Iron Core Annealing Jig With Protrusions to Prevent Deformation
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Solution Overview
Problem
During annealing of laminated iron cores, the difference in thermal expansion coefficients between the core and the pallet leads to relative movement, causing deformation and reduced dimensional accuracy due to shearing forces.
Innovation Solution
An annealing jig with a placement surface having a different linear expansion coefficient than the iron core, featuring protrusions or a coating film to reduce contact area and friction, supporting the core from below and allowing gas access for uniform oxide film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the iron core is placed on a plate-shaped pallet for annealing, then the annealing process can be performed, but the difference in thermal expansion coefficients causes relative movement and shearing forces leading to deformation
Solution Approach 1:
The contact surface between the pallet and iron core is segmented into multiple discrete contact points through protrusions. This segmentation reduces the continuous contact area that causes shearing forces during thermal expansion, allowing the iron core to expand and contract with minimal friction and deformation risk.
Solution Approach 2:
The protrusions create localized contact points with specific geometric properties (rounded tips, controlled height) that differ from the bulk pallet material properties. These localized features reduce friction and prevent shearing forces while maintaining structural support, addressing the thermal expansion issue at the critical contact interfaces.
2Ease of manufacture
If the iron core is placed on a plate-shaped pallet for annealing, then the annealing process can be performed, but the friction between the core and pallet causes deformation
Solution Approach 1:
The continuous frictional contact is segmented into discrete point contacts through protrusions. This reduces the total friction force acting on the iron core during thermal expansion, preventing deformation while still providing adequate support for the annealing process.
Solution Approach 2:
Instead of making the pallet surface smooth and continuous to reduce friction, the invention inverts the approach by creating protrusions that concentrate contact to specific points. This counterintuitive approach actually reduces total friction by minimizing the contact area while maintaining support functionality.
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
Mitigates shearing forces and ensures uniform oxide film formation, maintaining dimensional accuracy and corrosion resistance of the iron core.
Implementation Method 1
A coefficient of friction between the coating film and the iron core is smaller than a coefficient of friction between the base and the iron core
Implementation Method 2
the coefficients of linear expansion of the laminated iron core and the pallet are different from each other, the amounts of thermal expansion of the laminated iron core and the pallet are different from each other
Implementation Method 3
ensures uniform oxide film formation
Data Source
AI summary
A method of annealing an iron core includes placing the iron core on a placement surface of an annealing jig formed of a material having a coefficient of linear expansion different from that of a material of the iron core, and annealing the iron core placed on the placement surface. Multiple protrusions that support the iron core from below and are spaced apart from each other are formed on the placement surface.