Shoulder Milling Insert Geometry for Higher Holding Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing cutting inserts for shoulder milling tools lack stable support, leading to instability during milling operations, which affects the cutting performance and tool life.

Innovation Solution

A trigonally shaped cutting insert with a median plane, featuring three indexable cutting edges, a surface-wiping secondary cutting edge inclined towards the median plane, and a clearance surface forming a negative nominal clearance angle, providing increased holding moment and support through abutment surfaces configured for stable engagement with the shoulder milling tool.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the cutting insert uses a conventional clearance surface arrangement, then the cutting edge can engage the workpiece, but the holding moment and stability of the cutting insert in the shoulder milling tool are insufficient

Engineering Contradiction:

Improvestability of cutting insertVSAvoidclearance surface configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent inverts the conventional clearance angle configuration by implementing a negative nominal clearance angle. Instead of the clearance surface being angled away from the workpiece (positive angle), it is angled toward the workpiece (negative angle), which allows the abutment surface to extend farther from the center and provide increased holding moment and stability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extends the abutment surface in the radial direction away from the center of the cutting insert, creating a larger lever arm for the holding moment. This dimensional extension in the radial direction provides enhanced stability without increasing the overall size of the insert.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the abutment surface is positioned closer to the center of the cutting insert, then the insert structure is more compact, but the holding moment and stable support are reduced

Engineering Contradiction:

Improveholding momentVSAvoidinsert size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent creates an asymmetric configuration where the abutment surface is positioned asymmetrically relative to the center of the cutting insert, extending farther in the radial direction. This asymmetric placement maximizes the holding moment while maintaining a compact overall insert geometry.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS11229960B2Cutting insert and shoulder milling tool

Publication Date: 2022.01.25 SANDVIK INTELLECTUAL PROPERTY AB

AI summary

A cutting insert and a shoulder milling tool are disclosed. The cutting insert includes a surface-wiping secondary cutting edge inclined in relation to a median plane of the cutting insert, such that a distance to the median plane decreases in a direction toward a corner cutting edge. A circumferential surface includes a clearance surface extending along a main cutting edge. The clearance surface along the main cutting edge extends at an acute angle to the median plane, such that the clearance surface forms a negative nominal clearance angle, and wherein the circumferential surface includes first and second abutment surfaces configured for abutment against axial and/or radial support surfaces of the milling tool, the abutment surfaces extending along at least part of the main cutting edge and the surface-wiping secondary cutting edge.