锻压技术

基于STL模型的数控渐进成形模型姿态确定

英文标题：Determination of model posture in CNC incremental forming based on STL model

作者：朱虎张伟鞠晋

单位：沈阳航空航天大学

分类号：

出版年,卷(期):页码：2015,40(4):74-78

摘要：

针对数控渐进成形中板材件容易破裂、厚度不均问题，提出了一种基于STL (S Tereo Lithography)模型的数控渐进成形件模型姿态确定方法。在根据各三角面片的成形角大小差异对三角面片进行筛选的基础上，利用成形角和成形件厚度的关系，通过定量计算各个三角面片的成形角之差来确定模型绕X轴和Y轴的旋转角度，并调整待成形件模型姿态，进而确保各三角面片的成形角之差最小，从而实现数控渐进成形中板材件厚度的均匀化。算法应用实例表明，模型姿态调整后板材件厚度分布更加均匀且厚度差明显减小，厚度差减小幅度为0.413 mm。

For problems of the easy broken of sheet metal parts and the uneven thickness in Computer Numerical Control (CNC) incremental forming, a determination method of the model posture in CNC incremental forming based on the STL (S Tereo Lithography) model was proposed. After screening the triangular facets by different forming angles, using the relationship between the thickness of the sheet metal parts and the forming angles, and calculating the difference of forming angle of triangular facets quantificationally to determine the rotation angles of the model that rotating the X-axis and Y-axis, the model posture of sheet metal part was adjusted to ensure the minimum difference of forming angles between triangular facets and to realize the even thickness in sheet metal parts. The application examples of algorithm show that the thickness distribution becomes more even and small thickness differences are obtained after adjusting the model posture. As a result, the decreasing amplitude of thickness difference is 0.413 mm.

基金项目：

辽宁省自然科学基金资助项目(2014024011)

朱虎(1964-)，男，博士，教授

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