Cutting Insert Recessed Supporting Surface Wear Seating

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Solution Overview

Problem

Cutting inserts often face issues with improper seating due to wear on the clearance surfaces, which can prevent them from functioning correctly in toolholders, especially when the toolholder material is softer than the insert.

Innovation Solution

A cutting insert design featuring a recess with an insert supporting surface that contacts a protruding abutment surface, allowing for proper seating regardless of wear, and a toolholder with a pocket containing a first and second abutment surface to securely hold the insert, minimizing the impact of wear on the insert's clearance surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the insert supporting surface is made as a clearance surface, then the insert can be mounted in the toolholder pocket, but wear on the clearance surface prevents proper seating of the insert

Engineering Contradiction:

Improveinsert mountingVSAvoidinsert seating accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The insert supporting surface is segmented into two distinct surfaces: a clearance surface for initial mounting and an abutment surface for final precise seating. This segmentation allows each surface to serve its specific function optimally - the clearance surface facilitates easy insertion while the abutment surface ensures accurate positioning regardless of wear on the clearance surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The abutment surface is designed to engage the insert before the clearance surface during the mounting process. This preliminary action by the harder abutment surface establishes proper seating accuracy before the softer clearance surface makes contact, preventing wear-related seating issues.

Inventive Principle:

Principle #10Preliminary action

2Ease of manufacture

If the toolholder body material is softer than the insert, then the toolholder is easier to manufacture, but the walls of the pocket may undergo plastic deformation during cutting

Engineering Contradiction:

Improvetoolholder manufacturingVSAvoidpocket wall deformation resistance

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The toolholder employs a composite construction combining a softer toolholder body material (easier to manufacture) with a harder pin material (deformation resistant). The pin, made from material harder than both the insert and toolholder body, is inserted into the pocket to specifically reinforce the abutment surface area, creating a functional composite structure that addresses both manufacturing ease and deformation resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Instead of making the entire toolholder from hard material (which would be difficult to manufacture), the harder material is applied locally only where needed - on the pin forming the abutment surface. This local quality enhancement provides deformation resistance at the critical contact point while maintaining ease of manufacture for the rest of the toolholder body.

Inventive Principle:

Principle #3Local quality

3Strength

If the pin material is harder than the toolholder body, then plastic deformation of the pocket walls is avoided, but the pin may damage the softer toolholder material

Engineering Contradiction:

Improvepocket wall deformation resistanceVSAvoiddamage to toolholder material

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The design carefully balances the hardness parameters of the three materials involved. The pin is made harder than the toolholder body to prevent deformation, but the overall hardness parameter is controlled to avoid excessive damage. The abutment surface geometry and contact area are also optimized to distribute loads, reducing stress concentration that could cause damage despite the hardness difference.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2403675B1Cutting insert with recessed insert supporting surface, and cutting tool

Publication Date: 2016.06.01 SECO TOOLS AB

Figure 1~2
Figure 3A~6
Figure 3B~11

AI summary

A cutting insert includes a first chip surface, a second surface on an opposite side of the insert from the first chip surface, and a side surface extending between the first chip surface and the second surface, at least part of one first cutting edge being defined by an intersection of the side surface with the first chip surface. The side surface includes at least one recess, the recess including an insert supporting surface for supporting the insert relative to a protruding abutment surface on a toolholder and a flat auxiliary insert supporting surface for supporting the insert relative to a non-protruding, flat abutment surface. A cutting tool is also provided.