Method for grinding and positioning inner ring of third-generation wheel hub bearing

Abstract

The invention belongs to the technical field of the processing of the bearing ring and provides a method for grinding and positioning the inner ring of a third-generation wheel hub bearing. An electromagnetic centerless clamping tool is used as a tool for processing the inner ring (2) of the wheel hub bearing, which needs to be processed; the length of the inner cavity of an magnetic pole (1) of the electromagnetic centerless clamping tool is made to be greater than the distance from the end surface A of an step-shaped entity shaft of the inner ring (2) of the bearing to the inner end surface F of a flange plate on one end of the inner ring (2) of the bearing; the step-shaped entity shaft of the inner ring (2) of the bearing is arranged in the inner cavity of the magnetic pole (1), the inner end surface F of the flange plate on one end of the inner ring (2) of the bearing is adsorbed and clung to the end surface of an opening end of the magnetic pole (1), and the inner ring (2) of the bearing is positioned; the inner end surface F of the flange plate on one end of the inner ring (2) of the bearing is used as a processing datum surface; and the external diameter and the end surface of the inner ring (2) of the bearing are processed. The method for grinding and positioning the inner ring of the third-generation wheel hub bearing has small processing errors due to the short distance between the processed part and the magnetic pole and ensures the higher processing precision of the external diameter and the other end surface of the inner ring of the bearing.

Description

technical field [0001] The invention belongs to the technical field of bearing ring processing, and mainly relates to a grinding and positioning method for the inner shaft ring of a third-generation hub bearing. Background technique [0002] The main function of the hub bearing is to bear weight and provide precise guidance for the rotation of the hub. It bears both axial load and radial load, and is a very important component. Traditional automobile wheel bearings are composed of two sets of tapered roller bearings or ball bearings. The installation, oiling, sealing and clearance adjustment of the bearings are all carried out on the automobile production line. The first generation hub bearings are double-row angular contact ball bearings or double-row tapered roller bearings with an integral outer ring and inner ring back-to-back combination. In order to ensure that the preload after installation is within the specified range, the initial bearing clearance is preset. Space...

AI Technical Summary

Problems solved by technology

Due to the adoption of new technology, the third-generation hub bearing is no longer a bearing in the traditional sense. Its inner shaft ring is a stepped solid shaft with a flange at one end. Because of its high precision and special structure, it is difficult to process; the bearing industry The fixture commonly used in the grinding and positioning process of the inner shaft ring of rolling bearings is the electromagnetic centerless fixture. The positioning of the electromagnetic centerless fixture is composed of magnetic poles and supports. It has the advantages of simple structure, strong versatility, and convenient modification. The magnetic pole is on the electromagnetic fixture. The transition piece connecting the iron core and the workpiece is also a replacement piece matched with workpieces of different sizes. It plays the role of magnetic conduction and supporting the end surface of the workpiece. In order to reduce the contact area between the magnetic pole and the end surface of the workpiece and the mutual wear, the magnetic pole often Make it into a cup shape, and open 3 to 4 gaps on the circumference of the contact end with the workpiece, so as to facilitate the discharge of coolant and grinding debris from here, and take away part of the grinding heat; the grinding positioning process of the inner shaft ring of the bearing, The products are processed with one end face and the outer circle of the inner shaft ring of the bearing as the processing datum plane; the grinding positioning of the inner shaft ring of the bearing in the prior art is based on the end face A of the stepped solid shaft of the inner shaft ring as the processing datum plane. The inner shaft ring of the third-generation wheel hub bearing has a smaller diameter and longer length than the end face A of the stepped solid shaft, and the other end has a flange. If the end face A of the stepped solid shaft of the inner shaft ring is used as the processing reference, the magnetic pole magnetic force will reach If the processing requirements are not met, the processed product will be tilted, the processing accuracy will be poor, and even accidents that endanger personal safety such as the product being punched out by the grinding wheel will occur.

Therefore, the existing magnetic pole positioning method cannot meet the processing accuracy of the product

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