Patent ID: 7561333
Filing Date: 2009-07-14
Classification: B23B,G02B

Abstract:
1. A method for manufacturing a mold comprising: creating a set of form coordinates representing a concave or convex portion; deriving a set of movement coordinates by moving the form coordinates; deriving a plurality of orbits for forming the concave or convex portion, based on the movement coordinates, for causing a cutting tool to perform a sun-and-planet movement; and fabricating a mold by forming the concave or convex portion, on or in, respectively, a member having a central axis by causing the cutting tool to perform the sun-and-planet movement along a combination of the orbits while rotating the member about the central axis so as to cut the member, the concave or convex portion having a center that does not match the central axis, wherein said deriving the plurality of orbits comprises deriving a first orbit which revolves around the central axis of the member and which connects two movement coordinates so as to cause the cutting tool to draw a spiral at a position away from the central axis, either from an outer periphery of the concave or convex portion toward the center or from the center toward the outer periphery of the concave or convex portion, and deriving a second orbit which revolves around the central axis of the member and causes the cutting tool to draw a circle at a position away from the central axis from a first movement coordinate to the first movement coordinate.