Coaxial monitoring method and device in selective laser melting process

Abstract

The invention discloses a coaxial monitoring method and a device in a selective laser melting process. The device comprises a light path module, a photodiode module, a diode controller, a laser head, a COMS high-speed camera, a camera controller and a computer. Metal powder on a workbench base plate is melted selectively by a scanning galvanometer of the light path module, and molten pool radiation is reflected into the COMS high-speed camera 3 and a photodiode in the selective laser melting process; the COMS high-speed camera and the photodiode module are used for processing molten pool radiation data converted into image information transmitted to the corresponding controller; the camera controller is used for processing the image data converted into feedback information for controlling the laser; the diode controller is used for processing optical signals exempted from external electromagnetic interference, and the device is applicable for collection; in the selective laser melting process, by combining the COMS high-speed camera and the photodiode, the coaxial monitoring method is beneficial to improving the local resolution ratio and quick scanning 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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