• Title/Summary/Keyword: Wire

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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 the Wire EDM CAM System Considering a Variab1e Taper Wire-cut and an Unmanned Wire EDM During the Night (상하이형상 및 야간 무인가공을 고려한 와이어 EDM 전용 CAM 시스템 개발)

  • 유우식;정회민
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.3
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    • pp.206-214
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    • 2001
  • This paper describes the wire EDM (Electric Discharge Machining) CAM system considering a variable taper wire-cut and an unmanned wire EDM during the night. Wire EDM is applicable to all materials that are fairly good electrical conductors, including metals, alloys and most carbide. Thus it provides a relatively simple method for making holes of any desired cross section in materials that are too hard or brittle to be machined by most other methods. In this paper we classify variable taper wire-cut machining patterns and variable taper wire-cut geometries. Also we determine unmanned wire EDM patterns fur the productivity of wire EDM industry. Developed system consists of two modules: 1) Variable taper wire EDM module guarantees the length ratio machining function, the parametric ratio machining function and the marking function. 2) Unmanned wire EDM module guarantees the automatic wire EDM during the night. The proposed system has been tested in the fields and found to be a useful system.

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Estimation of Magnetization loss of HTS wires with Different Current Density (전류 밀도가 다른 선재들의 자화손실 특성 평가)

  • Lim, H.;Yoon, K.;Lee, H.;Cha, G.
    • Progress in Superconductivity and Cryogenics
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    • v.9 no.1
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    • pp.72-75
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    • 2007
  • Magnetization loss of HTS wire is strongly dependent on the critical current density and the aspect ration of the HTS wire. This paper presents the magnetization loss of stacked BSCCO wire and stacked YBCO wires which had different critical current densities. Width of the BSCCO wire was 4mm and widths of two YBCO wires were 4mm and 8mm. Single wire, two stacked three stacked and four stacked wires were fabricated and tested. Ratio of magnetization loss of BSCCO wire to YBCO wire was presented at single wire. For stacked wire, ratio of magnetization loss of single wire to stacked wire was presented. Test results shows that magnetization losses of stacked wires were greater than that of single wire at large high magnetic field above critical magnetic field.

Analysis of wet Wire Drawing Process and Pass Redesign to Reduce Wire Breakage (습식 신선공정 해석 및 단선율 저감을 위한 패스 재설계)

  • 이상곤;김민안;김병민
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1034-1037
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    • 2002
  • Wet wire drawing process is used to produce fine wire in the industrial field. The production of fine eire by using wet wire drawing process with appropriate dies pass schedule would be impossible without understanding of relationship between process parameters such as material properties, dies reduction, friction conditions, drawing speed etc. However, up to new, dies pass schedule of wet wire drawing process has performed by trial and error of expert. Therefore, this study investigates the relationship between process parameters quantitatively and analyzes a conventional wet wire drawing process. Using the results, the conventional pass schedule can be redesigned to reduce the wire breakage during wet wire drawing. To verily the result of this study, the wet wire drawing experiment was performed. And the results between conventional process and redesigned pass schedule were compared. As the comparison of results, the wire breakage was considerably reduced in the redesigned pass schedule more than conventional pass schedule.

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Fabrication of Ultra-fine Rhodium Wire Using Multi-pass Wire Drawing Process (다단 신선공정을 이용한 초극세 로듐 와이어 제조)

  • Lee, S.K.;Lee, S.Y.;Lee, I.K.;Hwang, S.K.
    • Transactions of Materials Processing
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    • v.28 no.5
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    • pp.275-280
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    • 2019
  • The aim of this study is to fabricate an ultra-fine pure rhodium wire using multi-pass wire drawing process. To manufacture $30{\mu}m$ ultra-fine rhodium wire from the initial $50{\mu}m$ wire, a multi-pass wire drawing process was designed based on the uniform reduction ratio theory. The elastic-plastic finite element analysis was then conducted to validate the efficacy of the designed process. The drawing load, drawing stress, and the distribution of the effective strain were evaluated using the finite element analysis. Finally, the wire drawing experiment was performed to validate the designed wire drawing process. From the results of the experiment, the diameter of the final drawn wire was found to be $29.85{\mu}m$.

Development of Push-pull Type Arc Welding Wire Feeder (아크 용접 와이어의 장거리 송급을 위한 Push-pull 방식의 와이어 송급장치 개발)

  • Yoon, Hyun-Jun;Hwang, In-Sung;Kim, Dong-Cheol;Kang, Moon-Jin;Choi, Ki-Gab
    • Journal of Welding and Joining
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    • v.31 no.3
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    • pp.39-43
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    • 2013
  • It is difficult to feed welding wire stably, when the distance between welding wire feeder and welding torch is far enough. In order to solve this problem, arranging a extension wire feeder between them could be one of useful methods. However, the welding wire could be twisted up in the extension cable between extension and terminal wire feeders in the case that RPM of extension wire feeding motor is higher than that of terminal motor. In this study, feeding problem of normal push-pull wire feeding system occurred at low welding current range less than 250A. In order to solve the problem, two new wire feeding systems of push-pull type were introduced. Welding wire feeding tests were preformed in the range of 150A to 400A with the developed push-pull feeding system. In addition, weldability test was performed at the welding current of 200A, 300A, and 400A. The welding wire twisting problem that was observed in the normal feeding system did not occur in the new push-pull wire feeding system.

Evaluation on the Efficiency of Cored Wire Feeding in Addition of Alloying Elements into Cu Melt (코어드 와이어 피딩에 의한 Cu 용탕에의 합금 첨가 시 효율 평가)

  • Kang, Bok-Hyun;Kim, Ki-Young
    • Journal of Korea Foundry Society
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    • v.33 no.6
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    • pp.248-253
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    • 2013
  • To add alloying elements into a pure copper melt, the wire-feeding efficiency of cored (alloy containing) wire was evaluated using a commercial, computational fluid-dynamics program. The model design was based on an industrial-scale production line. The variables calculated included wire feed rate, melt temperature, wire diameter, melt flow rate and wire temperature. Efficiency was evaluated after a series of calculations based on the penetration depth of the alloy-wire into the molten copper bath. Of the five variables investigated, the wire feed rate and wire diameter were the most influential factors affecting the feeding efficiency of the cored-wire.

Examples of Trolley Wire Resistance Influential on The Movement of Tensioning Devices (장력조정장치의 동작에 영향을 미치는 가선저항의 사례)

  • Yoon, Yong-Han;Yim, Geum-Kwang;Han, Yang-Gyu
    • Proceedings of the KSR Conference
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    • pp.886-892
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    • 2007
  • This paper presents examples of trolley wire resistance influential on the movement of tensioning devices. Therefore, this study is on the examples of trolley wire resistance which keep tensioning devices from working properly to the expansion and contraction in accordance with temperature change of overhead trolley wire system such as messenger wire and contact wire. Trolley wire resistance interrupts the working of tensioning device and drops the capacity of trolley wire. Reduced trolley wire capacity lowers the performance of current collection and has a bad effect on electrical train operation. So it is desirable to reduce the factors increasing trolley wire resistance to the minimum from the designing and construction stage of overhead trolley wire system. This study will introduce this problem and suggest the solution.

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Al5052 Welding by $CO_2$ Laser using Filler Wire (용접 와이어를 사용한 Al5052 $CO_2$ 레이저 용접)

  • 박기영;이경돈;김주관
    • Laser Solutions
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    • v.5 no.1
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    • pp.13-21
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    • 2002
  • Compared to conventional welding process, laser welding does not use additional filler wire generally. However, if laser welding uses the filler wire, the applicability of the method can be broaden. When laser welding uses the filler wire, it is possible to enhance gap bridging ability and to prevent cracking in weld pool by metallurgical control. In this study, we had optimal condition and experimented gap bridging capability for butt welding with 2㎜ Al5052 alloys using the filler wire feeder. As the experimental parameters, wire feed rate and wire diameter are considered and then the performance of wire feed is evaluated under various filler wire welding conditions.

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AN EXPERIMENTAL STUDY ON CHANGES OF ORTHODONTIC WIRES AFTER ELECTROPOLISHING (전해연마후 교정선의 변화에 관한 실험적 연구)

  • Lee, Jai-Chul;Kim, Jong-Chul
    • The korean journal of orthodontics
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    • v.22 no.4
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    • pp.823-836
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    • 1992
  • Guiding a tooth along an arch wire results in a counteracting frictional force among arch wires, bracket and ligature. This frictional forces should be eliminated or minimized when orthodontic teeth movement is being planned. The purpose of this study was to evaluate the changes of width, cross-sectional forms and surface morphologies of stainless steel wire and $Elgiloy^{\circledR}$ wire after electropolising. Experimental variables included in this experiment were arch wire materials, current, electrolyte temperature and polishing time. Wire widths were measured by micrometer and cross-sectional forms and surface morphologies were examined with optical microscope and scanning electron microcope. The results were as follows: 1. The mean and standard deviation of widths of stainless steel wire and $Elgiloy^{\circledR}$ wire varying polishing time with condition of $249A/dm^2$ and $20^{\circ}C,\;249A/dm^2$ and, $332A/dm^2$ and $20^{\circ}C$ and $332A/dm^2$ and $250^{\circ}C$ were obtained. 2. With increasing polishing time, the widths of stainless steel wire and $Elgiloy^{\circledR}$ wire became decreased proportionally 3. The changes of widths of stainless steel wire and $Elgiloy^{\circledR}$ wire were statistically insignificant between $20^{\circ}C$ group and $25^{\circ}C$ group, but significant between $249A/dm^2$ group and $332A/dm^2$ group. 4 The cross-sectional forms of wire after electropolishing were not changed in stainless steel wire, and while it were changed to rounded corners in $Elgiloy^{\circledR}$ wire. 5. The surface morphologies of wire after electropolishing were scratch-absent and more smoothened both in stainless steel wire and $Elgiloy^{\circledR}$ wire.

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