Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1979-09-19
1982-06-01
Larson, Lowell A.
Metal deforming
By extruding through orifice
Utilizing internal forming means
72272, 72261, 291574, B21C 2314, B21C 2700, B21C 2308
Patent
active
043321569
ABSTRACT:
The invention is related to the integral extrusion of at least two pipes and a common flange to an extruding device and to a flange with at least two pipes integral with said flange. The method is characterized in that said pipes are extruded simultaneously while a common flange is formed at the same time, during which extrusion the material of the starting workpiece (blank), flowing under pressure, is forced, at a certain distance before the beginning of the extrusion openings for the pipes, to flow axially and radially into and through a transient space situated between said openings and the space reserved for the flange. By this method a flange is obtained integral with at least two pipes of equal cross-sections and wall thickness along their whole length said method is carried out by a device comprising an extruding device with a reciprocating plunger in the extrusion space, said extrusion space being closed off, at the side facing the plunger, by an extrusion plate provided with the required number of extrusion openings, a preferably stationary mandrel extending through each of these openings, said device being characterized by a member which can be placed in the extrusion space between the extrusion plate and the starting workpiece (blank), said member limiting the transient space and forming a gap together with the outwardly directed side of each mandrel.
REFERENCES:
patent: 1395217 (1921-10-01), Begot
patent: 2894623 (1959-07-01), Walton
patent: 3347079 (1967-10-01), Rowell
patent: 3355927 (1967-12-01), Sibler
patent: 3527079 (1970-09-01), Braeuninger
patent: 3668757 (1972-06-01), Rieder
patent: 3786665 (1974-01-01), Creuzet
patent: 3948079 (1976-04-01), Fuchs, Jr.
patent: 4050279 (1977-09-01), Fuchs, Jr.
B. V. Koninklijke Maatschappij "de Schelde"
Larson Lowell A.
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