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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.
Key words: Al-Ti compound plates Drilling Surface quality
CLC No: TG
50
中国国家留学基金委员会、汉堡工业大学和戴姆斯—克莱斯勒公司资助项目.
Received 20010625, received in revised form 20020011120
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