• Title/Summary/Keyword: high-speed spindle

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Analysis of Cutting Characteristics in High Speed Tapping (고속 탭핑에서의 절삭 특성 해석)

  • 강지웅;김용규;이돈진;김선호;김화영;안중환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.243-246
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    • 2000
  • Productivty of tapping has been increasing through the tcchnological advances in synchronization between spindle rotation and feed motion even in the high spindle speed. However, not much researches have been conducted about tapping process because its complicate cutting mechanism. In order ta investigate the characteristics of the tapping process, this paper concentrates on the analysis of curting torque behavior during one cycle of lapping. As one completc thread is performed through the whole chamfer ercuttlng, cutting torque increases highly in chamfer cutting, but smaothly in full thread cutting Functioning of the threads guide. Cutting torque in backward cutting is smaller than in Sorwerd cutting due to only friction farce in against between the tool and workpiece. And torque behavior of a periodic Sine ripple-mark was identified during one revolution of a tap.

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Experimental Investigation of Electric Gear for Speed Variation of High Speed Spindle Motor (고속 스핀들 모터의 속도 가변을 위한 전기기어의 실험적 접근)

  • Bahn, Ji-Hyoung;Lee, Ji-Young;Hong, Jung-Pyo;Lee, Geun-Ho
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1114-1116
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    • 2005
  • This paper introduces an electric gear to run a high speed spindle motor. Compared with inverter driving, electric gear can be used to reduce switching loss caused by using high switching frequency and improve heating problem on reactor with sinusoidal current wave form. In this paper advantages and disadvantages of electric gear are presented in comparison with those of inverter driving and mechanical gear, and its usefulness is verified by means of experimental approach.

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An Analysis of the Thermal Deformation of the Main Spindle for Small and Precision Lathe (소형 정밀 선반용 주축의 열 변형 해석)

  • Jian, Jin;Ko, Tae-Jo;Kim, Hee-Sool
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.6 no.1
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    • pp.43-49
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    • 2007
  • Multi-function and miniaturization of the medical equipment and tele-communication systems need small and high precision machined parts. For the economic machining of the small size workpiece it should be machined by small and high precision machine tools with high speed machining. The belt type driving system in turning lathe has a limitation of spindle speeds because of the vibrations from driving mechanism, built-in type of driving mechanism is used to reduce the vibration. However, the main spindle of the built-in motor is connected directly to the motor, so the heat generation of the motor and bearing makes bad influence of the accuracy of machine tools. In this study, the analysis of heat generation from motor and bearings supporting main spindle and experiment were carried out. The results of theoretical simulation of temperature and deformation of the main spindle are good agreement with those of measured.

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Development and Evaluation of Ultra High-Speed Tapping Machine (초고속 태핑머신 개발 및 평가)

  • 김선호;김동훈;김선민;이돈진;이선규;안중환;이상규
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.221-227
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    • 2002
  • Tapping is a machining process that makes a female screw on parts to be assembly together. Recently, as the number of small and compact products increases the radius of tap as small as 1 mm is not unusual and more accurate tapping is needed. In complying with those needs, some high-speed tapping machines with synchronizing function have been developed. This paper describes the development of an ultra high-speed tapping machine up to 10,000rpm. The key factors in the tapping speed are the acceleration/deceleration and the synchronizing errors between spindle motor and fred motor. To minimize the acceleration/deceleration time, a low inertia spindle with a synchronous built-in servo motor was developed. To minimize the synchronizing errors, the tapping cycle algorithm was optimized on an open architecture CNC. The developed tapping machine has the acceleration/deceleration time of 0.13sec/10,000rpm for rigid tapping and the synchronizing error below 4.4%. The cycle time for tapping a female screw of M3 and depth 2 times diameter was 0.55sec.