Rotationally Symmetric Cutting Insert for Faster Edge Replacement

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Solution Overview

Problem

Existing cutting tools require complex and time-consuming processes for replacing cutting edges, especially when dealing with multiple inserts or small-diameter screws, which affects efficiency and stability.

Innovation Solution

A cutting insert design featuring a first and second end surface with rotational symmetry, inclined surface parts, and peripheral side surfaces that allow for stable fixation without complete separation from the holder, enabling easy rotation for edge replacement using a pin with a female thread for screwing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixation method involving wedge members or clamps is used, then the cutting insert can be fixed to the holder, but the replacement time increases significantly

Engineering Contradiction:

Improvefixation stabilityVSAvoidreplacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The cutting insert is segmented into multiple parts: a body portion with cutting edges and a separate pressing portion with inclined surfaces. This segmentation allows the pressing portion to be independently engaged with the holder's pressing member, enabling quick release and replacement of the cutting edge without moving the entire insert, thus reducing replacement time while maintaining fixation stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pressing portion is designed with inclined surfaces that allow dynamic engagement and disengagement with the pressing member. By tilting the pressing portion relative to the holder's pressing surface, the insert can be quickly released and repositioned without requiring complete removal, enabling rapid replacement while maintaining secure fixation during cutting operations.

Inventive Principle:

Principle #15Dynamics

2Reliability

If a through hole is provided in the cutting insert for fixation, then the insert can be secured to the holder, but the shape stability is degraded

Engineering Contradiction:

Improvefixation stabilityVSAvoidshape stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The through hole for fixation is extracted from the main body of the cutting insert and relocated to the separate pressing portion. This extraction allows the fixation feature to be positioned away from the critical cutting edges and main structural body, maintaining the shape stability and structural integrity of the cutting insert while still providing secure fixation through the pressing member engagement.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If the cutting insert is completely separated from the holder for edge replacement, then any cutting edge can be accessed, but the replacement process becomes complicated and time-consuming

Engineering Contradiction:

Improveedge replacement easeVSAvoidreplacement time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11110527B2Cutting insert and cutting tool

Publication Date: 2021.09.07 TUNGALOY CORP

AI summary

A cutting insert 10 comprises a peripheral side surface 16 comprising a plurality of peripheral side surface parts 16A-16H formed so as to be in rotational symmetry with respect to a central axis AX. In the cutting insert 10, a second end surface 14 is provided with a plurality of inclined surface parts 13A-13H formed so as to be in rotational symmetry with respect to the central axis AX and to be recessed from a peripheral edge part 14A.