【摘要】 3D打印计算机辅助设计(CAD)模型转换标准三角形语言(STL)文件过程中,存在表面精度下降,结构体信息丢失的问题.文中提出一种基于CAD模型外轮廓线的自适应分层方法.即采用角度分组思路,通过引用一系列过Z轴的平面对CAD模型等转角剖切,并将剖切面与模型外表面相交轮廓线绕Z轴旋转至XOZ平面内进行轮廓线微分段处理,然后利用三角函数关系、概率统计方法、加权方法综合计算获得3D打印STL文件每一层的自适应分层厚度值.打印实例分析结果表明,文中算法可减少STL文件的转换误差,提高3D打印精度和打印效率.更多还原

【Abstract】 In the process of converting CAD( Computer Aided Design) models into STL( Standard Triangular Language) models in three-dimension( 3 D) printing,there exist such problems as reduction of surface accuracy and loss of structure information. In this paper,a adaptive layered method is proposed based on the contour line of CAD models,with an approach of angle grouping,by referring to a series of planes containing Z axis to cut CAD models with equal turning angle,rotating the intersecting contour lines of cutting planes and model surfaces to XOZ plane around the Z axis,and dividing the contour lines into differential segments,applying trigonometric function relations,probability and statistic method,and weighting to calculate the adaptive layered thickness of each layer for 3 D printing STL files. The results of model printing show that the algorithm can reduce conversion error of STL files,improve printing accuracy and printing efficiency of 3D printings.更多还原