Balanced Multi-Tip UIG Tooling for Uniform CMC Machining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing ultrasonic impact grinding (UIG) process for machining ceramic matrix composites (CMCs) is limited by low material removal rates due to challenges in achieving efficient and cost-effective machining with high-quality results.
Innovation Solution
A multi-tip ultrasonic impact grinding tool with balanced mass distribution and uniform vibration amplitude across multiple tips, allowing simultaneous machining of multiple features by ensuring uniform vibration amplitude and balanced mass distribution, even when tips of varying lengths and materials are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional single-tip ultrasonic impact grinding is used, then machining quality is maintained, but material removal rate is low
Solution Approach 1:
The tool is segmented into multiple tips (at least two tips) extending from a common tool body, allowing simultaneous machining of multiple features. Each tip can be independently positioned at different locations and orientations, enabling parallel material removal while maintaining the simplicity of a single tool body structure.
Solution Approach 2:
The invention transitions from single-point machining to multi-point machining by adding spatial dimensionality to the tool configuration. Multiple tips are arranged in three-dimensional space around the tool body, enabling simultaneous engagement with different locations on the workpiece surface, thereby increasing material removal rate without proportionally increasing tool complexity.
2Productivity
If multiple tips of varying lengths are used, then simultaneous machining of multiple features is enabled, but vibration amplitude uniformity becomes difficult to maintain
Solution Approach 1:
Each tip is configured with specific local properties including varying lengths, orientations, and positions tailored to its intended machining location. The tips may have different geometries and material compositions optimized for their specific roles, allowing each tip to achieve optimal vibration characteristics for its particular function while contributing to the overall uniform vibration amplitude of the tool assembly.
Solution Approach 2:
The invention utilizes parameter changes in tip configuration (length, orientation, position, material composition) to compensate for the challenges of multi-tip coordination. By carefully adjusting these parameters, the system maintains uniform vibration amplitude across all tips despite their varying geometries, ensuring consistent machining quality across all features being machined simultaneously.
3Adaptability or versatility
If tips are made from different materials, then optimization for specific machining tasks is improved, but mass balancing becomes more difficult
Solution Approach 1:
Different tip materials are selected based on the specific machining requirements of each tip's location and function. For example, harder materials may be used for tips machining abrasive ceramics, while softer materials may be used for tips requiring better ductility. This local optimization of material properties enhances task-specific performance while the overall mass balancing is achieved through careful design of tip geometries and positions.
Solution Approach 2:
The tool body and tip configurations are designed to achieve mass balance by compensating for the varying masses of different material compositions. Heavier tips may be positioned to counterbalance lighter tips, or the tool body geometry is adjusted to provide counterbalancing mass distribution, ensuring uniform vibration characteristics despite the use of diverse tip 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
This approach significantly enhances material removal rates and productivity by enabling simultaneous machining of multiple features on CMCs, particularly SiC/SiC CMCs, used in gas turbine engine components, by maintaining uniform vibration amplitude and balanced mass distribution.
Implementation Method 1
electrical energy input to a transducer is converted to mechanical vibrations along a longitudinal axis at high frequency (usually at 20-40 kHz)
Implementation Method 2
The vibration of the tool causes the abrasive particles held in the slurry between the tool and the workpiece to impact the workpiece surface causing material removal by microchipping
Implementation Method 3
abrasive particles held in the slurry between the tool and the workpiece to impact the workpiece surface causing material removal by microchipping
Data Source
AI summary
A tool for ultrasonic impact grinding apparatus driven to vibrate along a longitudinal axis at an applied operating frequency includes a tool body disposed on the longitudinal axis, a first tip extending from an output end of the tool body, and a second tip extending in parallel to the first tip from the output end of the tool body. The first tip has a first length. The second tip has a second length greater than the first length. A mass of the first and second tip is substantially balanced across the output end of the tool body and with respect to the longitudinal axis.