Global Patent Index - EP 0224782 A3

EP 0224782 A3 19890322 - METHOD AND APPARATUS FOR FREE FORGING OF WORK PIECES

Title (en)

METHOD AND APPARATUS FOR FREE FORGING OF WORK PIECES

Publication

EP 0224782 A3 19890322 (DE)

Application

EP 86115908 A 19861115

Priority

DE 3542966 A 19851205

Abstract (en)

[origin: US4788842A] The invention relates to a method and apparatus for open-die forging of workpieces in forging presses at high forging temperatures, more particularly steel billets or ferrous alloy billets between about 800 and 1250 degrees Celsius. In conventional open-die forging it is often not possible to complete the forging process in a single heat, and the workpiece must therefore be reheated. Also, with direct contact between workpiece and tool, cracks occur, particularly in the vicinity of bulges, the prevention or straightening of which requires repeated transverse hammer- or pressure-forging, so lengthening the cooling time. The total energy consumption for deformation and heating of the workpieces is therefore relatively high. Reduction of this energy consumption, a surprising improvement in product quality, and almost complete elimination of bulges are achieved by means of the invention, in that during forging the workpiece undergoes lubrication effective at the forging temperature, the lubricant being a fluid glass film. The lubricant is advantageously applied in the form of a fine powder.

IPC 1-7

B21J 3/00

IPC 8 full level

B21J 3/00 (2006.01); C10M 103/06 (2006.01)

CPC (source: EP US)

B21J 3/00 (2013.01 - EP US); C10M 103/06 (2013.01 - EP US); C10M 2201/12 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT DE ES FR GB IT SE

DOCDB simple family (publication)

EP 0224782 A2 19870610; EP 0224782 A3 19890322; DE 3542966 A1 19870611; JP S62134129 A 19870617; US 4788842 A 19881206

DOCDB simple family (application)

EP 86115908 A 19861115; DE 3542966 A 19851205; JP 28609686 A 19861202; US 93823886 A 19861205