Friction stir forging additive manufacturing method and device for nano-reinforced matrix composites

Abstract

The invention relates to a friction stir forging additive manufacturing device for nano-reinforced matrix composite materials, comprising four parts: a friction stir additive spindle, an isothermal forging mechanism, a gantry-type frame and a worktable; the friction stir additive spindle is used to realize powder or Mixing, preheating and feeding of granular materials, and friction extruding the material output from the feeding hole, using friction heat and pressure to achieve layer-by-layer additive manufacturing on the substrate; isothermal forging mechanism is used to realize additive manufacturing. Isothermal forging and micro-shaping of layers; gantry frame is used to fix the friction stir spindle and isothermal forging mechanism and realize the feed and swing angle adjustment of the friction stir spindle and isothermal forging mechanism along the Y and Z axes; the worktable is used for fixing The base body and the realization of the feed of the base body along the X axis. The invention can realize high-efficiency and high-quality additive manufacturing of light alloy powder or granular material, and has the advantages of higher efficiency, simple operation and lower energy consumption.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing of composite materials, and in particular relates to a friction stir forging additive manufacturing method and device for nano-reinforced matrix composite materials. Background technique [0002] In recent years, countries around the world have attached great importance to the development of additive manufacturing technology, and metal additive manufacturing is recognized as the highlight of 3D printing. The commonly used metal additive manufacturing methods include laser, electron beam and electric arc additive manufacturing, but there are many problems in the additive technology of light alloys. Due to the large linear expansion coefficient and high thermal conductivity of light alloys, the forming rate is slow, the light reflectivity is high, the energy utilization rate is the highest, and the deformation is large when laser is added; when electron beam is added, the size of the ...

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Problems solved by technology

Due to the large linear expansion coefficient and high thermal conductivity of light alloys, the forming rate is slow, the light reflectivity is high, the energy utilization rate is the highest, and the deformation is large when laser is added; when electron beam is added, the size of the part is limited and the deformation is large. ; During the arc additive process, the deformation of the component is serious, and the size is difficult to control, etc.

[0003] Jeffrey Patrick Schultz et al. proposed a solid-phase additive manufacturing process that uses friction and pressure to deposit metal powder materials or bars without melting based on the principle of friction stir welding. The additive process is similar to friction stir welding. Layer lapping is a process of spatial lapping, including lateral addition perpendicular to the direction of the lap and addition parallel to the direction of material thickness. However, the microstructure and properties of the friction stir welded lap joint are closely related to the state of the bonding interface. Prone to interface distortion and cold lap defects, which will reduce the performance of the joint

The friction stir additive manufacturing process is similar to lap joints, and corresponding defects may also occur, which will affect the microstructure and properties of additive materials.

Moreover, with the increase of the number of surfacing layers and the influence of multiple heating cycles, the grain size in the stirring zone of the additive layer gradually increases from top to bottom. This phenomenon of uneven grain size distribution will also affect the The structure and properties of the material

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