Indexable Cutting Insert with V-Shaped Engagement Ridges

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Solution Overview

Problem

Existing cutting tools for turning operations face challenges in achieving high clamping stability and resistance to transverse cutting forces, while also requiring efficient manufacturing processes.

Innovation Solution

A single-sided indexable cutting insert with rhombus-shaped surfaces and V-shaped engagement ridges and grooves, combined with a tool holder featuring a single engagement groove and coplanar support steps, provides enhanced clamping stability and resistance to transverse forces through a robust and efficient design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple engagement ridges and grooves are used to improve clamping stability, then resistance to transverse cutting forces improves, but device complexity increases

Engineering Contradiction:

Improveclamping stabilityVSAvoidengagement structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base surface is divided into at least two separate base sub-surfaces by the engagement ridges, creating distinct functional zones for clamping and support. This segmentation allows the cutting insert to be securely engaged while maintaining manufacturing simplicity through clear geometric division.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the base surface are assigned different functions: the central boss provides localized support at the center, while the engagement ridges provide localized clamping at specific positions. This local differentiation optimizes clamping stability without requiring complex structures across the entire base surface.

Inventive Principle:

Principle #3Local quality

2Reliability

If complex engagement structures are used to improve resistance to transverse forces, then cutting reliability improves, but manufacturing difficulty increases

Engineering Contradiction:

Improveresistance to transverse forcesVSAvoidtool holder manufacturing

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The engagement ridges are positioned asymmetrically on the base surface, with each ridge located to optimize resistance against transverse forces in specific directions. This asymmetric arrangement provides enhanced mechanical engagement while maintaining relatively simple manufacturing processes for both the insert and tool holder.

Inventive Principle:

Principle #4Asymmetry

3Ease of manufacture

If the base surface is kept as a single continuous surface, then manufacturing simplicity is maintained, but clamping stability is reduced

Engineering Contradiction:

Improveinsert manufacturingVSAvoidclamping stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP2822719B1Cutting tool and cutting insert therefor

Publication Date: 2018.04.04 ISCAR LTD

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AI summary

An indexable cutting insert has opposing rhombus-shaped upper and lower surfaces and a peripheral side surface extending therebetween with alternating obtuse and acute corner surfaces. A nose cutting edge is formed at the intersection of the upper surface with each of the two acute corner surfaces. The lower surface includes a base surface from which a central boss and exactly two engagement ridges protrude. Each engagement ridge extends from the central boss to intersect with its respective acute corner surface, and the base surface is divided into two base sub-surfaces. The insert may be clamped against a seating surface of a tool holder pocket solely by the engagement ridge located closest to the operative nose cutting edge making contact with a corresponding single engagement groove, and the two base sub-surfaces making contact with two coplanar raised support surfaces.