• Title/Summary/Keyword: Multi-pass Wire Drawing

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Pass Design of Drawing Process to Prevent Delamination (층간분리 방지를 위한 인발공정 패스설계)

  • Lee, S.K.;Ko, D.C.;Kim, B.M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.46-49
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    • 2008
  • Drawing process of the high carbon steel wire with high speed is usually performed at room temperature using multi pass. Tn the multi pass drawing, temperature rise affects the mechanical properties of the final product. The excessive temperature rise during the deformation promotes the occurrence of delamination, and deteriorates the torsion property and durability of wire. This paper investigates the occurrence of delamination in the wire through the torsion test and the evaluation of wire temperature. The excessive wire temperature ieads to the occurrence of delamination. Based on the calculation of the wire temperature, a new pass schedule, that can prevent the delamination due to the excessive wire temperature rise, is designed through the isothermal pass schedule.

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Isothermal Pass Schedule to Prevent Delamination in the Dry Wire Drawing Process (층간분리 방지를 위한 건식 등온 신선 패스 설계)

  • Ko, Dae-Cheol;Lee, Sang-Kon;Kim, Min-An;Kim, Byung-Min
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.1 s.190
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    • pp.57-63
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    • 2007
  • Wire drawing process of the high carbon steel with a high speed is usually conducted at room temperature using a number of passes or reductions through consequently located dies. In the multi-pass drawing process, temperature rise in each pass affects the mechanical properties of the final product such as bending, torsion, and tensile property, etc. This temperature rise during the deformation promotes the occurrence of delamination, and deteriorates the torsion property and durability of wire. This study investigates the occurrence of delamination in the wire through the torsion test and the evaluation of wire temperature. The excessive wire temperature leads to the occurrence of the delamination. Based on the calculation of the wire temperature, a new pass schedule, which can prevent the delamination due to the excessive wire temperature rise, is designed through the isothermal pass schedule.

Prediction of the wire temperature in a high carbon steel drawing process (고탄소강의 다단 인발 공정에서의 선재의 온도 예측)

  • Kim, Young-Sik;Kim, Yong-Chul;Kim, Byung-Min
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.821-825
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    • 2000
  • Drawing is one of the oldest metal forming operations and has major industrial significance. This process allows excellent surface finishes and closely controlled dimensions to be obtained in long products that have constant cross sections. In drawing of the high carbon steel wire, exit speeds of several hundreds meters per minute are very common. Drawing is usually conducted at room temperature using a number of passes or reductions through consequently located dies. In multi-stage drawing process like this, temperature rise in each pass affects the mechanical properties of final product such as bend, twist and tensile strength. In this paper, therefore, to estimate the wire temperature in multi-stage wire drawing process, wire temperature prediction method was mathematically proposed. Using this method, temperature rise at deformation zone as well as temperature drop between die exit and the next die inlet were calculated.

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Prediction of Surface Residual Stress of Multi-pass Drawn Steel Wire Using Numerical Analysis (수치해석을 이용한 탄소강 다단 신선 와이어 표면 잔류응력 예측)

  • Lee, S.B.;Lee, I.K.;Jeong, M.S.;Kim, B.M.;Lee, S.K.
    • Transactions of Materials Processing
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    • v.26 no.3
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    • pp.162-167
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    • 2017
  • The tensile surface residual stress in the multi-pass drawn wire deteriorates the mechanical properties of the wire. Therefore, the evaluation of the residual stress is very important. Especially, the axial residual stress on the wire surface is the highest. Therefore, the objective of this study was to propose an axial surface residual stress prediction model of the multi-pass drawn steel wire. In order to achieve this objective, an elastoplastic finite element (FE) analysis was carried out to investigate the effect of semi-die angle and reduction ratio of the axial surface residual stress. By using the results of the FE analysis, a surface residual stress prediction model was proposed. In order to verify the effectiveness of the prediction model, the predicted residual stress was compared to that of a wire drawing experiment.

Prediction Model of Surface Residual Stress for Multi-Pass Drawn High Carbon Steel Wire (고탄소강 다단 신선 와이어의 표면 잔류응력 예측모델)

  • Kim, D.W.;Lee, S.K.;Kim, B.M.;Jung, J.Y.;Ban, D.Y.;Lee, S.B.
    • Transactions of Materials Processing
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    • v.19 no.4
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    • pp.224-229
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    • 2010
  • During the multi-pass wire drawing process, wires suffer a great amount of plastic deformation that is through the cross-section. This generates tensile residual stress at surface of drawn wires. The generated residual stress on surface is one of the problems for quality of wires so that prediction and reduction of residual stresses is important to avoid unexpected fracture. Therefore, in this study, the effect of process variables such as semi-die angle, bearing length and reduction ratio on the residual stress was evaluated through Finite Element Analysis. Based on the results of the Analysis, a prediction model was established for predicting residual stress on the surface of high carbon steel(AISI1072, AISI1082). To identify the effectiveness of the proposed model, X-ray diffraction is used to measure the residual stresses on the surface. As the result of the comparison between calculated residual stresses and measured residual stresses, the model could be used to predict residual stresses in cold drawn wire.

Development of Wire Temperature Prediction Method in a Continuous Dry Wire Drawing Process Using the High Carbon Steel (고탄소강의 연속 건식 신선 공정에서 선재의 온도 예측 기법 개발)

  • Kim, Yeong-Sik;Kim, Dong-Hwan;Kim, Byeong-Min;Kim, Min-An;Park, Yong-Min
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.2
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    • pp.330-337
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    • 2001
  • Wire drawing process of the high carbon steel with a high speed is usually conducted at room temperature using a number of passes or reductions through consequently located dies. In multi-stage drawing process, temperature rise in each pass affects the mechanical properties of final product such as bend, twist and tensile strength. Also, this temperature rise during the deformation is the reason that the wire in drawing process is broken by the embrittlement due to rapid strain aging effect. This paper presents the estimation of the wire temperature for the multi-stage wire drawing process. Using the proposed calculation method of wire temperature, temperature rise at deformation zone as well as temperature drop in block considering the heat transfer between the block and wire were calculated. As these calculated wire temperatures were applied to the real industrial fields, it was known that the calculated results were in a good agreement with the measured wire temperature.

Influence of Process Parameters on Residual Stress and Reducing Residual Stress in Drawn Wire (인발 선재의 잔류응력에 미치는 공정변수의 영향 및 잔류응력 완화)

  • Lee S. K.;Hwang W. H.;Kim B. M.;Bae C. M.
    • Transactions of Materials Processing
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    • v.14 no.8 s.80
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    • pp.704-711
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    • 2005
  • The influence of process parameters in drawn wire on residual stresses was investigated. Based on a FE-simulation of the wire drawing process, the effects of process parameters such as semi-die angle, reduction, friction coefficient and bearing length on the residual stresses were investigated. The validity of the FE-simulation results was verified by the comparison of the previous simulated results with experimental data. In this study, semi-die angle and die reduction have significant effect on the residual stresses at the surface of drawn wire. Several methods such as, addition of axial tension, application of skin pass, straightening in multi-roll straightener etc, were suggested in the previous studies to reduce the residual stresses. In this study, the results show that the concurrent application of skin pass with low die reduction and low semi-die angle at the final stage of drawing operation reduces dramatically the both axial and hoop residual stresses after drawing

A Study on the Influence of Process Parameters on Residual Stress and Reducing Residual Stress for Drawn Wire Using FE-Analysis (유한요소 해석에 의한 공정변수가 인발 선재의 잔류응력에 미치는 영향평가 및 완화에 관한 연구)

  • Lee S.G.;Hwang W.H.;Kim B.M.;Bae C.M.;Lee C.Y.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.834-837
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    • 2005
  • This study presents a study on the influence of process parameters(semi-die angle, die reduction, friction condition, and bearing length) in drawn wire on residual stresses were investigated using FE-analysis. In this study, semi-die angle and die reduction have a significant effect on the residual stresses at the surface of drawn wire. In the previous study, in order to reduce the residual stresses, several methods were suggested: addition of axial tension, application of skin pass, straightening in multi-roll straightener etc. In this study, it can be known that the concurrent application of skin pass with low die reduction and low semi-die angle at the final stage of drawing operation reduces dramatically the both axial and hoop residual stresses after drawing.

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Evaluation of Axial Residual Stress in Multi-Pass Drawn High Carbon Steel Wire Considering Effective Stress-Strain Curve at High Strain (고변형률 영역의 유효응력-변형률 곡선을 고려한 고탄소강 다단 신선 와이어 축방향 잔류응력 평가)

  • Lee, Sang-Kon;Kim, Dae-Woon;Kim, Byung-Min;Jung, Jin-Young;Ban, Duk-Young;Lee, Seon-Bong
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.8
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    • pp.70-75
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    • 2010
  • The aim of this study is to evaluate the axial residual stress in multi-pass drawn high carbon steel wire by using FE analysis and XRD. When FE analysis is applied to evaluate the residual stress in drawn wire of multi-pass drawing process, obtaining the reliable effective stress-strain curve at high strain is very important. In this study, a model, which can express the reliable effective stress-strain curve at high strain, is introduced based on the Bridgman correction and tensile test for multi-pass drawn high carbon steel wires. By using the introduced model, FE analysis was carried out to evaluate the axial residual stress in the drawn wires. Finally, the effectiveness of the FE analysis with the introduced stress-strain relation was verified by the measurement of residual stress in the drawn wires through XRD. As a result, the evaluated residual stress of FE analysis shows good agreement with the measured residual stress.