Method and device for generation of machining program

A device for generating a machining program for subjecting a machining object to machining such that the machining object obtains a final product shape, wherein the machining is classified into a plurality of machining modes in correspondence with the final product shape, each of the machining modes being divided into a plurality of machining units, a unit machining shape being formed by a tool in correspondence with each of the machining units, the final product shape being obtained by forming a plurality of unit machining shapes, the device comprising:

• a numerical input portion for inputting a coordinate value and a machining dimension of a portion to be machined of the machining object with respect to an axis Z crossing a restricting surface for forming a pair of restricting surfaces in the portion to be machined, wherein the pair of restricting surfaces hold the portion to be machined in between, and the machining dimension corresponds to the space between the pair of restricting surfaces;
• a tool determining portion for determining the unit machining shape based on the inputted coordinate value and the machining dimension and determining the tool in accordance with the machining unit associated with the determined unit machining shape;
• a shape input portion for inputting data about a cross-sectional shape of the portion to be machined and data about a cross-sectional shape of a portion resulting from cutting of the portion to be machined, wherein the cross-sectional area of the cut resulting portion crossing the axis Z is smaller than the area of each of the restricting surfaces, wherein the cut resulting portion is eccentric in relation to the restricting surfaces;
• and
• a generating portion for generating a machining path in correspondence with the data about the cross-sectional shapes and the determined tool, wherein the machining path extends along a direction perpendicular to the axis Z, wherein the portion to be machined is rotated about the axis Z at an associated predetermined rotation angle, the machining path being defined for each rotation angle, wherein the machining program is generated based on the generated machining path and the determined tool.

A method for machining a portion to be machined held between a pair of restricting surfaces, thereby forming a portion that has a cross-sectional area smaller than each of the restricting surfaces and is eccentric in relation to the restricting surfaces, wherein an axis Z extending perpendicular to the restricting surfaces is defined in the portion to be machined, the method comprising:

• inputting a coordinate value of the portion to be machined with respect to the axis Z, and a width of the space between the pair of the restricting surfaces;
• determining a unit machining shape based on the inputted coordinate value and width;
• determining a tool based on a machining unit related to the determined unit machining shape;
• generating a machining path extending along a direction perpendicular to the axis Z based on data about a cross-sectional shape of the portion to be machined intersecting the axis Z, data about a cross-sectional shape of a portion resulting from cutting of the portion to be machined, and the determined tool, wherein the portion to be machined is rotated about the axis Z at an associated predetermined rotation angle, the machining path being defined for each rotation angle;
• and
• rotating the portion to be machined by the predetermined angle at a time to move the tool along the machining path for each rotation angle, thereby machining the portion to be machined.