• Title/Summary/Keyword: Forming Depth

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The Effects of Forming Depth and Feed Rate on Forming Force of Flow Forming (유동성형의 성형력에 미치는 가공깊이와 이송속도의 영향)

  • Nam K. O.;Yeom S. H.;Kang S. J.;Hong S. I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.10a
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    • pp.251-254
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    • 2005
  • The flow forming has been used to produce long thin walled tube parts, with reduced forming load and enhanced mechanical and surface quality for a good finished part compared with other method formed parts. So flow forming technique is used widely in industrial production. Especially spinning and flow farming techniques an used frequently in automotive, aerial, defense industry. In this paper, FEM analysis of three-roller backward flow forming of a workpiece is carried out to study effects of forming depth and feed rate on forming force. The axial and radial forces on several forming depth and feed rate conditions are obtained. The phenomena such as bell mouth, build up and bulging during simulation are observed as well.

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The Effects of Forming Depth and Feed Rate on Forming Force of Backward Flow Forming (후방유동성형에서 가공깊이와 이송속도가 성형력에 미치는 영향)

  • Nam Kyoung-O;Yeom Sung-Ho;Kwon Hyuk-Sun;Hong Sung-In
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.4
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    • pp.16-22
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    • 2005
  • The flow forming has been used to produce long thin walled tube parts, with reduced forming force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. So flow forming technique is used widely in industrial production. Especially spinning and flow forming techniques are used frequently in automotive, aerial, defense industry. In this paper, finite element method analysis of three-roller backward flow forming of a workpiece is carried out to study effects of forming depth and feed rate on forming force. The axial and radial forces on several forming depth and feed rate conditions are obtained.

Studies on the forming limits for optimization of the tool path in Dieless incremental sheet metal forming (무금형 점진 판재 성형에서 공구경로 최적화를 위한 성형한계에 관한 연구)

  • Lee S. J.;Kim M. C.;Lee Y. S.;Kwon Y. N.;Lee J. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.05a
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    • pp.249-252
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    • 2005
  • Recently, as the industrial demand for small quantity batch production of sheet metal components, the application of dieless forming technology to production of these component rise with the advantages of the reduction in manufacturing cost and time. In dieless forming processes, the determination of moving path of tool plays an important role in producing successfully formed parts. In order to obtain the optimized moving path of tool avoiding forming failure, it is necessary to examine the forming limit of sheet material. Therefore, in this study, as the new criterion to evaluate the formability of sheet material in dieless forming processes FDD(feeding depth diagram) with respect to feeding depth and punch diameter is proposed. Thus, the FDD for the sheet materials of STS304 and Ti-grade2 were obtained from a series of FDT(feeding depth test). In addition the possibility of the application of FLD in judging forming severity in dieless forming processes was investigated by comparing the results of FE analyses based on FLD and experimental FDT.

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Effects of Forming Depth on the Deformation Behavior of Cup-like Tubes in Tube Spinning Process (튜브 스피닝 공정에서 성형깊이가 컵형 튜브의 변형거동에 미치는 영향)

  • Shin, Y.C.;Yoon, D.J.;Lim, S.J.;Choi, H.J.
    • Transactions of Materials Processing
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    • v.21 no.6
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    • pp.360-365
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    • 2012
  • The aim of this study was to investigate the effects of forming depth on the deformation behavior of cup-like tubes made of AISI1020 steel in tube spinning process. Spinning process was performed on cup-like tubes, which had an inner diameter of 34mm and thicknesses of 7, 8.5 or 11.5mm. The forming depths achieved were 3, 4, and 5.5mm. The complex deformation behaviors occurring during the tube spinning process was explained using the experimental results. Also analyzed were the causes of the material buildup and the bulge defect of inner surface, observed on cross section of tubes. The relationship between tube spinning conditions and the height of bulge defect was examined. The results indicate that bulge defect is increased with a decrease of the forming depth. Moreover, a critical forming depth exists for preventing the generation of the bulge defect in the tube spinning process. The present results will be useful for future decisions of forming depths for successful tube spinning of cup-like tubes.

The Effects of Forming Depth and Lead Angle on Forming Force of Shear Spinning (전단스피닝에서 가공깊이와 리드각이 성형력에 미치는 영향)

  • Yeom, Sung-Ho;Nam, Kyoung-O;Park, Hyun-Jin;Hong, Sung-In
    • Journal of the Korean Society of Propulsion Engineers
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    • v.11 no.1
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    • pp.27-33
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    • 2007
  • The shear spinning has been used to produce thin angled cone of parts, with reduced forming force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. So shear spinning technique is used widely in industrial production. Especially shear spinning and flow forming techniques are used frequently in automotive, aerial, defense industry. In this paper, finite element method analysis of shear spinning for a cone shape workpiece is carried out to study effects of forming depth and lead angle on forming force. The axial and radial forces on several forming depth and lead angle conditions are obtained.

Comparison of Forming force on forward and Backward Flow Forming for Combustion Chamber (연소기를 위한 전후방 유동성형에서의 성형력 비교)

  • Nam, Kyoun-Go;Cho, Cheon-Hwey;Hong, Sung-In
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.4
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    • pp.34-39
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    • 2006
  • The flow forming has been used to produce long thin walled tube parts, with reduced forming force and enhanced mechanical for a good finished part, compared with other method formed parts. Especially, the flow forming is suitable for making high precision thin walled cylinders, such as rocket motor cases, combustion chamber, hydraulic cylinders and high-pressure vessels and so on. In this paper, finite element analysis of three-roller forward and backward flow forming for combustion chamber is carried out to study effects of forming depth and feed rate on forming force. The axial and radial forming forces of forward flow forming on several forming depth and feed rate conditions are compared with those of backward flow forming.

Studies on the Forming Process for the Bipolar Plate of Fuel Cells

  • Jin, Chul-Kyu;Lee, Jun-Kyoung
    • Journal of the Korean Society of Industry Convergence
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    • v.21 no.4
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    • pp.175-181
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    • 2018
  • Stamping process and rubber pad forming process were performed to manufacture the bipolar plate for fuel cells. For that, a vacuum die casting process and a semi-solid forming process wherein liquid-state materials were used were adopted. After preparing the blank with the stainless steel thin plate having a thickness of 0.1 mm, the bipolar plate channel was formed with the stamping process and rubber pad forming process. The depth of the bipolar plate channel prepared by the stamping method was 0.45 mm and the depth of the bipolar plate channel prepared by the rubber pad forming process was 0.41 mm. Meanwhile, with the vacuum die casting and semi solid forming, the bipolar plate having a channel depth of 0.3 mm, same as the size of the die, could be formed.

Experimental Study on the Development of a Forming Process for Manufacturing Doubly-curved Sheet Metal (이중 곡률을 갖는 판재의 성형 공정의 개발에 대한 실험적 연구)

  • 양동열
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.03b
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    • pp.18-21
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    • 1999
  • In this study in order to make doubly-curved sheet metal effectively a sheet metal forming process has been developed by adopting the flexibility of the incremental forming process and the principle of bending deformation which causes slight deformation to thickness The developed process is an unconstrained forming process with no holder. For this study the experimental equipment is set up with the punch-set which consists of two pairs of lower support-punches and one upper center-punch. In the experiments using aluminum sheet it is found that the curvature of the formed sheet metal is determined by controlling the distance between supporting punches in pairs and the forming depth of the center-punch. and the edge-forming method is proposed for forming the sheet metal into the balanced shape. The equation using process variables such as the distance between supporting punches in pairs and the forming depth of the center-punch is proposed for the prediction of the radii of curvatures of the formed shape and it is corrected by the experimental results and the FEM simulation results about whether springback takes place. It is found that according o the simulation there is a certain set of the distance between a pair of supporting punches and the forming depth of the center-punch which causes a little springback. It is thus shown that the radii of curvatures of the formed sheet metal can be predicated by the corrected equation unless significant springback occurs.

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Comparison of Warm Deep Drawability of Stainless Steel Sheet Between Crank Press and Hydraulic Press (크랭크 프레스와 유압 프레스에서 스테인리스 강판의 온간 드로잉성 비교)

  • Kim, Jong-Ho;Choi, Chi-Soo;Na, Kyoung-Hoan
    • Transactions of Materials Processing
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    • v.4 no.4
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    • pp.345-352
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    • 1995
  • Warm deep drawing for optimum forming conditions to give the maximum drawing depth is investigated and compared with the results from experiments performed at room temperature. Experiments which draw square cups of STS 304 stainless steel sheet under the constant lubrication condition of teflon film are made both in a crank and hydraulic press for two kinds of specimens. The maximum drawing depth at warm forming condition reaches 1.4 times the drawing depth at room temperature in a crank press, whereas 1.6 times in a hydraulic press, and also more uniform distribution of thickness in case of warm deep drawn cup is observed. The effects of other factors on formability, such as forming temperature, speed of press and cooling of punch are examined and discussed.

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Comparison of Forming Force on Forward and Backward Flow Forming for Combustion Chamber (연소기 제작을 위한 전후방 유동성형에서의 성형력 비교)

  • Nam Kyoung-O;Yeom Sung-Ho;Hong Sung-In
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.05a
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    • pp.379-382
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    • 2006
  • The flow forming has been used to produce long thin walled tube parts, with reduced forming force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. Especially, the flow forming is suitable for making high precision thin walled cylinders, such as rocket motor cases, combustion chamber, hydraulic cylinders and high-pressure vessels and so on. In this paper, finite element analysis of three-roller forward and backward flow forming for combustion chamber is carried out to study efforts of forming depth and feed rate on forming force. The axial and radial forming forces of forward flow forming on several forming depth and feed rate conditions are compared with those of backward flow forming.

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