Electrical Sheet Pack Bonding With Anaerobic Adhesive Curing
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Solution Overview
Problem
Existing methods for producing electrical sheet packs, such as punch stacking and laser welding, adversely affect magnetic properties and increase eddy current losses, while adhesive-based methods face challenges with high energy demand and bond strength.
Innovation Solution
A method involving coating electrical sheet strips with an insulation layer and an anaerobically curing adhesive, followed by rubbing with beryllium- or transition metal-containing surface structures to catalyze curing, ensuring minimal disruption to insulation and achieving strong, efficient bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive-based stacking methods are used to join electrical sheets, then bond strength is improved, but energy demand and cycle time increase
Solution Approach 1:
The invention changes the curing parameter from thermal (heat-based) to chemical (anaerobic curing). By using anaerobically curing adhesives that polymerize in the absence of oxygen when brought into contact with certain metals, the process eliminates the need for high-energy heating steps while maintaining strong bond formation, directly resolving the contradiction between bond strength and energy consumption
Solution Approach 2:
The invention replaces the thermal curing system with a chemical curing system. Instead of using heat (thermal energy) to activate and cure the adhesive, the system uses a chemical reaction between the anaerobic adhesive and metallic surfaces, substituting a high-energy thermal process with a lower-energy chemical process that achieves the same bonding function
2Strength
If conventional adhesive stacking methods are used, then bond strength is improved, but magnetic properties deteriorate
Solution Approach 1:
The invention changes the curing mechanism from thermal to chemical, avoiding the high-temperature heating process that damages magnetic properties. The anaerobic curing occurs at or near room temperature through chemical reaction, preserving the magnetic characteristics of the electrical sheets while achieving adequate bond strength
Solution Approach 2:
The invention substitutes the thermal curing mechanism with a chemical curing mechanism. By replacing heat-based activation with anaerobic chemical polymerization, the process eliminates thermal damage to magnetic properties while maintaining the adhesive bonding function
3Productivity
If adhesive is applied dotwise before final punching, then productivity is improved, but bond strength deteriorates
Solution Approach 1:
The invention changes the adhesive application parameter from dotwise (partial coverage) to full-area coating. By coating the entire surface with anaerobic adhesive before punching, the process maintains high productivity while ensuring complete bonding coverage across the entire lamination surface, resolving the contradiction between stacking speed and bond strength
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 method allows for reliable joining of electrical sheets with preserved magnetic properties and reduced eddy current losses, while maintaining high strength and efficiency, by integrating the adhesive curing process with the punching operation.
Implementation Method 1
rubbing with beryllium- or transition metal-containing surface structures to catalyze curing
Implementation Method 2
coating the electrical sheet strip (19) on one side with an anaerobically curing adhesive
Data Source
AI summary
The invention relates to a method for producing an electrical sheet pack using an anaerobically curing adhesive, to an electrical sheet pack produced or producible by such a method, and to a device for creating an electrical sheet pack of the invention.