Magnesium Alloy Cast Rod Continuous Upsetting Blank Die

Abstract

The invention discloses a mold for continuous upsetting of magnesium alloy cast rods, which comprises a punch, a ring of the punch, an upper die, a lower die, a snap ring and an ejector mechanism; the upper die is coaxially installed above the lower die, The upper die is equipped with an upper cavity for the punch to cooperate with; the lower die includes an inner die and an outer die, and the outer die is provided with a first lower cavity for the inner die to be nested. The outer wall of the inner die There is a ring groove for the snap ring to snap into. The outer diameter of the snap ring is larger than the outer diameter of the inner die, and the second lower cavity with a diameter larger than the upper die cavity is set in the inner die; On the outside of the mold, the punch after socketing can cooperate with the second lower cavity; the ejector mechanism includes a top plate, a vertical rod and a T-shaped ejector rod. The top plate is supported under the first lower cavity, and the top plate is in the corresponding inner cavity. A vertical slot is set at the position for the vertical rod to expand and contract up and down, and the lower end of the vertical rod is connected to the T-shaped ejector rod. In this case, the ejector rod mechanism is used to move and change the cavity structure, so as to realize continuous upsetting and large plastic deformation of fuller large-scale cast rods.

Description

technical field [0001] The invention belongs to the metal extrusion forming technology, and is suitable for continuous large-deformation billet making of magnesium alloy cast rods with a large aspect ratio far greater than 3. Background technique [0002] Continuous upsetting deformation means that during the upsetting deformation process of cast rods (hereinafter referred to as bars or billets), different working sections are continuously changed by changing different punches, dies, etc. strain, so as to achieve the purpose of grain refinement, the principle diagram is as follows figure 1 shown. The first step: place the D1×H1 blank in the first set of molds for the first upsetting forming, and the size of the blank after completion is D2×H2; the second step: place the D2×H2 blank in the second set of molds The second upsetting process is carried out, and the size of the blank after completion is D3×H3 (upsetting can be continued to obtain the desired blank size), so far,...

AI Technical Summary

Problems solved by technology

In particular, when the aspect ratio is greater than 3, the cylindrical blank will experience instability, resulting in "double drums" and folding defects, making subsequent deformation impossible.

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