Coaxial monitoring method and device for laser selective melting process

Abstract

The invention discloses a coaxial monitoring method and device for a laser selective melting process, comprising an optical path module, a photodiode module, a diode controller, a laser head, a CMOS high-speed camera, a camera controller and a computer. The scanning galvanometer of the optical path module controls the laser beam to selectively melt the metal powder on the worktable substrate, and reflects the molten pool radiation into the COMS high-speed camera 3 and the photodiode during the selective laser melting process; the COMS high-speed camera and the photodiode die are used for processing The molten pool radiation data is converted into image information and transmitted to the corresponding controller; the camera controller is used to process the image data and converted into feedback information to control the laser; the diode controller processes the optical signal and is free from external electromagnetic field interference, which is suitable for acquisition; The coaxial monitoring method combined with CMOS high-speed camera and photodiode during selective laser melting is beneficial to obtain high local resolution and fast scan rate.

Description

technical field [0001] The invention relates to real-time monitoring of laser selective melting, in particular to a method and device for coaxial monitoring of laser selective melting process. Background technique [0002] Selective Laser Melting (SLM) technology is a 3D printing technology that can directly form high-density, high-precision metal parts. Its working principle is that the laser beam selectively melts the metal powder materials of each layer, and gradually stacks them into three-dimensional metal parts. Before the laser beam starts to scan, the powder spreading device first pushes the metal powder onto the substrate in the processing chamber, and then the laser beam will selectively melt the powder on the substrate according to the contour information of the current layer, and process the contour of the current layer. Layers are processed until the entire part is formed. [0003] During the entire process of selective laser melting, the forming quality of pa...

AI Technical Summary

Problems solved by technology

The main issue addressed by quality monitoring is the variability in the interaction of 3D printing equipment or lasers with the material, which in turn disturbs the microstructure or macromechanical properties of the metal

This type of traditional off-axis inspection has a lower resolution and detection rate, and cannot describe the melt pool in finer detail

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