Cutting method and cutting apparatus

A cutting apparatus that cuts an inner circumferential surface of a rotating hollow cylindrical workpiece, the cutting apparatus comprising:

• a chucking device that has a contact surface configured to contact with a side surface of the workpiece on a first side in an axial direction of the workpiece, and that is configured to hold the workpiece;
• a linear tool with a button tip mounted at a distal end of the linear tool;
• a head that has the linear tool mounted thereon such that an intersection angle between a rotational center line of the workpiece and an imaginary straight line parallel to an axis line of the button tip and intersecting with the rotational center line of the workpiece is smaller than 45 degrees, and that rotatably supports the linear tool;
• and
• a feed mechanism that includes a motor, a speed reducer that reduces a speed of a motor output of the motor, and a ball screw rotated by the motor, and configured to feed the button tip along the inner circumferential surface of the workpiece in a direction from a second side in the axial direction of the workpiece toward the first side in the axial direction of the workpiece, wherein
• the contact surface of the chucking device includes a recess to receive a portion of the button tip during machining of the inner circumferential surface adjacent to the first side of the workpiece.

A cutting apparatus that cuts an inner circumferential surface of a rotating hollow cylindrical workpiece, the cutting apparatus comprising:

• a chucking device that has a contact surface configured to contact with a side surface of the workpiece on a first side in an axial direction of the workpiece, and that is configured to hold the workpiece;
• a linear tool with a button tip mounted at a distal end of the linear tool;
• a head that has the linear tool mounted thereon such that an intersection angle between a rotational center line of the workpiece and an imaginary straight line parallel to an axis line of the button tip and intersecting with the rotational center line of the workpiece is smaller than 45 degrees, and that rotatably supports the linear tool;
• and
• a feed mechanism that includes a motor, a speed reducer that reduces a speed of a motor output of the motor, and a ball screw rotated by the motor, and configured to feed the button tip along the inner circumferential surface of the workpiece in a direction from a second side in the axial direction of the workpiece toward the first side in the axial direction of the workpiece, wherein
• a length of the linear tool with the button tip in the axial direction of the workpiece is longer than a length of the workpiece in the axial direction of the workpiece, and the linear tool when disposed inside of the workpiece does not to interfere with the inner circumferential surface of the workpiece.