Circular Cutting Insert Seat With Internal Anti-Rotation Stop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cutting tools with circular cutting inserts face issues such as rotation within the insert seat during machining, leading to mechanical failure and imprecise positioning, especially for small inserts with manufacturing tolerances, and existing anti-rotation mechanisms are not suitable for small inserts due to wear and reduced support area.
Innovation Solution
A cutting tool design featuring a concavely curved duct and anti-rotation stops with a second stop surface completely located within the anti-rotation stopping indent, allowing for rotation inhibition up to 4° before contact, and providing clearance for deformation, ensuring stable anti-rotation and indexing functionality even with manufacturing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional anti-rotation mechanism with protrusions and sinusoidal pattern is used, then rotation of the cutting insert is prevented, but the bottom surface area of the cutting insert is reduced and the mechanism is subject to wear leading to deformation
Solution Approach 1:
The anti-rotation mechanism is segmented into discrete elements: the sinusoidal pattern is divided into multiple protrusions (first and second protrusions) with complementary grooves. This segmentation allows for distributed contact points that prevent rotation while maintaining a larger bottom surface area compared to a single continuous protrusion mechanism.
Solution Approach 2:
The invention employs curved surfaces in the anti-rotation mechanism, including the sinusoidal pattern on the cutting insert and the complementary curved grooves in the insert seat. These curved surfaces provide continuous contact during rotation attempts, distributing wear more evenly and preventing the deformation issues associated with sharp-edged protrusions.
2Reliability
If a conventional anti-rotation mechanism is used, then rotation is prevented, but the mechanism is subject to wear during machining which may cause deformation of the protrusions
Solution Approach 1:
The insert seat is designed with hardened surfaces and optimized geometry in the regions where contact with the cutting insert occurs. This pre-hardening and geometric optimization cushions against wear before it becomes problematic, extending the service life of the insert seat while maintaining reliable anti-rotation functionality throughout its operational life.
Solution Approach 2:
The invention changes the geometric parameters of the anti-rotation mechanism, specifically the profile and distribution of the sinusoidal pattern and protrusions. These parameter optimizations reduce stress concentrations and distribute contact forces more evenly, minimizing wear and deformation over time while maintaining effective rotation prevention.
3Ease of operation
If circular cutting inserts are used, then positioning difficulty arises due to absence of straight edges, but the inserts require small manufacturing tolerances which makes them expensive
Solution Approach 1:
The invention introduces asymmetric features into the otherwise circular cutting insert design. The sinusoidal pattern and the positions of the protrusions create asymmetric contact points that provide natural positioning references. This allows circular inserts to be positioned accurately without requiring extremely tight roundness tolerances, reducing manufacturing costs while maintaining ease of operation.
Data Source
AI summary
A cutting tool includes a cutting insert having an anti-rotation stopping indent formed in a transition between a bottom surface and a side surface thereof and includes a first stop surface. The insert seat has at least one anti-rotation stop, which protrudes with respect to a side wall of the insert seat and includes a second stop surface. The anti-rotation stop is arranged to inhibit rotation of the cutting insert in the insert seat by contact between the first and second stop surfaces. The second stop surface is completely located within the anti-rotation stopping indent when the cutting insert is mounted. As seen in a section perpendicular to a common central axis, an angle of less than 180° is formed between a tangent to the second stop surface and a tangent to the first duct at a transition between the two.