Cutting Tool Shim Ridge for Insert Mounting
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Solution Overview
Problem
Existing cutting tools and toolholders face challenges in securely and accurately mounting cutting inserts, leading to significant stresses on screws due to severe forces, which can result in instability and potential damage.
Innovation Solution
The design incorporates a cutting tool and toolholder with a through hole featuring a frustoconical portion and a cylindrical portion, along with a shim and screw system that includes a part-circular ridge to distribute clamping forces and guide the insert into a stable position, reducing stress on the screw by providing multiple points of contact and minimizing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw is used to clamp the cutting insert to the toolholder, then the insert can be securely mounted, but the screw is subjected to significant stresses due to severe forces
Solution Approach 1:
A shim is introduced as an intermediary element between the cutting insert and the toolholder. The shim distributes the clamping forces from the screw over a larger area and provides additional contact points, thereby reducing the stress concentration on the screw while maintaining secure mounting of the insert
Solution Approach 2:
The mounting system is segmented into multiple components: the screw, the shim, the insert, and the toolholder. The shim is divided into segments that contact different surfaces (the insert's mounting surface and the toolholder's clamp surface), allowing forces to be distributed through multiple contact points rather than concentrated on the screw alone
2Manufacturing precision
If the screw axis is offset from the insert axis to guide the insert into position, then mounting accuracy is improved, but friction and stress on the screw increase
Solution Approach 1:
The shim acts as a mediator that facilitates the guiding function. The offset screw applies force to the shim, which in turn guides the insert into the correct position through controlled contact. This reduces direct friction between the screw and insert while maintaining positioning accuracy
Solution Approach 2:
The mounting process is made dynamic through the offset screw mechanism. As the screw is tightened, it dynamically guides the insert from a loose position to a precisely positioned state. The shim enables this dynamic guiding action while minimizing sustained friction forces
3Strength
If multiple contact points are provided to distribute clamping forces, then stress on the screw is reduced, but device complexity increases
Solution Approach 1:
The shim serves as a simple intermediary component that creates multiple contact points without significantly increasing complexity. It contacts the insert at one surface and the toolholder at another, distributing forces through these additional contact points while adding only one simple element to the system
Data Source
AI summary
The bottom abutment surface (53) of a recess (31) of a toolholder for a cutting insert includes a part - circular ridge (65) extending around part of an internally threaded hole (57). An insert (23) to be mounted in the recess includes a through hole (39) having a generally cylindrical portion (47) extending to a bottom surface (35) of the insert to be mounted against a bottom abutment surface of the recess. A largest radius portion of the ridge has a radius equal to or less than a radius of the generally cylindrical portion.