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Wind-powered main shaft forging method

A wind power spindle and flange technology, applied in the field of forging production, can solve problems such as low forging precision, complicated process, and low efficiency, and achieve the effects of improving forging quality, improving work efficiency, and reducing forging procedures

Active Publication Date: 2014-07-23
JIANGSU LINGFEI FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a forging method for wind power main shaft, which overcomes the problems of complicated process, high energy consumption, low efficiency, and low forging precision in the traditional forging method, and is conducive to the development trend of energy saving and emission reduction in the future

Method used

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Effect test

Embodiment 1

[0031] The forging process of 1.5MW wind power main shaft includes steps:

[0032] a. The steel ingots selected must be raw materials smelted by electric furnace smelting + LF (external refining) + VD (vacuum degassing) smelting process. The selected material is 34CrNiMo6, which conforms to DIN EN 10083-3, guarantees S≦0.15%, P≦0.20%, among which [H]≦2.0ppm; [O]≦25ppm. For the raw material steel ingots, the steelmaking plant carries out the hot delivery of hot steel ingots in accordance with the "Steel Ingot Hot Transportation Regulations".

[0033] b, according to figure 2 , The hot steel ingots with a surface temperature greater than 400°C delivered by a steelmaking plant are heated by heating at a furnace temperature of 700°C~750°C for more than 3 hours, and then heating up to 1240 at the maximum power of the heating furnace ±10°C, keep warm for more than 10 hours;

[0034] c, according to Figure 4 , The first pre-forged billet. Take out the steel ingot from the furnace, use ...

Embodiment 2

[0042] The forging method of 2MW wind power main shaft includes steps:

[0043] a. The steel ingots selected must be raw materials smelted by electric furnace smelting + LF (external refining) + VD (vacuum degassing) smelting process. The selected material is 42CrMo4, according to the requirements of standard SEW550-1976, 0.40%≤C≤0.45%, Si≤0.40%, 0.60%≤Mn≤0.80%, S≤0.15%, P≤0.20%, 1.00%≤Cr≤1.20 %, 0.45%≤Ni≤0.60%, 0.18%≤Mo≤0.30%, where [H]≤2.0ppm; [O]≤25ppm.

[0044] b, according to figure 1 For cold steel ingots, the cold steel ingot heating process will be used: the steel ingots with a surface temperature of less than 400°C are loaded into a hot furnace with a maximum furnace temperature of less than 400°C, kept at the furnace temperature for more than 4 hours, and then heated to 850±10°C, the temperature increase per hour is less than 60°C, keep it for more than 6 hours, and then increase to 1240±10°C according to the maximum power of the heating furnace, and keep it for more tha...

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Abstract

The invention relates to a wind-powered main shaft forging method. The wind-powered main shaft forging method comprises the following steps of inspecting a material; heating the material; taking out a blank which is formed by annealing the material for the first time, pre-forging, upsetting, drawing and printing the blank, performing pre-forging to form the blank, and blanking; finally forging the blank to form a main shaft by annealing for the second time, forging a flange end on a hollow rotary worktable, and drawing the main shaft until a shaft body has forging size; performing re-crystallization normalized tempering thermal treatment by using a one-time thermal loading furnace after forging the wind-powered main shaft; roughly turning the wind-powered main shaft and detecting flaws through ultrasonic wave; hardening and tempering the wind-powered main shaft, and performing nondestructive inspection and physical and chemical inspection on the wind-powered main shaft; finely turning the wind-powered main shaft; and packaging the wind-powered main shaft. The wind-powered main shaft forging method provided by the invention has the characteristics that the efficiency is high, the energy is saved, the cost is reduced, and the forging quality is improved.

Description

Technical field [0001] The invention relates to a forging method for a wind power main shaft, belonging to the technical field of forging production. Background technique [0002] At present, with the rapid development and maturity of the wind power industry in my country, the forging output of wind power spindles has been greatly improved in China. Nowadays, the manufacturing development trend of large-scale MW wind power spindles is toward large-scale development. Its forgings are heavier and heavier, and the quality requirements for forgings are getting higher and higher. The design, manufacturing and forging production methods of wind power spindles are proposed higher Claim. [0003] The mainstream wind power spindle forging method still uses the traditional forging process and post-forging heat treatment process. There are many shortcomings in the use of this forging method: using traditional forging methods, the number of heating times increases, resulting in increased fir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/08B21K1/06C21D1/18C21D1/28C21D9/00
Inventor 钱飞杨晓明殷勇锋
Owner JIANGSU LINGFEI FORGING
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