Cutting Insert Wedge Abutments Against Rotational Displacement

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Solution Overview

Problem

Existing cutting tools experience rotational displacement of the cutting insert due to torque generated during metalworking operations, which is not effectively prevented by current stopper abutment surfaces.

Innovation Solution

The cutting insert and insert holder are designed with converging abutment surfaces and a mounting arrangement that includes stopper and wedge abutment surfaces to stabilize the cutting insert, preventing rotational displacement by engaging with corresponding surfaces in the insert holder.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single stopper abutment surface is used to prevent rotational displacement, then the structure is simple, but the cutting insert still experiences rotational displacement under cutting torque

Engineering Contradiction:

Improveprevention of rotational displacementVSAvoidmounting arrangement structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mounting arrangement is segmented into three distinct abutment surfaces: a stopper abutment surface positioned forward of the pivot point to prevent rotation, and two wedge abutment surfaces positioned rearward of the pivot point to provide additional stability. This segmentation allows each surface to perform its specific function independently, effectively preventing rotational displacement while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution transitions from a single-point abutment to a distributed multi-surface abutment system. By adding the two wedge abutment surfaces in addition to the stopper abutment surface, the system distributes the anti-rotation function across multiple locations and orientations, creating a more robust prevention mechanism against rotational displacement under cutting torque.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Manufacturing precision

If the stopper abutment surface is positioned close to the cutting edge for better control, then positioning accuracy improves, but the surface becomes vulnerable to cutting forces and wear

Engineering Contradiction:

Improveinsert positioning accuracyVSAvoidabutment surface durability

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The stopper abutment surface is extracted from the cutting zone and positioned forward of the pivot point, separating its positioning function from the cutting forces. This allows the stopper surface to maintain positioning accuracy without being directly exposed to the harmful cutting forces and wear that would affect a surface positioned closer to the cutting edge.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The pivot point acts as an intermediary between the stopper abutment surface and the cutting edge. By positioning the stopper surface forward of the pivot point, the system uses the pivot point as a mediator to transmit the positioning function while isolating the stopper surface from direct exposure to cutting forces, thereby protecting it from wear.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If wedge abutment surfaces are added to improve stability, then resistance to rotational displacement increases, but the mounting arrangement complexity increases

Engineering Contradiction:

Improvestability against rotationVSAvoidnumber of abutment surfaces

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The two wedge abutment surfaces are merged into a symmetric configuration positioned rearward of the pivot point, working in conjunction with the stopper abutment surface. This merging creates a coordinated system where the wedge surfaces provide additional stability through their geometric configuration, increasing resistance to rotational displacement while maintaining a manageable level of complexity through symmetry and integration with the existing stopper surface.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design stabilizes the cutting insert, ensuring accurate positioning and effective operation by preventing rotational displacement, enhancing tool performance and longevity.

Implementation Method 1

two opposite-facing first wedge abutment surfaces (60, 62) oriented transversely to the at least one first side abutment surface (56) and converging towards each other at an acute first wedge angle (alpha) in a direction towards the first cutting edge (48)

Methodology Applied

Scientific EffectWedge: Wedge

Data Source

PatentUS12491565B2Cutting insert having two forwardly converging abutment surfaces, insert holder and cutting tool

Publication Date: 2025.12.09 ISCAR LTD

AI summary

A cutting insert includes opposing insert first and second side surfaces. The insert first side surface includes a first mounting arrangement. The first mounting arrangement includes a) at least one first side abutment surface facing away from the insert second side surface, b) a first stopper abutment surface oriented transversely to the at least one first side abutment surface and c) two opposite-facing first wedge abutment surfaces oriented transversely to the at least one first side abutment surface and converging forwardly. An insert holder has a corresponding pocket mounting arrangement for engagement with the first mounting arrangement.