• Title/Summary/Keyword: 공구 변형

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Uniform Scallop Height Tool Path Generation Using CL Surface Deformation (CL면 변형 방법을 이용한 균일한 조도의 공구 경로 생성)

  • Yang Min-Yang;Kim Su-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.6 s.237
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    • pp.895-903
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    • 2005
  • In this paper, we present a cutter location (CL) surface deformation approach for constant scallop height tool path generation from triangular mesh. The triangular mesh model of the stereo lithography (STL) format is offset to the CL surface and then deformed in accordance with the deformation vectors, which are computed by the slope and the curvature of the CL surface. In addition, the tool path which is computed by slicing the deformed CL surface is inversely deformed by those same deformation vectors to a tool path with a constant scallop height. The proposed method is implemented, and a tool path generated by the proposed method is tested by simulation and by numerical control (NC) machining. The scallop height was found to be constant over the entire machined surface, demonstrating much better quality than that of mesh slicing, under the same constraints for machining time.

Deformation analysis of Tool and Tool holder for Micromachining by FEM (FEM을 이용한 Micromachining용 Tool 및 Tool holder의 변형해석)

  • Min, Kyung-Tak;Jang, Ho-Su
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.1
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    • pp.87-92
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    • 2010
  • Micromachining technology using a ultra-precision micromachining system is widely applied in the fields of optics, biotechnology and analytical chemistry, etc. specially in microfabrication of fresnel lens, light guide panels of TFT-LED and PDP ribs with micro-patterns, machining errors have an effect on the performance of those products. The deflection of tool and tool holder is known to be one of the very important factors that is due to machining errors in micromachining. The deflections of diamond tool and tool holder used in micro-grooving are analysed by FEM. We analysed by FEM. With an linearity valuation of FEM, deflection of tool and tool holder is calculated by using the data of cutting force which is acquired from micro-V groove machining experiments in micromachining system.

Machining Error Compensation for Tool Deflection in Micro Slot-Cutting Processes for Fabrication of Micro Shapes (미세형상 가공을 위한 Micro Slot 가공에서의 공구변형에 의한 가공오차 보상)

  • Sohn, Jong-In;Yoon, Gil-Sang;Seo, Tae-Il
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.2
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    • pp.121-127
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    • 2008
  • Micro end-milling has been becoming an important machining process to manufacture a number of small products such as micro-devices, bio-chips, micro-patterns and so on. Despite the importance of micro end-milling, many related researches have given grand efforts to micro end-milling phenomenon, for example, micro end-milling mechanism, cutting force modeling and machinability. This paper strongly concerned actual problem, micro tool deflection, which causes excessive machining errors on the workpiece. To solve this problem, machining error prediction method was proposed through a series of test micro cutting and analysis of their SEM images. An iterative algorithm was applied in order to obtain corrected tool path which allows reducing machining errors in spite of tool deflection. Experiments are carried out to validate the proposed approaches. In result, remarkable error reduction could be obtained.

Form Error Prediction in Side Wall Milling Considering Tool Deflection (측벽 엔드밀 가공에서 공구 변형을 고려한 형상 오차 예측)

  • 류시형;주종남
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.43-51
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    • 2004
  • A method for form error prediction in side wall machining with a flat end mill is suggested. Form error is predicted directly from the tool deflection without surface generation by cutting edge locus with time simulation. Developed model can predict the surface form error about three hundred times faster than the previous method. Cutting forces and tool deflection are calculated considering tool geometry, tool setting error and machine tool stiffness. The characteristics and the difference of generated surface shape in up milling and down milling are discussed. The usefulness of the presented method is verified from a set of experiments under various cutting conditions generally used in die and mold manufacturing. This study contributes to real time surface shape estimation and cutting process planning for the improvement of form accuracy.

Representation of cutting forces and tool deflection in end milling using Fourier series (엔드밀 가공에서 푸리에 급수를 이용한 절삭력 및 공구변형 표현)

  • Ryu S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.781-785
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    • 2005
  • Cutting forces and tool deflection in end milling are represented as the closed form of tool rotational angle and cutting conditions. The discrete cutting forces caused by tool entry and exit are continued using the Fourier series expansion. Tool deflection is predicted by direct integration of the distributed loads on cutting edges. Cutting conditions, tool geometry, run-outs and the stiffness of tool clamping pan are considered for cutting forces and tool deflection estimation. Compared to numerical methods, the presented method has advantages in short prediction time and the effects of feeding and run-outs on cutting forces and tool deflection can be analyzed quantitatively. This research can be effectively used in real time machining error estimation and cutting condition selection for error minimization since the ferm accuracy is easily predicted by tool deflect ion curve.

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A Displacement Analysis of 2-Dimensional Tool Vibrator (2차원 공구진동기구의 변위 해석)

  • 손성민;임한석;안중환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.898-901
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    • 2000
  • In this paper, the theoretical tool displacement and surface roughness are analyzed based on the tool locus of a 2-dimensional tool vibrator. At first, the effects assuming no structural deformation of such variables as frequency, amplitude and phase difference that determine tool loci are simulated. The results show that larger amplitude and/or higher frequency makes better surface. However, a real tool vibrator has the structural deformation, much or less, depending on the excitation frequency. Applying FEM analysis to the deformation of a designed 2D tool vibrator according to the excitation, it has been proved that in this case the displacement is 5${\mu}{\textrm}{m}$ at 1KHz and almost 0 at 20KHz even under the same excitation amplitude.

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A Study on the Compensation of Milling Errors by Regenerating of Tool Trajectory (공구 궤적 재구성에 의한 밀링 가공 오차의 보상에 관한 연구)

  • 쟝이브하스퀘트;필립데팡세;서태일
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.11
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    • pp.137-144
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    • 1998
  • In this paper we present our research dealing with the problem of tool deflection during the milling. We try to compensate the errors by considering a new tool trajectory. In order to determine the compensated tool trajectory, the problem is divided in three steps : cutting forces model, tool deflection model and trajectory compensation. Starting from experimental data, we determine a cutting forces model., which allows us to anticipate the tool deflection along one nominal path. In order to determine the compensated tool trajectory, we propose in this paper a method of path compensation, called “mirror method”. This method of tool path optimization allows to minimize errors due to tool deflection. Several examples are processed in simulations and validated experimentally.

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Surface Generation in End Milling considering Tool Deflection (엔드밀 가공시 공구변형을 고려한 표면형성 해석)

  • 이상규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.119-124
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    • 1996
  • End milling operation is very important in machining precision components. Deterioration of surface roughness and surface geometry will cause more process for surface finishing. According to the feed rate and the cutting edge geometry, the cusp which is geometrically uncut surface is determined. To reduce the cost for dinishing operation after end milling, the cusp must be remaianed in small size as possible. Due to the cylindrical type of the end mill, tool deflection is one of the main problems in surface generation. The cutting resistance and the rigidity of the end mill will determine the size of tool deflection. One more important factor which deteriorate surface quality comes from the error in manufacturing end mills. Run-out of end mill which is the difference of the radius of each cutting edges will produce the difference of the cusp size in every rotation of end mill. These three major factors to the surface quality will be analized and the result will be compared with experimental ressult.

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Sound PSD Image based Tool Condition Monitoring using CNN in Machining Process (생산 공정에서 CNN을 이용한 음향 PSD 영상 기반 공구 상태 진단 기법)

  • Lee, Kyeong-Min
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.7
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    • pp.981-988
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    • 2022
  • The intelligent production plant called smart factories that apply information and communication technology (ICT) are collecting data in real time through various sensors. Recently, researches that effectively applying to these collected data have gained a lot of attention. This paper proposes a method for the tool condition monitoring based on the sound signal generated in machining process. First, it not only detects a fault tool, but also presents various tool states according to idle and active operation. The second, it's to represent the power spectrum of the sounds as images and apply some transformations on them in order to reveal, expose, and emphasize the health patterns that are hidden inside them. Finally, the contrast-enhanced PSD image obtained is diagnosed by using CNN. The results of the experiments demonstrate the high discrimination potential afforded by the proposed sound PSD image + CNN and show high diagnostic results according to the tool status.