• Title, Summary, Keyword: Flat End-milling Process

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Tool Deflection Estimation in Micro Flat End-milling Using Finite Element Method (유한요소법을 이용한 마이크로 평엔드밀링에서의 공구변형 예측)

  • Lim, Jeong-Su;Cho, Hee-Ju;Seo, Tae-Il
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.19 no.4
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    • pp.498-503
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    • 2010
  • The main purpose of this study strongly concerned micro machining error estimation by using FEM analysis of tool deflection shapes in micro flat end-milling process. For the precision micro flat end-milling process, analysis of micro cutting errors is mandatory. In general, tool deflection is a major factor which causes cutting error and limits realization of the high-precision cutting process. Especially, in micro end-milling process, micro tool deflection generates very serious problems in contrast to macro tool deflection. Methods which deal with compensation of cutting error by tool deflection in macro end-milling process have been studied plentifully but, few researches transact with micro scaled cutting tool deflection in micro cutting process. Therefore, the trend of micro tool deflection was estimated by using FEM analysis in this paper. Cutting forces were acquired by micro dynamometer and these were utilized in FEM analysis. In order to verify FEM analysis results, micro machining processes were carried out and real machined profiles were compared with FEM results. Finally through the proposed approach well suited FEM results were obtained.

A Study on Micro-grooves Cutting Using Flat-end Mill (플랫 엔드밀을 이용한 미세 홈 가공에 관한 연구)

  • 이재일;이채문;이득우
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.209-214
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    • 2002
  • Mechanical micro-engineering is an easy and cheap way to fabricate micro-structures. If the application of the conventional machining method using flat-end mill becomes available for the micro-manufacturing process, it will be advanced as an extension of the conventional machining process. In this study, micro-grooves cutting using flat-end mill(($\phi$8) was performed. The characteristics on flat-end milling was investigated to improve machinability of micro-grooves. The experiments were performed according to variations of spindle revolution, depth of cut, and feed rate. Machinability through various cutting conditions was evaluated by surface geometry, tool wear, and cutting force. The results show that micro V-grooves of width(pitch) 29${\mu}{\textrm}{m}$ were acquired by flat-end milling. The maximum and minimum roughness of the wall of grooves was 438 and 67nm, respectively

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A Study on Effect of Tool Wear Rate upon Cutting Tool Shape in a Titanium Rough Cut Machining (티타늄 황삭가공에 있어서 공구형상이 공구마모율에 미치는 영향에 관한 연구)

  • Jung, Hwa
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.10
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    • pp.27-33
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    • 2019
  • The aviation industry has grown beyond the simple processing and assembling of aircraft parts and now designs and exports finished aircraft. In this study, the vertical CNC milling rotational speed and feed rate were parameters to investigate the life of tools according to their shape: (flat, round, and ball end mill) in the rough cutting of titanium. These tools are widely used in aircraft manufacturing and assembly. The purpose of this study is to measure the cutting temperature generated during the cutting process and calculate the rate of tool wear. This will be accomplished by measuring the tool weight before and after cutting the specimen and to compare it with the results of previous studies. Our study showed that the maximum cutting temperature increased as cutting time, tool rotational speed, and feed rate increased. The highest cutting temperatures were recorded for the ball, round, and flat end mill, respectively. Tool wear for the ball, round, and flat end mill increased as the speed and feed rate increased. The flat end mill exhibited the highest rate of wear from a minimum of 0.62% to a maximum of 2.88%.

Compensation for Machining Error included by Tool Deflection Using High-Speed Camera (고속카메라를 이용한 절삭공구변형의 보상에 관한 연구)

  • Bae, J.S.;Kim, G.H.;Yoon, G.S.;Seo, T.I.
    • Transactions of Materials Processing
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    • v.16 no.1
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    • pp.15-19
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    • 2007
  • This paper presents an integrated machining error compensation method based on captured images of tool deflection shapes in flat end-milling processes. This approach allows us to avoid modeling machining characteristics (cutting forces, tool deflections and machining errors etc.) and accumulating calculation errors induced by several simulations. For this, a high-speed camera captured images of real deformed tool shapes which were cutting under given machining conditions. Using image processes and a machining error model, it is possible to estimate tool deflection in cutting conditions modeled and to compensate for machining errors using an iterative algorithm correcting tool paths. This corrected tool path can effectively reduce machining errors in the flat end-milling process. Experiments are carried out to validate the approaches proposed in this paper. The proposed error compensation method can be effectively implemented in a real machining situation, producing much smaller errors.

Application of Design of Experiment Optimum Working Condition in Flat End-Milling (평면 엔드밀의 최적 가공조건을 위한 실험계획법의 적용)

  • Lee, Sang-Jae;Bae, Hyo-Jun;Seo, Young-Baek;Park, Heung-Sik;Jun, Tae-Ok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.3
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    • pp.20-25
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    • 2003
  • The End-milling has been widely used in the industrial world because it is effective to cutting working with various shape. Recently the end-milling is demanded the high-precise technique with good surface roughness and rapid manufacturing time for precision machine and electronic elements. The cutting working of end-milling such as, cutting direction, revolution of spindle, feed rate and depth of cut have an effect on optimum surface roughness. This study was carried out to decide the working condition for optimum surface roughness and rapid manufacturing time by design of experiment and ANOVA. From the results of this study, the optimum working condition for end milling is upward cutting in cutting direction, 600rpm in revolution of spindle, 240mm/mm in feed rate, 2mm in axial depth of cut and 0 25mm in radial depth of cut. The design of experiment has become an useful method to select optimum working condition mend-milling.

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Study of Machined Surface Error Compensation for Autonomous Manufacturing System (자율가공 시스템을 위한 가공면 오차보상에 관한 연구)

  • 서태일
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.9 no.4
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    • pp.75-84
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    • 2000
  • The main goal of our research is to compensate the milled surface errors induced by the tool deflection effects, which occur during the milling process. First, we predict cutting forces and tool deflection amount. Based on predicted deflection effects, we model milled surface shapes. We present a compensation methodology , which can generate a new tool trajectory, which is determined so as to compensate the milled surface errors. By considering manufacturing tolerance, tool path compensation is generalized. To validate the approaches proposed in this paper, we treat an illustrative example of profile milling process by using flat end mill. Simulation and experimental results are shown.

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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.

Analysis on the Effects of Tool Rake Angle and Helix Angle of a Flat End-mill in the Milling of Ti-alloy (티타늄 합금의 밀링가공에서 평 엔드밀의 헬릭스각과 경사각의 영향 분석)

  • Ye, Dong-Hee;Koo, Joon-Young;Park, Young-Koon;Kim, Jeong-Suk
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.24 no.5
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    • pp.508-513
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    • 2015
  • In this study, the effect of the helix angle and rake angle of a flat end-mill in the milling of titanium alloy was investigated. Tool shape parameters such as helix angle and rake angle affect the cutting force, cutting zone temperature, vibration, and chip flow mechanism, which in turn determine tool life, surface integrity, and dimensional accuracy of the milling process. To investigate the effect of the helix and rake angles, a certain range of parameters was selected, and three-dimensional tool models were generated for finite element analysis (FEA) for each case. The cutting force and pressure on the tool flank face and rake face were investigated by FEA. Further, several tool models were proposed for machining tests. The cutting force characteristics were investigated by the machining tests.

Theoretical Estimation of Machined Surface Profile by Tool Alignment Errors in Ball-End Milling (볼 엔드밀링에서의 공구 정렬 오차에 의한 가공면의 이론적인 평가)

  • Shin Y.J.;Park K.T.;Lee J.H.;Kang B.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.627-628
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    • 2006
  • High speed milling process is emerging as an important fabrication process benefits include the ability to fabricate micro and meso-scale parts out of a greater range of materials and with more varied geometry. It also enables the creation of micro and meso-scale molds for injection molding. Factors affecting surface roughness have not been studied in depth for this process. A series of experiments has been conducted in order to begin to characterize the factors affecting surface roughness and determine the range of attainable surface roughness values for the high speed milling process. It has previously been shown that run-out creates a greater problem for the dimensional accuracy of pans created by high speed milling process. And run-out also has a more significant effect on the surface quality of milled parts. The surface roughness traces reveal large peak to valley variations. This run-out is generated by spindle dynamics and tool geometry. In order to investigate the relationship between tool alignment errors and surface roughness the scallop generating mechanism in the ball-end milling with tool alignement errors has been studied and simulated. The results indicate that tool alignment errors have no significant effects ell the dimension of scallops in for flat planes.

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Topography Analysis in High Speed Working by Flat Endmill (엔드밀에 의한 고속가공시 표면형상 해석)

  • Bae, H.J.;Lee, S.J.;Seo, Y.B.;Park, H.S.
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.79-88
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    • 2002
  • High speed machining system have been used in industrial because it is effective to a material manufacturing with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study proposed to decide best manufacturing cutting condition for surface roughness and rapid manufacturing tune by using computer Image processing system and 3D modelling. Until the 16,000 rpm, the surface roughness is decreased rapidly, but it is not over that. The 22,000 rpm is the spindle speed with the optimum surface in the high speed end-milling. In the case of the feed rate with 2,000 mm/mm and 8,000 mm/mm, the surface roughness is better than 4,000 mm/min and 6,000 mm/min. By using the 3D modelling, it is effectively represented shape characteristics of working surface m high speed end-milling.

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