Lamination Stack Adhesive Application With Surface Activation
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Solution Overview
Problem
Existing methods for applying adhesive to laminations in stacks require elaborate application heads with multiple piezo valves, leading to high costs and inconsistent adhesion due to the unpredictable chemical and physical properties of insulation varnishes, which result in insufficient bonding and surface contamination.
Innovation Solution
The method involves rotating laminations about their axis or moving an application head around the lamination's axis to apply adhesive, using a simplified design that allows for a larger adhesive surface area, and incorporating cleaning and activating stations downstream of the punching tool to ensure reliable adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied onto laminations by means of piezo valves in a punctiform fashion, then bonding between laminations is achieved, but the application head requires an elaborate design with a corresponding number of piezo valves, leading to high costs
Solution Approach 1:
The application head is divided into multiple independent application nozzles that can be selectively activated. Instead of using a complex array of piezo valves for every possible lamination position, only the necessary nozzles are activated based on the actual lamination layout, simplifying the overall device design while maintaining reliable bonding.
Solution Approach 2:
The patent changes the application method from punctiform adhesive application using multiple piezo valves to a continuous or semi-continuous application method using simplified nozzles. This parameter change in the application approach reduces device complexity while achieving the same bonding reliability.
2Object-affected harmful factors
If insulation varnishes are used on laminations, then electrical insulation is provided, but the chemical and physical properties are not reproducible, making it impossible to establish sufficient adhesion between adhesive and insulation surface
Solution Approach 1:
The patent introduces preliminary cleaning and/or activating stations that treat the lamination surfaces before adhesive application. This preliminary action removes contaminants and activates the insulation varnish surface, creating a reliable bonding substrate regardless of the varnish's inherent property variations, thus ensuring consistent adhesion.
Solution Approach 2:
The cleaning and activating stations act as intermediary steps between the insulation varnish application and the adhesive bonding. These intermediaries prepare the surface by removing harmful contaminants and enhancing surface energy, enabling reliable adhesion despite the unpredictable properties of the insulation varnishes.
3Area of stationary object
If multiple piezo valves are used for adhesive application, then complete surface coverage can be achieved, but the number of valves increases, leading to higher costs and more elaborate construction
Solution Approach 1:
The application nozzles are designed to serve multiple functions: they can apply adhesive to different lamination positions, adjust application patterns, and work with various lamination configurations. This multi-functionality allows complete surface coverage to be achieved with fewer, more versatile nozzles rather than numerous specialized piezo valves.
Solution Approach 2:
The patent applies adhesive in a manner that ensures complete coverage of the necessary lamination surfaces without requiring excessive numbers of application points. By optimizing the adhesive flow and nozzle positioning, full coverage is achieved with a reduced number of nozzles, avoiding the need for elaborate multi-valve systems.
Data Source
AI summary
A system for producing stacks of laminations by punching out the laminations of a sheet metal strip and applying at least one adhesive onto the laminations with at least one application head, wherein the laminations provided with the at least one adhesive are stacked into a stack of laminations, is provided with at least one punching tool, with which laminations are punched out of a sheet metal material, wherein at least one station for cleaning and/or for activating and/or for applying an adhesive onto the laminations is arranged downstream of the punching tool.