SPADE DRILL BLADE AND COMBINED BLADE

Abstract: provide are a spade drill blade and a combined blade. the spade drill blade includes cutting surfaces, cutting grooves, rear cutting surfaces, secondary cutting surfaces, cutting edges, secondary edges, a chisel edge, and side edges. one or more micro strengthened stepping tables are integrally erected on the cutting surface and each intersect with the rear cutting surface to form a micro strengthened side cutting edge; and a protruding stepped cutting surface is integrally formed on an inner side of each micro strengthened stepping table and intersects with the rear cutting surface to form a stepped cutting edge. on a cutting surface of the combined blade, one or more micro strengthened stepping tables are integrally erected in an axial direction of a rotation center of the combined blade and each intersect with the rear cutting surface to form a micro strengthened side cutting edge.

Inventor(s): Shiqing LI

CPC Classification: B23B51/02 (Twist drills)

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