One-piece stripper retainer for punch anti-rotation
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Solution Overview
Problem
Modern punch retainers with two-piece metal stripper retainers fail to accurately and rigidly retain polyurethane cups, especially with newer smaller footprint ball-lock punch retainers, leading to issues with adhesion prevention and ease of assembly.
Innovation Solution
A one-piece machined stripper retainer with a snap-in design, incorporating an anti-rotation heel and snug fit, which eliminates the need for additional clamping force and allows for easier assembly and retention of urethane strippers, accommodating both older and newer style punch retainers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-piece stamped stripper retainer is used, then manufacturing cost is reduced, but manufacturing precision and retention accuracy deteriorate
Solution Approach 1:
The patent merges two separate stamped pieces into a single one-piece machined stripper retainer. This consolidation eliminates the joint between pieces, providing continuous support and improved precision while maintaining manufacturing feasibility through machining processes.
Solution Approach 2:
The patent transitions from stamped construction to machined construction, changing the manufacturing parameter from stamping to machining. This parameter change enables higher precision retention accuracy while still being economically viable through efficient machining methods.
2Ease of manufacture
If a two-piece stamped stripper retainer is used, then manufacturing cost is reduced, but axial support capability deteriorates
Solution Approach 1:
The patent combines two separate pieces into one monolithic structure that provides continuous axial support. The unified construction eliminates weak joints and provides consistent axial support throughout the stripper retainer's length.
3Manufacturing precision
If a one-piece machined stripper retainer is used, then retention accuracy is improved, but device complexity increases
Solution Approach 1:
The patent reduces structural complexity by merging multiple components into a single one-piece structure. Although machining is more complex than stamping, the elimination of assembly steps and joints simplifies the overall device structure and reduces the number of parts.
Data Source
AI summary
A one-piece stripper retainer for plastic cup shaped strippers with a universal snap-in design that can be used with both older style and newer style punch retainers. The stripper retainer incorporates an anti-rotation heel with a snug fit around a portion of the punch retainer body and clamps to the punch itself. In a second version, the stripper retainer also clamps to the punch itself but lacks the heel. In a third version, the stripper retainer bolts to the punch retainer with a separate threaded screw. In all three versions, the plastic stripper is locked in place by the snap-in feature without any additional clamping force.