【摘要】 参数化建模和数据的存贮管理是系列化产品结构ＣＡＤ的两个关键技术问题。本文重点研究参数化建模，根据结构设计原则提出结构尺寸分类方法，并对不同类型尺寸建立不同设计约束及修改属性。以尺寸设计模型为基础，通过逻辑组合形成零部件设计模型。这一参数化建模方法已在液压挖掘机结构ＣＡＤ中得到成功的应用。更多还原

【Abstract】 Abstract Parametric modelling ,storage and managementof data are two key technical problems of structural CADfor seriate products. This paper studied emphatically onparametric modelling, put forward the classifying methodof structural dimensions according to the principle of struc-tural design and established different designing restraintand modification of attribute. Take the designing model ofdimensions as a foundation and by means of logical conbi-nation to form the disigning model of parts and assembliesof machines. This parametric modelling method has gaineda successful application on the structural CAD of hydraulicexcavator.更多还原