Metal part additive manufacturing method and corresponding equipment

Abstract

The invention discloses a metal part additive manufacturing method and corresponding equipment. The method comprises the following steps of inputting three-dimensional model data of a part into a control system of a 3D printing device, a control command of the spray head and the working platform planning path is generated; the control system controls a working platform and a spray head to move according to the planning path, mixed materials of the metal powder with the rheological property and the binding agent are sprayed out through a spray head and are adhered to the surface of the workingplatform or on the surface of the deposited model mixture; heating the mixture to a sintering temperature below the melting point of the metal powder by using a heat source, and finishing gasificationand degreasing of the binder and sintering of the metal powder; repeating the two steps until the metal part is printed and formed. According to the metal part additive manufacturing method, the metal powder with rheological property and the binder agent are subjected to injection molding and are subjected to degreasing and sintering synchronously, the size of the parts can be accurately controlled, the device is suitable for manufacturing metal parts with complicated shapes, the injection mold is not needed, the process is simple and practical, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing and metal powder sintering, and in particular relates to a method for directly manufacturing metal parts based on an additive manufacturing process. Background technique [0002] At present, additive manufacturing represented by 3D printing has become a main process of rapid prototyping. 3D printing technologies that can print metal parts include: LOM (layered solid manufacturing), 3DP (three-dimensional printing), SLS (selective laser sintering), SLM (selective laser melting), LSF (laser stereoforming), etc. The principle of LOM forming is to use the data obtained by the laser according to the CAD layered model, use the laser beam to cut the metal foil of the film material coated with hot melt adhesive on one side into the inner and outer contours of a certain layer of the design prototype, and then heat it through the heating roller. Bond the freshly cut layer with the layer cut ...

AI Technical Summary

Problems solved by technology

The material utilization rate of LOM technology is low, the tensile strength of the manufactured metal parts is poor, and the surface of the parts has step texture

3DP printing uses the liquid binder sprayed by the nozzle to bond the metal powder laid on the powder bed to form, and the strength of the part is very low

The printing process of SLM and SLS is very similar, the difference is that SLM uses the metal powder to be completely melted under the heat of the laser beam, and then cooled and solidified to form a shape. This technology does not require secondary sintering, but the energy consumption is very high

LSF also adopts the method of laser melting metal powder to accumulate materials layer by layer according to the contour trajectory, so there is also a shortage of high energy consumption

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