Method and device for forming solid particle medium of aluminum-coated magnesium composite pipe

Abstract

The invention discloses a method and device for forming a solid particle medium of an aluminum-coated magnesium composite pipe. A mold sleeve and a mold core are arranged on a workbench, and a thermocouple is arranged in the mold core. A mold cavity is formed in the mold core. An upper gland is arranged at the top of a mold, and a lower gland is arranged at the bottom of the mold. Through holes are formed in the center of the upper gland and the center of the lower gland. An upper puncher pin is arranged in the through hole of the upper gland, and a lower puncher pin movably penetrates into the through hole of the lower gland. The upper puncher pin and the lower puncher pin are both connected with a hydraulic system. Water-cooled pipes are arranged in the upper gland and the lower gland, and an induction heating coil is arranged on the outer ring of the mold. A magnesium alloy and an aluminum alloy are firstly overlaid, the solid particle medium is adopted for pull expanding forming, and the aluminum-coated magnesium alloy component continuous in structure, high in layer interface strength and good in corrosion resistance is finally obtained by controlling the forming and connecting temperature, time and pressure. According to the method and device, the former procedure of composite plate preparation is omitted, cost is reduced, and efficiency is improved; and meanwhile, interface layer damage caused by composite plate expanding forming is avoided.

Description

technical field [0001] The invention discloses a method and a device for forming a solid particle medium of an aluminum-clad magnesium composite pipe fitting, and belongs to the technical field of composite pipe forming. Background technique [0002] The poor corrosion resistance of magnesium and magnesium alloys is one of the main factors limiting their wide application. In order to improve its corrosion resistance, it can be modified on the surface. Commonly used methods include chemical conversion coating, anodic oxidation, vapor deposition, laser cladding, thermal spraying, etc. However, these methods require special equipment, and the process is complicated and the production cost is relatively high. In contrast, aluminum and aluminum alloys usually have better corrosion resistance and plastic formability, and have good surface repairability and modification. Therefore, coating a layer of aluminum alloy with good corrosion resistance on the surface of magnesium alloy ...

AI Technical Summary

Problems solved by technology

These three methods can successfully produce aluminum alloy-coated magnesium alloy composite pipes, but hard and brittle intermetallic compounds will be formed at the interface, which will reduce the formability of the composite pipe during subsequent processing and easily cause interlayer cracking.

Therefore, the process of preparing the composite plate first and then forming the pipe parts is not only complicated, but also has large energy consumption, low production efficiency, high production cost, and the layer interface of the formed multi-layer structure is severely cracked, and the quality of the parts is not high.

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