| 摘要 |
PURPOSE:To allow the form and size of chamber to be delicately adjusted with ease by allowing chamfering made to a boat groove of a rotor to be processed through two step finishes of machining where a rotary tool is used in two steps. CONSTITUTION:In working, one edge 2b, which is formed in the longer direction of a boat groove 2 formed on the circumferential surface 1a of a rotor 1, is removed first so as to finish the first step chamfer 10. That is, the groove edge 2b is grinded off by moving a disc grind-stone 11 to the transverse direction crossing the boat groove 2. Subsequently, the flat surface of the first step chamfer 10 is digged down into a circular arc form along the longer direction of the boat groove 2 so as to finish the second step chamfer 12. That is, the second step is finished by pressing a small rotary disc grinder 13 against the surface of the first step chamfer 10 toward the shaft center O of the rotor 1. In this place, the thickness of the rotary disc grinder is identical to the finishing width W1: the total of the width of the boat groove 2 and the width of the first step chamfer 10 which has been formed on the both sides of the groove.
|
