Method for machining camholes of zooming mechanism and tools for machining the camholes

摘要

A tool is inserted into a hole formed in a cam hole starting end of the cam barrel in order to prevent deformation and to improve zooming precision when the cam hole including the chamfer is completed by one reciprocating operation, So that the outer chamfering of the cam hole is simultaneously performed by the upper inclined portion of the large diameter portion while the tool is raised at the end of the cam hole so that the upward inclined portion of the tip is in contact with the inner end of the cam hole The inner chamfering process being performed while the inner chamfering process is being performed; In order to process the cam hole as described above, a tip portion is provided at the lower end of the body, and a small diameter portion and a large diameter portion are formed in two stages on the upper side thereof. The small diameter portion and the tip, and the boundary portion between the large diameter portion and the body, A tool formed by a ramp for chamfering.