锻压技术

五轴数控渐进成形中挤压工具姿态的确定

英文标题：Determination on pressing tool posture in the five-axis CNC incremental forming

作者：韩福辰朱虎

单位：沈阳航空航天大学

分类号：TG335.5

出版年,卷(期):页码：2017,42(11):84-88

摘要：

在基于STL模型的五轴数控渐进成形中，为了避免三角面片边界处挤压工具的姿态发生突变现象，提出一种挤压工具姿态确定方法。首先，根据挤压工具头中心点与三角面片的位置关系，将工具头中心点分为位于三角面片顶点、三角面片边和三角面片内部3种类型；然后，对不同类型的工具头中心点，分别采用不同的距离加权算法，计算工具头中心点的法向量；最后，根据工具头中心点的法向量和挤压工具轴相对于工具头中心点法向量的引导角和倾斜角，确定挤压工具姿态。采用VC++和OPENGL完成算法的系统实现。算法应用实例表明，所确定的挤压工具姿态变化平缓，在三角面片的边界处，没有发生挤压工具姿态突变现象，软件运行稳定可靠。

In the five-axis CNC incremental forming based on STL model, in order to avoid the postural mutation of pressing tool at the edges of triangular facets, a method for determining the postures of pressing tool was proposed. Firstly, according to the position relationship between the center points of pressing tool head and the triangular facet, the center points of pressing tool head were classified into three types that were located on the vertex of triangular facet, the edges of triangular facet and the inside of triangular facet; and then the normal vector of different types of tool head center points were calculated by the algorithms with the different distance weighting algorithm respectively. Finally, the pressing tool postures were determined according to the normal vector of the tool head center points and the leading angles and inclining angles between the pressing tool axis and the normal rector of the tool head center points. The system of algorithm was implemented by VC ++ and OpenGL. The results show that the pressing tool postures are changed gently without postural mutation of the pressing tool at the boundary of triangular facet, and the operation of software is stable and reliable.

基金项目：

国家自然科学基金资助项目(51175351)

作者简介：韩福辰(1988-)，男，硕士研究生 E-mail：Hanfuchen@qq.com 通讯作者: 朱虎(1964-)，男，博士，教授 E-mail：zhuhu10@163.com

参考文献：

[1]周六如, 郑志强, 罗忠民. 工具转速对AZ31B镁合金圆锥盒摩擦热渐进成形板料温度及成形能力的影响[J]. 锻压技术, 2016, 41(9): 31-34.

Zhou L R, Zheng Z Q, Luo Z M. Influence of tool speed on sheet temperature and formability of magnesium alloy AZ31B cone box in frictional heat incremental forming [J]. Forging & Stamping Technology, 2016, 41(9): 31-34.

[2]朱虎, 李佳良, 刘一波. 三轴与五轴数控渐进复合成形[J]. 锻压技术, 2016, 41(8): 18-23.

Zhu H, Li J L, Liu Y B. CNC incremental compound forming based on three-axis and five-axis [J]. Forging & Stamping Technology, 2016, 41(8): 18-23.

[3]朱虎, 杨晓光. 五轴数控渐进成形干涉检测与修正研究[J]. 机械工程学报, 2014, 50(7): 168-175.

Zhu H, Yang X G. A study on the interference detection and correction in 5-axis CNC incremental forming [J]. Journal of Mechanical Engineering, 2014, 50(7): 168-175.

[4]杨晓光. 五轴数控渐进成形轨迹生成与干涉检查研究 [D]. 沈阳: 沈阳航空航天大学, 2013.

Yang X G. A Study on Forming Path Generation and Interference Detection for Sheet Metal 5-axis CNC Incremental Forming [D]. Shenyang: Shenyang Aerospace University, 2013.

[5]马金河, 王芊. 五坐标曲面加工与刀轴控制[J]. 机电产品开发与创新, 2007, (1): 196-197.

Ma J H, Wang Q. Five-coordinate camber processing and knife-axial controlling [J]. Development & Innovation of Machinery & Electrical Products, 2007, (1): 196-197.

[6]韩福辰. 金属板材数控渐进成形数值模拟研究[D]. 沈阳: 沈阳航空航天大学, 2014.

Han F C. A Study on Numerical Simulation for Sheet Metal CNC Incremental Forming [D]. Shenyang: Shenyang Aerospace University, 2014.

[7]Gouraud H. Continuous shading of curved surface [J]. IEEE Tans Computers, 1971, 20(6): 623-629.

[8]Taubin G. Estimating the tensor of curvature of a surface from a polyhedral approximation [A]. Proceedings of the Fifth International Conference on Computer Vision[C]. Los Alamitos, 1995.

[9]神会存, 周来水. 基于离散曲率计算的三角面片模型优化调整[J]. 航空学报, 2006, 27(2): 318-324.

Shen H C, Zhou L S. Triangular mesh regularization based on discrete curvature estimation [J]. Acta Aeronautica ET Astronautica Sinica, 2006, 27(2): 318-324.

[10]王华兵, 刘伟军, 卞宏友. 二维流形三角面片模型顶点法向量估计 [J]. 小型微型计算机系统, 2009, 30(7): 1437-1440

Wang H B, Liu W J, Bian H Y. Vertex normal vector estimation methods for manifold triangular meshes [J]. Journal of Chinese Computer Systems, 2009, 30(7): 1437-1440.

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