Round Cutting Insert Reverse Anti-Rotation Feature

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Round cutting inserts in milling tools tend to rotate within their pockets due to the lack of mechanical interference, leading to loosening of clamping screws and potential damage, which increases manufacturing costs when anti-rotation features like projections are used to prevent rotation.

Innovation Solution

A round cutting insert with recesses and a corresponding insert pocket with a projection that cooperates to prevent rotation, utilizing dimples and a projection for secure mounting, reducing manufacturing complexity and cost.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple projections are formed on the insert to prevent rotation, then rotation prevention effectiveness is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improverotation prevention effectivenessVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of forming protruding projections on the insert to prevent rotation, the patent inverts the approach by forming recesses (dimples) on the insert that receive protruding features from the tool body. This inversion simplifies insert manufacturing while maintaining effective rotation prevention, as the tool body can be manufactured with standard protruding features rather than requiring complex multi-projection inserts.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If multiple projections are formed on the insert to prevent rotation, then rotation prevention effectiveness is improved, but manufacturing cost increases

Engineering Contradiction:

Improverotation prevention effectivenessVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent inverts the anti-rotation feature configuration: instead of expensive multi-projection inserts, it uses inserts with recesses that mate with simpler protruding features on the tool body. This reduces insert manufacturing cost while maintaining rotation prevention functionality.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent treats the insert as a disposable or replaceable component with simplified geometry (recesses rather than complex projections). The more expensive tool body contains the durable anti-rotation protrusions, while the cheaper insert can be easily replaced if damaged, reducing overall system cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS8657539B2Round cutting insert with reverse anti-rotation feature

Publication Date: 2014.02.25 KENNAMETAL INC

AI summary

A round cutting insert with a reverse anti-rotation feature that can be manufactured easily and inexpensively is disclosed. The round cutting insert includes a plurality of dimples formed on a first surface and another plurality of dimples formed on a second, opposing surface. The round insert is reversible and indexable. The round cutting insert is removable received in an insert receiving pocket in a tool body. The insert receiving pocket includes a single projection that is capable of being received in one of the plurality of dimples. The cooperation between the projection and one of the plurality of dimples prevents rotation of the round cutting insert when mounted in the insert receiving pocket. The plurality of dimples and the projection can be any desirable complimentary shape, such as a slot, a V-shape, a wagon wheel, a sports wheel, a pyramid, and the like.