IL41057A

IL41057A - Method and device for the precision shaping of a metal part by pressing

Info

Publication number: IL41057A
Application number: IL41057A
Authority: IL
Original assignee: Jean Baptiste Paul Vau
Priority date: 1971-12-13
Filing date: 1972-12-12
Publication date: 1976-05-31
Also published as: FR2163320B1; GB1419255A; SE389047B; FR2163320A1; BE792138A; NL7216955A; IL41057A0; DE2260742A1; DE2260742B2; US3845651A; CH561573A5; IT971800B; DE2260742C3

Claims

¥ΗΑΤ IS CLAIMED IS 8

1. Method of accurately and homogeneously shaping a metal part having a substantially constant cross sectional surface area throughout its length, from an initial blank, section or rough cut shaped or machined, by pressing same in a tool, this method being characterised in that* a) the length of the initial blank to be shaped is somewhat greater than that desired for the end product, as a function of the necessary reduction in length of the part, with substantially constant cross sectional surface areas, but with transverse dimensions (width and thickness) such that upon completion of the first step shaping operations, these last mentioned dimensions are slightly inferior, at all points* to those of the desired part; b) in a first step, the shaping operation proper is performed by applying to the part in a direction substantially perpendicular to the longitudinal axis thereof a force suf icient for shaping the part between one or two dies and one or more punches reserving therebetween a cavity capable of providing the end shape of the part to be obtained after the longitudinal elastic release thereof, the shaping stroke being limited by external stop members f c) in a second step, without relieving the rigid closing of said cavity, the part contained therein is stabilised by applying to one or either end of said part in the direction of the output axes thereof an upsetting force sufficient to cause said part to be shortened to a limited extend determined by stop means or an antagonistic force, and to cause the very slight swelling effect resulting from the application of said upsetting being relieved before or simultaneously with the cavity closing stress.

2. A device for shaping parts acoording to the method disclosed in Claim 1, characterised in that it comprises tool means consisting of one or a plurality of punches and one or a plurality of dies, and possibly laterally movable members* adapted to form therebetween a cavity having a shape consistent with the part to be obtained before its elastic expansion, said cavity being open at least one of its ends, stop members adapted to block the yuneh or punches and said lateral members in a position such that said cavity closed under stress has the shape of the desired part before its elastic expansion, and, registering with the open and or ends of said cavity, an upsetting member adapted to exert an upsetting force by engaging substantially the whole of the cross sectional surface of the ends of said part so as to reduoe the length of said part to an extent limited by a stop member or by the force applied thereto*

3. · Device acoording to claim 2, characterised in that the cavity formed between the punch or punches and the die or dies has the same length as the part to be obtained, before its elastic expansion, said movable upsetting member being adapted to abute the open end of said tool means*

4. * Device acoording to claim 2, characterised In that the cavity formed between said punch or punches and said die or dies has a greater length than that of the desired final part, and that the upsetting member is adapted to penetrate through the corresponding end of said cavity for exerting an upsetting force against the corresponding end of said part subsequent to the shaping thereof*

5. De ice according to any of claims 2 to k, characterised In that said shaping tool means are adapted to trim t¾e ends of the blank subsequent to the shaping thereof and before its stabilisation by upsetting.

6. Shaping device according to any of claims 2 to 5, characterised in that said punc means and/or die means are subdivided into a plurality of sections held initially in a spaced relationship, for example by spring means, but adapted to be subsequently put in mutual contact, 7o Method substantially as described hereinabove with reference to the accompanying drawings. 8, Shaping device substantially as described hereinabove and illustrated in the accompanying drawings.