• Title, Summary, Keyword: 스피닝

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Hydrogen Permeation Properties of Ni-based Amorphous Alloys Membrane (Ni-based 비정질 합금막의 수소투과 특성)

  • Seok, Song;Lee, Dock-Young;Kim, Yoon-Bae
    • Transactions of the Korean hydrogen and new energy society
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    • v.19 no.1
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    • pp.35-40
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    • 2008
  • Ni-based amorphous alloy ribbon was prepared by a single-roller melt-spinning technique. Palladium coating was found to enhance significantly the absorption/desorption behavior of hydrogen in amorphous alloy. The hydrogen permeability of a Pd-coated $(Ni_{60}Nb_{40}){_{100-X}}$TaX(x=5, 10) amorphous alloy was examined in the temperature range of $623{\sim}773K$, comparable with those of $Pd_{60}-Cu_{40}$ alloys. The permeated hydrogen flux was increased with increasing the temperature and the difference of hydrogen pressure between the feed side and permeates side of the membrane. The Ni-based amorphous alloys were characterized by X-ray diffractometry(XRD) and differential scanning calorimetry(DSC). The morphology of surface and roughness was observed by using scanning electron microscopy(SEM) and atomic force microscopy(AFM).

Hydrogen Embrittlement and Surface Properties of Pd-coated Zr-based Amorphous Alloys (Pd 코팅된 Zr기 비정질 합금의 수소취성 및 표면특성)

  • Seok, Song;Lee, Dock-Young;Kim, Ki-Bae
    • Transactions of the Korean hydrogen and new energy society
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    • v.18 no.2
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    • pp.182-188
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    • 2007
  • [ $Zr_{50}-Ni_{27}-Nb_{18}-Co_5$ ] amorphous alloys ribbon was prepared by a single-roller melt-spinning technique. In order to improve the hydrogen kinetics Pd-coating were carried out on each side of the amorphous ribbon. Pd prevents oxidation of Zr and catalyses the dissociation of molecular hydrogen to atomic hydrogen. In this work, the hydrogen embrittlement and surface properties on Zr-based amorphous alloys were investigated. The Zr-based amorphous alloys were characterized by X-ray diffractometry(XRD) and differential scanning calorimetry(DSC). The morphology of surface and roughness was observed by using scanning electron microscopy(SEM) and atomic force microscopy (AFM). A lattice parameter of both Pd and Zr-based amorphous alloy was increased after hydrogen permeation at 473 K. After hydrogen permeation at 473 K, some cracks were observed on the surface of Pd, which was the cause for the hydrogen embrittlement. The crystallization temperature of Zr-based amorphous alloy was decreased due to the permeated hydrogen.

Fabricatin and Hydrogen Storage Property of Mg-33.5%Ni Alloy Powder Prepared by Melt-Spining Process (Melt-spining 공법에 의한 Mg-33.5%Ni 수소 저장 합금 제조 및 수소저장 특성)

  • Hong, Seong-Hyeon;Yim, Chang-Dong;Bae, Jong-Soo;Na, Young-Sang
    • Transactions of the Korean hydrogen and new energy society
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    • v.18 no.4
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    • pp.399-405
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    • 2007
  • The hyper-eutectic Mg-33.5%Ni alloy was rapidly solidified by melt spinning process. The melt-spun Mg-33.5%Ni has amorphous structure and crystallization occurred above $162^{\circ}C$. The hydriding and dehydriding rates of melt-spun Mg-33.5%Ni increased with cycle and high rate of hydrogen storage occurred at 3rd cycle. The maximum hydrogen amount absorbed in melt-spun Mg-33.5%Ni at $300^{\circ}C$ is about 4.5%.

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.

Caulking and Gap Analysis for a Ball Joint (볼 조인트의 코킹 및 유격해석)

  • Hwang, Seok-Cheol;Kim, Jong-Kyu;Seo, Sun-Min;Han, Seung-Ho;Lee, Kwon-Hee
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.9
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    • pp.1077-1082
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    • 2011
  • Ball joint is a rotating and swiveling element that is typically the interface between two parts. In an automobile, the ball joint is the component that connects the control arms to the steering knuckles by playing a role of bearing. The ball joint can also be installed in linkage systems for motion control applications. This paper describes the simulation strategy for a ball joint analysis, considering manufacturing process. Its manufacturing process can be divided into plugging and spinning. Then, the interested response is selected as the stress distribution generated between its ball and bearing. In this paper, a commercial code of NX DAFUL 2.0 using an implicit integration method is introduced to calculate the response. In addition, the gap analysis is performed to investigate the fitness. Also, the optimum design is suggested through case studies.

Simulation and Experimental Investigation of Reverse Drawing Process for Manufacture of High-Capacity Aluminum Liner (대용량 알루미늄 라이너의 성형을 위한 역 드로잉 공정 해석 및 실험)

  • Lee, Seungyun;Cho, Sungmin;Lee, Sunkyu;Lyu, Geunjun;Kim, Soyoung;Kang, Sunghun
    • Journal of the Korean Institute of Gas
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    • v.20 no.4
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    • pp.78-84
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    • 2016
  • In this work, finite element investigations were carried out to optimize reverse drawing process design for manufacture of high-capacity aluminum liner used in fuel cell vehicle. The tensile tests with aluminum alloy Al6061 annealed at $350^{\circ}C$ were carried out to obtain the flow stresses. In order to estimate more accurate flow stresses after necking, the flow stresses were estimated from the comparison of load vs. displacement curves which were obtained from experimental and simulation results of tensile tests. In case of finite element analyses of reverse drawing processes, it was focused on the effects of process designs such as punch and die designs, blank holding force, drawing ratio and the clearance between the punch and blank holder on the generation of wrinkle and fracture of the blank and partially heated punch. However, it was revealed that experimental results still show the fracture at the end of 2nd drawn cup, although partially heated punch is used. Nevertheless, the drawn cup can be used because the sufficient length of the drawn cup for the next flow forming process and spinning process was obtained.

A Design Of Cross-Shpaed CMOS Hall Plate And Offset, 1/f Noise Cancelation Technique Based Hall Sensor Signal Process System (십자형 CMOS 홀 플레이트 및 오프셋, 1/f 잡음 제거 기술 기반 자기센서 신호처리시스템 설계)

  • Hur, Yong-Ki;Jung, Won-Jae;Lee, Ji-Hun;Nam, Kyu-Hyun;Yoo, Dong-Gyun;Yoon, Sang-Gu;Min, Chang-Gi;Park, Jun-Seok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.5
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    • pp.152-159
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    • 2016
  • This paper describes an offset and 1/f noise cancellation technique based hall sensor signal processor. The hall sensor outputs a hall voltage from the input magnetic field, which direction is orthogonal to hall plate. The two major elements to complete the hall sensor operation are: the one is a hall sensor to generate hall voltage from input magentic field, and the other one is a hall signal process system to cancel the offset and 1/f noise of hall signal. The proposed hall sensor splits the hall signal and unwanted signals(i.e. offset and 1/f noise) using a spinning current biasing technique and chopper stabilizer. The hall signal converted to 100 kHz and unwanted signals stay around DC frequency pass through chopper stabilizer. The unwanted signals are bloked by highpass filter which, 60 kHz cut off freqyency. Therefore only pure hall signal is enter the ADC(analog to dogital converter) for digitalize. The hall signal and unwanted signal at the output of an amplifer and highpass filter, which increase the power level of hall signal and cancel the unwanted signals are -53.9 dBm @ 100 kHz and -101.3 dBm @ 10 kHz. The ADC output of hall sensor signal process system has -5.0 dBm hall signal at 100 kHz frequency and -55.0 dBm unwanted signals at 10 kHz frequency.