| 摘要 |
PROBLEM TO BE SOLVED: To provide a minute concave forming device which can form minute concaves on the inner circumferential surface of a round hole with high precision, and also to provide a method for using the same. SOLUTION: The invented minute concave forming device 1 is equipped with: a tool holder 10 which is rotationally driven coaxially with a cylinder bore B; a roller supporting member 12 which is movable in the diametral direction of the tool holder 10; a form roller 13 which is free to rotate with regard to the roller supporting member 12; a first compression coil spring 18A which presses the roller supporting member 12 in such a direction that the form roller 13 advances to the inner circumferential face of the cylinder bore B; and a second compression coil spring 18B which presses the roller supporting member 12 in such a direction the form roller 13 backs off the inner circumferential face of the cylinder bore B. The invented device 1 can form minute concaves which are uniform in size and depth, with the rotation of the tool holder 10 offsetting at least centrifugal force acting on the form roller 13. COPYRIGHT: (C)2007,JPO&INPIT
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