Cutting Insert Fitting Geometry for Accurate Edge Positioning

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Solution Overview

Problem

The existing cutting inserts experience significant displacement at the cutting edge when attached to a holder, leading to precision and stability issues during machining processes.

Innovation Solution

The cutting insert design includes a cylindrical body with specific fitting portions and a cutting portion, where the central angles between these portions are strategically defined to minimize displacement, allowing for precise attachment and reduced positional deviation when fixed to a holder using a fastening bolt.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the cutting insert uses a conventional attachment structure with fitting portions, then the cutting insert can be fixed to the holder, but significant displacement occurs at the cutting edge during machining

Engineering Contradiction:

Improvecutting edge position accuracyVSAvoidcutting insert stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The patent applies asymmetry by making the third central angle (between first and second fitting portions) smaller than the first and second central angles. This asymmetric angular distribution of fitting portions creates an optimized attachment geometry that reduces cutting edge displacement while maintaining stable fixation to the holder

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent changes the geometric parameters of the fitting portions by specifically defining the central angles between them. The third central angle is set to be smaller than the other two central angles, creating an optimized parameter configuration that minimizes displacement at the cutting edge during machining operations

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the cutting insert is attached to the holder using a fastening bolt, then the cutting insert is secured, but positional deviation occurs at the cutting edge

Engineering Contradiction:

Improveattachment reliabilityVSAvoidcutting edge position accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The asymmetric arrangement of fitting portions with the third central angle being smaller creates an optimized attachment geometry that works synergistically with the fastening bolt to secure the cutting insert while minimizing positional deviation of the cutting edge

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The fitting portions are pre-configured with specific angular relationships before attachment to the holder. This preliminary geometric configuration ensures that when the fastening bolt secures the insert, the cutting edge maintains accurate position with minimal deviation during machining

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11484949B2Cutting insert and cutting tool

Publication Date: 2022.11.01 SUMITOMO ELECTRIC HARDMETAL CORP

AI summary

A cutting insert includes a cylindrical body portion, a cutting portion, a first fitting portion, a second fitting portion, and a third fitting portion. The cutting portion includes a rake face and a flank face. A ridgeline between the rake face and the flank face constitutes a cutting edge. When viewed in the axial direction, the cutting portion is provided opposite to the third fitting portion relative to the insertion hole. When viewed in the axial direction, a straight line extending through an outer circumferential end of the cutting edge and a center of the insertion hole overlaps with the third fitting portion and is located between the first fitting portion and the second fitting portion. A third central angle is smaller than a first central angle and is smaller than a second central angle.