Online in situ detection of deposited height deviation during additive manufacturing

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2024-11-23 DOI:10.1016/j.optlastec.2024.112175

Wei Feng , Zhuangzhuang Mao , Heng Ma , Hongye Zhang , Yao Zhao , Kai Zhao , Chaoqi Qi , Ce Hao , Jiaqiang Li , Sheng Liu , Xin Kang , Jianxin Nie , Zhanwei Liu

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引用次数: 0

Abstract

Deposited height deviation (DHD) of printed layers is a common surface defect that restricts vertical printing accuracy during the additive manufacturing process. The accumulation of DHD layer by layer inevitably leads to the failure of subsequent additive manufacturing tasks. Therefore, accurate online measurement of DHD is crucial. This study proposed a novel amplification computer-vision measurement (ACVM) method that effectively utilizes both melt pool images and temperature information, achieving a DHD detection sensitivity of approximately 9.96 μm. Theoretical connections between image features and DHD, as well as the theoretical associations between instantaneous temperature characteristic and DHD, have been systematically deduced. Based on these two theoretical relationships, DHD can be accurately and synchronously detected directly through the positions of image features and temperature. A single-camera dual-channel multi-signal detection (SDMD) system was developed and implemented within a laser-engineered net shaping (LENS) additive manufacturing system. Subsequently, an online measuring and verification experiment was designed to assess the height deviation of thin-walled structural parts. The experimental results demonstrated that the ACVM method provided an early response to DHD. The method exhibits significant technical application value in quality control in future.

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在线原位检测增材制造过程中的沉积高度偏差

印刷层的沉积高度偏差（DHD）是一种常见的表面缺陷，会限制增材制造过程中的垂直印刷精度。逐层累积的 DHD 不可避免地会导致后续增材制造任务的失败。因此，对 DHD 进行精确的在线测量至关重要。本研究提出了一种新型放大计算机视觉测量（ACVM）方法，该方法有效利用了熔池图像和温度信息，实现了约 9.96 μm 的 DHD 检测灵敏度。系统地推导了图像特征与 DHD 之间的理论联系，以及瞬时温度特征与 DHD 之间的理论联系。根据这两个理论关系，可以直接通过图像特征和温度的位置来准确地同步检测 DHD。在激光工程网成形（LENS）增材制造系统中开发并实现了单摄像头双通道多信号检测（SDMD）系统。随后，设计了在线测量和验证实验来评估薄壁结构件的高度偏差。实验结果表明，ACVM 方法对 DHD 做出了早期响应。该方法在未来的质量控制中具有重要的技术应用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems