Method for improving arc additive manufacturing precision and forming efficiency of wire material

Abstract

The invention discloses a method for improving arc additive manufacturing precision and forming efficiency of a wire material and belongs to the technical field of advanced manufacturing. The problemsthat during arc additive manufacturing of a conventional wire material, the size precision and the surface quality of samples are poor, the heat inputting is limited, and the forming efficiency is not high are solved. According to the method, the relative positions of a forming mold and a welding gun are fixed, the mold forming face in the forming process is made to keep being in contact with theside face of a molten pool, the shape of the molten pool is restrained, the molten pool is made to be solidified under the mold restraint, micro casting of metal of the molten pool is achieved, and the consistency of the welding bead width and stable process parameters are guaranteed in the forming process, so that the size precision and the surface quality of the formed samples can be improved;and by means of water cooling on the mold, cooling on the molten pool is enhanced, changing of the cooling conditions is reduced, and the uniformity of the performance of the structures of the samplesis guaranteed. On the other hand, because the mold is adopted to restrain the metal of the molten pool, the linear energy can be increased, it is not needed to worry that because of free flowing of the molten pool, forming cannot be achieved, and therefore the forming efficiency is improved.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology, and provides a method for improving the accuracy and forming efficiency of wire arc additive manufacturing, which is used for additive manufacturing of parts and molds, can improve the dimensional accuracy and surface quality of samples, and improve the forming efficiency. Background technique [0002] Wire Arc Additive Manufacturing (Wire Arc Additive Manufacturing, WAAM) uses arcs such as non-melting electrodes, melting electrodes or plasma arcs as heat sources, and is formed by continuously melting wire materials layer by layer. It has the advantages of large forming size, simple equipment, low cost, It has the advantages of high material utilization rate and deposition efficiency, and the cladding rate can reach 50~130g / min. It is a practical method for producing medium and large parts, and has become one of the methods that can realize economical and rapid prototyping of high-...

AI Technical Summary

Problems solved by technology

Due to the continuous change of sample size and heat accumulation during the forming process, it is very difficult to maintain consistent heat dissipation conditions in the molten pool, and reducing heat input will cause changes in layer height, resulting in non-uniformity of layer height, and maintaining interlayer temperature and Reduced heat input reduces cladding deposition efficiency

[0006] Zhang Haiou and others from Huazhong University of Science and Technology invented an incremental manufacturing method for parts or molds (CN105312570A) and a metamorphic forming device for additive manufacturing (CN102896173A). The indenter performs rotary compression processing on the softened semi-solidified area or the solidified area to improve the forming accuracy and product quality. The rotary indenter mainly compresses the solidified or solidified metal to ensure dimensional accuracy and performance quality. The head needs to adopt a pressurizing mechanism, and the structure of the required device is complex

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