• Title/Summary/Keyword: Polishing System

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Development of Automatic Polishing Robot System and Integrated Operating Program (자동 연마 로봇 시스템의 개발 및 통합 구동 환경 구축)

  • 이민철;정진영;고석조;허창훈
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.1
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    • pp.107-117
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    • 2003
  • Polishing a die that has free-form surfaces is a time-consuming and tedious job, and requires a considerable amount of high-precision skill. In order to reduce the polishing time and cope with the shortage of skilled workers, an automatic polishing robot system was developed. The polishing robot system is composed of two subsystems, a three-axis machining center and a two-axis polishing head. The machining center is controlled by a FANUC controller, and the polishing head by DSP controller. The system has five degrees of freedom and is able to keep the polishing tool normal to the die surface during operation. To easily operate the developed polishing robot system, this study developed an integrated operating program in the Windows environment. The program consists of five modules: a polishing data generation module, a code separation module, a polishing module, a graphic simulator module, and a teaching module. And, the automatic teaching system was developed to easily obtain teaching data and it consists of a three dimensional joystick and a proximity sensor. Also, to evaluate the performance of the integrated operating program and the polishing robot system, polishing experiments of a die of shadow mask were carried out.

User-friendly Automatic Polishing Robot System and Its Integrated Operating Program

  • Lee, Min-Cheol;Jung, Jin-Young;Go, Seok-Jo
    • International Journal of Precision Engineering and Manufacturing
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    • v.5 no.3
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    • pp.69-76
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    • 2004
  • Polishing a die that has free-form surfaces is a time-consuming and tedious job, and requires a considerable amount of high-precision skill. In order to reduce the polishing time and cope with the shortage of skilled workers, an automatic polishing robot system was developed. The polishing robot system is composed of two subsystems, a three-axis machining center and a two-axis polishing head. The machining center is controlled by a FANUC controller, and the polishing head by DSP controller. The system has five degrees of freedom and is able to keep the polishing tool normal to the die surface during operation. To easily operate the developed polishing robot system, this study developed an integrated operating program in the Windows environment. The program consists of five modules: a polishing data generation module, a code separation module, a polishing module, a graphic simulator module, and a teaching module. Also, the automatic teaching system was developed to easily obtain teaching data and it consists of a three dimensional joystick and a proximity sensor. Also, to evaluate the performance of the integrated operating program and the polishing robot system, polishing experiments of a die of shadow mask were carried out.

Development of Polishing Machine for Free Form Surface Die (자유 곡면 금형 연마기 개발)

  • 박정훈
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.417-422
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    • 2000
  • In the process of die manufacturing, according to increasing demand of die and molds, the efficient machining of dies and molds has been increased. However, while the cutting process has been automated by the progress of CNC(computer numerical control) and CAD/CAM, the polishing process still depends on the experienced knowledge of an expert. Also, even when workers are skilled in polishing dies. it takes much time to obtain the required roughness and smoothness on the surface of a die. Moreover, many workers gradually avoid doing polishing work because of the poor working conditions caused by dust and noise. Therefore, to improve productivity and to solve the potential shortage of skilled workers, a user-friendly automatic polishing system was developed in this research. The developed polishing system with five degrees of freedom is able to keep the polishing tool normal to the die surface during operation and is able to maintain a pressure constantly by the developed pneumatic system. Also, to evaluate polishing performance of the developend system and find the polishing conditions, the various polishing experiments were carried out.

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Development of an Active Ultra-precision Polishing Machine (능동형 초정밀 폴리싱가공기 개발)

  • 최진경;한성종;박경환;김태형
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.74-78
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    • 2002
  • Ultra-Precision CNC polishing system including on-machine measurement system, a corrective polishing algorithm is developed. The unit removal profiles for various polishing tools and analyzed and tested and dwell time distributions and residual errors for a target removal shape are calculated. The corrective polishing algorithm is tested with various workpieces. This result will be used for the software development of the CNC polishing system.

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Development of User Friendly Integrated Program and Teaching System for Automatic Polishing Robot System (자동 연마 시스템의 사용자 지향형 통합 프로그램 및 자동 교시 시스템 개발)

  • 고석조;이민철;이만형;안중환;김성한;이돈진
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.123-123
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    • 2000
  • Polishing a die that has free-form surfaces is a time-consuming and tedious job, and requires a considerable amount of high-precision skill. In order to reduce the polishing time and cope with the shortage of skilled workers, a user-friendly automatic polishing system was developed in this research. The polishing system with five degrees of freedom is able to keep the polishing tool normal to the die surface. The polishing system is controlled by a PC-NC controller. And, to easily onerate the developed polishing system, this stud)r developed a integrated program in the Windows environment. This program consists of 4 modules: polishing module, a graphic simulator, a polishing data generation module, and a teaching. Also, the automatic teaching system was developed to easily obtain a teaching data. The developed teaching system consists of a three dimensional joystick and a proximity sensor. In order to evaluate stability of the driving program and the leaching system, polishing experiments of the die of saddle shape were carried out.

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Polishing Robot Attached to a Machining Center for a Freely-Curved Surface Die

  • Lee, Min-Cheol;Go, Seok-Jo;Cho, Young-Gil;Lee, Man-Hyung
    • International Journal of Precision Engineering and Manufacturing
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    • v.3 no.4
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    • pp.43-53
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    • 2002
  • Polishing a die that has free-form surfaces is a time-consuming and tedious job, and requires a considerable amount of high-precision skill. In order to reduce the polishing time and cope with the shortage of skilled workers, a user-friendly automatic polishing system was developed. The polishing system is composed of two subsystems, a three-axis machining center and a two-axis polishing robot. The system has five degrees of freedom and is able to keep the polishing tool in a position normal to the die surface during operation. A sliding mode control algorithm with velocity compensation was proposed to reduce tracking errors. Trajectory tracking experiments showed that the tracking error can be reduced prominently by the proposed sliding mode control compared to a PD (proportional derivative) control. To evaluate the polishing performance of the polishing system and to and the optimal polishing conditions, the polishing experiments were conducted.

Development of an Expert System for Supporting Automatic Polishing Operation of Mold and Die (금형의 자동 연마작엉 지원 전문가시스템의 개발)

  • Lee, Tae-Moon;Jeong, Hae-Do;Hwang, Chan-Hae;Cho, Kyu-Kab
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.7
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    • pp.73-84
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    • 1999
  • An advanced expert system for supporting automatic polishing operation of mold and die has been developed. The goal of this system is to minimize the polishing time, the number of polishing and tools used. Also, this paper proposes the advanced concept of the polishing method to perform polishing operation of mold and die, and it has adapted to the orthogonal array method. as a statistical technique, to choose an optimal polishing condition. An expert system consists of the polishing machining database that includes the information of workpiece and polishing tools, and the input/output module.

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Path Control of MR Fluid Jet Polishing System for the Polishing of an Aspherical Lens Mold Core (비구면 렌즈 몰드 코어 연마를 위한 MR Fluid Jet Polishing System의 경로 제어에 관한 연구)

  • Kim, K. B.;Cho, M. W.;Ha, S. J.;Cho, Y. K.;Song, K. H.;Yang, J. K.;Cai, Y.;Lee, J. W.
    • Transactions of Materials Processing
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    • v.24 no.6
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    • pp.431-436
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    • 2015
  • MR fluid can change viscosity in the presence of a magnetic field. A characteristic of MR fluid is reduced scattering during jetting. For these reasons a MR fluid jet polishing system can be used for ultra-precision polishing. In the current paper, the polishing path was calculated considering the aspherical lens profile equation and the experimental conditions for the MR fluid jet polishing system. Then the polishing of an aspherical lens mold core using the MR fluid jet polishing system with the calculated path control was made and the results were compared before and after polishing.

A Study on Corrective Polishing Using a Small Flat Type Polisher (소형 평면공구를 이용한 형상수정 폴리싱에 관한 연구)

  • Kim, Eui-Jung;Shin, Keun-Ha
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.1
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    • pp.99-106
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    • 2002
  • For the development of a ultra-precision CNC polishing system including on-machine measurement system, we study a corrective polishing algorithm. We calculated unit removal profiles for various flat type polishing tools and polishing tool positions. Using these results we simulate the corrective polishing process based on dwell time control. We calculate dwell time distributions and residual error of the polishing simulation method and the FFT calculation method. We test corrective polishing algorithm with an optical glass. The target removal shape is a sine wave that has amplitude 0.3 micro meters. We find this polishing process has a machining resolution of nanometer order and is effective for sub-micrometer order machining. This result will be used for the software development of the CNC polishing system.

Development of a Sensor Information Integrated Expert System for Optimizing Die Polishing (최적 금형연마 가공을 위한 센서 정보 통합 전문가 시스템 개발)

  • 김화영
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.1
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    • pp.128-135
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    • 2000
  • This paper presents a polishing expert system integrated with sensor information which can modify the polishing sequence and conditions initially determined by the system depending on the on-site polishing status. A practical system using AE sensor to detect the on-line polishing status is developed for the rotational polishing and the smoothly curved sur-face. Database and knowledge base for polishing processes are established by using the results of experiments and also expert's experience. Evaluations are performed for a die of headlight lamp by using both the sensor integrated expert sys-tem and the expert system without sensor. The test results show that the sensor integrated expert system provides more optimal polishing conditions since the proposed system takes advantage of on-line sensor information.

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