• Title/Summary/Keyword: Wire Temperature

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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.

The Correction of Fluid Temperature for Hot-wire Anemometer (열선 유속계에 대한 유체 온도의 보정)

  • 심상학
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.6
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    • pp.92-97
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    • 1999
  • This paper reports by simple method that is quickly corrected the effects of fluid temperature for the hot wire anemometer. We are concerned with a variable output of hot wire anemometer on arbitrary fluid temperature. Hot wire by measuring boundary layer of turbulent flow has been calibrated by arbitrary temperature lower than 10$0^{\circ}C$, and velocity lower than 20m/s. As a result, we could pick up the temperature factor affected by output of hot wire anemometer from related in output of arbitrary temperature to output of room temperature. By using temperature factor on the output of hot wire anemometer, we also obtained that the relationship of velocity was of no effect by temperature of fluids. About results of calibrated hot wire, uncertainly of velocity is 2.15% at room temperature and 3.1% at arbitrary temperature.

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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.

A Study on the Fine Wire Drawing Process Design to Improve the Productivity (생산성 향상을 위한 세선 인발공정설계에 관한 연구)

  • Lee, S.K.;Kim, B.M.;Kim, M.A.
    • Transactions of Materials Processing
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    • v.17 no.4
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    • pp.257-262
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    • 2008
  • The control of wire temperature is very important in the fine wire drawing process. The wire speed should be increased, and the wire temperature should be dropped as much as possible. Up to now, the process design of wire drawing process depends on the experiences of experts. In this study, a wire drawing process design method was proposed to increase the productivity. The proposed method of this study includes the pass schedule and the design of a multi pass wire drawing machine. A pass schedule was performed based on the calculation of the wire temperature. Also, a new multi pass wire drawing machine was manufactured to apply the designed pass schedule. Through the wire drawing experiment, the effectiveness of the proposed process design method was evaluated. The final drawing speed was increased from 1,100m/min to 2,000m/min without deterioration of final drawn wire.

Development of Isothermal Pass Schedule Program for the Re-design of a Continuous High Carbon Steel Wire Drawing Process (고탄소강 연속 신선 공정의 재설계를 위한 등온패스스케줄 프로그램의 개발)

  • Kim, Young-Sik;Kim, Dong-Hwan;Kim, Byung-Min;Kim, Min-An;Park, Yong-Min
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.5
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    • pp.57-64
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    • 2001
  • The high speed in the wire-drawing process to meet the demands for the increased productivity has a great effect on the heat generated due to plastic deformation and friction between the wire and the drawing dies. During the high carbon steel wire drawing process, the temperature rise gives a great influence to the fracture of wire. In this paper, to control the temperature rise in the wire after the deformation through the drawing die, the calculation method of the wire temperature, which includes the temperature rise in the deformation zone as well as the temperature drop in the block considering the heat transfer among the wire, cooling water and surrounding air, is proposed. These calculated results of the wire temperature at the inlet and exit of the drawing die at each pass are compared with the measured wire temperatures and verified its efficiency. So, using the program to predict the wire temperature, the isothermal pass schedule program was developed. By applying this isothermal pass schedule program to the conventional process condition, a new isothermal pass schedule is redesigned through all passes. As a result, the possibility of wire fracture could be considerably reduced and the productivity of final product could be more increased than before.

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Bead Formation and Wire Temperature Distribution during Ultra-high-speed GTA Welding Using Pulse-heated Hot-wire

  • Shinozaki, K.;Yamamoto, M.;Mitsuhata, Koichi;Nagashima, Toshiharu;Kanazawa, T.;Arashin, H.
    • Proceedings of the KWS Conference
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    • 2009.11a
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    • pp.226-234
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    • 2009
  • The purpose of this study was to investigate the melting phenomenon of filler wire in detail and to obtain the precise temperature distribution of filler wire during GTA welding under the ultra-high welding speed condition in order to develop the ultra-high-speed GTA welding process with the pulse-heated hot-wire system by using three kinds of materials. The melting phenomenon of filler wire was observed using a high-speed camera and the temperature distribution of filler wire was measured using a radiation thermometer. From the above result, the adequate welding conditions of each material to make the GTA welding process with the ultra-high welding speed could be obtained. The ultra-high-speed GTA welding process needed the adequate wire current in order to obtain the adequate temperature distribution and the adequate melting position of filler wire. Moreover, the temperature distributions of three kinds of filler wire could be estimated by using the proposed simple estimation method.

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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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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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Effect of Temperature Variations on Heat Transfer Coefficient in Crossflow over a Circular Cylinder (온도변화가 실린더 주위 열전달계수에 미치는 영향에 관한 실험적 연구)

  • Kauh, S.K.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.4 no.2
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    • pp.137-145
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    • 1992
  • coefficient precisely, experiments were carried out in three categories which contain the regime of (1) constant wire temperature (2) constant fluid temperature (3) constant temperature difference between wire and fluid. Measurements were made with electrically heated circular tungsten wire placed normal to air stream at the exit of jet. Heat transfer coefficient was increased with wire temperature increasing and decreased by fluid temperaure increasing and was not changed with varying both temperature if their difference were kept constant.

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Pass Schedule Design for Improvement of Drawing Speed in the Dry Wire Drawing Process (신선 속도 향상을 위한 건식 신선 공정의 패스스케줄 설계)

  • 김영식;김동환;김병민;김민안;박용민
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.600-603
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    • 2000
  • In the high carbon steel wire drawing process, the wire temperature increases as the drawing speed is faster in order to increase the production rate in the shop floor. The rapid temperature rise causes the wire fracture in the dry wire drawing process. So, in this paper, the isothermal pass schedule program, which includes the calculation method of wire temperature at each pass, is proposed to prevent the wire fracture due to the temperature rise. Using the isothermal pass schedule program, it is newly proposed the pass schedule design system that prevents the cup-cone defects, improves the elongation of the final products and assures further deformation. As a result, the temperature rise of the wire was decreased and the production rate of the final product is remarkably grown up according to the increase of the final drawing speed than that of the conventional process. Also, the proposed pass schedule design system could give a useful information to the process designer who would design the high carbon steel wire drawing process.

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