离心式三元叶轮焊接坡口五轴加工刀位算法

Five-Axis CNC Machining Cutter Location Algorithm for Welding Groove of Centrifugal 3-D Impeller

根据三元叶轮焊接坡口大多采用手工修磨方法加工的现状和某企业对焊接坡口加工的图纸要求,首先将叶片中性面盖盘曲线拟合为NURBS曲线,并对其进行离散处理。再根据切削平面内圆柱铣刀与坡口的几何关系,开发出圆柱铣刀五轴侧铣加工三元叶轮焊接坡口的刀位算法。经仿真与试切加工,完全满足图纸要求。本算法不仅适用于两件焊式三元叶轮,同时适用于手把焊式二元叶轮和开槽焊式二元叶轮焊接坡口的五轴侧铣数控编程。实现了叶轮类零部件焊接坡口的数控加工,可有效的提高叶轮的加工精度和加工效率,提升焊接后叶轮的强度,并极大的减轻了操作工人的负担。

According to the current situation of that most welding groove of 3-D impeller are made by manual grinding and the drawing requirement for the machining of welding groove of an enterprise.The shroud curve of the blade neutral surface is fitted into the NURBS curve firstly and the discrete processing is done.Then according to geometrical relationship between the cylindrical milling cutter and the welding groove in the cutting plane,the 5-axis side milling cutter location algorithm for the welding groove of 3-D impeller is developed.Through cutting simulation and test cutting,it can fully meet the requirement specified in the drawing.The proposed algorithm is not only suitable for the two piece welded 3-D impeller,but can also be applicated to the 5-axis side milling CNC programming of the hand-held welded and the slotting welded 2-D impeller.It realized the CNC machining of the welding groove of impeller parts,the manufacturing precision,manufacturing efficiency of impeller and the strength of impeller after welding can be effectively improved,meanwhile,the work load of the operating workers is greatly reduced.