Multi-layer multi-pass composite wire arc additive manufacturing method and system for metal structure

Abstract

The invention provides a multi-layer and multi-pass composite wire arc additive manufacturing method and system for a metal structure. The multi-layer and multi-pass composite wire arc additive manufacturing method for the metal structure comprises the following steps of: 1, selecting a welding wire and a substrate required for forming a specific metal structural part, and determining technological parameters; 2, generating a multi-layer and multi-pass wire arc additive path of outer wall, short straight line filling and layered turning filling; and 3, enabling a welding gun to move according to the generated multi-layer and multi-pass wire arc additive path under the driving of a robot. The welding gun is driven by the robot to conduct 3D printing according to the generated outer wall, short straight line filling and layered turning filling composite path; the outer wall path improves the size precision of a formed workpiece; the short straight line filling path solves the problem that the heights of complex structural parts are inconsistent in the printing process, and obvious macro buckling deformation is not prone to being formed; and through layered turning filling, interlayer defects are greatly reduced through, and the mechanical property of the workpiece is improved. Digitization, intellectualization and parallelization of part manufacturing are achieved.

Description

technical field [0001] The invention relates to a metal structure multi-layer multi-channel composite arc additive manufacturing method and system, and relates to the field of additive manufacturing. Background technique [0002] Arc Additive Manufacturing (Wire Arc Additive Manufacture, WAAM) is a method that uses an arc or plasma arc as a heat source to melt metal welding wire, and adopts the principle of layer-by-layer cladding under the control of a program or software. It is an advanced digital manufacturing technology that produces a three-dimensional metal blank that is close to the product shape and size requirements. Arc additive manufacturing technology has the advantages of low manufacturing cost, high material utilization rate, and high production efficiency. In recent years, the use of arc additive manufacturing technology for multi-layer and multi-pass printing to obtain complex metal parts with high dimensional accuracy, good surface quality and excellent mec...

AI Technical Summary

Problems solved by technology

[0003]The formed parts of arc additive manufacturing are composed of full weld metal. The existing multi-layer and multi-pass arc additive technology has the following problems: the arc additive manufacturing process starts Inconsistency in the height of the arc closing position will cause the arc crater to collapse; there are many structural features of complex metal parts, and the height inconsistency will appear in the printing process; the heat input in the arc additive manufacturing process is large, and the liquid molten pool is very easy to Flowing to both sides of the melting channel will cause low forming accuracy of the side wall of the part

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