Double-Sided Negative Cutting Insert to Prevent Mounting Errors

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Solution Overview

Problem

Existing double-sided negative cutting inserts with right-hand cutting edges are prone to erroneous mounting in left-hand insert seats, leading to tool failure, and their negative axial tipping-in angle increases cutting difficulty, necessitating a design that counteracts these issues.

Innovation Solution

A double-sided negative cutting insert with eight working positions, featuring main cutting edges inclined away from adjacent corner edges and symmetrical side surfaces, ensuring right-hand and left-hand cutting edges are positioned correctly, reducing the risk of mounting errors and mitigating the negative axial tipping-in angle effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a double-sided negative cutting insert with right-hand cutting edges is used, then the cutting insert can be mounted in right-hand insert seats, but it is prone to erroneous mounting in left-hand insert seats leading to tool failure

Engineering Contradiction:

Improvecompatibility with right-hand insert seatsVSAvoidrisk of tool failure due to erroneous mounting

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The cutting insert employs asymmetric design where the first and second main side faces have different configurations - the first main side face has a first corner side face between the first and fourth main side faces, while the second main side face has a second corner side face between the second and third main side faces. This asymmetry creates geometric compatibility only with the corresponding hand-specific insert seat, preventing erroneous mounting in the wrong hand insert seat.

Inventive Principle:

Principle #4Asymmetry

2Shape

If a negative axial tipping-in angle is given to the cutting insert, then relief is created behind the active surface-wiping cutting edge, but the cutting process becomes heavier and more difficult

Engineering Contradiction:

Improverelief behind cutting edgeVSAvoiddifficulty of cutting process

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

The invention applies different local qualities to different parts of the cutting insert. The first and second main side faces are configured with specific orientations and angles relative to the cutting edges, creating localized geometric conditions that optimize cutting performance. The first corner side face and second corner side face have different configurations that locally compensate for the negative axial tipping-in angle effects.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4616984A1Double-sided negative cutting insert and milling tool

Publication Date: 2025.09.17 SECO TOOLS AB

Figure 1a~1b
Figure 1c~1d
Figure 1e~1f

AI summary

A double-sided negative cutting insert for use in milling with eight working positions. A peripheral surface extends around the cutting insert (1) and has four main side faces including first and second main side faces (11a, 11b) arranged opposite to each other on opposite sides of the cutting insert and third and fourth main side faces (11c, 11d) arranged opposite to each other on two other opposite sides of the cutting insert. The cutting insert has eight sets of cutting edges, each of which including a main cutting edge, a corner cutting edge and a minor cutting edge. Two flat side surfaces (14a-14d) that are inclined towards each other are provided on each one of the first and second main side faces. The main cutting edges (21a-21h) are arranged along a respective one of said side surfaces on the first and second main side faces and all minor cutting edges (22a-22h) are arranged along the third and fourth main side faces.