Non-Uniform Sonotrode Geometry for Welding Complex Parts
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Solution Overview
Problem
Existing ultrasonic welding technologies face limitations in effectively joining components with complex geometries due to perceived sonotrode design constraints, leading to issues like parasitic modes and potential catastrophic failures.
Innovation Solution
Designing a sonotrode with a non-uniform mass distribution and specific geometry to correspond to the complex part, incorporating slots and additional mass at predetermined locations, and offsetting the energy input to maximize longitudinal excitation and minimize system loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional uniform sonotrode design is used, then the welding process is simple and reliable, but it cannot effectively join components with complex geometries and causes parasitic modes
Solution Approach 1:
The sonotrode is designed with non-uniform mass distribution, where different sections have different masses and geometries tailored to match specific regions of the complex part being welded. This local customization allows the sonotrode to conform to complex geometries while maintaining effective ultrasonic energy transfer at each welding location.
Solution Approach 2:
The sonotrode employs asymmetric mass distribution and geometric configuration rather than uniform symmetry. The mass is strategically concentrated in specific regions to match the part geometry, creating an asymmetric design that enables welding of complex shapes while controlling parasitic vibration modes through careful placement of mass centers.
2Adaptability or versatility
If additional mass is added to the sonotrode to match complex part geometry, then welding of complex geometries is enabled, but the sonotrode becomes unbalanced causing parasitic modes
Solution Approach 1:
The sonotrode design incorporates dynamic balance considerations where mass is added strategically to match the part geometry while maintaining controlled vibration characteristics. The mass distribution is optimized to follow the part contour while preventing excessive parasitic modes that would compromise welding reliability.
Solution Approach 2:
The design optimizes parameters such as mass distribution, moment of inertia, and geometric configuration to achieve a balance between matching complex part geometries and maintaining stable welding performance. By carefully adjusting these parameters, the sonotrode can conform to complex shapes while minimizing parasitic vibration modes.
3Use of energy by moving object
If the sonotrode mass is concentrated to match part geometry, then energy transfer efficiency improves, but transducer failure risk increases due to unbalanced forces
Solution Approach 1:
Mass is concentrated in specific local regions of the sonotrode where it is needed to match the part geometry and maximize energy transfer efficiency at welding locations. This localized mass concentration improves coupling with the workpiece while the overall distribution is controlled to prevent excessive unbalanced forces that would damage the transducer.
Solution Approach 2:
The sonotrode design dynamically balances mass concentration for energy efficiency with transducer protection. By optimizing the distribution of mass along the sonotrode length and cross-section, the design achieves effective energy transfer to complex geometries while maintaining force balance to prevent transducer failure from excessive unbalanced loads.
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 seamless welding of complex geometries by reducing parasitic modes and maintaining resonance, preventing transducer failure and ensuring efficient energy transfer.
Implementation Method 1
The transducer converts high-frequency electrical signals to high-frequency mechanical vibrations using the piezoelectric effect
Implementation Method 2
Ultrasonic welding is a well-known industrial process wherein high-frequency ultrasonic acoustic vibrations are locally applied to work pieces that are being held together under pressure for the purpose of creating a solid-state weld
Implementation Method 3
All three elements of the stack are specifically tuned to resonate at the same ultrasonic frequency
Data Source
AI summary
An ultrasonic welding system, comprising at least one sonotrode configured to ultrasonically weld a part or component having a complex geometry, wherein, the at least one sonotrode has a shape generally corresponding to the shape of the part or component to be welded, and wherein the sonotrode includes an input face; an energy input located on the input face; an output face positioned opposite the input face; and a body positioned between the input face and the output face; and wherein the at least one sonotrode has a non-uniform distribution of mass.