Two-step blow forming method and device for amorphous alloy special-shaped tube

Abstract

The invention discloses a two-step blow forming method and a two-step blow molding device for an amorphous alloy special-shaped tube, and belongs to the field of the plastic forming of amorphous alloys. The method comprises the following steps of: heating a preformed variable-thickness amorphous alloy plate blank to a supercooling liquid phase area, introducing preheating pressure gas, and performing blow forming until the plate blank is adhered to a die to complete the performing of an amorphous alloy tube blank; and cooling the tube blank quickly, heating to the supercooling liquid phase area to perform secondary blow forming, and after cooling, opening the die to complete the forming of the amorphous alloy special-shaped tube. In the method, the forming capacity of amorphous alloy parts with complex shapes is improved by the two-step preblow forming of the variable-thickness amorphous alloy plate blank and the amorphous alloy tube blank, and the method and the device also can be used for the blow forming of containers and shell and cover parts which are made of amorphous alloy.

Description

technical field [0001] The invention relates to a forming method and device for an amorphous alloy special-shaped tube, belonging to the technical field of amorphous alloy plastic forming. Background technique [0002] In recent years, many studies on bulk amorphous alloy materials (BMGs) have shown that compared with crystalline alloy materials with the same composition, BMGs have superior mechanical properties, excellent physical and chemical properties. For example: compared with the corresponding crystalline alloy materials, Zr-BMGs (Zr 44 Ti 11 Cu 10 Ni 10 be 25 ) has: (1) higher tensile strength and lower elastic modulus (the ratio can reach 200%); (2) under the same fatigue limit, it has higher fatigue resistance stress level; (3 ) at a certain strain rate and molding temperature, it has good plastic molding performance; (4) the Newtonian fluid behavior in the supercooled liquid region (SCLR) makes it have good molding performance, which can realize fine feature ...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the defects of existing processes and devices, such as limited by material threshold temperature, high shrinkage rate, extremely high cooling rate, easy to be polluted, and difficult to flow, etc. The two-step blow molding in the supercooled liquid phase region can effectively reduce the required molding pressure and mold investment cost, and improve the molding ability of amorphous alloy parts with complex shapes.

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