Tool-path correcting apparatus and tool-path correcting method

A tool-path correcting apparatus comprising:

• a cut-point calculating circuit to, on the basis of tool path data in which movement of a tool for machining a machining target object or the machining target object is described, tool data of the tool, and shape data of a machining shape of the machining target object, dispose the tool at a command point described in the tool path data and calculate cut point information, which is information concerning cut points by the tool on a machining curved surface of the machining shape by the shape data;
• a correction-command-point extracting circuit to extract, on the basis of the tool path data and the cut point information, two first and second command points of the command points as correction command points, which are command points that should be corrected, when first and second cut points respectively corresponding to continuous two first and second command points of the command points described in the tool path data are discontinuous along the machining curved surface;
• and
• a tool-path-data correcting circuit to correct the tool path data on the basis of the tool data, the shape data, the cut point information, and the correction command point to simultaneously have cut points with respect to two machining curved surfaces on which the first and second cut points respectively corresponding to the two first and second command points are present or have a cut point on a boundary between the two machining curved surfaces on which the first and second cut points are present.

A tool-path correcting method comprising:

• calculating, on the basis of tool path data in which movement of a tool for machining a machining target object or the machining target object is described, tool data of the tool, and shape data of a machining shape of the machining target object, as cut point information, which is information concerning cut points by the tool on a machining curved surface of the machining shape at a time when the tool is disposed at command points described in the tool path data, a coordinate of a contact point of the tool and the machining curve surface when the tool is in contact with the machining curved surface, calculating a coordinate of a nearest contact point of the tool and the machining curved surface on the machining curved surface when the tool is separated from the machining curved surface, or calculating a coordinate of a most distant point from the tool and the machining curved surface on the machining curved surface when the machining curved surface intrudes into an inside of the tool;
• extracting, on the basis of the tool path data and the cut point information, as correction command points, which are command points that should be corrected, command points where the tool is separated from the machining curved surface and the curved surface intrudes into the inside of the tool, among the command points described in the tool path data;
• determining command point correcting directions, which are directions in which the correction command points should be corrected, on the basis of the correction command points;
• and
• correcting the tool path data by correcting, on the basis of the tool data, the shape data, the cut point information, the correction command points, and the command point correcting directions, the correction command points according to the command point correcting directions such that the tool comes into contact with the machining curved surface.