Method of controlling arc length of additive manufacturing arc and flatness of end face of formed part

Abstract

The invention discloses a method of controlling arc length of additive manufacturing arc and flatness of the end face of a formed part. The method includes the following steps that a relation functionbetween wire feeding speed F and additive manufacturing speed TS is established; on TIG arc additive manufacturing platform, single pass and single layer welding are conducted without change of the arc length, recorded welding current and voltage are fitting processed to obtain a linear regression equation of welding current and standard voltage; the voltage difference delta U between the voltageand the standard voltage is calculated, relationship between the delta U and delta F is obtained; and the relation function between the wire feeding speed F and the additive manufacturing speed TS isused for calculating the theoretical wire feeding speed F corresponding to the manufacturing speed TS of different additive, and transferring the signal to a wire feeding machine, the actual wire feeding speed output by the wire feeding machine for is equal to F + delta F. According to the method of controlling arc length of additive manufacturing arc and flatness of the end face of the formed part, the effective control and compensation of the arc length can be realized by using the system, the arc length is always kept within a reasonable range, the flatness of the end face and the formingquality of the formed part are greatly improved.

Description

technical field [0001] The invention relates to a method for controlling the arc length of an additive manufacturing arc and the flatness of an end surface of a formed part, and belongs to the technical field of additive manufacturing. Background technique [0002] The term "3D printing" continues to gain momentum in the context of resource conservation and efficient manufacturing. 3D printing, also known as additive manufacturing, is a new forming technology based on the principle of discrete / accumulation, using filling materials to deposit layer by layer into a three-dimensional entity according to the three-dimensional model of the part. If the traditional parts processing technology is a kind of material reduction processing, on the contrary, additive manufacturing is a processing method of material accumulation. After years of continuous development, products produced by additive manufacturing have been widely used in electronics, military, medical, aerospace and other...

AI Technical Summary

Problems solved by technology

[0005] In traditional TIG automatic welding, the arc length is generally maintained by monitoring the arc length, and the height of the welding torch is changed according to the error between the actual arc length and the standard arc length to maintain the arc length, which requires additional distance detection equipment

Moreover, in the actual additive process, the direction of wire feeding relative to the direction of additive manufacturing will continue to change, and the height of metal deposited at different positions will be slightly different, but after multi-layer accumulation and amplification, the flatness of the end surface of the formed part will decrease.

This point cannot be solved by the traditional arc length stabilization system

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