| 摘要: |
| 为探索出一种适用于激光粉末床熔融工艺，低成本、响应快、数据精度高的在线监测方法，本文采用熔池图像监测系统提取变能量密度试样熔池面积数值，对数值一维及二维分布进行分析，探索整体数值分布意义，建立局部数值与粉末颗粒未熔缺陷之间的关联关系，并通过试样表面样貌进行分析验证，最终得到结论：熔池面积数值可根据整体分布状态判断试样整体打印稳定性。具体熔池面积值分布情况为：大值集中分布，小值沿边缘分散分布，熔池面积小值多与未熔颗粒相关，当考虑增材制造逐层累加这一特殊性时，多层间小值方差数值也可影响未熔颗粒整体成形状态，为熔池图像面积数值监测在激光粉末床熔融工艺在线监测上提供帮助。 |
| 关键词: 激光粉末床熔融 熔池图像采集 在线监测 能量密度 |
| 基金项目: |
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| Effect of Process Parameters on the Melting Pool Geometry in Laser Powder Bed Fusion Process：A Monitoring Investigation |
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Guo Sutong1, Chen Rong1, Zhang Kai2
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1. Aerospace Additive Manufacturing Technology (Beijing) Co., Ltd., Beijing 100074;2. College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094
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| Abstract: |
| To explore a low-cost, rapid-response, and highly precise online monitoring approach for the laser powder bed fusion process, this paper employs the molten pool image monitoring system to extract the numerical value of the molten pool area of the variable energy density sample. It analyzes the one-dimensional and two-dimensional distribution of the numerical value, investigates the significance of the overall numerical distribution, establishes the correlation between the local numerical value and the unmelted defect caused by the powder particle in the sample, and validates it through the surface morphology analysis of the sample. Finally, it is concluded that the numerical value of the molten pool area can be used to judge the overall stability of the sample’s printing process based on the overall distribution state. The specific distribution of the molten pool area value is as follows: the large value is concentratedly distributed, the small value is dispersedly distributed along the edge, and the small value of the molten pool area is often related to unmelted particles. When considering the specialty of additive manufacturing, the variance of the small value between multiple layers can also affect the overall forming state of unmelted particles. This can provide help for the monitoring of the molten pool image area numerical value in the online monitoring of laser powder bed fusion process. |
| Key words: laser powder bed fusion melt pool image processing online monitoring energy density |
