Forging process for ledeburite steel shaft

A technology of ledeburite steel and ledeburite, which is applied in the field of ledeburite steel shaft processing, can solve problems such as carbide segregation, influence on performance, and grain growth, and achieve small carbide segregation, good performance, Good product quality

Active Publication Date: 2016-09-14
ANHUI RUIJIE FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ledeburite steel produced by the ordinary forging process is prone to serious carbide segregation and extremely uneven distribution; cracks are prone to occur during the forging process; the grains re-grow and the carbides gather, which affects the performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A forging process for a ledeburite steel shaft, the process is composed of the following steps:

[0013] (1) Select a blank, and rough process the blank to obtain a shaft blank;

[0014] (2) Put the shaft blank into a heating furnace for preheating, the preheating temperature is 250°C, and then keep warm, the holding temperature is 250°C, and the holding time is 1.7 hours;

[0015] (3) Put the preheated shaft into the furnace for a heating, the heating temperature is 1150°C, and then keep it warm for 1250°C, and the holding time is 5 hours. body, the entire alloy is composed of austenite and ledeburite precipitated first, and then the shaft is upset. It cannot be bent during upsetting. If there is bending, it must be returned to the furnace to correct and re-upset;

[0016] (4) Carry out secondary heating on the shaft after upsetting, the secondary heating temperature is 710°C, and then carry out secondary heat preservation, the secondary heat preservation temperature ...

Embodiment 2

[0020] A forging process for a ledeburite steel shaft, the process is composed of the following steps:

[0021] (1) Select a blank, and rough process the blank to obtain a shaft blank;

[0022] (2) Put the shaft blank into a heating furnace for preheating, the preheating temperature is 260°C, and then keep warm, the holding temperature is 260°C, and the holding time is 1.9 hours;

[0023] (3) Put the preheated shaft into the furnace for one heating, the heating temperature is 1170°C, and then keep it warm for 5.3 hours at a temperature of 1170°C, and the liquid alloy undergoes eutectic transformation to form Layleigh body, the entire alloy is composed of austenite and ledeburite precipitated first, and then the shaft is upset. It cannot be bent during upsetting. If there is bending, it must be returned to the furnace to correct and re-upset;

[0024] (4) Carry out secondary heating on the shaft after upsetting, the secondary heating temperature is 720°C, and then carry out se...

Embodiment 3

[0028] A forging process for a ledeburite steel shaft, the process is composed of the following steps:

[0029] (1) Select a blank, and rough process the blank to obtain a shaft blank;

[0030] (2) Put the shaft blank into a heating furnace for preheating, the preheating temperature is 270°C, and then keep it warm, the holding temperature is 270°C, and the holding time is 2 hours;

[0031] (3) Put the preheated shaft into the furnace for one heating, the heating temperature is 1190°C, and then keep it warm for 1190°C, and the holding time is 5.5 hours, and the liquid alloy undergoes eutectic transformation to form Leyer body, the entire alloy is composed of austenite and ledeburite precipitated first, and then the shaft is upset. It cannot be bent during upsetting. If there is bending, it must be returned to the furnace to correct and re-upset;

[0032] (4) Carry out secondary heating to the shaft after upsetting, the secondary heating temperature is 730°C, and then carry out...

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PUM

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Abstract

The invention belongs to the technical filed of ledeburite steel shaft machining and relates to a forging process for a ledeburite steel shaft. The process includes the following steps that firstly, a blank is selected and rough-machined, and a shaft blank is obtained; secondly, the shaft blank is put into a heating furnace to be preheated and subjected to heat preservation; thirdly, the preheated shaft is put into the furnace to be subjected to primary heating, then subjected to primary heat preservation and then subjected to upsetting; fourthly, the upset shaft is subjected to secondary heating and then the subjected to secondary heat preservation, then the shaft is drawn out, and the drawing-out ratio ranges from 5 to 7; and fifthly, the drawn-out shaft is subjected to tertiary heating and then subjected to tertiary heat preservation, the shaft is air-cooled to the room temperature after being discharged from the furnace, and normalizing treatment is conducted. The ledeburite steel shaft manufactured through the forging process is small in carbide segregation and uniform in distribution; no crack is generated, and the quality of the product is good; and grains cannot grow up anew, carbide cannot gather, and use performance is good.

Description

technical field [0001] The invention belongs to the technical field of ledeburite steel shaft processing, and in particular relates to a forging process of a ledeburite steel shaft. Background technique [0002] Ledeburite is one of the basic structures of steel materials, and it is a mixture of pearlite, cementite and eutectic cementite at room temperature. The ledeburite steel produced by the ordinary forging process is prone to serious carbide segregation and extremely uneven distribution; cracks are prone to occur during the forging process; grains re-grow and carbides gather, affecting performance. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a forging process of a ledeburite steel shaft. [0004] In order to solve the above problems, a forging process of a ledeburite steel shaft according to the present invention, the process is composed of the following steps: [0005] (1) Select a blank, and rough pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/06B21J1/06C21D1/28C21D9/28
CPCB21J1/06B21K1/06C21D1/28C21D9/28Y02P10/20
Inventor 吕美莲刘春超冯宝倪吕俊吕诚
Owner ANHUI RUIJIE FORGING
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