【摘要】 介绍了汉堡工业大学采用最小冷却液法钻削多种复合板的研究结果。研究表明,在钻削铝-钛多层复合板时,钻削钛板切屑的摩擦磨损作用,会导致铝板的孔呈喇叭形,孔径波动幅度和平均孔径值增大并可能超出允差。试验采用了最小量冷却液技术,所用的3种冷却液对钻削孔径影响不大。使用涂层刀具加工时,钻削孔径同进给速度呈正比。钻头顶角越大,铝板的孔径越大,但钛板的孔径不变。为保证加工孔径质量,采用退刀排屑和扩孔方式加工,减小刃带宽度,增大进给前角和使用阶梯钻头。更多还原

【Abstract】 The Al-Ti plates are used as the major structure material of airplane now. Drilling must be done before the plates are riveted to airplane. In this report some research works in the field of Al-Ti plates dry drilling by means of MMS (Minimalmengenkühl-schmierung) method performed by Institute of Cutting Technology, Technical University Hamburg-Harburg are introduced. The Al-Ti plates with different compound structures are tested by various cutting conditions such as coolant (fatty alcohol mix, oil), tool geometries (rake angle, top angle, etc.), tool coating (uncoated and TiCN coating), feed and drilling processes (stepped drill, pre-drilling, unloading drilling) etc. The results show that the coolants used in the experiments will not affect the hole diameter, but the hole diameter will be proportional to feed when coated drillers are used. The top angle of drill will affect the hole diameter. The cutting chips of Ti plates show as continuous chips with serration. Because the chips of Ti plate scratch and rub the surface of Al plate hole, the hole diameter of Al-plates will be larger and irregular than Ti plates with normal drilling process. In general the surface quality and hole diameter of the Al plate located near the first Ti plate will be the worst and the largest. When narrow cutting edge, large feed rake angle, stepped drilling or reaming are used, the hole diameter can be limited in permitted zone.更多还原