基于正向杜邦指标线的五坐标侧铣加工

为实现叶轮类零件的多坐标侧铣加工，通过引入正向杜邦指标线，利用鼓锥形刀对自由曲面的五坐标侧铣加工进行研究。针对具有严格凸切削刃的侧铣加工刀具，提出不发生局部干涉的充要条件是切触点处刀具曲面的正向杜邦指标线位于被加工曲面的正向杜邦指标线之内。给出利用鼓锥形刀侧铣加工自由曲面时实施干涉检查的判断准则以及消除干涉的修正方法，推导出具有严格凸切削刃的刀具在给定的残留高度下侧铣加工带宽的计算方法。在此基础上，利用等残留高度法实现鼓锥形刀侧铣加工自由曲面无干涉刀具轨迹的生成。算例表明，在相同残留高度下，鼓锥形刀侧铣较之球头刀加工效率提高37.44%，说明侧铣加工是提高切削效率和加工质量的一种有效途径。

5-AXIS FLANK MACHINING SCULPTURED SURFACES BASED ON SIGNED DUPIN INDICATRIX

For the purpose of multi-axis flank machining of impellers,a new method for 5-axis flank machining sculptured surfaces with a drum-taper type cutter based on the signed Du- pin indicatrix is presented.As to the cutter with the strictly convex cutting surface,the necessary and sufficient condition for gouge-free 5-axis surface flank machining is proposed, which is that the signed Dupin indicatrix of the cutter is con- tained in the indicatrix of the part surface at the cutting contact point.Moreover,the implementation of gouging detection and correction using the drum-taper type cutter is detailed in the context.For a given scallop height,the paper also provides an approach to calculate the machining strip width.Hereby,the tool path generation procedure with the iso-scallop method is discussed for 5-axis flank milling sculptured surfaces.The test result shows that the machining efficiency of flank milling us- ing drum-taper type cutter is improved by 37.44% comparing with ball end milling at the same scallop height.It suggests that flank machining is an effective means for improving machining efficiency and quality.