• Title/Summary/Keyword: 부등각 엔드밀

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Experimental Evaluation on Machining Errors in Milling with Different Helix Angle End Mills (밀링에서 부등각 엔드밀의 가공오차에 관한 실험적 고찰)

  • Kim, Won-Il;Lee, Hwa-Soo;Lee, Sang-Bok
    • Journal of the Korean Society of Industry Convergence
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    • v.4 no.3
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    • pp.257-261
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    • 2001
  • 이 연구는 밀링가공시 체터진동을 억제하기 위하여 부등각 앤드밀(나선각이 서로 다른 앤드밀)을 사용하여 절삭가공을 수행 한 후, 그 가공특성을 고찰한 것으로 가공표면의 기하학적 오차를 일반적으로 사용하는 등각 엔드밀에 의한 값과 실험에 의해 비교 검토한 결과, 두 엔드밀 모두 가공표면의 기하학적 오차는 유사함 나타내고 있으나, 부등각 엔드밀의 절대오차는 등각 엔드밀 보다 더 적은 경향을 나타내고 있다. 이들의 오차는 상향절삭보다 하야절삭 가공했을 때가 더 큰 것으로 나타났다. 더구나, 등각 엔드밀과 부등각 엔드밀과의 절대오차가 다르게 나타난 것은 밀링가공시 사용한 절삭날 인선에 의하여 완전히 의존되어지며, 또한 다른 나선각에 의해 기인된 각각의 절삭날에 대한 절삭날당 이송비의 변화에 의한 원인이라는 것을 명백히 알 수 있었다.

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An Evaluation on Cutting Characteristics in Milling Process with Different Helix Angle Endmills (밀링가공에서 부등각 엔드밀의 절삭특성 평가)

  • 이상복;김원일;왕덕현;김실경
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.6
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    • pp.1-7
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    • 2003
  • The experimental research was conducted to find an end mill with an ideal helix angle, which has a superior anti-vibration effect and a low machining tolerance. A conventional endmill which all low blades are $30^{\circ}$ helix angles and a different helix angle endmill which the opposite two blades are $30^{\circ}$ and the other opposites are different helix angles were studied. The cutting farce, machining tolerance and surface roughness were obtained. The AE signals appeared to have low values in up-milling rather than in down-milling. These are also appeared to have low values at low spindle revolutions rates. The cutting force values of Fxy and Fxyz were found to be increased according to the value of helix angle. In up-milling, it was difficult to find a definite tendency in machining tolerance, but in down-milling machining tolerance of the different helix angle end mill was found to be lower than that of the convention end mill. There is a definite tendency that the surface roughness gets better as the RPM increases. In down-milling, Type A($25^{\circ}$$30^{\circ}$) appeared to bring the most satisfactory result.

Aa Evaluation on Cutting Characteristics in Milling process with Different Helix Angle Endmills (밀링가공에서 부등각 엔드밀의 절삭특성에 관한 고찰)

  • 이상복;김원일;왕덕현;김실경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.196-201
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    • 2003
  • The experimental research was conducted to find an end mill with an ideal helix angle, which has a superior anti-vibration effect and a low machining-tolerance. A conventional endmill which all four blades are $30^\circ$ helix angles and a different helix angle endmill which the opposite two blades are $30^\circ$ and the other opposites are different helix angles were studied. The cutting force, machining tolerance and surface roughness were obtained. The AE signals appeared to have low values in up-milling rather than in down-milling. These are also appeared to have low values at low spindle revolutions rates. The cutting force values of Fxy and Fxyz were found to be increased according to the value of helix angle. In up-milling, it was difficult to find a definite tendency in machining tolerance, but in down-milling, machining tolerance of the different helix angle end mill was found to be lower than that of the convention end mill. There is a definite tendency that the surface roughness gets better as the RPM increases. In down-milling, Type $A(25^\circ+30^\circ)$ appeared to bring the most satisfactory result.

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Behaviors of Cutting Force and Acoustic Emission in Different Helix Angle Endmilling (부등각 엔드밀 가공시 절살력과 음향방출 신호 거동)

  • Kim, Wom Il;Wang, Duck Hyun;Kim, Young Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.15-22
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    • 2002
  • This study shows how the change of helix angle of different helix angle end mill affects machining accurracy. It was verified that cutting force are remarkably low when endmill has helix angle of different helix angle 250, 310, 370 and AE signal have less reationshap with the change of helix angle. Moreover, as the number of rotations are increases, the AE signal increased with the proportion to the number but cutting force are inversely proportional to the rotation.

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A study on the behaviors of acoustic emission and cutting force signals in different helix angle endmillingz (부등각 엔드밀 가공시 음향방출신호와 절삭력 거동에 관한 연구)

  • 김영수;김원일;이윤경;왕덕현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.239-244
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    • 2002
  • This study shows how the change of helix angle for different helix angle end mill affects machining accuracy. It was verified that cutting forces are remarkably low when endmill has helix angle of different helix angle $25^{\circ}\;, \; 31^{\circ}\; , \; 37^{\circ}$and AE signals have less relationship with the chance of helix angle Moreover, as the number of rotations are increased, the AE signals are increased with the proportion to the number but cutting forces are inversely proportional to the rotation.

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