Spherical Recessed Cutting Tool for Lower Contact Resistance
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Solution Overview
Problem
Existing cutting tools face challenges in reducing contact resistance with workpieces, particularly when using recessed portions on flat surfaces, which can lead to inefficiencies in cutting performance and tool durability.
Innovation Solution
A cutting tool with a partially spherical surface featuring a plurality of recesses, where the opening edges of these recesses serve as cutting edges, formed from materials like binderless cubic boron nitride or nano polycrystalline diamond, with specific geometrical configurations to enhance cutting efficiency and tool longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If recessed portions are formed on a flat negative land or flank face, then contact resistance with the workpiece is reduced, but cutting performance and tool durability are compromised
Solution Approach 1:
The patent applies spheroidality by forming a spherical surface at the tip end portion of the cutting tool instead of using a flat surface. Multiple recesses are formed on this spherical surface, and the opening edges of these recesses create cutting edges. This curved spherical geometry allows the cutting edges to maintain proper contact with the workpiece while the recesses reduce contact resistance, resolving the contradiction between reducing harmful contact resistance and maintaining reliable cutting performance.
2Object-affected harmful factors
If recessed portions are formed on a flat surface, then contact resistance is reduced, but the sharpness and effectiveness of cutting edges deteriorate
Solution Approach 1:
The spherical surface geometry ensures that the opening edges of the recesses form sharp, effective cutting edges. The curvature of the spherical surface allows the recesses to be positioned such that their opening edges remain sharp and capable of effective cutting, while still reducing contact resistance through the recessed structure.
3Productivity
If multiple recesses are disposed apart from each other on a spherical surface, then cutting efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the spherical surface into multiple separate recesses that are disposed apart from each other. Each recess creates an individual cutting edge, and the segmented arrangement allows multiple cutting points to engage the workpiece simultaneously or sequentially, improving cutting efficiency while maintaining a relatively simple overall structure.
Data Source
AI summary
A cutting tool rotates about a rotation axis, and includes a tip end portion. The tip end portion includes a partially spherical surface that is brought into contact with a workpiece. The surface is provided with a plurality of recesses disposed apart from each other. An opening edge of each of the plurality of recesses constitutes a cutting edge.