内燃机燃烧室芯头反求设计的CAD/CAM技术研究  

Research on CAD/CAM technology of reverse design in a combustion chamber casting core

作　　者：张红兵[1] 杜建红[1] 况定科 

机构地区：[1]苏州职业大学CAD/CAM中心,苏州215011 [2]重庆长安汽车集团股份有限公司,重庆630000

出　　处：《机械设计与制造》2003年第5期44-46,共3页Machinery Design & Manufacture

摘　　要：以某发动机燃烧室铸造芯头为研究对象,采用非接触式光电测量技术获得了七万多个数据点,并对测量数据进行了预处理;运用CAD技术对散乱数据点进行了NURBS曲面拟合和光顺处理,生成了结构的三维实体模型;采用CAM技术对该芯头的数控加工技术进行了研究,编制了NC代码,加工出了符合要求的产品模型,成功的为某汽油机燃烧室的改进定型提供了技术指导。在此基础上生成的CAD/CAM软件系统可以应用于其它复杂曲面产品的反求工程。In this paper, a core used in casting combustion chamber is analyzed. More than 70 thousands data-points are obtained by untouched measurement. The interface program is edited to deal with these data. The NURBS method is used to smooth curved-surface connection. Three-dimensional model is generated. On the base of these, NC code is programmed and suitable wax mock-up is machined. These successfully instruct to improve type of combustion chamber of gasoline engine. The system of CAD/CAM used in this research is suited for reverse research of others curved surface.

关 键 词：内燃机 燃烧室 芯头 反求设计 CAD CAM 光电测量 反求工程 曲面重构 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程] TP391.7[自动化与计算机技术—计算机应用技术]