• Title/Summary/Keyword: Continuous chip

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Chip Breaking Prediction Using AE Signal (AE신호에 의한 칩 절단성 예측)

  • 최원식
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.4
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    • pp.61-67
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    • 1999
  • In turning the chip may be produced in the form of continuous chip or discontinuous one. Continuous chips produced at high speed machining may hit the newly cut workpiece surface and adversely affect the appearance of the surface finish and may interfere with tool and sometimes induce tool fracture. In this study relationship between AE signal and chip form was experimentally investigated, The experimental results show that types of chip form are possible to be classified from the AE signal using fuzzy logic.

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Chip Form Prediction using Fuzzy Logic in Turning (절삭가공에서 퍼지알고리즘을 이용한 칩형상 예측)

  • Choi, Won-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.4 no.2
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    • pp.127-132
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    • 2001
  • In turning, the chip may be produced in the form of continuous chip or discontinuous chip. The continuous chips are dangerous to the operator and difficult to be handled at high speed machining. The signal of AE(Acoustic Emission) is found out to be related to cutting conditions, tool materials, test conditions and tool geometry in turning. In this study, the relationship between AE signal and chip form was experimentally investigated. The experimental results show that the types of chip form are possible to be classified from the AE signal using fuzzy logic.

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Chip Shape Control using AE Signal in Pure Copper Turning (순동선삭가공에서 AE 신호를 이용한 칩 형상 제어)

  • Oh, Jeong Kyu;Kim, Pyeong Ho;Koo, Joon Young;Kim, Duck Whan;Kim, Jeong Suk
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.23 no.4
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    • pp.330-336
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    • 2014
  • The continuous chip generated in cutting process deteriorates workpiece, tool, and machine tool system. It is necessary to treat this continuous chip in ductile material machining condition for stable cutting. This paper deals with the chip control method using acoustic emission(AE) signal in pure copper turning operation. AE raw signals, root mean square(RMS) signals and wavelet transformed signals measured in turning process are introduced to analysis for chip patterns. With analysis of AE signals, it is obtained that the produced chip patterns are correlated with the specified AE signals which are transformed by fuzzy pattern algorithm. By this experimental investigation, the chip patterns can be classified at significant level in pure copper machining process and controlled from continuous chips to reduced-length stable chips.

Characteristics of Indium-Tin-Oxide Electrode for Continuous-flow PCR Chip (연속흐름 중합효소연쇄반응칩 제작을 위한 인듐 산화막 전극의 특성분석)

  • Joung, Seung-Ryong;Kim, Jun-Hyeok;Yi, In-Je;Kang, C.J.;Kim, Yong-Sang
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.3
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    • pp.561-565
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    • 2007
  • We propose glass and PDMS (polydimethylsiloxane) chips for DNA amplification with continuous-flow PCR (polymerase chain reaction). The PDMS microchannel was fabricated using a negative molding method for sample injection. Three heaters and sensors of ITO (indium-tin-oxide) thin films were fabricated on glass chip. ITO heaters and sensors were calibrated accurately for the temperature control of the liquid flow. ITO heater generated stable heat versus applied power. ITO sensor resistance was changed linearly versus temperature increase as a RTD (resistance temperature detector) sensor. As a result, we enable precision temperature control of continuous-flow PCR chip. Using the continuous-flow PCR chip DNA plasmid pKS-GFP 720 bp was successfully amplified.

A Continuous Cell Separation Chip Using Hydrodynamic Dielectrophoresis Process (유체동역학적 유전영동법을 이용한 극소형 연속 세포분리기)

  • Doh Il;Cho Young-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.1 s.232
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    • pp.53-58
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    • 2005
  • We present a high-throughput continuous cell separation chip using hydrodynamic dielectrophoresis (DEP) process. The continuous cell separation chip uses three planar electrodes in a separation channel, where the positive DEP cells are moved away from the central streamline while the negative DEP cells remain in the central streamline. In the experimental study, we use the mixture of viable (live) and nonviable (dead) yeast cells in order to obtain the continuous cell separation conditions. For the conditions of the electric fields frequency of 5MHz and the medium conductivity of $5{\mu}S/cm$, the fabricated chip performs a continuous separation of the yeast cell mixture at the varying flow-rate in the range of $0.1{\sim}{\mu{\ell}/min$.; thereby, resulting in the purity ranges of $95.9{\sim}97.3\%\;and\;64.5{\sim}74.3\%$ respectively for the viable and nonviable yeast cells. present chip demonstrates the constant cell separation performance for varying mixture flow-rates.

The Prediction and Classification of the Chip Fomation using Cutting Force (절삭력에 의한 칩의 형상분류와 칩형상 예측)

  • 최원식
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.2
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    • pp.40-46
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    • 1998
  • In order to achieve high flexibility in manufacture, chip control is one of the most serious problems at present. The continuous type chip (uncontrolled chip), which interrupts the normal cutting process and damages the operator, tool and workpiece have a higher force ratio. while the controlled chip which is 6 or 9 type and C type, has the values of the force ratio below 0.6 The chips were classified by 4 types. in chip formation and by described chip history during the cutting process. Finally, the feasibility of utilizing force ratios in chip control will be pointed out while comparing generated force signals during the cutting process.

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Control of Chip Form by Feedrate Adjustment (선삭에서 이송량조정에 의한 칩이 형태 제어)

  • 전재억;하만경;백인환
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.3
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    • pp.75-82
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    • 2001
  • The continuous chip in turning operation deteriorates the precision of workpiece and can cause a hazardous condition to operator. Thus the chip form becomes a very important task for reliable turning process. The chip form is identified using the neural network of supervise data Through the measurement of energy radiated from the chip. The feed mechanism os adjusted in order to break continuous chip according to the result of the chip form recognition and it shows a good approach for precision turning operation.

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Control of Identifier of Chip Form by Adjusting Feedrate Used Neural Network Algorithm (선삭에서 신경망 알고리즘에 의한 칩 형태의 인식과 제어)

  • Jun, J.U.;Ha, M.K.;Koo, Y.
    • Journal of Power System Engineering
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    • v.4 no.4
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    • pp.108-115
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    • 2000
  • The continuous chip in turning operation deteriorates the precision of workpiece and can cause a hazardous condition to operator. Thus the chip form control becomes a very important task for reliable turning process. Using the difference of energy radiated from the chip, the chip form is identified using the neural network of supervised data. The feed mechanism is adjusted in order to break continuous chip according to the result of the chip form recognition and shows a good approach for precision turning operation.

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AE센서와 감지판을 이용한 칩 형태 감지에관한 연구

  • 윤재웅
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.04b
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    • pp.300-304
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    • 1993
  • Chip formation control is an important problem in the automation of manufacturing process, since the continuous chip can cause catastrophic failures of the tooling and entangle the workpiece causing damage. However, it is impossible to predict chip form correctly due to the complex nature of cutting process. In order to detect the chip form for unmanned manufacturing, a new identification method is proposed. The feasibility of using acoustic emission signals from the sensing plate for identification of chip form is investigated. Experiments were conducted under the various cutting conditions. When the acoustic emission sensor is attached to the sensing plate, it turns out that the moving averaged AE signals correlated well with the collision of segmented chips with the plate. The sensitivity of moving averaged AE signals to chip congestions due to continuous chip formation is illustrated as well.

Comparative Study on Continuous Ethanol Fermentation by Immobilized Tubular Fermentor (고정화된 효모로 충전된 관형발효기에서의 에탄올 연속발효)

  • 서근학;최명호;송승구
    • Microbiology and Biotechnology Letters
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    • v.16 no.3
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    • pp.205-212
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    • 1988
  • The immobilized cell tubular tormentor was prepared by wood chips or alginate gel. Investigations of characterization of the performance of ethanol fermentation in the immobilized cell tubular tormentor were undertaken and the results were compared with those of other tormentors. The immobilized cell tormentor packed with alginate gel showed much higher ethanol productivity than that with wood chip. It was concluded that the immobilized cell tubular tormentor packed with alginate gel might offer better perspectives for continuous ethanol production than that with wood chip.

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