Cassettes are a key component for power transmission and smooth shifting, and their construction consists of sprockets and spiders. The sprocket receives the force generated by pressing the pedal through the chain and rotates the rear wheel. It is a circular part. As the shifting system for efficient driving of bicycles has been developed, chains and sprockets require more complicated shapes than the conventional ones, and researches are being conducted to increase the production efficiency of sprockets. Cr-Mo steel is mainly used as the material for sprockets, but the trend of converting high-performance cassette material to titanium, which is a material with high specific strength, is gradually increasing. In this study, we also studied the molding technology of titanium material for the 5th and 6th stage shape design, the finite element analysis and the mass production using the press mold.

The driving efficiency in vehicles depends on a weight lightening of wheels. Lightweight aluminum wheel research has been widespread over the years. Carbon wheels reduce weight by 50% compared to aluminum wheels and have high tensile strength and low heat absorption. This study was investigated to apply the carbon fiber of molding pressure to produce the carbon wheel. Carbon wheel of mold structure analysis was performed.

The reduction of setup time is very important in a lot production system. A punch press is a typical system of lot production. This paper describes a case study to reduce setup time of a punch press manufacturing system. Especially, this case study reduce