| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: drill comprises a cutting part and a tail part, where there is a polyhedral side surface at the side of the cutting part with a cross section in the form of a polygon that is symmetrical relative to the drill axis. In order to increase manufacturability of a drill and a cartridge, at the end of the tail part opposite to the cutting part there is a cylindrical section limited with a conical surface, the top of which faces the cutting part. At the same time the diameter of the cylindrical section is less than the diameter of the circumference included into the specified polygon of cross section of the polyhedral side surface of the tail part. The cartridge comprises a body with a part for fixation in the machine or electric tool, a bushing with a polyhedral hole, a bush made of elastic material and having a cylindrical hole, diameter of which is less than the diameter of the cylindrical section on the tail part of the drill, and a stop. At the same time in the body there is a longitudinal hole, where at the side of the end facing the cutting part of the drill there is a bushing installed and rigidly fixed with a polyhedral opening, at a distance from which there is a stop, and between the stop and the bushing with the polyhedral opening there is a bushing installed of elastic material with the possibility to interact with the cylindrical section at the tail part of the drill and the limiting conical surface. ^ EFFECT: increased manufacturability of drill and cartridge. ^ 2 cl, 4 dwg |
