Extrusion forming mould for annular ribs of magnesium alloy shell parts

Abstract

The invention discloses an extrusion forming mould for annular ribs of magnesium alloy shell parts. The extrusion forming mould mainly comprises an upper mould plate, a mandrel, a split male mould pull rod, split male moulds, tension springs, a male mould sliding guide rail, a split male mould sliding bottom plate, a supporting plate and a cylindrical female mould, wherein the head part of the mandrel is conical, a center hole is formed in the axial direction of the mandrel, one end of the split male mould pull rod is inserted in the center hole, the other end of the split male mould pull rod is fixed on the split male mould sliding bottom plate, the at least two split male moulds are symmetrically arranged around the split male mould pull rod, are fixedly connected with the split male mould pull rod through the tension springs and are arranged in a radial sliding groove of the split male mould sliding bottom plate through the male mould sliding guide rail, a wedge-shaped inclined plane adapting to the conical head part of the mandrel is arranged at the inner side of each split male mould, an arc-shaped extruding bulge is arranged at the arc-shaped wall surface of the outer side of each split male mould, and the arc length of each extruding bulge is more than the distance between each two adjacent extruding bulges. According to the extrusion forming mould, all the split male moulds do radial movement by virtue of the axial movement of the mandrel, metal flows in the radial direction, and thus the annular ribs are generated.

Description

technical field [0001] The invention relates to the technical field of metal material plastic processing and forming, in particular to an extrusion forming die for ring ribs of magnesium alloy shell parts. Background technique [0002] The density of magnesium alloy is only 1.7g / cm 3 (The specific gravity is about a quarter of that of steel), and it is currently the lightest metal structural material. In addition, from the perspective of engineering applications, magnesium alloys have high specific strength and specific stiffness, and excellent damping and shock absorption properties. and electromagnetic shielding properties, making it a future-oriented and environmentally friendly practical structural material. [0003] However, the crystal structure of magnesium alloys is a hexagonal close-packed structure, with few slip surfaces, and it is difficult to plastically deform at room temperature, which has become the main reason hindering the development and application of de...

AI Technical Summary

Problems solved by technology

However, the quality of the formed ring bars often cannot meet the requirements, and the bars are often not filled enough

Especially for magnesium alloy materials with low plastic formability, it is easy to have defects such as cracks, ripples, accumulation, fracture, etc.

The existing spinning process is not very adaptable to magnesium alloys

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