Composite Leaf Spring Structure for Ultrasonic Sonotrode Durability
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Solution Overview
Problem
Ultrasonic machining apparatuses with leaf springs made from fiber-reinforced plastic face material cracks and breakage due to high alternating loads during long-term operation, leading to reduced service life.
Innovation Solution
The use of carbon fiber-reinforced plastic leaf springs with an anisotropic distribution of modulus of elasticity, oriented at 45° to the sides, and reinforcement in the clamping region, along with varying fiber layer thickness and orientation, minimizes bending stresses and enhances durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If leaf springs are made from fiber-reinforced plastic for ultrasonic machining apparatus, then the service life is improved, but the material is subject to strong alternating loads that cause cracks and breakage
Solution Approach 1:
The patent applies composite materials by using fiber-reinforced plastic for the leaf springs, combining the benefits of plastic material with the strength and stiffness of carbon fibers. This composite structure provides both the necessary mechanical properties for long-term operation and resistance to the strong alternating loads that cause failure in conventional materials.
Solution Approach 2:
The patent implements local quality by creating an anisotropic distribution of the modulus of elasticity within the leaf spring structure. Different regions of the leaf spring have different fiber orientations and material properties optimized for their specific functional requirements, allowing the structure to better distribute and withstand alternating loads in different directions.
2Adaptability or versatility
If the modulus of elasticity is lower in the thickness direction than transverse direction, then the adaptation to application is improved, but high bending stresses occur in the plane of the leaf springs
Solution Approach 1:
The patent applies local quality by implementing an anisotropic modulus of elasticity distribution where the material properties vary in different directions. The fiber reinforcement is oriented to provide lower stiffness in the thickness direction (allowing necessary deflection) while maintaining higher stiffness in the transverse direction (resisting bending stresses), thus adapting the material behavior to the specific loading conditions of the ultrasonic machining application.
Solution Approach 2:
The patent changes the material parameters by controlling the fiber orientation and distribution in the composite structure. By adjusting the fiber angles and layers during manufacturing, the modulus of elasticity is tailored to have different values in different directions, optimizing the balance between adaptability to the application and resistance to bending stresses.
3Strength
If carbon fiber-reinforced plastic with anisotropic modulus distribution is used, then bending stresses are reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent uses composite materials with specifically oriented carbon fibers to reduce bending stresses. The anisotropic fiber arrangement is integrated into the manufacturing process, where layers of carbon fiber reinforcement are placed at specific angles during composite layup, allowing the stress-reducing structural features to be built in during standard composite manufacturing procedures.
Solution Approach 2:
The patent implements local quality through targeted fiber orientation in specific regions of the leaf spring. Rather than requiring complex global structural modifications, the manufacturing process places fibers at specific angles (such as ±45°) in critical stress regions, achieving stress reduction through localized material property optimization that can be accomplished during standard composite fabrication.
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 design significantly extends the service life of the sonotrode by reducing bending stresses and distributing loads effectively, allowing for high-frequency operation with reduced material fatigue.
Implementation Method 1
the leaf springs are manufactured from carbon fiber-reinforced plastic and have an anisotropically distributed modulus of elasticity
Data Source
AI summary
In an ultrasonic machining apparatus having leaf springs composed of fiber-reinforced plastic, the leaf springs are provided with a reinforcement in the region of a clamping.