• Title/Summary/Keyword: Checking Fixture

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A Case Study on the Compatibility Analysis of Measurement Systems in Automobile Body Assembly

  • Lee, Myung-Duk;Lim, Ik-Sung;Sung, Chun-Ja
    • International Journal of Reliability and Applications
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    • v.9 no.1
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    • pp.7-15
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    • 2008
  • The dimensional measurement equipment, such as Coordinate Measurement Machine (CMM), Optical Coordinate Measurement Machine (OCMM), and Checking Fixture (CF), take multiple dimensional measurements for each part in an automobile industry. Measurements are also recorded under different measurement systems to see if the responses differ significantly over these systems. Each measurement system (CMM, OCMM, and CF) will be considered as different treatments. This set-up provides massive amounts of process data which are multivariate in nature. Therefore, the multivariate statistical analysis is required to analyze data that are dependent on each other. This research provides step by step methodology for the evaluation procedure of the compatibility of measurement systems and clarify a systematic analyzation among the different measurement system's compatibility followed by number of case studies for each methodologies provided.

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Development of Multipurpose Welding Jig for Sub-Frame (서브 프레임 제작용 다목적 용접지그 개발)

  • Shin, H.G.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.4
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    • pp.131-136
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    • 2011
  • In commercial vehicle, sub-frame which equipped in main frame supporting dump deck and oil tanker. This is the main structure for all equipment which including joint function. Sub-frame is made by welding process, this susceptible to deform and crack by its longitudinal size. Also various kind of sub-frame make it difficult to standardization in manufacturing process and exclusive jig is not adapted yet. Frame size is over 6~8m and weight is more than 300kg this make re-work more difficult. If manufacturing company made precise sub-frame, this is not only convenient for customers but also save the company money by reducing the working time. In this study manufacture the sub-frame be suitable for its main function and develop exclusive welding jig for obtain checking fixture function as well.

Design and Development Digital Line Checker for the Pin Number Testing of Circuit Board Inspection System (디지털 배선 검사기 설계 및 개발에 대한 연구)

  • Park, Young-Seok;Jung, Woon-Ki;Park, Dong-Jin;Kim, Sung-Deok;Ko, Yun-Seok;Ryu, Chang-Keun
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.96-98
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    • 2002
  • This paper proposes the digital pin line checker which can extremely improve the efficiency of the pine line checking using a micro processor. The line checker is designed which can check efficiently up to maximum 2048 pin. Alarm busser is designed ringing real-timely the case that the pin line is connected differently with real node number. Accordingly the comparing and identifying work visually the node number showing on the displaying board with real node number is avoided after the electronic stimulus enforce to the pin of the fixture by the test engineer. The digital line checker is designed based on the 8051. And the effectiveness and accuracy of the proposed line checking strategy is tested by simulating the several error connections for pin lines on the small scale board.

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Development of the Injection Molded Ball Seat for Automobile Suspension (자동차 서스펜션용 볼 시트 사출성형품 개발)

  • Ye, Sang-Don;Min, Byeong-Hyeon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.4
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    • pp.50-56
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    • 2011
  • Injection molding process is one of the popular manufacturing methods to produce plastic parts with high efficiency and low cost. Ball seat for automobile suspension is made by an injection molding process as a part to support pivot function of ball joint consisted of ball stud and housing. It is necessary for a ball seat to have a dimensional stability in the three dimensional inner area to be contacted with ball stud. In this paper, the dimensional stability of inner surface is indirectly analyzed by checking the difference of inner diameter around the circumferential direction and the thickness variation at the top part of ball seat. Measurement was performed by using the coordinate measuring machine and the fixture to hold ball seat. Optimization of injection molding processes such as injection time, cooling time and temperatures of cylinder barrel was derived to reduce the difference of inner diameter and the thickness variation at the top part of ball seat based on the Taguchi method.

Development of Kinematic Calibration System for a Parallel-typed Machining Center Tool (병렬기구형 공작기계의 보정 시스템 개발)

  • Kim, Tae-Sung;Park, Kun-Woo;Yoon, Tae-Sung;Lee, Min-Ki
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.521-526
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    • 2001
  • This research develops a low-cost and high accurate kinematic calibration method for a parallel typed machining center tool. A planar table is used for a mechanical fixture restricting the platform to place at the constrained pose and a low-cost and high accurate digital indicator is employed for a device checking if the constrained movement is satisfied within the established range. The kinematic parameters calibrated with respect to a single plane aren't influenced from the misalignment of the plane. A parameter observability is successfully obtained even through one planar constraint, which guarantees that the kinematic parameters is estimated by minimizing the cost function.

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A Dual Vacuum Wafer Prealigner and a Multiple Level Structure (2단 진공 웨이퍼 정렬장치 및 다층 구조 설계)

  • Kim, H.T.;Choi, M.S.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.8 no.3
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    • pp.14-20
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    • 2011
  • This study aims at aligning multiple wafers to reduce wafer handling time in wafer processes. We designed a multilevel structure for a prealigner which can handle multiple wafer simultaneously in a system. The system consists of gripping parts, kinematic parts, vacuum chucks, pneumatic units, hall sensors and a DSP controller. Aligning procedure has two steps: mechanical gripping and notch finding. In the first step, a wafer is aligned in XY directions using 4-point mechanical contact. The rotational error can be found by detecting a signal in a notch using hall sensors. A dual prealigner was designed for 300mm wafers and constructed for a performance test. The accuracy was monitored by checking the movement of a notch in a machine vision. The result shows that the dual prealigner has enough performance as commercial products.

Case Study on the Compatibility of Measurement Systems with Part-to-part Variations in Automobile Industry

  • Lee, Myung-Duk;Lim, Ik-Sung;Sung, Chun-Ja
    • International Journal of Reliability and Applications
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    • v.9 no.1
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    • pp.17-30
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    • 2008
  • Analysis of measurement systems is important to determine if the measurement process is adequate to measure the part-to-part variability in the process. Control chart techniques provide an effective, and easy-to-use method for performing this analysis. However, application with the real data for the evaluation procedure for multiple measurement systems have not been demonstrated. This research will provide a methodology for the evaluation of part-to-part variation and variation of different measurement systems step by step followed by number of case studies for each methodologies provided.

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A Case Study of the Design of Robot Welding Station in an Excavator Factory Using 3D Simulation (굴삭기공장의 로봇용접 작업장 설계에 대한 3D 시뮬레이선 사례 연구)

  • Moon, Dug-Hee;Cho, Hyun-Il;Baek, Seung-Geun
    • Journal of the Korea Society for Simulation
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    • v.15 no.1
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    • pp.51-58
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    • 2006
  • Virtual Manufacturing is a powerful methodology for developing a new product, new equipment and new production system. It enables the checking errors in design before production. This paper is a case study of virtual manufacturing in an excavator factory. The final welding operations of the boom and the rotating table of upper body are selected for application. 3D models of parts and fixtures are developed with $CATIA^{(R)}$ and 3D simulation models are developed with $IGRIP^{(R)}$. These models are used for verifying the design of fixture and for the motion design of robot. As a result, the manual welding systems are replaced by automatic systems and many design errors are corrected in the design phase, which reduces the developing cost and time.

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