UNILATERAL CUTTING DRILL AND METHODS OF ITS MANUFACTURE (VARIANTS) Russian patent published in 1998 - IPC

FIELD: mechanical engineering. SUBSTANCE: drill has stem in the form of profiled shaped tube with internal channel for feeding the cutting fluid and external V-shaped channel for removal of chips. Drill has also drilling head. Its wall of V-shaped channel adjacent to cutting plate has longitudinal projection spaced from cutting plate and conjugated with its front surface of other circumference. Projection height is 1.0-1.5 mm higher than radius of the above-indicated circumference. Projection is obtained by coupling the rod to adjacent walls of external V-shaped channel of drilling head. In normal section, rod is of quadrangle shape with subsequent machining. Projection may also be obtained by fusing of layer of wear-resistant material with subsequent machining. EFFECT: more effective construction. 10 cl, 6 dwg