Drill Head Conical Intermediate Area Centering
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Solution Overview
Problem
Drilling tools face challenges in achieving precise centering at the start of the drilling process due to the lack of cutting action at the tip, leading to radial displacement of the drill.
Innovation Solution
A drill head design featuring a conically expanding intermediate area that connects the central and outer cutting edges, providing an inclination angle for automatic centering by engaging with the workpiece and generating radial material removal forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the intermediate area tapers conically down to the rearward outer area (conventional design), then a clearance is achieved in the region of the intermediate area during drilling, but the centering effect at the start of the drilling process is insufficient
Solution Approach 1:
The patent inverts the conventional tapering design by making the intermediate area expand conically from the central area toward the outer area, with the cone apex at the central area. This inversion transforms the intermediate area from a clearance-providing surface to a centering surface that engages the workpiece and generates radial material removal forces for automatic centering.
Solution Approach 2:
The patent changes the geometric parameters of the intermediate area from a tapering configuration to an expanding conical configuration with a specific inclination angle between 3° and 15° relative to the rotational axis. This parameter change enables the intermediate area to function as a centering element while maintaining clearance benefits.
2Manufacturing precision
If the intermediate area is designed to expand conically from the central area, then automatic centering is achieved through radial material removal forces, but the structural complexity increases
Solution Approach 1:
The drill head is segmented into three distinct functional areas: a central area with first main cutting edges, an intermediate area with intermediate cutting edges that expands conically, and an outer area with second main cutting edges. This segmentation allows each area to perform its specific function while maintaining overall structural coherence.
Solution Approach 2:
The intermediate area serves multiple functions: it connects the central and outer areas structurally, provides automatic centering through its conical expansion, and performs material removal through intermediate cutting edges. This multi-functionality reduces the need for separate centering devices.
3Manufacturing precision
If the intermediate area expands at a steep inclination angle, then centering effect is improved, but the axial length increases
Solution Approach 1:
The patent optimizes the inclination angle of the conical expansion to a specific range of 3° to 15° relative to the rotational axis. This parameter optimization balances the centering effect with the axial length constraint, ensuring effective centering while maintaining a compact drill head design.
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
The conical design ensures effective centering of the drill during the drilling process by uniformly applying material removal forces in the radial direction, ensuring precise alignment and preventing radial displacement.
Implementation Method 1
first main cutting edges that extend up to a first radius; and that furthermore has an outer area offset back in the axial direction relative to the central area, with second main cutting edges which extend up to a second outer radius
Data Source
AI summary
The drill head (2) extends along a rotational axis (24) in the axial direction (22) and has a central area (6) on the front with first main cutting edges (26), an intermediate area (8) connecting thereto, and an outer area (10) in turn connecting thereto with second main cutting edges (30). The intermediate area (8) in this case expands in the axial direction (22) toward the outer area (10) and in particular forms an expanding conical shell. A centering effect is hereby achieved via the intermediate area (8).