Asymmetric Drill Tip Design for Chatter Reduction
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Solution Overview
Problem
Symmetrical drill configurations lead to increased vibrations and chatter marks during drilling, particularly in longer holes, due to symmetry-induced vibrations, making them difficult to manufacture and maintain precision.
Innovation Solution
A drill tip with an asymmetrical configuration in the cutting-edge region that transitions into a symmetrical configuration along the axis, limiting asymmetry to a minimal region near the drill tip, allowing for standard symmetrical manufacturing methods and even chip discharge, while preventing chatter by reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a symmetrical drill configuration is used, then manufacturing is simpler and more cost-effective, but vibrations and chatter marks increase during drilling operations
Solution Approach 1:
The patent applies local quality by making only the cutting-edge region asymmetrical while keeping the remaining axial length symmetrical. This localized asymmetry in the cutting-edge region prevents vibrations and chatter marks, while the symmetrical portion maintains manufacturing simplicity and even chip discharge.
Solution Approach 2:
The patent applies asymmetry by configuring the cutting-edge region asymmetrically relative to the drill axis, specifically with unequal helix angles or unequal clearance angles for the two cutting edges. This asymmetry disrupts the symmetry-induced vibrations that cause chatter marks in conventional symmetrical drills.
2Object-generated harmful factors
If an asymmetrical drill configuration is used, then vibrations and chatter marks are reduced, but manufacturing complexity and production resources increase
Solution Approach 1:
The patent reduces manufacturing complexity by limiting asymmetry to only the cutting-edge region rather than the entire drill body. The symmetrical portion can be manufactured using standard, simpler processes, while the asymmetrical cutting-edge region is formed through targeted machining or grinding operations.
Solution Approach 2:
The patent segments the drill into two functional regions: an asymmetrical cutting-edge region for vibration prevention and a symmetrical remaining portion for simple manufacturing and even chip discharge. This segmentation allows each region to be optimized independently for its specific function.
3Object-generated harmful factors
If asymmetry is extended along the entire axial length, then chatter is better prevented, but manufacturing becomes significantly more demanding and chip discharge becomes uneven
Solution Approach 1:
The patent confines asymmetry to the cutting-edge region where it is most effective for preventing chatter, while maintaining symmetry in the remaining axial length for even chip discharge and simplified manufacturing. This localized approach achieves adequate chatter prevention without the drawbacks of full-length asymmetry.
Solution Approach 2:
The patent divides the drill into functional segments: the asymmetrical cutting-edge region for vibration control and the symmetrical remaining portion for chip discharge and manufacturing efficiency. This segmentation avoids the manufacturing complexity and chip discharge problems associated with extending asymmetry along the entire axial length.
Data Source
AI summary
The invention relates to a drill tip (2) comprising a base body (6) having chip flutes (22A,B) and extending in the axial direction along an axis of rotation (8) and having at least two main cutting edges (14A,B) on the front face thereof extending outward in the radial direction to a cutting corner (16A,B). Seen in cross section, the base body is asymmetric relative to rotation about the axis of rotation (8) at the height of the cutting corner (16A,B). The cross section of the base body is simultaneously designed having symmetrical spacing from the main cutting edges (14A,B). The drill tip (2) is in particular designed as an interchangeable modular part of a modularly designed drill tip (5). A drill base body (4) in which the drill tip (2) can be inserted can therefore in turn be designed symmetrically.