Forge welding method for manufacturing wind power main shaft

Abstract

The invention relates to a forge welding method for manufacturing a wind power main shaft, wherein the wind power main shaft is manufactured by using the following processes in turn: forge welding structure design, parts forge and press, mechanical processing, deep penetration welding, quality detection, heat treatment and finished product detection, wherein the process of forge welding structure design is for confirming the split structure of the wind power main shaft; the process of parts forge and press is for forging the split structured parts; the process of mechanical processing is for milling a to-be-welded surface; the process of deep penetration welding is for performing the deep penetration welding by using high-energy electronic beams; the process of quality detection is for detecting the melted depth and quality of welding gaps; the process of heat treatment is for eliminating the stress after welding; and the process of finished product detection is for detecting the whole property of a blank. By using the wind power main shaft which is manufactured by using the forge welding method, the phenomenon of increasing the demand on the tonnage of forged and pressed equipment caused by the increasing of the weight of the wind power main shaft can be avoided. By utilizing the heat treatment for eliminating the stress after welding, the wind power main shaft can bear the repeated loading impact under poor working conditions, is suitable for bearing the violent-typhoon huge impact load in the coastal or offshore area, and is beneficial to increasing the running stability and safety of a wind turbine.

Description

technical field [0001] The invention relates to a manufacturing method of a main shaft of a wind power generator, in particular to a forging welding manufacturing method of a main shaft of a wind power generator. Background technique [0002] The wind turbine main shaft is a key part of the wind power machine. The existing wind power main shaft generally adopts the integral forging manufacturing method, which is beneficial to ensure the physical and chemical properties and organizational structure uniformity of the wind power main shaft material, and is suitable for harsh working environments. Operates under heavy alternating loads. When the generating power of the wind turbine is small, the weight of the wind power main shaft is also small, and the overall forging method for manufacturing the wind power main shaft does not require high forging equipment tonnage. However, as the power of wind power generation increases, the weight of the wind power main shaft also increases...

AI Technical Summary

Problems solved by technology

However, as the power of wind power generation increases, the weight of the wind power main shaft also increases rapidly. If the overall forging method is still used to manufacture the wind power main shaft, the tonnage requirements of the forging equipment are getting higher and higher, so that it cannot be implemented; especially if the large wind power main shaft is used. The overall casting method is not suitable for working under alternating load conditions due to the low structure density of the spindle and poor physical and chemical properties of the material.

If tungsten argon arc welding, metal argon arc welding, plasma welding, laser welding and other methods are used to weld split large-wall thickness forgings, it is necessary to open a large groove and fill a large amount of metal, and the performance of the filler metal is much lower than that of The performance of forgings is easy to cause a large difference between the performance of the weld area and the forging body, and a large amount of heat input during the welding process produces large residual stress and welding deformation. Design requirements

So far, there is no manufacturing method for wind power spindles that can replace integral forging or achieve the effect of integral forging

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