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Manufacturing process for yaw gear ring for wind generating set

A technology for wind turbines and manufacturing processes, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., and can solve problems such as the inability to manufacture high-precision yaw ring gears

Inactive Publication Date: 2018-03-20
ZHANGJIAGANG HAILU ANNULAR FORGINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing manufacturing process cannot produce high-precision and high-quality yaw ring gears

Method used

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Experimental program
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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with specific embodiments.

[0017] The manufacturing process of the yaw ring gear used in wind turbines, the process steps are as follows: raw material smelting→cutting→heating before forging→blank making→ring rolling→normalizing→rough turning→quenching and tempering→semi-finishing→stress relief treatment→ Gear milling → tooth surface quenching and tempering → finishing turning → anti-corrosion of non-working surface → surface protection of working surface;

[0018] (1) Raw material smelting: 42CrMo4 steel is used as raw material, and its chemical composition requirements are as follows: C: 0.41-0.45%, Si: 0.20-0.30%, Mn: 0.70-0.90%, P: ≤0.015%, S: ≤0.010 %, Cr: 1.05~1.20%, Ni: 0.10~0.20%, Mo: 0.20~0.25%, Cu: ≤0.30%, Al: 0.015~0.035%, V: ≤0.02%, Ti: ≤0.005%, Ca: ≤0.0015%, N: 60~110ppm, H: ≤2.0ppm, O: ≤20ppm; raw materials are smelted by electric furnace, ladle refined or electroslag remelte...

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PUM

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Abstract

The invention discloses a manufacturing process for a yaw gear ring for a wind generating set. The manufacturing process comprises the steps of raw material smelting, blanking, heating before forging,blank making, ring rolling, normalizing, rough turning, thermal refining, semi-finish turning, distressing treatment, gear milling, gear surface hardening and tempering, finish turning, non-working surface corrosion preventing and working face surface protection. The yaw gear ring manufactured through the manufacturing process can meet the following technical requirements: the strength of extension Rm (MPa) is 750-900, the yield strength Rp 0.2 (MPa) is larger than or equal to 500, the ductility A (%) is larger than or equal to 14, the percentage reduction of area Z (%) is larger than or equal to 55, the hardness HB is 228-270, and the ballistic work (J) is larger than or equal to 35. Nonmetallic inclusion of a forge piece meets the following requirements that A: the thick series is smaller than or equal to 1.0, and the thin series is smaller than or equal to 1.5; B: the thick series is smaller than or equal to 1.0, and the thin series is smaller than or equal to 1.5; C, the thick series is smaller than or equal to 1.0, and the thin series is smaller than or equal to 1.0; D: the thick series is smaller than or equal to 1.0, and the thin series is smaller than or equal to 1.5; andDS is smaller than or equal to 1.5. The macrostructure flaw level of the forge piece meets the following requirements: the general porosity is smaller than or equal to second level, the center porosity is smaller than or equal to second level, and segregation is smaller than or equal to second level.

Description

technical field [0001] The invention relates to the field of forging of wind power equipment parts, in particular to a manufacturing process of a yaw ring gear for a wind power generating set. Background technique [0002] The yaw ring gear is a key component in the yaw system of wind power equipment, and its function is equivalent to a large sliding bearing. It is located at the bottom of the nacelle seat, the lower end is connected to the tower by bolts, the upper part supports the entire nacelle mechanism through the sliding surface, and the surroundings are geared with the output gears of four yaw reducers. Driven by the yaw motor, the overall nacelle mechanism is driven slowly. Rotate to achieve the purpose of adjusting the direction of the wind turbine impeller. The design life of the yaw ring gear is generally 20 years. Because of its special installation location, it is difficult to maintain during use and the cost of replacement is high. Therefore, there are high r...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C38/46C21D1/28C21D1/18C21D9/40B23P15/00
CPCC22C38/02B23P15/00C21D1/18C21D1/28C21D9/40C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46
Inventor 万明珍张斌宋亚东朱乾皓戴玉同范禹
Owner ZHANGJIAGANG HAILU ANNULAR FORGINGS
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