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为了优化数控渐进成形方向,需要旋转调整数字模型的姿态,使其按照所希望的某一成形方向重新定向和定位,然而这会导致模型底面与定位面脱离,二者之间出现曲面缺少的问题。提出了基于STL(Sterolithography)模型的区域填补算法(模型底面和定位面之间空缺填补),即依据模型底面边环上点的切向量将模型底面边环投影至定位面并确定填补区域在定位面上的三角网格化区域,在对区域三角网格化的基础上运用最小二乘法进行了曲面拟合进而生成填补曲面。算法应用实例表明,此算法快速有效,生成的填补曲面平滑连续。
In order to optimize the numerical control progressive forming direction, it is necessary to rotate and adjust the posture of the digital model so as to be redirected and positioned according to a desired forming direction. However, this causes the bottom of the model to be separated from the positioning surface, . A region filling algorithm based on the STL (Sterolithography) model is proposed (the gap filling between the bottom surface and the positioning surface), that is, the edge of the bottom surface of the model is projected to the positioning surface according to the tangent vector of the points on the edge of the bottom surface of the model, Triangular meshing area on the surface, based on the regional triangle meshing using least square method for surface fitting to generate the surface to fill. The application of the algorithm shows that this algorithm is fast and efficient, and the generated surface is smooth and continuous.