Method for active control over electric arc additive manufacturing forming quality

Abstract

The invention discloses a method for active control over the electric arc additive manufacturing forming quality. Thermodynamics criteria of stability of an electric arc additive manufacturing forming molten pool are established according to an arc welding molten pool heat source model, the Fourier law and heat conduction and fluid mechanics theories; and an analysis model for forming quality characterization amount and the forming process parameters is established according to the matching relation between the cladding process parameters and additional cooling system control parameters and the interlayer temperature and the forming quality. Based on the thermodynamics criteria of the stability of the molten pool and the analysis model for the forming quality characterization amount and the forming process parameters, optimized electric arc additive manufacturing interlayer temperature distribution characteristics are obtained, and through assistance of a computer, active control over the electric arc additive manufacturing forming quality is achieved by actively controlling the interlayer temperature. The method is an effective method which ensures the excellent surface quality and mechanical property for electric arc additive manufacturing formed parts.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an active control method for forming quality of arc additive manufacturing. Background technique [0002] Additive manufacturing technology is based on the principle of discrete accumulation. With the aid of computer technology, the molten raw materials are melted layer by layer by means of high-energy beams (laser, plasma, electron beam, arc) as heat sources. Build-up enables physical manufacturing of parts. Arc additive manufacturing technology has the advantages of low production cost, high deposition efficiency, and unlimited size of formed parts. It is especially suitable for the manufacture of large-scale, lightweight, functional and complex overall structural parts in the aerospace field. At present, the arc additive manufacturing technology is getting more and more attention in the aerospace field. [0003] At present, there are still great di...

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Problems solved by technology

However, the forming efficiency of this method is low, and the production cost is greatly increased.

Another example is that Dr. Xiong Jun from Harbin Institute of Technology uses a multi-layer single-lane width and height image simultaneous sensing system designed to collect real-time on-line deposition width and height images and then adjust the process parameters to achieve the control of the forming size, but it cannot be realized in real time. Correction of possible dimensional deviations and active control of the microstructure of formed parts

[0005] Although scholars at home and abroad have researched and made positive progress on the control of the shape, structure and mechanical properties of arc additive manufacturing formed parts, it is still impossible to achieve complex metal parts with excellent surface quality and mechanical properties formed by arc additive manufacturing. active control of

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