Metal three-dimensional printing method and equipment

Abstract

The invention discloses a metal three-dimensional printing method and equipment. A core method of the method comprises the following steps of putting molten or softened and flowable metal into a forming area used by three-dimensional printing equipment, converting the molten or softened and flowable metal without flowability into printed and formed metal, accumulating the molten or softened and flowable metal on the printed and formed metal until a to-be-printed object is formed, and forming the to-be-printed object by the accumulated printed and formed metal. The metal three-dimensional printing method is characterized by comprising the following steps of accumulating the molten or softened and flowable metal and the printed and formed metal in a partial area of the forming area; accumulating powder in the partial area of the forming area; and taking the accumulated powder as an auxiliary support, and providing support for the to-be-printed object. A metal part with a complex shape and structure can be manufactured, and the generated metal part is high in strength, is high in density and is high in forming precision; a large metal part can be printed; and the equipment is simple in structure and is low in cost.

Description

technical field [0001] The invention relates to three-dimensional printing technology, in particular to a metal three-dimensional printing method and equipment thereof, and belongs to the technical field of additive manufacturing. Background technique [0002] 3D printing technology first originated in the United States at the end of the 19th century, and was perfected and commercialized in Japan and the United States until the 1970s and 1980s. Common mainstream 3D printing technologies, such as stereolithography (StereoLithography Apparatus, SLA), fused deposition manufacturing (Fused Deposition Modeling, FDM), selective laser sintering (Selecting Laser Sintering, SLS), three-dimensional powder bonding (Three DimensionalPrinting and Gluing, 3DP), was commercialized in the United States in the 1980s and 1990s. The currently commercialized technologies for 3D printing of metal materials mainly include Selective Laser Melting (SLM) and Electron Beam Melting (EBM), but SLM and...

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Problems solved by technology

In view of the shortcomings of the above-mentioned SLM and EBM technologies, there have also been many low-cost metal 3D printing technologies using other forming methods, for example, the application number is 201510789205.7, and the name is "a method and device for direct 3D printing and manufacturing using liquid metal" Another example is the Chinese patent application with the application number 201410206527.X and the name "extrusion metal flow 3D printer", but these technologies cannot manufacture parts with complex cavity structures inside, and these technologies have molding accuracy Problems such as low or low interlayer bonding of printed metal layers

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