초정밀 융합가공을 위한 주축이동식 자동선반의 구조해석에 관한 연구

박명규,이봉구 한국융합학회 2018 한국융합학회논문지 Vol.9 No.5

공작기계의 주축은 황삭 가공에서 부터 정삭가공에 이르는 다양한 작업들이 가능해야 하고, 정속운동 또는 회전 위치결정의 기능을 수행해야 되므로 주축설계에 고려해야 할 변수들이 많다. 주축이동식자동선반은 고정식자동선반에 비해 샤프트가 가늘고 긴 핀 들을 작업할 때 좋은 선반이다. 고정식 자동선반에 비해 외경가공의 정밀도가 매우 높다. 주축 이송 형 선반은 주로 소형 제품을 정밀가공 할 경우에 사용되므로 가공 정밀도가 높아야 한다. 최대 외경 가공 한계 치수는 Ø32, 내경가공 한계 치수는 Ø6까지 가공이 가능하게 제작되어야 한다. 본 연구에서는 주축이동식 자동선반에 사용되는 SCM440 소재의 정·동적특성을 이동식 선반에 적용하여 분석하였다. 주축의 정,동적 특성에 영향을 미치는 인자들을 고려하여 고속 화 및 고정밀도를 갖는 최적설계기술이 확보하기 위하여 수치해석을 이용하여 분석하였다. In the machine tool spindle, various tasks ranging from roughing to finishing must be possible, and the functions of constant speed movement or rotation positioning must be performed. Therefore, there are many variables to be considered in the spindle design. The Swiss Turn Type spindle automatic lathe is a good machine tool for working pins with thinner shafts than a fixed automatic lathe. The Swiss Turn Type spindle is mainly used for precision machining of small products, so the machining precision should be high. The maximum outer diameter limit shall be Ø32 and the inner diameter limit shall be Ø6. In this study, the static and dynamic characteristics of the SCM440 material used in the spindle type automatic lathe were analyzed by applying it to the Swiss turn type spindle automatic lathe. Numerical analysis was used to obtain optimal design technique with high speed and high accuracy considering the factors affecting the static and dynamic characteristics of the spindle.

공기 베어링 스핀들을 이용한 PCB 드릴링에 관한 연구

배명일(Myung Il Bae),김상진(Sang Jin Kim),김기수(Ki Soo Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.3

This paper describes the PCB drilling using an ultra high-speed air bearing spindle system and micro drill. For this research, we have developed the ultra high-speed air bearing spindle of 125,000 rpm and made an experiment for the application possibility in the PCB drilling. In order to estimate the drilling performance, we have investigated the size and damage of drilled hole, and the wear of drill at 90,000rpm. Results are as follows; we have confirmed the possibility in the PCB drilling of air bearing spindle. In case of micro-drilling PCB at 0.1㎜ ∼ 0.3㎜, the increase in the number of drilling has resulted in a bigger size of holes and also a bigger size of damage. It has been found that the wear of micro drill tends to concentrate in the main cutting edge.

머시닝센터 주축 고장예측에 관한 연구

이태홍(Tae-Hong Lee) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4

Main Spindle System has effect on performance of machine tools and working quality as well as is required of high reliability. Especially, it takes great importance in producing automobiles which includes a large number of working processes. However, main spindle unit in Machine tools are often cases where damage occurs do not meet the design life due to driving in harsh environments. This is when excessive maintenance and repair of machine tools or for damage stability has resulted in huge economic losses. Therefore, this studying propose a method of accelerated life test for diagnosing and prognosis the state of life assessment main spindle system. Time status monitoring of diagnostic data - through the analysis of the frequency band signals were carried out inside the main spindle bearing condition monitoring and fault diagnosis.

가정용 정미기의 벼 도정 특성에 관한 연구 : 주축회전수, 롤러의 세라믹코팅길이, 이송스크루 피치의 최적 조건에대하여

연광석,조성찬,한충수 충북대학교 농업과학기술연구소 2000 農業科學硏究 Vol.17 No.-

This research was carried out to examine the optimum design conditions of the milling machine by analyzing the milling characteristics of a selected vertical type small-scale milling machine - an experimental milling machine process the rough rice directly to white rice without husking process - by varying structures of the milling machine such as the main spindle speed, ceramic coating length of the roller, and feed screw pitch, which are the major affecting factors of the milling process. The following are the results of this research; 1.The design condition of the highest white rice processing capacity was 970rpm of the main spindle revolution and 19㎜ of the feed screw pitch. 2.The lowest electric energy consumption condition was 900 and 970rpm of the main spindle revolution and 19mm of the feed screw pitch. Range of the rice temperature was increased as the feed screw pitch decreased and the main spindle revolution increased. 4.Broken rice ratio was relatively low with the range of 0.8∼1.3%. 5.Range of the moisture content loss was very low with the range of 0.05∼0.4%. 주요 용어(Key words): 정미기(Milling machine), 주축(Main spindle), 세라믹코팅(Ceramic coating), 이송스크루(Feed screw)

소형 정밀 선반용 주축의 열 변형 해석

김건(Jin Jian),고태조(Tae-Jo Ko),김희술(Hee-Sool Kim) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.1

Multi-function and miniaturization of the medical equipment and tele-communication systems need small and high precision machined parts. For the economic machining of the small size workpiece it should be machined by small and high precision machine tools with high speed machining. The belt type driving system in turning lathe has a limitation of spindle speeds because of the vibrations from driving mechanism, built-in type of driving mechanism is used to reduce the vibration. However, the main spindle of the built-in motor is connected directly to the motor, so the heat generation of the motor and bearing makes bad influence of the accuracy of machine tools. In this study, the analysis of heat generation from motor and bearings supporting main spindle and experiment were carried out. The results of theoretical simulation of temperature and deformation of the main spindle are good agreement with those of measured.

롤러베어링 구조형 주축 회전체의 언밸런스 변동과 절삭표면상태 연관성에 관한 연구

하정웅(Jeong-ung Ha),박동희(Dong-hui Park),박황기(Hwang-gi Park),전승민(Seung-min Jeon),홍진표(Jin-pyo Hong),윤상환(Sang-hwan Yoon),박종규(Jong-kyu Park) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.9

The rotation accuracy of the main spindle that determines the accuracy of CNC machine tools is closely related to the quality of production because it directly affects the shape error and surface roughness of the workpiece. Therefore, the main spindle requires high rotation accuracy, rigidity, and rotation technology. This rotation accuracy is greatly affected by the bearing, center alignment between rotating parts, assembly tolerance, and unbalance of the rotation mass. In this study, the effects of the unbalance of the rotation mass of the main spindle on the rotation accuracy were investigated experimentally. In particular, we tried to study the technical reasons for improving the unbalance of the main spindle and maintaining the rotation accuracy as we verified the correlation between the vibration characteristics of CNC machine tools due to the specifically set unbalance amount and the surface roughness of the workpiece.

내장형 모터 주축의 열 특성 해석과 실험적 고찰

김건(Jin Jian),김희술(Hee-Sool Kin),고태조(Tae-Jo Ko) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-

Multi-function and miniaturization of the medical equipment and tele-communication systems need small and high precision machined parts. For the economic machining of the small size workpiece it should be machined by small and high precision machine tools with high speed machining. The belt type driving system in turning lathe has a limitation of spindle speeds because of the vibrations from driving mechanism, Built-in type of driving mechanism is used to reduce the vibration. However, the main spindle of the built-in motor is connected directly to the motor, So the heat generation of the motor and bearing makes bad influence of the accuracy of machine tools. In this study, the analysis of heat generation from motor and bearings supporting main spindle and experiment were carried out. The results of theoretical simulation of temperature and deformation of the main spindle are good agreement with those of measured.

공작기계 주축설계에 영향을 미치는 베어링 파라미터에 관한 연구

여은구,김엽래,한강근,박면웅,이용신,유헌일 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1

The purpose of this study is to investigate the effects of operation factors of a typical main spindle system of the efficiency of machine tool. In this study, both static and dynamic analyses of typical main spindle system of the machine tool are performed using a finite element method. These finite element results are then used to predict the bearing stiffness, the amount of heat generation as well as the bearing life in the spindle system. Effects of material type of ball-bearing, bearing-lubricant type and main spindle bearing preload are examined.

재제조를 위한 노후 플래너 밀러 주축계의 구조해석을 통한 정적 안정화 설계

이현준(H. J. Lee),이은웅(E. W. Lee),김홍록(H. R. Kim),김진우(J. W. Kim),정원지(W. J. Chung) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월

공작기계는 대형구조물이 사용되므로 재제조(Remanufacturing) 효과를 크게 얻을 수 있는 장비이며 중, 대형 공작기계의 대부분을 차지한다. 그 중 플래너 밀러(Planner Miller)는 크기가 매우 커 수십 톤에 이르기까지 재제조를 통한 자원 및 에너지 저감 효과가 매우 높다. 플래너 밀러는 스핀들(Spindle)을 사용하여 공구를 회전시켜 가공물을 절삭 가공하지만 지속적인 가공에 따른 베어링과 공구 안내 면의 불균일한 마모가 발생하고 그로 인해 가공정밀도가 떨어진다. 그리고 스핀들과 같이 일부 기능이 저하되거나 노후화된 부품들은 교환 및 폐기 처리가 된다. 최근에는 부품들의 재활용 및 재사용 등의 필요성이 강조되고 있다. 본 논문에서는 재제조를 위한 노후 플래너 밀러 주축계(Spindle 및 Ram)의 구조해석(Structural Analysis)을 통한 정적 안정화 설계를 진행하고 있다. 재제조 전 스핀들의 상태 분석을 위해 역설계를 통해 비접촉식 3D 스캐너를 이용해서 얻은 스캔 데이터를 활용하여 해석 전용 프로그램인 ANSYS Workbench 를 이용하여 플래너 밀러(Planner Miller)의 주축계의 회전력 및 베어링 고정 조건을 고려한 구속 조건을 설정한 다음에 구조해석을 진행하였다. 따라서 노후화된 플래너 밀러의 주축계 구조해석을 통해 결과를 확인하고 구조적 안전성을 검토하였다.

중심합성계획법을 이용한 노후 플래너 밀러 주축 스핀들의 역설계에 관한 연구

김홍록(Hong-Rok Kim),정원지(Won-Jee Chung),설상석(Sang-Seok Seol),홍대선(Dae-Sun Hong),공석환(Seok-Whan Gong),이현준(Hyun-Jun Lee),이성원(Seong-Won Lee) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.3

Whereas the necessity for recycling and reuse is being emphasized owing to the depletion of resources and waste disposal problems caused by the continuous development of the industry, the importance of remanufacturing has been highlighted recently. Re-manufacturing involves a series of processes in which failed disposal or aging goods are recovered to a state similar to that of a new product. In this regard, machine tools, which are large structures, can achieve the effect of remanufacturing. Among the various elements constituting the machine tool, the main spindle portion that affects the processing precision is critical. Therefore, this study is conducted to derive improvement measures for the main axis of an old Miller planner via reverse engineering and central composite design, which is one of the core processes of remanufacturing.