Monitoring and controlling method and system of solidification structure form of laser additive manufacturing based on pictures

Abstract

The invention discloses a monitoring and controlling method and system of a solidification structure form of laser additive manufacturing based on pictures. The monitoring and controlling method of the solidification structure form of laser additive manufacturing based on pictures comprises the steps that step 1, pictures of a molten pool are collected in real time in the process of laser additivemanufacturing, and the collected pictures of the molten pool are output; step 2, the collected pictures of the molten pool are subjected to treatment, and dynamic characteristic parameters of the molten pool are obtained; step 3, a solidification structure form after the process of laser additive manufacturing is forecasted according to the obtained dynamic characteristic parameters of the moltenpool; and step 4, if the forecasted solidification structure form does not meet requirements, machining parameters in the process of laser additive manufacturing are adjusted, and thus the dynamic characteristic parameters of the molten pool are adjusted to required states. The monitoring and controlling system of the solidification structure form of laser additive manufacturing based on picturescomprises a molten pool picture collecting module, a molten pool picture processing module, a structure form forecasting module and a structure form controlling module. According to the monitoring and controlling method and system of the solidification structure form of laser additive manufacturing based on pictures, online monitoring and predictive controlling of the solidification structure form of laser additive manufacturing are achieved, and the advantages that the implement method is simple, the cost is low, the control efficiency is high, the reliability is high and the like are realized.

Description

technical field [0001] The present invention relates to the technical field of laser additive manufacturing, and in particular to a method and system for controlling solidified tissue morphology in laser additive based on image monitoring. Background technique [0002] After 30 years of rapid development, laser additive manufacturing has broad application prospects in aerospace, automobile manufacturing, petrochemical, biomedical and other fields. It has high processing integrity, fast processing speed, high structural complexity, and design The advantages of wide dimension. However, compared with the traditional subtractive manufacturing process, the structure and performance of the material are consistent. Additive manufacturing belongs to point processing, and each processing point may be affected by the deterioration of active processing conditions or changes in the passive environment, resulting in changes in structure and performance. , and in laser additive manufactu...

AI Technical Summary

Problems solved by technology

However, compared with the traditional subtractive manufacturing process, the structure and performance of the material are consistent. Additive manufacturing belongs to point processing, and each processing point may be affected by the deterioration of active processing conditions or changes in the passive environment, resulting in changes in structure and performance. , and in laser additive manufacturing, because additive manufacturing itself has the advantages of high manufacturing freedom and high structural complexity, and too high a degree of freedom will also cause the material body of additive manufacturing to be subject to fluctuations in process parameters, processing paths, and equipment Due to the influence of other factors, the uniformity of the material is poor, and there are large differences in the structure and morphology.

However, for structural and functional parts, the uncontrollability of material structure will cause uncontrollable service performance risks, which greatly limits the further engineering application of laser additive manufacturing technology.

[0003] Some practitioners have proposed that by monitoring the geometric and temperature characteristics of the deposited layer online during the additive manufacturing process, the dimensional accuracy and stress distribution of the deposited workpiece can be effectively controlled. The correlation between the physical characteristics of the deposited tissue and the morphology of the tissue after deposition, it is impossible to adjust the appropriate dynamic parameters during the processing process to regulate the tissue morphology in a timely manner

At the same time, the existing traditional analysis method of microstructure characteristics is to use destructive test for sampling analysis. This method has a certain reference for the microstructure after additive manufacturing. However, due to the high degree of freedom of material microstructure in additive manufacturing, Can not completely reproduce the coagulation structure corresponding to the intrinsic parameters

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