Machine tool and workpiece inner surface machining method using the machine tool

A machine tool machining a surface to be machined located on an inner surface of a workpiece, the machine tool comprising:

• a tool having a supporting member and a cutting tool which is supported to be pivotable about a pivot axis located on a plane perpendicular to an axis of the supporting member and has a cutting edge at least at one end;
• an axial feed mechanism rotating the supporting member about the axis and moving the supporting member in a direction of the axis;
• a pivot driving mechanism pivoting the cutting tool about the pivot axis;
• a workpiece driving mechanism rotating the workpiece about the axis;
• and
• a machining control mechanism controlling a pivot angle of the cutting tool decided by said pivot driving mechanism and a rotation speed and an axial-direction position of the supporting member decided by said axial feed mechanism so as to set a machining point by the cutting edge at a desired position, and causing said workpiece driving mechanism to rotate the workpiece.

A workpiece inner surface machining method of machining a surface to be machined located on an inner surface of a workpiece by a machine tool which comprises:

• a workpiece holding mechanism holding the workpiece;
• a tool having a supporting member and a cutting tool which is supported to be pivotable about a pivot axis located on a plane perpendicular to an axis of the supporting member and has a cutting edge at least at one end;
• an axial feed mechanism rotating the supporting member about the axis and moving the supporting member in a direction of the axis;
• a pivot driving mechanism pivoting the cutting tool about the pivot axis;
• and a machining control mechanism controlling a pivot angle of the cutting tool decided by the pivot driving mechanism and a rotation speed and an axial-direction position of the supporting member decided by the axial feed mechanism, so as to make a machining point by the cutting edge move along a desired machining line, the method comprising:
• a first step of causing the workpiece holding mechanism to fixedly hold the workpiece;
• a second step of causing the axial feed mechanism and the pivot driving mechanism to support the tool;
• a third step of inserting the tool into the workpiece and positioning the tool at a machining start position;
• and
• a fourth step of controlling the pivot angle of the cutting tool decided by the pivot driving mechanism and the rotation speed and the axial-direction position of the supporting member decided by the axial feed mechanism, so as to make the machining point by the cutting edge of the cutting tool move along the desired machining line.

A workpiece inner surface machining method of machining a surface to be machined located on an inner surface of a workpiece by a machine tool which comprises:

• a tool having a supporting member and a cutting tool which is supported to be pivotable about a pivot axis located on a plane perpendicular to an axis of the supporting member and has a cutting edge at least at one end;
• an axial feed mechanism rotating the supporting member about the axis and moving the supporting member in a direction of the axis;
• a pivot driving mechanism pivoting the cutting tool about the pivot axis;
• a workpiece driving mechanism rotating the workpiece about the axis;
• and a machining control mechanism controlling a pivot angle of the cutting tool decided by the pivot driving mechanism and a rotation speed and an axial-direction position of the supporting member decided by the axial feed mechanism so as to set a machining point by the cutting edge at a desired position, and causing the workpiece driving mechanism to rotate the workpiece, the method comprising:
• a first step of causing the workpiece driving mechanism to hold the workpiece in a rotatable manner about the axis;
• a second step of causing the axial feed mechanism and the pivot driving mechanism to support the tool;
• a third step of inserting the tool into the workpiece to position the tool at a machining start position;
• and
• a fourth step of controlling the pivot angle of the cutting tool decided by the pivot driving mechanism and the rotation speed and the axial-direction position of the supporting member decided by the axial feed mechanism so as to set the machining point by the cutting edge of the cutting tool at the desired position, and rotating the workpiece.

A machine tool machining an inner surface to be machined located on an inner surface of a workpiece and an outer surface to be machined located on an outer surface of the workpiece, the machine tool comprising:

• an inner tool having a supporting member and a cutting tool which is supported to be pivotable about a pivot axis located on a plane perpendicular to an axis of the supporting member and has a cutting edge at least at one end;
• an axial feed mechanism rotating the supporting member about the axis and moving the supporting member in a direction of the axis;
• a pivot driving mechanism pivoting the cutting tool about the pivot axis;
• a workpiece driving mechanism rotating the workpiece about the axis;
• an outer tool machining the outer surface to be machined of the workpiece;
• an inner machining control mechanism controlling a pivot angle of the cutting tool decided by said pivot driving mechanism and a rotation speed and an axial-direction position of the supporting member decided by said axial feed mechanism, so as to make a machining point by the cutting edge move along a desired machining line;
• and
• an outer machining control mechanism causing said workpiece driving mechanism to rotate the workpiece and controlling a depth of cut by said outer tool.

A machine tool machining an inner surface to be machined located on an inner surface of a workpiece and an outer surface to be machined located on an outer surface of the workpiece, the machine tool comprising:

• an inner tool having a supporting member and a cutting tool which is supported to be pivotable about a pivot axis located on a plane perpendicular to an axis of the supporting member and has a cutting edge at least at one end;
• an axial feed mechanism rotating the supporting member about the axis and moving the supporting member in a direction of the axis;
• a pivot driving mechanism pivoting the cutting tool about the pivot axis;
• a workpiece driving mechanism rotating the workpiece about the axis;
• an outer tool machining the outer surface to be machined of the workpiece;
• an inner machining control mechanism controlling a pivot angle of the cutting tool decided by said pivot driving mechanism and a rotation speed and an axial-direction position of the supporting member decided by said axial feed mechanism, so as to set a machining point by the cutting edge at a desired position;
• and
• an outer machining control mechanism causing said workpiece driving mechanism to rotate the workpiece and controlling a depth of cut by said outer tool.