Cutting Insert Land Geometry for Surface Accuracy and Edge Strength

Solution Overview

Problem

Existing cutting inserts face a trade-off between enhancing surface accuracy of machined surfaces and improving durability, as linear land surfaces enhance sharpness but lead to edge chipping, while curved land surfaces improve durability but reduce sharpness.

Innovation Solution

A cutting insert design with a combination of first and second land surfaces, where the first land surface has a linear shape near the corner and the second land surface has a protrusive curved shape along the side, optimized to enhance both cutting edge sharpness and durability by controlling chip flow and edge strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a linear land surface is used, then cutting edge sharpness is enhanced and surface accuracy is improved, but cutting edge strength is reduced and edge chipping occurs

Engineering Contradiction:

Improvesurface accuracyVSAvoidcutting edge strength

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The land surface is divided into multiple segments with different cross-sectional shapes: a first land surface with a linear cross-section for enhancing sharpness, and a second land surface with a protrusively curved cross-section for improving strength. This segmentation allows each portion to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the land surface are assigned different geometric properties tailored to their specific functional requirements. The first land surface near the corner has a linear shape optimized for sharpness, while the second land surface has a protrusively curved shape optimized for strength, creating local quality variations that resolve the contradiction.

Inventive Principle:

Principle #3Local quality

2Duration of action of stationary object

If a protrusively curved land surface is used, then cutting edge strength is improved and durability is enhanced, but cutting edge sharpness is reduced and surface accuracy deteriorates

Engineering Contradiction:

ImprovedurabilityVSAvoidsurface accuracy

Core Design Contradiction:

Duration of action of stationary objectVSManufacturing precision

Solution Approach 1:

The land surface is divided into multiple segments with different cross-sectional shapes: a first land surface with a linear cross-section for enhancing sharpness, and a second land surface with a protrusively curved cross-section for improving strength. This segmentation allows each portion to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the land surface are assigned different geometric properties tailored to their specific functional requirements. The first land surface near the corner has a linear shape optimized for sharpness, while the second land surface has a protrusively curved shape optimized for strength, creating local quality variations that resolve the contradiction.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If the entire land surface has a uniform shape, then manufacturing is simplified, but it cannot simultaneously optimize both sharpness and durability

Engineering Contradiction:

Improveland surface manufacturingVSAvoidperformance optimization

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The land surface is divided into multiple segments with different cross-sectional shapes: a first land surface with a linear cross-section for enhancing sharpness, and a second land surface with a protrusively curved cross-section for improving strength. This segmentation allows each portion to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the land surface are assigned different geometric properties tailored to their specific functional requirements. The first land surface near the corner has a linear shape optimized for sharpness, while the second land surface has a protrusively curved shape optimized for strength, creating local quality variations that resolve the contradiction.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260084221A1Cutting insert, cutting tool, and method for manufacturing machined product

Publication Date: 2026.03.26 KYOCERA CORP

AI summary

The present disclosure achieves both an improvement in the surface accuracy of a machined surface of a workpiece, and an improvement in the durability of a cutting insert. A main rake surface has a linear shape that approaches a reference plane with increasing distance from a land surface in a cross section orthogonal to an outer edge of an upper surface. The land surface includes a first land surface located along the corner portion, and a second land surface located along the side portion. The first land surface includes a first linear portion having a linear shape in a cross section orthogonal to the corner portion, and the second land surface has a protrusively curved shape as a whole in a cross section orthogonal to the side portion.