Blanking Die Lifter Mechanism for Sheet Feeding Stability
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Solution Overview
Problem
The increased width and decreased thickness of sheets used in laminated iron core manufacturing lead to reduced rigidity, causing sheets to bend and get caught in blanking die apparatuses during feeding, resulting in mechanical damage and defects in the final product.
Innovation Solution
A blanking die apparatus with a lifter mechanism featuring first and second lifters, where second lifters are arranged around the blanking hole and have a smaller contact area, a trapezoidal or circular arc shape, and a shorter lifting height than first lifters, to reduce bending and prevent sheet contact with the die during feeding and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sheet width is increased to meet enlargement of the laminated iron core, then the size of the laminated iron core is improved, but the rigidity of the sheet is lowered causing the sheet to bend and get caught during feeding
Solution Approach 1:
The lifter mechanism performs preliminary action by lifting the sheet before it enters the blanking hole, preventing the sheet from bending and getting caught during the feeding operation. This advance support stabilizes the sheet in its preliminary state, resolving the contradiction between increased sheet size and reduced rigidity.
2Reliability
If the lifting height of lifters is increased to prevent sheet contact with blanking hole periphery, then the sheet support is improved, but mechanical damage such as scratches or abrasion is generated in contact parts
Solution Approach 1:
The lifter contact surface is designed with a specific local quality - a curved surface with a radius of curvature R1 that is 0.5 to 2 times the sheet thickness. This localized geometric feature optimizes the contact interface to reduce mechanical damage while maintaining adequate sheet support, resolving the contradiction between support reliability and prevention of mechanical damage.
3Volume of moving object
If the sheet thickness is decreased to reduce laminated iron core size, then the compactness of the product is improved, but the rigidity of the sheet is extremely lowered causing feeding failures
Solution Approach 1:
The lifter mechanism provides preliminary support to thin sheets before they enter the blanking operation, compensating for their inherently low rigidity. This advance intervention prevents feeding failures in thin sheets while allowing the product to maintain compact dimensions, resolving the contradiction between product compactness and sheet stability.
Data Source
AI summary
A blanking die apparatus includes a lower die in which a plurality of working stations are arranged, and an upper the which moves upward and downward with respect to the lower die. A progressively fed sheet is sequentially blanked or stamped out respectively in the working stations to form iron core pieces, and then to laminate the iron core pieces to form a laminated iron core. The lower die includes a lifter part which lifts the sheet from the lower die when the sheet is progressively fed. The lifter part first lifters installed in an outer peripheral area in each of the working stations, and second lifters installed on an upper surface of a blank die which has a blanking hole formed for blanking the iron core pieces in an external form, or on an upper surface of a blank die holder.