http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
초고속 스핀들에 의한 마이크로 엔드밀링의 가공특성에 관한 연구
권동희(D. H. Kwon),강익수(I. S. Kang),김전하(J. H. Kim),강명창(M. C. Kang),김정석(J. S. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Recently, the advanced industries using micro parts are rapidly growing. The appearance of ultra-precision feed mechanism and the development of control system make it possible to process parts in sub millimeter scale by mechanical methods. Micro endmilling is one of the prominent technology that has wide sp ectrum of application field ranging from macro parts to micro products. So, micro stairs have been trying to cut by using high revolution air turbine spindle and microendmill, and studying for magnitude of cutting force. This investigation deals removal characteristics of burr generated by micro endmilling process. Also, decreasing of burr is significant problem in making smooth and precise parts in micro endmilling. In micro endmilling, the material removal rate(MRR) and cutting forces are very small. This paper presents an investigation on the machining characteristics for micro stairs by using ultrahigh-speed air turbine spindle in machining.
A Study on the Micro-endmilling Surface Prediction Model with Non-dynamic Errors
김건희,윤길상,이정원,김흥규,조명우 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
In this study, the surface prediction numerical model for micro-endmilling, including the non-dynamic errors of micro-endmilling such as tool geometric and set-up errors, was proposed. For verifying the proposed prediction numerical model, the inspection method of tool non-dynamic errors was proposed and applied to the verification experiments. In micro-endmilling, the geometry and manufacture error of micro tool and tool set-up error affect the quality of micro cutting process seriously compared to macro endmilling because the specific cutting energy and feed per tooth to tool radius are very large and commented errors works in combination. Therefore, for the numerical model for predicting the micro-endmilling surface, error variables such as tool dish, tool eccentricity, tilted edge part, and tool runout were applied to the proposed numerical model. Besides, it is very important that those errors are measured accurately. Finally, the numerical prediction model was verified by the micro cutting experiments applied the inspection method of tool non-dynamic errors.
제태진(Tae-Jin Je),최두선(Doo-Sun Choi),이응숙(Eung-Sug Lee),노진석(Jin-Seok Noh),강근진(Keun-Jin Kang),공병완(Byung-Wan Kong) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Micro drilling technology is widely requested at various filed such as nozzles, electronic products, medical components, precision tools and gages et al. Especially, dental scaler tip is recently highlighted in domestic industry. However, all dental scaler tips are imported from foreign companies. In this paper, We have studied the micro-hole process of scaler tip in order to develop dental Ultra-sonic scaler system with high performance. Micro hole process on SUS 304 for a scaler tip were performed with 0.1mm diameter flat endmill and same diameter ball endmill, and machining characteristics of each endmill were compared. In the future, the optimum conditions of micro hole process will be established based om this research.
초소형 방열판 제작을 위한 구리 미세절삭 가공 특성 연구
김건희,윤길상,허영무,정동수,조명우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Copper is widely used in electrode and radiation plate because it has high heat and electric conductivities, Specially, the subminiature radiation plate with copper is very useful for MEMS field, In this paper, micro cutting characteristics of copper were analyzed. For analyzing the cutting characteristics, micro endmilling were executed for fabricating the micro ribs and micro-grid pattern, finally, the features of micro ribs according to the aspect ratio and the quality of micro-grid pattern according to the cutting direction were observed and analyzed using micro scope and vision sensor.
권동희(Dong-Hee Kwon),김정석(Jeong-Suk Kim) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Recently, the trend of manufacturing industry is the adoption of high-speed micro machining technology to increase productivity, and it is very important to various electrical/electronic, semi-conductor, automotive, micro machining device manufacturers. A micro endmill needs a device with highly sensitive cutting force and tool wear measuring system for a response to a high speed principal axis and delivery, since interrupted cutting is done with the rotation of a endmill. In addition, a precise measurement standard, instrument, and analysis technique are needed for exact flank wear evaluation, because an endmill rotates with a peculiar geometry like a relief, rake, and helix angle. Therefore, new micro tool dynamometer are developed. The cutting forces of micro endmilling can be measured by new micro tool dynamometer. But general dynamometer has low natural frequency and so is improper for measuring very high frequency cutting forces in micro endmilling. In this study, the new micro tool dynamometer and tool wear measuring system which has very high natural frequency is newly designed.
C-means 알고리즘을 이용한 마이크로 엔드밀의 상태 감시
권동희,정연식,강익수,김전하,김정석 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
Recently, the advanced industries using micro parts are rapidly growing. Micro end milling is one of the prominent technology that has wide spectrum of application field ranging from macro to micro parts. Also, the method of micro-grooving using micro end milling is used widely owing to many merit, but has problems of precision and quality of products due to tool wear and tool fracture. This study deals with condition monitoring using acoustic emission(AE) signal in the micro-grooving. First, the feature extraction of AE signal directly related to machining process is executed. Then, the distinctive micro end mill state according to the each tool condition is classified by using the fuzzy C-means algorithm, which is one of the methods to recognize data patterns. These result is effective monitoring method of micro end mill state by the AE sensing techniques which can be expected to be applicable to micro machining processes in the future.
마이크로 엔드밀에 의한 미세격벽가공의 가공특성에 관한 연구
민승기,이선우,이동주,이응숙,제태진 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
Recently, miniaturization and mass production are the main trends in manufacturing fields. Therefore, ultraprecision machining and MEMS technology have been taken more and more important position in machining of microparts. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro parts to micro products, such as PDP ad IT components, in precision products manufacturing. However, decreasing of burr is significant problem in making smooth and precise parts in micro endmilling. This paper shows removal characteristics of burr generated by micro emdmilling process. This results satisfies micro for micro barrier ribs of heights is 50㎛, 100㎛, 200㎛, 300㎛, and observation from of burr. Additionally, it is necessary to understand the formation mechanism of burr of micro barrier ribs to find proper decreasing method.
마이크로 엔드밀링에서 AE 신호를 이용한 공구상태 감시
강익수(Ik Soo Kang),정연식(Yun Sik Jeong),권동희(Dong Hee Kwon),김전하(Jeon Ha Kim),김정석(Jeong Suk Kim),안중환(Jung Hwan Ahn) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.1
Ultraprecision machining and MEMS technology have been taken more and more important position in machining of microparts. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro parts to micro products. Also, the method of micro-grooving using micro endmill is used widely owing to many merit, but has problems of precision and quality of products due to tool wear and tool fracture. This investigation deals with state monitoring using acoustic emission(AE) signal in the micro-grooving. Characteristic evaluation of AE raw signal, AE hit and frequency analysis for condition monitoring is presented. Also, the feature extraction of AE signal directly related to machining process is executed. Then, the distinctive micro endmill state according to the each tool condition is classified by the fuzzy C-means algorithm.
Damaged Layer Characteristics in Micro-Endmilling of Copper Using an Ultrahigh-Speed Air Spindle
Jong Whan Lee,Dong Hee Kwon,Jeong Suk Kim,Duck Whan Kim,Myung Chang Kang,Bok Kyu Lim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.2
This paper presents an investigation on the characteristics of damaged layer in micro-machining by using the ultrahigh-speed air spindle. The damaged layer in metal cutting is derived from plastic deformation and transformation of metal structure. In this study, micro-cutting force, surface roughness, and plastic deformation layer according to the variation of machining conditions were investigated by experiments. The damaged layer was measured using optical microscope for the samples prepared by metallographic techniques. Its scale was dependent on cutting process parameters, especially feed per tooth. According to experimental results, it was verified that the thickness of damaged layer was increased with increasing of feed per tooth and cutting depth, also thickness of damaged layer was reduced in down-milling compared to upmilling during micro-endmilling operation.
권동희,박진효,김정석,김병민,정융호,강명창 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
As demands for micro parts are on the increase in recent industries such as aerospace, biomedical, electronics, environment, information technology and display, the need for manufacturing such parts is also increasing. Major methods of manufacturing micro parts are based on semiconductor process technology such as lithography and etching and non-traditional machining using lasers, ultrasonic, ion-beams or electrical discharge. However, these methods require lots of time, workpiece materials are limited, and such methods are only applicable to the machining of two-dimensional shapes. Therefore, mechanical machining methods are required for the manufacturing of micro parts with complex shapes. This paper presents an investigation on the characteristics for micro groove machining by using the ultrahigh-speed air turbine spindle, and verifies the properties of mechanical method in fabricating molds for micro barrier ribs. As a result, the optimal machining condition could be found from the investigation of surface roughness according to the kinds of burr shapes in the fabricating of iron mold by using micro endmill.