Cutting Tool Insert Clamping with Dual Directional Force Distribution
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Solution Overview
Problem
Existing cutting tool clamping arrangements with frustoconical screws often experience screw breakage due to high shear forces applied during clamping, which compromises the secure and accurate attachment of replaceable inserts to toolholders.
Innovation Solution
A cutting tool design featuring a first clamp applying a clamping force in one direction and a second clamp limiting rotation, with both clamps working together to distribute forces and reduce shear stress on the screws, utilizing a combination of frustoconical and internally threaded mechanisms to securely hold the insert in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single frustoconical screw is used to clamp the insert, then the insert can be secured to the toolholder, but the screw is subjected to high shear forces that cause breakage
Solution Approach 1:
The single clamping function is divided into two separate clamps: a first clamp that applies clamping force in a first direction to clamp the insert to the insert supporting surface, and a second clamp that applies clamping force in a second direction to clamp the insert to a second insert supporting surface. This segmentation distributes the shear forces between two clamps, preventing any single screw from experiencing excessive shear stress that would cause breakage.
Solution Approach 2:
The solution transitions from a single-direction clamping approach to a multi-directional clamping system. The first clamp operates in a first direction while the second clamp operates in a second direction, creating a three-dimensional clamping arrangement that distributes forces more effectively and reduces shear stress on individual clamping elements.
2Reliability
If the screw applies lateral force to urge the insert against recess walls, then the insert is more securely supported, but shear stress on the screw increases
Solution Approach 1:
The lateral support function is segmented between two clamps. The first clamp provides primary clamping while the second clamp provides lateral support by clamping the insert to a second insert supporting surface. This segmentation allows the lateral support function to be achieved without concentrating all shear forces in a single screw.
3Manufacturing precision
If a second clamp is added to limit rotation and provide additional clamping, then clamping accuracy is improved, but device complexity increases
Solution Approach 1:
The second clamp serves multiple functions simultaneously: it limits rotation of the insert about the clamping axis, provides lateral support by clamping the insert to the second insert supporting surface, and distributes shear forces. This multi-functionality achieves improved clamping accuracy and stability without proportionally increasing device complexity.
Data Source
AI summary
A cutting tool includes a cutting insert and a toolholder including at least one insert supporting surface. A first clamp is adapted to apply a clamping force in a first direction to clamp the insert to the insert supporting surface, and a second clamp is adapted to limit rotation of the insert about an axis extending substantially in the first direction. The toolholder includes a second insert supporting surface. The second clamp applies a clamping force to the insert in a second direction to clamp the insert to the second insert supporting surface, and the second insert supporting surface is disposed on an opposite side of the insert from the second clamp.