• Title/Summary/Keyword: High speed cutting tool

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Evaluation of vibration property and machinability of spindle system in high speed machining center (고속 머시닝센터의 주축계 진동특성과 가공성 평가)

  • 김전하;강명창;김정석;김기태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.16-21
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    • 2002
  • The high speed machining center(HMC) has been widely applied to manufacture a die and trial product in many machine industry. Because the evaluation fer the HMC is not sufficiently performed and the efficient cutting conditions aren't selected, a great loss has been caused in the cost aspect. In this study, the need of preliminary running time and unstable spindle speed is presented from the analysis of acceleration in idling. The Machinability fur the TiAlN coated flat end mill and STD11( $H_{R}$C60) is evaluated from the trends of tool wear and cutting force according to cutting conditions and slenderness ratio and a low response of tool dynamometer in high speed is proved. The resonance spindle speed is identified through the tool wear and natural frequency test.t.

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The study on improving tool life using compressed chilly air (압축냉각공기를 이용한 공구수명 향상에 관한 연구)

  • 김찬우;이채문;이득우;김정석;정우섭
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.510-515
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    • 2003
  • High-speed machining generates concentrated Thermal/fractional damage at the cutting edge and rapidly decreases the tool life. This paper is aimed at improving the tool life using compressed chilly air. In this paper, the experiments were carried out in various cutting environments, such as dry, wet and compressed chilly air. Tool life were measured to evaluate machinability in high-speed milling of various materials. With respect to the cutting environment, compressed chilly air increased tool life. However, the wet condition decreased tool life due to the thermal shock caused by excessive cooling.

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The Characteristics of High-speed Noncircular Machining Tool Feed Systme using Linear Motor (리니어 모터를 이용한 고속비진원 가공용 공구이송장치의 특성연구)

  • 서준호;민승환;김성식;이선규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.985-990
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    • 1995
  • Recently, the development of high speed and high precision NC-lathe for piston head machining is needed for the complexity and diversity of the piston head shape used in automobile reciprocating engine. THe piston head has many complex shapes in the aspect of fuel economy, such as ovality, profile, double ovality and recess. Among them, for the maching of the over shape of 0.1~1mm the cutting tool should move periodically symchronized with the rotation of piston workpiece. The cutting tool feeed system must have high positioning accuracy for the precise machining, high speed for the fast maching and high dynamic stiffness for the cutting force. The linear brushless DC motor is used for satisfying these coditions. The ballbush guide and supporting guide using turcite is used for the guidance of the feed drive system. Linear encoder, digital servo ampllifer and controller are used for driving the motor. THis paper presents the design and simulation of the new tool feed system for noncircular machining.

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Continuous Tool-path Generation for High Speed Machining

  • Lee, Eung-Ki;Hong, Won-Pyo;Park, Jong-Geun
    • International Journal of Precision Engineering and Manufacturing
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    • v.3 no.4
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    • pp.31-36
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    • 2002
  • A continuous tool-path, that is to cut continuously with the minimum number of cutter retractions during the cutting operations, is developed in order to minimise the fluctuation of cutting load and the possibility of chipping on the cutting edge in HSM (high-speed machining). This algorithm begins with the offset procedure along the boundary curve of the sculptured surface being machined. In the of offset procedure, the offset distance is determined such that the scallop height maintains a constant roughness to ensure higher levels of efficiency and quality in high-speed machining. Then, the continuous path is generated as a kind of the diagonal curve between the offset curves. This path strategy is able to connect to neighbor paths without cutter retractions. Therefore, the minimum tool retraction tool-path can be generated And, it allows the sculptured surface incorporating both steep and flat areas to be high-speed machined.

Prediction of Cutting Temperature in Flank Face at High Speed Steel in Orthogonal Turning (2차원 선삭시 고속도강 공구의 플랭크면 절삭온도 예측)

  • Jun, Tae-Ok;Bae, Choon--Eak
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.1
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    • pp.222-231
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    • 1996
  • Temperature distribution on the flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junciton imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with igh speed steel. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.

Evaluation of Vibration Characteristics and Machinability of High Speed Machining Center (고속 머시닝센터의 진동특성 및 가공성 평가)

  • 강익수;강명창;김정석;김기태
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.424-429
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    • 2004
  • The high speed machining center(HMC) has been widely applied to manufacture a die and trial product in many machine industry. Because the evaluation for HMC is not sufficiently performed and the efficient cutting conditions can't be selected, a peat loss has been caused in the cost aspect. In this study, the need of preliminary running time and unstable spindle speed is presented by the analysis of acceleration in idling. The Machinability for the TiA1N coated flat end mill and STD11 (H$\sub$R/C60) is evaluated from the trends of tool wear and cutting force according to cutting conditions . The resonance spindle speed is identified through the tool wear and natural frequency test.

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Development of 3-Component tool Dynamometer for Evaluation of Machinability in High Speed Machining (고속가공에서 가공성 평가를 위한 3축 공구동력계 개발)

  • Kang, Myeong-Chang;Kim, Jeong-Suk;Lee, Deuk-Woo;Lee, Ki-Yong;Kim, Jeong-Hun
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.5 s.98
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    • pp.11-18
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    • 1999
  • Recently high speed machining is being studied actively to reduce machining time and to improve machining precision. To perform efficient high speed machining, evaluation of high speed machinability must be studied preferentially and it can be identified by investigation of cutting force. To measure cutting forces in high speed machining, dynamometer which has high natural frequency was newly designed using 3-axes piezo force sensor. For newly designed dynamometer, calibration is conducted with sensitivity of force sensor modulated and proper preload and interference force are investigated experimently. Also, cutting force signals of newly designed dynamometer are compared with those of conventional one in high speed cutting experiment and its superiority is confirmed. Then using newly designed dynamometer, high speed machinability is evaluated about cutting force and tool wear in various cutting conditions.

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Control of Tool Wear in Diamond Cutting of Steels by Intermittent Cutting Method (철강재료의 다이아몬드절삭에 있어서 단속절삭가공법의 적용에 의한 공구마모억제)

  • Chan, Song-Young;Kentaro, Nezu;Park, Chun-Hong;Toshimichi, Moriwaki
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.6
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    • pp.40-46
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    • 2008
  • Ultraprecision cutting of steels with geometrically defined single crystal diamond tools is handicapped by excessive tool wear. This paper presents a new approach to suppress the wear of single crystal diamond tool in cutting of steels. In general, it is said that the wear of diamond tool is caused by chemically reactive wear under high temperature and high pressure conditions. In order to suppress such chemical reactions, the time of contact between the diamond tool and the steel work in cutting was controlled by employing the intermittent cutting method such as fly-cutting. Series of intermittent cutting experiments have been carried out to control the tool-work contact time by changing one cycle of cutting length and cutting speed. The experimental results were shown that the tool wear was much dependent on the contact time regardless of the cutting speed, and that the wear was much suppressed by reducing the tool-work contact time. It is expected that the steels can be successfully cut with a single crystal diamond tool by controlling the contact time.

A Study on the Polishing Moving Type and the Cutting Characteristics of Magnetic Polished Tool (자기연마공구의 연마운동방식과 절삭특성에 관한 연구)

  • Jung, Sung-Yong;Yang, Sun-Cheul;Jung, Yoon-Gyo
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.2
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    • pp.28-34
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    • 2008
  • Recently, with the development of high speed machining technology for difficult-cutting materials, to improve the cutting performance of cutting tool, fine surface finish of complex shape tools using magnetic polishing technology is in high demand. This study is, therefore, discussed and compared the cutting characteristics of polished tools by the adopted various magnetic polishing moving types a point of view the cutting forces and the tool life. Moreover, the practicality of magnetic polished tools in the wide range cutting conditions is investigated. From obtained results, It is confirmed that the CW(clockwise) revolution and oscillation type as the polishing moving type is proper and magnetic polished tool shows the excellence in high cutting speed range.

Evaluation of Machinability by Cutting Environments in High-Speed Machining of Difficult-to-cut Materials(Test for Tool Life Using Compressed Chilly Air Cooling) (난삭성 재료의 가공환경변화에 따른 고속가공 특성 평가(압축공기냉각에 의한 공구수명 평가))

  • 김석원;안철수;이득우
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.6
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    • pp.158-163
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    • 2000
  • High speed machining of difficult-to-cut materials generates the concentrated thermal/frictional damage at the cutting edge of the tool and rapidly decreases the tool life. In this paper, the cutting environments, such as dry, fluid coolant, and compressed chilly air coolant, were investigated to improve the tool life. For this study, the compressed chilly air system was manufactured. The experiments were performed for various difficult-to-cut materials and various coated tools. The effectiveness of the developed methods on the basis of tool life was estimated. The results show that the cutting environment using compressed chilly air coolant provided better tool life than using the fluid coolant or using the dry.

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