Cutting Insert Restraint Surface for Stable Milling Edge Position

Solution Overview

Problem

Cutting inserts supported far from the cutting edge experience instability due to large loads applied to fixing screws, leading to positional deviations during cutting operations.

Innovation Solution

A cutting insert design featuring strategically positioned restraint surfaces and concave surfaces that reduce the moment acting on these surfaces, allowing for stabilization of the cutting edge position by distributing cutting resistance effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the cutting insert is supported by the body at a position far away from the cutting edge, then the structure is simpler and easier to manufacture, but a large load is applied to the fixing screw and the cutting edge position becomes unstable

Engineering Contradiction:

Improveease of manufactureVSAvoidcutting edge position stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The support function is segmented into two distinct components: the original support surface for general support and a new restraint surface positioned closer to the cutting edge for stability. This segmentation allows each surface to perform its specific function optimally without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The restraint surface is positioned in a different spatial dimension (closer to the cutting edge along the circumferential direction) compared to the traditional support position. This dimensional change creates a more favorable moment arm geometry that reduces the moment on the fixing screw while maintaining overall structural simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If the cutting insert is supported far from the cutting edge, then the device complexity is reduced, but the moment acting on the support increases causing positional deviation

Engineering Contradiction:

Improvedevice complexityVSAvoidmoment on support

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The support function is segmented into two distinct components: the original support surface for general support and a new restraint surface positioned closer to the cutting edge for stability. This segmentation allows each surface to perform its specific function optimally without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The restraint surface is positioned in a different spatial dimension (closer to the cutting edge along the circumferential direction) compared to the traditional support position. This dimensional change creates a more favorable moment arm geometry that reduces the moment on the fixing screw while maintaining overall structural simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11453073B2Cutting insert and milling tool

Publication Date: 2022.09.27 TUNGALOY CORP

AI summary

A cutting insert includes a first end surface and a second end surface, in which a first peripheral side surface includes a first rake surface adjacent to a first main cutting edge and a first concave surface connected to the second end surface and formed to be recessed from the first rake surface toward a central axis of a through hole, and the first concave surface has a first restraint surface provided at a position where a distance between the first restraint surface and a second main cutting edge is smaller than a distance between the central axis of the through hole and the second main cutting edge, when viewed from a direction parallel to the central axis of the through hole.