely related to the development of the automobile industry. The energy saving and emission reduction in the report do not match. Non-quenched and tempered steel is widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D9/28C21D1/28C21D1/18C21D1/10
CPCB23P15/00B23P2700/50C21D1/10C21D1/18C21D1/28C21D9/28C21D2211/005C21D2211/008C21D2211/009C21D2221/01Y02P10/25
Inventor 赵秀明李慎刘磊王占花周蕾毛向阳王章忠王安祥陈鸿键邓文杰
Owner NANJING INST OF TECH