Coaxial wire feeding and powder feeding melting pole arc additive manufacturing device and process

Abstract

The invention provides a coaxial wire feeding and powder feeding melting pole arc additive manufacturing device and process. A central body which allows a welding wire (1) passes through passes through the center of a four-way powder feeding nozzle (7), the welding wire (1), the central body and the four The four-way powder feeding nozzle (7) adopt coaxial design; the four-way powder feeding nozzle (7) is connected to an external powder feeder and surrounds the central body (3); a powder feeding channel (6) in the four-way powder feeding nozzle (7) adopts truncated cone design; a protective gas channel (9) is formed between the central body (3) and the four-way powder feeding nozzle (7); and the four-way powder feeding nozzle (7) is provided with a cooling water channel (5). The design ofthe four-way powder feeding nozzle enables alloy powder to be uniformly converged above a molten pool, so that a deposited layer is formed more uniformly, and the alloy powder melts by absorbing the heat of electric arc, which reduces defects of the collapse of a printed layer caused by excessive heat input during the printing process and the molten pool flowing downwards.

Description

technical field [0001] The invention relates to a coaxial wire-feeding powder-feeding melting electrode arc additive manufacturing device and process, belonging to the field of arc additive manufacturing. Background technique [0002] Arc Additive Manufacturing (WAAM) uses electric arc as heat source and welding wire as additive material to quickly form complex geometric components with high density and good mechanical properties, shorten the production cycle of products, and greatly improve the utilization rate and production of materials. Efficiency, improve the core competitiveness of manufacturing technology. [0003] MIG / MAG / CMT arc additive manufacturing: The melting electrode gas shielded arc uses the arc between the meltable welding wire and the workpiece to be welded at a continuous constant speed as the welding heat source to melt the welding wire and the base material to form a molten pool. Its advantages are: wide adaptability; using welding wire as electrode, l...

AI Technical Summary

Problems solved by technology

[0007] Check the relevant literature on existing arc 3D printing devices at home and abroad. At present, arc additive manufacturing methods include: coaxial and side-axis single- and double-wire arc 3D printing, and no single-filament arc four-way powder feeding 3D printing device and process method has been found. , although the utilization rate of multi-filament arc 3D printing is high, its printing stability is poor, and the number of multi-filament heat sources is large, so that the heat input is too large, resulting in large thermal stress deformation

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