• Title/Summary/Keyword: on-machine measuring system

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A Study on the Tower type Fizeau Interferometer System with a Fold Minor for Measuring Large Optical Lens Profile (반사경 측정을 위한 타워 방식의 Fold Mirror를 이용한 Fizeau 간섭계 시스템 구성)

  • Lee, Eung-Suk;Lee, Ki-Am;Kim, Ok-Hyun
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.8
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    • pp.21-28
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    • 2008
  • Fizeau interferometer is used for inspecting the lens surface profile accurately. This study is focused on the design and optical measuring techniques for large optical components, such as a reflection mirror for large area lithography or astronomical purpose. A tower type Fizeau interferometer is designed and set up in horizontally with a 45$^{\circ}$ fold mirror which makes easy to align the optical path of heavy interferometer system. To align the optical path, a five-axes stage for the interferometer is required. This study shows a method of the 45$^{\circ}$ fold mirror alignment by using a three-axis stage instead of adjusting the interferometer itself or measuring object. This system will be installed on the large optics polishing machine during the manufacturing process as an on-machine inspection system.

Development of Calibration and Real-Time Compensation System for Total Measuring Accuracy in a Commercial CMM (상용 3차원 측정기의 전체 측정정밀도 교정 및 실시간 보정시스템)

  • 박희재;김종후
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.9
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    • pp.2358-2367
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    • 1994
  • This paper presents techniques for evaluation and compensation of total measuring errors in a commercial CMM. The probe errors as well as the machine geometric errors are assessed from probing of the mechanical artefacts such as shpere, step, and rings. For the error compensation, the integrated volumetric error equations are considered, including the probe error adn the machine geometric error. The error compensation is performed on the absolute scale coordinate system, in order to overcome the redundant degree of freedom in the CMM with multi-axis probe. A interface box and corresponding software driver are developed for data intercepting/correction between the machine controller and machine, thus the volumetric errors can be compensated in real time with minimum interference to the operating software and hardware of a commercial CMM. The developed system applied to a practical CMM installed on the shop floor, and demonstrated its performance.

High Accuracy Measuring System on the Machine Tool by Neasurement Error Compensation (신뢰도를 고려한 측정시스템의 개선)

  • 공민규;정성종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.10a
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    • pp.527-532
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    • 1993
  • MascMC system is one of the MMC system module which performs measuring and checking of machined workpieces on the machine tools. Accuracy of the MascMC was compensated for developing a reliable measuring system by measurement error calibration. Reference gauges, ring gauges, block gauges,squares, spheres and cylindrical squares, were used for error identification and compensation. .+-. 10 .mu. m accuracy with 95% confidence interval was confirmed on the vertical and the horizontal machining center through the large number of experiments.

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On-Machine Measurement System Development of Hole Accuracy using Machine Vision (머신비젼을 이용한 구멍 정밀도의 기상측정시스템 개발)

  • Kim, Min-Ho;Kim, Tae-Yeong
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.5
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    • pp.7-13
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    • 2010
  • The integrity and accuracy of the drilling hole are decided by positional error, diameter error, the roundness, the straightness, the cylindericity, size of the burr, the surface roundness and others. Among these parameters, positional error and diameter error have the most important parameters. The diameter error has been widely studied, but there has been little research done about the positional error due to the difficulty of measuring it. The measurement of hole location and diameter would be performed by CMM(Coordinate Measurement Machine). However, the usage of CMM requires much time and cost. In order to overcome the difficulties, we have developed a hole location and diameter error measuring device using machine vision. The developed measurement device attached to a CNC machine can determine hole quality quickly and easily.

Development of Simulation Software and Design of Measuring Modules for Automatic Measuring System of Moulds (금형의 자동 계측시스템을 위한 측정 모듈설계 및 시뮬레이션 소프트웨어 개발)

  • 김옥삼;구본권
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.71-77
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    • 2001
  • On-machine measuring system of Numerically Control(NC) machines permit computer control of basic material cutting processes of moulds. A part of mould designed within a CAD/CAM system can be manufactured by generation of tool paths by the measuring systems. Since the three-dimensional geometry by AutoCAD of the part is contained in the data base, the manufacturing specialist combined with the appropriate software simulation, can not only create the commands to drive the virtual measuring and standardization of measuring modules but also can check for mistakes by viewing the computer graphics simulation of the tool cutting sequence.

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Design of the Mechanical System for the Cylindrical Workpiece Inspection System (원통형 공작물 검사장치의 기계장치 설계)

  • Whang, Hyun-Seok;Kim, Gab-Soon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.2
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    • pp.22-28
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    • 2019
  • In this study, we describe the mechanical design of the cylindrical workpiece inspection system which that can inspect the workpiece machined in the CNC lathe. The workpiece automatic measuring device is composed of a workpiece aligning mechanism, a workpiece diameter measuring mechanism, and a workpiece height measuring mechanism. If the workpiece machined on the CNC lathe is placed on the pedestal of the cylindrical workpiece inspection system, the workpiece aligning mechanism moves the workpiece to the diameter-measuring position and the height- measuring positions, and the diameter-measuring mechanism and the height- measuring mechanisms sequentially measure the diameter and the height of the workpiece. The cylindrical workpiece inspection system was designed and manufactured. The characteristic experiment was conducted to confirm the operation of the machine tool of the cylindrical workpiece inspection system. As a The result of the characteristic test shows that, the workpiece automatic measuring device operated safely.

Machining Accuracy for Large Optical Mirror using On-Machine Spherical Surface ]Referenced Shack-Hartmann System (On-Machine 구면기준 Shack-Hartmann 장치를 이용한 대형 반사경의 가공 정밀도 연구)

  • Hong Jong Hui;Oh Chang Jin;Lee Eung Suk;Kim Ock Hyn
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.5 s.236
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    • pp.726-733
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    • 2005
  • A spherical surface referenced Shack-Hartmann method is studied for inspecting machining accuracy of large concave mirror This method is so strong to the vibration environment for using as an on-machine inspection system during polishing process of large optics comparing with the interferometry. The measuring uncertainty of the system is shown as less than p-v 150 m. On-machine measured surface profile data with this method is used for feed back control of the polishing time or depth to improve the surface profile accuracy of large concave mirror. Also, the spherical surface referenced Shack-Hartmann method is useful for measuring aspheric such as parabolic or hyperbolic surface profile, comparing that the interferomehy needs a special null lens, which is to be a reference and difficult to fabricate.

A Study on Evaluation of an Automatic Tool Compensation System in CNC Machine Tool (CNC 공작기계에서의 자동공구 보정시스템의 평가에 관한 연구)

  • 정상화;신현성;김현욱
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.371-375
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    • 2001
  • The tool wear that is developed by long-term machining in mold manufacturing with machining center makes a severe influence to the accuracy and the surface roughness. In this reason, tool-wear supervising system which has guaranteed high accuracy and high speed is needed to improve the measurement quality. Touching probe and touch sensor are widely used to measure the tool profile at on-machine measurement. In this paper, using the newly developed electric touch point measuring system, the Automatic Tool Compensation System is developed to correct the error of tool diameter resulted from the wear, and the operating method of this system is also provided.

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A Study on the Error Compensation of Machine Tool Position Using Reference Artifact and On-machine probe (기준물을 이용한 공작기계 위치오차 보정기술에 관한 연구)

  • 조남규;박재준;정성종
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.20-25
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    • 2000
  • In this paper, a methodology of geometrical error identification and compensation for NC machine tool position. We have proposed a reference artifact with which, in measuring the coordinate system of NC machine, the robust coordinate systems are given. The coordinate system of the NC machine could be compensated successfully with the information obtained by measuring the reference artifact and our compensation algorithm. Monte Carlo simulation is used to evaluate coordinate referencing ability and, the uncertainties of the machine tool position is estimated and observed through the compensation process by simulation.

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Non-contacting OMM (On Machine Measurement) based on CAD Model (CAD 모델 기반 비접촉 기상 측정에 관한 연구)

  • 권세진;이정근;박정환;고태조;김선호
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.11
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    • pp.134-141
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    • 2003
  • An industrial product is designed and fabricated, followed by the inspection process in order to check whether it is dimensionally tolerable or not. The machining process produces a part such as a mold or die, in which the three-dimensional coordinate might be measured by a CMM (Coordinate Measuring Machine) for assessment of its dimension. It is not ignorable, however, that a CMM measurement requires a lot of operating time and cost, which has led to many studies on the OMM system. The OMM system can be categorized into contact and non-contact types, and each of which has its own strengths and weaknesses. Non-contacting types generally utilize structured lights, sounds or magnetic fields. Though they show rather poor performance in positional accuracy, the measuring speed is faster than the contacting probes. This paper presents the development of an OMM system based on a non-contacting laser displacement sensing apparatus and CAD model. The system is composed of software modules of center-aligning and measuring, which has been operated and verified on a NC machining center on a shop floor.