Modern Manufacturing Engineering ›› 2025, Vol. 540 ›› Issue (9): 139-145.doi: 10.16731/j.cnki.1671-3133.2025.09.018

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STL model-based ultrasonic C-scan detection of additively manufactured curved metal components

HE Yu, LÜ Duo, HU Hongwei, LIU Zhiping, LI Zimei   

  1. College of Mechanical and Vehicle Engineering,Changsha University of Science and Technology,Changsha 410114,China
  • Received:2025-03-21 Online:2025-09-18 Published:2025-09-23

Abstract: Additively manufactured metal components have important applications in the field of high-end equipment,but their manufacturing process is prone to porosity,cracks and other defects. The conventional ultrasonic C-scan method is difficult to stably detect defects due to the complex curved surfaces of additively manufactured components.An ultrasonic C-scan detection method for additively manufactured curved metal components based on the STereoLithography (STL) model was proposed. The normal vector parameters of the detection points on the workpiece surface required by ultrasonic scanning were extracted from the STL model of the additively manufactured components,and the scanning point coordinates were determined by the equal-arc length discrete method to realize the position finding of ultrasonic probes. A laser sintering additive manufacturing process was used to manufacture the titanium alloy test block with the aero blade profile,and C-scan experiments were conducted using a multi degree of freedom ultrasonic scanning system. The experimental results show that the STL model driven ultrasonic C-scan method effectively detects several typical additive manufacturing defects with sub millimeter sizes. However,there are deviations in the quantitative results of defect size based on C-scan images.

Key words: additive manufacturing, STL model, curved components, ultrasonic C-scan

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