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강익수,최현진,이승용,이태호,고영준,김기홍 대한시과학회 2011 대한시과학회지 Vol.13 No.4
Purpose: The objective of this study is to investigate proper machining conditions of cellulose acetate(CA) for eyewear frames. The results are able to be applied to design the high-speed machine tool of CA frame. Methods: Cutting forces, surface roughnesses, machined surface shapes and chip formations are investigated to evaluate the machinability of CA. The proper machining conditions are selected through various machining tests with cutting speeds and feed rates. Results: Feed-direction cutting forces are increased at high-speeds of 20,000 and 30,000 rpm. On the other hand, radial-direction cutting forces are independent upon the cutting speeds. The surface roughnesses of higher cutting speed conditions are better than that of lower speed conditions when the feed per tooth is 0.05 mm. Conclusions: The machinability of CA materials were discussed in terms of the cutting forces and surface roughnesses. The cutting speed of 25,000 rpm is the proper machining condition considering the cutting forces. At the small feed per tooth of 0.05 mm the conditions between 20,000 and 30,000rpm are recommended considering the surface roughnesses and chip formations. 목 적: 본 연구는 안경테 소재용 셀룰로오스 아세테이트(Cellulose Acetate; CA)의 최적 가공조건을 규명하여 안경테 전용 가공기의 설계조건 선정에 활용하고자 한다. 방 법: CA안경테 소재의 가공성 평가를 위해 절삭력, 표면조도 및 형상, 칩 형상 등을 분석하였다. 절삭속도와 이송속도를 가공변수로 다양한 실험을 수행하여 적정 가공조건을 선정하였다. 결 과: CA안경테의 반경방향 절삭력은 절삭속도에 변화에 따른 영향이 미미한 반면, 이송방향 절삭력은20,000과 30,000 rpm에서 증가하는 경향을 보였다. 표면조도는 날당 이송이 작은 0.05 mm 경우 절삭속도가 증가하면서 양호해지는 결과를 얻었다. 결 론: 안경테 소재용 CA의 가공성을 절삭력과 가공면의 상태를 고려하여 평가하였다. 절삭력을 고려했을 때 절삭속도가 25,000 rpm이 가장 적정한 조건으로 나타났다. 표면조도를 고려했을 경우에는 저 날당 이송, 고 절삭속도가 최적 가공조건이었다. 따라서 이를 종합했을 때 절삭력은 전체적으로 낮은 값을 가지므로표면조도를 주요 인자로 고려하여 날당 이송 0.05 mm, 절삭속도 20,000~ 30,000 rpm이 적정 가공조건으로 나타났다.
강익수,강명창,김정석,김기태 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
The high speed machining center(HMC) has been widely applied to manufacture a die and trial product in many machine industry. Because the evaluation for HMC is not sufficiently performed and the efficient cutting conditions can't be selected, a great loss has been caused in the cost aspect. In this study, the need of preliminary running time and unstable spindle speed is presented by the analysis of acceleration in idling. The Machinability for the TiAIN coated flat end mill and STD11(H_(R)C60) is evaluated from the trends of tool wear and cutting force according to cutting conditions. The resonance spindle speed is identified through the tool wear and natural frequency test.
사출금형의 5축 고속가공에서 공구자세에 따른 가공 특성에 관한 연구
강익수,김석원,김정석,이기용 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
The high speed machining has been widely applied to manufacture a die and machine elements product in industrial field. Especially, 5-axis milling has been employed to produce a wide range of turbine blades, impellers and complex molds. In this study, machining characteristics of injection mold was investigated according to tool position control. The cutting force and surface roughness were measured with various tool position angles. When the tool position angle was over 25 degree, the cutting force was decreased and surface roughness was good compared with low tool position angles.
강익수,강명창,김정석,김기태 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
The high speed machining center(HMC) has been widely applied to manufacture a die and machine elements product in industrial field. Because the evaluation for HMC is not sufficiently performed, ineffective machining is occasionally conducted in machining industry. In this study, the dynamic characteristics of newly developed machining center is evaluated under running condition and the machinability is investigated experimentally. Also, the in-process measuring instrument which can measure the tool wear on the machine were developed by using the CCD and exclusive jig and calibration instrument for tool wear measurement.
Cutting force model considering tool edge geometryfor micro end milling process
강익수,Jeong Suk Kim,Yong Wie Seo 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.2
The analysis of the cutting force in micro end milling plays an important role in characterizing the cutting process, as the tool wear and surface texture depend on the cutting forces. Because the depth of cut is larger than the tool edge radius in conventional cutting, the effect of the tool edge radius can be ignored. However, in micro cutting, this radius has an influence on the cutting mechanism. In this study, an analytical cutting force model for micro end milling is proposed for predicting the cutting forces. The cutting force model, which considers the edge radius of the micro end mill, is simulated. The validity is investigated through the newly developed tool dynamometer for the micro end milling process. The predicted cutting forces were consistent with the experimental results.