Micro-beam arc selective melting additive manufacturing method based on preset metal powder

Abstract

The invention provides a micro-beam arc selective melting additive manufacturing method based on preset metal powder, which is simple to implement, has good controllability and can realize equipment miniaturization, and belongs to the field of additive manufacturing. The present invention includes: according to the digital model of the part to be processed, determine the layering and the cross-sectional shape of each layer to be processed, and evenly spread a layer of metal powder on the forming table; step 2: preheat the flattened powder layer; Set the tool electrode vertically above the layer, use a DC power supply to power the tool electrode, adjust the gap between the tool electrode and the upper surface of the powder layer, and the gap can be broken down under the action of the set voltage to generate a stable micro-beam arc; Step 4: Tool The electrode scans the current powder layer according to the cross-sectional shape corresponding to it, completes the condensed molding of the cross-sectional shape of the layer, spreads the next layer of powder on the upper surface of the powder layer, completes the fused molding of all layers, and ends. The invention has low cost, long service life and can realize equipment miniaturization.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and relates to an additive manufacturing method, in particular to a micro-beam arc selective melting additive manufacturing method based on preset metal powder. Background technique [0002] Additive manufacturing technology, also known as 3D printing technology, is a technology that directly manufactures physical parts based on digital models by accumulating materials layer by layer. After more than 20 years of development, additive manufacturing technology has been widely used in various fields. [0003] Directly manufacturing metal parts and components, and even assembled functional metal products, is undoubtedly the ultimate goal of additive manufacturing technology proposed by the manufacturing industry. Under the promotion of this goal, metal additive manufacturing technology, as an important branch of additive manufacturing technology, has developed rapidly and has been initially app...

AI Technical Summary

Problems solved by technology

[0007] The metal additive manufacturing technology using laser as the heat source mainly has the following disadvantages: high-power lasers are bulky, expensive, short in life, and difficult to shape materials with low laser absorption rates such as aluminum alloys and copper alloys.

[0008] The metal additive manufacturing technology using electron beam as the heat source mainly has the following disadvantages: the device structure is complex and expensive, and the size of the vacuum furnace has a great limitation on the volume of the component

[0009] At present, the additive manufacturing technology using the arc as the heat source adopts the method of wire feeding, which mainly has the following shortcomings: the shape of the accumulation layer is difficult to control, the transfer of molten droplets is unstable, there is an obvious "step" effect in the metal parts, and the overlapping degree of adjacent sections When it is small or does not coincide, it may need to be supported or it needs to be formed many times or even cannot be formed

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