Abstract
Here we offer a type of gear which has three parts of structure being composed of an outer shell, a shaft part and a part being filled into the part enclosed by the outer shell and the shaft. These three parts are to be manufactured independently, by using adaptable materials and processes for gear. Then these parts are combined as one gear. We nominate it as a case gear.
In this report we explain the manufacturing process of the outer shell which is the main subject in case gear making.
We have completed the outer shell of steel plate by liquid spark forming method.
