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1. (WO2009139377) TWIST DRILL BIT
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2009/139377    International Application No.:    PCT/JP2009/058829
Publication Date: 19.11.2009 International Filing Date: 12.05.2009
B23B 51/00 (2006.01)
Applicants: SUMITOMO ELECTRIC HARDMETAL CORP. [JP/JP]; 1-1, Koyakita 1-chome, Itami-shi, Hyogo 6640016 (JP) (For All Designated States Except US).
NAKAMURA Naohiro [JP/JP]; (JP) (For US Only).
ABE Makoto [JP/JP]; (JP) (For US Only)
Inventors: NAKAMURA Naohiro; (JP).
ABE Makoto; (JP)
Agent: KAMADA Bunji; (JP)
Priority Data:
2008-128417 15.05.2008 JP
(JA) ツイストドリル
Abstract: front page image
(EN)Disclosed is a double‑angled twist drill bit with which the finish quality is increased, without increasing the manufacturing effort. A secondary cutting edge (4b) is set nearly parallel to the rotational axis (O) of the drill bit, and at least the cutting face (10) of the cutting edge is constructed with a fluted surface with a helical flute (6). By concavely curving the fluted surface located along the leading edge (9) of the helical flute relative to the forward direction of rotation of the drill bit, a secondary cutting edge (4b) can be constructed with a minimal angle of offset from the rotational axis at the ridge line located at the intersection between the fluted surface and the flank of the clearance face.
(FR)La présente invention concerne un foret à double angulation donnant un meilleur fini sans en compliquer la fabrication. En l'occurrence, le foret comporte un bord de coupe secondaire (4b) presque parallèle à son axe de rotation (O) et la face de coupe (10) du bord de coupe présente une surface cannelée à goujure hélicoïdale (6) inhérente à sa construction. Une incurvation concave de la surface cannelée située le long du bord d'attaque (9) de la goujure hélicoïdale par rapport au sens positif de rotation du foret permet de réaliser un bord de coupe secondaire (4b) affecté d'un angle de décalage minimal par rapport à l'axe de rotation au niveau de la ligne crête correspondant à l'intersection entre la surface cannelée et le flanc de la face en dépouille.
(JA) 製造の手間などを増加させずに加工品位を高めたダブルアングル型ツイストドリルを提供する。二次切れ刃4bを、ドリルの回転軸Oとほぼ平行にし、少なくともその二次切れ刃のすくい面10をねじれ溝6の溝面で構成した。ねじれ溝のリーディングエッジ9に沿う位置の溝面をドリルの正転方向に対して凹形に湾曲させることで、その溝面と二番逃げの逃げ面とが交差した位置の稜線で回転軸とのずれ角が小さい二次切れ刃4bを構成することができる。
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)