Method for forging 17CrNiMo6 steel wind power generation gear

A gear forging and gear technology, which is applied in the forging field of 17CrNiMo6 steel wind power generation gears, can solve the problems of unreasonable forging process parameters, the decline of comprehensive mechanical properties of wind power generation gears, and the reduction of service life of wind power generation gears, so as to eliminate internal organization The effect of stress, improving comprehensive mechanical properties, and inhibiting the formation of crystal nuclei

Inactive Publication Date: 2017-02-22
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this steel has not yet been included in the national standard. Although it has been widely used, many basic properties, especially the forging process, are often compared to common heavy-duty gears and processed by exper

Method used

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  • Method for forging 17CrNiMo6 steel wind power generation gear
  • Method for forging 17CrNiMo6 steel wind power generation gear
  • Method for forging 17CrNiMo6 steel wind power generation gear

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this embodiment, the forging is a 2m×Φ1m cylindrical 17CrNiMo6 steel ingot. The 17CrNiMo6 steel ingot is provided by Taiyuan Heavy Machinery Co., Ltd. The steel is low-carbon high-alloy stainless steel, which has good mechanical properties and strong corrosion resistance. It is an excellent raw material for preparing wind power gears, but unlike ordinary low-carbon high-alloy stainless steel forging process, it is easy to produce feathery or reticular bainite inside the structure during forging, which reduces the comprehensive mechanical properties of wind power gears.

[0024] Such as Figure 1~5 Shown, a kind of 17CrNiMo6 steel wind power generation gear forging method is characterized in that adopting following steps to carry out successively:

[0025] (1) Pre-forging treatment: put the forging blank in the heating furnace, heat the furnace to 1230°C and put the blank into the heating furnace, keep it warm for 4 hours according to the size of the blank, and obtain...

Embodiment 2

[0030] A kind of 17CrNiMo6 steel forging method for wind power generation gear is characterized in that adopting following steps to carry out successively:

[0031] (1) Pre-forging treatment: place the forging blank in a heating furnace, heat the furnace to 1240°C and put the blank into the heating furnace, and keep it warm for 6.5 hours according to the size of the blank;

[0032] (2), forging molding:

[0033] Put the heated blank into a forging mold consisting of a die, a punch, a sleeve and an ejector mechanism. The initial forging temperature is 1240°C, the final forging temperature is 830°C, and the punch and die are pressed. The forging ratio of the single pass of the first fire is 1.73, and the forging ratio of the last pass is 1.87, with 0.5s -1 The deformation rate makes the blank form together along the inner wall of the mold; after holding the pressure for 7s, the punch and die are unloaded and returned, and after the blank is demoulded, the forged gear is ejected...

Embodiment 3

[0037] A kind of 17CrNiMo6 steel forging method for wind power generation gear is characterized in that adopting following steps to carry out successively:

[0038] (1) Pre-forging treatment: place the forging blank in a heating furnace, heat the furnace to 1250°C and put the blank into the heating furnace, and keep it warm for 10 hours according to the size of the blank;

[0039] (2), forging molding:

[0040] Put the heated blank into a forging mold consisting of a die, a punch, a sleeve and an ejector mechanism. The initial forging temperature is 1250°C, the final forging temperature is 840°C, and the punch and die are pressed. The forging ratio is 2 for the single pass of the fire time, and the forging ratio for the last pass is 2, with 1s -1 The deformation rate makes the blank form together along the inner wall of the sleeve mold; after holding the pressure for 10s, the punch and die are unloaded and returned, and after the blank is demoulded, the forged gear is ejected...

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Abstract

The invention belongs to the wind power generation gear manufacturing technology, and relates to a method for forging a 17CrNiMo6 steel wind power generation gear. The method is characterized by comprising the steps of treatment before forging, wherein after the temperature of a heating furnace is raised, a forged piece blank is placed in the heating furnace to be heated and subjected to heat preservation; forging forming, wherein the forging temperature is 1240+/-10 DEG C-830+/-10 DEG C, the single-heating-number single-pass forging ratio ranges from 1.5 to 2, the last-pass forging ratio ranges from 1.8 to 2, the total forging ratio is larger than 4, and a blank gathering material is formed at the deformation rate being 0.1-1 s<-1>; and cooling after forging, wherein the gear is fast cooled to 650+/-10 DEG C after being forged for isothermal tempering, and furnace cooling is carried out after heat preservation to achieve the room temperature. A forged piece is heated before being forged, and the inner structure of the forged piece is more dispersed and uniform; the forging forming process parameters are controlled, and therefore the inner structure of the forged piece can form tiny equiaxial grains quite easily, and the comprehensive mechanical property of the forged piece is improved; and by means of the manner of cooling after forging, energy consumption is reduced, and meanwhile the stress of the inner structure of the forged piece is eliminated.

Description

technical field [0001] The invention belongs to the technical field of wind power generation gear manufacturing, and in particular relates to a forging method of a 17CrNiMo6 steel wind power generation gear. Background technique [0002] The development of human society is at the cost of consuming a large amount of extremely precious non-renewable fossil resources formed on the earth hundreds of millions of years ago. Therefore, in the field of energy, exploring green and clean energy has become the only way. Wind energy is inexhaustible, and wind power generation is pollution-free. The unique advantages make it quickly become the focus of clean energy research and development, and the wind power industry has sprung up like mushrooms. The wind power industry is based on the wind power equipment manufacturing industry. Since wind power equipment often works in inaccessible places such as the Gobi, desert and even the sea, it is subjected to the temperature difference between ...

Claims

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Application Information

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IPC IPC(8): B21K1/30B21J5/02B21J1/06
CPCB21J1/06B21J5/02B21K1/30
Inventor 党淑娥赵禛刘燕刘建生
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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