Lamination Stack Separation Using Pre-Positioned Strip Cut-Outs
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Solution Overview
Problem
Existing methods for stamping and stacking sheet metal parts to form lamination stacks require precise positioning of separating elements, which can cause damage to the progressive stamping tool and are complex, leading to instability and inefficiency.
Innovation Solution
Incorporating a second stamping-out stage to create a cut-out region in the electrical steel strip for the separating element, allowing it to be pushed back and integrated with the strip, enabling reproducible alignment and stable separation of sheet metal parts without additional separating elements, thus simplifying the last stamping stage and enhancing tool stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separating element is introduced beneath the electrical steel strip in the last stamping stage, then the separation of integrally joined sheet metal parts into lamination stacks is facilitated, but the progressive stamping tool can be damaged due to imprecise positioning of the separating element
Solution Approach 1:
The separating element is pre-positioned in a recess of the electrical steel strip before the stamping process begins. This preliminary positioning ensures that the separating element is automatically aligned with the stamping tool during operation, eliminating the need for separate positioning steps and preventing tool damage while maintaining stable separation functionality
2Ease of operation
If a separating element is stacked together with the first sheet metal parts, then the separation function is achieved, but complicated schemes are required in the last stamping stage for providing separating elements
Solution Approach 1:
The separating element is integrated into the electrical steel strip structure by placing it in a pre-formed recess. This merging of the separating element with the strip structure allows the separating function to be achieved as part of the normal stamping process, eliminating the need for separate complicated schemes or additional steps in the last stamping stage
3Manufacturing precision
If precise positioning of the separating element is required, then the separating element can be properly stacked, but this requires additional complexity and reduces manufacturing efficiency
Solution Approach 1:
The recess in the electrical steel strip is pre-formed to contain the separating element before stamping begins. This preliminary preparation ensures that during the stamping process, the separating element is automatically positioned correctly without requiring additional positioning operations, thereby maintaining high manufacturing precision while preserving productivity
Solution Approach 2:
The electrical steel strip structure itself (through its recess) provides the positioning function for the separating element. The strip's geometry automatically guides and secures the separating element in the correct position during stacking, eliminating the need for external positioning mechanisms and maintaining efficient production
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
This approach ensures high stability and reproducibility in the separation of lamination stacks, reduces waste, and increases the degree of utilization of the electrical steel strip, while maintaining throughput and avoiding design changes to the progressive stamping tool.
Implementation Method 1
an electrical steel strip, which has a hardenable adhesive layer, in particular a hot-hardening hot-melt adhesive varnish layer, on at least one of its flat sides
Data Source
AI summary
A method for stamping and stacking sheet metal parts to form lamination stacks is disclosed. In order to facilitate the separation of joined sheet metal parts into lamination stacks, a second stamping-out of at least one second sheet metal part is performed in a step preceding the first stamping-out, as well as a pushing-back of the separating element into a region of the electrical steel strip from which the second sheet metal part has been stamped and a pushing-out of the separating element from the electrical steel strip with the first stamping-out.