Laminated Damping Structure with Vulcanized Rubber Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Constrained layer dampers with thermoplastic-type viscoelastic cores face delamination issues under harsh conditions, while thermosetting-type adhesives provide high bonding strength but insufficient damping capacity, and vulcanizing rubber in continuous processes is costly and requires expensive equipment with difficulty in thickness control.
Innovation Solution
A method involving applying unvulcanized rubber in solvent to metallic constraining layers with phenolic adhesives, laminating, and heating to vulcanize the rubber and adhesives in a continuous process, achieving higher bonding strength and damping characteristics suitable for high-temperature applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thermoplastic-type viscoelastic core is used, then damping capacity is provided, but bonding strength decreases and delamination occurs under harsh conditions
Solution Approach 1:
The patent uses a composite structure combining thermoplastic viscoelastic material for damping with thermosetting adhesive layers for bonding. The thermoplastic layer (0.5-2.0 mm thick) provides energy dissipation while the thermosetting adhesive layers (0.05-0.5 mm thick) provide strong bonding to metal substrates, creating a composite damping structure that achieves both damping capacity and bonding strength.
Solution Approach 2:
The patent changes the chemical composition and thermal properties of the adhesive layers by using thermosetting materials with specific glass transition temperatures and cross-linking densities. This allows the adhesive to maintain flexibility for bonding while providing thermal stability and strong adhesion under harsh conditions, resolving the contradiction between damping material properties and bonding requirements.
2Strength
If thermosetting-type adhesives are used, then bonding strength is improved, but damping capacity decreases due to high cross-linking density
Solution Approach 1:
The patent segments the damping structure into distinct functional layers: thermoplastic viscoelastic layers for damping, thermosetting adhesive layers for bonding, and metal substrate layers for structural support. This segmentation allows each layer to optimize its specific function without compromising the others, enabling the thermosetting adhesive to provide bonding strength while the thermoplastic layer provides damping capacity.
Solution Approach 2:
The patent applies different material properties to different regions of the damping structure. The thermoplastic layers have high loss factors for damping, while the thermosetting adhesive layers have high bonding strength and thermal stability. This local differentiation of material qualities allows the structure to achieve both strong bonding and effective damping simultaneously.
3Productivity
If continuous vulcanization process is used, then productivity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies the thermosetting adhesive in an uncured state during assembly, allowing the damping structure to be manufactured and assembled before final curing. This preliminary action enables simpler manufacturing processes and easier assembly, with the adhesive being cured to full strength only when needed, thereby reducing device complexity while maintaining productivity.
Solution Approach 2:
The patent enables continuous manufacturing of damping structures by using adhesives that can be applied, assembled, and cured in a continuous process. The thermosetting adhesive maintains workability during assembly and then cures continuously through heat treatment, allowing uninterrupted production and high throughput without requiring complex batch processing equipment.
4Loss of energy
If thick viscoelastic layers are used, then damping capacity is improved, but manufacturing precision decreases due to difficulty in thickness control
Solution Approach 1:
The patent achieves the required damping capacity through a composite structure with multiple layers of thermoplastic and thermosetting materials. By combining multiple thinner layers (each 0.05-2.0 mm) rather than relying on a single thick layer, the structure maintains effective damping while enabling precise thickness control of each individual layer during manufacturing.
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 method produces laminated structures with enhanced bonding strength and vibration damping, suitable for harsh environments and continuous coil coating/lamination processes, offering improved performance over traditional methods.
Implementation Method 1
heating the coiled first and second laminate structures to thereby vulcanize the first layer of rubber
Implementation Method 2
applying a first layer of adhesive to a first constraining layer; applying a first layer of unvulcanized rubber solved in a solvent to the first layer of adhesive
Implementation Method 3
applying a first layer of unvulcanized rubber solved in a solvent
Data Source
AI summary
The present invention provides an improved method of manufacturing constrained layer dampers with a vulcanized rubber viscoelastic core. The method includes the steps of: applying a first layer of adhesive to a first constraining layer; applying a layer of unvulcanized rubber solved in a solvent to the first layer of adhesive to form a first laminate structure; applying a second layer of adhesive to a second constraining layer to form a second laminate structure; laminating the first laminate structure with the second laminate structure; coiling the laminated first and second laminate structures; and increasing the temperature of the coiled first and second laminate structures to thereby vulcanize the layer of rubber.