Cam driving device and processing method

A cam driving device for a processing device comprising:

• a cylindrical member;
• a rotational shaft that is provided in the cylindrical member and has a mount hole formed on an outer peripheral surface thereof;
• a cam provided to the rotational shaft;
• a tool that is mounted in the mount hole of the rotational shaft so that the tool can be protruded and retracted through the mount hole in a radial direction of the rotational shaft in accordance with a profile of the cam, the cylindrical member and the rotational shaft being axially reciprocated to process a non-circular bore;
• a system performing a simulation, under a condition that an assembly member is assembled to an assembly target member having a bore having a desired cross-sectional shape, to simulate how the bore is deformed and thus what shape the bore has after the assembly on a computer;
• a storage unit for storing a data table created on the basis of shape data obtained on the basis of the simulation and representing associating relationship between a rotational angle of the cam and a protrusion amount of the tool which is provided on a basis of the rotational angle of the cam;
• and
• a controller for advancing or retarding the rotational angle of the rotational shaft with respect to the cylindrical member according to the data table stored in the storage unit,
• wherein the cam is cylinder shaped with a circular end face, and a rotational center of the cam is offset from a geometric center of the circular end face of the cam.