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 repair due to their custom nature and lack of precise control in reciprocation, especially in high-speed applications.
Innovation Solution
A guided keeper assembly with a base block, bushing, and guide pin that precisely aligns and limits the reciprocation between the die shoe and die pad, using fasteners for secure yet detachable connections, facilitating modular and economical construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If custom-designed and handcrafted components are used in metal forming dies, then the die can be tailored to specific part requirements, but the design, manufacture, and repair costs increase substantially
Solution Approach 1:
The die set is divided into modular components (die shoe, die pad, keepers, guides) that can be independently manufactured and assembled. The guided keeper assembly further segments the alignment function into a separate modular unit that can be attached to the die shoe, allowing precision control without customizing the entire die set.
Solution Approach 2:
The guided keeper assembly serves multiple functions: it aligns the die shoe and die pad, limits reciprocation distance, and provides mounting points for guides and other components. This multi-functional component reduces the need for multiple custom-designed parts.
2Manufacturing precision
If carefully machined precision holes and recesses are created in the die set for mounting components, then component alignment and positioning are improved, but the lead time and labor requirements increase substantially
Solution Approach 1:
The guided keeper assembly is pre-manufactured with integrated alignment features and mounting holes. This preliminary preparation allows for quick installation on the die shoe without requiring precision machining to be performed at the die assembly stage, thereby reducing lead time.
Solution Approach 2:
The guided keeper assembly acts as an intermediary component between the die shoe and the forming tools. It provides a standardized interface with pre-machined mounting features that simplify the attachment process and reduce the need for custom precision machining at the final assembly stage.
3Productivity
If traditional spools with enlarged heads are used to connect die shoe and die pad, then the basic reciprocation function is achieved, but precise control of reciprocation is insufficient especially in high speed applications
Solution Approach 1:
The traditional mechanical spool connection is replaced with a guided keeper assembly that uses a guide pin and bushing mechanism. This substitution provides superior precision control through the guide pin sliding in the bushing, while maintaining the reciprocation function needed for high-speed operations.
Solution Approach 2:
The guide pin and bushing assembly serves as an intermediary mechanism between the die shoe and die pad, providing precise guidance and control of reciprocation. This intermediary component enables high-speed operation by ensuring accurate alignment and controlled motion throughout the reciprocation cycle.
4Reliability
If footed keepers are used to limit reciprocation between die pad and die shoe, then the reciprocation is positively limited, but the construction becomes complicated and expensive
Solution Approach 1:
The functions of keeping (limiting reciprocation), guiding (aligning components), and mounting (providing attachment points) are merged into a single guided keeper assembly. This integration reduces construction complexity by eliminating the need for separate footed keepers, guides, and mounting brackets.
Solution Approach 2:
The guided keeper assembly is a multi-functional component that simultaneously limits reciprocation through its keeper function, provides alignment through the guide pin and bushing, and offers mounting points for other die components. This multi-functionality reduces the overall number of parts and simplifies the construction.
Data Source
AI summary
A guided keeper assembly for metal forming dies includes a base having a mounting face and a fastener aperture to mount the base to an associated die shoe, as well as a central guide aperture. A guide pin having a central portion is closely received in the central guide aperture for precisely guiding reciprocal motion between the die pad and the die shoe. The guide pin has an enlarged head at one end which abuts the the-base to positively limit travel between the die shoe and the die pad, and a shoulder at an opposite end with an alignment mechanism that precisely locates the guide pin on the die pad. A fastener extends through the fastener aperture in the base to securely connect the same with the die shoe. Another fastener securely connects the second end of the guide pin with the die pad.