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이수훈(Soo-Hun Lee),김봉석(Bong-Suk Kim),강태한(Tae-Han Kang),송준엽(Jun-Yeob Song),강재훈(Jae-Hun Kang),서천석(Chun-Seok Seo) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
This paper deals with a prediction method of tool life in view of the reliability assessment. In this study, the flank wear was studied among multi-factors deciding the tool wear state. Firstly, tool life was predicted by correlation between flank wear and cutting time, based on the extended Taylor tool life equation of turning data, including parameters of cutting speed, feed rate, and cutting depth. Secondly, each of cutting conditions of endmilling was equivalently converted to apply ball endmill data to the extended Taylor equation. The web-based reliability prediction program for tool life is being developed as one of reliability assessment programs to for the machine tools.
이수훈(Soo-Hun Lee),김봉석(Bong-Suk Kim),홍민성(Min-Sung Hong),김종민(Jong-Min Kim),JUN NI,박상호(Sang-Ho Park),송준엽(Jun-Yeob Song),이창우(Chang-Woo Lee),하태호(Tae-Ho Ha) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
This paper presents virtual machining system in order to realize turning process in virtual space. A reliable virtual turning process simulation was developed based on the surface shaping system which is capable of considering geometric model, thermal error model, and vibration model. Accuracy of surface shape resulting from proposed machining simulator was verified experimentally. This paper also developed the watchdog agent that continuously assessed, diagnosed, and predicted performance of products and machines in machining. The Watchdog agent extracted feature signal using time-frequency analysis among various signals from multi-sensor and evaluated machining condition using performance confidence value.
정현수(Hyun Soo Jung),이성민(Seong-Min Lee),홍민성(Min-Sung Hong),이수훈(Soo-Hun Lee),박준호(June Ho Park),강동우(Dongwoo Kang),이문구(Moon G. Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
There are increasing needs to inspect micro-pattern of flat panel display (FPD) device such as PDP and LCD. The inspection system should be able to measure over large size mother glass with high productivity and accuracy. Stylus profilers are adopted as an inspection system. To scan over large and heavy FPD device specimen, a “tip-scanning” head for stylus profiler is required. A simple method to realize a tip-scanning system is to miniaturize the whole scanning unit. In this study, a novel stylus profiler is proposed as a tip-scanning stylus profiler. A novel stylus profiler has leaf spring instead of conventional lever & pivot. To measure position of stylus optical senor is used. Linear variable differential transformer is applied to feed-back scanning stage displacement. The stage is actuated by a voice coil motor (VCM). Target performances of the stylus profiler head are stroke over 20㎜ and high accuracy. Specifications of xy-scanning stage are stroke over 250㎜×250㎜ and high bandwidth over 20Hz. The magnetic and elastic characteristics of the mechanism are designed based on finite element (FE) analysis. After fabrication of the head and stage, they are integrated. Current amplifier and feedback controller are also developed. The performance of the stylus profiler is also validated by inspecting standard sample.
마이크로 부품 조립을 위한 평면 3-PRP 정렬기의 역기구학
이정재(Jeong-Jae Lee),유용환(Young-Hwan Yoo),이창우(Chang-Woo Lee),송준엽(Jun Yeob Song),이수훈(Soo-Hun Lee),홍민성(Min-Sung Hong),이문구(Moon G. Lee) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
In the field of micro-factory, there are demanded on aligning micro-components when they assemble an automatic focusing actuator of camera module for cellular phone and mount a dental crown on artificial root. This paper presents inverse kinematics of three degree-of-freedom (DOF) planar parallel actuated manipulators for the alignment. The 3-PRP (Prismatic-Revolute-Prismatic) manipulator is actuated by the voice coil motors (VCMs). The actuators are arrayed 120° apart symmetrically on the horizontal plate. Numerical simulation of the kinematical motion of 3-PRP manipulator is performed by using inverse kinematics. Furthermore, based on these results, the working range of the manipulator is estimated before experiments. Also, this paper presents control algorithm to drive the manipulator. The control algorithm is using a feedback control based on the inverse kinematics, sensor kinematics and governing equation of VCM. The algorithm controls each VCM independently.
이성민(Seong-Min Lee),김봉석(Bong-Suk Kim),송준호(Joon-Ho Song),이수훈(Soo-Hun Lee),이혜진(Hye-Jin Lee),이문구(MoonG Lee),송준엽(Jun-Yeob Song),이창우(Chang-Woo Lee) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user’s fingers while he is talking on the phone. This paper studies a drop test of auto focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. The leaf spring’s deformation is essential for the test because its permanent distortion disables the focusing, and then, a high quality photograph cannot be obtained. Up to now the drop test has been carried out after fabricating real AF actuator. We propose a dropt test model which simulates the drop test based on finite element analysis. This model makes us enable investigate the stress acting on the clamping and curved parts of leaf spring. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned. It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the time and cost for the development of new products.
마이크로 부품 조립을 위한 평면 3-PRP 정렬기의 역기구학
이정재(Jeong-Jae Lee),유용환(Young-Hwan Yoo),이창우(Chang-Woo Lee),송준엽(Jun Yeob Song),이수훈(Soo-Hun Lee),홍민성(Min-Sung Hong),이문구(Moon G. Lee) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
In the field of micro-factory, there are demanded on aligning micro-components when they assemble an automatic focusing actuator of camera module for cellular phone and mount a dental crown on artificial root. This paper presents inverse kinematics of three degree-of-freedom (DOF) planar parallel actuated manipulators for the alignment. The 3-PRP (Prismatic-Revolute-Prismatic) manipulator is actuated by the voice coil motors (VCMs). The actuators are arrayed 120° apart symmetrically on the horizontal plate. Numerical simulation of the kinematical motion of 3-PRP manipulator is performed by using inverse kinematics. Furthermore, based on these results, the working range of the manipulator is estimated before experiments. Also, this paper presents control algorithm to drive the manipulator. The control algorithm is using a feedback control based on the inverse kinematics, sensor kinematics and governing equation of VCM. The algorithm controls each VCM independently.