EP 0045948 A1 19820217 - Use of a toggle drive for a press.
Title (en)
Use of a toggle drive for a press.
Title (de)
Verwendung eines Kniegelenkantriebes für eine Presse.
Title (fr)
Utilisation d'une commande à genouillère pour une presse.
Publication
Application
Priority
DE 3029999 A 19800808
Abstract (en)
1. Use of a knee action drive of a plunger (15) guided in the frame of a press for different successively executed working steps such as cutting, stamping and shaping sheet metal and sheet metal parts in forging and shaping presses with utilisation of the two strokes produced during each revolution of the crank for two movements of the tool onto a workpiece, having a first bar (11) rotatably supported in the press frame (at 10), a second bar (13) rotatably supported on the plunger (15), a connecting rod (17) rotatably connected to the common pin-joint (12) of the two bars (11, 13) and a drive crank (18), on which the end of the connecting rod (17) remote from the pin-joint (12) is rotatably supported, wherein the bars (11, 13), during each revolution of the drive crank (18) along the crank circle (20), arrive twice at the extended position (24) and arrive once each at the two fully deflected end positions providing the upper dead centres (OT1, OT2) of the plunger (15), wherein the workpiece is shaped during the movement of the bars (11, 13) from a first fully deflected end position into the extended position (24) and is burnished during the movement of the bars (11, 13) from the second fully deflected end position into the extended position (24) reached in this way in the opposite movement of the bars (11, 13), wherein the positions (18', 18") of the drive crank (18) associated with the positions (17', 17") of the connecting rod (17) characterised by the extended positions (24) of the bars (11, 13) form a central angle (25) in the circular segment of the crank circle (20) remote from the bars (11, 13), which central angle is less than 180 angular degrees and hence provides a longer time for workpiece changing between the working strokes, and wherein the circular segments (22, UT1, 19 and 23, UT2, 19) traversed by the drive crank (18) in the peripheral direction of the drive crank (18) before the lower dead centres (UT1, UT2), ending with the bottom dead centres (UT1, UT2) and representing the nominal force paths (SN ) are, at least approximately, equally large.
Abstract (de)
Die Erfindung betrifft einen Kniegelenkantrieb zur bevorzugten Anwendung bei Schmiede-bzw. Umformprägepressen. Der erfindungsgemäße Kniegelenkantrieb erlaubt bei einer Kurbelwellenumdrehung ein zweimaliges Durchlaufen der Strecklage (24) der Stelzen (11, 13), wobei die Strecklagenpunkte nahe zueinander angeordnet, durch einen geringen Hub voneinander getrennt und die Nennkraftwege gleich groß sind und mit nahezu gleicher Stößelgeschwindigkeit durchlaufen werden.
IPC 1-7
IPC 8 full level
B30B 1/14 (2006.01)
CPC (source: EP)
B30B 1/14 (2013.01)
Citation (search report)
- DE 848141 C 19520901 - SVETSMEKANO AB
- DE 1527037 A1 19690508 - PRESSEN UND SCHERENBAU ERFURT
- DE 157536 C
- DE 1153251 B 19630822 - GIESSEREI & MASCHINENFABRIK OS
Designated contracting state (EPC)
BE DE FR GB IT
DOCDB simple family (publication)
EP 0045948 A1 19820217; EP 0045948 B1 19850306; DE 3029999 A1 19820318; DE 3169181 D1 19850411; IT 1137833 B 19860910; IT 8123422 A0 19810806
DOCDB simple family (application)
EP 81106163 A 19810806; DE 3029999 A 19800808; DE 3169181 T 19810806; IT 2342281 A 19810806