Electric arc additive manufacturing method and device with electromagnetic field and forced processing being combined for assisting

Abstract

The invention discloses an electric arc additive manufacturing method and device with an electromagnetic field and forced processing being combined for assisting. Molten bath heat and mass transfer ischanged by additionally arranging the magnetic field, the stress distribution state of formed workpieces is further changed through plastic forced processing, and thus the fused deposition process can be changed. The method includes the whole forming processes of molten bath solidification and crystallization, solid-state phase transformation to recrystallization and plastic deformation. Variousphysical fields of electromagnetism, heat and force are used for acting on the workpiece forming process, the metallurgy, microstructure and stress-strain distribution state of formed parts are controlled, and hence the properties of the formed parts can be improved. Under the electromagnetic force action on an electric arc fused deposition molten bath by the magnetic field, the molten bath is stirred, and therefore crystal particles are refined, the forming structure is changed and the defects are overcome. A forced processing device followed by a welding gun is used for conducting plastic forced processing on welding beads, residual stresses of the welding beads are reduced, the crystal particles are refined, and the properties like fatigue resistance and crack resistance of the formed parts are improved.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to an arc additive manufacturing technology that can improve the mechanical properties of arc additive manufacturing parts and is combined with forced processing. Background technique [0002] Arc additive manufacturing is a metal additive manufacturing technology that uses a welding arc as a heat source. Arc additive manufacturing uses wire as the forming material. It has high deposition efficiency, low investment in equipment and raw materials, and can directly form a variety of metal materials. It has broad application prospects in the fields of rapid manufacturing, repair and remanufacturing of large and medium-sized metal parts. The main issues with Arc Additively Manufactured parts: [0003] 1) Arc additive manufacturing parts undergo complex thermal cycles, the distribution of residual stress is complex, and the formed parts are easy to deform and crack; ...

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Problems solved by technology

[0003] 1) Arc additive manufacturing parts undergo complex thermal cycles, the distribution of residual stress is complex, and the formed parts are easy to deform and crack;

[0004] 2) The microstructure transformation of formed parts is complex, mainly reflected in the coarse structure, inhomogeneity and anisotropy, and it is difficult to avoid metallurgical defects such as pores, inclusions and composition segregation

[0006] At present, i

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