Continuous Upsetting Billet Making Method of Magnesium Alloy Cast Rod with Large Size and High Height-to-Diameter Ratio

Abstract

The invention discloses a method for continuously upsetting a magnesium alloy cast rod with a large size and a large height-diameter ratio. ⑤The punch moves downward to extrude the billet into the second lower cavity completely. ⑥Remove the upper die first, then the T-shaped ejector rod goes up, pushes the vertical rod to protrude upward from the vertical groove and ejects the inner die until the inner die When the ring groove of the concave die is exposed to the outer die, snap the snap ring into the ring groove, ⑦The ejector rod is lowered and reset to drive the vertical rod to shrink and reset, the punch goes up and leaves the blank, and the punch collar is set on the lower part of the punch, ⑧The punch Go down and enter the second lower cavity to extrude the bottom of the billet to gradually fill the first lower cavity, and the billet in the first lower cavity begins to push out of the inner die upwards, and at the same time, the bottom billet continues to fill the first lower cavity. After leveling, the punch stops descending. The invention cleverly utilizes the ejector mechanism to change the structure of the cavity, so that the shape is fuller, the stability is stronger, and the material is saved.

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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