Method for manufacturing fracture surface changing seamless aluminium-alloy tubular product

Abstract

The invention discloses a method for manufacturing a fracture surface changing seamless aluminium-alloy tubular product, which belongs to the technical field of aluminium alloy materials. The method comprises the following steps of: producing internal thickened parts, namely fixing the front part of an extrusion pin in an extrusion die hole before starting extruding in production, thereby extruding a front-end internal thickened part under the state, and retracting the extrusion pin to ensure that a shrinking part can face to the die hole, thereby manufacturing a rear-end internal thickened part; producing a normal-size part, namely moving the extrusion pin ahead to narrow a gap between the die hole and the extrusion pin and thin a tube wall, thereby manufacturing the normal-size part on the front end of a raw material of the extruding tubular product; producing an outer thickened part, namely moving the extrusion pin ahead to enlarge the gap between the die hole and the extrusion pin so as to increase the wall thickness of the outer thickened part because the inner diameter of the part of the tubular product raw material is reduced. The method provided by the invention has the beneficial effects that the fracture surface changing seamless tubular product can be produced, one-step extrusion forming is realized, the material organization of the product in a length direction is uniform and consistent, the product quality is greatly improved, the manufacturing technique is simplified, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials. Background technique [0002] At present, aluminum alloy pipes are divided into seamed pipes and seamless pipes. The seamed pipe is formed on a single-acting extruder using a split-flow combined die, and the seamless pipe is formed on a double-acting extruder by means of perforating needles and molds. The pipes produced by these conventional processes are uniform in wall thickness and cross-section along their longitudinal length. [0003] Variable cross-section pipes are inconsistent in inner diameter or wall thickness along the length direction. At present, seamless variable-section aluminum alloy pipes are produced, and seamless aluminum alloy pipes are usually produced first, and then thickened ends are formed by piering at both ends or through The way cold working removes metal creates longitudinal wall thickness inconsistencies. The variable cross-section pipe produced b...

AI Technical Summary

Problems solved by technology

The variable cross-section pipe produced by pier thickening has a great change in the structure of the material, the process is difficult, and the quality is unstable; the variable cross-section pipe formed by removing metal by cold working is limited by the processing method, and the length can reach Too long, and the loss of material is large

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