Feedback control device and method for morphology of tig arc additive forming

Abstract

The present invention proposes a feedback control device and method for TIG arc additive forming topography, the device is characterized in that: the electrode clamp of the TIG welding machine is connected to the welding wire; the welding wire is connected and controlled by the Hall voltage sensor and the A / D converter device; the controller is connected to the wire feeder. Compared with the prior art, the advantage of the present invention is that it ingeniously uses the distribution ratio change of the charged particles (electrons) in the arc on the welding wire of TIG welding to indirectly detect the surface fluctuation of the substrate without adding other detection devices, such as arc length sensors etc., the control system is simple and easy to operate, the cost is low, and the effect is remarkable. Especially for additive manufacturing, the clamping part of the welding torch has a simple structure and high accessibility, which facilitates the rapid prototyping of complex three-dimensional structures. In addition, this method can realize simultaneous arc striking on the welding wire during surfacing welding forming, which has the effect of hot wire and significantly increases the forming efficiency.

Description

technical field [0001] The present invention relates to the field of feedback control of TIG surfacing welding wire feeding speed, in particular to a device and method suitable for controlling and correcting the surface topography of TIG arc-filling wire additive manufacturing (wire and arc additive manufacture, WAAM) formed parts . Background technique [0002] TIG arc wire-filled additive manufacturing (WAAM) uses electric arc as the heat source and adopts layer-by-layer surfacing welding to manufacture metal solid components. Its forming speed is high, and large parts ranging from several kilograms to several tons can be quickly formed at a low cost. , suitable for 3D integrated additive manufacturing of large-scale complex components. [0003] This technology is developed based on the deep combination of material science and digital control means. Compared with energy-carrying beams such as lasers and electron beams, the arc has special characteristics of "force", "heat...

AI Technical Summary

Problems solved by technology

Although this method weakens the defect size of surface bulges and depressions to a certain extent, it does not fundamentally solve the problem of 3D forming consistency of WAAM. While obtaining the consistency of pile height, it often introduces width fluctuation defects. If only single-wall and thin-wall This method is feasible for parts, but the shape control effect of this method is not ideal for parts with a certain thickness formed by multi-pass lapping additives;

[0011] The second type of method uses the combined manufacturing technology of additive and subtractive materials. Although this method is feasible, if it is to realize digital automatic additive manufacturing, it is necessary to add necessary auxiliary systems, such as real-time on-line monitoring systems for stack height and width, and milling processing. Dimensional feedback control, etc., the forming system is complex and the equipment cost increases, and the milling speed is much lower than the surfacing forming speed, which is not conducive to taking advantage of WAAM's low-cost rapid prototyping

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