Ferrite Sintered Magnet Composition for Higher Cutting Speed
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Solution Overview
Problem
Existing ferrite sintered magnets face challenges in achieving high cutting speeds, which hinder productivity improvements.
Innovation Solution
A ferrite sintered magnet composition comprising magnetoplumbite type ferrite crystal grains with a specific atomic ratio of Co to La in the grain boundary phase relative to the crystal grains, along with a method involving calcining, pulverizing, mixing additives, and firing to enhance cutting speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ferrite sintered magnet composition is used, then manufacturing process is simple, but cutting speed is low and productivity is poor
Solution Approach 1:
The patent applies local quality by creating a specific compositional gradient where the grain boundary phase has a different Co/La atomic ratio (0.5≤RGB/RFG≤0.9) compared to the ferrite crystal grains. This localized compositional difference at the grain boundaries improves cutting speed without fundamentally changing the overall magnet structure, thus resolving the contradiction between productivity improvement and composition complexity.
Solution Approach 2:
The patent changes the compositional parameters by controlling the Co/La atomic ratio relationship between grain boundary phase (RGB) and ferrite crystal grains (RFG). By setting the specific parameter range 0.5≤RGB/RFG≤0.9, the patent optimizes cutting speed while maintaining a manageable composition complexity through quantitative parameter control rather than qualitative structural changes.
2Productivity
If cutting speed is increased, then productivity is improved, but manufacturing precision may deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-optimizing the compositional structure (controlling Co/La ratios in grain boundaries) before the cutting process. This preliminary compositional optimization creates a material structure that is inherently more suitable for high-speed cutting, allowing productivity improvement without sacrificing cutting precision because the material properties are prepared in advance to accommodate faster machining.
Solution Approach 2:
By changing the compositional parameters (Co/La atomic ratios) of the ferrite magnet, the patent modifies the material properties to enable higher cutting speeds. The specific parameter control (0.5≤RGB/RFG≤0.9) ensures that the material maintains adequate structural integrity and magnetic properties even at increased cutting speeds, thus preventing deterioration of manufacturing precision.
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 magnet design and manufacturing method significantly increase cutting speed, enabling higher productivity and improved magnetic characteristics.
Implementation Method 1
A ferrite sintered magnet including magnetoplumbite type ferrite crystal grains and a grain boundary phase interposed between the ferrite crystal grains
Data Source
AI summary
Provided is a ferrite magnet including: magnetoplumbite type ferrite crystal grains; and a grain boundary phase interposed between the ferrite crystal grains. The ferrite crystal grains and the grain boundary phase respectively contain a metal element A, La, Co, and Fe, the metal element A is at least one kind of element selected from the group consisting of Sr, Ba, and Ca, and when an atomic ratio of Co to La in the ferrite crystal grains is set as RFG, and an atomic ratio of Co to La in the grain boundary phase is set as RGB, the following expression is satisfied.0.5≤RGB/RFG≤0.9