Accurate forming method and accurate forming system in TIG electric arc additive manufacturing process

Abstract

The invention relates to an accurate forming method and an accurate forming system in a TIG (Tungsten Inert Gas) electric arc additive manufacturing process. According to the method, a high-low pulse current group waveform mode is used as an output mode of arc current, the high-low pulse current group waveform comprises a high pulse current group wave band and a low pulse current group wave band which are continuously output at intervals, meanwhile, a wire feeding time sequence waveform of a welding wire is controlled through a wire feeding waveform matched with the current, the welding wire is controlled to be fed in the high pulse current group wave band, and wire feeding is stopped in the low pulse current group wave band. The low pulse current group wave band electric arc is used for heating and melting base metal and maintaining electric arc combustion, and the high pulse current group wave band electric arc is used for melting welding wires to form molten drops, transiting the molten drops into a molten pool and stirring the molten pool. The control method that a high-low pulse current group is matched with a fixed-step-length wire feeding time sequence waveform is adopted, the problems that in consumable electrode arc additive, heat-force of an arc-molten drop-molten pool system is strongly coupled, the process stability is difficult to control, and the forming precision is low are solved, and the additive forming precision is improved.

Description

technical field [0001] The invention relates to the field of arc additive manufacturing of metal materials, in particular to a precise forming method and a precise forming system of a TIG arc additive manufacturing process. Background technique [0002] Additive Manufacturing (AM) technology is a rapid prototyping technology based on the principle of discrete accumulation, which uses three-dimensional data to accumulate materials layer by layer to form solid parts. Compared with the traditional machining technology, AM technology has the unique advantages of highly integrated product digital design, manufacturing and analysis, which can significantly shorten the product development cycle and reduce manufacturing costs, especially for the production of products with complex structures and high added value of raw materials. The advantages of rapid and efficient forming are more prominent. Faced with the manufacturing requirements of high-precision, high-performance, low-cost ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a precise forming method of the TIG arc additive manufacturing process to solve the arc-droplet-melt pool system stability caused by the strong coupling of heat-mass transfer in the arc additive manufacturing process existing in the prior art low and difficult to precisely control the forming precision; at the same time, the purpose of the present invention is also to provide a precise forming system using the above precise forming method

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