• Title/Summary/Keyword: high precision machining

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Development of a high precision CNC lathe for mirror surface machining (경면가공용 고정밀 CNC 선반 개발)

  • 박청홍;이후상;신영재;이군석;김춘배
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.3
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    • pp.82-88
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    • 1997
  • In this paper, the development of a precision CNC lathe prototype for mirror surface machining is presented. To obtain high precision machining accuracy, a hydrostatically supported precision spindle and a sliding guideway with turcite pad are adopted as the motion elements. The machining accuracy of the prototype machine, and the motional accuracy of its motion elements are tested and evaluated to confirm the validity of the application of these elements on the prototype. The hydrostatic spindle shows 0.09 .mu. m of rotational accuracy and the guideway shows about 0.8 .mu. m/170mm of horizontal straightness. The sur- face roughness of cupper and aluminium cylinder machined by the prototype machine with diamond tool are 0.07 .mu. m and 0.10 .mu. m Rmax respectively. From these results, it is verified that the prototype lathe is avail- able for high precision machining.

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Design Technology of High Speed and Precision Machining Center (초곡속 고정밀 머시닝 센터 설계 기술)

  • Kim, Bup-Min;Choi, Won-Sun;Ha, Jae-Young;Kim, Tae-Hyoung
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.8
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    • pp.869-877
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    • 2011
  • In order to manufacture precision parts which are used for IT and BT Industry by machining, users need higher speed & precision machining center. So, for development of this kind of machine, we designed gantry type machining center which is piling of 3 axes on one moving body and the 2-axis rotary table is fixed on the base. It is applied linear motor that is instead of ball-screw and servo-motor combination and 50,000 rpm high-speed spindle. Composite material structure called mineral casting or resin concrete is applied also. This paper presents design technology and evaluated results of high speed and precision machining center.

Tool-Setup Monitoring of High Speed Precision Machining Tool

  • Park, Kyoung-Taik;Shin, Young-Jae;Kang, Byung-Soo
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.956-959
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    • 2004
  • Recently the monitoring system of tool setting in high speed precision machining center is required for manufacturing products that have highly complex and small shape, high precision and high function. It is very important to reduce time to setup tool in order to improve the machining precision and the productivity and to protect the breakage of cutting tool as the shape of product is smaller and more complex. Generally, the combination of errors that geometrical clamping error of fixing tool at the spindle of machining tool and the asynchronized error of driving mechanism causes that the run-out of tool reaches to 3$^{\sim}$20 times of the thickness of cutting chip. And also the run-out is occurred by the misalignment between axis of tool shank and axis of spindle and spindle bearing in high speed rotation. Generally, high speed machining is considered when the rotating speed is more than 8,000 rpm. At that time, the life time of tool is reduced to about 50% and the roughness of machining surface is worse as the run-out is increased to 10 micron. The life time of tool could be increased by making monitoring of tool-setup easy, quick and precise in high speed machining tool. This means the consumption of tool is much more reduced. And also it reduces the manufacturing cost and increases the productivity by reducing the tool-setup time of operator. In this study, in order to establish the concept of tool-setup monitoring the measuring method of the geometrical error of tool system is studied when the spindle is stopped. And also the measuring method of run-out, dynamic error of tool system, is studied when the spindle is rotated in 8,000${\sim}$60,000 rpm. The dynamic phenomena of tool-setup are analyzed by implementing the monitoring system of rotating tool system and the non-contact measuring system of micro displacement in high speed.

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Evaluation on Shape Machining of Dies and Molds in High speed Machining using Ball-End Milling (볼 엔드밀을 이용한 고속가공에서 금형제품의 형성가공 특성파악)

  • 김경균;강명창;김정석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.143-146
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    • 1995
  • Due to the recent growth of die/mold machining industry, demands for the high-precision and the high0quality of die product are increasing rapidly. Free surfaces of die/mold are often manufactured using the ball-end milling process. It is difficult to find the cutting condition of the ball-end milling process due to the free form machining for the various tool paths on inclined surface.

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Micro End-Mill Machining Characters and its Applications (마이크로 앤드밀의 가공특성분석 및 응용가공 연구)

  • Jae, Tae-Jin;Lee, Eung-Sook;Choi, Doo-Sun;Hong, Sung-Min;Lee, Jong-Chan;Choi, Hwan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.589-592
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    • 2003
  • In the machining process of micros shape by using high-precision machining system and micro end-mill, it is important for machining characters of tools to be grasped in order to stably use tools of micro end-mill. In this study. we carried out an analytical experiment of basic machining features by using end-mill tools for the purpose of damage prevention and manufacture of high quality when the tools of micro end-mill are used. This experiment used a micro machining system with high precision and a variety of end-mill tools commercialized from tens to hundreds microns in diameter. To establish an optimal machining condition without tool damage, cutting force was analyzed according to the changes of tool diameter and cutting conditions such as cutting speed. feed rate, depth of cut. And an examination was performed for the shape and surface illumination of machining surface according to the changes of machining conditions. Based on these micro machining conditions, micro square pillar, cylinder shaft. thin wall with high aspect ratio, and micro 3-D structures such as micro gear and fan were manufactured.

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Tool-Setup Measurement Technology of High Speed Precision Machining Tool (고속 정밀 가공기의 공구셋업 측정기술)

  • 박경택;신영재;강병수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.1066-1069
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    • 2004
  • Recently the monitoring system of tool setup in high speed precision machining tool is required for manufacturing products that have highly complex and small shape, high precision and high function. It is very important to reduce time to setup tool in order to improve the machining precision and productivity and to protect the breakage of cutting tool as the shape of product is smaller and more complex. Generally, the combination of errors that geometrical clamping error of fixing tool at the spindle of machining center and the asynchronized error of driving mechanism causes that the run-out of tool reaches to 3∼20 times of the thickness of cutting chip. And also the run-out is occurred by the misalignment between axis of tool shank and axis of spindle and spindle bearing in high speed rotation. Generally, high speed machining is considered when the rotating speed is more than 8,000 rpm. At that time, the life time of tool is reduced to about 50% and the roughness of machining surface is worse as the run-out is increased to 10 micron. The life time of tool could be increased by making monitoring of tool-setting easy, quick and precise in high speed machining center. This means the consumption of tool is much more reduced. And also it reduces the manufacturing cost and increases the productivity by reducing the tool-setup time of operator. In this study, in order to establish the concept of tool-setting monitoring the measuring method of the geometrical error of tool system is studied when the spindle is stopped. And also the measuring method of run-out, dynamic error of tool system, is studied when the spindle is rotated in 8,000 ∼ 60,000 rpm. The dynamic phenomena of tool-setup is analyzed by implementing the monitoring system of rotating tool system and the noncontact measuring system of micro displacement in high speed.

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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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Study on the High-Speed Machining Using High Speed Tooling System in Machining Center (범용 머시닝센터에서 주축증속기를 이용한 고속절삭에 관한 연구 -주축의 회전정도(Run-Out)가 가공특성에 미치는 영향 -)

  • 김경균;이용철;이득우;김정석;황경현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.41-45
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    • 1996
  • In order to realize the high-speed machining, the relative technologies for high speed machining tool and high speed machining are required now, The machining accuracy is influenced on the disturbance by the synchronized working conditions(cutting force, spindle Run-out, thermal deformation etc.) In this paper, the effect of spindle Run-out for the high speed machining is investigated. The results show that the spindle Run-out has a great influence on the machining accuracy in high speed machining.

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Die and Mold Making for Connecting Rod Parts through High Speed Machining (고속가공을 통한 커넥팅 로드용 금형 가공)

  • 임유업;김정석;강명창;이득우;정융호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.926-929
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    • 2000
  • Recently, there are lots of applications in machining dies using CAD/CAM systems. which results in reduction of machining time and rising of machining efficiency applying high speed machining and high quality machining. Investigation of machinability is necessary in order to apply high speed machining. In machining complicate 3D model such as connecting rod die. the need of high speed machine and coated tool is requested recently in this field. This paper introduce the database of high speed machining to improve machining efficiency of connecting rod die.

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