밀링가공에서 부등각 엔드밀의 절삭특성에 관한 고찰 = An Evaluation on Cutting Characteristics in Milling Process with Different Helix Angle Endmills

다국어 초록 (Multilingual Abstract)

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˚ helix angles and a different helix angle endmill which the opposite two blades are 30˚ 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˚+ 30˚) appeared to bring the most satisfactory result.