Punch Length Adjustment Subassembly for Tool-Free Retrofit
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Solution Overview
Problem
Existing punch assemblies require time-consuming disassembly and tool-based operations for punch length adjustment and sharpening, leading to reduced productivity, especially in high-speed automated systems, and are not adaptable for upgrading existing equipment.
Innovation Solution
A tool-free punch length adjustment system that allows manual adjustment without disassembly, featuring a punch length adjustment subassembly with a rotatable punch head and threaded connection, enabling adjustment at the upper end and manual stripper release at the lower end, while preventing misalignment and ensuring secure drawbolt retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional punch assemblies are used, then structural simplicity is maintained, but tool-based disassembly and time-consuming adjustment are required
Solution Approach 1:
The punch assembly is divided into separate functional components: a punch holder assembly that can be independently removed from the punch press, and a punch member that can be independently removed from the holder. This segmentation enables the holder to remain in the press while only the punch is removed for sharpening, eliminating time-consuming disassembly of the entire assembly and reducing downtime.
Solution Approach 2:
The punch member is extracted as a separate removable component from the punch holder assembly. This allows the punch to be independently removed for sharpening while the holder remains in place, eliminating the need to disassemble the entire punch assembly and significantly reducing adjustment time and downtime.
2Productivity
If manual length adjustment mechanisms are added, then productivity is improved, but existing punch assemblies cannot be upgraded
Solution Approach 1:
The punch holder assembly is designed with universal features that allow it to function both as a traditional fixed-length holder and as a platform for automated length adjustment systems. The holder can be used in existing punch presses without modification, or upgraded with automated adjustment mechanisms, providing versatility and adaptability across different application requirements.
Solution Approach 2:
The punch holder assembly incorporates a drawbolt mechanism that enables dynamic adjustment of punch length. The drawbolt can be manually operated or integrated with automated systems, allowing the punch length to be dynamically changed without replacing the entire holder assembly, thus improving productivity while maintaining compatibility with existing equipment.
3Reliability
If the punch is securely retained, then reliability is improved, but tool-free removal becomes difficult
Solution Approach 1:
The drawbolt mechanism is designed to preliminarily secure the punch in place during operation, ensuring reliable retention. For removal, a preliminary action is taken by accessing the drawbolt through a provided opening and loosening it, which releases the punch without requiring tools. This preliminary securing and preliminary releasing sequence ensures both reliability during operation and ease of maintenance.
Solution Approach 2:
The punch holder assembly incorporates a self-service feature where the drawbolt can be accessed and operated from the front of the assembly through a provided opening. This allows the punch to be securely retained during operation but easily removed by simply operating the drawbolt without requiring external tools, balancing reliability with ease of maintenance.
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
Enables efficient, tool-free adjustment and removal of the punch, reducing downtime and preventing misalignment, while allowing for easy upgrading of existing punch assemblies to improve productivity and prevent accidental drawbolt loss.
Implementation Method 1
a punch return spring operatively associated with the punch for moving the punch upwardly to its retracted position
Implementation Method 2
The punch head has a lower component which is operatively associated by means of a threaded length adjustment connection for changing the distance between the operating tip of the punch and the upper end of the punch head
Data Source
AI summary
A punch assembly for a punch press has a punch housing with a punch that is slideably mounted for reciprocation along punch axis within the punch housing and at least one resilient member in the housing for yieldably biasing the punch upwardly in the housing along the punch axis. A punch length adjustment subassembly is provided in the punch housing. The subassembly has a base member that is slideable axially but non-rotatably mounted within the housing and a punch head member having an upper end that is positioned to be struck by a punch ram of a punch press for driving the punch downwardly to an operating position. The punch head is mounted for rotation on the punch axis relative to the base member but is held against axial movement relative to the base member. The punch head is operatively associated by a threaded length adjustment connection to the punch and a releasable stop member is connected between the punch head and the base member for preventing rotation of the punch head relative to the base member while the punch assembly is in operation on the punch press. The invention is also directed to the punch head subassembly per se as a retrofit insert to update existing punch assemblies for manual tooless punch length adjustment and tooless punch removal.