Additive manufacturing device and method

Abstract

The embodiment of the invention relates to an additive manufacturing device and method. The additive manufacturing device comprises a forming bin, a forming base plate, an electron beam heat source, a powder bin set, movable powder feeding units and a control unit. According to the additive manufacturing device and method, the impurity content in a printed part is reduced due to the high-vacuum clean environment, and the problem of brittleness deterioration caused by the too high impurity concentration is prevented; and in addition, the multiple powder bins and the movable powder feeding units are adopted, and the problem that double metal or multiple metal is difficult to machine is solved. Meanwhile, a double-metal component in a complex shape can be directly formed, subsequent machining and heat treatment are not needed, and the material utilization rate is increased; and compared with a traditional machining process, the manufacturing period is greatly shortened, and cost is saved. A multi-time multi-layer scanning manner is adopted in a fusion bonding interface, and the bonding strength of the bonding position can be better improved.

Description

technical field [0001] Embodiments of the present disclosure relate to the technical field of metal additive manufacturing, and in particular, to an additive manufacturing device and method. Background technique [0002] Bi-metal / multi-metal composite materials are composed of two or more layers of metal alloys. Due to the combination of the advantages of two or more metals, they have a wide range of usability and process performance. Because of their special structure and properties, It can replace expensive materials or scarce metals in actual production. Nowadays, many bimetallic materials have been put into production, such as steel plates, steel bars, steel wires, steel pipes, etc. In the selection of metal materials, the main stress-bearing components are generally composed of thicker metals. In order to save costs, the main stress-bearing base materials will choose cheaper metals. According to the demand for bimetallic materials / multi-metallic materials, different c...

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Problems solved by technology

[0003] The existing bi-metal / multi-metal processing technologies include the existing explosive composite technology, rolling composite method, powder metallurgy method, etc. First of all, due to the complexity of the processing method, the processing technology is relatively cumbersome, the production efficiency is low, and the cost is high. ; Second, most of the methods cannot directly shape the product parts, and it is necessary to realize the forming of the overall structural parts by welding. During welding, the performance of the welded joints is complicated due to the difference in materials; thirdly, it is easy to make bimetallic or multi- The metal bonding interface becomes the weakest point of the whole material or structure

The existing laser selective melting technology, because the energy source is laser, is difficult to form refractory metal materials, and for some structural parts with better performance, refractory metals are often used as the second metal, and at the same time, the residual stress of laser printing parts is more , which is not conducive to forming brittle materials, and because the difference in linear expansion coefficient between bimetals may be very large, it is more likely to cause stress concentration, which will lead to poor quality of structural parts and affect product yield

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