• Title/Summary/Keyword: Roll Over

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Matching Technology Between Nip Roll Characteristics and Quality of Print Pattern in Roll-to-Roll Printed Electronics Systems (롤투롤 전자인쇄 시스템에서 Nip Roll 의 특성에 따른 인쇄 패턴의 품질에 대한 매칭기술 연구)

  • Choi, Jea-Won;Shin, Kee-Hyun;Lee, Chang-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.2
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    • pp.173-178
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    • 2012
  • Currently, active research is being performed on printing of electronic devices such as RFID devices, flexible displays, solar cells, and e-paper. This technique has several advantages over existing technologies such as lithography and etching. In particular, RFID devices, flexible displays, solar cells, and e-paper require flexibility and a mass production system. Thus, attention is being focused on the roll-to-roll process. High quality should be guaranteed in the roll-to-roll printed electronics systems, and good thickness and roughness qualities must be ensured. Experimental design was applied to this problem to analyze the main effects and interaction effects of various factors. Matching technology between the nip roll characteristics and the quality of the print pattern in roll-to-roll printed electronics systems was proposed to improve the printing quality.

Effects of Varying Contact back-up Roll on the strip flatness (VCR 롤이 판평판도에 미치는 영향)

  • Chen, Xianlin;Zhang, Jie;Yang, Quan;Zhang, Quingdong
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1998.03a
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    • pp.144-147
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    • 1998
  • VCR is a back-up roll with a special contour which leads to the length of the contact line between back-up roll and work becones self adjustable in accordance with the width of the strip. The simulation of a finite element model and the on-line test at production mill demonstrate that the VCR roll may keep the crown of the roll gap relatively stable, and at same time, permit the rolling pressure to be adjusted over a wider range, and increase the effect of work roll bending on the roll gap. The VCR rolls have been successfully used at the first stands of two largest cold rolling mills in China, and on-line test has been done at a wide hot strip finishing train. The use of VCR roll has created favorable conditions for subsequent rolling passes and the achievement of better flatness quality.

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Analysis of effects of the roll forming process parameters of side sill (롤 포밍용 차체 부품 공정 변수 영향도 해석)

  • Kim, D.K.;Sohn, S.M.;Lee, K.H.;Lee, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.10a
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    • pp.310-313
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    • 2007
  • In roll forming process, a sheet metal is continuously progressively formed into a product with required cross-section and longitudinal shape, such as a circular tube with required diameter, wall-thickness and straightness, by passing through a series of forming rolls in arranged in tandem. In this process, each pair of forming rolls installed in a forming machine play a particular role in making up the required cross-section and longitudinal shape of the product. In recent years, that process is often applied to the bumper rail in the automotive industries. In this study, a optimal roll flower model and proper roll-pass sequence can be suggested by analyzing courcenter strain and longitudinal strain according to the roll-pass with FEM simulation. And also effects of the process parameters on the final shape formed by roll forming defects a evaluated.

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The Study of Manufacturing Technology for Front Side Member Lower (고강도 차체부품 제작 기술에 대한 연구)

  • Park, S.E.;Kim, D.K.;Lee, Y.J.;Kim, K.H.;Lee, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.10a
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    • pp.293-296
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    • 2009
  • In roll forming process, a sheet metal is continuously progressively formed into a product with required cross-section and longitudinal shape, such as a circular tube with required diameter, wall-thickness and straightness, by passing through a series of forming rolls in arranged in tandem. In recent years, that process is often applied to the bumper rail in the automotive industries. In this study, a optimal front side member manufacturing technology, model deign and proper roll-pass sequences can be suggested by forming number of roll-pass and bending angle. And also effects of the process parameters on the final shape formed by roll forming defects were evaluated.

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Improvement of Edge Drop in Cold Rolled Steel by Tapered Work Roll in Tandem Cold Mill (탠덤압연설비에서 테이퍼롤 채용에 의한 냉연강판 에지드롭 개선)

  • 한석영;이준정
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.1
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    • pp.34-43
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    • 1994
  • In order to improve thickness profile of cold rolled steel strip, a computer simulation and actual cold rolling experiments on a 4-high tandem cold mill were carried out. In this study, tapered barrel end at top work roll and incurved barrel body at bottom work roll were examined for reducing edge drop and threading of stripe. Also, the most effective stand of tandem cold mill and magnitude of optimal taper crown at several stand were investigated under a typical rolling condition. From actual rolling experiments, it was verified that thickness deviation over strip width could be improved up to 1.06% by applying tapered and incurved work roll only at the second and up to 0.89% by applying them at both the second and the third stand.

Numerical Approach to Optimize Piercing Punch and Die Shape in Hub Clutch Product (허브클러치 제품의 피어싱 펀치 및 금형 형상 최적화를 위한 수치접근법)

  • Gu, Bon-Joon;Hong, Seok-Moo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.9
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    • pp.517-524
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    • 2019
  • The overdrive hub clutch is attached to a 6-speed automatic transmission to reduce fuel consumption by using the additional power of the engine. This paper proposes a means to minimize the load and roll-over ratio on the punch during the piercing process for the overdrive hub clutch product. Die clearance, shear angle, and friction coefficient, which can affect the load and roll-over ratio of the punch during processing, were set as the design variables. Sensitivity analysis was also conducted to determine the influence of each design variable on the punch load and roll-over ratio. As a result, shear angle, friction coefficient and die clearance were found to be sensitive to load and roll-over ratio. The punch load and roll-over ratio were set as the objective function and the equation of each design variable and objective function was derives using the Response Surface Method. Finally, the optimal value of the design variables was derived using the Response Surface Method. Application of this model to finite element analysis resulted in 22.14% improvement in the roll-over ratio of the punch load and material.

Extension of Measurement Range of Gyro Sensor Data (누적형 자이로 센서 데이터의 최대측정영역 확장 방법)

  • Oh, Shi-Hwan;Kim, Jin-Hee
    • Aerospace Engineering and Technology
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    • v.11 no.2
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    • pp.39-48
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    • 2012
  • In case a measurement output of gyro sensor is an accumulated angle counts, it is usually provided as a binary bit counter which is allowed to roll-over at its maximum or minimum value. And it is a well known fact that the roll-over behavior restricts the measurement range of the processed sensor output below the actual measurable range of sensor hardware itself. In this study, a conventional sensor data processing method for a gyro with an accumulated angle output is introduced. And also, an improved method which can extend the processed output range over the conventional one is proposed. It is also derived that the increased range depends on the variation speed of a input signal. Finally, the derived equations and the performance of the proposed algorithm are verified using a computer simulation.

The Study of Manufacturing Technology for a Sill Side by Roll Forming (다단 성형 기술을 이용한 차체 부품 개발)

  • Kim, D.K.;Han, S.W.;Jeon, H.J.;Cheon, S.H.;Moon, Y.H.
    • Transactions of Materials Processing
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    • v.23 no.6
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    • pp.376-379
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    • 2014
  • During roll forming a sheet metal is continuously and progressively formed into a product of the required cross-section and longitudinal shape. An example product is a circular tube with a required diameter, wall-thickness and straightness. Roll forming occurs by passing the sheet through a series of forming rolls that are arranged in tandem. Each pair of forming rolls in the roll forming line plays a particular role in obtaining the required cross-section and longitudinal shape in the product. In recent years, that process is often applied to car body parts by automotive industries. In the current study, an optimal model design and proper roll-pass sequences as well as the number of forming rolls and bending angles were used to produce a sill side. The effects of the process parameters on the final shape formed by roll forming defects were evaluated.

Roll-to-roll process for large-area transfer of Ag nanowire electrode (은 나노 와이어 전극의 대면적 전사를 위한 롤 투 롤 공정)

  • Park, Yangkyu;Kim, Jae Pil;Kim, Wan Ho;Jung, Kang;Jeong, Ho-Jung
    • Journal of the Korean institute of surface engineering
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    • v.55 no.3
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    • pp.173-179
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    • 2022
  • This study presents a roll-to-roll process which is capable of Ag nanowire (AgNW) transfer from polyethylene terephthalate (PET) film to polycarbonate (PC) film. We developed a roll-to-roll machine that consists of two film suppliers, a coater of photo-curable resin, a film laminator, an ultraviolet (UV) exposure unit, and a film winder to facilitate large-area electrode transfer between different flexible substates. Using the process, optimal fabrication condition was investigated by parametric experiments in terms of the UV exposure time, number of thermal cycling, and exposure time of high temperature and humidity. A fabricated AgNW on PC film showed sheet resistance of 52 Ω/sq and optical transmittance of approximately 80 % over a range of visible light.

Design of missile roll controller based on the fuzzy logic (퍼지논리를 이용한 유도탄 롤 제어기 설계)

  • 전병율;남세규;송찬호
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.1063-1067
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    • 1993
  • Fuzzy logic is applied to a roll autopilot for missiles. Fuzzy rules are made so that the response duplicates that of the conventional control law for some flight condition. A scaling factor of the fuzzy controller is then scheduled by the missile velocity and altitude information to cope with the variation of the roll dynamics from that flight condition. By computer simulations and calculation of the stability margin, it is shown that the fuzzy control is robuster than the conventional one over the flight envelope even though two control laws work similarly for some flight conditions.

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