• Title/Summary/Keyword: pin-test

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A Study of Pin-to-pin DC Parametric Test Modeling of VLSI Devices (VLSI 소자의 핀간 DC 파라메터 테스트 모델링 연구)

  • 박용수;송한정;황금주;김철호;유흥균
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.891-894
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    • 1999
  • According to increasing the integration of the device, there are important consideration about the improvement of the reliability in the product. To improve the reliability of the device, the test parameters and test time are increased. There are no pin-to-pin short test and pin-to-pin leakage test in the present test items to analysis the characteristics and reliability of the device. The purpose of the paper is to model the pin-to-pin phenomenon and propose to modify the test method present and to test the new pin-to-pin DC parameters. These modified and additive test items are applied to product test and confirmed to improve the reliability of product test.

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Stress Analysis of IPS Lower bracket

  • Lee, J.M.;Park, K.N.;Chi, D.Y.;Park, S.K.;Sim, B.S.;Lee, H.H.;Ahn, S.H.;Lee, C.Y.;Kim, H.R.
    • Proceedings of the Korean Nuclear Society Conference
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    • 2005.10a
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    • pp.703-704
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    • 2005
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A Study of New DC Pin-to-pin Parametric Test of VLSI Device using Communication (통신용 VLSI 소자의 새로운 편간 DC 파라메터 테스트 연구)

  • 박용수;유흥균
    • The Journal of Information Technology
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    • v.2 no.2
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    • pp.235-250
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    • 1999
  • The test of digital VLSI devices is to insure that the device will perform all of its designed functions while in the worst-case environments. According to increasing the integration of the communication device, there are important consideration about the improvement of the reliability in the product. To improve the reliability of the device, the test parameters and test time are increased. There are basically three kinds of tests: functional, DC parametric, and AC parametric. There are no pin-to-pin short test and pin-to-pin leakage test in the present test items to analysis the characteristics and reliability of the device. The purpose of the paper is to model the pin-to-pin phenomenon and propose to modify the test method and to test the new pin-to-pin DC parameters. These modified and additive test items were applied to product test and confirmed to improve the reliability of product test.

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Quantitative Evaluation of Scratch Related Tool Life for Stamping of UHSS Using Pin-on-Flat Surface Test (Pin-on-Flat Surface Test를 이용한 초고장력강판 스탬핑 금형의 정량적 스크래치 수명평가)

  • Choi, H.S.;Kim, S.G.;Kim, B.M.;Ko, D.C.
    • Transactions of Materials Processing
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    • v.22 no.2
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    • pp.86-92
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    • 2013
  • When stamping ultra-high-strength steel (UHSS), the phenomenon of galling, which corresponds to a transfer of material from the sheet to the tool surface, occurs because of the high contact pressure between tool and workpiece. Galling leads to increased friction, unstable interface conditions, scratches on the sheet and the tool surfaces and, eventually, premature tool surface failures. Therefore, a simple and accurate evaluation method for tool scratching is necessary for the selection of tool material and coating, as well as for a better optimization of process conditions such as blank holder force and die radius. In this study, the pin-on-disc (PODT) and pin-on-flat surface (POFST) tests are conducted to quantitatively evaluate scratch-related tool life for stamping of UHSS. The variation of the friction coefficient is used as an indicator of scratch resulted from galling. The U-channel ironing test (UCIT) is performed in order to validate the results of the friction tests. This study shows that the POFST test provides a good quantitative estimation of tool life based on the occurrence of scratch.

Failure Analysis and Weibull Statistical Analysis according to Impact Test of the Angular Pin for Injection Molding Machines (사출금형기계용 앵귤러핀의 충격시험에 따른 파손분석과 와이블 통계 해석)

  • Kim, Cheol-Su;Nam, Ki-Woo;Ahn, Seok-Hwan
    • Journal of Power System Engineering
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    • v.21 no.3
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    • pp.37-44
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    • 2017
  • In this study, failure analysis of the angular pin for molding machines to aluminum component molding was carried out. SM45C steel was used for the angular pin, it was surface hardened by the induction surface hardening heat treatment. The cross section of damaged angular pin was observed, and micro Vickers hardness value from the fractured part was measured. Brittle fracture was occurred from the fracture surface of angular pin, therefore, impact toughness value was evaluated by V-notch Charpy impact test. It was confirmed that the impact absorption energy was high when was tempered at a high temperature for a long time, and the toughness was slightly increased. Also, 2-parameter Weibull statistical analysis was investigated in order to evaluate the reliability of the measured micro Vickers hardness values and absorbed energy. The micro Vickers hardness and absorbed energy well followed a two-parameter Weibull probability distribution, respectively. The reverse design against angular pin was proposed as possible by using test results.

마멸입자가 운동이력이 다른 금속재료의 마찰 마멸현상에 미치는 영향

  • 황동환;김대은;이상조
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.807-810
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    • 1995
  • The effects of weae particles on the friiction and wear behavior of metals in dry sliding conditions are presented. The tribological test were performed using pure metal specimens which were selected based on their degrees of compatibility and hardness ratio. Friction and wear experiments were conducted using both pin-on-disk and reciprocating pin-on-plate type tribotesters to investigate the effect of motion history. Experimental results show that in the case of dry sliding the frictional behavior observed during pin-on-disk test differed form that of pin-on-reciprocator test for the given set of material pairs. The friction coefficient and wear rate were found to be higher for the pin-on-disk tests. It is suspected that the sliding motion of the pin affects the wear particle dynamics, which in turn influences the frictional behavior. The effect of material pair properties seemed to be relatively smaller than that of wear particles. The results of this paper is expected to aid in the design of mechanical systems for best tribological performance.

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