Modular Pilot Assembly with Integrated Stripper 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-designed components and precise machining, with existing pilot assemblies being expensive and time-consuming to construct and install.
Innovation Solution
A modular pilot assembly with a self-contained stripper, featuring a pilot sleeve with a cylindrical shape and integrated ejector pin mechanism, allows for precise location and automatic stripping of the stock strip from the pilot pin, reducing the need for custom components and simplifying installation with a single screw mounting system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If custom-designed components and precise machining are used for pilot assemblies, then manufacturing precision and reliability are improved, but manufacturing cost and time consumption increase
Solution Approach 1:
The pilot assembly is divided into separate modular components: a pilot pin, a stripper plate, and a mounting base. Each component can be manufactured independently using standard machining processes, then assembled together. This segmentation allows for simpler individual part manufacturing while maintaining overall assembly precision through standardized interfaces and tolerance specifications.
Solution Approach 2:
The pilot assembly design incorporates a universal mounting interface and standardized dimensions that allow the same basic assembly to be used across multiple die configurations. The stripper plate can accommodate different pilot pin sizes and shapes, reducing the need for custom-designed components for each specific application while maintaining manufacturing precision.
2Reliability
If custom-designed components are used for pilot assemblies, then reliability is improved, but device complexity increases
Solution Approach 1:
The stripper function and pilot locating function are merged into a single integrated assembly. The stripper plate is designed to simultaneously perform stock stripping and pilot locating operations, reducing the number of separate components needed while maintaining reliable performance of both functions through proper geometric design and material selection.
Solution Approach 2:
The stripper plate is designed with self-aligning features that allow it to automatically position itself relative to the pilot pin during assembly and operation. The geometry of the pilot hole and stripper plate interface ensures proper alignment without requiring complex adjustment mechanisms, thereby reducing assembly complexity while maintaining reliability.
3Manufacturing precision
If manual installation and custom mounting are used for pilot assemblies, then manufacturing precision is improved, but installation time and labor cost increase
Solution Approach 1:
The pilot assembly is pre-assembled with all components (pilot pin, stripper plate, mounting base) configured and positioned correctly during manufacturing. The assembly includes pre-drilled mounting holes and pre-configured stripper geometry, allowing for quick installation into the die set without requiring time-consuming on-site adjustment or custom fitting operations.
Solution Approach 2:
The pilot assembly is designed as a separable module that can be installed as a complete unit rather than requiring installation of multiple individual components. This modular approach reduces the number of installation steps and fastening operations required while maintaining precision through standardized mounting interfaces and tolerance specifications.
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
The modular pilot assembly reduces manufacturing costs, simplifies installation, and ensures consistent stripping of the stock strip, improving efficiency and reducing the risk of the strip sticking to the pilot pin, while accommodating various pilot pin sizes and shapes.
Implementation Method 1
a spring member having a generally hollow interior that is received onto and over the spring retainer collar on the inner end portion of the pilot sleeve, an outer end oriented toward the stock strip, received in the spring groove and operably engaging the inner end of the ejector pin to bias the ejector pin outwardly to the extended position
Data Source
AI summary
A pilot assembly and method has a cylindrical pilot sleeve with an apertured outer end in which a separate pilot pin is received, a grooved inner end, and a central portion with at least one inwardly curved sidewall relief, as well as internally mounted reciprocating ejector pins with outer ends that protrude through holes in the outer body end to strip stock from the pilot pin. A spring has its outer end mounted in the sleeve groove, and an inner end captured in a die pocket in a pretensed condition. A mounting screw has an enlarged head that has at least a portion thereof fit into the pilot sidewall relief, and a threaded shank that anchors the pilot sleeve in the die.