To decrease bending and twist deformation of non-sym metry extruded sections, a new conception of local extrusion ratio and die band ratio has been set up, and also the formulas for the place of die hole on the ba sis of simulating test.

• 为减小非对称型材挤压的弯扭畸变,在试验研究的基础上,建立了局部挤压比、挤压带系数的概念,挤压筒中心与挤压模孔型中心相对位置的计算式。