零件模型的铸件毛坯自动生成方法
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摘要
针对在铸件毛坯生成特征识别过程中交叉特征识别不够理想的问题,提出先通过检索和变化零件属性面邻接矩阵中的元素来识别简单特征特征,然后采用对具有公共面的简单特征进行合并、对没有公共面的简单特征计算其空间是否相邻的方法来识别相交特征。对于较小特征的去除顺序问题,通过建立相交特征的依存关系,先去除依存于其他特征的特征,再去除被依存特征。最后对有较高要求的表面增加加工余量,自动选择或由用户选择分型面,生成拔模斜度。实验结果表明,对于常见模型,该方法可以生成合理的铸件毛坯。
For the problem of recognition unsatisfactory of intersected features,the member value of extended attributed adjacency matrix was indexed and changed,the features with common surface were merged,and the features with no common surface were recognized by calculating whether their outlines had adjacent.For the order of removing small features,the depending features were first removed and then the depended features by building relationship between intersected features.The machining allowances on surfaces with higher requirements was added,and the split face was automatically selected or selected by users,thus the draft?angle was generated directly.The examples were demonstrated to verify the validity of the proposed method.
For the problem of recognition unsatisfactory of intersected features,the member value of extended attributed adjacency matrix was indexed and changed,the features with common surface were merged,and the features with no common surface were recognized by calculating whether their outlines had adjacent.For the order of removing small features,the depending features were first removed and then the depended features by building relationship between intersected features.The machining allowances on surfaces with higher requirements was added,and the split face was automatically selected or selected by users,thus the draft?angle was generated directly.The examples were demonstrated to verify the validity of the proposed method.
引文
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[2] WAKHARE M,ORMAZ D.Sequencing of setups in automated setup and fixture planning[J].Procedia Manufacturing,2016,5:41-57.
[3] XU Tongming,CHEN Zhuoning,LI Jianxun,et al.Automatic tool path generation from structuralized machining process integrated with CAD/CAPP/CAM system[J].International Journal of Advanced Manufacturing Technology,2015,80(5/6/7/8):1097-1111.
[4] HUANG Rui,ZHANG Shusheng,BAI Xiaoliang.Manufacturability driven interacting machining feature recognition algorithms for 3DCAD models[J].Journal of Computer-Aided Design&Computer Graphics,2013,25(7):1089-1098(in Chines).[黄瑞,张树生,白晓亮.可制造性驱动的三维CAD模型相交制造特征识别方法[J].计算机辅助设计与图形学学报,2013,25(7):1089-1098.]
[5] ABOUELNASR E S,KAMRANI A K.A new methodology for extracting manufacturing features from CAD system[J].Computers&Industrial Engineering,2006,51(3):389-415.
[6] SHI Jianfei,Li Yingguang,LIU Xu,et al.Rib feature recognition method for aircraft structural parts base on vertex attributed adjacency graph[J].Computer Integrated Manufacturing Systems,2014,20(3):521-529(in Chinese).[施建飞,李迎光,刘旭,等.基于属性边点图的飞机结构件筋特征识别方法[J].计算机集成制造系统,2014,20(3):521-529.]
[7] TANG Xiaowei,CHEN Zhengming,GENG Weizhong.Generation of rough model from design feature model for cast-thenmachined parts[J].Journal of Computer-Aided Design and Computer Graphics,2014,26(7):1184-1192(in Chinese).[唐潇伟,陈正鸣,耿维忠.基于特征模型的铸件毛坯自动生成方法[J].计算机辅助设计与图形学学报,2014,26(7):1184-1192.]
[8] JOSHI S,CHANG T C.Graph-based heuristics for recognition of machined features from 3Dsolid model[J].Computer-Aided Desigh,1988,20(2):58-66.
[9] GAO Shuming,SHAH J J.Automatic recognition of interacting machining features based on minimal condition sub-graph[J].Computer-Aided Design,1988,30(9):727-739.
[10] LIU Xiaojun,NI Zhonghua,CHENG Yalong,et al.Machining feature recognition method for machining process facing plate parts[J].Computer Integrate Manufacturing Systems,2013,19(12):3130-3138(in Chinese).[刘晓军,倪中华,程亚龙,等.面向板腔类零件机加工艺的加工特征识别方法[J].计算机集成制造系统,2013,19(12):3130-3138.]
[11] LIU Xuemei,JIA Yongqi,CHEN Zurui,et al.Recognition of machining feature for engine cylinder blocks[J].Computer Integrate Manufacturing Systems,2016,22(5):1197-1204(in Chinese).[刘雪梅,贾勇琪,陈祖瑞,等.缸体类零件加工特征识别方法[J].计算机集成制造系统,2016,22(5):1197-1204.]
[12] ABOUEL NASR E S,KHAN A A,ALAHMARI A M,et al.A feature recognition system using geometric reasoning[J].Procedia CIRP,2014,18:238-243.
[13] WAN Neng,GOU Yuanjie,MO Rong.A new feature recognition design method for MBD rough model[J].Journal of Computer-Aided Design&Computer Graphics,2012,24(8):1099-1107(in Chinese).[万能,苟园捷,莫蓉.机械加工MBD毛坯模型的特征识别设计方法[J].计算机辅助设计与图形学学报,2012,24(8):1099-1107.]
[14] CHANG Zhiyong, WEI Haifeng,YANG Jianxin,et al.Generation of casting model for cast-then-machined parts[J].Journal of Mechanical Engineering,2012,48(8):60-66(in Chinese).[常智勇,卫海峰,杨建新,等.铸件毛坯模型生成方法研究[J].机械工程学报,2012,48(8):60-66.]
[15] GENG Weizhong,CHEN Zhengming,HE Kunjin,et al.Feature recognition and volume generation of uncut regions for electrical discharge machining[J].Advances in Engineering Software,2016,91(C):51-62.
[16] GAO Shuming.A survey of automatic feature recognition[J].Chinese Journal of Computers,1998,21(3):271-288(in Chinese).[高曙明.自动特征识别技术综述[J].计算机学报,1998,21(3):271-288.]
[17] LI Xinya.Casting manual[M].Beijing:China Machine Press,2011:107(in Chinese).[李新亚.铸造手册[M].北京:机械工业出版社,2011:107.]