Mesoscopic simulating method for light-solid coupling process of laser beam and powder particles

Abstract

The present invention discloses a mesoscopic simulating method for the light-solid coupling process of a laser beam and powder particles, and belongs to the technical field of a laser metal forming process. The method comprises: building a three-dimensional randomly-distributed particle accumulation model of a powder bed in a mesoscale; building a control equation of the three-dimensional randomly-distributed particle accumulation model; and resolving the three-dimensional randomly-distributed particle accumulation model by using a multi-phase flow algorithm under the constraint of the control equation so as to acquire a melting flow process. According to the mesoscopic simulating method for the light-solid coupling process of the laser beam and the powder particles, an effect of a powder particle stacking structure on laser absorption is considered; a coupling process of the powder particles and the laser is simulated; the temperature of the coupling process is numerically simulated to record a powder particle melting process; a temperature field and changes do not need to be observed after processing parameters are changed; a melting bath model is avoided being built on a macroscopic level; and the effect of the powder particle stacking structure on the light-solid coupling process is not considered.

Description

technical field [0001] The invention discloses a mesoscopic simulation method for the light-solid coupling process of a laser beam and powder particles, and belongs to the technical field of laser metal forming technology. Background technique [0002] Laser additive manufacturing is a rapid prototyping method that has developed rapidly in recent years. It can directly use metal powder to form high-density three-dimensional parts, and rarely requires auxiliary processes such as subsequent heat treatment strengthening or metal secondary immersion. However, since the heat source used in laser additive manufacturing technology is laser, the final quality of formed parts is closely related to the coupling effect of laser and powder. For a long time, there have been few researches on the mechanism and process control of laser and powder layer. Although many simulations of molten pool have achieved certain research results, most of the previous researches focused on the simulation...

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Problems solved by technology

For a long time, there have been few researches on the mechanism of action and process control of laser and powder layer. Although many simulations of molten pools have achieved certain research results, most of the previous researches focused on the simulation of temperature field and stress field. , by changing the processing parameters to observe the changes in the temperature field and stress field, so as to analyze and predict the impact of different processing parameters on the final quality of the formed parts, and the models established are all macroscopic, and the powder layer is regarded as a continuous and uniform medium. That is, it is equivalent to treating the powder layer as a block, without considering the influence of the special structure of the powder particle stacking

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