Rotary Cutting Insert Honing for Edge Strength and Biting
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Solution Overview
Problem
Rotary tools, such as drills, face issues with cracking at the midpoint of the honed surface due to minimal width, and increasing the width for edge reinforcement degrades biting properties.
Innovation Solution
The rotary tool design incorporates a cutting insert with a base, cutting edge, and flute, featuring a first cutting edge formed by round honing and a second cutting edge formed by chamfer honing, with a positive rake angle, to enhance strength and durability while maintaining biting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the width of the honed surface is increased for edge reinforcement, then strength is improved, but biting properties degrade
Solution Approach 1:
The patent applies different honing methods to different regions of the cutting edge: round honing is applied to the first cutting edge (intersecting the rotation axis) to maintain sharpness and biting properties, while chamfer honing is applied to the second cutting edge (closer to outer periphery) to enhance strength and durability. This localized differentiation resolves the contradiction by optimizing each region's properties according to its functional requirements.
2Productivity
If the width of the honed surface is minimized, then biting properties are maintained, but cracking occurs at the midpoint
Solution Approach 1:
The patent differentiates the honing treatment between two cutting edges: the first cutting edge uses round honing with minimal width to maintain biting properties, while the second cutting edge uses chamfer honing with increased width to prevent cracking. This local quality approach allows each cutting edge to have optimal properties for its specific function, resolving the contradiction between biting properties and cracking resistance.
3Ease of manufacture
If a single honing method is applied to the entire cutting edge, then manufacturing is simplified, but both strength and biting properties cannot be optimized simultaneously
Solution Approach 1:
The patent implements different honing methods (round honing and chamfer honing) on different cutting edges to simultaneously optimize strength and biting properties. While this increases manufacturing complexity compared to a single honing method, it enables each cutting edge to achieve its optimal performance characteristics, with the first cutting edge maintaining sharpness and the second providing enhanced strength.
Data Source
AI summary
A cutting insert may include a base, a cutting edge and a flute. The base may include a rotation axis and may be extended from a first end to a second end. The cutting edge may be located on a side of the first end. The flute may be extended from the cutting edge toward the second end. The cutting edge may include a first cutting edge and a second cutting edge. The first cutting edge may intersect with the rotation axis in a front view. The second cutting edge may be located closer to an outer periphery than the first cutting edge, and a rake angle of the second cutting edge may have a positive value. The first cutting edge may be formed by round honing, and the second cutting edge may be formed by chamfer honing.