Motor Core Push-Out Jig for Pin Detachment Without Deformation

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Solution Overview

Problem

The existing manufacturing methods for motor cores result in deformation and biting issues between laminated and welded annular iron core pieces and positioning pins or shafts, leading to difficulties in detachment and potential damage during the manufacturing process.

Innovation Solution

A manufacturing method that uses a push-out device with a push-out jig and loading jig to apply a load and push out the laminated annular iron core pieces from positioning pins or a positioning shaft, preventing deformation by fixing the positioning pins or shaft in the laminating direction and using a push-out pin to gently disengage the core from the pins or shaft.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the annular iron core pieces are laminated and welded together using guide pins and guide holes for positioning, then the alignment precision is improved, but biting is caused between the guide pins and guide holes due to radial shrinkage during welding

Engineering Contradiction:

Improvealignment precisionVSAvoidbiting between guide pins and guide holes

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The invention divides the positioning function into two separate components: positioning pins that remain fixed during welding, and detachable positioning components (guide pins or positioning holes) that are removed after welding. This segmentation allows the fixed positioning pins to maintain alignment precision while the detachable components prevent biting issues by being removed before the shrinkage occurs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention performs preliminary positioning using positioning pins before welding, ensuring accurate alignment. After welding completes and radial shrinkage occurs, the positioning pins are detached from the iron core pieces. This preliminary action establishes precise positioning that accommodates the subsequent shrinkage without causing biting.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the laminated annular iron core pieces are forcibly pulled out from the positioning pins after welding, then the detachment is achieved, but the annular iron core pieces are deformed

Engineering Contradiction:

ImprovedetachmentVSAvoiddeformation of iron core pieces

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The invention performs preliminary detachment preparation by designing the positioning system to allow easy removal after welding. The positioning pins are configured to be detachable from the iron core pieces after welding completes, enabling straightforward removal without forcing or deformation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of forcing the iron core pieces off the positioning pins through deformation, the invention inverts the approach by designing the positioning pins to be easily removable from the iron core pieces. This reversal of the force application direction prevents deformation while achieving detachment.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If positioning holes are used at the center of single-type annular iron core pieces for positioning during welding, then the alignment is improved, but biting is caused between positioning holes and positioning shaft due to radial shrinkage

Engineering Contradiction:

Improvepositioning alignmentVSAvoidbiting between positioning holes and positioning shaft

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The invention segments the positioning system into a fixed positioning shaft and detachable positioning holes in the iron core pieces. The positioning shaft remains fixed during welding to ensure alignment precision, while the positioning holes are designed to be detachable after welding to prevent biting caused by radial shrinkage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention performs preliminary positioning using the positioning shaft and positioning holes before welding, ensuring accurate alignment. After welding completes and radial shrinkage occurs, the positioning holes are detached from the positioning shaft. This preliminary action establishes precise positioning that accommodates the subsequent shrinkage without causing biting.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240413717A1Motor core manufacturing method and push-out device

Publication Date: 2024.12.12 NHK SPRING CO LTD

AI summary

A manufacturing method for a motor core that makes a laminated annular iron core involving an upper and a lower jigs, arranges the laminated annular iron core with respect to the push-out jig and a loading jig so as to escape tip ends of positioning pins in place of the upper jig, while applying load onto the push-out jig using the loading jig, pushes out the laminated annular iron core with respect to the positioning pins.