• Title/Summary/Keyword: High speed cutting tool

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Research on High-Efficiency Machining through Bottom-up Machining using CAD/CAM System (CAD/CAM시스템을 이용한 상향식 가공에 의한 고효율가공에 관한 연구)

  • Jeong, Dae Hoon;Han, Kyu-Taek
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.11
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    • pp.89-95
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    • 2019
  • In this research, the effect of roughing on tool load through bottom-up machining is investigated through actual machining. Generally, through the use of high-speed machining technology, machining methods, such as general roughing, operate by deepening the cutting depth for as long as the tool is able to withstand it, giving a slower feed rate, less cutting depth, and faster feed. However, when the cutting depth is deep, there is a problem in that the stepped shape of the cutting area is increased (e.g., by the shaking of the tool or the chipping load). However, if the cutting is performed less, the cutting time becomes relatively long. To compensate for these drawbacks and extend the service life of the tool, economic efficiency needs to be secured.

Prediction of Cutting Forces in High Speed End Milling (고속 엔드밀 가공에서의 절삭력 예측)

  • Jung, Sung-Chan;Kim, Kug Weon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.4
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    • pp.21-27
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    • 2005
  • Recently researches for high speed machining have been actively performed. Few analytical studies, however, have been published. In this paper, a model of cutting forces is analytically studied to predict cutting characteristics in end mill process, especially considering both feed rate and spindle speed. The developed cutting model is based on Oxley's machining theory, which predicts the cutting forces from input data of workpiece material properties, tool geometry and cutting conditions. Experimental verification has been performed to verify the predictive cutting force model using tool dynamometer. It has been found that the simulation results substantially agree with experimental results.

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Machinability Evaluation with Cutting Direction in High Speed Machining of Free Form Surface through Ball End Milling (볼 엔드밀을 통한 자유곡면의 고속가공에서 절삭방향에 따른 가공성 평가)

  • Kim, Gyeong-Gyun;Gang, Myeong-Chang;Lee, Deuk-U;Kim, Jeong-Seok
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.84-89
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    • 2001
  • In recent years, there is increasing demand of esthetic design and complex function in aerospace, automobile and die/mold industry, which brings into limelight high-precision, high-efficient machining of sculptured surface. This paper deals with the establishment of the optimal tool path on free form surface in high speed ball end milling. Ball end milling is widely used for free form surface die and mold. In this machining, the cutting direction was changed with tool path. The cutting characteristics, such as cutting force and surface form are varied according to the variation of cutting directions. In this paper, the optimal tool path with down cutting in free form surface cutting is suggested.

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A study on the Cutting Force Variation Comparison between Low CBN and Coated Low CBN Tools in Turning of SCM440 (Low CBN 코팅공구의 SCM440 선삭시 절삭력변화에 관한 연구)

  • Bang, Hong-In;Kim, Tea-Young;Oh, Sung-Hoon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.1
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    • pp.9-14
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    • 2013
  • In recent years, high hardness steel is used for most of the material in many areas including aircraft, nuclear power, space exploration and automotive parts. Low CBN tools are widely used in industrial field which can effectively process high hardness steel of HRC 45 or harder. The results of this study demonstrated, when high hardness steel, SCM440 is turned with Low CBN tools coated with TiN and TiAlN coatings respectively, that both the thrust force and cutting force tends to increase with more increase in cutting force than thrust force, as the feed rate increases at constant cutting speed. In addition, the size of the cutting force and thrust force does not change with the increased cutting speed at the same feed rate, but the tool life is reduced if the cutting speed is increased to shorten the machining time. Therefore, it is recommended to limit the cutting speed at 250 m/min maximum or less. Furthermore, comparing the cutting force of the three tools at the same cutting condition, Tin coating tool showed the smallest cutting force and Low CBN was the next, and the TiAlN coating tools showed the largest cutting force.

A Study on the Performance Evaluation of End Mill Tool Fabricated by Ultra-Fine WC (초미립 WC 소재 엔드밀 공구의 성능 평가에 관한 연구)

  • Kim, Do-Hyoung;Woo, Yong-Won;Lee, Hyun-Ho;Kim, Jeong-Suk
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.1-8
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    • 2007
  • The ultra-fine tungsten carbide(WC) powders have been actively used in the cemented carbides industry, because they have excellent mechanical properties such as high hardness, strength, and toughness. In this study, ultra-fine WC-Co alloys powders have been fabricated by thermochemical and thermomechanical process such as spray conversion process or high energy ball milling. The non-coated end-mill which is made of ultra-fine tungsten carbide is investigated by measuring cutting force, tool wear, tool life, and surface roughness profile according to cutting length. The machining test was conducted with high hardened workpiece and their performances are investigated in high speed cutting conditions. Also, the relationship between the machining characteristics and the Co contents are investigated under various high speed cutting conditions.

Wear of Partially Coated Tool in Interrupted Cutting (부분 피복된 HSS 공구의 단속절삭시의 마멸)

  • 김동욱;조용주;지용권;류병진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.67-72
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    • 1994
  • Tool test was conducted to investigate the were process of only flank face TiN coated HSS tool in interrupted cutting for variuos cutting speeds and feed rates. Flank wear was caused by microchipping at the cutting edge. At high cutting speed, the which was formed as a result of diffusion and abrasion lowered cutting edge and influenced flank were. Flank wear due to chipping was little influenced by cutting speed.

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A Study on the Evaluation on High-speed Machining Characteristics of AL7075 (AL7075의 고속가공특성 평가)

  • 이종현;이동주;이응숙;신보성
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.10a
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    • pp.220-224
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    • 2001
  • High-speed machining is one of the most effective technologies to improve productivity. Because of the high speed and high feedrate, high-speed machining can give great advantages for the machining of dies and molds. 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 force in high-speed machining, dynamometer has to have high natural frequency. In this paper, The dynamometer which has high natural frequency used to measure the cutting force in various cutting conditions. High-speed machining characteristics are evaluated by the cutting force, FFT analysis of the cutting force and chip formation.

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The Characteristics of Cutting Force and Surface Roughness According to Tool Tilting Angle in 5-axis High Speed Machining of Molds (금형의 5축 고속가공에서 공구 틸팅각에 따른 절삭력에 표면거칠기 특성)

  • Kang, Ik-Soo;Kim, Jeong-Suk;Kim, Suk-Won;Lee, Ki-Yong
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.5
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    • pp.63-69
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    • 2007
  • The high speed machining has been widely applied to manufacture dies and machine elements in industrial field. Especially, 5-axis milling has been employed to produce a wide range of turbine blades, impellers and complex molds. In this study, the machining characteristics of injection molds were investigated according to tool tilting angles in 5-axis milling. The cutting force and surface roughness were investigated with various tool tilting angles. When the tool tilting angle was over than 10 degree, the characteristics of cutting force and surface roughness were improved in machining of Al alloy.

Development on Tool Holder of Vibration Cutting System for Ultraprecision Machining (초정밀 가공을 위한 진동절삭 시스템의 Tool holder 개발 및 평가)

  • Lee, Se-Yun;Han, Jun-Ahn;Kim, Ji-Woon;Gwak, Yong-Kil;Kang, Dong-Bae;Ahn, Jung-Wahn
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.3
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    • pp.268-273
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    • 2011
  • In light guide panels, the PMMA sheet that is used in liquid crystal displays plays an important role in scattering the incident light and requires very fine machining as the sheet is directly related to the optical characteristics of the panels. High speed end milling(HSE) and high speed shaping(HSS) processes that are widely adopted and applied to the precise machining of light incident plane through vibration-assisted HSS for increasing the optical quality by minimizing the above-mentioned problems. The cutting tool and the tool post presented in this paper are designed by the authors to increase the magnitude of the cutting stroke by adopting the resonant frequency without weakening the stiffness and to reduce vibrations during even high speed feeding. The dynamic haracteristics of thecutting tool and the tool post are evaluated through simulation and experiment as well. The results reveal very appropriate dynamic characteristics for vibration-assisted HSS.

A study on the Tool Path Generation of High-Speed Machining by the Distortion of Original Tool Path (지령 경로의 왜곡에 의한 고속가공 경로의 생성에 관한 연구)

  • 이철수;이제필
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.5
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    • pp.15-28
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    • 1998
  • Recently may investigations have been studied on the high-speed machining by using machine tools. A CNC machine tool makes some tool path errors caused by software acceleration/deceleration. The faster a cutting feedrate is, the bigger the tool path errors are. Some known methods reduce these kinds of errors, but they make the total cutting time increased. This paper presents a feed-forward algorithm that can be generated by distorting the original tool path, and reduces the tool path errors and the total cutting time. The algorithm to generate a new tool path is represented as following; 1)calculating each distance of software acceleration/deceleration between two adjacent blocks, 2) estimating the distorted distance which is the adjacent-ratio-constant(k1, k2) multiply the distance of software acceleration/deceleration, 3) generating a 3-degree Bezier curve approximating the distorted tool path, 4) symmetrically transforming the Bezier curve about the intersection point between two blocks, and 5) connecting the transformed Bezier curve with the original tool path. The algorithm is applied to FANUC 0M. The study is to promote the high-precision machining and to reduce the total cutting time.

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