Old rolling forming method for tapered roller bearing inner ring

Abstract

The present invention discloses cold rolling forming method for tapered roller bearing inner ring, comprising the following steps of: S1, dividing the ring blank into a smoothly connected ring blank small cylinder, a ring blank small round table body, a ring blank large round table body and a ring blank large cylinder in the height direction sequentially; S2, forming a rolling groove by the working surfaces of a drive roller, a core roller and a guide roller. The drive roller, the core roller and the guide roller are both designed as an I-shaped structure, the working surface shape of the drive roller and the guide roller is consistent with the shape of the outer surface of the inner ring member, the working surface shape of the core roller is consistent with the shape of the inner surfaceof the inner ring member. The flanges at the upper and lower ends of the drive roller and the core roller and the guide roller are axially constrained to the both faces of the ring blank, respectively, driving roller to rotate. At the same time, the core roller performs the radial feed motion to perform cold rolling forming on ring blank. The cold rolling forming method for tapered roller bearinginner ring has the advantages that forming precision is high, and product quality, material utilization rate and processing efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of bearing manufacture, and in particular relates to a cold rolling forming method for the inner 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. [0003] The tradi...

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Problems solved by technology

[0003] The traditional thermal forming method of tapered roller bearing rings has some 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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