Device and method for extracting unmachined shape

A method for extracting an unmachined shape with respect to a product shape upon machining a product, comprising:

• virtually displacing a machining tool corresponding to a selected point among predetermined points on a surface of a three-dimensional product shape model without causing interference between the product shape model and the machining tool by moving the machining tool in a direction vertical to the surface of the three-dimensional product shape model if interference between the product shape model and the machining tool occurs, thereby eliminating said interference;
• obtaining a distance between each of the predetermined points on the surface of the product shape model and corresponding projected points on the machining tool surface;
• and
• preparing a three-dimensional unmachined shape by considering a shape of the machining tool surface using minimum values of the distances obtained regarding each of the predetermined points on the surface of the shape model and the corresponding points on the machining tool surface shape corresponding to a shape of the machine tool with the unmachined shape having cusps.

A program executing in a computer extracting an unmachined shape with respect to a product shape upon machining a product, comprising

• a procedure of virtually displacing a machining tool corresponding to a selected point among predetermined points on a surface of a three-dimensional product shape model without causing interference between the product shape model and the machining tool by moving the machining tool in a direction vertical to the surface of the three-dimensional product shape model if interference between the product shape model and the machining tool occurs, thereby eliminating said interference;
• a procedure of obtaining a distance between each of the predetermined points on the surface of the product shape model and corresponding projected points on the machining tool surface;
• and
• a procedure of preparing a three-dimensional unmachined shape by considering a shape of the machining tool surface using minimum values of the distances obtained regarding each of the predetermined points on the surface of the shape model and the corresponding points on the machining tool surface shape corresponding to a shape of the machine tool with the unmachined shape having cusps.

A storage medium used by a computer extracting an unmachined shape with respect to a product shape upon machining a product, storing a program which causes the computer to execute:

• virtually displacing a machining tool corresponding to a selected point among predetermined points on a surface of a three-dimensional product shape model without causing interference between the product shape model and the machining tool by moving the machining tool in a direction vertical to the surface of the three-dimensional product shape model if interference between the product shape model and the machining tool occurs, thereby eliminating said interference;
• obtaining a distance between each of the predetermined points on the surface of the product shape model and corresponding projected points on the machining tool surface;
• and
• preparing a three-dimensional unmachined shape by considering a shape of the machining tool surface using minimum values of the distances obtained regarding each of the predetermined points on the surface of the shape model and the corresponding points on the machining tool surface shape corresponding to a shape of the machine tool with the unmachined shape having cusps.

A method, comprising:

• designating points of a virtual machined work piece shape;
• projecting a machine tool to the points;
• determining distances to a machined work piece shape surface from a tool surface at the points and moving the machine tool in a direction vertical to the surface of the machined work piece shape surface if interference between the machined work piece shape surface and the machine tool occurs, thereby eliminating said interference;
• determining an unmachined work piece shape from the distances and corresponding points on the tool surface corresponding to a shape of the machine tool with the unmachined shape having cusps;
• and
• displaying the unmachined work piece shape.

A method, comprising:

• projecting a machine tool to points of a virtual machined work piece shape;
• determining an unmachined work piece shape having cusps from the distances obtained of a virtual machined work piece shape and corresponding points on the tool surface corresponding to a shape of the machine tool by moving the machine tool in a direction vertical to the virtual machined work piece shape if interference between the virtual machined work piece shape and the machine tool occurs, thereby eliminating said interference;
• and
• displaying the unmachined work piece shape.