Drill Bit Asymmetric Cutting Edge Layout for Aluminum Vibration
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Solution Overview
Problem
Existing drilling tools for long-chipping materials like aluminum experience high vibration and inefficient chip removal during machining, leading to slower processing and potential damage to the workpiece.
Innovation Solution
A drilling tool with cutting edges made of ultra-hard materials distributed at uneven angular intervals around the circumference, featuring chip breakers and a coolant system to facilitate fast and low-vibration machining, allowing for reliable chip removal and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting edges are distributed at uniform angular intervals around the circumference, then the machining process is stable, but chip removal becomes inefficient and vibrations increase
Solution Approach 1:
The patent applies asymmetry by distributing cutting edges at non-uniform angular intervals around the circumference of the drilling tool. Specifically, the cutting edges are positioned at different angular spacings (e.g., 0°, 120°, 240° for three cutting edges, or other asymmetric distributions), which creates an asymmetric cutting pattern that prevents periodic vibration and improves chip evacuation efficiency compared to uniform distribution.
2Productivity
If multiple cutting edges are used to increase productivity, then machining speed improves, but chip removal becomes more difficult
Solution Approach 1:
The asymmetric distribution of multiple cutting edges creates varying chip flow paths and angles, which prevents chip entanglement and facilitates natural chip evacuation. This asymmetric arrangement allows multiple cutting edges to work simultaneously while maintaining effective chip removal without requiring additional complex chip evacuation mechanisms.
3Strength
If ultra-hard material is used for cutting edges, then wear resistance improves, but chip breaker formation becomes more difficult
Solution Approach 1:
The patent replaces traditional mechanical chip breaker formation methods (such as machining or pressing) with laser processing technology. The laser beam can precisely remove material from ultra-hard coatings to form chip breakers without requiring mechanical contact, thus overcoming the difficulty of forming chip breakers in hard materials while maintaining the wear resistance benefits of ultra-hard coatings.
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 tool achieves a fast and low-vibration machining process with reliable chip removal and reduced wear, enabling efficient production of complex bore geometries in long-chipping materials without additional guide surfaces.
Implementation Method 1
the cutting edges can be reliably cooled, thus enabling fast and low-wear machining
Implementation Method 2
the chip breaker can be formed in the ultra-hard material by laser processing
Data Source
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AI summary
A drilling tool (1) for producing a bore in a workpiece is provided, which has a main body (2) and at least a first plurality (3a) of lips (3) made of ultrahard material, which, in order to form a predetermined first bore diameter, are fastened to associated seats in a manner distributed around the circumference of the main body (2). The lips (3) are distributed around the circumference of the drilling tool (1) at irregular angular spacings (ß, β-Δ3, ß+Δ4) and each have at least one cutting edge and at least one rake-face-side chip breaker (37) introduced into the ultrahard material and formed as a depression in the ultrahard material.