Cold ring rolling forming process for asymmetric shape of hub bearing outer ring and closed cold rolling forming die

Abstract

The invention provides a cold ring rolling forming process for an asymmetric shape of a hub bearing outer ring. The cold ring rolling forming process comprises the steps of 1) blanking, 2) upsetting, 3) forming, 4) punching and 5) cold ring rolling. The forming comprises the steps of a), designing a forged forming piece, and b) designing the size of cold rolling blank. The step 5) of cold ring rolling specifically comprises the step that the cold rolling blank is closed between a rolling wheel and a rolling core shaft of a closed cold rolling forming die to be formed in a ring rolling mode. The closed cold rolling forming die comprises the rolling wheel and the rolling core shaft, and the two ends of the ring rolling core shaft are designed to be of symmetrical structures with bosses on the peripheries. The cold ring rolling forming process for the asymmetric shape of the hub bearing outer ring has the advantages that materials are saved, efficiency is improved to a large extent, and subsequent processing is simple and convenient; the closed cold rolling forming die is adopted for enable the cold rolling blank to be formed in the ring rolling mode, the depth of the rolling wheel is large and contains the two end faces of the cold rolling blank, the bosses of the ring rolling core shaft enable a finished product to be completely closed after the cold rolling blank is formed, and the symmetry degree of the formed finished product is ensured.

Description

technical field [0001] The invention relates to the field of a first-generation hub bearing outer ring of a car front wheel system, in particular to an asymmetric shape cold rolling forming process and a closed cold rolling forming mold for a hub bearing outer ring. Background technique [0002] The outer ring of the first-generation hub bearing is an important running part of the front wheel of a car, and its life and reliability have strict requirements. The front wheel hub bearing assembly is mainly composed of outer ring, steel ball, seal and inner ring. The inner ring is basically closely matched with the axle, the outer ring is matched with the front wheel system, and the car rotates with the car when it is running. The outer rings of this series of bearings are mainly formed by hot forging (see figure 1 ), hot forging, heating, rolling and expanding (see details figure 2 ), hot forging and cold rolling and forming are relatively common. [0003] At present, high-...

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Problems solved by technology

[0004] Therefore, how to design the forging and cold rolling forming process is the key problem for technicians to solve. If the process design is not good or unreasonable, the finished product cannot be cold rolled and expanded stably.

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