A multi-step drill bit

Abstract

This utility model discloses a multi-layer stepped drill bit, relating to the field of drilling tool technology. It includes a cutting body with multiple main cutting edges and multiple secondary cutting edges. The main cutting edges form the drill tip, and the secondary cutting edges form the drill cutting zone. The secondary cutting edges are spirally arranged, with chip removal grooves between adjacent secondary cutting edges. The secondary cutting edges have multiple steps, and the drill diameter gradually increases along the axial direction in the stepped area. Through the multi-layer stepped structure, the initial drilling and finishing zones are designed collaboratively, reducing the resistance to the material during machining layer by layer, optimizing geometric parameters, and simultaneously solving problems such as composite material delamination and bulging, surface tearing, burrs, and fiber pull-out.

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