• Title/Summary/Keyword: Burnishing Drill

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The influence of Guide Pads in the High Precision Cutting Process of Burnishing Drill (고정밀 가공을 위한 Bunishing Drill의 Guide Pad 영향)

  • 김종성
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.80-84
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    • 1996
  • The effects of guide pads on burnishing action and accuracy of machined hole are investigated in drilling with burnishing drill using a speciaaly designed tool experimentally. The cutting forces are balanced at the small forward regions of guide pads. The burnishing action takes place under a high contact pressure between the bore wall and those regions. The over size mechanism of machined hole by the guide pads is discussed.

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A Study on the Fabrication and Evaluation of Burnishing Drills for Aluminum Hole Making (알루미늄 홀 가공용 버니싱 드릴의 제작 및 평가에 관한 연구)

  • Ha, Jeong-Ho;Kim, Dong-Gyu;Sa, Min-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.21 no.7
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    • pp.53-63
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    • 2022
  • Recently, the use of aluminum components in the reduction of the vehicle weight to improve fuel efficiency and reduce carbon dioxide emissions has increased. In the aluminum machining cutting process, hole-making is an important process that accounts for 30% of the machining process. Although many studies have been conducted using the continuously advancing hole processing technology, studies on the machinability of the tool depending on the type of chuck on the workpiece are still lacking. In this study, the machining performance of cemented carbide burnishing drills was compared and analyzed according to chuck type. The burnishing drill was used to create a hole in the AL6061 workpiece, and the surface roughness and dimensional accuracy of the hole were examined according to the type of chuck while monitoring the spindle load.

A Study on Cutting Performance of the BTA Drilling (BTA드릴가공의 절삭성능에 관한 연구)

  • 장성규;김순경;전언찬
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.65-72
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    • 1998
  • The BTA drilling chip is better for deep hole drilling than other self-piloting with pad drilling chips because the large length to diameter ratio allows a unique cutting force dispersion and better supplies the high pressure fluid. Therefore the BTA is useful for many tasks, such as coolant hole drilling of large scale dies, as well as tube seat drilling, which is essential for the heat exchanger, and variable component drilling for automobiles. Deep hole drilling has several significant problems, such as hole deviation, hole over-size, circularity, straightness, and surface roughness. The reasons for these problems, which often result in quality short comings, are an alignment of the BTA drilling system and the unbalance of cutting force by work piece and tool shape. This paper analyzes the properties through an experiment which com¬pared single-edge BTA drills with multiple-edge BTA drills, as well as the shapes of the tools to cause an unbalance of cutting force, and its effect on the precision of the worked hole. Conclusions are as follows. 1) In SMSSC drilling, 60m/min of BTA with single and multi-edged tools proved the best cutting condition and the lowest wear character. 2) The roundness got a little worse as cutting speed was increased, but surface roughness was hot affected. 3) It was proved that the burnishing torque of both drills approached 26%. which is almost the same as the 24% insisted on by Griffiths, and the dispersion characteristic of the multi-edged BTA drill proved better than the single-edge BTA drill.

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A Study on the Charactdristics of CNC Deep Hole Maching for Marine Part Materials with the Sintered Carbide Gun Drill (초경합금 Gun Drill에 의한 박용 부품 재료의 CNC 심공가공 특성에 관한 연구)

  • 전태옥;심성보
    • Journal of Advanced Marine Engineering and Technology
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    • v.18 no.2
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    • pp.64-74
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    • 1994
  • The gundrill is capable of machining for having large length to diameter ratio in single pass. The techniques of gundrill and gun boring began developing in the late 18th century with the need for more accurate bores in rifle, cannon, machinery part and marine part etc. The main feature of the gun drilling provides a stabilizing cutting force resultant necessary for self guidance of the drill head. A study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process. The thesis deals with the experimental results obtained during gun drilling on marine part materials for different machining conditions.

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