Process monitoring system for laser precision forming technology and monitoring method thereof

Abstract

The invention provides a process monitoring system for a laser precision forming technology. The process monitoring system comprises an oxygen sensing monitoring module, a temperature monitoring module, an optical monitoring module, a powder bed monitoring module and a central control system. Compared with the prior art, the process monitoring system has the beneficial effects that 1, more process information is acquired, and process phenomena of the laser precision forming technology are better understood; 2, the quality of laser precision formed parts is improved, and internal defects of the parts are decreased; and 3, closed-loop control of the laser precision forming process is established, and intelligence of laser precision forming is achieved.

Description

technical field [0001] The invention relates to a process monitoring system for laser precision forming technology and a monitoring method thereof, belonging to the technical field of laser 3D printing. Background technique [0002] Laser 3D printing precision forming technology is based on the 3D CAD model, using special software to slice and layer the model according to a certain thickness, and input the slice layer data into the precision forming printing equipment. After the precision forming and printing equipment interprets the slicing data, the laser beam is used to melt and print the bondable materials such as powdered metal or plastic layer by layer, and finally construct a three-dimensional solid product. [0003] As layer after layer is melted and solidified rapidly during laser precision forming, the part undergoes a complex thermal evolution involving directional heat transfer. Some alloy parts may even experience repeated solid-state phase transformations. Th...

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Problems solved by technology

However, due to problems such as long-term use or smoke pollution, the laser power weakens and the spot fluctuates greatly. Due to the absence of monitoring and control measures, the powder cannot be completely melted, resulting in poor fusion and pore defects inside the part, which affects the part. quality and performance

[0006] (3) The flatness of the powder bed after each layer of powder and whether it is completely powdered, the local high point area of ​​the part is not completely melted or the local lack of powder meat, resulting in the failure to form normally and smoothly, thus affecting the quality and performance of the part

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