Process method for eliminating aluminum skimmings on surface of continuously extruded aluminum alloy flat tube

Abstract

The invention relates to a process method for eliminating aluminum skimmings on the surface of a continuously extruded aluminum alloy flat tube. The process method comprises the following steps that aluminum alloy components are optimized, so that aluminum alloy components comprise 0.09-0.12% of Cu, 0.03-0.05% of Si, 0.12-0.17% of Fe, the ratio of Fe to Si is greater than or equal to 3, 0.006-0.0075% of Ti, 0.045-0.055% of Ce and La mixed rare earth and the balance A so as to improve the casting performance and the structure uniformity of an aluminum rod; and meanwhile, a refining process of adding rare earth in a furnace and adding aluminum-titanium-boron wires on line is combined, so that the looseness of the aluminum rod is ensured to reach grade 1. Ultrahigh-speed online homogenizing heat treatment is adopted, so that chemical components of the aluminum rod are homogenized within an extremely short time, and intragranular segregation is eliminated. While the fluidity of metal is improved, extrusion process parameters are optimized, a mold cooling process is changed, it is guaranteed that the extrusion temperature fluctuation is within the minimum range, and constant-temperature extrusion is achieved; and after a product is formed, the surface of the flat tube is subjected to online treatment, and finally the technical purposes of eliminating aluminum skimmings on the surface of the aluminum flat tube, reducing indentation defects and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy product processing, in particular to a process method for eliminating aluminum scraps on the surface of continuously extruded aluminum alloy flat tubes. Background technique [0002] The traditional aluminum alloy flat tube production process of aluminum alloy flat tube is: the raw material aluminum rod for production of flat tube (smelting with aluminum ingot or aluminum water ingredients, degassing and slag removal, casting and rolling into aluminum rod)→cleaning the surface of aluminum rod→extruding Mold assembly→continuous extrusion→online water cooling→online air drying→tension adjustment→coiling→semi-finished product inspection→air leak water inspection→cutting, cutting to length, finished product inspection, packaging and storage. Among them, the alloy formula of the common aluminum alloy flat tube is Cu: 0.05-0.15%, Si: 0.08-0.12%, Fe: 0.15-0.20%, and the balance is Al and unavoidab...

AI Technical Summary

Problems solved by technology

Aluminum chips or aluminum particles on the surface of the flat tube adhere to the surface of the flat tube. During the subsequent blanking and sizing process, aluminum chip pitting defects are formed on the surface of the flat tube, and the scrap amount accounts for about 30% of the total scrap. Seriously affect the flat tube yield

Secondly, some flat tube products with aluminum chips on the surface are easy to miss inspection and flow into customers, resulting in user complaints and quality claims

These aluminum chips or particles also affect the coating of anti-corrosion coatings on the aluminum alloy surface, and the pitting defects caused by aluminum chips can easily cause corrosion and leakage of flat tubes, affecting the service life