一种可减少钻孔毛刺的复合钻头
By using a composite drill bit design, with two sets of drilling components and staggered diamond and triangular cutting blades, the problems of drilling burrs and drill bit runout are solved, achieving efficient and precise drilling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LINGYUN INDAL CORP
- Filing Date
- 2025-06-06
- Publication Date
- 2026-07-17
AI Technical Summary
Burrs generated during drilling affect product quality and processing efficiency, and traditional drill bits are prone to bounce, resulting in low precision, which increases the deburring process and cost.
The composite drill bit design includes a first drilling assembly at the head for rough cutting and a second drilling assembly on the side for fine cutting. The pre-drilled hole diameter is smaller than the actual hole diameter. The two sets of drilling assemblies reduce burrs and stabilize the drill bit. The diamond-shaped and triangular inserts are installed in a staggered manner to increase the overlap of the cutting edges. Chip removal grooves and water holes are provided for cooling.
It effectively reduces drilling burrs, improves drilling accuracy and tool life, reduces drill runout and wear, and enhances processing efficiency and precision.
Smart Images
Figure CN224508527U_ABST
Abstract
Claims
1. A composite drill bit capable of reducing burrs in a drilled hole, characterized by, It includes a drill bit body (1) and a first drilling assembly and a second drilling assembly disposed thereon; the first drilling assembly is disposed at the head of the drill bit body (1) to perform rough cutting on the machined hole to form a pre-drilled hole, the diameter d2 of the pre-drilled hole is smaller than the actual diameter d1; The second drilling assembly is located on the side of the drill bit body (1) and performs fine cutting on the basis of the pre-drilled hole, while removing burrs on the drilling in and drilling out sides of the pre-drilled hole.
2. The composite drill bit of claim 1, wherein, The first drilling assembly includes a first blade (2) and a second blade (3) with the same structure; the first blade (2) is a triangular cutting blade with three cutting edges; the head of the drill bit body (1) is provided with a front mounting groove that matches the first blade (2) and the second blade (3); the first blade (2) and the second blade (3) are respectively installed in the front mounting groove.
3. The composite drill bit of claim 1, wherein, The first blade (2) and the second blade (3) are installed in a staggered manner. The first blade (2) is located on the outer side of the drill bit body (1) in the radial direction. Its cutting range is the outer annular area of the pre-drilled hole. The relationship between its minimum cutting radius r1, maximum cutting radius r2 and the diameter d2 of the pre-drilled hole is r1≤d2 / 4 and r2=d2 / 2. The second blade (3) is located on the inner side of the drill bit body (1) in the radial direction. Its cutting range is the circular area covering the axis of the pre-drilled hole. The relationship between its maximum cutting radius r3 and r1 is r3>r1.
4. The composite drill bit of claim 1, wherein, The second drilling assembly includes a third blade (4) and a fourth blade (5); the third blade (4) and the fourth blade (5) have the same structure and are rhomboid blades; a central mounting groove matching the third blade (4) and the fourth blade (5) is provided on the side of the drill bit body (1), and there are two central mounting grooves, which are symmetrically arranged along the axis of the drill bit body (1).
5. The composite drill bit of claim 1, wherein the pre The relationship between the borehole diameter d2 and the actual borehole diameter d1 is that d1-d2 is between 0.8-1.5mm.
6. The composite drill bit of claim 1, wherein, The drill bit body (1) is provided with a chip removal groove.
7. The composite drill bit of claim 1, wherein, The distance d3 between the front end of the central mounting slot and the deepest part of the front mounting slot is related to d2 by d3 / d2≥0.25, or d3 is ≥5mm.
8. The composite drill bit of claim 1, wherein, A water hole (1-1) is provided in the center of the drill bit body (1), and the water outlet of the water hole (1-1) is located at the head of the drill bit body (1).