Cutting Insert Wedge Geometry for Stable Multi-Angle Tool Holding

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Solution Overview

Problem

Existing metal cutting tools with wedged engagements between cutting inserts and holders either restrict to a single angle or allow a wide range of angles with line contact, failing to adapt to varying machining operation properties effectively.

Innovation Solution

A cutting tool design featuring a cutting insert with elongated wedge surfaces and a tool holder with pocket wedge surfaces, allowing for two distinct tool holder angles by ensuring only two regions of contact between the insert and holder, optimizing engagement based on machining operation properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single angle wedged engagement is used between cutting insert and holder, then the structure is simple, but the adaptability to different machining operations is limited

Engineering Contradiction:

Improveadaptability to different machining operationsVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The top and bottom abutment surfaces are segmented into inner and outer pairs of wedge surfaces with different angles. This segmentation allows the cutting insert to engage with the holder at different angle pairs (inner or outer) depending on the machining operation requirements, thereby improving adaptability without requiring multiple separate inserts

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting insert is designed with dual pairs of wedge surfaces (inner and outer) that can both engage with corresponding surfaces in the holder. This multi-functional design allows a single insert to serve multiple machining operations by selecting appropriate angle pairs, eliminating the need for different inserts for different applications

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Stability of the object's composition

If a wide range of angle wedged engagement is used with line contact, then the adaptability is improved, but the stability and precision of engagement deteriorates

Engineering Contradiction:

Improvestability of cutting insert in holderVSAvoidrange of engagement angles

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The continuous range of angles is segmented into discrete inner and outer angle pairs. Each pair provides a specific engagement angle with point/area contact rather than line contact, ensuring stable and precise engagement while still offering adaptability through the selection of different angle pairs

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the abutment surfaces (inner vs outer pairs) have different wedge angles optimized for specific machining conditions. This local differentiation allows precise angle selection for each machining operation while maintaining stable engagement through dedicated contact regions

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12172219B2Cutting insert having grooved top and bottom abutment surfaces with inner and outer pairs of wedge angles, and cutting tool

Publication Date: 2024.12.24 ISCAR LTD

AI summary

A cutting tool used for turning operations is releasably secured to a tool holder. The cutting insert includes top and bottom insert surfaces, each surface including two pairs of insert wedge surfaces. The tool holder includes an insert pocket having a pocket top surface and a pocket bottom surface. When the cutting tool is assembled, only one of the two pairs of insert wedge surfaces of the insert top surface engages the pocket top surface, and only one of the two pairs of insert wedge surfaces of the insert bottom surface engage the pocket bottom surface.