Self-rotating forward extrusion forming die and method

Abstract

The invention discloses a self-rotating forward extrusion forming die and a method. The self-rotating forward extrusion forming die comprises a first fixing assembly, a male die body, a female die body, an extrusion die body, a thrust ball bearing, a second fixing assembly and a fixing sleeve; the first fixing assembly comprises an upper die plate, an upper base plate and a fixing plate, and after the male die body is placed in the center of the fixing plate, and the upper base plate and the upper die plate are positioned through positioning pins, and fixedly connected through hexagon socket bolts; and the extrusion die mold is arranged below the female die body and fixedly connected with the female die body through pins, the thrust ball bearing is fixedly assembled between the extrusion die body and the lower base plate through a middle ring, and the middle ring is fixedly connected with the lower base plate. According to the self-rotating forward extrusion forming die, self-rotation of the female die body and the extrusion die body is achieved through die structure design without driving of a motor; and a blank is violently twisted and deformed in a rotating die body, so that the forming load is reduced, structure refining and performance improving are facilitated, and a high-performance profile is prepared.

Description

technical field [0001] The invention relates to the technical field of plastic forming of metal materials, in particular to a self-rotating forward extrusion forming die and method. Background technique [0002] Positive extrusion is a common technology for preparing profiles, which has the advantages of simple operation, simple equipment, and flexible production. However, during the forward extrusion process, relative movement occurs between the billet and the die, and the frictional resistance is large (accounting for 30-40% of the total energy consumption), which increases the extrusion force and energy consumption. The strong friction and heating effect also limits the increase of the extrusion speed of aluminum alloys, magnesium alloys and other low-melting point alloys, so that the temperature of the head of the extruded profile is low, the temperature of the tail is high, the metal flow is uneven, and the flow velocity in the center is faster than that in the edge. T...

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Problems solved by technology

[0006] The billet rotary extrusion forming method mentioned in the above-mentioned patent documents and articles can realize the torsion deformation of the billet during extrusion forming, but the process of setting spiral steps in the mold increases the difficulty and precision of mold processing, and the billet is still There is relative movement with the die, the plastic fluidity of the billet is poor, the die is prone to damage, and the extrusion forming load is high; the process of driving the die to rotate through the motor requires design and modification of the forming die and equipment, which is complicated and expensive.

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