Double-Sided Round Cutting Insert With Radial Protrusions for Stable Indexing
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Solution Overview
Problem
Round cutting inserts in milling tools face limitations in the number of index positions and stability, leading to inefficient machining and reduced service life due to limited rotational lock stability and complex manufacturing requirements.
Innovation Solution
A double-sided round cutting insert design featuring a side surface with double positive clearance surfaces and protrusions that extend radially, providing increased rotational stability and flexibility in indexation, allowing for a larger number of rotation or index positions without the need for complex locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional locking means are provided on round cutting inserts to improve rotational stability, then reliability improves, but device complexity increases
Solution Approach 1:
The round cutting insert utilizes its own peripheral surface as the locking interface with the insert seat, eliminating the need for separate locking mechanisms. The insert's geometry itself provides the locking function through the engagement between the round periphery and the corresponding seat structure, making the system self-sufficient and reducing overall complexity.
Solution Approach 2:
Instead of adding locking elements to the insert, the solution inverts the approach by designing the insert seat with the locking feature. The insert seat includes a peripheral surface that engages with the round insert, transferring the locking function from the insert to the seat structure.
2Productivity
If the number of index positions is increased by reducing rotation angle, then productivity improves, but manufacturing precision requirements increase
Solution Approach 1:
The round cutting insert is divided into multiple index positions along its periphery, with each position representing a discrete cutting edge location. The circular geometry naturally segments the insert into equal angular intervals, allowing for multiple index positions (e.g., 6 positions at 60-degree intervals) without requiring complex precision features.
Solution Approach 2:
The round shape of the cutting insert provides continuous curvature that naturally accommodates multiple index positions. The circular periphery allows for evenly spaced indexing locations around the entire circumference, maximizing the number of usable cutting edges while maintaining simple geometry and manufacturing.
Data Source
AI summary
An indexable and double-sided round cutting insert includes an upper and lower side. A center axis extends between the upper and lower side and a median plane extends perpendicular to the center axis and is situated halfway between the upper and lower side. A side surface has an upper and lower positive clearance surface at an upper positive clearance angle with respect to an upper cutting edge and a lower positive clearance angle with respect to a lower cutting edge. A plurality of protrusions extends along the side surface and protrude in a radial direction perpendicular to the center axis. Each protrusion includes an outer surface, which along the center axis, extends such that a first radial distance from the center axis to the outer surface in the median plane is at least equal to or greater than a second radial distance from the center axis to the outer surface.