Asymmetrical Rotary Cutting Tool Core for Vibration Damping
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Solution Overview
Problem
Rotary cutting tools experience reduced stability and increased vibrations due to a significantly reduced cross-sectional area at the transition to the shank area, affecting service life and processing quality.
Innovation Solution
A rotary cutting tool with an asymmetrical core profile featuring alternating sections of increasing and decreasing cross-sectional areas, where the center line of the core profile deviates from the axis of rotation, enhancing vibration damping and chip breaking without compromising stability, and allowing optimal mass distribution for improved vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the cross-sectional area of the core profile is significantly reduced at the transition to the shank area, then the tool can achieve lighter weight and potentially higher speed, but the stability of the tool against lateral and torsional loads is considerably reduced
Solution Approach 1:
The patent applies asymmetry by designing an asymmetric core profile where the centerline deviates from the axis of rotation. This asymmetric configuration creates an uneven mass distribution that generates centrifugal forces to counteract vibrations, thereby maintaining stability even with reduced cross-sectional area at the transition zone.
Solution Approach 2:
The patent changes the geometric parameters of the core profile by introducing alternating sections with increasing and decreasing cross-sectional areas along the cutting area. This parameter variation optimizes the mass distribution and creates dynamic balancing effects that suppress vibrations while allowing weight reduction.
2Productivity
If the cross-sectional area of the core profile is significantly reduced at the transition to the shank area, then the tool may achieve higher productivity, but increased vibrations occur which negatively impact tool life and machining quality
Solution Approach 1:
The asymmetric core profile with centerline deviation from the rotation axis creates unbalanced mass distribution that generates centrifugal forces. These forces act as a counterbalance to vibration-induced forces, suppressing chatter and vibrations that would otherwise reduce tool life and machining quality, thereby enabling sustained high-productivity operation.
Solution Approach 2:
The patent applies local quality by creating alternating sections with different cross-sectional areas at specific locations along the cutting area. This localized variation in mass distribution creates dynamic vibration damping effects precisely where needed in the cutting zone, protecting tool life and surface quality without compromising overall productivity.
3Object-affected harmful factors
If an asymmetric core profile with alternating sections is used, then vibration damping is significantly improved, but the manufacturing complexity increases
Solution Approach 1:
The complex asymmetric core profile is segmented into alternating sections with increasing and decreasing cross-sectional areas. This segmentation approach allows the complicated geometry to be constructed from simpler repeating patterns, making the design more manageable and potentially easier to manufacture through modular fabrication processes.
Solution Approach 2:
The core profile employs periodic alternation between sections of increasing and decreasing cross-sectional area. This periodic structure creates regular patterns in mass distribution that generate consistent centrifugal forces for vibration damping, while the repeating nature of the pattern simplifies manufacturing compared to an entirely irregular geometry.
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
This design effectively suppresses vibrations, ensuring smooth operation, high surface quality, and extended service life, particularly beneficial in milling cutters where lateral forces are significant.
Implementation Method 1
the mass distribution in the cutting area can be optimally adjusted, thereby significantly improving the vibration damping of the asymmetrical arrangement of the core diameters. This allows vibrations in the rotary cutting tool to be reliably suppressed
Data Source
Figure 1~1c
Figure 2~2d
Figure 3~3d
AI summary
The invention relates to a rotary cutting tool (1; 13; 14; 15; 17) having an axis of rotation (2), a shank area (3), and a cutting area (4), wherein the rotary tool (1; 13; 14; 15, 17) has chip flutes (5) reaching as far as a core profile (7) in the cutting area (4). In order to reduce vibrations of the rotary cutting tool and therefore to permit precise machining and high surface quality with long service lives, the center line (8) of the core profile (7) has a course that deviates from the axis of rotation (2) of the rotary cutting tool (13; 14) and/or the core profile (7) contains a plurality of mutually alternating sections with increasing cross-sectional area (11; 12) and sections with decreasing cross-sectional area (9; 10) over the length of the cutting area (4).