7xxx series aluminum alloy large-specification hollow cast ingot production device and process thereof

Abstract

The invention discloses a 7xxx series aluminum alloy large-specification hollow cast ingot production device and process. The device comprises a crystallizer, a water jacket, a core and a core support, wherein the core support is arranged above the crystallizer through an annular groove formed in the top of the crystallizer, the core support is a circular frame, and a protruding connecting opening is formed in the center of the core support; the connector is fixed to the edge of the core support through reinforcing ribs, a connecting sleeve connected with the core water inlet is arranged in the connector, the upper portion of the connecting sleeve is connected with the connector in a threaded fit mode and extends out of the connector, a lower end opening of the connecting sleeve is arranged in the core water inlet, a connecting plate matched with an end opening of the core is arranged on the outer side wall of the connecting sleeve, and a bolt hole is formed in the connecting plate. The 7xxx series aluminum alloy large-specification hollow cast ingot is prepared by smelting, refining and casting through a specific device and a bipolar uniform fire treatment process, and the formability and the structure of the cast ingot are ensured by utilizing accurate matching of process parameters.

Description

technical field [0001] The invention belongs to the technical field of vertical semi-continuous casting of aluminum alloy hollow ingots, and in particular relates to a production device for large-size hollow ingots of 7xxx series aluminum alloys and a process thereof. Background technique [0002] Modern civil aircraft are constantly developing towards large size, high speed, long life, high flight safety and low cost. The design goal of large passenger aircraft is to meet 90,000 hours, 30 calendar year life, durability damage tolerance design and anti-corrosion design, while 7xxx High-strength pipes and profiles, as important load-bearing parts of large passenger aircraft structures, put forward high requirements for the strength, corrosion resistance, damage tolerance and comprehensive performance of materials, and the control of ingot structure for extrusion production is even more important. It is the key to ensure that all pipes and profiles meet the requirements. [0...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a production device for large-scale hollow ingots of 7xxx series aluminum alloys. Another object of the present invention is to provide a process for producing large-scale hollow ingots of 7xxx series aluminum alloys using the above-mentioned device to solve the existing problems. The 7xxx series aluminum alloy large-scale hollow ingots in the technology have low controllability and poor formability, and are prone to formability problems such as ring cracks, radial cracks, and through-heart cracks.

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