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Non-quenched-tempered brake camshaft and manufacturing method thereof

A manufacturing method and camshaft technology, applied to cams, manufacturing tools, brake actuators, etc., can solve the problems of inconsistent energy saving and emission reduction, aggravated environmental pollution, and high production costs, so as to save energy, reduce environmental pollution, and improve The effect of toughness

Active Publication Date: 2017-12-15
JIANGSU HENGLI BRAKE MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, brake camshafts are mostly made of quenched and tempered steel. The tedious processes of quenching and tempering and straightening lead to high production costs, high energy consumption, aggravated environmental pollution, and quality problems such as quenching deformation and cracking. The development of energy saving and emission reduction does not match

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 brake camshaft, comprising: blanking → induction heating → pre-forging → final forging → trimming → straightening → controlled cooling → induction normalizing → machining → partial surface induction hardening and tempering . F45MnVS bar stock is used, firstly heated to 1250°C by induction; the cam part of the workpiece is partially forged through pre-forging and final forging processes, and the final forging temperature is 1050°C; trimming and straightening are carried out after forging, and the workpiece is trimmed The temperature 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. Carry out 950°C induction normalization on the cam part of the workpiece. After machining, the cam and the journal of the workpiece are local...

Embodiment 2

[0015] A method for manufacturing a non-quenched and tempered brake camshaft, comprising: blanking → induction heating → pre-forging → final forging → trimming → straightening → controlled cooling → induction normalizing → machining → partial surface induction hardening and tempering . F45MnVS bar stock is used, firstly heated to 950°C by induction; the cam part of the workpiece is 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; after forging, edge trimming and calibration Straight, 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℃ induction normalization on the cam part of the workpiece. After machining, the cam and ...

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Abstract

The invention relates to a non-quenched-tempered brake camshaft 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 partial surface induction quenching and tempering. An F45MnVS bar material with the size of phi25 to phi60 is adopted and a cam part of a workpiece is partially forged through a forging procedure; after a straightening procedure is carried out, 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; and then the cam part of the workpiece is subjected to induction normalization treatment. After the machining is carried out, partial strengthening treatment is carried out on the workpiece by adopting a surface medium-frequency induction quenching manner to control the effective depth of a hardened layer to 1.5mm to 5mm; and finally, the tempering is carried out for 2h at 200 DEG C within 4h to obtain the camshaft. The camshaft 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 brake camshaft and its manufacturing method. Background technique [0002] In recent years, the automobile industry has developed towards lightweight, high performance, low emission and low cost. Non-quenched and tempered steel is widely used in automobile forgings due to its energy saving, emission reduction, low cost and superior performance. The brake camshaft is one of the main accessories in the drum brake system, and it must bear a certain torque. The driving brake shoe brake requires the camshaft to have good mechanical properties. At present, brake camshafts are mostly made of quenched and tempered steel. The tedious processes of quenching and tempering and straightening lead to high production costs, high energy consumption, aggravated environmental pollution, and quality problems such as quenching deformation and cracking. The develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/30C21D1/42C21D1/28C21D1/10F16H53/02F16D65/16
CPCC21D1/10C21D1/28C21D1/42C21D9/30C21D2211/005C21D2211/008C21D2211/009F16D65/16F16H53/025Y02P10/25
Inventor 赵秀明徐旗钊陈亮李慎刘磊王占花毛向阳王章忠徐剑峰
Owner JIANGSU HENGLI BRAKE MFG
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