• Title/Summary/Keyword: Compressed chip

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A Study on Surface Corrosion of Compressed Chip of Al-lithium Alloy according to the Packing Method (포장방법에 따른 Al-Li합금 압축칩 표면부식에 관한 연구)

  • Lee, In-Su;Kim, Hae-Ji;Kim, Deok-Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.5
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    • pp.137-141
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    • 2012
  • In order to increase recyclability of new material, aluminium-lithium alloy(Al2050-T84), the chip is compressed in the type of cylinder after machining. This study is to review the effect of environmental condition such as temperature change and salt during the transportation by sea on the corrosion at the surface and inside of the compressed chip, and an effective packing method is presented in this paper.

A study on machining of aircraft parts using compressed chilly air system (압축냉각공기 시스템을 적용한 항공기 부품 가공 기술)

  • 이채문;이득우;김석원;정우섭;김상기
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.315-320
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    • 2004
  • Cutting fluid usually has been used in order to improve machinability, tool life, surface quality. However, problems such as pollution, costs of chip and fluid treatment caused. In this paper, compressed chilly air was used to machine aircraft parts and investigate possibility and advantage of that. The experiments were carried out in various cutting environments, such as wet and compressed chilly air. With respect to the cutting environment, compressed chilly air gave advantages such as decrease of pollution and easy chip treatment.

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An On-chip Cache and Main Memory Compression System Optimized by Considering the Compression rate Distribution of Compressed Blocks (압축블록의 압축률 분포를 고려해 설계한 내장캐시 및 주 메모리 압축시스템)

  • Yim, Keun-Soo;Lee, Jang-Soo;Hong, In-Pyo;Kim, Ji-Hong;Kim, Shin-Dug;Lee, Yong-Surk;Koh, Kern
    • Journal of KIISE:Computer Systems and Theory
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    • v.31 no.1_2
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    • pp.125-134
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    • 2004
  • Recently, an on-chip compressed cache system was presented to alleviate the processor-memory Performance gap by reducing on-chip cache miss rate and expanding memory bandwidth. This research Presents an extended on-chip compressed cache system which also significantly expands main memory capacity. Several techniques are attempted to expand main memory capacity, on-chip cache capacity, and memory bandwidth as well as reduce decompression time and metadata size. To evaluate the performance of our proposed system over existing systems, we use execution-driven simulation method by modifying a superscalar microprocessor simulator. Our experimental methodology has higher accuracy than previous trace-driven simulation method. The simulation results show that our proposed system reduces execution time by 4-23% compared with conventional memory system without considering the benefits obtained from main memory expansion. The expansion rates of data and code areas of main memory are 57-120% and 27-36%, respectively.

Cutting Characteristics of Dry Turning Using Compressed Air (압축공기를 이용한 건식 선삭가공의 절삭특성)

  • Song Chun-Sam;Kim Joo-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.1
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    • pp.8-14
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    • 2005
  • The purposes of using cutting fluid during cutting have been cooling, lubricating, chip washing, and anti-corroding. However, the present manufacturing industry restricts the use of cutting fluid because cutting fluid contains poisonous substances which are harmful to the human body. Therefore dry cutting becomes an unavoidable assignment and a lot of researches have studied cutting methods without using cutting fluid. Because dry turning is a continuous work, tools life is reduced by continuous heat generation and surface gets rough due to reduced lubrication, so it is important to consider these situations. In this paper, the way of selecting the optimal machining condition by the minimum number of experiments and the effectiveness of using compressed air in high hardness materials through Taguchi method have been found. Dry cutting using compressed air showed better cutting characteristics than normal dry cutting with respect to by cutting force, tool wear, and surface roughness. Also, the optimal machining condition f3r dry cutting using compressed air could be selected through Taguchi method.

A Study on Simulation of Chip Recycling System for the Management of Cutting Chip in 5-Axis FMS Line (5축 FMS라인의 절삭 칩 처리를 위한 칩 회수처리장치 시뮬레이션에 관한 연구)

  • Lee, In-Su;Kim, Hae-Ji;Kim, Deok-Hyun;Kim, Nam-Kyung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.6
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    • pp.175-181
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    • 2013
  • The primary element of machining automation is to maximize the utilization of machine tools, which determines the output and lead-time. In particular, 95% of raw materials for wing ribs are cut into chips and 0.6 ton of chips are generated every hour from each machine tool. In order to verify the chip recycling system that controls the chips from the machines in five-axis FMS line, a simulation of the virtual model is constructed using the QUEST simulation program. The optimum speed of the chip conveyor and its operating conditions that directly affect the efficiency of the FMS line are presented including the chip conveyor speed, the maximum capacity of the hopper, and the number of chip compressors.

A Study on the Design of Compression Air Hole in Front of Spindle for Chip Removal (주축 전면부 칩 제거를 위한 압축공기 구멍 설계에 관한 연구)

  • Kang, Dong Wi;Lee, Choon Man
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.3
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    • pp.278-283
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    • 2013
  • While Built-in Spindle is working in machining center, the tool is changed by ATC(Automatic Tool Changer) automatically. However, impurities could be stacked in front of spindle because of chips formation while machining, and positional error between spindle and tool could be generated. Compressed air holes are necessary for removal of the impurities. But, the diameter and number of compressed air hole are different for each built-in spindle in market. In this paper, flow analysis is carried out to find out the efficient figuration of the compressed air hole by using velocity and pressure distributions.

A Design and Development of Multi Air gun for suction and shooting a jet of compressed air (압축공기의 흡입과 분사를 위한 멀티 에어건의 설계 개발)

  • Jeong, Seok-Min;Jang, Sung-Min
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.11
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    • pp.4944-4949
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    • 2012
  • The purpose of this paper is concerned with a development of air gun for use at work. A air gun is the tool to remove of cutting fluid and workpiece chip in industrial field used machine tool. And it generally is used to shoot a jet of compressed air. Worker must prepare respectively air gun for suction and shooting a jet of compressed air. Therefore we has developed new air gun. In this paper we research for design and analysis of it. The air gun is composed of body, pipe, opening and shutting unit, turning unit, air tube and elements for fabrication. The developed air gun is experimented to confirm the efficiency.

High Speed Ball End Milling for Difficult-to-Cut Materials

  • Lee, Deug-Woo
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.06a
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    • pp.19-27
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    • 2000
  • High speed machining (HSM), specifically end milling and ball end cutting, is attracting interest in the die/mold or aerospace industries for the machining of complex 3D surfaces. HSM of difficult-to-cut materials such as die/mold steels, titanium alloys or nickel based superalloys generates the concentrated thermal/frictional damage at the cutting edge of the tool and rapidly decreases the tool life. Following a brief introduction on HSM and reated aerospace or die/mold work, the paper reviews published data on the effect of cutter/workpiece orientation and cutting environments on tool performance. First, experimental work is detailed on the effect of cutter orientation on tool life, cutting forces, chip formation, specific force and workpiece surface roughness. Cutting was performed using 8 mm diameter PVD coated solid carbide cutters with the workpiece mounted at an angle of 45 degree from the cutter axis. A horizontal downwards cutting orientation proveded the best tool life with cut lengths ∼50% longer than for all other directions (horizontal upwards, vertical downwards, vertical upwards). Second, the cutting environments were investigated for dry, flood coolant, and compressed chilly air coolant cutting. The experiments were performed for various hardened materials and various coated tools. The results show that the cutting environment using compressed cilly air coolant provided better tool life than the flood coolant or the dry.

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Muscle Fatigue Nlonitoring Using a DSP Chip and PC (DSP칩과 PC를 이용한 근피로도 측정)

  • Cho, I. J.;Lee, J.;Choi, Y. H.;Kim, S. H.
    • Journal of Biomedical Engineering Research
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    • v.9 no.2
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    • pp.211-214
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    • 1988
  • As a muscular contraction is sustained, the power spectrum of the myoelectric signal is compressed into lower frequencies. The median frequency appears to be the prefered parameters to monitor this compression. This paper describes a technique and a device which provide an estimate of the median frequency using a TMS32020 DSP chip and IBM PC for tracking of this parameter. Results obtained from myoelectric signal are presented and discussed.

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Muscle fatigue monitoring using a DSP chip and PC (DSP칩과 PC를 이용한 근피로도 측정)

  • Cho, I. J.;Lee, J.;Choi, Y. H.;Kim, S. H.
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.714-717
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    • 1988
  • As a muscular contraction is sustained, the power spectrum of the myoelectric signal is compressed into lower frequencies. The median frequency appears to be the prefered parameters to monitor this compression. This paper describes a technique and a device which provide an estimate of the median frequency using a TMS32020 DSP chip and IBM PC for tracking of this parameter. Results obtained from myoelectric signal are presented and discussed.

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