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AIN-hBN계 머시너블 세라믹스의 기계적 특성 및 엔드밀링 가공성 평가
백시영,조명우,조원승,Beck, Si-Young,Cho, Myeong-Woo,Cho, Won-Seung 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
In this study, machining characteristics of AIN-hBN composites were evaluated in end-milling process. As a first step, AIN-hBN composite specimens with various hBN contents were prepared using hot press method. Material properties of the composites, such as relative density, Young's modulus and fracture toughness, were measured and compared. Then, a series of end-milling experinients were performed under various cutting conditions by changing cutting speed, depth-of-cut and feed rate. Cutting force variations were measured using a tool dynamometer during the cutting experiments. Machined surfaces of the specimens were observed using SEM and a surface pro filer to investigate the surface integrity changes. The cutting force decreased with an increases of hBN content. The cutting process was almost impossible for monolithic AIN, owing to severe chipping. In contrast, at high content of hBN, surface damage and chipping decreased, and better surface roughness can be obtained.
Ultra-Precise Polishing of Mica Glass Ceramics Using MR Fluids and Nano Abrasives
백시영,송기혁,김기범,김병찬,강동성,홍광표,Beak, Si-Young,Song, Ki-Hyeok,Kim, Ki-Beom,Kim, Byung-Chan,Kang, Dong-Sung,Hong, Kwang-Pyo The Korean Society of Manufacturing Process Engine 2017 한국기계가공학회지 Vol.16 No.5
Mica-glass ceramics has features such as micro-sized crystals, high strength, chemical resistance, semitransparent optical properties, etc. Due to its superior material properties, mica glass ceramics have increasing applications in dental and medical components, insulation boards, chemical devices, etc. In many applications, especially for dental and medical components, ultra-precise polishing is required. However, it is known to be a very difficult-to-grind material because of its high hardness and brittle properties. Thus, in this study, a newly developed ultra-precise polishing method is applied to obtain nano-level surface roughness of the mica glass ceramics using magnetorheological (MR) fluids and nano abrasives. Nano-sized ceria particles were used for the polishing of the mica glass ceramics. A series of experiments were performed under various polishing conditions, and the results were analyzed. A very fine surface roughness of Ra=6.127 nm could be obtained.
기압소결에 의해 제조된 AIN-hBN계 머시너블 세라믹스의 가공성에 관한연구
백시영,신봉철,이정원,조명우,이은상,조원승 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
Ceramics are very difficult-to-cut materials because of its high strength and hardness. In this study, to give good machinability to the ceramics, hBN powders are added to AIN by volume of 10, 15 and 20%. The effect of content on mechanical properties, crack propagation and machinability of based machinable ceramics were investigate. Also, As a result of rapping test process, the surface have good rough condition fewer than 0.5㎛(Ra). Get results can be used to develop machinable ceramics of good material properties and machinability.
Mechanical Properties and End-milling Characteristic of AlN-hBN Based Machinable Ceramics
백시영,조명우,조원승 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
In this study, machining characteristics of AlN-hBN composites were evaluated in end-milling process. As a first step, AlN-hBN composite specimens with various hBN contents were prepared using hot press method. Material properties of the composites, such as relative density, Young’s modulus and fracture toughness, were measured and compared. Then, a series of end-milling experiments were performed under various cutting conditions by changing cutting speed, depth-of-cut and feed rate. Cutting force variations were measured using a tool dynamometer during the cutting experiments. Machined surfaces of the specimens were observed using SEM and a surface profiler to investigate the surface integrity changes. The cutting force decreased with an increases of hBN content. The cutting process was almost impossible for monolithic AlN, owing to severe chipping. In contrast, at high content of hBN, surface damage and chipping decreased, and better surface roughness can be obtained. In this study, machining characteristics of AlN-hBN composites were evaluated in end-milling process. As a first step, AlN-hBN composite specimens with various hBN contents were prepared using hot press method. Material properties of the composites, such as relative density, Young’s modulus and fracture toughness, were measured and compared. Then, a series of end-milling experiments were performed under various cutting conditions by changing cutting speed, depth-of-cut and feed rate. Cutting force variations were measured using a tool dynamometer during the cutting experiments. Machined surfaces of the specimens were observed using SEM and a surface profiler to investigate the surface integrity changes. The cutting force decreased with an increases of hBN content. The cutting process was almost impossible for monolithic AlN, owing to severe chipping. In contrast, at high content of hBN, surface damage and chipping decreased, and better surface roughness can be obtained.