Variable pitch/yaw bearing ring raceway laser phase change hardening method and machining device

Abstract

The invention relates to the technical field of laser machining application, in particular to a variable pitch / yaw bearing ring raceway laser phase change hardening method and a machining device. A cantilever beam and a ball screw on a supporting frame are controlled to adjust the needed machining position, a focusing device is adjusted through a digital controller to shoot lasers to a third refractor, and a third servo motor is used for controlling the third refractor to rotate so that machining from the top of a raceway to the bottom can be achieved; the lasers are constantly perpendicular to the machining position under the refraction action of the refractor; the digital controller controls the horizontal rotation speed of a rotation platform, and machining of the surfaces of differentsizes and different types of bearing ring raceways with the diameter being 2 or more meters can be achieved; stable dislocated and refined grains can be formed on the surface layer and the sub-surfacelayer of the bearing ring raceway through self-cooling of a workpiece; and meanwhile, the maximum hardened layer depth of the bearing ring raceway is improved, the contact strength and anti-fatigue performance of the bearing ring raceway are effectively improved, and abrasion resistance and corrosion resistance of the bearing workpiece are improved.

Description

technical field [0001] The invention relates to the technical field of laser processing applications, in particular to a laser phase transformation hardening method and processing device for pitch / yaw bearing ring raceways, and is suitable for heat treatment of raceway surfaces of large bearings. technical background [0002] The working environment of wind turbines is relatively harsh, so the requirements for anti-vibration and anti-fatigue are relatively high. In order to improve the service life of the bearing, it is necessary to heat-treat the surface of the raceway of the bearing ring during the processing to improve its corrosion resistance. Anti-vibration and other performance, the pitch / yaw bearing ring is generally made of 42CrMo, and other materials with equivalent or better performance can also be used. The surface quenching hardness of the ring raceway should not be lower than 55HRC, and the depth of the hardened layer on the raceway surface Should be ≥ 3mm. [...

AI Technical Summary

Problems solved by technology

However, due to the unstable temperature in the processing process, the workpiece in the induction hardening stage often has soft bands due to incomplete quenching. The size of the pitch / yaw bearing ring is generally more than two meters, and it is difficult to process some parts, and The wall of the ferrule is thin, and the workpiece will be thermally deformed due to high temperature during the heat treatment process. Therefore, the workpiece generally needs to be finished after tempering. Cracks may also occur during the tempering process and lead to scrapping

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