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http://dx.doi.org/10.7234/kscm.2011.24.4.023

Comparison of Optimum Drilling Conditions of Aircraft CFRP Composites using CVD Diamond and PCD Drills  

Kwon, Dong-Jun (경상대학교 나노.신소재공학부)
Wang, Zuo-Jia (경상대학교 나노.신소재공학부)
Gu, Ga-Young (경상대학교 나노.신소재공학부)
Park, Joung-Man (경상대학교 나노.신소재공학부)
Publication Information
Composites Research / v.24, no.4, 2011 , pp. 23-28 More about this Journal
Abstract
Recently CFRP laminate joints process by bolts and nets are developed rapidly in aircraft industries. However, there are serious drawback during jointing process. Many hole processes are needed for the manufacturing and structural applications using composite materials. Generally, very durable polycrystalline crystalline diamond (PCD) drill has been used for the CFRP hole process. However, due to the expensive price and slow process speed, chemical vapor deposition (CVD) diamond drill has been used increasingly which are relatively-low durability but easily-adjustable process speed via drill shape change and price is much lower. In this study, the comparison of hole process between PCD and CVD diamond coated drills was done. First of all, CFRP hole processbility was evaluated using the equations of hole processing conditions (feed amount per blade, feed speed). The comparison on thermal damage occurring from the CFRP specimen was also studied during drilling process. Empirical equation was made from the temperature photo profile being taken during hole process by infrared thermal camera. In addition, hole processability was compared by checking hole inside condition upon chip exhausting state for two drills. Generally, although the PCD can exhibit better hole processability, hole processing speed of CVD diamond drill exhibited faster than PCD case.
Keywords
CFRP; Drilling processing; Hole; Polycrystalline Crystalline Diamond drill; Chemical Vapor Deposition diamond drill;
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