模面设计中复杂曲面G1稳定延伸算法  

G1 stable extension algorithm on complex surface in die surface design

作　　者：姚兵[1] 柳玉起[1] 章志兵[1] 王振[1] 张希磊 Yao Bing;Liu Yuqi;Zhang Zhibing;Wang Zhen;Zhang Xilei(State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与模具技术国家重点实验室,湖北武汉430074

出　　处：《锻压技术》2024年第8期47-52,共6页Forging & Stamping Technology

摘　　要：提出一种基于边界特征的复杂曲面延伸算法和基于曲面跨界切向的双向蒙皮曲面方法,实现了复杂曲面稳定的G1延伸创建。该算法通过利用边界特征实现延伸曲面与原始曲面保持随形,提高了曲面质量。采用蒙皮曲面和填充曲面混合方式分段构造延伸曲面,解决了复杂曲面延伸容易产生的重叠、褶皱等问题,提高了曲面延伸的稳定性。提出了基于曲面跨界切向的双向蒙皮曲面方法,保证了延伸边界处曲面的G1连续性。基于NX平台开发了边界延伸功能,实现了模具曲面边界的自动化延伸。经实际测试,该算法具有稳定可靠、自动化程度高、曲面质量好的优点,可有效缩短整个模面的设计周期。A complex surface extension algorithm based on boundary features and a bidirectional skinning surface method based on boundary derivatives were proposed,and the stable creation of G1 extension for complex surface was achieved.Then,the algorithm realizes the conformal relationship between extension surface and original surface by using boundary features,and the quality of surface is improved greatly.Furthermore,the extension surfaces in segments are constructed by the hybrid strategy of skin and fill surfaces to overcome the problems of overlapping and wrinkling that were prone in the complex surface extension,and the stability of extension surface is greatly improved.In addition,the bidirectional skinning surface method based on boundary derivatives was proposed to ensure G1 continuity of surface at the extension boundary.Based on platform NX,the boundary extension function was developed,and the automatic extension of die surface boundary was realized.The actual test results show that the proposed algorithm has the advantages of stability,reliability,high degree of automation,and good surface quality,which can effectively shorten the design cycle of the entire die surface.

关 键 词：曲面延伸 边界特征 自动分段 蒙皮曲面 G1连续 

分 类 号：TG386.3[金属学及工艺—金属压力加工] TP319[自动化与计算机技术—计算机软件与理论]