Method for manufacturing laminated iron core and device for manufacturing laminated iron core

SI3576264T1Active Publication Date: 2026-08-31MITSUI HIGH TEC INC
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Patent Information

Application Number
SI201731670
Authority / Receiving Office
SI · SI
Patent Type
Patents
Current Assignee / Owner
Priority Date
2017-01-25
Filing Date
2017-11-08
Publication Date
2026-08-31
Estimated Expiration
2037-11-08

AI Technical Summary

Technical Problem

The existing method of manufacturing stacked stator cores faces challenges with metal plate deformation during half-blanking and pushing-back, leading to shape inaccuracies and pilot hole displacement, which affects the positioning and assembly of the core components.

Method used

A method involving the formation of pilot holes and subsequent processing steps with pilot pins to accurately position and press-fit metal plate portions, followed by forming secondary pilot holes to account for deformation, ensuring precise positioning and shape accuracy of the stacked core.

Benefits of technology

This approach enables the accurate formation of stacked cores with reduced strain and displacement, improving yield and reducing production costs by allowing the use of narrower metal plates and enhancing motor performance through precise air gap formation.

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Abstract

A method of manufacturing a stacked core includes: a first step of forming a first pilot hole in a strip-like metal plate by a first punch; a second step, in a state in which a first pilot pin is inserted into the first pilot hole to position the metal plate, of working a predetermined portion of the metal plate by a second punch, and of press-fitting a worked portion of the metal plate that is worked by the second punch into the metal plate; a third step of forming a second pilot hole in the metal plate by a third punch, after the second step and before another work is performed on the metal plate; and a fourth step of blanking a region including the worked portion by a fourth punch to form a first blanked member, in a state in which a second pilot pin is inserted into the second pilot hole to position the metal plate, after the third step.
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