Bonded Stacked Core Assembly With Pre-Dried Curing Accelerators

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for manufacturing bonded and stacked cores face challenges in achieving high productivity while ensuring sufficient bonding strength, as the use of curing accelerators is not optimized, leading to potential interference with press working oil and reduced punching workability.

Innovation Solution

The method involves applying anaerobic and instantaneous adhesive curing accelerators to the steel sheet surfaces before press working, actively drying them to maintain high concentrations, and using a combination of adhesives with different curing speeds to ensure early bonding strength and uniformity, thereby suppressing dilution by press working oil.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the content of curing accelerator is increased to achieve higher curing accelerating effect, then bonding speed and bonding strength are improved, but the ratio of press working oil is reduced which may affect punching workability

Engineering Contradiction:

Improvebonding speedVSAvoidpunching workability

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The curing accelerator is applied to the steel sheet surface before press working and bonding operations. This preliminary application ensures the curing accelerator is already in position on the steel sheet surface before subsequent operations, allowing high concentration curing accelerator to be present without requiring large amounts of press working oil that would dilute it.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The curing accelerator is applied locally to the steel sheet surface at specific locations where bonding is required, rather than uniformly throughout the entire processing system. This localized application maintains high concentration of curing accelerator at the bonding interface without affecting the overall press working oil ratio needed for punching operations.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If curing accelerator is added to press working oil in diluted state, then application is simplified, but the concentration of curing accelerator is reduced which requires larger amounts to achieve sufficient bonding

Engineering Contradiction:

Improveapplication simplicityVSAvoidcuring accelerator content

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The curing accelerator is applied to the steel sheet surface in advance before press working operations. This preliminary application eliminates the need to mix curing accelerator with press working oil, maintaining high concentration while simplifying the application process through direct surface coating.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If natural drying of curing accelerator is used, then process is simpler, but drying time is insufficient and productivity is reduced

Engineering Contradiction:

Improvedrying process complexityVSAvoidmanufacturing cycle time

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The curing accelerator is applied to the steel sheet surface before subsequent bonding operations. This preliminary application with active drying ensures the curing accelerator is ready to function immediately when bonding occurs, eliminating waiting time and improving productivity without adding complex drying equipment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The drying method is changed from passive natural drying to active drying, which accelerates the evaporation of solvent from the curing accelerator. This parameter change in the drying process significantly reduces drying time and improves manufacturing cycle time while maintaining process simplicity.

Inventive Principle:

Principle #35Parameter changes

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 approach enhances productivity and ensures sufficient bonding strength, allowing for efficient manufacturing of high-performance bonded and stacked cores, such as stators for rotary electric machines, with reduced manufacturing time and cost.

Implementation Method 1

applying an anaerobic adhesive and an instantaneous adhesive to one surface of the strip-shaped steel sheet... a curing accelerating layer is formed by applying an anaerobic adhesive curing accelerator and an instantaneous adhesive curing accelerator to one surface or both surfaces of the strip-shaped steel sheet before the press working oil is applied

Methodology Applied

Scientific EffectCuring acceleration: Catalysis

Implementation Method 2

performing press working on a strip-shaped steel sheet with a press working oil applied to one surface or both surfaces thereof

Methodology Applied

Scientific EffectLubrication: Lubrication

Data Source

PatentUS12580463B2Bonded and stacked core manufacturing method

Publication Date: 2026.03.17 NIPPON STEEL CORPORATION

AI summary

This bonded and stacked core manufacturing method is a method for manufacturing a bonded and stacked core by performing press working on a strip-shaped steel sheet with a press working oil applied to one surface or both surfaces thereof, applying an anaerobic adhesive and an instantaneous adhesive to one surface of the strip-shaped steel sheet to obtain a plurality of steel sheet components, and stacking and bonding the steel sheet components, in which a curing accelerating layer is formed by applying an anaerobic adhesive curing accelerator and an instantaneous adhesive curing accelerator to one surface or both surfaces of the strip-shaped steel sheet before the press working oil is applied, and drying the adhesive curing accelerator and the instantaneous adhesive curing accelerator.