Back pressure type cold extruding device for annular thin-wall long-neck parts

Abstract

The invention belongs to the technical field of forging equipment, and discloses a back pressure type cold extruding device for annular thin-wall long-neck parts. The back pressure type cold extrudingdevice for the annular thin-wall long-neck parts comprises a lower die structure, a back pressure structure, an upper die structure, a workpiece groove and a top structure, wherein the back pressurestructure is arranged at the upper end of the lower die structure; the upper die structure is arranged at the upper end of the back pressure structure; the workpiece groove extends into the lower diestructure from the upper end surface of the back pressure structure; the top structure is arranged at the lower end of the lower die structure; the back pressure structure comprises a fixed plate, a binder ring and a base plate; the fixed plate is arranged between the upper die structure and the upper die structure; one end of the binder ring extends into the workpiece groove and is connected withthe inner edge of the lower die structure; and the base plate is arranged between the binder ring and the upper die structure. According to the back pressure type cold extruding device for the annular thin-wall long-neck parts provided by the invention, a workblank can be ensured to be formed through one-time cold extruding , the quality of an extruded piece is improved, meanwhile, the forming pressure of the workblank and the internal stress of a mold are further reduced, and the service life of the mold is prolonged.

Description

Technical field [0001] The invention belongs to the technical field of forging equipment, and in particular relates to a back pressure cold extrusion device for ring-shaped thin-walled and long-necked parts. Background technique [0002] Cold extrusion is a processing method in which a metal blank is placed in a cold extrusion die cavity, and pressure is applied to the blank through a punch fixed on a press to plastically deform the metal blank to obtain parts. [0003] In the prior art, when the cold extrusion die stretches the metal blank, the metal blank flows slowly in the extrusion direction in the die, and the metal blank often needs one or more pressures to be formed. The stress is large, the forming pressure of the extrusion is large; at the same time, the upper end of the extrusion is relatively loose and the flatness is not high. [0004] Therefore, it is necessary to provide a new back pressure cold extrusion device for ring-shaped thin-walled and long-necked parts to sol...

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