This paper introduced setting up the parametric expressions, and how to creating the helical curve and unwrapping the curve on the plane based on UG by the parametric unwrap equation of concrete-mixer drum logarithm helical curve.

• 推导出搅拌运输车搅拌筒对数螺旋线平面展开方程,用UG的参数表达式来实现螺旋线和在平面上展开曲线的生成。