• Title/Summary/Keyword: End Mill Shape

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Multi-stage NC Milling of Uncut Volume caused by Gouging Interference at the Machining of Curved Surfaces (곡면가공시 공구간섭에 따른 미절삭체적의 다단계 NC가공)

  • 맹희영;차지경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.439-444
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    • 2004
  • A new efficient intelligent machining strategy named the Steepest Directed Tree method is presented in this study, which makes surface model discrete with triangulation meshes and the cutter paths track along the tree directions. In order to formulate these algorithms practically, it is deduced the multi-stage machining approach of uncut volume caused by cutter gouging in the course of milling using flat end mill. It is systematized the checking process the cutter interference by grouping the 6 kinds of gouging types, which yields the environment of connectivity data lists including CL-data, and then the multi-stage machining strategy, that minimizes uncut area by continuously sequencing the generative subsequent CL-paths, is shamed to determine the second tool path for the next uncut area and to compose the operating multi-stage cutting processes. The completed machining system of curved surfaces is evaluated by testing the practical machining experiments which have various kinds of shape conditions.

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A Study on the characteristics of the spherical surface machining in CNC milling (CNC 밀링에 의한 구면 가공시의 가공특성에 관한 연구)

  • 한흥삼;이동주
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.52-57
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    • 1995
  • In order to suggest the proper cutting conditions of the CNC milling machining for the free-from surface, some experiments were carried out. In experiments, the influence of cutting conditions on the inclined spherical surface were examined by geometrical anlysis. In thos study, the roundness and cutting force were measured to know the effect of several cutting conditions on the machined surface and the cutting characteristics were carefully investigated. As the result, it was appeared that rigidder tool must be used and the cutting speed must be maintained constantlyfor more effective machining. It can be also known from the experiments that the improved machining surface obtained under about 80 degree, but coarse surface obtained over about 80 degree because of the existance of immproper shape of ball-end mill at the extreme portion.

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Tool Wear Characteristics of Tungsten Carbide Implanted with Plasma Source Nitrogen Ions in High-speed Machining (플라즈마 질소 이온 주입한 초경공구의 고속가공시 공구마멸 특성)

  • Park, Sung-Ho;Wang, Duck Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.21 no.5
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    • pp.34-39
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    • 2022
  • The ion implantation technology changes the chemical state of the surface of a material by implanting ions on the surface. It improves the wear resistance, friction characteristics, etc. Plasma ion implantation can effectively reinforce a surface by implanting a sufficient amount of plasma nitrogen ions and using the injection depth instead of an ion beam. As plasma ion implantation is a three-dimensional process, it can be applied even when the surface area is large and the surface shape is complicated. Furthermore, it is less expensive than competing PVD and CVD technologies. and the material is The accommodation range for the shape and size of the plasma is extremely large. In this study, we improved wear resistance by implanting plasma nitrogen ions into a carbide end mill tool, which is frequently used in high-speed machining

Machinability Evaluation according to Variation of Endmill Shape for High Speed Machining (고속가공용 엔드밀 형상변화에 따른 가공성 평가)

  • Kang, Myung-Chang;Kim, Jeong-Suk;Lee, Deuk-Woo;Kim, Kwang-Ho;Ha, Dong-Geun
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.5
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    • pp.133-138
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    • 2002
  • The technique of high speed machining is widely studied in machining fields, because the high efficiency and accuracy in machining can be obtained in high speed machining. Unfortunately the development of tool fur high speed machining in not close behind that of machine tool. In this study, 10 types flat endmill is prepared for obtaining data according to tool shape. Especially, we concentrated in helix angle, number of cutting edge and rake angle. Cutting condition is selected for several experiments and measuring cutting farce, tool life, tool wear and chip shape according to cutting length. 3-axis cutting farces are acquired from the tool dynamometer with high natural frequency, as the conventional tool dynamometer (9257B, Kistler) has cannot measure the state of high frequency force. Particularly, we found out that the axial cutting force waveform has a good relation with tool wear features. And flow is interrupted at the beginning of cutting by the decrease of rake angle. By above results. it is suggested the endmill tool with 45$^{\circ}$helix angle, 6 cutting edge and -15$^{\circ}$rake angle is suitable for high speed machining.

A Study on Machining of a Compressor Rotor using Formed Tools (총형공구를 이용한 압축기 로터 가공에 관한 연구)

  • Park S.Y.;Lim P.;Lee H.K.;Yang G.E.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1285-1288
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    • 2005
  • Screw rotors, the key parts of screw compressors, are used in compressing air and refrigerant due to their high productivity, compact size, low noise and maintenance. In general, a screw compressor is composed of a pair of rotors of complex geometric shape. The manufacturing cost of the screw rotors is high because the complicated helical shapes of the screw rotors are manufactured usually by the dedicated machine tools. In this study, rotor profile is divided into three parts for the efficient machining. The formed tools are designed and shared for the respective split region. By cutting the screw rotor using the formed tools, this method is more efficient than the end mill in machining rotor. Experimental results show that 4-axis machining using formed tools needs less time and has the accuracy.

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Machine Learning Data Analysis for Tool Wear Prediction in Core Multi Process Machining (코어 다중가공에서 공구마모 예측을 위한 기계학습 데이터 분석)

  • Choi, Sujin;Lee, Dongju;Hwang, Seungkuk
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.9
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    • pp.90-96
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    • 2021
  • As real-time data of factories can be collected using various sensors, the adaptation of intelligent unmanned processing systems is spreading via the establishment of smart factories. In intelligent unmanned processing systems, data are collected in real time using sensors. The equipment is controlled by predicting future situations using the collected data. Particularly, a technology for the prediction of tool wear and for determining the exact timing of tool replacement is needed to prevent defected or unprocessed products due to tool breakage or tool wear. Directly measuring the tool wear in real time is difficult during the cutting process in milling. Therefore, tool wear should be predicted indirectly by analyzing the cutting load of the main spindle, current, vibration, noise, etc. In this study, data from the current and acceleration sensors; displacement data along the X, Y, and Z axes; tool wear value, and shape change data observed using Newroview were collected from the high-speed, two-edge, flat-end mill machining process of SKD11 steel. The support vector machine technique (machine learning technique) was applied to predict the amount of tool wear using the aforementioned data. Additionally, the prediction accuracies of all kernels were compared.

A Study on the Optimal Cutting Depth upon Surface Roughness of Al Alloy 7075 in High-speed Machining (알루미늄 합금 7075의 표면 거칠기에 미치는 고속가공의 최적 절삭 깊이에 관한 연구)

  • Bae, Myung-Whan;Park, Hyeong-Yeol;Jung, Hwa
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.5
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    • pp.74-81
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    • 2013
  • The high-speed machining in the manufacturing industry field has been widely applied for parts of vehicles, aircraft, ships, electronics, etc., recently, because the effect of cost savings for shortening processing time and improving productivity is great. The purpose in this study is to investigate the effect of cutting depth on the surface roughness of workpiece with the spindle rotational speed and feed rate of high-speed machines as a parameter to find the optimal depth in the finishing for ball end mill of the aluminum alloy 7075 which is used much in aircraft parts. When the cutting depth for the respective feed rate and spindle rotational speed is varied from 0.1 mm to 0.7 mm at intervals of 0.2 mm in the wet finishing of the aluminum alloy 7075 by the insoluble cutting oils and high-speed machining used in the rough machining of previous study, the surface roughness values and the cutting temperature are measured. In addition, the cutting surface shapes of test specimens are observed by optical microscope and compared with respectively. It is found that the surface roughness values and the temperature generated during machining are increased as the feed rate and cutting depth are raised, but those are decreased as the spindle rotational speed is increased.