A heat source assisted friction stir additive manufacturing device and method

Abstract

A heat source-assisted friction stir additive manufacturing device and method for realizing high-quality and high-efficiency additive manufacturing of various metal materials. The device consists of an additive manufacturing stirring head, an eddy current heating system and a powder conveying system; the additive manufacturing tool consists of a rolling slope, a shaft shoulder, a stirring needle and a clamping device; the eddy current heating system consists of a shell, a fixing device and an eddy current coil The powder conveying system consists of a powder storage tank, a powder conveying positioning ring and a powder conveying channel. During the friction stir additive manufacturing process, first, the substrate is fixed on the welding machine table, and additive powders such as aluminum, copper, titanium, and high-entropy alloys are added to the powder storage tank; the additive manufacturing stirring head is assembled, and the The stirring head holding device is fixed on the main shaft of the welding machine. Then, the eddy current coil is energized, and the stirring head and the additive powder are heated by the generated eddy current; then the welding machine is started, and the powder feeding system is turned on, and friction stir additive manufacturing is performed to obtain an additive structure with a predetermined thickness and shape.

Description

technical field [0001] The invention belongs to the field of friction stir welding, and in particular relates to a heat source-assisted friction stir additive manufacturing device and method. Background technique [0002] Friction stir additive manufacturing technology is a new type of additive manufacturing technology based on the principle of friction stir welding. The main technical approach of this technology is based on the powder-feeding friction stir deposition technology, which is added by repeated friction stir deposition, and parts with predetermined thickness and shape are obtained. Friction stir additive is formed from solid phase powder into a solid phase additive layer, without the melting and solidification process of materials, so there will be no defects such as cracks and pores, which can effectively solve the problems of pores, pores, etc. Cracks and the resulting low strength of additive structures are insurmountable problems. [0003] At present, there...

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Problems solved by technology

Both of them use the needleless stirring head for powder feeding and additives. Although they have achieved certain results, their inherent disadvantages are that they rely solely on the shaft shoulder of the stirring head and lack the participation of the stirring needle, which makes it difficult to ensure the accuracy of each additive. The tight bonding between layers also has limited applicability for the addition of alloys with higher melting points such as titanium alloys and copper alloys.

Invention patent CN109128487A discloses "A Method for Additive Manufacturing of Magnetic Powder Materials Based on Friction Stir Welding". The performance of the prepared magnetic materials is greatly improved compared with the materials obtained by hot pressing sintering, which broadens the application range of magnetic materials, but This method is mainly used to realize single additive manufacturing, and the efficiency is low

Invention patent CN112404453A discloses "A Method for Additive Manufacturing of Ultra-Fine Grain Material". The powder is pre-mixed and sprayed on the surface of the substrate, and then treated by friction stir welding to obtain an ultra-fine crystal deposit. The method is simple to operate , can realize the additive manufacturing of parts with complex shapes, but the powder is easy to splash out of the additive layer, and the material utilization rate is low. At the same time, due to the small thickness of the single spray layer, the additive efficiency is low

Invention patent CN108161448A discloses "A New Type of Friction Stir Additive Manufacturing Machine", which can remove defects such as burrs while achieving material addition, obtain a relatively flat surface, and provide better surface conditions for the second additive. However, when the additive powder reaches the powder outlet, it will be taken out by the rotating shoulder, and only a very small part of the powder can be squeezed by the shoulder to achieve additive, resulting in low additive efficiency of the device and a large waste of material

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