Cutting Insert Abutment Bars Pocket Engagement

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing indexable cutting inserts with non-planar surfaces face challenges in achieving optimal engagement with the insert pocket due to identical shapes for cutting and engagement surfaces, leading to deteriorated engagement and the need for extensive grinding, which is costly and can result in coating peeling and unnecessary edge grinding.

Innovation Solution

A cutting insert design featuring abutment bars on its side surfaces, allowing for proper engagement with the insert pocket while maintaining cutting properties, with the abutment bars extending outwardly to facilitate efficient grinding and prevent interference during cutting operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If extensive grinding is performed on multiple surfaces and edges to achieve engagement, then engagement is improved, but manufacturing cost increases and coating peeling occurs

Engineering Contradiction:

ImproveengagementVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The abutment bars are integrally formed with the cutting insert during manufacturing, pre-establishing the engagement surfaces in the correct planar configuration. This eliminates the need for subsequent extensive grinding operations to achieve proper engagement geometry.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The engagement function is extracted from the general side surface geometry and concentrated into specific abutment bar structures. This allows the engagement surfaces to be separately optimized and manufactured without requiring extensive processing of the entire insert.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If extensive grinding is performed on edges together with engagement surfaces, then engagement is improved, but unnecessary edge material is removed and coating peeling occurs

Engineering Contradiction:

ImproveengagementVSAvoidmaterial loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The abutment bars are positioned and dimensioned to create engagement surfaces that are spatially separated from the cutting edges. This segmentation ensures that grinding operations on the engagement surfaces do not affect the cutting edges, preventing unnecessary material loss.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The abutment bars act as intermediary structures that provide the necessary engagement function while serving as a buffer zone between the cutting edges and the engagement surfaces, protecting the cutting edges from unnecessary grinding.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8753045B2Cutting insert having abutment bars and cutting tool therefor

Publication Date: 2014.06.17 ISCAR LTD

AI summary

A cutting tool has a cutting insert secured in an insert pocket. The cutting insert has two abutment bars located on its opposing side surfaces. The abutment bars of a respective side surface have generally coplanar outer surfaces which define an imaginary plane that does not intersect any portion of the respective side surface apart from the outer surfaces. The outer surfaces of one set of abutment bars engage a major wall of the insert pocket.