螺旋曲面的5轴旋风式逼近铣削技术

针对螺旋曲面的快速精确成形问题,运用微分几何的法曲率原理,提出了旋风式等法曲率逼近铣削新模型。该新模型能有效地增加旋风式铣刀的切削量,提高生产效率,其技术核心是实时调整旋风式铣刀的切削进给方向,使铣刀切削刃的回转面对被加工曲面形成等法曲率的贴近包络,以极大地提高切触点处刀具在工件表面上的材料切削量。应用表明,新模型在5个坐标轴的协调动作下所获得的自由曲面成形精度高,加工质量好;在相同表面粗糙度要求的条件下,可显著缩短加工时间。

Equivalent normal curvature approaching milling model of helical surfaces

A new milling method with the equivalent normal curvature milling model machining helical surfaces is proposed based on the normal curvature theorems on differential geometry. The new milling model can efficiently enlarge the material removal volume at the tip of the whirlwind milling tool and improve the producing capacity. The machining strategy of the model is to regulate the orientation of the whirlwind milling tool relatively to the principal directions of the workpiece surface at the point of contact, so as to create a full match with collision avoidance between the workpiece surface and the symmetric rotational surface of the milling tool. The practical results show that the new milling model is an effective method in machining complex three-dimensional surfaces. This model has a good improvement on finish machining time and scallop height in machining the freeform surfaces over other milling processes.