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기계구조용 탄소강(SM45C)의 단속절삭 시 절삭력예측을 위한 회귀방정식 도출
배명일(Myung-Il Bae),이이선(Yi-Seon Rhie) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
Interrupted cutting has different cutting characteristics compared with continuous cutting. In interrupted cutting, the workpiece has a groove that regularly impacts the cutting tool and workpiece. Therefore, tool damage occurs rapidly, and this increases the cutting force and surface roughness. In this study, we performed interrupted cutting of carbon steel for machine structure (SM45C) using a coated carbide tool (TT7100). To predict the cutting force, we analyzed the experimental results with a regression analysis. The results were as follows: We confirmed that the factors affecting the principal force and radial force were cutting speed, depth of cut, and feed rate. From the multi-regression analysis, we deduced regression equations, and their coefficients of determination were 89.6, 89.27, and 28.27 for the principal, radial, and feed forces, respectively. This means that the regression equations were significant for the principal and radial forces but not for the feed force.
단침보강 세라믹 공구를 이용한 플라스틱 금형강(STAVAX)의 선삭가공
배명일(Myung-Il Bae),이이선(Yi-Seon Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.6
In this study, we turning plastic mold steel (STAVAX) against cutting speed, depth of cut, feed rate using whisker reinforced ceramic tool (WA1). To predict cutting force, analyze principal, radial, feed force with multi-regression analysis. Results are follows: From the analysis of variance, affected factor to cutting force feed rate, depth of cut, cutting speed in order and cutting speed was very small affect to cutting force. From multi-regression analysis, we extracted regression equation and the coefficient of determination(R2) was 0.9, 0.88, 0.856 at principal, radial and feed force. It means regression equation is significant. From the experimental verification, it was confirmed that principal, radial and feed force was predictable by regression equation.
플라스틱 금형강의 선삭 가공시 중회귀분석을 이용한 표면거칠기 예측
배명일(Myung-Il Bae),이이선(Yi-Seon Rhie) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.4
In this study, we carried out the turning of plastic mold steel(STAVAX) with whisker reinforced ceramic tool(WA1) and analyzed ANOVA(Analysis of Variance) test. Multi-regression analysis was performed to find influential factors to surface roughness and to derive regression equation. Results are follows: From ANOVA test and confidence interval analysis of surface roughness, We found that influential factors to surface roughness was feed rate, cutting speed and depth of cut in order. From multi-regression analysis, we derived regression equation of STAVAX. it"s coefficient of determination(R<SUP>2</SUP>) was 0.945 and It means that regression equation is significant. From experimental verification, we confirmed that surface roughness was predictable by regression equation. Compared with former research, we confirmed that increase of feed rate is the main cause of the growing of surface roughness and cutting force.
단침보강세라믹공구를 이용한 금형강(SKD61)의 선삭가공 시 표면거칠기에 영향을 미치는 인자 및 회귀방정식 도출
배명일(Myung-Il Bae),이이선(Yi-Seon Rhie),김형철(Hyeung-Chul Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.4
In this study, we turning mold steel (SKD61) using whisker reinforced ceramic tool (WA1) to get affected factor to surface roughness and regression equation. For this study, we adapt system of experiments. Results are follows; From the analysis of variance, it was found that affected factor to surface roughness was feed rate, cutting speed, depth of cut in order. From multi-regression analysis, we calculated regression equation and the coefficient of determination(R²). R² was 0.978 and It means regression equation is significant. Regression equation means if feed rate increase 0.039㎜/rev, surface roughness will increase 0.8391㎛, if cutting speed increase 50m/min, surface roughness will decrease 0.034㎛, if depth of cut increase 0.1㎜, surface roughness will increase 0.0203㎛. From the experimental verification, it was confirmed that surface roughness was predictable by system of experiments.
초경피복공구를 이용한 기계구조용 탄소강의 단속절삭시 표면거칠기 예측
배명일(Myung-Il Bae),이이선(Yi-Seon Rhie) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.3
In this study, we carried out the interrupted cutting of carbon steel for a machine structure (SM45C) with a CVD-coated tool and conducted an ANOVA test and a confidence interval analysis to find factors influence the surface roughness and to obtain a regression equation. We found that factor which mostly affects the surface roughness during interrupted cutting was the feed rate. The cutting speed and depth of the cut only had small effect on the surface roughness. From the result of a multi-regression analysis during an interrupted cutting experiment, we obtained regression equation. Its coefficient of determination was 0.918, indicating that the regression equation was predictable. Compared to continuous cutting, if the feed rate increases, the surface roughness will also increase during interrupted cutting.
배명일(Myung Il Bae),김형철(Hyeung Chul Kim),성철현(Chul Hyun Seong),김기수(Ki Soo Kim) 대한공업교육학회 1999 대한공업교육학회지 Vol.24 No.2
In this study, We analyze stiffness of aerostatic bearing using system of experiment for design of magnetic tape manufacture guide roller system and prepare to fundamental design data. Results are following; Affected factors to air bearing stiffness are bearing clearance, bearing length, nozzle diameter, pressure of input air, length of between nozzel distance and optimal conditions of aerostatic bearing are bearing clearance 0.0175㎜, bearing length 45㎜, nozzle diameter 0.2㎜, pressure of input air 7kgf/㎠, length of between nozzle distance 10mm.
PCB 드릴링용 스핀들을 위한 공기 베어링의 최적 설계
배명일(Myung Il Bae),김기수(Ki Soo Kim),이영호(Young Ho Lee) 대한공업교육학회 2001 대한공업교육학회지 Vol.26 No.1
In this study, The stiffness are analyzed aerostatic thrust and radial bearing for PCB drilling using system of experiment. The results are as follows: the stiffness of aerostatic thrust bearing are affected by input air pressure, clearance, number of nozzle. Also, the stiffness of aerostatic radial bearing are affected by input air pressure, diameter of nozzle, length of bearing. A recommended design conditions for aerostatic thrust bearing are as follow: input air pressure 7kg_f/㎠, clearance 0.02㎜, diameter of nozzle 0.2㎜, number of nozzle 7, bearing inner diameter 26㎜ and input air pressure 7kg_f/㎠, clearance 0.015㎜, diameter fo nozzle 0.2㎜, bearing length 45㎜, distance of nozzles 10.5㎜ for aerostatic radial bearing.