Plastic forming and toughening technology method based on ultrasonic vibration and device thereof

Abstract

The invention belongs to the field of amorphous alloy thermoplastic forming and discloses a plastic forming and toughening method and a device based on ultrasonic vibration. The method comprises the steps: (a) dividing a part with toughness to be enhanced on an amorphous ally part to be formed to be used for generating a nanocrystalline toughening phase; (b) designing a toughening device for forming, wherein the toughening device comprises an insert block connected with an ultrasonic vibration amplitude change pole and a heating rod, the insert block corresponds to the part with the toughnessto be enhanced and is used for exerting ultrasonic vibration on the part with the toughness to be enhanced, and the heating rod is used for heating raw material blank to be processed to a forming temperature; (c) putting the raw material blank in the device, heating by the heating rod, mould closing the device to form a required amorphous alloy part, starting ultrasonic vibration in a mould closing process and stopping in mould opening. Meanwhile, the invention further discloses the utilized device. By means of the plastic forming and toughening method disclosed by the invention, toughening and plastic forming can be performed at the same time, so that forming and toughening integration is achieved, production work procedures are simplified, processing time is shortened, and dimensional accuracy is improved.

Description

technical field [0001] The invention belongs to the field of thermoplastic forming of amorphous alloys, and more specifically relates to a plastic forming and gradient toughening method and device based on ultrasonic vibration. Background technique [0002] Amorphous alloy is a new type of material with excellent properties such as high strength, corrosion resistance and wear resistance. Amorphous alloys exhibit good superplasticity in the hot state and can achieve near net shape of parts. However, the significant room temperature brittleness of amorphous alloys makes amorphous alloy parts directly undergo brittle fracture and fail completely once they are overloaded during service, making it difficult to be directly applied to occasions with impact loads. Therefore, it is necessary to further improve its toughness without weakening the excellent properties of amorphous alloys, so as to improve the impact resistance of amorphous alloy parts. [0003] Amorphous alloys are i...

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Problems solved by technology

After treatment by this method, under the premise that the fracture strength remains unchanged, the room temperature compression plastic deformation capacity of the amorphous alloy is significantly improved, and the heat release of relaxation is also increased. However, this method can only strengthen and toughen the amorphous alloy sample as a whole. It is impossible to retain part of the amorphous region according to the actual use requirements to form an amorphous matrix composite material with a gradient of mechanical properties; patent CN102002659A proposes a method for continuous nanocrystallization of amorphous alloy strips

In this scheme, below the glass transition temperature of the amorphous alloy, the amorphous alloy strip is pressed tightly on the top of the horn of the power ultrasonic device, and the amorphous alloy strip exerts ultrasonic action on the strip while moving the horn of the ultrasonic device, thereby To realize the continuous nanocrystallization of amorphous alloy strips, the method can only carry out integral treatment of amorphous alloy strips, which can neither handle actual parts with complex shapes nor achieve nanocrystalline gradient toughening; patent CN105420522A proposes a A method for preparing an amorphous matrix composite material. In this method, the sheet-shaped amorphous alloy and the toughened second phase material are alternately laminated and then placed in a fixture. Under the condition of constant pressure or increasing load, the laminated amorphous alloy and The porous plate is heated and ultrasonic vibration is applied to it, and the amorphous alloy is rapidly softened and pressed into the pores of the second-phase toughened plate, thereby obtaining an amorphous alloy composite material with good plasticity. The second is the overall toughening of amorphous alloys, which is also only suitable for the processing of plate products, and cannot handle actual parts with complex shapes and local nanocrystalline gradient toughening according to the performance requirements of parts; the above three strengthening and toughening methods , have not been combined with the thermoplastic forming process of amorphous alloys, but require special treatment after the parts are formed and manufactured. The process is complicated and the production cycle is long.

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