汽车覆盖件模具的非球头刀宽行加工方法

汽车覆盖件模具型面一般是由大面积平坦面和一定陡立面结合的构成的自由曲面.针对汽车覆盖件模具粗加工及半精加工中球头刀效率低的问题,将非球头刀的宽行加工应用于汽车覆盖件模具粗加工与半精加工过程,在工艺上使用环形刀加工陡立面,高进给铣刀加工平坦面的组合加工方式来代替普通球头刀加工,论述了高进给铣刀在加工平坦类曲面中的优势,提出了平底类刀具铣削平坦凹曲面的最小曲率半径判定原则,并对环形刀和高进给铣刀铣削区域内的刀路轨迹进行优化.最后,在三轴数控机床上进行了实验验证,实验结果表明:宽行加工工艺与球头刀加工相比可提高加工效率44.75%.

An Approach to Non-Ball-End Milling of Automobile Covering Mold with Large Machining Strip Width

Abstract：The surface of automobile covering mold is generally combined with large area of flat surface and steep surface. According to the problem of ball end cutter＇ s low efficiency during the process of the roughing and semi finishing machining of the automobile covering mold, the strip-maximization machining of non-ball-end is pro- posed in this paper. The common ball-end is replaced by the method of using the annular cutter to machine the steep elevation and using the high feed milling cutter to machine the flat surface in the process. Meanwhile, it illustrates the advantages of the high feed milling in machining flat surfaces and proposes a principle for determining the mini- mum radius of curvature of the flat-concave surface where the flat cutters can work. The tool path on the annular cutter and high feed milling area are optimized. As a result, the machining efficiency is improved. Finally, it we do an experiment with the three axis NC machine tool. Experimental results show that the strip-maximization machining can improve the processing efficiency by 44. 75 % compared with ball-end cutters machining.