Tool holder

摘要

A tool holder includes a holder body (2) which in turn includes a shank portion (3), a flange portion (4), and a tool attachment portion (6); a tapered cone (8) fitted to the shank portion; an elastic member (7) interposed between a rear-end face of the flange portion (4) and a front-end face of the tapered cone (8); and a stopper member (9) disposed on the shank portion so as to support a rear-end face of the tapered cone (8). The outer surface of the tapered cone (8) is tapered at an angle equal to that at which the wall surface of a tapered hole (21) formed in a spindle of a machine tool is tapered. The inner surface of the tapered cone (8) and the outer surface of the shank portion (3) are equally tapered at an angle smaller than the angle at which the outer surface of the tapered cone (8) is tapered. Through drawings of the holder body, the tapered cone (8) expands radially to thereby be tightly held within the tapered hole (21). A spacer is bonded to the end face of the spindle so as to eliminate a gap which is formed between the flange portion and a spindle.