Machining Tool With Varying Helix Angles For Fiber-Reinforced Materials
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Solution Overview
Problem
Cutting tools for machining fiber-reinforced materials face a trade-off between cutting quality and smooth running, where improvements in cutting quality often lead to increased vibration and reduced smoothness due to the direction of force changes.
Innovation Solution
The cutting tool features cutting edges with varying helix angles, including alternating positive and negative helix angles on different wings, and additional cutting edges angled between wings, which scatter force vectors and reduce vibration excitation, enhancing both cutting quality and smooth running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spiral angle is increased to more than 30° to improve cutting quality, then cutting quality and edge quality improve, but the workpiece is excited to vibrate and smooth running deteriorates
Solution Approach 1:
The patent applies local quality by giving different helix angles to different cutting edges on the same tool. Specifically, cutting edges are assigned different helix angles from a range of -30° to +30°, with at least one positive and at least one negative angle, so that each cutting edge has optimized local properties for its specific position and function while collectively reducing vibration through angle diversity.
Solution Approach 2:
The patent employs asymmetry by intentionally creating an asymmetric distribution of helix angles among cutting edges. Instead of using uniform symmetric angles, the design uses at least one positive helix angle and at least one negative helix angle, creating an asymmetric force distribution pattern that prevents resonant vibration while maintaining cutting effectiveness.
2Manufacturing precision
If measures are taken to improve cutting quality, then cutting quality improves, but smooth running deteriorates as a side effect
Solution Approach 1:
The patent applies parameter changes by varying the helix angle parameter across different cutting edges. The helix angles are selected from a range of -30° to +30°, with at least one positive and at least one negative angle, creating a diversified parameter set that simultaneously achieves high cutting quality through optimized local angles and smooth running through vibration reduction from angle variation.
Data Source
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AI summary
A machining tool (2, 2.2, 2.3) for machining fiber-reinforced materials has a plurality of machining flutes (3, 4) which are separated from each other in the circumferential direction by lands (5, 6, 7, 20, 5.3, 6.3); at least one land (5, 6, 7, 20, 5.3, 6.3) has a plurality of cutting edges (10, 21, 30, 31, 39) on its circumferential side, said cutting edges extending at a helix angle (a1 - an, b1 - bn, c1 - cn, d1 - dn) > 25° relative to the longitudinal axis (15) of the machining tool (2, 2.2, 2.3). The disclosed machining tool (2, 2.2, 2.3) is characterized in that at least two cutting edges (10, 21, 30, 31, 39) on the at least one land (5, 6, 7, 20, 5.3, 6.3) have different helix angles (a1 - an, b1 - bn, c1 - cn, d1 - dn).