Method and device for additive manufacturing of slurry-feeding metal parts

Abstract

The invention discloses a slurry feeding type metal part material increase manufacturing method. The method comprises the steps that metal powder, binders and organic solvents are mixed together to form a solid-liquid two-phase slurry material, and slurry is taken as adding materials for material increase manufacturing; the slurry is sent out through a slurry feeding device, a heat source is adopted to conduct heating on the slurry material, fusion between layers of the slurry is achieved, and metal parts are formed by overlaying melt layers of the slurry layer by layer. By means of the slurry feeding type metal part material increase manufacturing method, the problems existing in powder feeding type and wire feeding type metal material increase manufacturing are solved, and advantages of the powder feeding type and the wire feeding type metal material increase manufacturing are synthesized, so that the slurry feeding type metal part material increase manufacturing method has the advantages that the material manufacturing cost is low, the material utilization is over 90%, requirements for the shape and the size of powder are low, powder pollution does not exist, the adding materials are stable and controllable, and the applicability is strong. The invention further discloses the slurry feeding device of the metal part material increase manufacturing method.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and relates to a method and device for additive manufacturing of metal parts, and more specifically, to a method and device for additive manufacturing of slurry-feeding metal parts. Background technique [0002] Additive manufacturing technology is an emerging manufacturing technology that has been rapidly developed by interdisciplinary material science, mechanical science, and information science in recent years. Features, known as the representative technology that is expected to produce the "third industrial revolution", is the leading technology for the development of mass production mode to personalized manufacturing mode. For metal additive manufacturing, the current main method is based on CAD data, using heat sources (such as lasers, plasma arcs, electron beams, etc.) Sequential accumulation of points, lines, surfaces, and volumes enables bottom-up component manufacturing....

AI Technical Summary

Problems solved by technology

[0004] (1) The burning process of powder during transportation and interaction with heat source can easily lead to low powder utilization rate, only 20%-30%

[0005] (2) There is dust pollution, which is harmful to the environment and the health of workers

[0006] (3) The powder feeding process has high requirements on the shape and particle size of the powder. Only powder with a particle size close to the round shape can obtain a relatively stable powder feeding process. When using nanomaterials, due to the high agglomeration and adsorption properties of the material itself, The powder is often adsorbed on the tube wall causing the failure of the powder feeding process

[0007] (4) The response effect of the adjustment of the powder feeding amount is poor, and it takes a certain response time from the adjustment of the feeding amount to the powder output of the nozzle

[0009] (1) Wire drawing is performed using wire manufacturing equipment that requires a relatively high cost

[0010] (2) Metal alloys with poor plasticity are difficult to manufacture into wires

[0011] (3) Poor adaptability to position when adding wire, generally only applicable to horizontal position

[0012] (4) Wire metal is difficult to melt, requires a high energy density heat source, and the coordination between the heat source and wire feeding is strictly required, and problems such as sticking wire and jacking wire are prone to occur

At present, slurry materials are mainly used in metal powder injection molding technology, but this technology is to first inject the slurry into the mold to form, and then degrease and sinter the formed material to manufacture metal parts; it has higher requirements on the injection equipment, and Forming of parts still requires the help of molds

However, the research on the application of slurry materials to the additive manufacturing of three-dimensional metal parts has not yet been carried out, and there are no related reports proposing or performing similar work.

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