DUAL BEAM LASER GROOVING OF CFRP BY PULSED LASERS

摘要

We have been investigating micromachining of CFRPby short laser pulses in order to minimize materialdamages and HAZ. The laser system used in thisstudy was a Ti:Sapphire laser with pulsewidth of 100fs.For comparison, we also used 200ps stretched pulsesfrom the Ti:Sapphire laser and output from a 200nspulsedfiber laser. In order to overcome slowprocessing speed by ultra-short pulses, we haveproposed a novel dual beam grooving. In the firstprocess, small-energy ultra-short pulses are used to cutthe edges of the groove with multiple scanning.Secondly, high-energy long-pulses ablate the remainedpart with a single scanning. We used 1.3mm-thickuni-directional CFRP samples. Trenches with depthof 100μm and width of 50μm were machined by 200pslaser pulses. Then, 200ns fiber laser pulses werefocused on one of the remained part in a singlescanning. As a result, a groove with depth of 100 μmand width of 150 μm was formed without significantHAZ.