SU122126A1 - Method for stamping shaped parts of complex shape from tubular blanks - Google Patents

Description

A known method of stamping shaped parts of complex shape from tubular blanks using electrocontact heating of the blanks with parts of a stamp.

The described method, in contrast to the known method, makes it possible to manufacture complex asymmetrical shaped parts of considerable length. For this, the cold pipe billet is gradually pressed onto successively moving the slider onto a punch located under it and heated to hot deformation temperature, having a shape that corresponds to the shape of the finished part. For the manufacture of hollow parts with a thickened bottom, one end of the pipe is rolled.

FIG. 1 shows the profiles of hollow shaped parts made from tubular blanks, which can be most rationally produced using the described method. Group / consists of parts with one open end, expanding in one direction; group // - parts with two open ends, expanding in one direction; the group /// - parts with two open ends, expanding in two directions.

Parts, for example, groups / were previously made from a sheet by stretching and molding or by turning-pressing operations in 10-15 steps. The manufacture of such thin-walled hollow axisymmetric and asymmetric parts with the bottom of the tube blanks using the described method is performed in 3-5 operations. In the process, the cold pipe billet, when heated in the deformation zone, becomes plastic and, when handed out, fits the punch and copies its shape. A prerequisite for the implementation of the method is to ensure the removal of parts from the punch. The method can be carried out using, for example, the stamp depicted in FIG. 2. Contact No. 122126-2 -

Warming occurs only in the process of deformation in contact with the workpiece / part by a hot punch 2, heated by electric heating element 3 to a certain temperature depending on the material of the workpiece. The temperature of the punch is controlled by a thermocouple 4 connected to a thermostat. Only the warp zone is heated. The undeformed part of the preform is cooled by contact with the internal plunger 5 with internal cooling. The coolant is supplied through pipe 6, and discharged through pipe 7. The positions 5 and 9 mark the insulating lining. The use of simultaneous heating of the workpiece / in the deformation and cooling zone in the non-deformed zone increases the distribution coefficient, dramatically increases the ductility in the deformation zone and at the same time increases the strength of the workpiece in the non-deformed part. The combination of these two thermal effects on the workpiece makes it possible to apply the punching distribution operation to thin-walled elongated parts to which this operation in a cold state is inapplicable due to the destruction of the workpiece or loss of stability.

Constant pressing of the workpiece onto the punch (by successive movements of the press ram) must correspond to the speed of heat propagation through the workpiece so that the workpiece is heated in the deformation zone and does not have time to warm up in the undeformed part (to avoid loss of stability). The method is most suitable for the manufacture of thin-walled parts of heat-conducting metals and alloys (aluminum, brass, copper, etc.).

Subject invention

Claims (2)

1. Method of stamping shaped parts of complex shape from billet using electric contact heating of the billet with parts of a punch, characterized in that, in order to enable the manufacture of complex asymmetrical shaped parts of considerable length, the cold billet is sequentially pressed onto the one located under it and a punch heated to hot deformation temperature, having a shape corresponding to the shape of the finished part. 2. Acceptance of the method according to claim 1, characterized in that for the manufacture of hollow parts with a thickened bottom, one end of the pipe is pre-rolled. Axesappetrichnye I Dymmetrical jJV