连杆类模具终锻型腔曲面几何形状描述

GEOMETRIC DESCRIPTION OF FINISH-FORGING CAVITY SURFACE FOR CONNECTING-ROD DIE

采用双三次均匀Ｂ样条曲面方法，研究了连杆类模具型腔曲面的几何形状，提出了一种改进的处理倒角圆弧曲面的方法，给出了一种解决三角域导矢边界条件的处理方法。研究结果表明，采用Ｂ样条曲面方法描述连杆类模具型腔这种复杂曲面几何形状是可行的。该方法简便。

This paper studies the geometric description of finish-forging cavity surface for con-necting-rod die by using the double cubic uniform B-spline surface. An improved transitionpiecing method,namely the Quasi-piecing method,is proposed.A scheme is presented,which can be used for the treatment of derivative vectors of the triangular domain.It is wellshown from description that the B-spline method is desirable to describe complicated diecavity surfaces. The method will provide a good way on geometric systems of finite elementsimulation and of die′s CAD/CAM/CAE for connecting rod.