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A. Davoudinejad,M. Y. Noordin 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
This study presents an experimental investigation on turning hardened DF-3 tool steel (~58HRC) with PVD-TiN coated mixed ceramic. We focused on the effect of chamfer and honed edge geometry on tool wear, tool life, cutting forces and surface finish of the machinedworkpiece. The effects of the process parameters on performance characteristics were investigated using ANOVA. It was foundthat longer tool life was recorded with chamfered edge geometry at various cutting conditions. The typical damage observed as flank andcrater wear for ceramic tools and abrasive wear was found as the main mechanism.The optimal cutting speed was 155 m/min, with whicha tolerable tool life and volume of material removal was obtained for both edges geometry. Finer machined surface was left by chamferedtool with feeds and speeds in the range of 0.125-0.05 mm/rev and 155-210 m/min, respectively; also, cutting forces decrease with increasedcutting speed. The obtained consequence of cutting forces shows that tool wear has a considerable effect on cutting forces andgreater forces values recorded with honed tools.
이명재,김광래,유봉환 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.2
By using AIP(Arc Ion Plating) of a physical vapor deposition for the first time in Korea a ceramic tool whose surface is coated single layeredly with TiN is developed. In addition, cutting resistance appearing in the process of finishing cut of hardened carbon tool steel, STC3 is studied. The principal and radial components of cutting resistance in those cutting conditions appear to be the same or similar, and the feed component is relatively small. The feed component is found to be in proportion to cutting width, and the radial component in proportion to cutting thickness. Owing to coating the cutting resistance of a TiN coated ceramic tool increases compared with that of a general ceramic tool.
Mill-Grinding with Electroplated Diamond Abrasives for Ceramic Cutting
고태조,윤인준 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Ceramic materials are very hard and brittle and are not easily cut with typical methods, such as grinding or cutting. These materials are cut mostly using the grinding process, but the material removal rate or process efficiency is not satisfactory. For this reason, a hybrid electroplated diamond abrasive tool was proposed for cutting and grinding. The tool looks like a typical endmill or electroplated grinding wheel, but it has a cutting edge and flutes without a radial land and clearance. After electroplating the cutting tools with diamond abrasives, cutting experiments were carried out. The results showed that a ductile cutting regime was possible with the diamond abrasives. In addition, the cutting speed could be increased as in typical cutting. The tool life, defined as the rate of detachment of the abrasive, was also satisfactory. Consequently, this type of cutting tool is useful for cutting hard materials such as ceramics or glass that are used in advanced industrial products.
김광래 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.3
This thesis is concerned with the study on the characteristics of the cutting resistance occurring in finish machining of hardened steels such as carbon tool steel and alloy tool steel by a ceramic tool with nose radius. For the purpose, the shape of cutting cross-section made at nose part of the tool was analyzed geometrically and wear mechanism on the flank face of the ceramic tool is investigated. In order to investigate the characteristics of cutting resistance, two categories of cutting conditions are suggested, along with geometrical analysis. One category includes the conventional cutting parameters such as feed and depth of cut, another containing new cutting parameters of thickness of cut and width of cut etc. Thickness of cut, width of cut and area of undeformed chip section formed by the condition of engagement between workpiece and cutting tool are determined as the function of feed, depth of cut and nose radius of cutting tool. And an effective approach angle is determined by depth of cut and nose radius.
세라믹 마이크로 공구의 금속재 미세절삭 가공 특성에 관한 연구
김건희(G. H. Kim),정우철(W. C. Jung),허영무(Y. M. Heo),신광호(K. H. Shin),장성호(S. H. Chang),윤길상(G. S. Yoon),이근안(G. A. Lee),권영삼(Y. S. Kwon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In this study, the efficiency of ceramic micro cutting tool with abrasive-type was evaluated by basic micro cutting experiments. Generally, micro drill and endmill made of tungsten-carbide which have sharply cutting edge are worn out rapidly. Therefore, ceramic micro tool which has minute bump feature was proposed in this study. In experiments, micro hole and slot shape were fabricated by ceramic micro tool. Finally the quality of fabricated hole and slot were evaluated and tool wear trend was observed by microscope.
절삭 공구용 세라믹의 소결조직에 따른 파괴인성과 경도의 평가
안동길,윤명진 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
Dense Al_2O_3-30%TiC and Si_3N_4 ceramic tool materials with various grain size were produced by sintering-HIP treat-ment and by gas-pressure sintering. The fracture toughness was measured by indentation fracture and indentation strength method for both ceramics with various grain sire. The effect of the grain size on the fracture toughness was evaluated, and the correlation between fracture toughness and mechanical properties such as hardness, Young's modulus and flexural strength of these ceramic were also investigated. The highest fracture toughness of around 6.7MPa·m^1/2 was obtained in Si_3N_4 ceramics with grain size of 1.58㎛. With a larger grain size of Al_2O_3-30% TiC and Si_3N_4 ceramics. the fracture tough-ness was generally increased. The increased fracture toughness of these caramic also improved the flexural strength although the hardness decreased considerably. Similar results were obtained in grain size and mechanical properties on both Al_2O_3-30% TiC and Si_3N_4 ceramic tool materials.
Ti(CN)기 탄화물질 세라믹스의 기계적 특성과 절삭성능
박동수,이양두,정태주,강신후,Park, Dong-Su,Lee, Yang-Du,Jeong, Tae-Ju,Gang, Sin-Hu 한국기계연구원 1998 硏究論文集 Vol.28 No.-
Fully dense THCN) based carbonitride ceramics were fabricated by pressureless sintering. During sintering, solid solutions were formed from the ceramic ingredients. The ceramics exhibited microvickers hardness of 1560-2050kgf/mm2, fracture toughness of 3.0-5.4 MPa $m^(1/2)$, and three point flexural strength of 645-1072 MPa. Some of the ceramics were shaped in a cutting tool, and the cutting performance was evaluated. In case of cutting SCM440 alloy steel, the ceramics showed better performance than the commercially available alumina-titanium carbide ceramic cutting tool. Considering the excellent productivity of pressureless sintering compared with other densification methods and their cutting performance, this new class of ceramics are very promising for wear resistant applications.
난삭재인 STD11 강의 정면밀링가공시 절삭특성에 관한 연구
김형석,문상돈,오성훈 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2003 工學硏究 Vol.34 No.-
Wear and fracture mode of ceramic tool for hardened Std11 steel was investigated by face milling in this study. The cutting force and acoustic emission(AE) signal were utilized to detect the wear and fracture of ceramic tool. The following conclusions were obtained : (1) The wear and fracture modes of ceramic tool are characterized by the three types : ① wear which has normal wear and notch wear, ② wear caused by scooping on the rake face, ③ large fracture caused by thermal crack in the rake face. (2) The wear behaviour of ceramic tool can be detected by the increase of mean cutting force and the variation of the AE RMS voltage. (3) The catastrophic fracture of ceramic tool can be detected by the cutting force(Fz-component). (4) As the hardness of work material increased, acoustic emission RMS valve and mean cutting force(Fz) increased linearly, but the tool life decrease.
Nagano Mituyoshi,Sano Hideaki,Sakaguchi Shigeya,Zheng Guo Bin,Uchiyama Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In order to clarify the wear resistance as cutting tools, the effect of oxygen addition on oxidation behavior of the β-Si3N4 ceramics with 5 mass% Y2O3 and 2 or 4 mass% Al2O3 was investigated by performing oxidation tests in air at 1300° to 1400°C and cutting performance tests. From test results, we could conclude that the mechanical properties of β-Si3N4 ceramics depending on oxygen introduction are much effective on cutting performance improvements of β-Si3N4 ceramics.
The Study of Tool Wear About Ceramic Cutting Tool Processing Mechanism of Super-alloy
Zhao Can,Tao GuangFu,Liu Yubo,Guo Yanyan,Zhang Yanhui 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.5
Separately using two different types of ceramic cutting tool, through the experiments of ceramic cutting tool to study the processing of super-alloy of tool wear, compare the two processing the cutting tool wear condition, and further analysis of the wear mechanism of ceramic cutting tool process, and get the related conclusion.