TOOL HOLDER

摘要

PROBLEM TO BE SOLVED: To reduce interference of a tool holder with a workpiece W and to enhance rigidity. SOLUTION: The shrink fitting type tool holder A is provided with a shank part 11 attachable/detachable to/from a machining center and with a chuck part 12 for holding a cutting tool 5 with an R cutting blade 5a in a shrink fitting method. The outer periphery of the chuck part 12 is a concave face 12a having intended length L from the tip part of the chuck part 12 toward the shank part 11. When the workpiece W is cut by inclining the cutting tool 5, since the concave shape avoids a projecting part interfering with the workpiece W, the diameter in a position from the tip of the chuck part 12 of the concave shape can be set larger than the diameter in the same position of a truncated cone shape, so as to enhance the rigidity of the chuck part 12. The enhancement of the rigidity enhances processing accuracy, improves finishing accuracy and elongates the service life of the cutting tool 5. The concave face 12a is allowed to have a curvature along a processed surface. The chuck part 12 can be divided into portions (12a1, 12a2) in the lengthwise direction and the respective divided portions (12a1, 12a2) can be fitted and integrated. COPYRIGHT: (C)2009,JPO&INPIT