• Title/Summary/Keyword: High Speed Precision Machining

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A Study on Transition of Dimension Error and Surface Precision in High Speed Machining of Al-alloy (Al 합금의 고속가공에서 치수오차와 표면정도 추이고찰)

  • 정문섭
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.3
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    • pp.96-102
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    • 2000
  • High speed machining aims to raise the productivity and efficiency by making more precise and higher value-added products than any other machining method by means of the high speediness of spindle and feed drive system. The purpose of this study is to investigate the effects of the run-out of endmill on the dimension precision of workpiece and to obtain the fundamental data on high speed machining which is available by machining the side of Al-alloy with solid carbide endmills in high speed machining center and by measuring dimensions and surface roughness. From the results of experimentation following are obtained ; if spindle speed is ultra high in conditions that radial depth of cut and feed per tooth are very small highly precise and accurate products are to be made efficiently with high feed rate. and so we can raise productivity.

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Optimization cutting speed in high speed ball end milling (고속 볼 엔드밀 가공에서 절삭속도 최적화)

  • 김경균;강명창;정융호;이득우;김정석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.895-898
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    • 2001
  • This paper presents an optimization cutting speed(OCS) program developed to improve the machining precision and tool life in high speed machining using ball end milling. This program optimized the cutting speed that is changing at any time in free surface machining of an automobile part like a connecting load die. The technique of optimization cutting speed makes the CAD/CAM-generated NC code go through a reverse post process, conducts cutting simulation, and obtain the effective tool diameter of the ball end milling. Then it changes the spindle revolution to within the range of critical cutting speed fit for the material of the workpieces depending upon the effective tool diameter. In this study, the machining precision and tool life were compared for the two connecting load dies processed using the general cutting method and the proposed optimization cutting speed technique, respectively.

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A Study on th High Speed Machining Evaluation Method through Shape Machining (형상가공을 통한 고속가공 시스템 평가방법에 관한 연구)

  • 손덕수;유중학;최성주;이우영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.992-995
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    • 2001
  • Several evaluation methods of conventional machine tools have been proposed by KS and ISO. Even though the accuracy of the tools can be evaluated with those methods, there are still no proper evaluation method of high sped machining. Because it is hard to evaluate characteristics of high speed machining such as decrease of cutting temperature, cutting force, and reduced machining time. Therefore, new evaluation method for high speed machine should be developed. In this paper, several shape of model have been proposed to evaluate cutting accuracy of high speed machine.

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A Study on the Effect of Dimensional Errors and Roundness in High Speed Cylindrical Machining Al-alloy (Al합금의 고속 원통가공에서 발생하는 치수오차와 진원도의 영향 고찰)

  • 윤종학;서성원;이헌철
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.17-24
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    • 2001
  • Recently, the requirements for high precision and efficiency machining are gradually increased to raise international competitiveness at the industrial fields of die and molds. This trend had made effects on the industrial fields in Korea and which needs fur studying of high precision and efficiency machining. This study is to investigate the effects of the non-out of end mill in the external cylindrical machining operated by solid carbide end mills with Al-alloy in high speed machining center relating to high spindle revolution and frost fred per minute on the dimensional precision, roundness of workpiece. From the results of experimentations followings are obtained; when Al-alloy is processed by the external cylindrical cutting of end milling through the high speed revolution, if the spindle revolution is higher relating to radial depth of cut, feed per tooth in very lower situation, finally, productivity can be raised because high precision and quality products are machined high efficiently.

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Development of Face Milling Cutter Body System for High Speed Machining (고속가공을 위한 정면밀링커터 바디시스템 개발)

  • Jang Sung-Min;Maeng Min-Jae;Cho Myeong-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.21-28
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    • 2004
  • In modem manufacturing industries such as the airplane and automobile, aluminum alloys which are remarkable in durability have been utilized effectively. High-speed machining technology for surface roughness quality of workpiece has been applied in these fields. Higher cutting speed and feedrates lead to a reduction of machining time and increase of surface quality. Furthermore, the reduction of time required for polishing or lapping of machined surfaces improves the production rate. Traditional milling process for high speed cutting can be machined with end mill tool. However, such processes are generally cost-expensive and have low material removal rate. Thus, in this paper, face milling cutter which gives high MRR has developed face milling cutter body for the high speed machining of light alloy to overcome the problems. Also vibration experiment to detect natural frequency in free state and frequency characteristics during machining are performed to escape resonance.

Rapid Manufacturing of Microscale Thin-walled Structures using a Phase Change Work-holding Method

  • Shin Bo-Sung;Yang Dong-Yol
    • International Journal of Precision Engineering and Manufacturing
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    • v.7 no.3
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    • pp.47-50
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    • 2006
  • High-speed machining is a very useful tool and one of the most effective rapid manufacturing processes. This study sought to produce various high-speed machining materials with excellent quality and dimensional accuracy. However, high-speed machining is not suitable for microscale thin-walled structures because the structure stiffness lacks the ability to resist the cutting force. This paper proposes a new method that is able to rapidly produce very thin-walled structures. This method consists of high-speed machining followed by filling. A strong work-holding force results from the solidification of the filling materials. Low-melting point metal alloys are used to minimize the thermal effects during phase changes and to hold the arbitrarily shaped thin-walled structures quickly during the high-speed machining. We demonstrate some applications, such as thin-walled cylinders and hemispherical shells, to verify the usefulness of this method and compare the analyzed dimensional accuracy of typical parts of the structures.

Machinability evaluation and development of monitoring technique in high-speed machining (고속 가공성 평가 및 가공상태 모니터링 기술 개발)

  • 김전하;김정석;강명창;나승표;김기태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.47-51
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    • 1997
  • The high speed machining which can improve the production and quality in machining has been adopted remarkably in dietmold industry. As the speed of machine tool spindle increases, the machinability evaluation and monitoring of high speed machining is necessary. In this study, the machinability of 30, 000rpm class spindle was evaluated by using the developed tool dynamometer and the machining properties of high hardened and toughness materials in high speed were examined. Finally, the in-process monitoring technologies of tool wear were presented through the prediction by the experimental formula and pattern recognition by the neural network.

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Determination of the Cutting Condition in High Speed-Machining Considering the Machining Efficiency (볼 엔드밀의 고속가공에서 가공능률을 고려한 가공조건의 선정)

  • 손창수;강명창;이득우;황경현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.965-969
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    • 1997
  • Due to the high feed rate,high speed machining (HSM) provide a great potential of rationalization for the machining Dies and Moulds. But determination of cutting condition is very difficult, because cutting mechanism of high speed machining is very complicated,especially using ball end-mill. This paoer gives a report on selection of the optimal cutting condition to improve the machining efficiency, And optimal machining condition is determined through the cutting force, FFT analysis of cutting force and surface roughness according to the cutting condition. Based on this experiment result,wear process and machining characteristics are evaluated.

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Experimental evaluation technique for condition monitoring of high speed machining (고속가공의 상태 감시를 위한 실험적 평가 기술)

  • 김전하;강명창;김정석;김기태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.84-87
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    • 2001
  • The high speed machining which cam improve the production and quality has been remarkable in die/mold industry with the growth of parts and materials industries. The speed of machine tool increases, but on the other hand, the response of sensors I not being improved. Therefore, the condition monitoring techniques for the machine too, tool and workpiece in high speed machining are incomplete. In this study, characteristics of the tool edge roughness were verified from the high frequency components of cutting force signals acquired by the high speed dynamometer. Also, the experimental evaluation technique for the machinability and condition monitoring in high speed machining was established by analyzing the cutting force, acceleration and surface roughness.

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Feedrate Scheduling for High Speed Machining Based on an Improved Cutting Force Model (향상된 절삭력 모델을 이용한 고속 가공의 이송속도 스케줄링)

  • 이한울;고정훈;조동우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.141-144
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    • 2003
  • This paper proposes an analytical model of off-line feed rate scheduling to obtain an optimum feed rate for high speed machining. Off-line feed rate scheduling is presented as an advanced technology to regulate cutting forces through change of feed per tooth, which directly affects variation of uncut chip thickness. In this paper, the feed rate scheduling model was developed using a mechanistic cutting force model using cutting-condition-independent coefficients. First, it was verified that cutting force coefficients are not changed with respect to cutting speed. Thus, the feed rate scheduling model using the cutting-condition-independent coefficients can be applied to set the proper feed rates for high speed machining as well as normal machining. Experimental results show that the developed fred rate scheduling model makes it possible to maintain the cutting force at a desired level during high speed machining.

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