Path calculation program, processing apparatus, path calculation method, tool, and processed article

A path calculation method for calculating in a computer apparatus a tool path for processing a curved processed part formed by a hole provided in a curved-surface-shaped workpiece, comprising:

• inputting workpiece shape information about a shape of the workpiece and a shape of the curve;
• inputting tool shape information about a shape of the tool;
• calculating a first tangent vector to the curve at the specified point on the curve;
• calculating an addition vector obtained by adding a second tangent vector, of an intersection line of a normal plane to the first tangent vector and including the specified point with a thick internal surface of a hole, to a third tangent vector, of an intersection line of the normal plane with the curved surface, at a predetermined ratio;
• and
• calculating a tool position that is located on a straight line extending from the specified point and including the calculated addition vector, and enables the specified point to be processed by the tool based on the input tool shape information,
• wherein the calculating the tool position is calculating the tool position with a plurality of points on the curve set as specified points to calculate the tool path.

A processing system for calculating a tool path for processing a curved processed part formed by a hole provided in a curved-surface-shaped workpiece, controlling the tool path in accordance with the calculated path, and processing the workpiece, the system comprising:

• a workpiece shape information inputter configured to input workpiece shape information about a shape of the workpiece and a shape of the curve;
• a tool shape information inputter configured to input tool shape information about a shape of the tool;
• a first tangent vector calculator configured to calculate a first tangent vector to the curve at the specified point on the curve;
• an addition vector calculator configured to calculate an addition vector obtained by adding a second tangent vector, of an intersection line of a normal plane to the first tangent vector and including the specified point with a thick internal surface of a hole, to a third tangent vector, of an intersection line of the normal plane with the curved surface, at a predetermined ratio;
• and
• a tool position calculator configured to calculates the tool position that is located on a straight line extending from the specified point and including the calculated addition vector, and enables the specified point to be processed by the tool based on the input tool shape information,
• wherein the tool position calculator calculates the tool position with a plurality of points on the curve set as specified points to calculate the tool path,
• the system further comprises
• a processor configured to process the workpiece by controlling the tool path in accordance with the calculated path,
• the tool includes a neck and a blade connected to a tip end of the neck, and
• the blade has a spherical segment part formed in a shape in which the sphere is partially cut by a surface.