Cavitation Intensification Conditioner for Deep Residual Stress

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Solution Overview

Problem

Current surface enhancement methods, such as shot peening and cavitation peening, face limitations including shallow compressive stress depth, surface damage, high costs, and restricted applicability due to equipment complexity and limited process rates, particularly in generating intense residual stresses and efficiently cleaning or roughening surfaces.

Innovation Solution

The use of a submerged pressurized liquid jet with a cavitation intensification conditioner oriented parallel to the jet, creating a low-pressure region to enhance cavitation intensity, allowing for deeper and more intense residual stress generation without surface damage, and enabling broader application across various materials and geometries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional cavitation peening is used to generate compressive residual stresses, then surface enhancement is achieved, but stress depth and stress intensity are limited

Engineering Contradiction:

Improvecompressive residual stress intensityVSAvoidstress depth penetration

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the physical parameters of the liquid jet system by increasing jet pressure to ultra-high levels (10,000-100,000 psi), adjusting jet velocity, and modifying cavitation bubble dynamics to achieve deeper stress penetration and higher stress intensity that overcomes traditional cavitation peening limitations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the periodic collapse of cavitation bubbles to generate repeated shock waves that penetrate deeper into the material, accumulating compressive residual stresses at greater depths through multiple cyclic loading events rather than single-impact methods

Inventive Principle:

Principle #19Periodic action

2Productivity

If high-pressure liquid jets are used for surface processing, then processing rate increases, but surface damage occurs

Engineering Contradiction:

Improvesurface processing rateVSAvoidsurface damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses cavitation bubbles as an intermediary medium between the liquid jet and the target surface. The bubbles absorb and distribute the jet energy through controlled collapse, enabling high processing rates while preventing direct liquid jet contact that would cause surface damage

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical impact of the liquid jet with a cavitation-mediated energy transfer mechanism, where acoustic and pressure wave effects substitute for direct fluid mechanical contact, reducing harmful surface erosion while maintaining processing efficiency

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If shot peening is used to generate compressive residual stresses, then surface strength improves, but equipment complexity and cost increase

Engineering Contradiction:

Improvesurface strengthVSAvoidequipment complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent uses hydraulic principles to generate ultra-high pressure liquid jets through pump systems, replacing complex pneumatic shot peening equipment with a more compact and controllable hydraulic-cavitation system that achieves similar or superior surface strengthening with reduced equipment complexity

Inventive Principle:

Principle #29Pneumatics and hydraulics

4Loss of substance

If conventional cleaning methods are used to remove coatings and scale, then surface preparation is achieved, but processing time increases

Engineering Contradiction:

Improvecoating removal efficiencyVSAvoidprocessing time

Core Design Contradiction:

Loss of substanceVSLoss of time

Solution Approach 1:

The patent exploits the phase transition of liquid to cavitation bubbles and back to liquid during collapse to create intense localized cleaning action. The repeated phase change generates micro-shock waves and jetting effects that rapidly remove coatings and scale, dramatically reducing processing time compared to conventional mechanical or chemical cleaning methods

Inventive Principle:

Principle #36Phase transitions

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 approach significantly increases processing rates and stress intensity, enabling effective surface cleaning, coating removal, and residual stress induction in metals, ceramics, glass, composites, and plastics, while minimizing surface damage and reducing equipment costs, with the ability to operate at various angles and in confined spaces.

Implementation Method 1

cavitation bubbles collapse and shock waves pass into the material

Methodology Applied

Scientific EffectCavitation: Cavitation

Implementation Method 2

shock waves pass into the material

Methodology Applied

Scientific EffectShock wave: Shock Wave

Data Source

PatentUS9050642B2Method and apparatus for surface enhancement

Publication Date: 2015.06.09 ORMOND LLC

AI summary

Systems and methods for generating beneficial residual stresses in a target material by generating cavitation shock waves through the use of a cavitation intensification conditioner. Shock waves emanate through the target material from collapsing cavitation voids in a liquid jet to generate residual stresses without significantly deforming the surface of the target material. A high pressure liquid is accelerated through a submerged peening nozzle to generate a high-speed liquid cavitating jet that is further intensified and controlled by use of the cavitation intensification conditioner.