Multi-target cooperative regulation and control method for electric arc additive manufacturing

Abstract

The invention discloses an electric arc additive manufacturing multi-target cooperative regulation and control method which comprises the following steps: determining an electric arc additive forming process window, and carrying out a single-factor electric arc additive process test and a component mechanical property test on the basis of the electric arc additive forming process window, establishing a multivariate nonlinear objective function of the process parameters on deposition efficiency, deposition layer surface quality and mechanical properties; establishing a finite element thermal coupling model to calculate residual stress and deformation of the component, and obtaining an objective function of the residual stress and the deformation according to experimental test and numerical simulation results; and a multi-target particle swarm method is adopted to realize cooperative regulation and control among the indexes, and an optimal process parameter combination is obtained. According to the method, forming of the electric arc additive component with high efficiency, high surface quality, high mechanical property and low residual stress and deformation can be achieved at the same time, so that multi-target collaborative regulation and control in the electric arc additive manufacturing process are achieved, and the method has important reference significance for collaborative optimization of other additive manufacturing processes.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a multi-objective coordinated control method for arc additive manufacturing. Background technique [0002] Arc additive manufacturing is a process of melting metal wire with an arc as a heat source, and solidifying and accumulating the required parts on a computer-controlled three-dimensional motion platform according to a planned path. The electro-optical conversion rate is about 10%, the arc conversion rate is above 85%), and it is easy to realize automation. Arc additive manufacturing has gradually become an ideal process for efficient and integrated forming of large metal components with its unique advantages. [0003] The parts formed by arc additive should meet the requirements in terms of forming efficiency, surface quality, mechanical properties, stress deformation, etc. However, too many additive process parameters and materials with different properti...

AI Technical Summary

Problems solved by technology

However, too many additive process parameters and materials with different properties will lead to obvious interactive effects of process variables on component performance, and there is a competitive game relationship between each index, it is difficult to achieve collaborative regulation among multiple objectives through a single experimental method

For example, increasing the arc current during deposition can feed more material to improve the forming efficiency, but at the same time it will reduce the mechanical properties of the component; increasing the forming speed can help improve the mechanical properties, but too high a forming speed will cause the surface of the deposited layer to discontinuity or hump defect

Therefore, it is difficult to coordinate and control the performance indicators of components in the arc additive process, which seriously restricts the success rate and quality of component forming.

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