| 摘要 |
FIELD: mechanics. ^ SUBSTANCE: proposed attachment comprises peripheral and other cutting plates arranged at different distance from the drill axis, two guide plates fitted on the head edges. Note that one of the guide plates is arranged right opposite the peripheral cutting plate, while the second one makes a central angle with the first one directed towards rotation and the cutting plates on one side of the head axis are at an angle to the cutting plates on the other side. The central angle between the guide plates is selected to make 100-110.The total length of cutting edges arranged on the peripheral plate side and the total length of cutting edges of the blades arranged on the opposite side are interrelated and related to the angle. The position of the cutting plates on one side of the head relative to the other side are selected proceeding from cited relationships, while angle alpha is taken to make 10 to 25. ^ EFFECT: reduced wear of cutting and guide plates, higher accuracy of drilling. ^ 3 dwg |
