Study on construction of freeform feature models with attachment and validity maintenance

This paper introduced the freeform feature modeling in HUST-CAID,defined classification and parameters combining with the HUST-CAID system(computer aided industry design system developed by Harbin University of Science and Technology),creating a freeform feature by this classification and parameterization.On the basis of configuration of FFDP,put forward a framework for attaching freeform feature.The framework can make freeform feature model be parameterization.Then,on the basis of the framework,this paper researched a validity maintenance for the freeform feature with attachment,which could keep the validity of freeform feature with attachment.