Selective laser melting forming molten bath real-time monitoring device and monitoring method

Abstract

The invention relates to a selective laser melting forming molten bath real-time monitoring device and a monitoring method, and belongs to the technical field of 3D printing additive manufacturing. The selective laser melting forming molten bath real-time monitoring device and the monitoring method can monitor the molten bath temperature, the shape and the area in the SLM forming process in real time, conduct online assessment on the forming precision and the laser power and feed back the result. According to the adopted technical scheme, a melting forming laser system and a pulsed laser are arranged on the top of a forming cavity, a piece of transparent glass is arranged in the center of the top of the forming cavity, a laser lens tube is arranged above the transparent glass, and the pulsed laser is connected with the laser lens tube through an optical fiber. A lifting frame is arranged in the forming cavity, lifting mechanisms are arranged on the two sides of the lifting frame, and cameras are arranged at the bottom of the lifting frame in the mode of different angles. The melting forming laser system, the pulsed laser, the lifting mechanisms and the cameras are connected with a master control system. The selective laser melting forming molten bath real-time monitoring device and the monitoring method are widely used for real-time monitoring of a selective laser melting forming molten bath.

Description

technical field [0001] The invention relates to a real-time monitoring device and monitoring method for a molten pool formed by selective laser melting, and belongs to the technical field of 3D printing additive manufacturing. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, is an emerging manufacturing technology based on digital models that accumulate materials layer by layer to produce physical objects. This technology closely combines information network technology with advanced material technology and digital manufacturing technology. It is an important part of advanced manufacturing industry. 3D printing does not require cutting materials or molds. It can be mass-produced and remotely controlled. It is especially suitable for products with complex structures and very small volumes. The manufacturing speed is fast and the production cycle is short, which reduces development costs and risks. Changes in manufacturing ...

AI Technical Summary

Problems solved by technology

At present, there are relatively many studies on molten pool monitoring in the welding process, and the related technologies are relatively mature. However, in the SLM forming process, the laser scanning speed is fast, and the molten pool is affected by laser power, beam scanning speed, gas composition, and gas flow. Factors such as material performance and layer thickness are greatly affected, so the monitoring system needs to have a fast shooting speed, a large amount of data, and signal processing must be carried out. Real-time monitoring cannot be achieved with conventional monitoring settings.

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