EP 0189447 B1 19880427 - FORGING PROCESS
Title (en)
FORGING PROCESS
Publication
Application
Priority
DE 3427156 A 19840724
Abstract (en)
[origin: WO8600838A1] A process for producing a synchronous component possessing short gear-teeth, with undercut teeth for a gear system, by means of precise forging in which the teeth, which are placed with their radial inner side against a common cylindrical surface and with their base on a common lower plane are first made with tooth flanks which are parallel and then undergo a finishing upsetting operation, this process making it possible to achieve a particularly precise shape of the engagement surfaces, whereby the following stages of the process are important: a) a semi-finished product is produced by preliminary forging, the short-toothed gearing of which possesses teeth (7) having a dimension which exceeds the finished dimension of the tops of the teeth (10); b) by one or several successive calibrating passes the cold semi-finished product is formed in such a way that i) first, the tops of the teeth (10) are upset, whereby the teeth are supported on their radial external sides on the forging side; ii) simultaneously with preliminary upsetting or by means of a further calibration pass by rounding off of the tooth flanks (9) to the lower plane (5), a cold reinforcement is produced in the corresponding bases of the teeth (7) and iii) when the finishing upsetting operation is performed, the tops of the teeth are each shaped in the form of a roof and the tooth flanks receive an oblique setting corresponding to their undercutting.
IPC 1-7
IPC 8 full level
F16H 3/12 (2006.01); B21J 5/12 (2006.01); B21K 1/30 (2006.01); F16D 23/06 (2006.01)
CPC (source: EP US)
B21J 5/12 (2013.01 - EP US); B21K 1/30 (2013.01 - EP US); Y10T 29/49474 (2015.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 8600838 A1 19860213; BR 8506856 A 19860923; CA 1249458 A 19890131; CS 259530 B2 19881014; DE 3427156 A1 19860206; DE 3427156 C2 19860717; DE 3562319 D1 19880601; EP 0189447 A1 19860806; EP 0189447 B1 19880427; ES 545490 A0 19861216; ES 8701549 A1 19861216; HU 198139 B 19890828; HU T43798 A 19871228; IL 75883 A0 19851231; IL 75883 A 19871020; IN 164593 B 19890415; JP H035251 B2 19910125; JP S61502736 A 19861127; US 4700446 A 19871020; YU 121085 A 19880430; YU 45265 B 19920528; ZA 855513 B 19860326
DOCDB simple family (application)
EP 8500335 W 19850708; BR 8506856 A 19850708; CA 487439 A 19850724; CS 546485 A 19850724; DE 3427156 A 19840724; DE 3562319 T 19850708; EP 85903281 A 19850708; ES 545490 A 19850723; HU 361085 A 19850708; IL 7588385 A 19850723; IN 539CA1985 A 19850719; JP 50315485 A 19850708; US 85774486 A 19860320; YU 121085 A 19850723; ZA 855513 A 19850722