Japan's Seiko Hub Assembly Bearings Produced for the First Time in the World

For the first time, Seiko Co., Ltd. of Japan produced the cold-forged hub assembly bearings. The hub assembly bearing is a hub axle that will be mounted on the wheel, and an assembly bearing that is integrated with the outer ring that is mounted on the vehicle body. Among them, the manufacturing method of the hub axle is changed from hot forging to cold forging, reducing the energy required for manufacturing and reducing the weight.

When cold-forging the hub axle, the processing pressure needs to increase. Nippon Seiko solved this problem by developing a new side extrusion method, which was made public in 2007. Afterwards, Nippon Seiko recommended this method to car manufacturers.

With the cold forging method, the energy consumption when forging the hub axle can be reduced by about 70%. The energy consumption when manufacturing the entire bearing is reduced by 27%. In addition, it can also reduce the machining allowance of machining and reduce the amount of steel by 20 to 30%. From the entire bearing is reduced by 10 to 15%. In cold forging, work hardening effects are obtained and surface finish is increased. Japanese Seiko used this to reduce the weight of the entire bearing by 5%.