摘要
以三维造型理论为指导,引入虚实体的概念。区别于传统读图的形体分析法和线面分析法,组合体既然是体与体的叠加和切割,分析时应以体为着眼点。叠加的形体称为实体,切割掉的体称为虚体。根据简单体投影特点,分析三视图或两视图均以线框入手,线框对应线框即为一个实体或虚体。根据主视图中特征投影分形区,对照投影,采用由大而小,由外而内,人为剥离,假想增补的方法,应用左前上优先,相错画线,共面弥合,相切无线的步骤,对组合体视图进行分析。
Guided by the theory of 3 D modeling,this paper introduces the concept of virtual-entity.Different from the conventional shape analysis method and line-surface analysis methods,the new method considers that since combined solids are made by way of superposition and cuttings,analysis shall focus on body shapes.A superimposed form is called an entity,and a cut part is called a virtual entity.According to the characteristics of simple bodies’projections,line frames in three views or two views are analyzed by line frame,and a pair of matched line frames indicates an entity or a virtual entity.According to the characteristics of the main view of the fractal projection area,projections are compared,and the combined solids views are analyzed adopting the ways of from large to small,from outside to inside,purposely stripping,and imaginatively augmenting are adopted,then following the steps of giving priority to the application of left front,staggered draw lines,co-planar bridging,and discarding line in tangent.
作者
曲焱炎
宫娜
李平川
QU Yan-yan;GONG Na;LI Ping-chuan(School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001)
出处
《机械设计》
CSCD
北大核心
2021年第S02期24-28,共5页
Journal of Machine Design
基金
黑龙江省教育科学规划“省重点课题”——新工科环境下大学生自主创新能力培养体系研究(GJB1320069)
关键词
组合体
读图
三维建模
虚实体
特征投影
投影线框
composite solids
reading composite solids
3D modeling
virtual entity
featured projection
projection line frame
作者简介
曲焱炎(1971-),男,讲师,博士,主要研究方向:机械设计及理论、工程图学、机械CAD。E-mail:quyanyanhit@126.com
