Hybrid Magnetorheological Polishing Device for Heat-Free Field Control
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Solution Overview
Problem
Existing magnetorheological polishing techniques for large-caliber intense light elements face low material removal efficiency and long machining cycles, with electromagnetic devices generating excessive heat and permanent-magnet devices having inflexible magnetic field distribution and space constraints.
Innovation Solution
A permanent magnet-electromagnet hybrid array type magnetorheological polishing device with a main excitation device comprising permanent magnets and fine-adjustment electromagnetic excitation devices, allowing for adjustable magnetic field distribution and efficient recycling of magnetorheological fluid, reducing device size and improving polishing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electromagnetic magnetorheological polishing devices are used to generate magnetic field by applying intense current to multi-turn coils, then the magnetic field can be generated and controlled, but a large quantity of heat will be produced leading to temperature rise of magnetorheological fluid, severely compromising the efficacy of the magnetorheological fluid and reducing polishing quality
Solution Approach 1:
The patent replaces the electromagnetic system (electromagnets) with a permanent magnet system to generate the magnetic field. This substitution eliminates the need for intense current through multi-turn coils, thereby avoiding heat generation and temperature rise of the magnetorheological fluid, while still providing the necessary magnetic field for polishing operations
Solution Approach 2:
The patent extracts and removes the heat-generating electromagnetic components (coils and electromagnets) from the system, retaining only the essential magnetic field generation function through permanent magnets. This extraction eliminates the harmful thermal effect while preserving the core polishing capability
2Temperature
If cooling water tank is designed to solve heat problem, then temperature control is improved, but the water tank and electromagnets will occupy a large space of the electromagnetic magnetorheological polishing device, the increase in size and weight will greatly reduce the dynamic characteristics
Solution Approach 1:
The patent extracts and removes both the cooling water tank and electromagnets from the system by using permanent magnets instead. This eliminates the need for active cooling while reducing device weight and size, thereby improving dynamic characteristics without compromising temperature control (since permanent magnets generate no heat)
Solution Approach 2:
The patent replaces the electromagnetic system requiring active cooling with a passive permanent magnet system. This substitution eliminates the cooling water tank and associated weight, while maintaining effective magnetic field generation for polishing operations
3Loss of energy
If permanent magnets are used to generate magnetic field, then heat production is eliminated and space is saved, but once the permanent magnets are magnetized, the magnetic field intensity will not be changed, the magnetic field distribution will not be adjusted, and when the magnetic poles are expanded, magnetic field distributions on two sides are asymmetric
Solution Approach 1:
The patent introduces adjustable electromagnetic excitation devices that can dynamically change the magnetic field intensity and distribution by controlling the current magnitude. This dynamic adjustment capability allows the magnetic field to be optimized for different polishing requirements while the permanent magnets provide the base magnetic field without heat generation
Solution Approach 2:
The patent merges the advantages of both permanent magnets (no heat generation, compact size) and electromagnets (adjustable magnetic field intensity and distribution). The hybrid configuration combines permanent magnets for base field generation with electromagnetic excitation devices for fine-tuning and adaptation to different polishing scenarios
4Productivity
If magnetic poles of permanent-magnet magnetorheological polishing devices are expanded by adding two magnetic poles with opposite polarities in parallel, then more polishing ribbons can be formed, but occupying more space and causing asymmetric magnetic field distributions
Solution Approach 1:
The patent uses adjustable electromagnetic excitation devices to create multiple polishing ribbons without physically expanding the permanent magnet array. By dynamically controlling the magnetic field distribution through electromagnetic excitation, multiple effective polishing zones can be formed within the same physical space, improving productivity without increasing device footprint
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 solution enhances material removal efficiency and surface accuracy while reducing device size and weight, enabling high-accuracy and high-quality machining with improved magnetic field control and fluid recycling.
Implementation Method 1
The auxiliary permanent magnet sets are used for driving magnetorheological liquid to be recycled
Implementation Method 2
driving magnetorheological liquid to be recycled
Implementation Method 3
fine-adjustment electromagnetic excitation devices connected with the main excitation permanent magnets
Implementation Method 4
the magnetorheological fluid will turn to a semi-solid state in the presence of a magnetic field
Data Source
AI summary
The disclosure relates to a permanent magnet-electromagnet hybrid array type magnetorheological polishing device, comprising a polishing mechanism, a main excitation device arranged on the polishing mechanism, and auxiliary permanent magnet sets used for driving magnetorheological liquid to be recycled. The main excitation device is a permanent magnet-electromagnet hybrid array comprising main excitation permanent magnets and fine-adjustment electromagnetic excitation devices connected with the main excitation permanent magnets. Each fine-adjustment electromagnetic excitation device comprises a coil and a coil retaining pile. The main excitation device further comprises a permanent magnet-electromagnet device connecting plate made from a non-magnetically conductive material. The disclosure can improve magnetorheological polishing efficiency, reduce the size of the excitation device, and balance and control the thickness of a ribbon array, thus realizing high-accuracy and high-quality machining of the surfaces of elements and recycling of magnetorheological liquid.