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针对涡轮叶片精铸蜡模壁厚的快速、低成本测量问题,提出了基于光学测量的内切圆弦长的壁厚计算方法。以陶芯和蜡模外形的光学扫描测量模型为对象,将两测量模型进行配准并提取截面数据,拟合得到蜡模内外截面轮廓线,提出并研究了两种内外截面轮廓线内切圆弦长计算方法,进而在UG平台上进行二次开发计算得到蜡模壁厚。最后,通过实验将算法的实例计算壁厚与计算机断层成像(CT)测量壁厚进行了比较分析,结果表明,基于光学测量的内切圆弦长法计算壁厚与CT测量壁厚具有很好的一致性。
Aiming at the problem of rapid and low-cost measurement of wax wall thickness of turbine blade casting mold, the calculation method of wall thickness based on optical measurement is proposed. Taking the optical scanning measurement model of ceramic core and wax pattern as the object, the two measurement models are registered and the cross-sectional data is extracted to obtain the contour lines of the wax pattern inside and outside the cross section, and the two kinds of inscribed circles Chord length calculation method, and then UG platform for secondary development and calculation of wax wall thickness. Finally, the wall thicknesses computed by the algorithm are compared with the wall thickness measured by computed tomography (CT). The results show that the calculated wall thickness and CT wall thickness based on optical measurement are very good Consistency.