Ultrasonic Manipulator for 3D Composite Preform Cutting
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Solution Overview
Problem
Current methods for cutting and forming three-dimensional fiber composite parts are inefficient, leading to distorted cut surfaces, blade wear, and the generation of hazardous debris, with no reliable technique available for cutting thick composite tapes or fiber bundles.
Innovation Solution
An ultrasonic manipulator system with a multi-function end effector capable of ultrasonic cutting, machining, bonding, and inspection is used to process three-dimensional composite preforms, allowing for precise cutting, shaping, and assembly of preforms without distortion or debris generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If carbide blades are used to cut composite material, then cutting capability is achieved, but cut surfaces become distorted and blades wear periodically
Solution Approach 1:
The patent replaces traditional mechanical carbide blade cutting with ultrasonic vibration cutting. The ultrasonic cutter uses high-frequency mechanical vibrations (20 kHz or higher) to fracture and remove composite material without the continuous contact and shear forces that cause distortion and wear in conventional mechanical cutting. This substitution resolves the contradiction by achieving clean cuts without blade wear.
Solution Approach 2:
The invention applies ultrasonic vibration (mechanical vibration at frequencies above 20 kHz) to the cutting tool to enable precise cutting of composite materials. The high-frequency vibrations create micro-fractures and reduce cutting forces, allowing clean separation of material without the distortion and wear associated with conventional mechanical cutting blades.
2Productivity
If rotary cutting methods are used, then cutting speed is improved, but significant debris and airborne particulates are generated
Solution Approach 1:
The patent replaces rotary mechanical cutting with ultrasonic vibration cutting. This substitution eliminates the high-speed rotation that generates significant debris and airborne particulates. The ultrasonic cutter removes material through controlled micro-fractures caused by high-frequency vibrations, producing minimal debris and no hazardous airborne particulates while maintaining efficient cutting speeds.
3Manufacturing precision
If ultrasonic cutters are used to cut flat sheets, then clean cuts are achieved without blade wear, but the method cannot cut thick composite tapes or fiber bundles
Solution Approach 1:
The invention transitions from static ultrasonic cutting of flat sheets to dynamic ultrasonic cutting of thick 3D composite forms. The ultrasonic manipulator with multi-axis positioning and programmable motion control enables the cutter to follow complex three-dimensional paths, adapt to varying material thicknesses, and cut thick composite tapes and fiber bundles while maintaining the clean cut quality characteristic of ultrasonic cutting.
Solution Approach 2:
The ultrasonic manipulator system is designed as a multi-functional device that can cut, shape, and assemble three-dimensional composite preforms. This universal system replaces multiple specialized tools, enabling both flat sheet cutting and thick 3D form cutting with the same ultrasonic technology platform, thereby resolving the limitation of ultrasonic cutters being restricted to two-dimensional applications.
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
Enables reliable and repeatable cutting, shaping, and assembly of three-dimensional composite preforms, reducing blade wear and hazardous debris, while ensuring high-quality inspection and bonding for efficient composite part manufacturing.
Implementation Method 1
Ultrasonic cutting enables clean cuts to be made without requiring high forces. This results in less wear on the cutting blades and distortion of the cut surfaces.
Implementation Method 2
welding the first part to the second part via an ultrasonic welder to form a thermoplastic composite article
Implementation Method 3
picking up the part by applying a vacuum force to the part
Data Source
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AI summary
An ultrasonic manipulator (100) for processing three-dimensional composite preforms (124) is provided, including at least one end effector (102), the end effector having an ultrasonic cutting device (104), an ultrasonic machining device (106), an ultrasonic inspecting device (108), and an ultrasonic bonding device (110). A method for creating three-dimensional preforms for use in molding composite parts is also provided, and includes the steps of grasping a preform/ towpreg, inspecting the composite object using ultrasound, cutting a preform from the composite object using ultrasound, and at least some of the steps of shaping the preform using ultrasound, machining the preform using ultrasound, assembling a plurality of preforms, bonding the assembled preforms together to create a preform charge, and placing the preform charge in an injection mold.