Solvent-Reactivated Adhesive Lamination Stack

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Solution Overview

Problem

The existing methods for manufacturing bundles of sheets for laminated armatures of electromagnetic machines are complex due to the need for equipment integration for welding, riveting, or complex stapling, and adhesive application, which can lead to dimensional inaccuracies and operational challenges.

Innovation Solution

A method involving the application of a reactivatable adhesive on metal strips, where the adhesive is dried and then reactivated by contact with a solvent during the cutting process, allowing for simple and accurate adhesion of sheets without the need for complex equipment or heating, using a system comprising a die, punch, and a solvent deposition device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If welding or riveting is used to fix sheets together, then the sheets are securely fastened, but the equipment becomes difficult to integrate into the manufacturing installation

Engineering Contradiction:

Improvesheet fastening strengthVSAvoidequipment integration complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent replaces mechanical fastening methods (welding, riveting) with a chemical adhesion system using adhesive and solvent. The adhesive is applied to the strip surface, then reactivated by solvent contact during the punching operation, enabling sheet bonding without complex mechanical fastening equipment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary substance (solvent) that temporarily deactivates the adhesive during strip handling and then reactivates it during sheet accumulation. This intermediary enables the adhesive to function at the right moment without requiring complex equipment integration.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If complex stapling equipment is used to fix sheets, then the sheets are securely fastened, but the installation complexity increases

Engineering Contradiction:

Improvesheet fastening strengthVSAvoidinstallation complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent replaces the complex mechanical stapling system with a chemical adhesion system. Instead of using interlocking staples requiring specialized dies and punches, the invention uses adhesive applied to the strip that reactivates during the standard punching operation, eliminating the need for additional stapling equipment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If heating is used to activate adhesive bonding, then the sheets are securely fastened, but the strip expands causing dimensional inaccuracy

Engineering Contradiction:

Improveadhesive bonding strengthVSAvoidstrip dimensional accuracy

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The patent changes the activation parameter from thermal (heating) to chemical (solvent contact). Instead of using heat to activate the adhesive, the invention uses a solvent that contacts the adhesive during the punching operation, thereby avoiding thermal expansion and maintaining strip dimensional accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the thermal activation process with a chemical activation process. The adhesive is activated by solvent contact rather than heating, eliminating the thermal expansion issue while achieving secure bonding.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Strength

If adhesive is deposited at the heart of the tool before trimming, then sheet bonding is achieved, but the process becomes tricky and complex

Engineering Contradiction:

Improvesheet bonding strengthVSAvoidmanufacturing simplicity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent applies the adhesive to the strip surface in advance, before the punching operation. The adhesive remains dormant until the solvent contacts it during the sheet accumulation process, simplifying the manufacturing process by eliminating the need for precise in-tool adhesive deposition.

Inventive Principle:

Principle #10Preliminary action

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 simplifies the sheet-fixing process, reducing equipment complexity and dimensional inaccuracies by ensuring consistent adhesion without the need for heating, thus improving manufacturing efficiency and accuracy.

Implementation Method 1

cover, at least one surface of areas of the strip intended to become sheets, with an adhesive having an adhesive power to adhere to the strip

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

bringing a solvent into contact with the glue to reactivate the adhesive power of the glue

Methodology Applied

Scientific EffectSolvation: Solvation

Data Source

PatentEP3535836B1Lamination stack in which the laminations are attached to one another by adhesion, method and equipment for the production of such a lamination stack

Publication Date: 2021.03.17 R BOURGEOIS

Figure 1~3
Figure 4~5

AI summary

The invention relates to a lamination stack for an electromagnetic machine (1), comprising pairs of laminations (2) that are glued to one another using a solvent-reactivated glue. The invention also relates to a method and equipment for the production of such a lamination stack.