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Waste heat hardening and tempering process of motorcycle crank forged piece

A technology for forging waste heat and motorcycles, which is applied in the direction of manufacturing tools, heat treatment equipment, and other manufacturing equipment/tools. It can solve the problems of difficult control of workpiece quenching cracking, coarse grains, and unstable product quality. Quenching cracking phenomenon, uniform temperature, excellent quality effect

Inactive Publication Date: 2009-09-09
重庆歇马机械曲轴有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easily affected by unstable factors such as man-made, light, etc., the product quality is extremely unstable, the quenching and cracking of the workpiece is difficult to control, and the scrap rate is high.
Or use constant temperature heating equipment, only use part of the waste heat at about 600 ℃, reheat austenitization, quench, and then temper at high temperature. This method eliminates the grain dislocation phenomenon caused by forging deformation, and cannot completely solve the coarse grain problem, the energy-saving effect is not obvious, and the basic meaning of waste heat conditioning is lost

Method used

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  • Waste heat hardening and tempering process of motorcycle crank forged piece
  • Waste heat hardening and tempering process of motorcycle crank forged piece
  • Waste heat hardening and tempering process of motorcycle crank forged piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, the waste heat quenching and tempering process of motorcycle C100 type crank forging comprises the following steps:

[0031] a. Put the 45# round steel bars into a 250KW intermediate frequency furnace, heat the intermediate frequency to 1050°C, and use an infrared thermometer to control the temperature;

[0032] b. At 950°C, a 150T air hammer is used to draw out the heated bar to produce a crank blank;

[0033] c. Carry out rough die forging on the crank blank through a 630T friction press, and control the temperature at 920°C to form the handle and rod of the crank;

[0034] d. Precise die forging is carried out with a 300T friction press at 880°C to remove the oxide layer on the surface of the crank, so that the specific size of the crank matches the design size;

[0035] e. Put the crank into the mesh belt constant temperature furnace, and treat it at a constant temperature of 850°C for 220 seconds, so that the temperature on the surface of the crank i...

Embodiment 2

[0038] Embodiment 2, the waste heat quenching and tempering process of motorcycle C125 type crank forging comprises the following steps:

[0039] a. Put the 40Cr round steel bar into a 250KW intermediate frequency furnace, heat it to 1150°C with intermediate frequency, and use an infrared thermometer to control the temperature;

[0040] b. At 1000°C, a 150T air hammer is used to draw out the heated bar to produce a crank blank;

[0041] c. Carry out rough die forging on the crank blank through a 630T friction press, and control the temperature at 935°C to form the handle and rod of the crank;

[0042] d. Precise die forging is carried out with a 300T friction press at 900°C to remove the oxide layer on the surface of the crank, so that the specific size of the crank matches the design size;

[0043] e. Put the crank into the constant temperature mesh belt furnace, and treat it at a constant temperature of 855°C for 240 seconds, so that the temperature of the crank surface is ...

Embodiment 3

[0046] Embodiment 3, the waste heat quenching and tempering process of motorcycle C250 type crank forging comprises the following steps:

[0047] a. Put the 40Cr round steel bar into a 250KW intermediate frequency furnace, heat it to 1200°C with intermediate frequency, and use an infrared thermometer to control the temperature;

[0048] b. At 1100°C, a 150T air hammer is used to draw out the heated bar to produce a crank blank;

[0049] c. Carry out rough die forging on the crank blank through a 630T friction press, and control the temperature at 950°C to form the handle and rod of the crank;

[0050] d. Precise die forging is carried out with a 300T friction press at 920°C to remove the oxide layer on the surface of the crank, so that the specific size of the crank matches the design size;

[0051] e. Put the crank into the constant temperature mesh belt furnace, and treat it at 860°C for 260 seconds, so that the temperature on the surface of the crank is basically the same ...

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PUM

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Abstract

The invention discloses a waste heat hardening and tempering process of motorcycle crank forged piece, comprising the working procedures like medium-frequency heating, extracting billet, blocking, precise forging, isothermal processing, quenching, tempering and the like. The process can obviously improve hardenability through forging waste heat hardening and tempering, ensure even distribution of tissues and hardness and ensure that the forged piece has the mechanical performance superior to that of the workpieces after conventional hardening and tempering. The workpieces undergoing finish forging adopt short isothermal processing to ensure the temperature of the workpieces to be uniform when entering quenching liquid, thus ensuring stable performance and excellent quality and realizing industrial production. Meanwhile, the short isothermal processing only consumes little electric energy, thus conforming to the requirement of the economical society.

Description

technical field [0001] The invention relates to a quenching and tempering treatment method for motorcycle parts, in particular to a waste heat quenching and tempering process for motorcycle crank forgings. Background technique [0002] The world's industrially developed countries began to study the production process of forging waste heat quenching and tempering since the 1960s. Because of its remarkable energy-saving effect, improving the mechanical properties of the product, reducing the process links, and shortening the production cycle, it has attracted the attention of scientific research units and heat treatment industries in various countries. It has been widely used in the 1980s. The forging of JB4202-86 steel in my country Waste heat quenching and tempering treatment and the revised version of JB4202-1999 are the most powerful proof. With the development of my country's equipment, power, machine parts and other machinery industries, the application of waste heat que...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04C21D1/18C21D1/60
Inventor 曹正素韩家学
Owner 重庆歇马机械曲轴有限公司
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