Manufacturing process of asymmetric seamless hollow profile

Abstract

The invention relates to a manufacturing process of an asymmetric seamless hollow profile. The manufacturing process comprises the following steps: a, prefabricating an extrusion die, adopting the dual-hole design that a balancing rod extrusion hole and a profile extrusion hole are formed in a squeezing die, and arranging an extrusion hole forming pin in the inner chamber of an extrusion shaft; b, performing center adjustment of the extrusion die, and conducting matching adjustment of the extrusion hole forming pin and the center of the squeezing die; c, preheating the extrusion die; d, preheating an ingot; e, charging the ingot into the extrusion die for extrusion molding to obtain an aluminium alloy profile and a round bar which serves as a balancing rod; f, performing on-line quenching; g, performing on-line stretching, straightening and finishing; and h, performing artificial ageing treatment. The manufacturing process is suitable for producing the 6A02 aluminium alloy seamless non-centrosymmetric specially-shaped hollow profile on a 75 MN large-scale extruder and solves the problems of non-uniform metal flow rate, eccentricity, high probabilities of surface scratching and peeling and the like, which are caused by large difference between the wall thicknesses on two sides of the profile.

Description

technical field [0001] The invention belongs to the field of extrusion technology of aluminum alloy profiles, in particular to an asymmetric seamless hollow profile manufacturing process. Background technique [0002] Aluminum alloy profile extrusion technology is increasingly showing its important position in industrial fields such as automobiles, ships, railways, aviation, and aerospace, as well as civil fields such as construction. Aluminum alloy profiles are being widely used in the manufacturing industry, especially large hollow profiles, because of their light weight, high strength, high rigidity, and compact structure, they have become indispensable structural materials in national defense and industry. At present, the extrusion technology of aluminum alloy profiles is developing rapidly in the world. The developed countries in the world have equipped aluminum extrusion machines of various forms, structures and tonnages. Aluminum extrusions are becoming larger, more c...

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Problems solved by technology

Previously, this profile could only provide seamed products. However, the profile with seams has the risk of cracking under bending, vibration, pressure, etc., and is not the best equipment part under pressure. Seamed hollow profiles will have more stable and reliable resistance to external forces, and have more market prospects in terms of safety. However, the production of center asymmetric seamless hollow profiles is still in its infancy in China, and no company can provide seamless centers in batches. Asymmetric Hollow Profiles

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