Investigation for Estimating Form Accuracy Ground by a Generating Mechanism (Guide Lines based on Simulation for Design and Grinding Condition)

Abstract

A rotor housing is one of main parts that compose combustion chambers of Wankel engine. The inside of it is peri-trochoidal form is shape. It is ground with a grinding wheel at a fixed point on the locus of workpiece moved by a generating mechanism. Workpiece radius and speed at the grinding point vary considerably. Inertia force, torque and grinding force that are caused in the grinding process, elastically deform this mechanism and wheel axis system in proportion to the square of workpiece rotational speed. Therefore, the positional errors arise between a workpiece and a grinding wheel and those affect grinding form. To grind it efficiently and accurately, it is extremely important in the design process of grinding machine and in the processing of peri-trochoidal form to forecast quantitatively the ground form accuracy under such grinding condition. In this report, the form accuracy has been analyzed by grinding simulation system when the conditions variously change. Useful and effective guidelines are obtained for designing the machine and grinding the form.