• 제목/요약/키워드: 보링

검색결과 78건 처리시간 0.023초

고능률 방진 보링바 개발에 관한 연구 (A Study on the Development of High Efficiency Anti-Vibration Boring Bar)

  • 최춘규;이우영;최성주;이동주
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1995년도 추계학술대회 논문집
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    • pp.109-112
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    • 1995
  • This paper analyzes high efficiency anti-vibration boring bars which increase stability against chatter vibration in boring operations. Structural analysis and mathematical modeling with considering dynamic properties for three types of existing boring bars are performed to search for optimal design parameters. The purpose of this paper is to find out design parameters for high efficiency anti-vibration boring bar.

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드릴, 보링 공정복합형 스텝 커터의 개발 (A Study on the Development of a Step Cutter with Hybrid Process of Drilling and Boring)

  • 황종대;허윤녕;오지영;정윤교;조성림
    • 한국기계가공학회지
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    • 제7권3호
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    • pp.30-35
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    • 2008
  • As demands for being economical, precise drilling process is on the increase. Therefore, the objective of this study is to develop a step cutter that can be controllable through micro dimension and can be changed from separate manufacturing processes of drilling and boring into an integrated one. In order to attain this object the step cutter is designed with a 3D geometric modeling and the design could be modified easily by using parametric modeling methodology. Also, collision is not occurred during manufacturing process because of cutting simulation. The step cutter is assembled by parts made up of 5-axis machining and sintering. Validation tests are accomplished. They show that developed cutter has characteristics such as reduction of machining time as well as the good surface roughness of the machined hole. Indeed, reliability could be obtained from a durability test.

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AL6061-T4의 보링가공 시 절삭조건에 따른 직경 변화에 관한 연구 (A study on the Change of Diameter Based on Cutting Conditions in AL6061-T4 Boring Machining)

  • 천세호
    • 한국기계가공학회지
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    • 제19권6호
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    • pp.49-54
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    • 2020
  • The purpose of this study is to investigate the effects of the change in the spindle speed and the feed rate on the diameter change of a hole using a boring cutter for the internal boring process of AL6061-T4 alloys. The experimental results are quantitatively analyzed by applying the factor analysis and the response surface analysis of the experimental design method. The tendency of the diameter change according to the change in the spindle speed and feed level is also evaluated. During the internal boring process of AL6061-T4 alloys, the main factor affecting the diameter change is the spindle speed in which the diameter decreases as the number of revolutions increases. In addition, the diameter tends to increase as the feed is increased; however, as the number of spindle revolutions increases, the influence of the feed decreases.

복합재료 보링바의 동적 특성에 관한 연구 (A Study on the Dynamic Characteristics of the Composite Boring Bar)

  • 황희윤;김진국;이대길
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 춘계학술발표대회 논문집
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    • pp.206-210
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    • 2003
  • Machining of deep holes with conventional boring bars frequently induce chatter vibration because of their low dynamic stiffness which is defined as the product of static stiffness and damping of conventional boring bar materials. In addition, the specific stiffness ($E/{\rho}g$) of boring bars is more important than the static stiffness to increase the fundamental natural frequency of boring bars in high speed machining. Therefore, boring bar materials should have high static stiffness and high damping as well as high specific stiffness. The best way to meet requirements is to employ fiber reinforced composite materials for high speed boring bars because composite materials have high static stiffness, high damping and high specific stiffness compared to conventional boring bar materials. In this study, the dynamic characteristics of carbon fiber epoxy composite boring bars were investigated. From the metal cutting test, it was found that the chatter was not initiated up to the ratio of length to diameter of 10.7 at the rotating speed of 2,500 rpm.

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다구찌 방법을 이용한 보링바의 동강성 변동에 관한 연구 (Study on the dynamic stiffness variation of boring bar by Taguchi Method)

  • 천세호;고태조
    • 한국기계가공학회지
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    • 제8권3호
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    • pp.98-104
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    • 2009
  • The objective of this paper is to investigate the effect of factors on the dynamic stiffness variation of boring bar. The experiment was carried out by Taguchi Method and Orthogonal array table. The results indicate that overhang was found out to be dominant factor with 95% confident intervals and feed rate and depth of cut were insignificant. In addition, analysis of loss function shows that loss value increased sharply from 3D to 4D(D is a shank diameter). Consequently, there is critical point which changes property of dynamic stiffness.

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보링커터의 세장비에 따른 구멍 정밀도 변화에 관한 연구 (A Study on the Change in Hole Precision with Slenderness Ratio of Boring Cutter)

  • 천세호
    • 한국기계가공학회지
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    • 제16권5호
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    • pp.7-12
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    • 2017
  • It is assumed that the buckling and cutting conditions depending on the slenderness ratio will affect the machining quality of the rotary boring tool mounted on a milling machine. In this study, the boring cutter was designed and fabricated to precisely create the Ø30 hole. Through the performance evaluation, the accuracy of the hole according to the slenderness ratio and cutting conditions was analyzed, and the following conclusions were obtained. The higher the RPM, the smaller the change in the working diameter, and the smaller the hole. Next, the smaller the slenderness ratio, the smaller the change in straightness due to the change in cutting conditions. Finally, the slenderness ratio also affects the tendency for changes in the concentricity. The larger the slenderness ratio, the more sensitive the concentricity to changes in cutting conditions.