Soft Magnetic Iron Composition Using MnSe for Cut Machinability
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Solution Overview
Problem
Conventional techniques that improve machinability by cutting in soft magnetic iron through MnS or FeS precipitates often lead to degradation in magnetic properties, limiting the achievement of both high magnetic properties and machinability.
Innovation Solution
Incorporating MnSe into the chemical composition of soft magnetic iron, with specific limits on elements like C, Si, Mn, P, S, Al, N, and Se, to enhance machinability without degrading magnetic properties, along with optional additions of Cu, Ni, Cr, Mo, V, Nb, Ti, Pb, Bi, Te, Ca, Mg, Zr, and REM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If MnS or FeS precipitates are increased to improve machinability by cutting, then machinability is improved, but magnetic properties are degraded
Solution Approach 1:
The patent changes the chemical composition parameters by introducing Se (selenium) as a new element and adjusting the ratios of existing elements (Mn: 0.01-0.50%, S: 0.001-0.050%, Se: 0.001-0.30%). This parameter change creates a new precipitate phase (MnSe) with different properties than conventional MnS or FeS, achieving improved machinability while maintaining magnetic properties through controlled compositional adjustment
Solution Approach 2:
The patent creates a composite microstructure containing multiple precipitate phases (MnS, FeS, and MnSe) within the soft ferrite matrix. The specific combination and controlled distribution of these precipitates produce a composite effect where MnSe provides superior machinability benefits without the magnetic property degradation associated with higher concentrations of MnS or FeS alone
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 approach allows for soft magnetic iron with excellent magnetic properties and machinability by cutting, as demonstrated by improved magnetic flux density, coercive force, and cold workability, while maintaining iron loss properties and refining costs.
Implementation Method 1
the use of MnSe can improve the machinability by cutting without degradation in magnetic properties
Data Source
AI summary
Provided is a technique that can achieve both magnetic properties and machinability by cutting at a high level, which has been impossible with only the conventional techniques of improving the machinability by cutting using MnS or the like. A soft magnetic iron comprises a chemical composition containing, in mass %, C: 0.02% or less, Si: 0.15% or less, Mn: 0.01% or more and 0.50% or less, P: 0.002% or more and 0.020% or less, S: 0.001% or more and 0.050% or less, Al: 0.05% or less, N: 0.0100% or less, and Se: 0.001% or more and 0.30% or less, with a balance consisting of iron and inevitable impurities.