Asymmetric Multi-Step Drill Point for Resonance-Free Chip Evacuation
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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 cutting resistance and inefficient chip discharge, particularly at smaller diameter steps.
Innovation Solution
The design incorporates an asymmetric drill point arrangement with varying radial and axial distances between cutting tips, allowing for sequential and offset cutting, reducing resonance and improving 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 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 radial distances from the rotation axis at each step. Specifically, cutting edges are positioned at asymmetric radial distances, creating unequal cutting forces that prevent resonant vibrations while maintaining manufacturing feasibility through systematic asymmetric positioning.
2Force
If cutting edges are symmetrically distributed, then cutting forces are equal, but resonance with same frequency and period is generated
Solution Approach 1:
The patent breaks the symmetry of cutting force distribution by positioning cutting edges at different radial distances from the rotation axis. This asymmetric arrangement causes cutting edges to engage the workpiece at different radii, generating varying cutting forces that eliminate periodic resonance while distributing the cutting load more effectively.
3Manufacturing precision
If smaller diameter steps are used, then drilling precision is improved, but chip discharge becomes difficult due to narrow flutes
Solution Approach 1:
The patent addresses chip discharge difficulties by utilizing the axial dimension in addition to radial positioning. Cutting edges are positioned at different axial distances from the front tip, creating staggered engagement that opens up chip discharge paths along the axial direction, thereby improving chip evacuation from narrow flutes at smaller diameter steps.
4Object-affected harmful factors
If asymmetric drill point arrangement is used, then resonance is reduced and chip discharge is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by making specific modifications only where needed - asymmetric radial positioning of cutting edges at each step and selective axial offset positioning. This localized asymmetric arrangement targets the resonance problem at its source without requiring complete redesign of the entire drill structure, thereby limiting the increase in device complexity.
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.