Heat input adjustable consumable electrode arc additive manufacturing method and device

Abstract

The invention discloses a heat input adjustable consumable electrode arc additive manufacturing method and device. In the device, a consumable electrode welding gun, a consumable electrode welding power supply and a workpiece are connected in series to form a consumable electrode arc loop of a consumable electrode arc additive. A TIG welding gun, a TIG welding power supply and the workpiece are connected in series to form a non-consumable electrode arc loop. The TIG welding gun, the consumable electrode welding gun and the TIG power supply are connected in series to form a bypass arc loop. Theconsumable electrode loop is associated with the non-consumable electrode loop and the bypass arc loop through an intelligent circuit switcher. The TIG welding gun is provided with a temperature sensor, the temperature sensor is connected with the intelligent circuit switcher, and the intelligent circuit switcher correspondingly adjusts current according to received temperature signals. By meansof the provided method and device, the problem about decoupling of the relation between consumable electrode arc additive heat input and the deposition amount is solved, regulation and control of theconsumable electrode arc additive heat input are achieved on the premise that the deposition efficiency is not changed, heat accumulation and heat insufficiency in the additive process are avoided, and the forming quality of an additive piece is improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method and device for adding materials by melting electrode arc with adjustable heat input, which is used to solve the problem of poor forming of workpieces caused by excessive or too small heat input in the additive manufacturing process . Background technique [0002] Additive manufacturing technology is based on the idea of ​​discrete-stacking, driven by three-dimensional data of parts, and adopts the method of accumulating materials layer by layer to realize the rapid prototyping of solid parts. The processing process is roughly as follows: first, according to the requirements, use the computer 3D drawing software to draw the 3D image of the part to be processed; secondly, slice the drawn 3D part diagram in a certain way to obtain the 3D data of the part; The obtained 3D data of the parts is imported into the robot operating system, and the robot...

AI Technical Summary

Problems solved by technology

When the heat input is too large and the additive current needs to be reduced, the corresponding wire feeding speed will decrease accordingly, resulting in a decrease in the deposition efficiency; when the deposition amount is increased to increase the wire feeding speed, the additive current will also increase. Excessive heat input leads to poor forming quality

[0004] At present, there are many researches on arc additive materials, but there are few methods and devices that can automatically increase or decrease the heat input according to the temperature of the workpiece for melting electrode arc additive materials.

In 2013, Chen Shujun, Zhang Liang, Bai Lilai, Men Guangqiang, Sheng Shan, Gong Jinlong and others from Beijing University of Technology published the invention patent CN 103521885A "Welding method for double-wire indirect arc alternate bypass" conceived a The welding method of double-wire indirect arc alternate bypass, specifically: in the provided method, two welding torches are used to form two arc circuits of main circuit + bypass and main circuit, and the arc is made to go back and forth between these two circuits through the reversing switch transformation, in order to reduce welding heat input while increasing deposition amount in this way, so as to realize separate adjustment of deposition amount and heat input, although the method provided by this invention can achieve Reduce welding heat input, but this invention cannot effectively solve the problem of increasing the heat input under the premise of ensuring that the amount of deposition remains unchanged, so as to solve the problem that the molten pool cannot spread due to the low substrate temperature and fast heat dissipation at the beginning of welding

The disadvantage of the method provided by this invention is: when the amount of welding deposition remains unchanged and the heat input is reduced, the reversing switch switches the circuit to the main circuit + bypass circuit to reduce the heat input, and the laser heat source at this time is due to the need The bombardment of the droplet promotes its transition, so its energy cannot be too small or zero, which is in contradiction with the requirements of ensuring that the welding deposit remains unchanged and reducing heat input

At the same time, due to the interference between the laser and the arc and the difference in the heating area of ​​the two heat sources, they cannot be well combined, which affects the welding quality

Images