Rotary Tray Infiltration Device for NdFeB Magnet Temperature Uniformity
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Solution Overview
Problem
Existing high temperature vacuum furnaces used for surface infiltration of Dysprosium and Terbium on NdFeB magnets suffer from temperature inconsistencies, leading to variations in the thickness and quality of infiltration layers, which affect the performance consistency of the magnets.
Innovation Solution
An infiltration device with an annular groove heating room and a rotary tray system that allows for equal-distance heating and controlled temperature uniformity, using a rotary bracket and transmission device to ensure consistent heating and cooling of magnets, along with a controller for precise temperature control and argon gas cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnets are stationary in the furnace body during infiltration treatment, then the structure is simple, but temperature distribution becomes uneven and infiltration layer quality deteriorates
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary furnace structure into a dynamic rotating system. The tray holding multiple magnets rotates during infiltration treatment, causing the magnets to periodically change positions relative to the heat source. This dynamic motion ensures that all magnets experience relatively uniform heating conditions, eliminating the temperature distribution problems associated with stationary arrangements while maintaining structural simplicity.
2Speed
If magnets at different positions are heated differently, then heating speed is fast, but temperature consistency deteriorates and infiltration quality varies
Solution Approach 1:
The rotating tray dynamically redistributes magnets during heating, ensuring that magnets initially at different positions (and thus experiencing different heating rates) are continuously repositioned. This dynamic motion equalizes the thermal history of all magnets, achieving consistent temperatures and infiltration qualities across the batch while maintaining high heating speeds.
Solution Approach 2:
The periodic rotation of the tray creates cyclic exposure of different magnets to the heat source, ensuring that all magnets receive comparable cumulative heating over time. This periodic action compensates for initial position differences and achieves uniform temperature distribution throughout the infiltration process.
3Productivity
If multiple magnets are processed simultaneously in a conventional furnace, then productivity increases, but temperature control precision deteriorates
Solution Approach 1:
The rotating tray system enables simultaneous processing of multiple magnets while maintaining temperature control precision through continuous motion. The rotation ensures that no single magnet remains in a fixed position that would cause overheating or underheating, thereby achieving both high productivity and precise temperature control across all magnets processed in batch.
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 ensures consistent temperature conditions across all magnets, improving the uniformity of infiltration layers and the performance of finished products, while reducing energy consumption and shortening production cycles.
Implementation Method 1
heating members disposed at both sides of an inner wall of the annular groove... perform equal-distance heating on the material box from both sides
Implementation Method 2
heat is transferred from the magnets placed at an outer layer to the magnets placed at an inner layer
Implementation Method 3
a surface layer of the heating room temperature keeping member is a reflective screen
Implementation Method 4
argon gas cooling
Implementation Method 5
heat is transferred from the magnets placed at an outer layer to the magnets placed at an inner layer
Implementation Method 6
high temperature vacuum infiltration furnace... vacuum-pumping
Implementation Method 7
Infiltration of Dysprosium and Terbium into a certain depth range from the surface layer of the magnet
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention discloses an infiltration device and method. The infiltration device comprises a heating room (20), a rotary tray (10), a rotary bracket (110), a material box (410), an elevating mechanism and a transmission device (310), wherein the heating room (20) is an annular groove, and the rotary tray (10) is arranged below an opening end at a lower end of the heating room (20); the rotary bracket (110) is installed on the rotary tray (10); the material box (410) is arranged on the rotary bracket (410); the rotary tray (10) and the material box (410) can move upward and downward under the action of the elevating mechanism; the rotary bracket (110) can spin in the annular groove and revolve around a central axis of the rotary tray (10) under the action of the transmission device (310). The infiltration method provided by the invention comprises the steps of charging, vacuum-pumping, high temperature infiltrating, cooling, discharging, etc. The infiltration device and method of the invention not only realize equality of the condition on the position of magnets, but also realize equality of the condition on the heating environment, thereby achieving consistency of the temperature condition necessary for sintered magnets during high temperature infiltration and air-cooling, and ensuring consistency of the performance of the products.