Method for machining large inner gear ring of wind turbine gear box

Abstract

The invention discloses a method for machining a large inner gear ring of a wind turbine gear box. The method includes the steps that 1, an inner gear ring blank is formed in a forging forming mode according to the specification and forging standard of the inner gear ring; 2, outer circle rough machining, inner hole rough machining and end face rough machining are conducted on the inner gear ring blank, the outer circle, an inner hole and an end face are primarily formed, and allowance is reserved; 3, rough machining is conducted on the inner gear ring obtained after outer circle rough machining, inner hole rough machining and end face rough machining are conducted to enable the inner gear ring to be in a tooth shape; 4, quenching and tempering are conducted on the tooth-shaped inner gear ring obtained after rough machining is conducted; 5, the profile and the inner hole of the inner gear ring obtained after quenching and tempering are machined through finish machining; 6, nitrogen treatment is conducted on the inner gear ring obtained after finishing machining is conducted. By means of the method for machining the large inner gear ring of the wind turbine gear box, quenching and tempering are conducted on the inner gear ring which is machined to be in the tooth shape through rough machining, the quenching and tempering effects on the tooth top, the tooth root and the tooth surface are the same, the uneven quenching and tempering effect caused by the limited quenching and tempering hardenability is avoided, and the comprehensive mechanical performance of the interior of the inner gear ring is improved; meanwhile, working allowance of follow-up finishing machining is lowered, and machining deformation is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power, and more specifically, relates to a processing method for a large internal ring gear of a wind power gearbox. Background technique [0002] Gearboxes are widely used in wind turbines and are important mechanical components. The main function of the gearbox is to transmit the power generated by the wind wheel under the action of the wind to the generator and make it obtain a corresponding speed. Since the speed of the wind wheel is usually very low, far below the speed required by the generator to generate electricity, it must be realized through the speed-up effect of the gear pair of the gearbox. [0003] According to statistics, most of the failures of wind power gearboxes are caused by planetary stages, and the reliability of the inner ring gear often becomes the weak link of wind power gearboxes. As the unit capacity of the fan increases, the modulus and diameter of the inner ring gear a...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a large-scale internal ring gear processing method for wind power gearboxes, which can effectively solve the problems of poor comprehensive mechanical properties and low reliability of the internal ring gear. The problem of short product life

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