Nickel-Chromium FSW Tool Holder for PCBN Insert Retention

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Solution Overview

Problem

Existing PCBN tool inserts face challenges in retaining their position within the tool holder during friction stir welding of high-temperature alloys due to thermal mismatch and traditional retention methods failing under extreme conditions, limiting weld length and feasibility for thicker plates.

Innovation Solution

A friction stir welding tool holder made of nickel-chromium based alloy, combined with a retention mechanism featuring a locking collar and anti-rotation features, and optionally a braze layer and cooling system, ensures secure attachment of the PCBN tool insert within the holder.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional retention methods (screws) are used to attach PCBN tool insert to tool holder, then the tool insert can be retained in the tool holder, but the retention fails under extreme FSW conditions due to thermal mismatch and high temperatures

Engineering Contradiction:

Improveretention reliabilityVSAvoidthermal mismatch

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces traditional mechanical retention methods (screws) with a friction-based retention mechanism. The tool holder is designed with a friction fit interface that utilizes radial expansion under thermal conditions to create secure retention of the PCBN tool insert without mechanical fasteners, thereby eliminating the thermal mismatch problem associated with screw connections.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs parameter changes by designing the tool holder with specific geometric parameters (radial expansion capability, friction surface characteristics) that allow the retention mechanism to adapt to thermal conditions. The friction fit interface is engineered to maintain optimal retention force across the temperature range experienced during FSW operations.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If PCBN tool inserts are used for high temperature alloys, then welding capability is improved, but the tool insert size is limited to 12 mm pin height due to HPHT press limitations

Engineering Contradiction:

Improvewelding temperature capabilityVSAvoidtool insert pin height

Core Design Contradiction:

TemperatureVSLength of moving object

Solution Approach 1:

The patent applies segmentation by dividing the tool insert into multiple stacked PCBN elements rather than requiring a single monolithic block. This allows the construction of taller tool inserts (greater than 12 mm pin height) by assembling multiple smaller PCBN components, overcoming the HPHT press size limitations while maintaining the high-temperature welding capability.

Inventive Principle:

Principle #1Segmentation

3Length of moving object

If larger PCBN blocks are used to create taller tool inserts, then weld length capability is improved, but material homogeneity is compromised due to HPHT press limitations

Engineering Contradiction:

Improvetool insert pin heightVSAvoidmaterial homogeneity

Core Design Contradiction:

Length of moving objectVSStability of the object's composition

Solution Approach 1:

The patent uses segmentation to create taller tool inserts from multiple smaller PCBN elements, each of which can be manufactured with consistent material homogeneity within HPHT press capabilities. The segmented construction avoids the need for excessively large monolithic blocks that would compromise material uniformity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite construction by assembling multiple PCBN elements into a unified tool insert structure. This composite approach allows the combination of multiple homogeneous materials to achieve the desired overall dimensions while maintaining material consistency throughout the structure.

Inventive Principle:

Principle #40Composite materials

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

Enhances the retention of PCBN tool inserts during welding, allowing for longer welds and the ability to weld thicker plates by reducing thermal stress and peak stresses, while providing cost-effective and durable solutions.

Implementation Method 1

a friction stir welding (FSW) tool holder with a nickel-chromium based alloy

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the rotation of the tool creates frictional and viscous heating of the workpieces

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 3

the rotation of the tool creates frictional and viscous heating of the workpieces

Methodology Applied

Scientific EffectViscous heating: Viscous Heating

Data Source

PatentUS12383976B2Friction stir welding tool holder

Publication Date: 2025.08.12 ELEMENT SIX (UK) LTD

AI summary

This disclosure relates to a friction stir welding (FSW) tool holder comprising a nickel-chromium based alloy.