Electro-plastic multi-directional forging method and device for spray-formed aluminum alloy

Abstract

The invention discloses an electro-plastic multi-directional forging method and device for a spray-formed aluminum alloy. The electro-plastic multi-directional forging method comprises the steps thata spray-formed aluminum alloy blank is cut into an aluminum alloy ingot blank which is in a cuboid shape; sleeving processing is performed on the cut aluminum alloy ingot blank, and the whole aluminumalloy ingot blank is tightly wrapped with a steel plate; the sleeved aluminum alloy ingot blank is forged in the Z direction of the height of the cuboid, and an impulse current is applied to the aluminum alloy ingot blank at the same time; the aluminum alloy ingot blank is turned over, and forging is performed on the aluminum alloy ingot blank in the Y direction and is supplemented by the impulsecurrent; the aluminum alloy ingot blank is continuously turned over, and forging is performed on the aluminum alloy ingot blank in the X direction and is supplemented by the impulse current to complete one-pass electro-plastic multi-directional forging; the step (3) is repeated to complete multiple-pass electro-plastic multi-directional forging; and a spray-formed aluminum alloy blank is obtainedafter a sleeve is removed. The electro-plastic multi-directional forging method and device for the spray-formed aluminum alloy are suitable for densification of the spray-formed aluminum alloy ingotblank, and the spray-formed aluminum alloy blank with fine grain structures, uniform dispersion distribution of a second phase, a high degree of densification and good mechanical properties can be obtained.

Description

technical field [0001] The invention relates to an aluminum alloy cold working forming technology, in particular to a spray forming aluminum alloy electroplastic multidirectional forging method and device. Background technique [0002] Spray forming technology has greatly improved the cooling and solidification speed of the material during the billet making process. Compared with traditional casting and forming materials, it can have higher alloy composition, finer grains and lower segregation tendency. Spray forming aluminum With its excellent comprehensive mechanical properties such as high strength, corrosion resistance, and good toughness, alloys have been increasingly widely used in my country's aerospace and military industries. [0003] However, the aluminum alloy billet prepared by spray forming technology has a low structure density due to a certain amount of pores, and the existence of an oxide film makes the particles unable to achieve a good metallurgical bond. Re...

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Problems solved by technology

[0005] Wang Lingfang of Harbin Institute of Technology used unidirectional sheathed forging for spray-formed 7075 aluminum alloy (Wang Lingfang. Research on spray-formed ultra-high-strength aluminum alloy sheathed forging process [D]. Harbin Institute of Technology, 2015). It was found that the deformation and cracking behavior was effectively controlled, and the tensile The strength has been improved to a certain extent, but the increase is not obvious, and there are still many microscopic pores in the structure after forging, and the degree of densification is not enough

[0006] Chinese invention patent application: 201810068960.X, the name of the invention is: a multi-directional sheathed forging method for β-solidified TiAl alloy containing Cr and Mo, which uses TiAl alloy for sheathed multi-directional forging to solve the problem of unidirectional forging of existing TiAl alloys Inhomogeneous deformation, strong anisotropy of structure and performance, etc.

However, the heat treatment system before and after forging of this method is complicated, and the blank needs to be heated to above 1150°C, which requires high forging equipment. This method cannot be directly applied and is not suitable for spray forming aluminum alloy materials, and the process is complicated and the cost is high.

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