• 제목/요약/키워드: Helical-feed drilling

검색결과 3건 처리시간 0.015초

볼엔드밀 공구의 헬리컬 운동을 이용한 구멍가공 특성 (Drilling Characteristics Using the Helical Motion of Ball End Mill Tools)

  • 김근오;박규열
    • 한국정밀공학회지
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    • 제15권6호
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    • pp.40-47
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    • 1998
  • Drilling is an indispensable process in manufacturing of the die and mould and the other mechanical parts which needs high dimensional and surface accuracy. In this paper, a new type of drilling method was proposed in order to improve both processing efficiency and accuracy. Specifically, the helical motion using ball end mill tools, instead of normal drilling method, was applied to perform an effective hole machining. In this paper, an theoretical background of the new type of drilling method was established, and the feasibility of the proposed theory was proved by experiments, where proposed drilling process in the paper gave a different machining specification than general method did.

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탄소섬유강화 플라스틱의 고정도, 고능률 드릴링 가공 (Highly Precise and Efficient Drilling of Carbon Fiber Reinforced Plastics)

  • 박규열;최진호;이대길
    • 대한기계학회논문집
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    • 제18권12호
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    • pp.3175-3184
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    • 1994
  • The high strength and wear-resistant metal bonded diamond wheel was applied to the drilling process of carbon fiber reinforced plastics (CFRP), The helical-feed drilling method was use for the first time to overcome the limit of drilling depth of the conventional drilling process and to improve the dressing of the wheel. The helical-feed drilling method was found effective at high cutting speed without the limit of drilling depth.

드릴의 선단각, 나선각 및 가공조건이 가공성에 미치는 영향 (The Effect of Drill Helix Angle, Point angle, and Cutting Conditions on the Drilling Performance)

  • 이영식
    • 한국생산제조학회지
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    • 제6권4호
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    • pp.138-146
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    • 1997
  • The optimal drill helix angle, point angle, and cutting conditions are recommended in the study so as to maximize the drilling performance by investigating the experimental reaults concerning with the state of chip formation, roundness of machined holes, and geometry of projected burr at hole exit, which are examined under the conditions of various helix angles, drill point angles of twist drill, cutting speeds, and feeds in operional parameters. In the easiness of chip escape, the helical type of chip is producted when a helix angle is 30$^{\circ}$, drill point angle 118$^{\circ}$, 140$^{\circ}$and feed is st between 0.1 and 0.15mm/rev. Roundness of machined hole is improved when the helix angle is 37$^{\circ}$, drill point angle is 118$^{\circ}$, and feed is 0.15mm/rev. The height of projected burr at the button of machined hole increases when the drill point angle and helix angle becomes large.

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