Laminated Iron Core Punching with Internal-External Fixing
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Solution Overview
Problem
The deterioration of magnetic characteristics in laminated iron cores during punch processing, particularly when stacked steel sheets are punched, due to plastic and elastic strain, is not adequately addressed by existing technologies, which also complicate mold mechanisms and increase costs.
Innovation Solution
A punch processing method that fixes steel sheets using pairs of fixing parts positioned outside and inside a closed curved line corresponding to the outermost periphery of the iron core, with specific distance and length criteria to minimize deformation and maintain magnetic integrity, allowing for efficient integration and joining of iron core segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If punch processing is performed on stacked steel sheets simultaneously, then productivity is improved, but magnetic characteristics deteriorate due to increased plastic deformation and elastic strain
Solution Approach 1:
The steel sheets are fixed to each other before punch processing using adhesive or welding at predetermined positions. This preliminary fixing action prevents relative displacement between sheets during punching, eliminating the need for complex push-back mechanisms while maintaining magnetic characteristics and achieving high productivity through simultaneous multi-sheet processing
2Manufacturing precision
If conventional fixing methods using interlocking or push-back techniques are used, then dimensional accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The complex push-back mechanism and interlocking structures are extracted and removed from the system. Instead, a simple adhesive or welding process is applied at predetermined positions before punching, achieving dimensional accuracy without requiring complex mold mechanisms or multiple processing steps
3Reliability
If sheet thickness is reduced to minimize iron loss, then magnetic performance is improved, but the number of sheets required increases significantly reducing productivity
Solution Approach 1:
Multiple thin steel sheets are fixed together and processed simultaneously in a single punching operation. The adhesive or welding process combines the sheets into a unified structure that can be punched together, maintaining the magnetic performance benefits of thin sheets while achieving productivity equivalent to processing fewer thicker sheets
Data Source
Figure 1
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Figure 3(a)~3(c)
AI summary
A punch processing method for a laminated iron core according to the present invention sequentially feeds a plurality of steel sheets to a mold and performs a plurality of processes in the mold including punch processing on the steel sheets in a stacked state, the punch processing method for the laminated iron core includes fixing the steel sheets that are stacked to each other at a fixing part FA that is positioned outside a closed curved line L corresponding to an outermost periphery of the laminated iron core and a fixing part FB that is positioned in a portion that finally serves as the laminated iron core, and then performing punch processing on the outermost periphery of the laminated iron core.