Guided Keeper Assembly for Metal Forming Dies
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Solution Overview
Problem
Current metal forming dies are labor-intensive and costly to design, manufacture, and modify due to the need for custom, precision components and complex assembly processes, which also lack precise control of reciprocation, especially in high-speed applications.
Innovation Solution
A guided keeper assembly with a flat shouldered guide pin and offset fastener is introduced, featuring a base with a mounting face and central aperture, a guide pin with an enlarged head and flat shoulder, and a biasing member to control reciprocation between the die shoe and pad, allowing for precise alignment and secure, detachable mounting, reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If custom, precision components are used in metal forming dies, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The die assembly is divided into modular components: die shoe, die pad, and guided keeper assembly. The guided keeper assembly itself is segmented into base, guide pin, and fastener elements. This modular segmentation allows each component to be manufactured separately with standard precision processes, then assembled to achieve the required overall precision without requiring the entire assembly to be custom-machined as a single complex unit.
Solution Approach 2:
The guide pin serves multiple functions: it provides precise alignment between die shoe and die pad, acts as a mechanical stop to limit reciprocation distance, and serves as a mounting point for fasteners. The base provides both structural support and a mounting surface for the guide pin. This multi-functionality reduces the number of separate components needed, simplifying the overall device while maintaining precision.
2Manufacturing precision
If custom, precision components are used in metal forming dies, then manufacturing precision is improved, but manufacturing time and cost increase
Solution Approach 1:
The guided keeper assembly is designed as a pre-assembled unit with the guide pin already positioned in the base. The base is prepared with a pre-selected location for the guide pin, and the guide pin is inserted and secured with fasteners before the entire assembly is installed in the die. This preliminary assembly approach allows standard machining operations to be performed on individual components rather than requiring complex precision machining of the complete assembly, significantly reducing manufacturing lead time.
Solution Approach 2:
By segmenting the die into modular components that can be manufactured separately using standard processes, each component can be produced more quickly and with less complex tooling. The modular nature allows parallel manufacturing of multiple components, reducing overall lead time compared to manufacturing a single custom precision assembly.
3Manufacturing precision
If custom, precision components are used in metal forming dies, then manufacturing precision is improved, but ease of repair and modification decreases
Solution Approach 1:
The guided keeper assembly is designed as a discrete, removable module that can be easily detached from the die shoe and die pad. The base is mounted to the die shoe with removable fasteners, and the guide pin can be removed from the base by removing its fasteners. This segmentation allows the guided keeper assembly to be quickly replaced or modified without affecting other die components, significantly improving ease of repair and modification while maintaining precision through the standardized design of replaceable parts.
Solution Approach 2:
The modular guided keeper assembly design allows damaged or worn components to be easily removed and replaced with new or refurbished units. The standardized interface and removable fasteners enable quick replacement of the entire assembly or individual components like the guide pin, reducing repair time and allowing recovery of still-serviceable components for reuse.
4Reliability
If footed keepers are used to limit reciprocation, then reliability is improved, but manufacturing precision and control of reciprocation decreases
Solution Approach 1:
The guide pin acts as an intermediary element between the die shoe and die pad, providing precise alignment and controlled reciprocation. The cylindrical body of the guide pin fits into a corresponding hole in the die pad, creating a precise mechanical interface that controls the reciprocation path. The flat shoulder on the guide pin provides a positive stop that reliably limits the reciprocation distance while maintaining manufacturing precision through standard cylindrical fitting tolerances.
Data Source
AI summary
A guided keeper assembly includes a base, at least one marginal fastener aperture to detachably mount the base to an associated die shoe, and a central guide aperture. A guide pin is closely received in the central aperture of the base. A first end of the guide pin has an enlarged head to positively limit travel between the die shoe and die pad, and an opposite second end with a generally flat terminal shoulder configured for close reception in a blind hole in the die pad. The shoulder has a fastener aperture at a location spaced radially offset from the central axis of the guide pin. A fastener extends through the fastener aperture in the die pad and engages in the fastener aperture in the second end of the guide pin to securely, yet detachably, connect the second end portion of the guide pin with the die pad.