Precise centering fixture for repairing back lining bearing

Abstract

A precise centering fixture for repairing back lining bearing is used for repairing back lining bearing. An outer ring is arranged at the outer part of a keeping apparatus; a steel ball is embedded in the window of the keeping apparatus; a deflector rod is connected on a mandrel, and the mandrel is connected with a centering ring through interference fit integrally; one end of a positioning rod is connected with the mandrel and the other end thereof is inserted in the hole of a limiting plate; the limiting plate is connected on one side of the keeping apparatus; a limit stop is connected with one side of the keeping apparatus; a rigid ring is sheathed outside the steel ball in the window of the keeping apparatus; the longitudinal section of the centering ring is dumbbell-shaped, and uniformly distributed circular arcs with alternating wave crests and troughs are arranged at the contact positions of the radial circumferences on the edges of the two sides of the centering ring and the steel ball; and a baffle is connected on the other end of the keeping apparatus. The bearing is sheathed on the mandrel, the outer ring of the back lining bearing is accurately positioned on the mandrel through the elastic approach amount of the precise steel ball; enough load is used for bearing the grinding force in the tangential direction for grinding the outside diameter of the bearing sleeve with high precision to realize the centering maintenance of the back lining bearing. The mounting operation is convenient, the centering precision is high, the sealing property is good, the grinding precision is high, and the application range is extensive.

Description

Technical field [0001] The invention relates to a jig for grinding the outer ring of a high-precision bearing outer ring in the machinery industry, in particular to a centering jig for grinding the outer ring of a backing bearing. Background technique [0002] The backing bearings are mainly used for the back-up rolls on the 20-high Sendzimir cold rolling mill exclusively manufactured in Germany. Each unit uses 32 sets of backing bearings, which are bearings with high precision requirements. The twenty-high cold rolling mill is used for rolling high-strength metal and alloy thin strips, high-precision strips, and extremely thin strips with a thickness of 0.005-0.06mm. The rolling force is passed by the working rolls through the first and second The intermediate rolls pass to the backing bearings. [0003] The backing bearing is a multi-row cylindrical roller bearing with an accuracy grade of P2, especially the H tolerance value of the section height from the inner diameter ...

AI Technical Summary

Problems solved by technology

The supporting plate is required to have high hardness and wear resistance; it is suitable for processing bearings with an outer diameter within 200mm; it is not suitable for finishing of backing bearings

[0007] 3. Solid cylindrical mandrel: its machining accuracy depends on the precision of the mandrel and the matching precision between the workpiece and the mandrel, it is difficult to meet the requirements of P2 level, and it is not suitable for the finishing of backing bearings

[0008] 4. Hydraulic centering mandrel: it relies on a certain pressure of oil to fill between the workpiece and the centering mandrel, and floats the workpiece to center it. The end face of the workpiece is pressed by a pressure wheel; its highest precision can only reach P4 grade, this device is not suitable for finishing of backing bearings

[0009] 5. Foreign matching mandrel with expansion sleeve: the machining accuracy of the bearing can be about 0.003mm. Since the expansion sleeve and the center hole in the mandrel are easy to collide and wear quickly during use, the elasticity of the expansion sleeve will also decrease during use. As a result, the accuracy and service life of the fixture are affected; the accuracy is difficult to repair after wear and tear, and the tolerance range of the raceway size of the backing bearing is required to be within 0.03mm, and the ellipticity Δd1mp is within 0.003mm; the machining accuracy of the backing bearing is not easy to obtain reliable guarantee

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