A kind of extruding die and method of corner expanding diameter by using bar material to prepare pipe

Abstract

The invention discloses a corner diameter expanding extrusion die and method for preparing a tubular product by adopting a bar and belongs to the technical field of metal plastic working. The corner diameter expanding extrusion die comprises an upper mold plate, an extrusion core rod, an upper base plate, a core rod fixing plate, an unloading plate, a concave mold, a concave mold supporting plate,a spring, a convex mold supporting plate, a lower base plate, a lower mold plate, an inner guide pillar and an extrusion convex mold. The mold adopts the floating convex mold, and the front end of the extrusion core rod is of a cone-shaped structure, so that a material flows favorably and the extrusion force is reduced; axial extrusion, secondary corner extrusion and diameter expanding extrusiondeformation of the tubular product can be achieved by means of an extrusion channel formed by the extrusion core rod and the concave mold. The mold can achieve extruding, unloading and ejecting operations of the tubular product sequentially in one stroke, so that the extrusion die is high in production efficiency and suitable for batch preparation of superfine crystal tubular products, and can achieve industrial applications of a severe plastic deformation technique.

Description

technical field [0001] The invention relates to the technical field of metal plastic processing, in particular to a corner-diameter-expanding extrusion die and method for preparing pipes by using bars. Background technique [0002] Microstructure ultra-refining is an effective means to improve the comprehensive performance of materials and fully tap the potential of materials. The demand for high-performance pipes in industrial production is increasing. How to realize the ultra-fine grain structure of pipe components and prepare high-performance pipes with ultra-fine grain structure is an important issue in the field of metal plastic processing. Severe plastic deformation (SPD) is an important method to achieve ultra-fine microstructure. In recent years, the research on the preparation of ultra-fine grains by severe plastic deformation has gradually shifted from rods and plates to pipes, and various methods for ultra-fine microstructures of pipes have been proposed. Such as...

AI Technical Summary

Problems solved by technology

However, because the upper end surface of the mandrel is flat, the bar is extruded in the radial direction first, and then flows along the extrusion direction through a corner, so that the mandrel does not have a good shunt effect on the extrusion of the bar, and the effect is on the convex The load on the mold is relatively large, which brings greater challenges to mold material selection and use safety

In addition, as a new and promising method for preparing pipes, there are still problems such as inconvenient removal of parts, which limits its application in batch preparation of pipes with ultra-fine grains. Molds and methods for mass production of ultra-fine crystal tubes that are low in cost and can use existing equipment are of great value

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