JP2001195605A5 - - Google Patents

Claims (8)

  In the three-dimensional shape processing method capable of processing a rotation surface, the boundary curve on the rotation surface to be processed is trimmed by a plane, and each of the divided boundary curves is formed into a closed loop, and the rotation is performed. A three-dimensional shape processing method characterized by expressing a surface.   3. The three-dimensional shape processing method according to claim 1, wherein a plane on which a predetermined point on the generatrix of the rotating surface and the axis of the rotating surface ride is a plane that divides the boundary curve on the rotating surface. Dimensional shape processing method.   3. The three-dimensional shape processing method according to claim 2, wherein the plane is determined such that one of the intersecting lines of the plane and the plane of rotation that divides the plane of rotation is the position of the seam of the plane of rotation. Method.   4. The three-dimensional shape processing method according to claim 3, wherein a boundary curve obtained by dividing a portion of a curve obtained by rotating a generatrix projected at a position of a seam on a plane by 180 degrees about an axis of a rotation plane is a closed loop. A three-dimensional shape processing method, characterized in that the curve is a curve for performing the processing.   4. The three-dimensional shape processing method according to claim 2, wherein, for a plurality of sample points on the generating line of the rotating surface, a distance between the sample point and the axis of the rotating surface, and a projection obtained by projecting the sample point onto the axis of the rotating surface. An error distance between the sample projection point having the same on-axis projection point as the sample point on the plane and a sample projection point having a distance from the same axis, and the curve obtained by projecting the sample projection point and the bus on the plane And if the error distance is within a predetermined value for all of the plurality of sample points, the projected curve is adopted as a projected bus.   6. The three-dimensional shape processing method according to claim 5, wherein if all error distances are not within a predetermined value, a rotation plane is generated by rotating a generatrix before projection around the axis as a rotation axis, and the rotation plane and the A three-dimensional shape processing method characterized by obtaining an intersection line with a plane and adopting the intersection line as a projected bus. In a three-dimensional shape processing method capable of processing a rotation surface, a first step of reading out three-dimensional shape data including a rotation surface to be processed and obtaining a plane that divides the rotation surface into two, and a generatrix of the rotation surface A second step of projecting the obtained curve onto the obtained plane, and a third curve for obtaining a second curve obtained by rotating the first curve around the axis of the plane of rotation with the projected generatrix as a first curve. Forming a loop by connecting the boundary curve on one of the divided rotation surfaces with a part of the second curve, and forming the loop as an outer boundary; and the outer boundary belongs to A loop is formed by connecting the boundary curve on the other divided rotation surface with a part of the second curve by using the fifth step for obtaining a generating surface, and using the loop as an external boundary. A sixth step for obtaining a mother curved surface to which the member belongs 3-dimensional shape processing method according to claim Rukoto. A storage medium storing a program, wherein the program programmed according to the three-dimensional shape processing method according to any one of claims 1 to 7 is stored.