MR Fluid Valve Variable Mold for High-Resolution Pin Control
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Solution Overview
Problem
Conventional variable molds have limitations due to low resolution, requiring complex control systems and often necessitating an interpolation layer, which increases costs and complexity in applications where frequent product changes are needed.
Innovation Solution
A variable mold utilizing magnetorheological fluid and valves with a simple control mechanism, featuring a plurality of hydraulic pin systems with MR fluid valves and a controller to manage pin displacement, eliminating the need for an interpolation layer.
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 requires complex control systems with electromechanical actuators, servos, and stepping motors
Solution Approach 1:
The patent replaces complex electromechanical control systems (actuators, servos, stepping motors) with a magnetic field-based control system using permanent magnets and magnetorheological fluid. This substitution achieves high-resolution mold adjustment without mechanical complexity, as magnetic fields can be precisely controlled and adjusted without physical contact or complex actuation mechanisms.
Solution Approach 2:
The patent changes the physical state and properties of magnetorheological fluid through magnetic field application. By varying the magnetic field strength and configuration, the fluid's viscosity and shape-changing properties are dynamically adjusted, enabling high-resolution mold configuration without mechanical actuators. The magnetic parameters (field strength, direction, distribution) directly control the mold surface geometry.
2Manufacturing precision
If conventional variable molds are used, then the mold can be adjusted for different products, but an interpolation layer is required to smooth the surface between each point
Solution Approach 1:
The patent replaces the mechanical interpolation layer with a magnetic field-controlled fluid system. The magnetorheological fluid, when subjected to magnetic fields, naturally forms smooth transitions between different mold points without requiring physical interpolation layers. The fluid's continuous deformability under magnetic influence eliminates the need for additional smoothing components.
3Adaptability or versatility
If frequent mold changes are needed for custom manufacturing and R&D, then product variety increases, but time and money costs increase significantly
Solution Approach 1:
The patent implements a dynamic, reconfigurable mold system using magnetorheological fluid that can be continuously adjusted and reconfigured without physical mold changes. The magnetic field configuration can be dynamically altered to create different mold geometries, enabling rapid adaptation to different products. This eliminates the time-consuming process of physically changing molds while maintaining high adaptability for custom manufacturing and R&D applications.
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 proposed variable mold achieves high resolution without the need for an interpolation layer, simplifies control mechanisms, and reduces costs associated with frequent mold changes, making it suitable for custom manufacturing and R&D applications.
Implementation Method 1
selectively passing an electrical current through the wire coil to increase a viscosity of the magnetorheological fluid
Data Source
AI summary
A variable mold includes a plurality of hydraulic pin systems. Each pin system includes a valve in fluid communication with a supply of pressurized fluid, a tubing in fluid communication with the valve, and a pin coupled to the tubing. The pin is configured to extend from the tubing in response to the supply of the fluid through the valve to the tubing. A longitudinal axis of each pin is mutually parallel and arranged in a two-dimensional array. The variable mold includes a controller operably coupled to the valves that can control the displacement of each pin. The variable mold may include a pin displacement detector configured to detect a displacement of each pin. The pin displacement detector is operably coupled to the controller. The controller can close each valve in response to the pin displacement detector detecting that the pin corresponding to the valve extends a predetermined distance.