Reconfigurable Forming Die Pin Locking for Precise Passive Positioning
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Solution Overview
Problem
Reconfigurable forming dies face challenges in precise pin positioning and retaining pin positions under forming pressures, leading to complexity and high costs due to the need for actuators and fixing mechanisms for each pin.
Innovation Solution
A reconfigurable forming die with vertically adjustable pins that use a simple mechanism involving bolts and hydraulic pressure to secure pins in place, allowing for matrix configuration and adjustment, using a preliminary model to set pin heights and a hydraulic pump to lock pins under forming forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If actuators and fixing mechanisms are used for each pin, then pin positioning precision and retention under forming pressures are improved, but device complexity and cost increase
Solution Approach 1:
The die is divided into multiple independent pin elements arranged in a matrix, each capable of individual adjustment. This segmentation allows precise positioning of each pin independently while using simple, standardized components rather than complex integrated systems.
Solution Approach 2:
Instead of using active actuators to move pins to desired positions, the invention uses passive gravity-assisted positioning where pins are allowed to settle under their own weight or are manually positioned, then locked in place. This inverts the conventional approach from active control to passive positioning with mechanical locking.
2Manufacturing precision
If actuators and fixing mechanisms are used for each pin, then pin positioning precision and retention under forming pressures are improved, but manufacturing cost increases
Solution Approach 1:
The invention uses simple, inexpensive components such as standard bolts, nuts, and washers instead of expensive actuators and complex fixing mechanisms. These basic fastening elements are readily available, easy to manufacture, and significantly reduce the overall cost of the die system while maintaining functional requirements.
Solution Approach 2:
The pin positioning and locking system is designed to be manually operable without requiring external power sources or complex control systems. Operators can directly adjust and secure pins using hand tools, eliminating the need for costly actuation systems while maintaining positioning precision.
3Reliability
If a mechanism to fix pins at desired position under extreme forming pressures is used, then pin position retention is improved, but device complexity increases
Solution Approach 1:
The pin heads are spherically ground to create a curved surface that contacts the spherical seat in the die plate. This spherical interface provides automatic centering and stable mechanical locking under forming pressures, ensuring pin position retention through simple geometric contact rather than complex locking mechanisms.
Solution Approach 2:
The invention replaces complex mechanical actuation and locking systems with simple gravitational and mechanical fastening principles. Pins are secured using basic bolt-and-nut fastening combined with spherical geometric contact, eliminating the need for sophisticated mechanical retention systems while maintaining reliability under forming loads.
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 solution enables cost-effective and precise positioning of pins, maintaining die rigidity during forming processes while reducing the need for complex actuation systems, thus enhancing the versatility and efficiency of reconfigurable forming dies.
Implementation Method 1
the hydraulic pressure associated with the hydraulic oil pushes the pins in a direction away from the pump
Implementation Method 2
rotating the reconfigurable forming die and preliminary model such that gravity moves each of the plurality of pins until a first end of each of the plurality of pins contacts and presses against the lower surface of the preliminary model
Data Source
AI summary
A method and apparatus for passive pin positioning of a reconfigurable forming die is disclosed. The apparatus may include a plurality of pins disposed within a frame, and a bolt that when tightened can secure or lock the pins into position. When the bolt is loosened, the position of the pins can be adjusted. A preliminary model of a contoured surface that is to be imparted to an article by the reconfigurable forming die can be used to help define a forming surface of the reconfigurable die.