Multiaxial Vibration Peening for Uniform Compressive Stress
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Solution Overview
Problem
Conventional shot peening methods lack control over shot impact density and uniformity, resulting in inconsistent compressive residual stress distribution on aerospace components, which affects their fatigue life.
Innovation Solution
A method and system for controlled peening involving a vibrating tool with controlled vibrational motion, aligned and moved in multiple axes to ensure consistent impact and formation of compressive residual stresses, allowing for precise control over peening characteristics such as impact depth, intensity, and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional shot peening is used, then compressive residual stress can be created on the surface, but the impact density and intensity cannot be controlled uniformly across the surface
Solution Approach 1:
The patent applies mechanical vibration to the peening medium (shots or particles) to enhance their impact characteristics. The vibration is introduced through a transducer that couples to the peening medium container or directly to the shots, causing them to vibrate at controlled frequencies and amplitudes. This vibration ensures uniform distribution and consistent impact energy across the workpiece surface, resolving the contradiction by providing both compressive stress creation and uniformity control.
Solution Approach 2:
The patent changes the physical parameters of the peening process by introducing vibrational motion to the peening medium. By controlling vibration frequency, amplitude, and duration, the system can precisely control impact density and intensity distribution. This parameter change allows uniform compressive residual stress to be achieved across the entire surface while maintaining ease of operation through controllable vibration parameters.
2Reliability
If conventional shot peening is used, then surface treatment can be achieved, but the process is not well-controlled and consistency cannot be guaranteed
Solution Approach 1:
The introduction of mechanical vibration through a transducer provides a reliable and consistent peening process. The vibration ensures that peening media are uniformly distributed and deliver consistent impact energy with each strike. This enhances reliability and consistency of the peening process while the added device complexity is minimal, involving only the vibration transducer and its control system.
3Force
If traditional peening methods are used, then surface compressive stress can be created, but the force and depth required are excessive
Solution Approach 1:
The vibration of peening media increases the effectiveness of each impact by enhancing the kinetic energy transfer to the workpiece surface. The vibrational motion causes peening media to strike the surface with greater precision and energy concentration, reducing the total force and depth required to achieve the desired compressive residual stress. This improves productivity by achieving the same or better results with reduced impact parameters.
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
The controlled peening method achieves improved consistency and efficiency in creating compressive residual stresses, reducing the force and depth required compared to traditional methods, suitable for complex geometries and potentially reducing equipment size and post-processing needs.
Implementation Method 1
The tool is configured to vibrate and an effector operatively connected to control the tool. The vibration transducer can be configured to vibrate the tool in a plane parallel to, and/or perpendicular to a longitudinal axis of the tool.
Implementation Method 2
The tool is configured to cause controlled impact between the peening surface and a surface of a workpiece to form a surface layer of the workpiece with compressive residual stresses.
Implementation Method 3
forming a surface layer on a workpiece by impacting a surface with a tool wherein the tool is under control to form compressive residual stresses in the surface layer
Data Source
AI summary
A method for controlled peening includes forming a surface layer on a workpiece by impacting a surface with a tool wherein the tool is under control to form compressive residual stresses in the surface layer. A system for peening a workpiece includes a tool configured to vibrate and an effector operatively connected to control the tool. The tool includes a peening surface. The tool is configured to cause controlled impact between the peening surface and a surface of a workpiece to form a surface layer of the workpiece with compressive residual stresses. The effector is configured to move the tool in multiple axes.