Variable Mold Pin Control Using Magnetorheological Fluid Valves
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Solution Overview
Problem
Conventional variable molds have low resolution, requiring complex electromechanical actuators and interpolation layers, limiting their application to large-scale articles with large curvature radius and incurring high costs for frequent product changes.
Innovation Solution
A variable mold using magnetorheological fluid valves and hydraulic pin systems, which include a valve, tubing, and a pin coupled to a supply of actuation fluid, allowing precise pin positioning through fluid-induced phase change from liquid to solid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional variable molds are used, then the mold can be adjusted for different products, but the resolution is low and complex electromechanical actuators are required
Solution Approach 1:
The patent replaces complex electromechanical actuators with a magnetic field-based system. Magnets are positioned behind the mold plate to directly actuate pins through magnetic force, eliminating the need for motors, servos, and mechanical linkages. This substitution of mechanical actuation with magnetic field control achieves high-resolution pin positioning while dramatically simplifying the device architecture.
Solution Approach 2:
The patent changes the control parameter from mechanical position control to magnetic field strength control. By varying the strength and distribution of magnetic fields generated by electromagnets or permanent magnets, the system can precisely control pin extension distances. This parameter change enables high-resolution adjustment without complex mechanical positioning mechanisms.
2Manufacturing precision
If conventional variable molds are used, then the mold can be adjusted, but an interpolation layer is required to smooth the surface
Solution Approach 1:
The patent segments the mold surface into numerous individually controllable pins arranged in a grid pattern. Each pin can be independently actuated to any position, allowing the formation of complex three-dimensional surfaces. This segmentation eliminates the need for interpolation layers because each pin creates a precise control point that can be directly positioned, and the collective arrangement of pins naturally smooths the surface through fine spatial distribution.
Solution Approach 2:
The patent transitions from two-dimensional mold plate adjustment to three-dimensional pin positioning. By controlling pins to extend at varying distances perpendicular to the mold plate, the system creates true 3D surface geometry. This dimensional change allows direct formation of complex curved surfaces without requiring additional interpolation layers, as the pins themselves define the three-dimensional topology.
3Adaptability or versatility
If molds are changed frequently for custom manufacturing, then product variety increases, but time and cost increase significantly
Solution Approach 1:
The patent implements a dynamically reconfigurable mold where pin positions and heights can be changed in real-time through magnetic field control. This dynamic capability allows the same mold plate to adapt to different product geometries without physical replacement. The system can transition between different mold configurations rapidly by simply changing magnetic field patterns, enabling frequent product changes without the time and cost penalties of traditional mold changes.
Solution Approach 2:
The patent creates a universal mold plate that can produce multiple different products through variable pin actuation. The same physical mold plate with its array of pins can be reconfigured via magnetic field control to create different surface geometries and product shapes. This multi-functionality eliminates the need for multiple dedicated molds, allowing a single mold plate to serve multiple product lines and enabling rapid adaptation to custom manufacturing requirements.
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 high-resolution mold adjustments without interpolation layers and complex actuators, facilitating rapid shape changes and reducing manufacturing costs.
Implementation Method 1
A variable mold may include a plurality of hydraulic pin systems each having a valve in fluid communication with a supply of actuation fluid... inducing a phase change in the actuation fluid from liquid to solid to fix each pin at the pin's predetermined position
Data Source
AI summary
A method for using a variable mold may include providing a variable mold. The variable mold may include a plurality of hydraulic pin systems each having a valve in fluid communication with a supply of actuation fluid, a tubing in fluid communication with the valve, and a pin coupled to the tubing. The pin may be configured to be displaced in response to the supply of the actuation fluid through the valve to the tubing. The method may further include moving each pin of the plurality of hydraulic pin systems to a predetermined position for that pin by supplying the actuation fluid through the valve to the tubing and inducing a phase change in the actuation fluid from liquid to solid to fix each pin at the pin's predetermined position.