EP 0085888 A3 19840328 - METHOD OF MAKING IN A METAL PIECE A THOROUGHFARE HOLE HAVING EDGE-REINFORCEMENTS ON BOTH ENDS, AND ALSO TOOL AND APPARATUS FOR CARRYING OUT THE METHOD
Title (en)
METHOD OF MAKING IN A METAL PIECE A THOROUGHFARE HOLE HAVING EDGE-REINFORCEMENTS ON BOTH ENDS, AND ALSO TOOL AND APPARATUS FOR CARRYING OUT THE METHOD
Publication
Application
Priority
US 34667982 A 19820208
Abstract (en)
[origin: US4428214A] A flow drilling tool including a blunt-ended prepunch portion for punching a circular slug from the workpiece as the tool is rotated and moved axially with respect to the workpiece. Thereafter, a circular forming portion is rotated in contact with the workpiece to increase the length and diameter of the punched hole. The prepunch permits formation of a rimmed hole in a single step by eliminating predrilling. Variations and irregularities in the length and thickness of the rim portion surrounding the hole are reduced, and ragged tapered surfaces on the rim portion are eliminated. The axial location of the hole relative to the workpiece is controlled by adjusting the speed of rotation of the tool and the axial pressure of the tool against the workpiece, and by preheating the workpiece.
IPC 1-7
IPC 8 full level
B21J 5/10 (2006.01); B21C 37/29 (2006.01); B21J 13/02 (2006.01)
CPC (source: EP US)
B21C 37/298 (2013.01 - EP US); B21J 5/066 (2013.01 - EP US)
Citation (search report)
- [Y] DE 7801492 U1 19780503
- [AD] US 3939683 A 19760224 - VAN GEFFEN JOHANNES ADRIANUS
- [X] DE 2536611 A1 19770224 - DAIMLER BENZ AG
- [A] DE 7801491 U1 19780615
- [A] US 4109501 A 19780829 - KOZIMA TOYOO
- [Y] WT - ZEITSCHRIFT IND. FERTIGUNG, Band 62, Heft 7, 1972, Springer-Verlag G. OEHLER "Blechdurchzüge für Gewinde", Seiten 386-388
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0085888 A2 19830817; EP 0085888 A3 19840328; EP 0085888 B1 19860723; AU 1038383 A 19830818; AU 548871 B2 19860102; BR 8300550 A 19831108; CA 1196217 A 19851105; DE 3364569 D1 19860828; DK 52183 A 19830809; DK 52183 D0 19830208; ES 519583 A0 19840301; ES 522152 A0 19840416; ES 8403053 A1 19840301; ES 8404213 A1 19840416; FI 830395 A0 19830204; FI 830395 L 19830809; JP S58145324 A 19830830; US 4428214 A 19840131; ZA 83792 B 19840926
DOCDB simple family (application)
EP 83100629 A 19830125; AU 1038383 A 19830114; BR 8300550 A 19830204; CA 417545 A 19821213; DE 3364569 T 19830125; DK 52183 A 19830208; ES 519583 A 19830207; ES 522152 A 19830506; FI 830395 A 19830204; JP 1952383 A 19830208; US 34667982 A 19820208; ZA 83792 A 19830207