• 제목/요약/키워드: rolled sheet

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A Study on the Evaluation of Mechanical Behavior of Golf Shafts (골프 샤프트의 역학적 거동 평가에 관한 연구)

  • 정성교;윤형택;정성균;임승규
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.05a
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    • pp.44-47
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    • 2002
  • A liner static and dynamic analysis for a golf shaft, which is made of carbon fiber reinforced composite materials, is presented in this study. Major mechanical parameters of golf shafts such as deflection, torsional angel, frequency of vibration(CPM), and kick point are analyzed by finite element method. The effects of major parameters on the performance of golf shafts are also discussed. The results show that the major parameters of golf shafts are strongly dependent on the material properties of fibers and design pattern of golf shafts. The present results will be useful to design sheet-rolled golf shafts.

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Effect of Deposit Conditions on Composition of Sn-Zn Alloy Deposits (Sn-Zn합금도금 조성에 미치는 도금조건의 영향)

  • 배대철;김현태;장삼규;조경목
    • Journal of the Korean institute of surface engineering
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    • v.34 no.6
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    • pp.537-544
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    • 2001
  • In the present study, tin-zinc alloys were coated on a cold-rolled steel sheet with variations of electrolyte concentration, additives quantity and current density employing the Hull cell and circulation cell simulator. With an addition of additives of 2m1/L, tin-zinc deposits containing 10 to 40 percent Zn revealed a good surface appearance with weak acidic electrolytes. The organic additives suppressed the Sn deposition rate and thus increased the zinc contents in tin-zinc coating layers. The zinc contents in the tin-zinc coating layers depended almost linearly on the concentrations of metal ions of tin and zinc. Temperature of the electrolyte affected the composition tin-zinc coating layer. However, the concentration of complexants revealed little effectiveness. The surface morphology of tin-zinc coating showed dense tin and zinc phases with fine equiaxed grains with the high current density.

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Development of Texture in Aluminum 1100 Sheets during Asymmetrical Rolling. (비대칭 압연시 알루미늄 1100 판재에서 집합조직 형성)

  • 지영규;정효태;허무영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.105-108
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    • 2003
  • Sheets of aluminum alloy 1100 were asymmetrically cold rolled in a rolling mill with different roll speeds. In order to promote the shear deformation during asymmetrical rolling, cold rolling without lubrication was performed. The evolution of texture components during asymmetrical rolling was investigated by the calculation of the orientation distribution function (ODF) using the monoclinic sample symmetry. The strain state during asymmetrical rolling was tackled by means of FEM calculations. Asymmetrical rolling gave rise to the development of pronounced strain gradients throughout the thickness layers which resulted in the formation of strong texture gradients in the aluminum sheet.

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A Study on the In-plane Displacement Measurement of Spot welded Joints by Electronic Speckle Pattern Interferometry Method (레이저 스패클 간섭법에 의한 점 용접부의 면내변위 측정에 관한연구)

  • 성백섭
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1997.04a
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    • pp.48-53
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    • 1997
  • Electronic Speckle Pattern Interferometry(ESPI) using the Model 95 Ar laserm, a video system and an image processor was applied to the in-plane displacement measurements. Unlike traditional strain gauges or moire method, ESPI method requires no special surface preparation or attachments and can be measured in-plane displacement with no contact and real time. In this experiment wpecimen was loaded in parallel with a loadcell. The specimen was the cold rolled sdteel sheet of 2mm thickness, which was attached strain gauges. The study provides an example of how ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI compare with the data which was measured by strain gauge method in tensile testing.

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Hardening of Steel Sheets with Orthotropy Axes Rotations and Kinematic Hardening

  • Hahm, Ju-Hee;Kim, Kwon-Hee;Yin, Jung-Je
    • International Journal of Precision Engineering and Manufacturing
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    • v.1 no.1
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    • pp.91-97
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    • 2000
  • Anisotropic work hardening of cold rolled low carbon steel sheets is studied. The experiments consist of two stage tensile prestraining and tensile tests. At the first prestraining, steel sheets are streteched along the rolling direction by 3% and 6% tensile strains. The second prestrains are at 0${\cric}$, 30${\cric}$, 60${\cric}$to the rolling directions by varying degrees. Tensile tests are performed on the specimens cut from the sheets after the two stage prestraining. A theoretical framework on anisotropic hardening is proposed which includes Hill's quadratic yield function, ziegler's kinematic hardening rule, and Kim and Yin's assumption on the rotation of orthotropy axes. The predicted variations of R-values with second stage tensile strain are compared with the experimental data.

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Development of Deformation Texture in Aluminum Sheets during Asymmetrical Rolling with a Roll Speed Ratio of 1.5/l.0 (롤속도 비 1.5/l.0 비대칭 압연 시 알루미늄 판재에서 변형집합조직의 형성)

  • 지영규;정효태;허무영
    • Transactions of Materials Processing
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    • v.12 no.3
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    • pp.244-250
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    • 2003
  • Sheets of aluminum alloy 1100 were asymmetrically cold rolled in a rolling mill with different roll speeds. In order to promote the shear deformation during asymmetrical rolling, cold rolling without lubrication was performed with a roll speed ratio of 1.5/l.0. The evolution of texture components during asymmetrical rolling was investigated by the calculation of the orientation distribution function (ODF) using the monoclinic sample symmetry. The strain state during asymmetrical rolling was tackled by means of FEM calculations. Asymmetrical rolling gave rise to the development of pronounced strain gradients throughout the thickness layers which resulted in the formation of strong texture gradients in the aluminum sheet.

Process and Die Design for the Forming of Flanged Thrust Engine Bearings (플랜지를 가진 추력 엔진베어링의 성형공정 및 금형 설계)

  • 김형종;곽인구
    • Transactions of Materials Processing
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    • v.9 no.5
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    • pp.478-485
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    • 2000
  • This study aims to Improve the productivity in forming of flanged thrust engine bearings from two kinds of laminated sheet materials by integrating the forming processes or by reducing the number of the subsequent sizing and machining processes or by modifying the forming tools used. For steel-Al rolled blank, a design scheme for the one-step forming operation and the geometry of the tool set required is suggested and is verified its usefulness by the finite element simulation. And for steel-Cu sintered blank, the results of experiment and finite element analysis show that it is possible to improve the dimensional accuracy of formed products and to reduce the number of sizing processes just by modifying the shape and dimensions of initial blanks and flange forming dies, and by controlling the spring force.

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Effect of Temperature and Immersion Time on the Environmental Adhesive Strength of Adhesively Bonded Joints of Rolled Steel Sheet (압연강판 접착제 접합부의 환경 접합강도에 미치는 온도 및 침수시간의 영향)

  • Song, Jun-Hee;Lee, Hee-Jae;Lim, Jae-Kyoo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.12
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    • pp.2662-2669
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    • 2002
  • Recently structural applications of adhesive bonding method have been increased extensively in automobile industry. Adhesively-bonded joints which are used in automobile field are exposed to various environmental conditions. In this study, several environmental factors were concerned to evaluate their effects on the adhesive strength such as air temperature, water temperature, exposed time in water. The specimens are exposed for 1, 10 and 100 hours at various air temperatures to evaluate the effects of the air and water temperature on the adhesive strength. It is proved that the adhesive strength decrease with rising the air and water temperature, and the adhesive strength decrease steeply at the higher temperature with increasing the exposure time in water.

A safety evaluation on the loading and vibration test for transport freight car of cold rolled coil sheet (냉연코일강판 수송용 화차의 안전성 평가를 위한 차체하중시험과 진동시험)

  • 김원경;정종덕;윤성철;홍용기
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1499-1502
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    • 2003
  • This paper describes the result of carbody and vibration test for freight car. The purpose of the test is to evaluate an safety which carbody structure shall be considered fully sufficient rigidity so as to load a freight car under maximum load and operating condition on line track. The test carbody is constructed by RS korea co., LTD. in accordance with KNR specfication. The test cases of the carbody is tested the vertical load and compressive load to verify the strength and stillness. The vibration test is tested for analysis and evaluation of vibration, to allow for the fact that mechanical vibration in railway vehicles have specific characteristics.

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A study on the cutting punch shape about roll forming process (롤 포밍 공정에서 컷팅 펀치 형상에 관한 연구)

  • Cheong, Mun-Su
    • Design & Manufacturing
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    • v.10 no.3
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    • pp.34-38
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    • 2016
  • Roll forming is a continuous production process that is mass-produced. The roll forming process is produced in various forms. The special feature of roll forming is a continuous production. Therefore, the process of cutting the material is essential. The troubles in a shearing process affects the low productivity. Accordingly, it is important to reduce the factors that inhibit the material flow. And it is difficult to apply the common shear angle. Because it is not a simple forms, such as a progressive die. This study shows how to select the angle of a shear punch and the shape of a cutting punch in the product with a specific shape. Conclusively through three different model, it is advantageous to apply the different shear angle and clearance along the forms.