| US 7,468,001 B2 | ||
| High-speed forming tap | ||
| Sadayuki Akaki, Tokyo (Japan); Masao Mitsui, Tokyo (Japan); and Willard E. Henderer, Evans, Ga. (US) | ||
| Assigned to Yamawa Mfg. Co., Ltd., Tokyo (Japan); and Kennametal Inc., Latrobe, Pa. (US) | ||
| Appl. No. 10/549,452 PCT Filed Mar. 02, 2004, PCT No. PCT/JP2004/002543 § 371(c)(1), (2), (4) Date Jan. 26, 2006, PCT Pub. No. WO2004/080637, PCT Pub. Date Sep. 23, 2004. |
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| Claims priority of application No. 2003-070488 (JP), filed on Mar. 14, 2003. | ||
| Prior Publication US 2006/0127193 A1, Jun. 15, 2006 | ||
| Int. Cl. B21H 3/02 (2006.01) | ||
| U.S. Cl. 470—198 [408/220] | 13 Claims |
| 1. A high-speed forming tap which is fed forward by a machine tool in synchronization with rotation to cut and form a female
screw by a cutting edge of a screw part,
wherein the screw part includes a bevel lead having chamfers provided from the cutting edge along ridgelines between a crest
face and a following flank of a thread, and between the crest face and a leading flank of the thread, a width of each of the
chamfers decreases with distance from the cutting edge.
|