Magnetic control plasma arc additive manufacturing electric arc and wire tail end position matching method

Abstract

The invention relates to the field of additive manufacturing, in particular to the field of magnetron plasma arc additive manufacturing. The invention discloses a magnetic control plasma arc additive manufacturing electric arc and wire tail end position matching method which comprises the following steps: while a plasma electric arc deflects along the axis center of a welding gun in the additive manufacturing process, a wire feeding device feeds wires in the opposite direction in the deflection direction of the plasma electric arc; and the swing frequency, direction and swing amplitude of the plasma arc are adjusted according to the shape of the additive trajectory, meanwhile, the tail end position and the wire feeding speed of opposite wire feeding are controlled to adjust the fusion width, and the swing frequency, direction and amplitude of the plasma arc are matched with the tail end position and the wire feeding speed of the wire in real time in the additive process to achieve the purpose of additive shape control and property control. Arc control and wire control are combined, so that the plasma arc is matched with the tail end position of the wire in real time, forming of any shape of a single slice layer plane is achieved, and the forming precision of the plasma arc additive manufacturing process is improved; and meanwhile, compared with single-wire feeding, opposite-direction wire feeding increases the fusion width adjusting range and the material increasing efficiency.

Description

technical field [0001] The invention particularly relates to a method for realizing the shape control of the additive material by matching the position of the plasma arc and the end of the wire in the process of magnetron plasma arc additive manufacturing, which belongs to the field of plasma arc additive manufacturing. Background technique [0002] Wire arc additive manufacturing technology is suitable for low-cost, high-efficiency and rapid prototyping of large-sized and complex-shaped components. It is a 3D additive forming technology that complements the advantages of the more mature laser additive manufacturing method. Different from molten electrode arc additive manufacturing, plasma arc additive manufacturing technology has the advantages of high arc energy density, high forming accuracy and short manufacturing cycle. Due to the stable arc column of the plasma arc, the controllability of the plasma arc by using a magnetic field is good, and the swing of the plasma arc...

AI Technical Summary

Problems solved by technology

After searching the existing literature and technology, it was found that the Chinese patent with the application number CN201810092351.8 titled "A Method for Segmented Arc Control Using DC Controlled Magnetic Monopole Rotation" uses DC to control the monopole of the magnetic field to rotate segmentally around the welding torch axis. The technical scheme realizes the circular swing of the plasma arc, and provides a new idea of ​​controlling the plasma arc by a magnetic field; the application number is CN201921489016.8, and the Chinese patent titled "side-axis wire feeding device and additive manufacturing system" adopts side-axis wire feeding The technical solution of the device making circumferential movement around the axis of the welding torch realizes real-time adjustment of the wire feeding direction and the angle between the welding wire and the welding torch. The technical solution adopted in this patent has a high degree of automation of wire feeding, which helps to improve the forming of additive manufacturing quality, but did not propose a specific wire control method; Zhan Bin et al. published "carbon steel double wire and single wire plasma arc additive manufacturing forming and microstructure characteristics" published in the "Journal of Welding" in the sixth issue of volume 40 in June 2019 In the article "Analysis", a "dual wire filling + compressed plasma arc" additive manufacturing process is proposed, which proves that the dual wire plasma arc additive manufacturing process has unique advantages in terms of simultaneous improvement of efficiency and quality

Although the previous technology can achieve the effect of arc control, wire control and double filling wire to improve the efficiency and quality of material addition, it has not solved the problem of matching arc control and wire control in the process of material addition to achieve material control and shape control in any direction.

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