Drill Bit Tooth Geometry for Circular Boreholes and Stability
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Solution Overview
Problem
Existing drill designs for mining mineral materials face challenges in achieving a circular borehole while maintaining mechanical stability and efficient cutting edge performance, particularly in reinforced concrete.
Innovation Solution
The drill bit features a drill head with a helix and shank end, including radially projecting teeth on the blades that reduce contact area with the borehole wall, providing mechanical stability and ensuring a circular drill hole through a unique tooth and flank arrangement, with the tooth being significantly smaller than the blade and positioned in front of the flank for optimal impact and rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill head has a reduced height to minimize contact area with the borehole wall, then the drilling efficiency is improved, but the mechanical stability of the drill head deteriorates
Solution Approach 1:
The drill head is segmented into distinct functional components: cutting edges for material removal, blades for borehole wall contact and stability, and teeth for final shaping. This segmentation allows each component to be optimized independently - the blades can be longer for stability while the cutting edges remain compact for efficiency.
Solution Approach 2:
Different parts of the drill head have different local qualities and functions. The blades have a specific geometry with teeth positioned at optimized locations to provide both stability and efficient cutting. The cutting edges have specific rake angles and clearance faces tailored for material removal, while the blades provide structural support.
2Stability of the object's composition
If the drill head extends below the tooth to provide mechanical stability, then the mechanical stability is improved, but the contact area with the borehole wall increases
Solution Approach 1:
The drill head geometry is optimized dynamically - the blades extend below the teeth to provide stability during the drilling process, but the teeth are positioned to minimize unnecessary contact with the borehole wall. This dynamic geometric arrangement ensures stability when needed while minimizing friction and heat generation.
3Manufacturing precision
If the tooth has a substantial dimension to ensure a circular borehole, then the borehole quality is improved, but the contact area with the borehole wall increases
Solution Approach 1:
The teeth on the blades perform a preliminary action by pre-shaping the borehole wall before the final cutting edges complete the circular form. This preliminary action by the teeth ensures borehole circularity is achieved progressively, reducing the need for excessive tooth dimension while maintaining precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for efficient drilling of mineral materials, including reinforced concrete, by maintaining mechanical stability and ensuring a circular borehole while minimizing contact area, thus enhancing drilling performance and durability.
Implementation Method 1
a helix, a shank
Implementation Method 2
for receiving impacts along a striking direction
Implementation Method 3
cutting edges each have a rake face and a clearance face
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a drill for the removal of mineral materials, comprising a drill head (2), a coil (3), an insertion end (4) and an impact surface (7) arranged successively on a longitudinal axis (6), with said impact surface being arranged on an end face of the insertion end (4) facing away from the drill head (2) for receiving impacts along an impact direction (8). Th drill head (2) has at least two cutting edges (13) and at leas two blades (20). The cutting edges (13) each have a cutting surface (16) and a free surface (17). The blades (20) run parallel to the longitudinal axis (6) and border the cutting edges (13). The blades (20) each have a radially protruding peak (24), which borders the cutting surface (16) and does not or only partially borders the free surface (17). An axial dimension (29) of the peak (24) is less than an axial dimension (25) of the blade (20).