A DRILLING METHOD OF CFRP AND TITANIUM PLATE BY A SOLID LUBRICATING SHEET

摘要

We have studied a new dry process that combines mechanical drilling of CFRP and/or titanium plate and routing of CFRP with a solid lubricating sheet for the applications of aircraft, automotive and industry. It's solid at room temperature, which consists of water-soluble resin and lubricant. Operator puts it on the outermost of CFRP and/or titanium plate for drilling or routing. As the result of this study, it suggests that the solid lubricating sheet, compared to conventional processes, can give some advantages as below: the wear reduction of drill cutting edge, the exit-side burr reduction of the hole in titanium plate, and the accuracy of hole diameter, the splintering/delamination reduction of the routing part in CFRP is better than no lubricant process. For instance, in drilling process, the wear reduction is improved 70% at Ti-6Al-4V ELI of 3mm thick, is improved 40% at CFRP of 5mm thick (UD, aerospace grade) and Ti-6Al-4V ELI of 3mm thick stacked, is improved 23% at two panels of CFRP of 5mm thick (UD, aerospace grade) stacked. In routing process, the splintering reduction at the exit side of the tool is improved 250% at CFRP of 2mm thick.