Method for correcting quenching deformation out-of-tolerance of bearing ring of wind driven generator

Abstract

The invention relates to a method for correcting the quenching deformation out-of-tolerance of a bearing ring rollaway nest of a wind driven generator. The method comprises the following steps: measuring a bearing ring to find out an ellipse major axis direction of ring deformation; applying pressure to an extension part of the ring deformation, namely the ellipse major axis direction by adoptinga pressing plate; applying the pressure towards both ends of the ellipse major axis direction so as to correct the deformation; putting both the ring and a clamp in a tempering furnace for tempering at medium-and-low temperature for 4-8 hours with a low tempering temperature of 160-200 DEG C so as to finalize the shape and eliminate the stress. The has simple method and simple equipment device andcan semi-quantitatively and quantitatively finish the correction of the deformation out-of-tolerance of the bearing ring. The method mainly corrects the out-of-tolerance of ovality and guarantees that subsequent processing has no influence on the depth of a quenching layer.

Description

technical field [0001] The invention relates to a method for correcting out-of-tolerance quenching deformation of bearing rings of wind power generators, in particular to a heat-setting correction method for out-of-tolerance quenching deformation of bearing rings with double raceways. Background technique [0002] The pitch bearings used in wind turbines of around 1.5MW and above are assembled from inner and outer rings, plus steel balls and spacers. The diameter of the inner and outer rings of the pitch bearing is about two meters, and the distance between the two raceways of the inner and outer rings (steel balls are installed in the raceways) is only more than ten millimeters. The surface of each ring (concave The quenching quality of the arc shape is the guarantee of the working life of the pitch bearing. The wind turbine pitch bearing is a four-point contact structure with double raceways. The surfaces of the two raceways of the inner and outer rings need to be quenche...

AI Technical Summary

Problems solved by technology

However, the deformation of the bearing ring is likely to be out of tolerance after quenching. Since the ratio of the wall thickness of the outer ring of the pitch bearing to the length of the circumference is about 1:70, after quenching, due to the combined effect of structural stress and thermal stress, there is Part of the ferrule will produce out-of-tolerance deformation (>0.2 / 1000mm), that is, out-of-tolerance ovality, which not only increases the amount of subsequent grinding, but also cannot ensure the depth of the quenched layer after grinding, affecting product quality