• Title/Summary/Keyword: Sheared Surface

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Influence of Working Variables in Simplified Gear Shaving Process (단순 기어형상의 셰이빙가공에 있어서 작업 변수의 영향)

  • Lee, K.S.;Jung, J.Y.;Kim, J.H.
    • Transactions of Materials Processing
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    • v.19 no.5
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    • pp.290-295
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    • 2010
  • Shaving technology is one of the significant metal forming technologies which can make the smooth and fine sheared surface of products after shearing process. The sheared surface on the side wall of the cutting edge is very important because it functions as a basic surface for measuring the dimensions of product. Effective sheared surface after shaving can be influenced by several working variables such as shaving allowance, shaving clearance, type of material and profile of cutting edge. The influence of these variables on shaving characteristics was investigated in this study. A cut-off die to make the simplified gear-shaped products was manufactured. Three kinds of sheet metals (AL5052, SPCC and SAPH440) of 3mm thickness were firstly sheared and then shaved for four shaving allowances and three sharing clearances. It was shown through experiments that the optimum working condition to give the maximum effective sheared surface in shaving was found ; Shaving allowance is 0.2mm and Shaving clearance is 0.01mm.

A Study on the Shear Deformation Behavior of Inner Structure-Bonded Sheet Metal (접합판재의 전단 변형거동에 관한 연구)

  • Kim J. Y.;Chung W. J.;Yang D. Y.;Kim J. H.
    • Transactions of Materials Processing
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    • v.14 no.3 s.75
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    • pp.257-262
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    • 2005
  • In order to improve the quality of the sheared surface in cutting of inner structure bonded sheet metal the cut-off operation is mainly investigated, which is the typical shearing process in sheet metal forming technology. The sandwich sheet metals considered have inner structure which is constructed in the form of crimped expanded metal and woven metal. The inner structure is bonded between solid sheet by resistance welding or adhesive bonding. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results we found that the influence of sheared position can be observed and explained clearly and this result can be utilized to get the better sheared surface.

A Study on the Shear Deformation Behavior of Inner Structure-Bonded sheet metal (접합판재의 전단 변형거동에 관한 연구)

  • Kim J. Y.;Kim J. H.;Chung W. J.;Yang D. Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.11a
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    • pp.33-38
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    • 2004
  • In order to improve the quality of the sheared surface in cutting of inner structure bonded sheet metal the cut-off operation is mainly investigated, which is the typical shearing process in sheet metal forming technology. The sandwich sheet metals considered have inner structure which is constructed in the form of crimped expanded metal and woven metal. The inner structure is bonded between solid sheet by resistance welding or adhesive bonding. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results we found that the influence of sheared position can be observed and explained clearly and this result can be utilized to get the better sheared surface.

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Influence of Die Design Variables on the Sheared Surface in Shearing Process of Sandwich Sheet Metal (샌드위치 강판의 전단가공에 있어서 전단면에 미치는 금형 설계 변수의 영향)

  • Kim J. Y.;Chung W. J.;Kim J. H.
    • Transactions of Materials Processing
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    • v.14 no.1 s.73
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    • pp.37-42
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    • 2005
  • In order to invstigate the influence of die design variables on the quality of the sheared surface in cutting of sandwich sheet metals, the cut-off operation is carried out, which is the typical shearing process in sheet metal forming technology. For experiments we made the cut-off die which can be easily adjusted for die design variables such as blankholding force, pad force and clearance. The sandwich sheet metals considered are clad304(STS304-Al1050-STS304) and anti-vibration sheet metal. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results it is shown that the shearing mechanisms are different according the material of which sandwitch sheet metal is composed. The influence of die design variable is explored and we found optimal conditions for both sandwich sheet metals. It is expected that this investigation can be utilized to get the better sheared surface.

Influence of die design variables on the sheared surface in cut-off process of sandwich sheet metal (샌드위치 강판의 전단가공에 있어서 전단면에 미치는 금형 설계 변수의 영향)

  • Kim J. Y.;Choi J. S.;Kim J. H.;Chung W. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.05a
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    • pp.57-61
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    • 2004
  • in order to improve the quality of the sheared surface in cutting of sandwich sheet metals the cut-off operation is mainly investigated which is the typical shearing process in sheet metal forming technology. For experiments the cut-off die is made which can be easily adjusted by die design variables such as blankholding force, pad force, and clearance. The sheet metals chose as specimen are clad304(STS304-Al1050-STS304) and anti-vibration sheet metal. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface before and after cut-off operation is measured and quantitatively compared with the help of the optical microscope. From test results the good sheared surface was shown when the clearance gets small with large blankholding force.

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Filler effect of inner-structure bonded sheet metal in shearing process (내부구조재를 가진 중공형 접합판재의 전단가공특성에서 틈새효과에 관한 연구)

  • Kim, Ji-yong;Jung, Wan-jin;Kima, Jong-ho
    • Design & Manufacturing
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    • v.2 no.1
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    • pp.15-19
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    • 2008
  • While recent industrial structure is various, it is small quantity batch production structure, and products requiring of various functions are increasing. In order to improve the quality of the sheared surface in cutting of inner structure bonded sheet metal the cut-off operation is mainly investigated, which is the typical shearing process in sheet metal forming technology. The sandwich sheet metals considered have inner structure which is constructed in the form of crimped expanded metal and woven metal. The inner structure is bonded between solid sheet by resistance welding or adhesive bonding. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results we found that the influence of sheared position can be observed and explained clearly and this result can be utilized to get the better sheared surface.

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Effect of V-Ring Indenter on the Sheared Surface in the Fine Blanking Process of a Pawl (폴의 파인 블랭킹 공정에서 전단면에 미치는 V형 돌기의 영향에 관한 연구)

  • Kim, Yun-Joo;Kwak, Tae-Soo;Bae, Won-Byong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.9
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    • pp.102-108
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    • 2000
  • A finite element analysis has been performed to investigate the effect of v-ring indenter on the sheared surface in the fine blanking of a pawl which is a part of the automotive safety belt and is made of S45C sheet. In the present analysis the Cockcroft and latham fracture criterion and the element kill method are used in order to simulate the blanking operation successfully. The simulation results are obtained for various positions and heights of the v-ring indenter. And the theoretical results are compared with available experimental results. It is shown that this FEM simulation result can be useful for predicting the optimal fine blanking condition of real products.

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Analysis of the effect of punch wear on shear surfaces in the piercing process (피어싱 공정에서의 펀치 마모가 전단면에 미치는 영향 분석)

  • Jeon, Yong-Jun;Kim, Dong-Earn
    • Design & Manufacturing
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    • v.16 no.3
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    • pp.28-33
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    • 2022
  • The recent increasing application rate of advanced high-strength steel(AHSS) for automotive parts makes it difficult to ensure the durability of forming tools. Significant load and friction generated during the piercing process of AHSS increase the wear rate and the damage degree to dies. These harsh process conditions also yield product failures, such as dimensional inconsistency of pierced holes and insufficient quality of hole's sheared edge. This study analyzed the effect of punch wear on the sheared surface of pierced parts and the forming load during the piercing process. Wear-shaped punches showed approximately 20% higher piercing load than normal-shaped punches, and the rollover ratio of the sheared surface also increased. It is considered that the dull edge of wear-shaped punches does not penetrate directly into the material but shears after tensioning it in a piercing direction. In addition, wear-shaped punches experienced compressive load even after completing the piercing process during the down-stroke and tensile load during the up-stroke. This load variation is related to the smaller diameter piercing holes produced by wear-shaped punches compared to normal-shaped punches. Thus, we demonstrated the predictability of the wear level of dies through a comparative analysis of the piercing load pattern.

Shape Design of Guillotined Shear Cutters for Steel Pipes (강관의 Guillotine 전단날 형상 설계)

  • Cho Haeyong;Lee Sangmin;Lee Sungkil;Kim Yongyun
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.2
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    • pp.105-112
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    • 2005
  • The guillotined cutting process for the pipe was studied in this paper. Until now guillotining mechanism can not be practically applied in the industries because of the deformation of sheared section around cutting area, the coarse sheared surface, and the burs. To find optimum shapes of blade, several types of blade were experimentally studied. The cutting force normal to the axial direction of the pipe was compared with the theoretical result based on the cutting energy. The experimental maximum cutting forces were very good agreement with the theoretical results. It also discussed that the design parameters of guillotining system such as the blade shape and the clearance between the blade and the die made effects to the deformation of the cutting cross section area. The results show that the guillotining method can be applicable to the pipe cutting system by optimizing the blade shape and the clearance between the blade and the die of the guillotined cutting system with respect to the sheared pipe material.

The Study on Microstructures and Mechanical Properties of Mild Steel Joined with Various Spot Welding Conditions (점용접 조건에 의한 연강의 미세조직 및 기계적특성에 관한 연구)

  • 강연철;김대영;김완기;김석원
    • Journal of Welding and Joining
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    • v.18 no.1
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    • pp.52-58
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    • 2000
  • Spot welding, namely a kind of electric resisting welding has been used widely in field of automobile and aircraft industries because of easiness to apply. Specimens used in this study was a mild steel of 1.2mm thickness and the electrode was a Cu-Cr alloy of 6mm diameter. The surface sheared of specimens after testing of tensile shear was observed by SEM(scanning electron microscope) after ultrasonic cleaning for 10min., and microstructures and grain size of all specimens were measured with using of O.M.(Optical microscope). By the means of measurement and observations of tensile shear load, fatigue strength and share surface, the weldability of spot welding was evaluated. When tensile shearing testing, fracture starting point in all specimens was took place at the bond between HAZ(Heat affected zone) and nugget. With increasing in number of layers, fatigue strength was decreased. With increasing in electric current, grain size in the HAZ became more fine.

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