Method for precisely cold-rolling and forming outer ring of tapered roller bearing

Abstract

The invention discloses a method for precisely cold-rolling and forming an outer ring of a tapered roller bearing. The method comprises the following steps: S1, designing a ring blank: a ring blank tapered hole and a ring blank cylindrical hole are coaxially arranged in the ring blank, the small-diameter ends of the ring blank tapered hole and the ring blank cylindrical hole are connected, the diameter of the ring blank cylindrical hole is less than the diameter of the small-diameter end of the ring blank tapered hole; S2, cold-rolling and forming: a cold-rolling hole pattern comprises workingsurfaces of a driving roll and core roll, the shape of the working surface of the driving roll and the shape of the outer surface of an outer ring piece are consistent, the shape of the working surface of the core roll and the shape of the inner surface of the outer ring piece are consistent, the driving roll and the core roll are both designed to I-shapes, the ring blank is put between the driving roll and the core roll, the upper end and the lower end of the driving roll and the core roll axially constraint the ring blank, the driving roll does rotating motion, meanwhile, the core roll doesradial feeding motion, and then the ring blank is cold-rolled and formed. The method has the advantages that the forming precision is high and the product quality, the material efficiency and the processing efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of bearing manufacturing, and in particular relates to a precision cold rolling forming method for the outer ring of a tapered roller bearing. Background technique [0002] Tapered roller bearings, as a type of typical rolling bearings that can bear radial and axial combined loads, are widely used in the fields of automobiles, rolling mills, mines, and metallurgical equipment, especially for the support and transmission of high-speed heavy-duty equipment. The bearing ring (including the inner ring and the outer ring) is the base of the bearing, which has a decisive impact on the service performance and life of the bearing, and is the core of the bearing manufacturing. Due to the complex shape of tapered roller bearing rings, cutting after hot forming is generally used in industrial production. The hot forming process is mainly forging extrusion forming or hot rolling after forging extrusion blanking. [000...

AI Technical Summary

Problems solved by technology

[0003] The traditional thermal forming method of tapered roller bearing rings has the following significant problems in terms of technical economy and forming quality: 1. High energy consumption, large burning loss, and low material utilization rate; 2. Low forming accuracy and large cutting volume. The integrity of the metal flow line is greatly damaged; 3. The grain structure is relatively coarse

However, tapered roller bearing rings have geometric characteristics of asymmetric abrupt cross-section, and cold rolling forming is difficult, which puts forward high requirements for process design and planning, and it is very easy to cause instability and warping in the rolling process and cross-section due to unreasonable design planning. Incomplete forming and other defects, so the shape can only be simplified, rolled and formed, and then cut. Not only the consumables are time-consuming, but also a complete and reasonable distribution of metal streamlines cannot be obtained, which restricts the economic effect and product quality of cold rolling technology. Tapered roller bearings The precision cold-rolled forming technology of asymmetric cross-section bearing rings represented by rings is also a key technology that the current high-performance bearing manufacturing industry urgently needs to overcome.

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