An Arc Additive Manufacturing Wire Feeding System for TIGS

Abstract

The invention discloses a wire feeding system for arc additive manufacturing suitable for TIG; the wire feeding machine of the system is fixed directly above the welding torch through a bracket, and the wire feeding distance is shortened; the welding wire is sent out by the wire feeding machine and straightened by a straightening mechanism Entering the wire feeding copper tube, the wire straightening mechanism mainly straightens the welding wire through two sets of wire guide wheels arranged vertically to realize the control of the pressing force of the welding wire, thereby optimizing the straightening and stabilizing the wire feeding, and the three-dimensional adjustable feeding The wire clamp adjusts the position of the bottom end of the wire feeding copper tube so that the tip of the welding wire is located directly below the welding torch, ensuring that the tip of the welding wire points to the central area of ​​the molten pool; the wire feeder, the straightening mechanism and the welding torch of the present invention move synchronously and maintain The distance of the welding wire is always constant, the feeding position of the welding wire can be adjusted through the three-dimensional adjustable wire feeding fixture, the wire feeding resistance is small, the wire feeding is stable, and the forming accuracy is high. TIG-based arc additive manufacturing of welding wire as raw material.

Description

【Technical field】 [0001] The invention belongs to the field of arc additive manufacturing, and in particular relates to a wire feeding system for arc additive manufacturing suitable for TIG. 【Background technique】 [0002] Arc additive manufacturing (Wire and arc additive manufacturing referred to as WAAM) is a method that uses the principle of arc layer-by-layer surfacing to realize three-dimensional manufacturing. It is mainly suitable for the manufacture of large metal parts related to aerospace. It is characterized by no Mold, low manufacturing cost, high forming efficiency, dense formed parts, short processing cycle, and only a small amount of machining is required for the final formed parts, so arc additive manufacturing has attracted extensive attention from researchers. How to improve the surface quality, machining accuracy and internal quality of formed parts has become a hot issue in the research of arc additive manufacturing. Ensuring the stability of wire feedin...

AI Technical Summary

Problems solved by technology

[0003] The current wire feeding system for arc additive manufacturing has the following problems: (1) The moving torch during forming inevitably leads to different degrees of bending and inclination of the wire feeding tube, which increases the resistance of wire feeding and reduces the stability of wire feeding sex

(2) After the welding torch and tungsten electrode are used for a period of time or when the welding torch and tungsten electrode are replaced, the position of the wire feeder must be repositioned to ensure that the welding wire falls directly below the tungsten electrode to avoid the problem of wire deviation during forming, while the traditional The three-dimensional adjustable wire feeding fixture has a complex structure, limited adjustment range, and is only suitable for wire feeding metal tubes of the same diameter specification, which is expensive and relatively poor in rigidity

(3) When the welding wire wound on the wire feeding turntable is pulled out for use, due to the influence of the internal stress of the welding wire, the welding wire will continuously roll and twist in the wire feeding tube, and at the same time, the wire end will be deflected

The traditional wire feeding system is difficult to ensure the stability of the high-strength and large-rebound welding wire when it is sent out from the wire feeding guide nozzle, and it is prone to wire deviation, resulting in inaccurate wire feeding position, and even welding wire is not melted by the arc, resulting in forming defects

Chinese patent (application number 20121009696351.8) discloses a wire alignment method and device for metal wire melting processing. The device uses a camera to capture images of the molten pool and its vicinity, and compares the relative positions of the wire tip and the center of the molten pool. , to send a feedback signal to adjust the self-adaptive alignment of the wire, that is, to realize the precise adjustment of the position through real-time feedback, but because of the lack of instantaneous feedback, the position of the wire is still inaccurate in the process of additive manufacturing

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