Production method of 18CrNiMo7-6 forging for wind power equipment gear

A technology for wind power equipment and production methods, which is applied to the field of 18CrNiMo7-6 forgings for wind power equipment gears, and can solve problems such as workpiece cracking, narrow transition temperature range, and long transition time

Inactive Publication Date: 2020-09-08
ZHANGJIAGANG HAIGUO HEAVY FORGING
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  • Abstract
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Problems solved by technology

However, the 18CrNiMo7-6 material has the following defects: 18CrNiMo7-6 is a bainite steel, according to its CCT curve, the F+P transformation temperature range is narrow, and the transformation time is long, and the structure obtained by the isothermal normalizing process is B or B+ F+P mixed structure, and 18CrNiMo7-6 is also a white spot sensitive steel, which will greatly reduce the mechanical properties of the steel under the traditional forging process, resulting in cracking of the workpiece

Method used

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  • Production method of 18CrNiMo7-6 forging for wind power equipment gear
  • Production method of 18CrNiMo7-6 forging for wind power equipment gear

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Embodiment Construction

[0016] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0017] The production method of 18CrNiMo7-6 forgings for wind power equipment gears, the steps are as follows: blanking→forging→normalizing→tempering→rough turning→UT flaw detection→finish turning;

[0018] 1) Cutting: Take 18CrNiMo7-6 steel as raw material ingot, its chemical composition requirements are as follows: C: 0.15-0.21%, Si: 0.17-0.35%, Mn: 0.50-0.90%, P: ≤0.020%, S: ≤0.015%, Cr:1.50~1.80%, Ni:1.40~1.70%, Mo:0.25~0.35%, Cu:≤0.20%, Al:0.02~0.05%, Nb:≤0.05%, V:≤0.15%, Ti: ≤0.01%, N: 0.007~0.018%, Ca: ≤10ppm, Sn: ≤100ppm, Pb: ≤100ppm, Bi: ≤100ppm, Sb: ≤30ppm, As: ≤150ppm, H: ≤1.8ppm, O : ≤18ppm, Al / N: 3 / 5, As+Sn+Pb+Sb+Bi: ≤0.035%, the balance is Fe; the smelting method of electric furnace + ladle refining + vacuum refining is adopted when the ingot is unloaded, during the smelting process The protective pouring method is used to protect ...

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Abstract

The invention discloses a production method of a 18CrNiMo7-6 forging for a wind power equipment gear. The production method includes the following steps of feeding, forging, normalizing, tempering, rough turning, UT flaw detecting and finish turning. In feeding, 18CrNiMo7-6 steel is taken and used as a raw materials steel ingot; in forging, a forging is formed after three times of upsetting and drawing, the sum of the forging ratios of three times of upsetting and drawing is larger than 7:1, the initial forging temperature is 1,220 DEG C, and the final forging temperature is 850 DEG C; in normalizing, the forging is heated to 710+ / -5 DEG C and heat-preserved for 2-2.5 h, then the forging is heated to 960+ / -5 DEG C at the heating rate being smaller than or equal to 150 DEG C / h and heat-preserved for 6-6.5 h, and then the forging is air-cooled below 300 DEG C; in tempering, the forging is heated to 680 DEG C at the heating rate being smaller than or equal to 150 DEG C / h and kept for 10-12 h, and then the forging is air-cooled to room temperature; and in finish turning, the forging is finish-turned into the wind power equipment gear meeting the dimension requirements.

Description

technical field [0001] The invention relates to a production method of 18CrNiMo7-6 forgings for wind power equipment gears. Background technique [0002] With the rapid development of wind power industry, reducer industry and high-speed rail industry, in order to ensure the high efficiency and safe operation of wind power gear products, 18CrNiMo7-6 materials with high bending strength, contact fatigue strength, high hardness and wear resistance are used As a leading application material for key parts of gears or gear shafts. However, the 18CrNiMo7-6 material has the following defects: 18CrNiMo7-6 is a bainite steel, according to its CCT curve, the F+P transformation temperature range is narrow, and the transformation time is long, and the structure obtained by the isothermal normalizing process is B or B+ F+P mixed structure, and 18CrNiMo7-6 is also a white spot sensitive steel, which will greatly reduce the mechanical properties of the steel and cause the workpiece to crac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C22C38/42C22C38/48C22C38/46C22C38/50C21D8/00C21D1/28C21D1/18B23P15/14
CPCB23P15/14C21D1/18C21D1/28C21D8/005C22C38/001C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 盛雪华蒋伟姚强
Owner ZHANGJIAGANG HAIGUO HEAVY FORGING
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