• Title/Summary/Keyword: Separation Force

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A Study on the design of separation force measuring system for improvement of semiconductor productivity

  • Park, Kun-Jong
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.10
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    • pp.1-7
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    • 2017
  • In this paper, the separation force measuring system is developed. The separation force aries due to adhesive strength between semiconductor epoxy molding compound(EMC) and the metal plate in semiconductor formed plate. In general, when removing the metal plate in semiconductor formed plate from semiconductor epoxy molding compound, excessive strength can result in a increase in semiconductor defect rates, or conversely, if too little force is exerted on the metal plate in semiconductor formed plate, the semiconductor production rates can decrease. In this study, the design criteria for the selection of the AC servo motor, the role of the ball screw, the relationship between the load cell and the ball screw, and the rate of deceleration are given. In addition, minimizing the reject rate of semiconductors and maximizing the semiconductor production rate are achieved through the standardization of the collected separation force data measured by the proposed system.

Reducing Separation Force for Projection Stereolithography based on Constrained Surface Technique (규제액면기법의 전사방식 광조형 시스템을 위한 이형력 감소)

  • Kim, Hye Jung;Ha, Young Myoung;Park, In Baek;Kim, Min Sub;Jo, Kwang Ho;Lee, Seok Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.9
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    • pp.1001-1006
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    • 2013
  • Projection-based stereolithography is divided into constrained-surface and free-surface type according to controlling liquid layer. The constrained-surface type has a uniform layer thickness due to the use of a projection window, which covers the pattern generator such as liquid crystal display. However, the adhered resin on the projection window causes trouble and requires great separation force when the cured layer is separated from the window. To minimize the separation force, we developed a system to measure the separation force. The influence of material covering the pattern generator and the resin temperature is investigated in the system. Several structures according to the resin temperature and the velocity of z-axis elevation are compared. As a result, the fabrication condition to minimize the separation force reduces the process time.

An Analysis of Hot-Rolling in the Twin-Roll Strip Casting Process by using the Slab Method (슬랩법을 이용한 쌍롤식 박판주조 공정의 열간 압연 해석)

  • Shim, Hyun-Bo
    • Transactions of Materials Processing
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    • v.3 no.1
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    • pp.63-83
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    • 1994
  • In this paper, the slab method have been applied to investigate the strip casting process in which hot coil is produced from molten steel directly. In the twin roll strip casting process, molten steel supplied by the nozzle cools and solidifies due to the heat extraction effect of the rolls and hot rolling of the solidified shell takes place simultaneously. The analysis of hot rolling has been carried out by using the existing results of solidification analysis for the twin roll strip casting process. The current slab method provides basic design data such as roll separation force, rolling torque, rolling power as well as end dam separation force which are required to design strip caster. The effect of friction on the basic process parameters are investigated also. It is shown that the use of appropriate friction coefficient is important and that the characteristics of hot rolling in the twin-roll strip casting process is quite different from the conventional hot rolling processes.

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Stability Evaluation during Transportation of Caisson for Breakwater (방파제용 대형 케이슨 운반에 따른 안정성 평가)

  • Seok, Jun;Park, Jong-Chun;Heo, Jae-Kyung;Kang, Heon-Yong;Bae, Yoon-Hyeok;Kim, Moo-Hyun;Kang, Yoon-Koo
    • Journal of Ocean Engineering and Technology
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    • v.24 no.4
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    • pp.13-22
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    • 2010
  • While a caisson used for breakwater is carried by a floating dock, accompanying stability problem by its existing motions in the dock is quite important and should be pre-checked against sea environmental condition. In the stability analysis, the acceleration, velocity, angle of roll and pitch motions are important to calculate frictional force and separation force. If separation force becomes bigger than frictional force, serious collision may be occurred between caisson and floating dock. In this study, stability evaluation during the transportation of a caisson on floating dock for breakwater was performed by using a commercial program, HydroD and CHARM3D/HARP.

Calculation Method and Influence Factor for Speed Change of a Vehicle Impacting Small Sign Post (소형지주에 충돌하는 차량의 속도변화 산정방법과 영향인자)

  • Ko, Man-Gi;Kim, Kee-Dong;Jun, Sung-Min;Sung, Jung-Gon
    • Journal of the Korean Society of Hazard Mitigation
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    • v.8 no.4
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    • pp.47-52
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    • 2008
  • Important factor in designing a breakaway sign support is the velocity change of the impact vehicle. It is measured from the crash test or can be calculated by 3-D Finite Element Analysis. It can also be calculated with relative ease utilizing energy and momentum conservation. In this paper a formula to calculate the velocity change of a car during the time of impact against a small sign is derived utilizing the energy and momentum balance. Using the formula, parametric studies were conducted to find that impact speed, separation force and Breakaway Fracture Energy(BFE) of the posts which represent the degree of fixedness to the foundation are the important factor to vehicle's speed change. It is shown that speed change is larger in the lower speed impact and to the posts with large separation force and BFE.

Optimum Design of Lock Snap-fit Using Design of Experiment (실험계획법을 이용한 이탈방지 스냅핏의 최적설계)

  • Son, In-Seo;Shin, Dong-Kil
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.8
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    • pp.378-385
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    • 2017
  • This study investigated the design of a snap fit, which is widely used for fastening plastic parts. We analyzed the assembly mechanism of a lock snapfit, measured the assembly force and separation force based on the design of experiments, and derived a regression equation through an analysis of variance. The response surface methodology was also used. Polybutylene terephthalate was used to fabricate specimens, and the assembly force and separation force were measured using a micro-tensile tester. The length, width, thickness, and interference were considered as factors. A second-order regression model was used to derive the regression equation. The assembly force decreased with increasing length and width, but it increased with increasing thickness and interference. The finite element method was used to analyze the assembly mechanics. The width decreased the assembly force by increasing the ductility. The influences of the factors for low assembly force and high release force were shown to be opposite to each other. It was necessary to design a structure that minimized the assembly force while maintaining an appropriate level of separation force.

A Study on the Estimation of Separation Forces of a Power Steering Hose Assembly (동력조향장치 호스 조립품의 이탈력 추정에 관한 연구)

  • Kim Hyungje;Kim Byungtak;Yoon Moonchul
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.4
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    • pp.190-196
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    • 2005
  • The power steering hose assembly is usually manufactured through the swaging process, which is conducted to connect a hose with metal fittings. In this process the hose is inserted into metal components, the sleeve and the nipple, and compressed in the radial direction by the jaws to clamp the hose with metal components. In case that the clamping force is small, the oil in the hose can leak locally under the severe operating conditions. To confirm the clamping force requirements, the measurement of separation force in longitudinal direction of the hose is usually performed. In this study, the swaging process of a hose is simulated with the finite element method, to investigate the effect of friction coefficient on the separation fDrce. The results interpretations are ffcused on the inner rubber component, and also a formula is proposed to estimate the separation farces with respect to friction coefficients.

A Study on the Clamping Force of an Automotive Air-conditioning Hose according to the Friction Coefficient (마찰계수를 고려한 자동차용 에어컨 호스의 체결력에 관한 연구)

  • Baek, Jae-Kwon;Kim, Byung-Tak
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.3
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    • pp.39-46
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    • 2011
  • The automotive air conditioning hose is used for connecting the components of air conditioner in a vehicle. The hose is usually manufactured by the swaging process to connect the rubber hose with the metal fitting at the end of the hose. In case that the clamping force is small, the refrigerant gas in the hose can leak locally under the severe operating circumstances. The practical test of clamping force is performed by means of the measurement of separation force. In this study, the swaging process of a hose is simulated with the finite element method, to investigate the effect of friction coefficient on the clamping force. The contact condition is used in consideration of real manufacturing process, and the material properties for the Mooney-Rivlin model is obtained by the experimental results. The result interpretations are focused on the contact forces, which is displayed graphically with respect to friction coefficient, on the surfaces between the hose and the metal fittings.

The Development of Pyrotechnically Releasable Mechanical Linking Device Using Pressure Cartridge (압력카트리지를 이용한 파이로 분리장치 개발)

  • Kim, Dong-Jin;Lee, Yeung-Jo;Ko, Young-Kyun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.340-343
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    • 2011
  • Explosive bolts are reliable and efficient mechanical fastening devices having the special feature of a built-in release. The disadvantage of explosive bolt lies in that it is based on the high explosive effect of a pyrotechnic charge. The aim of the present work is to propose a pyrotechnically releasable mechanical linking device for two mechanical elements that does not suffer from such drawbacks. The pyro-lock using the pressure cartridge has the release characteristic without fragmentation and minimum pyro-shock. The present work is focused on the design, the interpretation of structure, the separation mechanism, separation force, and the results of various tests.

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