Double-Sided Elliptical Cutting Insert Anti-Rotation Design
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Solution Overview
Problem
Conventional indexable ball nose end mills with single-sided cutting inserts face issues with secure mounting, leading to insert rotation and premature wear of the second cutting edge due to exposure to chips during cutting tasks.
Innovation Solution
A double-sided cutting insert with an elliptical top and bottom surface, 180 degrees rotationally symmetrical about the major axis, and a female coupling portion for secure engagement with the insert pocket, preventing rotation and chip exposure to the unused cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-sided cutting insert is used with a screw mounting structure, then the insert can be securely mounted vertically, but the insert rotates around the screw due to cutting reaction forces
Solution Approach 1:
The cutting insert is designed with an asymmetric structure featuring a protrusion on one side that engages with a corresponding recess in the insert pocket. This asymmetric coupling prevents rotational movement around the screw mounting point, solving the problem of insert rotation while maintaining secure vertical mounting.
2Device complexity
If a single-sided cutting insert is used, then the mounting structure can be simplified, but the second cutting edge is exposed to chips and wears out prematurely
Solution Approach 1:
The invention combines two cutting edges on a single insert body, with the first cutting edge positioned to perform cutting tasks and the second cutting edge positioned to be protected from chip exposure. The asymmetric coupling structure ensures that during rotation, the unused cutting edge is shielded, allowing both edges to be utilized effectively and doubling the service life.
3Stability of the object's composition
If a recess is formed at the bottom surface of the cutting insert to prevent rotation, then the insert can be securely mounted, but the insert structure becomes more complex
Solution Approach 1:
Instead of forming a recess at the bottom surface, the invention uses an asymmetric protrusion-coupling mechanism on the side of the insert. This approach achieves the same anti-rotation function while maintaining a simpler, more integrated insert structure without requiring additional recess features.
Data Source
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AI summary
The present invention relates to a double-sided cutting insert and a cutting tool using the same. The cutting tool comprises: a tool body; and at least one double- sided cutting insert mounted on the tool body. The tool body includes at least one insert pocket for receiving the at least one double-sided cutting insert. The at least one double-sided cutting insert includes: an elliptical top surface; an elliptical bottom surface; first and second side surfaces connecting between both side ends of the top and bottom surfaces, respectively; a pair of corners connecting between both side ends of the first and second side surfaces, respectively; first and second cutting edges formed at a boundary portion between the top surface and the first side surface and a boundary portion between the bottom side surface and the second side surface and having a curved shape, respectively.