FIELD: mining.
SUBSTANCE: bore bit blade insert comprises an insert body, blade and rear edge. The rear edge of the plate is made on the surface ensuring blade sharpening from its outer rim to the inside rim decreasing in such a way that the angle between the insert rear edge and the blade points guidepath line remains constant.
EFFECT: possibility of the insert rear edge contact during its interaction with the rock is excluded and provided rock free cutting process along the entire blade insert length.
1 dwg
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