S134021 Measurement of hole bottom surface temperature in drilling of CFRP/Ti stacks

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  • S134021 CFRP/Ti積層板のドリル加工面温度測定

Abstract

Carbon reinforced plastics (CFRP) is increasingly being used in the aerospace industry because of the high strength-to-weight ratios. Material stacks comprising CFRP and titanium alloy are used for structures for aerospace applications, where high mechanical loads exist. Drilling is used to make holes for fastening the composites by bolting. The drilling temperature effects on the hole quality. In this study, the hole bottom surface temperature during drilling of CFRP/Ti composite is measured by using an infrared radiation pyrometer with an optical fiber. The optical fiber is inserted in the oil hole of carbide drill to measure the temperature. In the drilling of CFRP/Ti, the temperature is about 80 °C during drilling of CFRP, and the temperature rapidly increases to 270 C at the beginning of the drilling of titanium and it increases to 750 °C at the exit side of titanium. In the drilling of Ti/CFRP, the temperature is about 170 C at the beginning of the drilling of titanium and it increases to 700 °C at the exit side of the titanium, and the temperature is about 180 °C during drilling of CFRP.

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