(19)
(11) EP 1 611 983 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
10.05.2006 Bulletin 2006/19

(43) Date of publication:
04.01.2006 Bulletin 2006/01

(21) Application number: 04716346.4

(22) Date of filing: 02.03.2004
(51) International Patent Classification (IPC): 
B23G 5/06(1968.09)
(86) International application number:
PCT/JP2004/002543
(87) International publication number:
WO 2004/080637 (23.09.2004 Gazette 2004/39)
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 14.03.2003 JP 2003070488

(71) Applicants:
  • Yamawa Mfg. Co., Ltd.
    Chuo-ku Tokyo 104-0031 (JP)
  • Kennametal, Inc.
    Latrobe, PA 15650-0231 (US)

(72) Inventors:
  • AKAKI, S., Yamawa Mfg. Co., Ltd.
    Tokyo 1040031 (JP)
  • MITSUI, M., Yamawa Mfg. Co., Ltd.
    Tokyo 1040031 (JP)
  • HENDERER, Willard E.
    Evans, GA 30809 (US)

(74) Representative: Paget, Hugh Charles Edward et al
Mewburn Ellis LLP York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)

   


(54) HIGH-SPEED PROCESSING TAP


(57) A high-speed forming tap (1) for cutting and forming a female screw by cutting edges (E) of a screw portion (2) fed in synchronous with the rotation of a machine tool. The high-speed forming tap is characterized in that chamfers (CF) are provided at a bevel lead (2a) of the screw part (2). The chamfers (CF) start from the cutting edge (E) and are provided along ridgelines (R) between a crest face (2e) and flanks, or a following flank (2c) and a leading flank (2d). This structure enables the shape of the edges of the tap leading portion to be stably maintained and high-speed, smooth female screw cutting with high accuracy, and provides a tap with long life.