FEM을 이용한 Micromachining용 Tool 및 Tool holder의 변형해석

민경탁(Kyung-Tak Min),장호수(Ho-Su Jang) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.1

Micromachining technology using a ultra-precision micro machining system is widely applied in the fields of optics, biotechnology and analytical chemistry, etc. specially in micro fabrication of fresnel lens, light guide panels of TFT-LED and PDP ribs with micro-patterns. machining errors have an effect on the performance of those products. The deflection of tool and tool holder is known to be one of the very important factors that is due to machining errors in micro machining. The deflections of diamond tool and tool holder used in micro-grooving are analysed by FEM. We analysed by FEM. With an linearity valuation of FEM, deflection of tool and tool holder is calculated by using the data of cutting force which is acquired from micro-V groove machining experiments in micro machining system.

Design and simulation of thermal residual stresses of coatings on WC-Co cemented carbide cutting tool substrate

Anhai Li,Jun Zhao,Jian Zang,Wei Zheng 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.8

Large thermal residual stresses in coatings during the coating deposition process may easily lead to coating delamination of coated carbide tools in machining. In order to reduce the possibility of coating delamination during the tool failure process, a theoretical method was proposed and a numerical method was constructed for the coating design of WC-Co cemented carbide cutting tools. The thermal residual stresses of multi-layered coatings were analytically modeled based on equivalent parameters of coating properties, and the stress distribution of coatings are simulated by Finite element method (FEM). The theoretically calculated results and the FEM simulated results were verified and in good agreement with the experimental test results. The effects of coating thickness, tool substrate, coating type and interlayer were investigated by the proposed geometric and FEM model. Based on the evaluations of matchability of tool substrate and tool coatings, the basic principles of tool coating design were proposed. This provides theoretical basis for the selection and design of coatings of cutting tools in high-speed machining.

주축의 동적거동시 FEM을 이용한 열적 특성에 관한연구

임영철,김종관 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

This paper has studied thermal characteristics of machine tool to develope high speed spindle and optimum design condidering the thermal deformation. Comparing the test data of temperature measurement and structural analysis data using FEM, we verifiedthe test validity and predicted thermal deformation, influence of spindle generation of heat, and established cooling system to prevent the thermal deformation. 1) The temperature rise of spindle system depends on increasing number of rotation and shows sudden doubling increment of number of rotation over 7,000rpm. 2) Oil jacket cooling can be effective cooling method below 8,000rpm but, over 8,000rpm, it shows the decrement of cooling effect. 3) Comparing FEM analysis results and revolution test results, we can confirmn approximate temperature change consequently, it is possible to simulate temperature rise and thermal distribution on the inside of spindle system. 4) We can confirm that simulated approach by FEM analysis can be effective method in thermal-appropriate design..

A Study on Major Factors Influencing Dry Cutting Temperature of AISI 304 Stainless Steel

Hui-Bo He,Hua-Ying Li,Jun Yang,Xian-Yin Zhang,Qi-Bin Yue,Xue Jiang,류성기 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.10

TiN coated and uncoated tools were used to conduct the dry cutting temperatures for AISI 304 stainless steel. Effects of cutting variables on cutting temperatures were investigated using single factor experiment method. The optimal cutting parameters of cutting temperatures were obtained through orthogonal experiment method. The forming process and temperature distribution of chips were analyzed using finite element method (FEM). The results show that cutting temperature generally increases with the increase of cutting speed and feed rate. When depth of cut increases at the range of 0.8-1.5 mm, the cutting temperature increases firstly and decreases subsequently. And the cutting temperature of TiN coated tool is lower than that of uncoated tool. The optimal parameters of cutting temperature are obtained by orthogonal experiment, which is A1B1C3. The highest temperature appears on the second deformation zone by the simulation.

공작기계 적용을 위한 MR 클러치 설계

김옥현(Ock Hyun Kim) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.1

Magneto-Rheological(MR) fluid composes of a base fluid and ferromagnetic particles less than tens of micrometer size dispersed in the fluid. It is called as a smart material because its rheological properties are changable by a magnetic field. Its important applications are active devices such as controllable dampers and controllable clutches. The merit of those products is that their functional characteristics are controllable such that they enable active control strategies. This paper proposes an idea for machine tool applications of the MR fluid clutch as a safety device for power transmission. FEM has been used for magnetic field analyses and the results are compared with some former experiments. Some design syntheses of the MR clutches are suggested and hopefully considered that it may be an effective safety device for power transmission of machine tools.

Structural analysis for final design of ITER sector In-pit Assembly Tool

Ha, Min-Su,Bae, Jinho,Nam, Kyoungo,Chung, Sikun,Park, Soo-Hyeon,Chung, Wooho,Hwang, Hyun-Sung,Ha, Jeong-Min,Moon, Jaehwan Elsevier 2018 Fusion engineering and design Vol.136 No.2

<P><B>Abstract</B></P> <P>The Sector In-pit Assembly Tool is special assembly tools to complete nine of the 40° sector which is sub-assembled in the assembly hall into tokamak machine at in-pit. The function of the Sector In-pit Assembly Tool is to support, and stabilize the sub-assembled 40° sectors during tokamak pit assembly. In order to assess the design and the structural integrity of the Sector In-pit Assembly Tool, the structural analyses have been performed under the load combinations according to load specifications including the SL-1 seismic load. There are thirty assembly configurations for Sector In-pit Assembly Tool. Three representative configurations of the assembly configurations are selected to assess the structural integrity. These configurations would be the worst configuration for the central column which is the main part of the tool. The results of the analyses show that the structural integrity meet the design requirements. This paper provides the result of the design for the Sector In-pit Assembly Tool.</P>

고정번지식 자동 공구교환 시스템의 구조해석 및 모드해석

이춘만,허영진 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

Recently, many studies have been undergoing to reduce a working time in a field of machine tool. There are two ways of reducing working time; to reduce actual working time by heighten spindle speed and to reduce stand-by time by shortening tool exchange time. Automatic tool change system belongs to the latter case. Fixed address type automatic tool change system can store more number of tools in small space than magazine transfer type automatic tool changer as well as shorten tool exchange time. In this paper, a study on the structural analysis and modal analysis of fixed address type automatic tool change system is successfully carried out by simplified equivalent model of finite element method.

헬리컬 단조 공정 해석을 위한 유한요소해석 기술 연구

정현철(H. C. Jung),이영선(Y. S. Lee),강범수(B. S. Kang) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5

The high production rate and low material consumption are the best advantage of die forging process. Especially, many kinds of gears such as spline, bevel and spur gear which comprised automotive transmissions and differential gear component have been researched to manufacture with high mechanical properties. Despite many researches, helical gear is difficult to control the shape and to improve the accuracy of dimensions due to the helix angle. Also it couldn’t apply in real industrial field due to die failure by the high forming load and reduced tool life. In this paper, some die shapes for helical gear by cold extrusion process were proposed to improve the accuracy of dimensions and to increase tool life using FEM. The results of each condition such as the forming load and burr were compared to find the optimal condition and the effect on the different inlet angles of tooth shape. After then the die stress on changes in the shape of tooth from optimal inlet angle and mesh density was analyzed and compared by 1 st principle stress.

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.

RFID TAG 미세패턴 성형을 위한 공구혼 진동해석

김강은(Kang-Eun Kim),이봉구(Bong-Gu Lee),최성주(Sung-Ju Choi) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.12

본 논문에서는 유한 요소법(FEM) 시뮬레이션을 사용하여 초음파 미세패턴 성형에 사용되는 초음파 공구혼을 이론적 연구와 유한요소해석을 통하여 조사 하였다. 이 방법은 FEM 해석으로 얻어진 초기 설계 추정치에 기초한다. 초음파 미세패턴 성형에 필요한 고유주파수와 공구 혼의 공진주파수를 유한요소해석을 통하여 예측하였다. ANSYS S/W를 이용한 FEM 분석은 초음파 혼의 진동모드 형상의 최적 설계기술로 공진 주파수를 예측하기 위해 사용하였다. 초음파 진동자에 전원이 공급되면, 초음파 진동자에 공급된 전기에너지가 기계적인 운동에너지로 변환되어 진동이 발생하게 된다. 초음파 공구혼의 종진동 에너지를 이용하여 절연시트위에 RFID TAG 패턴 성형을 하게 된다. 초음파 진동을 이용한 마이크로 단위의 형상정밀도 향상을 위해서는 공구혼의 종진동모드만을 이용하여 성형 해야 한다. 본 연구에서는 초음파 마이크로패턴 성형에 필요한 공구혼의 고유진동수 및 진동모드를 갖는 설계변수를 고찰하고, 유한요소해석 결과를 바탕으로 공구혼을 제작함으로써 마이크로패턴 성형에 응용하고자 한다. 유한요소해석 결과를 바탕으로 RFID TAG의 미세패턴 성형을 위한 초음파 공구혼의 최적설계 및 제작에 반영하였다. In this paper, the theoretical research and simulation using the Finite Element Method (FEM) to design and form a micro-pattern for an ultrasonic horn is described. The present method is based on an initial design estimate obtained by FEM analysis. The natural and resonant frequencies required for the ultrasonic tool horn used for forming the fine pattern were predicted by finite element analysis. FEM analysis using ANSYS S/W was used to predict the resonant frequency for the optimum technical design of the ultrasonic horn vibration mode shape. When electrical power is supplied to the ultrasonic transducer, it is converted into mechanical movement energy, leading to vibration. The RFID TAG becomes the pattern formed on the insulating sheet by using the longitudinal vibration energy of the ultrasonic tool horn. The FEM analysis result is then incorporated into the optimal design and manufacturing of the ultrasonic tool horn.