| Summary: | 碩士 === 國立中央大學 === 機械工程學系在職專班 === 103 === Deep groove ball bearings are the most common machine elements and widely used in many fields of industries such as machine, bicycle, automotive and motorcycles.
There are mainly three methods for bearing ring production and the starting shapes can be in the configuration of rods and seamless tubes. Because of rods and tubes methods are used as raw material and the ring form is given by machining processes, so that the ratio of the waste material is high in forging process. At the end of turning operations the material waste is around 35% of the initial weight. In the third method, ring form is given by hot forging and cold rolling processes and the waste ratio decrease down to 7%.
The complete hot forging process consists of hot forging, spherodizing heat-treatment, sandblasting and cold ring rolling process. The aim of the study is to investigate the tooling wear and defects in hot forging process. The major cause of defect formation and possible remedies are proposed in the precision hot forging and cold ring rolling processes with validated experimental results.
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