• Title, Summary, Keyword: Tool

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IMPROVEMENT OF TOOL LIFE IN COLD FORGING

  • Kim Soo Young;Yamanaka Masahito;Arima Tatsuo;Matsuda Toru
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.175-178
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    • 2003
  • Tool life in cold forging is influenced by tool quality as well as forging conditions and quality of forging material. This paper presents some typical examples of tool life improvement in aspect of tool quality depending on tool design and tool manufacturing parameters. For the purpose of improving tool life, suggestions should be based on accurate understanding of tool operating conditions in cold forging process. FE simulation known as CAE is effective in order to make clear the conditions by some numerically calculated result.

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Tool-Setup Monitoring of High Speed Precision Machining Tool

  • Park, Kyoung-Taik;Shin, Young-Jae;Kang, Byung-Soo
    • 제어로봇시스템학회:학술대회논문집
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    • pp.956-959
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    • 2004
  • Recently the monitoring system of tool setting in high speed precision machining center is required for manufacturing products that have highly complex and small shape, high precision and high function. It is very important to reduce time to setup tool in order to improve the machining precision and the productivity and to protect the breakage of cutting tool as the shape of product is smaller and more complex. Generally, the combination of errors that geometrical clamping error of fixing tool at the spindle of machining tool and the asynchronized error of driving mechanism causes that the run-out of tool reaches to 3$^{\sim}$20 times of the thickness of cutting chip. And also the run-out is occurred by the misalignment between axis of tool shank and axis of spindle and spindle bearing in high speed rotation. Generally, high speed machining is considered when the rotating speed is more than 8,000 rpm. At that time, the life time of tool is reduced to about 50% and the roughness of machining surface is worse as the run-out is increased to 10 micron. The life time of tool could be increased by making monitoring of tool-setup easy, quick and precise in high speed machining tool. This means the consumption of tool is much more reduced. And also it reduces the manufacturing cost and increases the productivity by reducing the tool-setup time of operator. In this study, in order to establish the concept of tool-setup monitoring the measuring method of the geometrical error of tool system is studied when the spindle is stopped. And also the measuring method of run-out, dynamic error of tool system, is studied when the spindle is rotated in 8,000${\sim}$60,000 rpm. The dynamic phenomena of tool-setup are analyzed by implementing the monitoring system of rotating tool system and the non-contact measuring system of micro displacement in high speed.

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Development of Tool Fracture Index for Detection of Tool Fracture in Milling Process (밀링시 공구 파손 검출을 위한 공구 파손 지수의 도출)

  • 김기대;오영탁;주종남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.881-888
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    • 1997
  • A new algorithm for detection of tool fracture in milling process was developed. The variation of the peak-to-valley value of cutting load was used in this algorithm. Various kinds of vectors representing the condition of tool, such as tool condition vector, reference tool condition vector, tool condition variation vector were defined. Using these vectors, tool fracture index which represents the magnitude of tool fracture and is independent of tool run-outs is developed. Small and large tool fracture and chipping under various cutting condition could be detected using proposed tool fracture index, which was proved with cutting force model and experiments.

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A Tool Selection and Tool Loading-Part Assignment Procedure to Minimize Operation Costs in FMS (FMS에서의 생산비용 최소화를 위한 공구 결정 및 공구로우딩-부품 할당 기법)

  • 나윤균;이동하
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.23 no.58
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    • pp.17-27
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    • 2000
  • In FMS where tool movement policy is adopted, a mathematical model has been developed which determines the selection of a tool type for each operation and tool loading-part assignment simultaneouly. The objective is to minimize the total cost of operation including machining time cost, tool cost, tool replacement and loading time cost, and tool change time cost. Due to the complexity of the problem, an approximate solution procedure has been developed utilizing the special structure of the model. Tool selection was determined first to allocate one tool type to each operation considering more than one tool type alternatives for each operation. Tool loading-part assignment was determined to minimize tile total number of tool changes due to part mix based on the tool selection.

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Tool Fracture Detection in Milling Process (I) -Part 1 : Development of Tool Fracture Index- (밀링 공정시 공구 파손 검출 (I) -제1편 : 공구 파손 지수의 도출-)

  • 김기대;오영탁;주종남
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.5
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    • pp.100-109
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    • 1998
  • In order to increase productivity through unmanned machining in CNC milling process, in-process tool fracture detection is required. In this paper, a new algorithm for tool fracture detection using cutting load variations was developed. For this purpose, developed were tool condition vector which is dimensionless indicator of cutting load and tool fracture index (TFI) which represents magnitude of tool fracture. Through cutting force simulation, tool fracture index was shown to be independent of tool run-outs and cutting condition variations. Using tool fracture index, the ratio of the tool fracture to feed per tooth could be indentified.

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Comparison of Machinability Between PCD Tool and SCD Tool for Large Area Mirror Surface Machining Using Multi-tool by Planer (평삭공정에서 경면가공을 위한 단결정 및 다결정 다이아몬드 다중공구의 가공성 평가)

  • Kim, Chang-Eui;Choi, Hwan-Jin;Jeon, Eun-Chae;Je, Tae-Jin;Kang, Myung-Chang
    • Journal of Korean Powder Metallurgy Institute
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    • v.20 no.4
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    • pp.297-301
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    • 2013
  • Mirror surface machining for large area flattening in the display field has a problem such as a tool wear and a increase in machining time due to large area machining. It should be studied to decrease machining time and tool wear. In this paper, multi-tool machining method using a PCD tool and a SCD tool was applied in order to decrease machining time and tool wear. Machining characteristics (cutting force, machined surface and surface roughness) of PCD tool and SCD tool were evaluated in order to apply PCD tool to flattening machining. Based on basic experiments, the PCD/SCD multi-tool method and the SCD single-tool method were compared through surface roughness and machining time for appllying large area mold machining.

Wear Detection of Coated Tool Using Acoustic Emission (음향방출을 이용한 코팅공구의 마멸검출)

  • 맹민재;정준기
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.9-16
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    • 2001
  • Turning experiments are conducted to investigate characteristics of acoustic emission due to wear of the coated tool. The AE signals are obtained with a sensor attached to tool holder side. Tool states are identified with scanning electron microscopy and optical microscopy. It is demonstrated that the AE signals provide reliable informations about the cutting processes and tool states. Moreover, tool wear can be detected successfully using the AE-RMS.

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NURBS Post-processing of Linear Tool Path (미소직선 공구경로의 NURBS 변환)

  • Kim, Su-Jin;Choi, In-Hugh;Yang, Min-Yang
    • Proceedings of the KSME Conference
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    • pp.1111-1117
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    • 2003
  • NURBS (Non Uniform Rational B-Spline) is widely used in CAD system and NC data for high speed machining. Conventional CAM system changes NURBS surface to tessellated meshes or Z-map model, and produces linear tool path. The linear tool path is not good for precise machining and high speed machining. In this paper, an algorithm to change linear tool path to NURBS one was studied, and the machining result of NURBS tool path was compared with that of linear tool path. The N-post, post-processing and virtual machining software was developed. The N-Post post-processes linear tool path to NURBS tool path and quickly shades machined product on OpenGL view and compares a machined product with original CAD surface. A virtual machined model of original tool path and post-processed tool path was compared to original CAD model. The machining error of post-processed NURBS tool path was reduced to 43%. The original tool path and NURBS tool path was used to machine general model using same machine tool and machining condition. The machining time of post-processed NURBS tool path was reduced up to 38%.

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Tool-Wear Characteristics of the Ceramic, CBN and Diamond Tools in Turning of the Presintered Low Purity Alumina (저순도 알루미나 예비소결체 선삭시의 세라믹, CBN 및 다이아몬드 공구의 마멸 특성)

  • Lee Jae-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.1
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    • pp.80-88
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    • 2006
  • In this study, unsintered and presintered low purity alumina ceramics were machined with various tools to clarify the machinability and the optimum cutting conditions. The main conclusions obtained were as fellows. Machined with ceramic tool, the ceramics presintered at the temperature range of $1000\~1100^{\circ}C$ showed the best machinability due to the adhesion formed in weared surface within a certain cutting speed range. In the above combination and conditions, the ceramic tool showed the highest productivity through all experiments. The life of CBN tool was longer in machining of the ceramics presintered at $1000^{\circ}C$ than in the case of that presintered at $600^{\circ}C$, but the diamond tool showed adverse tendency. In machining of the ceramics presintered at $1000^{\circ}C$, the ceramic tool exhibits the longest tool life in high speed, the tool lives became extremely worse in the order of CBN tool and diamond tool. However, in the case of the ceramics presintered at $600^{\circ}C$, the diamond tool shows the longest tool life, the tool lives was much worse in the order of CBN tool and ceramic tool.

Study on the tool temperature estimation for different cutting conditions in turning using a statistical method (통계적 기법을 이용한 선삭 가공 절삭조건에 따른 공구온도 예측)

  • 김성청;이응석;문홍현;송길용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.851-856
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    • 1997
  • This study is on the estimation of the tool temperature for different tool nose radius and cutting conditions in turning. The experiment has been performed in different cutting conditions such as cutting speed, feed rate, and depth of cut for the tool nose radius, 0.4R, 0.8R using SMC workpiece materials. Tool temperature is measured using thermo-couple which is embedded in the insert tip. Using a multiple linear regression method, the tool temperature can be determined as an exponential equation with cutting variables and tool nose diameters for different tool materials. The equations determined in this study show a good correlation for the cutting conditions and can be used for the tool temperature estimation. The result indicates that the tool temperature decreases for ~ncreasing the tool nose radius in general. Also, nose radius hardly influences on the tool temperature compared with cutting speed, feed rate and depth of cut.

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