Tip/chip type ball-end mil, and tip/chip material

摘要

Way it shows in Figure 1, as for ball blade 28of a throw away tip/chip 14 and 28b, in order for part to extend from the plate shaped section 26 in the board thickness direction of plate shaped section 26, with the twisted blade which curves smoothly it is provided, at the same time, because projection angle is inside the range of the 20 - the 40 , while maintaining the board thickness size t of plate shaped section 26 of throw away tip/chip 14 former same, ball blade 28a and 28b being made to extend largely according to projection angle, twist is enlarged. Because of this, while controlling the strength of the tool itself 12 which originates in the installation groove 20 and the decrease of rigidity or the substantial increase of the tip/chip material, twist of ball blade 28a and 28b becoming large, as it can improve sharpness more, wall thickness size of ball blade 28a and 28b (size of the board thickness direction in plate shaped section 26) becoming large, rigidity to improve, it reaches the point where you can obtain the cutting efficiency which is superior more.