Overview
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A high-frequency heat treatment is used to process a variety of machine
parts since it has high thermal efficiency and has fewer harmful effects
such as oxidization.
When the high-frequency heat treatment is applied to the steel wire, the
maximum temperature of the steel wire and the temperature variation at
the time of quenching significantly affects the strength and toughness
of the steel wire.
In JMAG, the eddy current loss density distribution obtained by magnetic
field analysis can be used as a heat source for thermal analysis.
This note presents the use of coupled magnetic field analysis and thermal
analysis to obtain the temperature distribution and the temperature variation
of the steel wire. |
Eddy Current Loss Density Distribution
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Figure 1 shows the eddy current loss density distribution of the steel
wire and the coil. Magnetic field generated by the coil produces eddy currents
in the steel wire. This eddy currents heat the steel wire as a heat source.
Eddy currents are distributed on the surface of the steel wire due to the
skin effect. |
Temperature Distribution of the Steel Wire
| Figure 2 shows the temperature distribution of the steel wire at the position
of A, B, C, D and E. Eddy currents are concentrated on the surface of the
steel wire, so the surface is heated first and the heat is transferred
gradually from the surface to inside the steel wire. |
Closeup |
Temperature Variation of the Steel Wire
Closeup |
Figure 3 shows the temperature variation at the surface and inside the
steel wire. According to the graph, the maximum temperature is around 800
degrees Celsius both at the surface and inside the steel wire. The temperature
rises differently at the surface and inside. The surface is seen to be
heated first as is also shown in the Figure 2. |
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