Ball Lock Punch Retainer Design for Stamping Dies
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Solution Overview
Problem
Traditional punch retainers in the stamping industry are costly due to the use of multiple parts, complex manufacturing processes, and increased production time, particularly with the need for backing plates, dowels, and fasteners, which also lead to inaccuracy and potential spring release issues during installation and removal.
Innovation Solution
A punch retainer design featuring a cylindrical body with a punch-retaining passage and a spring passage having an intersecting area with a threaded section, utilizing a regular spring and a set screw to retain the ball lock mechanism, eliminating the need for a backing plate, dowels, and snap rings, and allowing for adjustable compression to extend the spring's life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backing plate or plug is used behind the punch, then the press platen or die set is protected from wear and impact damage, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the backing plate function directly into the retainer body by creating a recessed area at the bottom of the punch-receiving passage. This integration eliminates the need for separate backing plates or plugs, reducing part count while maintaining protection against wear and impact damage to the press platen or die set.
2Reliability
If three or more dowels and two or more fasteners are used to position and fasten the retainer, then the retainer is securely positioned in the desired orientation, but the manufacturing cost and preparation time increase
Solution Approach 1:
The patent eliminates the need for multiple dowels and fasteners by integrating positioning features directly into the retainer body design. The retainer includes built-in alignment surfaces and mounting features that provide secure positioning without requiring separate locating dowels or multiple fastening points, thereby reducing both preparation time and manufacturing cost.
3Reliability
If an undercut and spring with enlarged portion are used to hold the spring in place, then the spring is retained when the retainer is uninstalled, but the manufacturing cost increases
Solution Approach 1:
The patent integrates the spring retention mechanism into the existing spring passage design without requiring separate retention features. The spring is retained through the natural configuration of the passage and spring interaction, eliminating the need for undercuts, enlarged spring portions, or snap rings, thereby maintaining spring retention while reducing manufacturing complexity and cost.
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
This design reduces manufacturing costs, simplifies production, and extends the retainer's useful life by using a single dowel and fastener, while ensuring accurate alignment and preventing spring release, thus improving the overall efficiency and cost-effectiveness of punch retainer production.
Implementation Method 1
A spring can be disposed in the spring passage and can bias the ball toward the intersecting area
Implementation Method 2
The threaded member can compress the spring into the ball. The threaded member can retain the spring in the spring passage
Data Source
AI summary
A punch retainer can utilize a spring passage to retain a locking ball and a spring. A retaining member can be disposed in the spring passage to hold the spring and ball therein and to impart a desired compressive force on the spring. The retaining member can be axially aligned with the centerline of the spring passage and can axially compress the spring. The retaining member can be adjusted to adjust the compression of the spring. A single dowel passage can be utilized to accurately align the retainer in a desired orientation.