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1. (WO1998050595) A METHOD FOR IMPROVING THE HEMMABILITY OF AGE-HARDENABLE ALUMINUM SHEET
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/1998/050595 International Application No.: PCT/US1998/007668
Publication Date: 12.11.1998 International Filing Date: 16.04.1998
Chapter 2 Demand Filed: 20.08.1998
IPC:
B21D 39/02 (2006.01) ,C22F 1/04 (2006.01) ,C22F 1/047 (2006.01) ,C22F 1/053 (2006.01) ,C22F 1/057 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
D
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING
39
Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
02
of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
F
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS
1
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
04
of aluminium or alloys based thereon
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
F
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS
1
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
04
of aluminium or alloys based thereon
047
of alloys with magnesium as the next major constituent
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
F
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS
1
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
04
of aluminium or alloys based thereon
053
of alloys with zinc as the next major constituent
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
F
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS
1
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
04
of aluminium or alloys based thereon
057
of alloys with copper as the next major constituent
Applicants: GENERAL MOTORS CORPORATION[US/US]; P.O. Box 33114 Detroit, MI 48232, US
Inventors: KRAJEWSKI, Paul, E.; US
RYNTZ, Edward, F.; US
Agent: GROVE, George, A.; General Motors Corporation Legal Staff P.O. Box 33114 Detroit, MI 48232, US
MANITZ FINSTERWALD & PARTNER; Robert-Koch.Strasse 1 D-80538 München, DE
Priority Data:
08/846,45301.05.1997US
Title (EN) A METHOD FOR IMPROVING THE HEMMABILITY OF AGE-HARDENABLE ALUMINUM SHEET
(FR) PROCEDE FACILITANT LE PLIAGE D'UNE FEUILLE D'ALUMINIUM DURCISSABLE PAR VIEILLISSEMENT
Abstract:
(EN) An improved method of forming a severe bend (20) or a hem in a sheet (10) of wrought aluminum age-hardened and age-hardenable alloy includes heating the region (22) to be bent or hemmed to a temperature above about 250 °C for a period of seconds and then quenching the heated region to remove the age-hardening effect and thereafter accomplishing the bend (20) or hem before age hardening of the heated region occurs.
(FR) L'invention concerne un procédé perfectionné permettant de former un repli marqué (20) ou un bord rabattu sur une feuille (10) d'aluminium corroyé durci par vieillissement et d'un alliage durcissable par vieillissement, lequel procédé consiste à chauffer la zone (22) à plier ou à rabattre à une température dépassant 250 °C environ durant quelques secondes, puis à tremper la zone chauffée de manière à éliminer l'effet de durcissement par vieillissement, et enfin à procéder à la formation du repli (20) ou du bord rabattu avant que la région chauffée ne durcisse par vieillissement.
front page image
Designated States: CA, JP, MX
European Patent Office (EPO) (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)