Rotary Heating Drum for Uniform Rare Earth Alloy Flake Heat Treatment
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Solution Overview
Problem
Existing alloy flake production systems for rare-earth magnets face challenges in uniformly heating and holding alloy flakes at high temperatures for extended periods, leading to variations in crystal structure and grain size, which are not efficiently addressed by existing heat treatment methods.
Innovation Solution
A rotary heating drum with a switching device for storage and discharge, combined with a rotary cooling drum with fins and coolant circulation, allows for uniform long-time heat treatment of alloy flakes under reduced pressure or inert gas, enabling precise control of the main phase grain size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alloy flakes are subjected to long-time heat treatment to coarsen main phase grain size to 10 μm or greater, then magnetic properties are improved, but uniformity of heat treatment and crystal structure control becomes difficult to maintain
Solution Approach 1:
The patent employs a rotary heating drum that rotates to dynamically move alloy flakes through different thermal zones, ensuring uniform heat distribution throughout the material while maintaining extended heating time for grain coarsening
Solution Approach 2:
The heating drum serves multiple functions simultaneously: it provides heating, rotates to distribute heat uniformly, and the switching device enables both storage and discharge operations within the same apparatus, achieving both grain size control and structural uniformity
2Manufacturing precision
If alloy flakes are held at high temperature for extended periods to achieve desired grain size, then magnetic properties improve, but production time and energy consumption increase
Solution Approach 1:
The rotary heating drum enables continuous processing where alloy flakes are constantly moved through the heating zone, eliminating idle time and maintaining optimal thermal conditions throughout the extended heat treatment period required for grain coarsening
Solution Approach 2:
The switching device prepositions alloy flakes into the heating drum before the extended heat treatment begins, and maintains them in the optimal thermal environment throughout the holding period, ensuring efficient use of the extended time required for grain size control
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 the production of alloy flakes with a main phase grain size of 10 μm or greater, achieving uniform heat treatment and efficient control of crystal structure, reducing variations and improving magnetic properties.
Implementation Method 1
a heating drum for heating fed alloy flakes to a predetermined temperature
Implementation Method 2
heating the fed alloy flakes uniformly while rotating the heating drum
Implementation Method 3
a cooling drum for cooling the alloy flakes discharged from the heating drum
Implementation Method 4
a cooling drum having a structure in which a coolant circulates
Implementation Method 5
heating the fed alloy flakes uniformly while rotating the heating drum
Implementation Method 6
a switching device for switching between storage and discharge of the alloy flakes fed to an inner wall side of the heating drum
Data Source
AI summary
An alloy flake production apparatus (1) includes a crystallinity control device (2) for controlling an alloy crystal structure of fed alloy flakes to a desired state, a cooling device (3) for cooling the alloy flakes discharged from the crystallinity control device (2), and a chamber for keeping these devices under reduced pressure or under an inert gas atmosphere. The crystallinity control device (2) has a rotary heating drum (21) in a cylindrical shape for heating the fed alloy flakes, and a switching device (23) for switching between storage and discharge of the alloy flakes fed to an inner wall side of the heating drum (21), so that long-time heat treatment is uniformly applied to the alloy flakes immediately after being made by ingot crushing. The heating drum (21) preferably has a scooping blade plate (22) for scooping up alloy flakes fed to the inner wall side with its rotation.