Biconcave Indexable Cutting Insert for Narrow Parting Widths

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Solution Overview

Problem

Existing indexable cutting inserts for turning and lathing applications face challenges in achieving shorter lengths and narrower widths while maintaining strength, stability, and heat transport capacity, which are essential for applications like groove-turning and parting-off.

Innovation Solution

The design of an indexable cutting insert with a biconcave cross-section and elliptic cylindrical surfaces allows for a greater width at the cutting edges, enhancing strength and heat transport while reducing material usage and manufacturing costs, and enabling smaller tool holders.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the cutting insert is scaled down to achieve shorter length and narrower width, then the cutting insert can be used for groove-turning and parting-off applications, but the strength and stability of the cutting insert are reduced

Engineering Contradiction:

Improvelength of cutting insertVSAvoidstrength of cutting insert

Core Design Contradiction:

Length of moving objectVSStrength

Solution Approach 1:

The cutting insert employs convex and concave curved surfaces instead of flat surfaces. The base portion has convex curved surfaces on its lateral sides, while the cutting portion has concave curved surfaces. This curvature design allows the cutting insert to maintain strength and stability at reduced dimensions by optimizing stress distribution and structural integrity through the curved geometry.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Length of moving object

If the cutting insert is scaled down to achieve shorter length and narrower width, then the cutting insert can be used for groove-turning and parting-off applications, but the heat transport capacity from the cutting edge is reduced

Engineering Contradiction:

Improvewidth of cutting insertVSAvoidheat transport capacity

Core Design Contradiction:

Length of moving objectVSTemperature

Solution Approach 1:

The curved surfaces (convex on base portion, concave on cutting portion) create optimized heat pathways that facilitate efficient heat transport from the cutting edge to the tool holder. The curvature geometry enhances thermal conduction by providing continuous, optimized heat flow paths that maintain effective heat dissipation even in reduced-size inserts.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Duration of action of moving object

If the number of cutting edges is increased, then the indexable cutting insert can be used longer, but the minimal size of the cutting insert must be greater

Engineering Contradiction:

Improveservice life of cutting insertVSAvoidminimal size of cutting insert

Core Design Contradiction:

Duration of action of moving objectVSLength of moving object

Solution Approach 1:

The cutting insert is designed with multiple cutting edges (at least two, preferably three or four) distributed around the cutting portion. Each cutting edge can be indexed to a new position on the tool holder, allowing the insert to be reused multiple times. The segmented structure with multiple functional edges maximizes service life while maintaining compact dimensions through efficient spatial arrangement.

Inventive Principle:

Principle #1Segmentation

4Quantity of substance

If the cutting width is reduced by 25-35%, then material usage and manufacturing costs are reduced, but the strength and stability of the cutting insert are compromised

Engineering Contradiction:

Improvematerial usageVSAvoidstrength of cutting insert

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The curved surface geometry optimizes material distribution to provide maximum strength with minimum material. The convex-concave curvature profile creates structurally efficient forms that maintain high strength-to-weight ratios, enabling 25-35% material reduction while preserving structural integrity and mechanical properties through optimized geometric configuration.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS20220134444A1Indexable cutting insert

Publication Date: 2022.05.05 WHIZCUT OF SWEDEN AB

AI summary

The proposed technology relates to an indexable cutting insert (10) for a cutting tool. The cutting insert (10) comprises: a first side surface (12) and an opposing second side surface (14), and a peripheral surface (16) extending between the first side surface (12) and the second side surface (14). The cutting portion (18) comprises a first cutting face (24) and an opposing second cutting face (26), a flank face (28) extending between the first cutting face (24) and the second cutting face (26), a first cutting edge (20) between the first cutting face (24) and the flank face (28), and a second cutting edge (22) between the second cutting face (26) and the flank face (28). The cutting portion (18) is bisected by a first plane (AA′) transverse to the first side surface (12) and the cutting portion (18) has a biconcave cross-section transverse to the first plane (AA′).