Asymmetric Multi-Step Drill Point for Resonance-Free Chip Discharge
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Solution Overview
Problem
Existing multi-tip drilling parts with symmetrically distributed cutting edges experience resonance due to equal cutting forces, leading to high resistance and inefficient chip discharge, particularly at smaller diameters.
Innovation Solution
The drill point arrangement features asymmetrically positioned cutting tips with varying radial and axial distances, allowing for sequential engagement and reducing cutting resonance, enhancing chip discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting edges are symmetrically distributed at each step, then the structure is simple and easy to manufacture, but cutting resonance occurs due to equal cutting forces and high cutting resistance is generated
Solution Approach 1:
The patent applies asymmetry by distributing cutting edges with different angular intervals around the drill axis. Specifically, cutting edges are arranged at non-uniform angular positions (e.g., 0°, 90°, 180°, 270° for four edges) rather than symmetric uniform distribution, which breaks the periodicity of cutting forces and eliminates resonance while maintaining manufacturing simplicity
Solution Approach 2:
The patent changes the angular interval parameter between cutting edges from uniform to non-uniform distribution. By varying the angular positions of cutting edges at different steps, the cutting force frequency is modulated to avoid resonant frequencies, reducing vibration and improving drilling performance
2Ease of manufacture
If cutting edges are symmetrically distributed at each step, then the structure is simple, but large cutting resistance is generated
Solution Approach 1:
The asymmetric angular distribution of cutting edges creates varying cutting depths and force vectors during rotation, which distributes the cutting resistance more evenly over time and reduces peak forces, thereby lowering overall cutting resistance while keeping the structure simple
Solution Approach 2:
The patent uses periodic variation in cutting edge engagement through asymmetric arrangement, where cutting edges engage the workpiece at different phases of rotation. This periodic action with varied timing reduces continuous cutting resistance by allowing intermittent engagement patterns
3Volume of moving object
If chip discharging flute is narrow at smaller diameter steps, then the drill structure is compact, but chip discharge is not efficient
Solution Approach 1:
The patent segments the chip discharge function by providing multiple chip discharging flutes (at least two) around the drill body. This segmentation increases the total chip discharge capacity despite each individual flute being narrow, as chips can exit through multiple parallel pathways simultaneously
Solution Approach 2:
The patent applies local quality by optimizing flute characteristics at different locations. Narrow flutes are used where space is constrained, but the asymmetric cutting edge arrangement creates varied chip load distribution that prevents clogging, maintaining efficient chip discharge throughout the flute length
Data Source
AI summary
The present drill point arrangement includes a first and second land defined by a first and second flute, with a first cutting tip and a second cutting tip formed on the first and second lands respectively. The first cutting tip being positioned a first radial distance and the second cutting tip being positioned a second radial distance, each measured from the axis of rotation. The second cutting tip is positioned next in cutting tip sequence to the first cutting tip, and the second radial distance of the second cutting tip is greater than the first radial distance of the first cutting tip. Optionally, the first cutting tip is positioned a first axial distance and the second cutting tip is positioned a second axial distance, each measured from the front tip, and the second axial distance is greater than the first axial distance.