Laminated Iron Core Punching Sequence to Prevent Die Adhesive Contamination
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Solution Overview
Problem
In the manufacturing of laminated iron cores, the adhesive agent often protrudes beyond the outer shape contour, leading to adhesion and contamination of the die set, which impairs its operation and makes it difficult to apply the adhesive agent on fine portions like tooth protrusions without protrusion.
Innovation Solution
A manufacturing apparatus and method that includes a first punch and die for initial shaping, an adhesive agent application region defined by the first punch and die, and a second punch and die for final shaping, with a squeeze ring and stripper plate configured to prevent adhesive agent adhesion and contamination by creating recesses corresponding to the adhesive application regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the adhesive layer is extended to a region near the contour of the outer shape to secure stable stacking, then the stacking stability is improved, but the adhesive agent may protrude outside the contour and adhere to the die set, causing contamination and impairment of die set operation
Solution Approach 1:
The punching process is divided into two separate stages: first outer shape punching followed by second outer shape punching. This segmentation allows the adhesive application region to be defined by the first punch and die, while the second punch and die operate on a different contour, preventing adhesive contact with the second die set.
Solution Approach 2:
The first outer shape punching is performed preliminarily to define the adhesive application region before the adhesive agent is applied. This preliminary action creates a boundary that prevents the adhesive from reaching the second die set during subsequent operations.
2Strength
If the adhesive agent is applied on fine portions such as tooth portions to ensure proper bonding, then the bonding quality is improved, but it becomes difficult to apply the adhesive agent without protrusion, limiting the ability to provide adhesive layer on fine portions
Solution Approach 1:
The outer shape punching is divided into two stages with different punch and die configurations. The first punch and die create a larger adhesive application region that is easier to access, while the second punch and die create the final precise outer shape, allowing adhesive to be applied on fine portions without direct contact between adhesive and the second die set.
3Device complexity
If a single punch and die set is used for outer shape punching, then the device complexity is reduced, but the adhesive agent will adhere to the die set and cause contamination
Solution Approach 1:
The single outer shape punching operation is segmented into two sequential operations: first outer shape punching and second outer shape punching. Each operation has its own punch and die set, allowing the adhesive application region to be defined separately from the final outer shape, thereby preventing adhesive contamination of the second die set.
Data Source
AI summary
To prevent an adhesive agent from adhering to a die set for outer shape punching and avoid contamination of the die set by the adhesive agent even if the adhesive agent protrudes from the outer shape contour of a laminated iron core, a laminated iron core manufacturing device includes: a first punch (32) and a first die (48) for punching a part of an outer shape of each iron core lamina in a sheet steel strip; an adhesive agent applying apparatus (60) configured to apply an adhesive agent on an adhesive agent application region including a portion defined in the sheet steel strip by punching by the first punch (32) and the first die 48; and a second punch (34) and a second die (50) configured to punch the outer shape of each iron core lamina other than the part punched by the first punch (32) and the first die (48) from the sheet steel strip.