| 摘要 |
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.
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