Deep Hole Drilling by Using Periodical Change of Feedrate

주기적 이송속도 변화를 이용한 심공드릴가공

  • 왕덕현 (경남대학교 기계자동화공학부) ;
  • 이윤경 (경남대학교 기계자동화공학부) ;
  • 김원일 (경남대학교 기계자동화공학부) ;
  • 김용제 (경남대학교 대학원 기계공학과)
  • Published : 2000.12.01

Abstract

Experimental study of drilling for duralumin A2024 was conducted with intermittently accelerated and decelerated feedrate. It is achieved through a programmed periodic increase and decrease in the feedrate using a machining center. The following experimental results were performed with the objective of solving chip to disposal problems. In conventional drilling of aluminum, long continuous chips are produced with winding around the drill and causing difficulties in eliminating chips from the cutting zone. In order to acquire the basic data necessary to regulate the chip profile, the relationship between cutting variables and chip shape was investigate. The following conclusions are established from the experimental results. At a suitable feed fluctuation ratio, intermittently decelerated feed drilling proved successful in braking chips to appropriate lengths while maintaining stable cutting. Thus, it is an effective method for improving chip disposal. The amplitude of the dynamic component of cutting force in intermittent feed drilling is influenced by the feed fluctuation ratio.

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References

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