HARD-ALLOY INSERT FOR ROCK-CUTTING TOOL Russian patent published in 1997 - IPC

FIELD: mining. SUBSTANCE: hard- alloy insert for rock-cutting tool has shank and cutting part with side cutting edges and with main cutting edge. The latter is formed by intersection of rear face of convex shape with front face. Front face of cutting part is formed by central section of convex shape and by two side sections of flat shape. Each side cutting edge is formed by intersection of corresponding side sections of front face with rear face. Side sections of front face are located symmetrically relative to central section and conjugated with the latter by lines. Conjugation lines are located at some angle whose vertex is oriented in direction to shank. Shank has shape of cylinder of revolution. EFFECT: higher efficiency. 7 cl, 4 dwg