Metal-Cutting Tool Adjusting Element Retention

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Solution Overview

Problem

Existing fine machining tools with indexable inserts face challenges in securely retaining the adjusting element, particularly when the insert is removed or replaced, due to the risk of the wedge element falling out of the tool holder recess.

Innovation Solution

A metal-cutting tool design that incorporates a threaded element fixed in the tool holder, allowing the adjusting element to be securely attached as an undetachable part, enabling both radial and axial position adjustments of the cutting plate, with a radial projection engaging in a recess on the tool holder to ensure secure retention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the adjusting element is designed to be detachable for easy insertion and removal, then the ease of operation is improved, but the reliability deteriorates because the adjusting element may fall out when the indexable insert is removed or replaced

Engineering Contradiction:

Improveease of insertion and removalVSAvoidsecure retention of adjusting element

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The adjusting element is segmented into two functional parts: a wedge element for radial positioning and a threaded element for axial positioning. The threaded element has a projection that engages with a corresponding recess in the tool holder, creating a detachable yet secure connection that prevents the adjusting element from falling out while allowing controlled removal when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The projection of the threaded element is nested within the recess of the tool holder, creating an interlocking mechanism. This nesting arrangement ensures that the adjusting element remains securely retained during normal operation but can be deliberately removed when the indexable insert is changed, balancing reliability with ease of operation.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the adjusting element is securely retained as an undetachable part, then the reliability is improved, but the ease of operation deteriorates because the adjusting element cannot be easily removed when the insert is replaced

Engineering Contradiction:

Improvesecure retention of adjusting elementVSAvoidremoval of adjusting element

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The retaining mechanism transitions from a static undetachable design to a dynamic conditional retention system. The projection-recess arrangement provides secure retention during normal use but allows controlled detachment when the indexable insert is removed, enabling the adjusting element to switch between secured and removable states based on operational requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The projection on the threaded element acts as an intermediary mechanism between the adjusting element and the tool holder. It provides secure retention through engagement with the recess while simultaneously enabling controlled removal, serving as a mediator that balances the conflicting requirements of reliability and ease of operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the threaded element is positioned eccentrically or non-coaxially, then the reliability of retention is improved, but the device complexity increases

Engineering Contradiction:

Improvesecure retention of threaded elementVSAvoidpositioning of threaded element

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The threaded element is deliberately positioned eccentrically or non-coaxially relative to the recess, creating an asymmetric engagement geometry. This asymmetric positioning ensures that the projection engages securely with the recess while preventing accidental disengagement, improving retention reliability. The increased manufacturing precision required for this asymmetric positioning is offset by the enhanced reliability and simplified overall design compared to more complex retention mechanisms.

Inventive Principle:

Principle #4Asymmetry

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enhances the secure retention of the adjusting element, preventing it from disengagement during insert removal or replacement, allowing for precise and stable adjustments of the cutting plate's position, even during tool rotation or use against a rotating workpiece.

Implementation Method 1

the screw-fastening means comprise a threaded element which interacts with the adjusting element

Methodology Applied

Scientific EffectThreaded fastening: Screw

Implementation Method 2

an oblique face on the wedge element interacting with a correspondingly oblique face on the indexable insert and forming a type of wedge gear

Methodology Applied

Scientific EffectWedge mechanism: Wedge

Implementation Method 3

the threaded element with the projection is inserted into a recess for the adjusting element on the tool holder, so that the projection engages in the cut-out

Methodology Applied

Scientific EffectMechanical engagement: Physical Containment

Data Source

PatentUS9296045B2Metal-cutting tool

Publication Date: 2016.03.29 JOERG GUEHRING

AI summary

There is provided a metal-cutting tool comprising a tool holder, a replaceable cutting plate, and an adjusting element which is attached by means of screw-fastening means elements and with which the position of the cutting plate on the tool holder can be adjusted. The screw-fastening means comprises a threaded element which interacts with the adjusting element and can be fixed in place in the tool holder.