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A non-quenched and tempered brake camshaft and its manufacturing method

A manufacturing method and camshaft technology, which are applied in the field of forgings and their manufacturing, can solve the problems of large energy consumption, inconsistent energy conservation and emission reduction, aggravated environmental pollution, etc., so as to simplify the production process, save the quenching and tempering treatment, and reduce environmental pollution. Effect

Active Publication Date: 2019-04-26
NANJING INST OF TECH +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

[0012] A method for manufacturing a non-quenched and tempered brake camshaft, comprising: blanking → induction heating → pre-forging → final forging → trimming → straightening → controlled cooling → machining → 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 the straightening is completed, enter the controlled cooling process. Dispersed and hung the workpieces on the cooling line moving forward at a certain speed, and cooled by rotating air. By coordinating the air volume of the blower, the external environment temperature, etc., with the help of an infrared thermometer, ensure t...

Embodiment 2

[0014] A method for manufacturing a non-quenched and tempered brake camshaft, comprising: blanking → induction heating → pre-forging → final forging → trimming → straightening → controlled cooling → machining → surface induction hardening and tempering. The F45MnVS bar is 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; 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 the straightening is completed, enter the controlled cooling process. Dispersed and hung the workpieces on the cooling line moving forward at a certain speed, and cooled by rotating air. By coordinating the air volume of the blower, the external ambient temperature, etc., with the help of an infrared thermometer, e...

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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 machining; and carrying out 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 suspended on a cooling line, which moves forward at a certain speed, in a dispersed manner and the cam part is subjected to air-blowing cooling so that the cam part is cooled to 500 DEG C to 600 DEG C at a cooling speed of about 2.5 DEG C / s to 5 DEG C / s; and then the cam part is put into a work bin to be intensively cooled and is slowly cooled to a room temperature at a cooling speed less than 1.8 DEG C / s. After the machining is carried out, the whole workpiece is treated by adopting a surface induction quenching manner to control the effective depth of a hardened layer to 0.25r to 0.3r; 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 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 development of energy conservati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00F16H53/00
CPCB23P15/00F16H53/00
Inventor 赵秀明刘磊李慎王占花周蕾毛向阳王章忠徐旗钊陈亮徐剑峰
Owner NANJING INST OF TECH
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