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Sa, Min-Woo
- Journal of the Korean Society of Manufacturing Process Engineers
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- v.19 no.3
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- pp.8-13
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- 2020
Carbon fiber-reinforced plastics (CFRPs) are extremely strong and light fiber-reinforced plastics containing carbon fibers. CFRPs can be expensive to produce, but are commonly used wherever high strength-to-weight ratio and rigidity are required, such as in the aerospace, automotive, and ship superstructure industries. In CFRP drilling, the tool performance greatly varies depending on the tool shapes, cutting conditions, and diamond coating. This study developed a new type of tungsten carbide drill with multi-blade edges to evaluate the surface quality of CFRP materials according to the coating thickness of diamond-coated drills. Experiments on tool wear, surface roughness, and burr formation were conducted. The bore exit quality of a 12 mμ -coated drill was better than that of a 6 mμ -coated drill. The superior effects of the 12 mμ -coated drill and the good surface quality of CFRP were also demonstrated.
https://doi.org/10.14775/ksmpe.2020.19.03.008 인용 PDF KSCI

Cha, Seung-hwan;Ha, Byeong-Cheol;Yang, Dong-Ho;Park, Shang-Hyun;Lee, Jong-Chan
- Journal of the Korean Society of Manufacturing Process Engineers
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- v.19 no.3
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- pp.105-110
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- 2020
Alumina, a typical ceramic material used for semiconductors and display parts, is the subject of research and development efforts for mineral material processing. Alumina is extremely difficult to process since it is brittleness to either fine ceramics material. We have studied the shape of diamond particles and their use in machinability for alumina processing. Our study was carried out under various processing conditions, including cutting speed, table speed, and the surface roughness of the work piece. We also analyzed the wear characteristics of the tool by total cutting.
https://doi.org/10.14775/ksmpe.2020.19.03.105 인용 PDF KSCI

Han, Eung-Kyo;Rho, Byung-Ok;Park, Du-Won;Kim, Jong-Ock
- Journal of the Korean Society for Precision Engineering
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- v.8 no.3
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- pp.105-113
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- 1991
The practicability of Ion-Sputter machining renders it possible to make diamond stylus for surface roughness measurement with micro stylus tip radius less than 2${\mu}mR$, and to measure surface roughness of fine-machined surface. In this study, we researched the wear or Ion-Sputtered stylus with 0.1${\mu}mR$ and 0.5${\mu}mR$ for micro-figure measurement and polished stylus with 0.5${\mu}mR$ according to measurement distance. As a result, we know that the case of Ion-Sputtered stylus is worn down easilier the case of polished stylus. And we know that in the evaluation of stylus wear, it is more useful method that examine the wear by measuring the variation of stylus tip radius than by evaluating the variation of Ra values.
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