• Title, Summary, Keyword: cold drawing

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The Microstructure and Mechanical Property of 0.19C-1.17Cr Steel with Cold Drawing (0.19C - 1.17Cr 강의 냉간인발조직과 기계적 성질)

  • Shin J. H.;Jang B. L.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.85-90
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    • 2001
  • The microstructure and mechanical property of 0.19C-1.17Cr steel were investigated with cold drawing. This commercial steel has the microstructure that is consist of ferrite and pearlite. The tensile and yield strength are increased as the reduction ratio of cold drawing is increased. It was clear that mechanical properties could be improved by combination of the heat treatments and reduction ratio. Yield strength. tensile strength, and impact value were formulated as a constitutive function of cold drawing ratio, respectively.

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Fabrication of Drawing Wire for Cold Rolling Mill using Tungsten Carbide Multi-Stage Dies (초경 다단 다이를 적용한 냉간 압조용 인발 선재 제조)

  • Park, D.H.;Hyun, K.H.;Lee, M.J.
    • Transactions of Materials Processing
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    • v.29 no.2
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    • pp.97-102
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    • 2020
  • Wire drawing is a metalworking process used to reduce the cross-section of a wire by pulling the wire through multi-stage drawing dies. The aim of this study is to fabricate a drawing wire using 2 stage drawing process. The finite element analysis of wire drawing was conducted to validate the efficiency of the designed process and the experiment was performed to validate the designed wire drawing process using 2 stage tungsten carbide die. Dry lubricant with powder was applied for producing a wire of desired diameter. Finally, a drawing wire using 2 stage die for cold rolling mill was developed.

Study of Material Properties of High Strength Microalloyed Steel for Cold Forming by Controlled Rolling and Cooling Technology (제어압연.제어냉각기술로 제조된 냉간성형용 비조질강의 소재특성)

  • Kim, N.G.;Park, S.D.;Kim, B.O.;An, J.Y.;Choi, H.J.
    • Transactions of Materials Processing
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    • v.15 no.8
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    • pp.603-608
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    • 2006
  • The main purpose of the present study has been placed on investigating the mechanical properties and microstructures of C-Si-Mn-V steels for cold forming manufactured by controlled rolling and cooling technology. The steels were manufactured in electric arc furnace (EAF) and casted to $160{\times}160mm$ billet. The billets were reheated in walking beam furnace and rolled to coil, the stocks were rolled by Controlled Rolling and Cooling Technology (CRCT), so rolled at low temperature by water spraying applied in rolling stage and acceleratly cooled before coiling. Rolled coils were cold drawed to the degree of 16%, 27% of area reduction respectively without heat treatment. Microstructual observation, tensile test, compression test and charpy impact tests were conducted. The mechanical properties of the steels were changed by area reduction of cold drawing and it is founded that there are optimum level of cold drawing to minimize compression stress for these steels. From the result of this study, it is conformed that $80kg_{f}/mm^{2},\;90kg_{f}/mm^{2}$ grade high strength microalloyed steel for cold forming are developed by accelerated cooling and optimum cold drawing.

Development of High Strength Microalloyed Steel for Cold Forming by Controlled Rolling and Cooling Technology (제어압연${\cdot}$제어냉각기술을 이용한 고강도 냉간성형용 비조질강의 개발)

  • Kim N. G.;Park S. D.;Kim B. O.;Choi H. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.321-324
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    • 2005
  • The main purpose of the present study has been placed on investigating the effects of controlled rolling and cooling on the microstructures and mechanical properties of C-Si-Mn-V steels for cold forming. The steels were manufactured in vacuum induction melting(VIM) furnace and casted to 1.1ton Ingots and the ingots were forged to $\Box150$ billet. The forged billets were reheated in walking beam furnace and rolled to coil, the stocks were rolled by Controlled Rolling and Cooling Technology (CRCT), so rolled at low temperature by water spraying applied in rolling stage and acceleratly cooled before coiling. Rolled coils were cold drawed to the degree of $27\%$ of area reduction without heat treatment. Microstructual observation, tensile test, compression test and charpy impact tests were conducted. The mechanical properties of the steels were changed by area reduction of cold drawing and it is founded that there are optimum level of cold drawing to minimize compression stress for these steels. From the result of this study, it is conformed that mechanical properties and microstructure of C-Si-Mn-V steels for cold forming were enhanced by accelerated cooling and founded optimum level of cold drawing.

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Process design of Monobloc Tube for Steering Input Shaft in cold drawing (일체형 스티어링 휠 튜브의 인발공정 설계)

  • Moon H. J.;Lee S. G.;Lee J. H.;Lee Y. S.;Lee J. W.;Kim B. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.431-434
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    • 2005
  • MTS(Monobloc Tube Shaft) has been used for the reduction in weight of shaft and increase in supply of power in the auto industry nowadays. Cold drawing process having high productivity and reduction in the cost has been regarded as the effective technology that is able to substitute for swaging process as forming MTS with constant outer diameter or hollow shaft without surface defects. The objective of this study is not only to find out the optimal process conditions understanding the effect of process parameters on carrying out cold drawing process of SIS(Steering Input Shaft) but also to control the defects resulted from inappropriate process conditions. Therefore, the proper drawing conditions are presented using FE-Analysis and experiment in the paper.

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Process Design of Monobloc Tube for Steering Input Shaft in Cold Drawing (일체형 스티어링 휠 튜브의 인발에 관한 연구)

  • Lee S. K.;Moon H. S.;Kim B. M.;Lee J. H.;Lee Y. S.
    • Transactions of Materials Processing
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    • v.14 no.9
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    • pp.779-784
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    • 2005
  • MTS(Monobloc Tube Shaft) has been used for the reduction in weight of shaft and increase in supply of power in the auto industry nowadays. Cold drawing process having high productivity and reduction in the cost has been regarded as the effective technology that is able to substitute for swaging process as forming MTS with constant outer diameter or hollow shaft without surface defects. The objective of this study is not only to (md out the optimal process conditions understanding the effect of process parameters on carrying out cold drawing process of SIS(Steering Input Shaft) but also to control the defects resulted from inappropriate process conditions. Therefore, the proper drawing conditions are presented using FE-Analysis and experiment in the paper.

Low Temperature δ-Precipitation of Inconel 718 Alloy Wire during Cold Drawing (인코넬 718합금 선재의 냉간 인발시 δ 상 저온 석출 현상 연구)

  • Park, Jae Man;Kim, Yong Hwan;Jang, Heui Un;Chung, Won Sub
    • Korean Journal of Metals and Materials
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    • v.50 no.7
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    • pp.511-516
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    • 2012
  • Low temperature ${\delta}$-precipitation phenomenon below 2-step aging ($718^{\circ}C$, $8hr+621^{\circ}C$, 8 hr) temperature of cold drawn Inconel 718 alloy wire was investigated. The investigation was carried out on wires with a cold drawn ratio of 0, 20, 50 and 70% using OM, SEM, XRD, TEM, and DSC. In microstructures of 50 and 70% drawn wire, many precipitates were found along the grain boundaries and the twin boundaries in deformation band. From the results of the XRD and TEM analysis, the precipitates were identified as plate-like ${\delta}$-phase. From the results of the DSC analysis, it was also found that a temperature of ${\delta}$-precipitation decreases with an increase of the cold drawn ratio. We concluded that cold drawing of inconel 718 wire promotes the ${\delta}$-precipitation, and under the condition of a high drawing ratio, the ${\delta}$-phase could be precipitated at a temperature below the aging temperature ($718^{\circ}C$).

Mechanical Pressure Drive with Enhanced Downward Velocity Characteristics (슬라이드의 하강속도특성을 개선한 기계프레스의 구동부)

  • 구형욱;최호준;황병복
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.110-120
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    • 1996
  • A crank-slider mechanism is driven by the rotating disk with are crank-pin guide to be applied to the deep drawing and cold forging presses. Load characteristics for different presses are summarized to see the basics of deep drawing of sheet metal and forging in terms of load-stroke relationship. Several types of conventional deep drawing presses are also shown to be compared with the ratating disk-types press. Kinematic performances by thearc guide driving mechanism are anlayzed in terms of load capaicty, stroke, and slide velocity characteristics, and they are compared with those by conventional driving , e.g. Niagara-typepress and so on. Kinematically better performances is shown by arc guide drive than those by conventional ones. The new driving mechanism is also proven to be one of the best for mass production press in terms of short cycle time. Possible applications of the arc guide press to deep drawing and cold forging work are in terms of kinematics and load capacity.

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Development and Evaluation of Dry Lubricant Recycle Technologies for Wire Drawing Process (와어어 인발용 건식 윤활제의 재생기술 개발 및 평가)

  • Kim, Sun-Ho;Jang, Gyu-Chul;Lee, Chi-Wook
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.35-40
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    • 2014
  • Wire drawing is aplastic deformation process that produces a wire with a desired diameter by pulling the end of the wire through a die. During the cold wire drawing process, the temperature between the wire and the die bearing is increased. This temperature increase causesenergy consumption increase, bad wire quality, and decreased die life. To reduce friction and avoid high temperature between the wire and the die in the cold wire drawing process, a dry lubricant with soap particles is used. It is not possible to reused the lubricant onceiron oxide is attached to the soap particlesat high pressure die. In this study, recycling technologies for wasted soap particles with processes of crushing, separation, and screening are developed. From the evaluation, the recycling efficiency was found to be 86.97%.

Effects os Cold Drawing Ratio on the Hardness of Inconel 718 Wire (Inconel 718 선재의 경도에 미치는 냉간신선가공의영향)

  • Jeong, Yong-Kwon;Jo, Chang-Yong;Jung, Byong-Ho;Kim, In-Bae
    • Korean Journal of Materials Research
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    • v.8 no.4
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    • pp.354-358
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    • 1998
  • Effect of cold drawing ratio and aging time on the hardness of lnconel 718 wire aged at 11l6K were investi¬gated by hardness measurement and scanning & transmission electron microscopy. Hardness which was 245Hv in as¬solution treated condition increased very rapidly to 450Hv as cold drawing ratio increased to 50%. The hardness in the early stage of aging was increased by the precipitation of $\gamma^{'}$ and $\gamma^{'}$ phases and after the peak hardness, the hardness was decreased by the transformation of $\gamma^{'}$ phase to $\delta$ phase. The time to reach peak hardness during aging appeared to be reduced with the increase of cold drawing ratio, and those times were 30, 10, and 5 minutes for 0, 30 and 50% cold drawn materials, respectively. For the 50% cold drawn material. $\gamma^{'}$ and $\gamma^{'}$ were precipitated by aging for 5 minutes at 1116K. The hardness in the same material was largely decreased under the initial hardness by the recrystallization.

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