| 摘要 |
PCT No. PCT/GB86/00751 Sec. 371 Date Jul. 13, 1987 Sec. 102(e) Date Jul. 13, 1987 PCT Filed Dec. 9, 1986 PCT Pub. No. WO87/03522 PCT Pub. Date Jun. 18, 1987.A process is described for the production of holes having curvilinear paths in engineering components. The process comprises the steps of producing relative motion along a curvilinear path between a workpiece in which it is desired to form a curved hole and a drill bit wherein the drill bit comprises a curved delivery tube of an ECM apparatus, the curved tube passing through an aperture in a guidance member which is positioned adjacent the workpiece, the aperture length being less than the diameter of the tube. An example is described of the production of curved holes in a gas turbine engine blade.
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