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口腔修复体的CAD/CAM技术要求有高速数控加工设备实现。该文研究了口腔修复体的表面特征,提出了应用三次均匀B样条插补算法实现高速数控加工要求。引入B样条曲线的“重叠拼接”概念,研究了重叠型值点数与曲线光滑性的关系;提出了考虑曲线曲率变化确定速度“规划单元”长度的解决方案;讨论了跨单元插补、规划单元终点处理的特殊问题。该文成果已经应用于自行研制的口腔修复体数控加工设备上。实验结果表明,该算法在速度和精度上能够满足口腔修复体的加工要求。
Dental prosthesis CAD / CAM technology requires high-speed CNC machining equipment to achieve. In this paper, the surface features of oral prosthesis are studied, and the application of cubic B-spline interpolation algorithm to realize high-speed CNC machining is proposed. This paper introduces the concept of “overlapping splicing” of B-spline curves, and studies the relationship between the number of overlapped points and the smoothness of the curve. A solution is proposed to determine the length of “planning unit” considering the curvature of the curve. Interpolation, planning unit end-point special problems. The results have been applied to self-developed oral prosthesis numerical control processing equipment. Experimental results show that the algorithm can meet the processing requirements of oral prosthesis in terms of speed and accuracy.