• Title/Summary/Keyword: Depth Machining

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The Effect of Matrix of Compact Vermicular Graphite Cast Iron on Machinability in Lathe Turning (CV 흑연주철의 기지조직변화가 절삭성에 미치는 영향)

  • An, Sang-Ook;Park, Jong-Bong
    • Journal of the Korean Society for Precision Engineering
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    • v.5 no.1
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    • pp.50-62
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    • 1988
  • An experimental investigation of the machining characteristics of compact vermicular cast iron whose matrix were formulated under two kinds of annealing conditions has been conducted. The various characteristics of the machinability of CA cast iron depending upon its matrix and cutting condition have been obtained from the experiment. The results are as follow. As depth of cut increases, the shear stress slightly decreases in order $P_1, \P_2, \P_3$ which are classified by ferrite matrix of CV cast iron. As depth of cut increases, the normal stress increases, and annealing effect in heavy cutting is smaller than that in light cutting. The cutting energy slightly decreases, as depth of cut increases and the effect of annealing on cutting energy in light cutting is higher than that in heavy cutting. The cutting equation in this study are as follow. $P_1\:\2{\phi}\ + \1.49({\beta} - {\alpha} )=84^{\circ}$ $P_2\:\2{\phi}\ + \1.36({\beta} - {\alpha} )=82^{\circ}$ $P_3\:\2{\phi}\ + \1.34({\beta} - {\alpha} )=79^{\circ}$ Machining constants in this study for $P_1, P_2, P_3$give $74^{\circ} , 66^{\circ}, 61^{\circ}$ Tool wear increases as depth of cut increases, and decreases as ferrit matrix increases.

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Experimental Research on the Surface Roughness Characteristics in Machining Center Machining of A5083 Alloy (A5083 합금의 머시닝센터 가공에서 표면거칠기 특성에 관한 실험적 연구)

  • Choi, Jin-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.9
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    • pp.57-62
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    • 2021
  • CNC machining is used to fabricate various components. This has led to the development of processing-based industries for the production of automobile, appliances, semiconductors, and rockets. Additionally, this machining has enabled economical mass production of high-quality products in industries. Magnesium alloy with a hexagonal closed packed configuration is prone to difficulties during plastic machining, has a high oxygen affinity, and exhibits poor corrosion resistance to seawater and the atmosphere. In this research, Al alloy A5083 was used to investigate and analyze the surface roughness with a certain depth of cut fixed by the machining center (DVM-500II) and various feed rates, speeds, and processing methods after modeling and simulated machining with Gibbs CAM.

Analysis of Size Effect of Nano Scale Machining Based on Normal Stress and Indentation Theories (수직응력과 압입이론에 기반한 나노스케일 기계가공에서의 크기효과 분석)

  • Jeon, Eun-chae;Lee, Yun-Hee;Je, Tae-Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.6
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    • pp.1-6
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    • 2018
  • Recently nano meter size pattern (sub-micro scale) can be machined mechanically using a diamond tool. Many studies have found a 'size effect' which referred to a specific cutting energy increase with the decrease in the uncut chip thickness at micro scale machining. A new analysis method was suggested in order to observe 'size effect' in nano scale machining and to verify the cause of the 'size effect' in this study. The diamond tool was indented to a vertical depth of 1,000nm depth in order to simplify the stress state and the normal force was measured continuously. The tip rounding was measured quantitatively by AFM. Based on the measurements and theoretical analysis, it was verified that the main cause of the 'size effect' in nano scale machining is geometrically necessary dislocations, one of the intrinsic material characteristics. st before tool failure.

Cutting method of tungsten carbide material using hot machining (고온가공기법을 이용한 초경소재 가공기술)

  • 이채문;이득우;정우섭;김상기
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.365-369
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    • 2004
  • The Advantages of hot machining are the reduction of cutting forces, tool wear, and the increase of material removal rates. In this study, a hot-machining using gas flame heating characteristics of milling by CBN tip was analyzed, and the influence of the surface temperature and the depth of cut on the tool life were investigated. The results show that hot machining of tungsten carbide-alloyed is more effective than conventional machining. In addition, some advantages obtained from hot machining, such as decrease of tool wear and cutting force, high surface quality.

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The Effects on a Side-Cut Grinding depend on the Change of the Quill Rigidity (퀼축강성 변화가 측면 연삭가공에 미치는 영향)

  • Choi, Hwan;Kim, Chang-Su;Park, Won-Kyue;Lee, Choong-Seok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.5
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    • pp.36-41
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    • 2013
  • One of the problems in grinding process using a machining center(MC) with a small diametric wheels is machining error due to decrease of the quill diameter. In this study, side-cut grinding is performed with a vitrified bonded CBN wheel on the machining center. Grinding experiments are performed at various grinding conditions including quill length, quill diameter and depth of cut. The effect on the grinding force, machining error and surface roughness due to the change of the quill rigidity are investigated experimentally. The slenderness ratio of the quill is significant factor to analyse the change of the grinding force and machining error.

A Study on Transition of Dimension Error and Surface Precision in High Speed Machining of Al-alloy (Al 합금의 고속가공에서 치수오차와 표면정도 추이고찰)

  • 정문섭
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.3
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    • pp.96-102
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    • 2000
  • High speed machining aims to raise the productivity and efficiency by making more precise and higher value-added products than any other machining method by means of the high speediness of spindle and feed drive system. The purpose of this study is to investigate the effects of the run-out of endmill on the dimension precision of workpiece and to obtain the fundamental data on high speed machining which is available by machining the side of Al-alloy with solid carbide endmills in high speed machining center and by measuring dimensions and surface roughness. From the results of experimentation following are obtained ; if spindle speed is ultra high in conditions that radial depth of cut and feed per tooth are very small highly precise and accurate products are to be made efficiently with high feed rate. and so we can raise productivity.

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Micro-shaft and Micro-hole Machining for Micro Punching (마이크로 펀칭용 미세축, 미세구멍의 가공)

  • Ryu S. H.;Cho P. J.;Lee K. H.;Chu C. N.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.02a
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    • pp.239-244
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    • 2002
  • In this study, we developed the manufacturing technology of micro-hole and micro-shaft for micro punching system using micro electrical discharge machining and micro electro chemical machining. Micro punching dies of tungsten carbide with $55\;{\mu}m\;and\;110\;{\mu}m$ diameter and $250\;{\mu}m$ depth were made by micro electrical discharge machining. The form accuracy and surface roughness of die hole were pretty good and it was shown that the punched hole quality was fine. WC micro-shaft with $30\;{\mu}m$ diameter was made by the multistep micro electro chemical machining. The developed technologies can be effectively used in precision manufacturing of micro punching die and mass production of micro-shaft.

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A Finite Element Analysis for the Characteristics of Temperature and Stress in Micro-machining Considering the Size Effect (크기효과가 고려된 미소절삭시의 온도 및 응력특성에 관한 유한요소해석)

  • 김국원;이우영
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.128-139
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    • 1998
  • In this paper, a finite element method for predicting the temperature and stress distributions in micro-machining is presented. The work material is oxygen-free-high-conductivity copper(OFHC copper) and its flow stress is taken as a function of strain, strain rate and temperature in order to reflect realistic behavior in machining process. From the simulation, a lot of information on the micro-machining process can be obtained; cutting force, cutting temperature, chip shape, distributions of temperature and stress, etc. The calculated cutting force was found to agree with the experiment result with the consideration of friction characteristics on chip-tool contact region. Because of considering the tool edge radius, this cutting model using the finite element method can analyze the micro-machining with the very small depth of cut, almost the same size of tool edge radius, and can observe the 'size effect' characteristic. Also the effects of temperature and friction on micro-machining were investigated.

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A study on the Analysis and Evaluation of Cutting forces for High Speed Machining by a Ball-end mill (볼엔드밀의 고속가공에서 절삭력 분석 및 평가에 관한 연구)

  • Lee Choon Man;Ryu Seung Pyo;Ko Tae Jo;Jung Jong Yun;Chung Won Jee
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.5 s.170
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    • pp.167-174
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    • 2005
  • High-speed machining is one of the most effective technologies to improve productivity Because of the high speed and high feed rate, high-speed machining can give great advantages for the machining of dies and molds. This paper describes on the analysis and evaluation of cutting force in high-speed machining. Cutter rotation directions, slope directions, spindle revolution and depth of cut are control factors for cutting force. The effect of the control factors on cutting force is investigated for the high speed machining of STD11.

Micro End-Mill Machining Characters and its Applications (마이크로 앤드밀의 가공특성분석 및 응용가공 연구)

  • Jae, Tae-Jin;Lee, Eung-Sook;Choi, Doo-Sun;Hong, Sung-Min;Lee, Jong-Chan;Choi, Hwan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.589-592
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    • 2003
  • In the machining process of micros shape by using high-precision machining system and micro end-mill, it is important for machining characters of tools to be grasped in order to stably use tools of micro end-mill. In this study. we carried out an analytical experiment of basic machining features by using end-mill tools for the purpose of damage prevention and manufacture of high quality when the tools of micro end-mill are used. This experiment used a micro machining system with high precision and a variety of end-mill tools commercialized from tens to hundreds microns in diameter. To establish an optimal machining condition without tool damage, cutting force was analyzed according to the changes of tool diameter and cutting conditions such as cutting speed. feed rate, depth of cut. And an examination was performed for the shape and surface illumination of machining surface according to the changes of machining conditions. Based on these micro machining conditions, micro square pillar, cylinder shaft. thin wall with high aspect ratio, and micro 3-D structures such as micro gear and fan were manufactured.

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