Cutting Insert Asymmetric Inclination Suppresses Chattering

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Cutting inserts with a V-shaped lower surface face issues with reduced fixing property due to uneven distribution of cutting resistance and centrifugal force, leading to potential chattering and fracturing, especially when the inner-periphery-side inclined surface is distant from the insert mounting seat.

Innovation Solution

A cutting insert design featuring a first side surface part related to the major cutting edge that gradually becomes more distant from a virtual plane, allowing a wider contact area with the insert mounting seat, combined with an inclined part on the second end surface that expands to securely contact the seat, enhancing the fixing property and reducing chattering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the cutting insert is arranged with a negative radial rake angle to increase back metal portion thickness, then chattering is suppressed, but the cutting insert is prone to slide toward the outer periphery, reducing fixing property

Engineering Contradiction:

Improvechattering suppressionVSAvoidfixing property

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The asymmetric inclination angles of the two inclined surfaces create a mechanical interlock effect that counteracts the sliding tendency caused by negative radial rake angle arrangement, while maintaining the stability benefits of the negative rake angle configuration

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The inclined surfaces act as counterbalancing elements that provide resistance against the outward sliding force generated by the negative radial rake angle arrangement, effectively balancing the forces acting on the cutting insert

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Data Source

PatentUS10350687B2Cutting insert having outwardly inclined side surface and inwardly inclined lower surface, and rotary cutting tool

Publication Date: 2019.07.16 TUNGALOY CORP

AI summary

A cutting insert has opposing first and second end surfaces, and a peripheral side surface (connecting the end surfaces. A central axis penetrates the two end surfaces. The peripheral sure surface includes an outwardly inclined first side surface part related to a major cutting edge and a second side surface part related to a minor cutting edge. The outwardly inclined first side surface part gradually extends outward from the cutting insert, heading from the first end surface to the second end surface. When a second virtual plane, which is substantially perpendicular to the central axis and passes through the major cutting edge, is defined, an inwardly inclined part, on a back side of the cutting edge, of the second end surface is inclined so as to become more distant from the second virtual plane, heading from the outwardly inclined first side surface part to the central axis.