Cutting Insert Lip Support for Edge Strength and Seating Stability

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Solution Overview

Problem

Cutting inserts for drilling tools face a challenge in balancing increased seating surface area for stability with maintaining sufficient strength of the cutting edge, as larger seating surfaces can compromise the strength of the cutting edges.

Innovation Solution

The design incorporates a lip support surface that extends from the transition between the cutting lip and the seating surface, providing additional structural support while maximizing the seating surface area for stability, featuring a convex second cutting edge and a lip support that reduces the likelihood of cutting lip damage during drilling operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the size of the seating surface is increased to reduce the risk of twisting of the cutting insert, then the stability of the cutting insert is improved, but the strength of the cutting edges decreases

Engineering Contradiction:

Improvestability of cutting insertVSAvoidstrength of cutting edges

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The side surface is segmented into three distinct functional zones: a first seating surface portion for primary contact and stability, a second seating surface portion with greater area for enhanced support, and a corner surface connecting adjacent sides. This segmentation allows each zone to contribute differently to overall performance without compromising cutting edge strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the seating surface are designed with different area characteristics - the first portion provides localized stable contact while the second portion offers broader support. This local differentiation optimizes both stability and cutting edge strength by placing support where needed without uniformly reducing material available for cutting edges.

Inventive Principle:

Principle #3Local quality

2Reliability

If the seating surface area is increased to provide additional support, then the reliability of the cutting insert is improved, but the strength of the cutting edges is compromised

Engineering Contradiction:

Improvereliability of cutting insertVSAvoidstrength of cutting edges

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The seating surface is divided into multiple segments with different area characteristics, allowing the insert to achieve reliable support through distributed contact areas rather than a single large surface that would compromise cutting edge geometry.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The corner surface connects adjacent side surfaces in three-dimensional space, adding a dimensional element that provides additional support pathways without reducing the cutting edge area on any single face.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20230286064A1Cutting insert with seating surface and lip support

Publication Date: 2023.09.14 KENNAMETAL INC

AI summary

The present invention provides a cutting insert with a lip support providing additional support for the cutting insert. The cutting insert may be secured to a pocket of a drilling tool. The cutting insert may include a front surface, rear surface, and side surfaces. Cutting edges may form at the intersection of the side surfaces and the front surface. A cutting lip may extend rearwardly from the cutting edges with a seating surface under the cutting lip. The transition between the seating surface and the cutting lip may include two chamfers separated by a lip support.