Frustoconical Cutting Tip Threaded Connection

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Solution Overview

Problem

Existing cutting tools with threaded connections face challenges in minimizing friction and preventing damage from radial and axial forces during machining operations, which can lead to inaccuracies and rejection of expensive workpieces.

Innovation Solution

The use of frustoconical supporting and threaded portions on cutting tips and holders reduces friction and damage by distributing forces through non-threaded surfaces, allowing for precise positioning and secure attachment with reduced risk of thread damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If threaded connections are used to attach cutting tips to holders, then secure attachment and positioning are achieved, but friction and damage to threads occur during machining operations

Engineering Contradiction:

Improveattachment strengthVSAvoidthread damage from radial and axial forces

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The mounting portion is segmented into two distinct functional zones: a frustoconical supporting surface for bearing radial and axial forces, and a frustoconical threaded portion for providing secure attachment. This segmentation allows each zone to perform its specific function without the threads being subjected to damaging forces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The frustoconical supporting surface acts as an intermediary element between the cutting tip and holder, bearing the radial and axial forces that would otherwise be transmitted to the threaded connection. This mediator protects the threads from damage while maintaining secure attachment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If conventional threaded connections are used, then cutting tips can be attached to holders, but friction between threads increases during operation

Engineering Contradiction:

Improvethreaded connection functionalityVSAvoidfriction between threaded portions

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The frustoconical supporting surface establishes preliminary contact and load-bearing capability before the threaded portions engage. This preliminary action ensures that forces are borne by the supporting surface rather than the threads, reducing friction during operation.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If axial displacement of cutting inserts occurs relative to toolholder, then positioning accuracy is compromised, but preventing displacement may increase complexity of connection mechanism

Engineering Contradiction:

Improvepositioning accuracy of cutting insertVSAvoidconnection mechanism complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The invention merges the positioning and attachment functions into a single integrated frustoconical interface. The frustoconical supporting surface provides both radial positioning and axial location, while the frustoconical threaded portion secures the connection, eliminating the need for separate positioning and attachment mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7374376B2Cutting tool

Publication Date: 2008.05.20 SECO TOOLS AB

AI summary

The present invention relates to a replaceable cutting tip and, more particularly, to such cutting tips attachable to the cutting tip holders by a threaded connection. The cutting tip for a cutting tool includes a working end portion disposed along an axis of the cutting tip and including one or more cutting edges for machining a workpiece, and a mounting portion disposed along the axis of the cutting tip. The mounting portion includes a frustoconical supporting surface tip portion and a frustoconical threaded portion. The present invention also relates to a cutting tool per se.