• Title/Summary/Keyword: Vibration Cutting

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Micro Milling using High Frequency 2-dimensional Vibration (2차원 고주파 진동을 이용한 미세 밀링가공)

  • Kim, Gi Dae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.6
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    • pp.66-70
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    • 2010
  • Using two piezoelectric materials orthogonally arranged, 2-dimensional(2D) vibration in a excitation workpiece table was generated. In this study, micro milling using high frequency 2D vibration was proposed, whose locus of cutting tool is combined with original trochoid locus of milling tool and 2D elliptical locus of excitation table. From the cutting results of 2D vibrational micro milling of nickel alloy, it was observed that the machining quality and the roughness of machined surface were enhanced compared to conventional milling in a side cutting whose immersion ration is relatively low, whereas there was little betterment in a slot cutting.

Prediction of Crack Initiation and Design of 40kHz Blade Horn for Ultrasonic Cutting (40kHz 초음파 커팅용 혼의 설계와 크랙발생에 대한 고찰)

  • Seo, Jeong-Seok;Lee, Yoon-Jung;Beak, Si-Young;Park, Dong-Sam
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.5
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    • pp.784-789
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    • 2012
  • Ultrasonic Cutting which uses a tuned blade resonant in a longitudinal mode, has been used to cut a range of materials from confectionery, baked products and frozen foods, to wood, bone, foams and composites. The Blade design typically uses finite element analysis, and it could be predicted vibration mode, gain and amplitude uniformity of the blade tip at resonant frequency. In this paper, FEA used to predict the vibration characteristic of the blade, and then the results were verified by analysis system of resonant frequency using the processed blade. The crack of the blade which is predicted from FEA was compared with the crack occurred by cutting experiment of rubber materials using the processed blade.

In-process Monitoring of Milling Chatter by Artificial Neural Network (신경회로망 모델을 이용한 밀링채터의 실시간 감시에 대한 연구)

  • Yoon, Sun-Il;Lee, Sang-Seog;Kim, Hee-Sool
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.5
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    • pp.25-32
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    • 1995
  • In highly automated milling process, in-process monitoring of the malfunction is indispensable to ensure efficient cutting operation. Among many malfunctions in milling process, chatter vibration deteriorates surface finish, tool life and productivity. In this study, the monitoring system of chatter vibration for face milling process is proposed and experimentally estimated. The monitoring system employs two types of sensor such as cutting force and acceleration in sensory detection state. The RMS value and band frequency energy of the sensor signals are extracted in time domain for the input patterns of neural network to reduce time delay in signal processing state. The resultes of experimental evaluation show that the system works well over a wide range of cutting conditions.

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Evaluation of Precision Cutting Performance by Bending Vibration Made Shapes of Main Spindle (주축 진동특성을 이용한 정밀가공 성능평가)

  • Park, Bo-Yong;Kim, Jong-Gwan
    • Journal of the Korean Society for Precision Engineering
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    • v.10 no.3
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    • pp.191-197
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    • 1993
  • In this paper, experimental studies are mainly carried out for the evaluation of precision cutting performance of a machine tool spincle running at high speed with the low load, in consideration of the bending vibration characteristics. As a result a process in presented for the practical application in the machine tools industry to evaluate the cutting performance in design stage of spindles.

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A study on the Cutting Noise Characteristics of Low-Noise Diamond Saw (저소음 다이아몬드톱의 절삭소음특성에 관한 연구)

  • Kim, K.H.;Byun, S.P.;Jung, K.J.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.228-233
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    • 2007
  • An experimental and numerical approach has been carried out to characterize the noise and the safety of circular diamond saw with chinks by laser-cutting. The sound pressure level of a circular diamond saw with chinks was measured when cutting workpieces. Therefore, frequency analysis results show us that the sound level was reduced as position of chinks approach to out-diameter. But the safety of circular diamond saw was lower due to the stress concentrated at the edge of chinks while cutting workpieces. FEM analysis was used for safety evaluation with the variation position of chinks. The noise characteristics of circular diamond saw were also estimated during cutting test.

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Bearing Lobe Profile and Cutting Force Modeling (베어링의 로브형상과 절삭력 모델링)

  • 윤문철;조현덕;김성근
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1998.10a
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    • pp.343-349
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    • 1998
  • A modeling of machined geometry and cutting force was proposed for the case of round shape machining, and the effects of internally machined profile are analyzed and its realiability was verified by the experiments of roundness tester, especially in boring operation in lathe. Also, harmonic cutting force model was proposed with the parameter of specific cutting force, chip width and chip thickness, and in this study, we can see that bored workpiece profile was also mapped into cutting force signal with this model. In general, we can calculated the theoretical lobe profile with arbitrary multilobe. But in real experiments, the most frequently measured numbers are 3 and 5 lobe profile in experiments. With this results, we can predict that these results may be applied to round shape machining such as drilling, boring, ball screw and internal grinding operation with the same method.

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Design Modifications of a Glass Cutting Machine for the Improved Stability (가공정도 향상을 위한 Glass Cutting Machine의 설계 개선)

  • Kwon, In-Hwan;Ro, Seung-Hoon;Park, Yu-Ra;Yi, Il-Hwan;Kil, Sa-Geun;Park, Keun-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.3
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    • pp.6-14
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    • 2014
  • Touch panels are widely used in the modern display industry as the cover glass of smart mobile phones and tablet PCs. Glass cutting machines are commonly used to cut the panels into their proper sizes. Vibration of these glass cutting machines is assumed to be the main factor leading to the creation of burrs, notches, cracks, scratches and chips on the cut surfaces, eventually causing defects of the cover glass. In this study, the vibrations of a glass cutting machine used for the shearing of cover glass components were analyzed through an experiment and a computer simulation. The structural properties leading to vibration were also analyzed in an effort to determine design alterations which can suppress these vibrations. Moreover, each design alteration was applied to a computer simulation model to determine the effect of different alteration on suppressing vibration. The results show that simple design alterations can substantially suppress vibrations of glass cutting machines.

Response Analysis of Ground Vibration for Cutting and Embankment Transition Zone Structure (절성토 접속구조별 지반진동 응답특성)

  • Lee, Il-Wha;Yun, Won-Min;Choi, Won-Il;Hwang, In-Hwan;Hwang, Sung-Wook
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.3195-3200
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    • 2011
  • The vibration resulting from railway operation is transmitted through the track and line structure, ground movements to adjacent buildings. As these vibration is growing, there is occurred exaggerated forces and displacements of the track and line structure and it is causing the differential settlement. It is difficult to clarify the dynamic response characteristics of trackbed because of various environmental conditions. However, track irregularity be affected by ununiformed bearing capacity and its dynamic response, study for dynamic response characteristics is required to investigate the cause of track irregularity and countermeasure. This study was intended to evaluate the numerical analysis which exam the response analysis characteristic of ground vibration by shape of cutting and embankment transition zone. The original method of analysis were have to examine variables such as directions, angles, drain conditions, linear conditions. However, In the analysis there were to consider the effect of moving loads according to directions of cutting and embankment transition zone.

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Machining of Micro Structure using Elliptical Vibration Grooving Machine (타원궤적 진동절삭 가공기를 이용한 미세 형상 가공)

  • Kim, Gi-Dae;Loh, Byoung-Gook
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.11
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    • pp.45-51
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    • 2008
  • Successive micro-scale V-grooves and a grid of pyramids were machined by elliptical vibration tufting (EVC) to investigate feasibility of using EVC as an alternative method of creating micro-molds to photo-lithography and electroforming, which have been commonly employed. An elliptical vibration grooving machine was developed which consists of two orthogonally-arranged piezoelectric actuators, a diamond cutting tool, and a motorized xyz stage. The micro-scale features were machined on materials of copper, duralumin, nickel, and hastelloy and it was found that EVC significantly reduces cutting resistance and prohibits generation of side burrs and rollover burrs, thus resulting in improving machining qualify of micro-molds in ail experimented workpiece materials.