环形刀高度变化刀路轨迹规划方法

为提高汽车覆盖件模具加工效率,将环形刀应用于汽车模具小曲率面的半精及精加工过程.通过对三坐标铣削小曲率面的刀具切触几何分析,确定环形刀最佳进给方向应沿工件高度变化方向,此时可使有效切削带宽达到最大.基于此结论,分别对两类特殊型面进行了刀路轨迹规划.对于单一方向曲率变化面采用垂直截面法,截面方向沿最大主曲率方向,实验表明:垂直截面法与等高线法相比可提高加工效率25%,并且有较好的表面质量;对于圆鼓面采用放射精加工方法,仿真结果表明:此方法与三维偏置方法相比可提高加工效率22.64%,并且避免了周边欠切.

The Tool Path Planning Method of Height Changing for Torus Cutter

In order to improve the processing efficiency of automotive covering molds,the torus cutters are used in the process of semi-finishing and finishing of small curvature surface.Through the tool contact geometric analysis of 3-aixs machining smal-curvature surface,it determines that the optimal cutter feed direction is alone the direction of the workpiece height changing,which can maximize effective cutting interval.Based on the conclusion,tool path planning is done for two kinds of special surface.Vertical section method is used for the single-direction-curvature changing surface,and the section is along the direction of maximum principal curvature.The experiment shows that the vertical section method can improve the machining efficiency by 25％,compared with the contour method,and good surface quality is generated.Radiation finish machining method is adopted on the round-drum surface,the simulation result shows that this method can improve the machining efficiency by 22.64％,compared with the three-dimensional offset method,and can avoid the surrounding owe cut.