【摘要】 针对船用螺旋桨设计时给出的切面型值点,采用三次均匀B样条拟合技术,得到了螺旋桨叶面和叶背的拟合曲面.针对目前螺旋桨加工中存在的加工精度和效率较低、需多次装夹、适用范围有限等缺点,在分析螺旋桨桨叶曲面特征的基础上,提出了基于圆柱形刀具二阶密切加工螺旋桨的方法.采用这种方法,工件只需一次装夹,即可完成全部表面的加工;同时由于刀具与桨叶曲面保持二阶密切,在保证加工精度的前提下可以显著提高加工效率.该法尤其适用于大盘面比螺旋桨的加工.更多还原

【Abstract】 For the design data points on different cylindrical sections of a marine propeller,the fitting method of the cubic uniform B spline is applied to obtain the fitting surfaces of marine propeller.Aiming at the disadvantages of the present machining method of the propeller,such as lower machining precision and efficiency,needing more time of clamping and limited machining scope,a new machining method — the second order osculating machining method has been presented and used in the manufacture of the propeller by analyzing the curve surface characteristics of the marine propeller blade.By using this method,the cylindrical cutter and the machined surface can keep line contact,and the propeller can be machined at one time clamping.It′s very suitable for the machining of the propeller with larger projected area ratio and the machining precision and efficiency could be improved remarkably.更多还原