YCB arc gear pump gear in the workpiece by the torsion and bending and Other alternating load, the impact of load, its surface layer to withstand higher stress than the heart. In the case of friction, the surface layer is also constantly worn, so some parts of the surface layer of high strength, high hardness, high wear resistance and high fatigue limit and other requirements, only the surface hardening to meet the above requirements. As a result of surface hardening with small deformation, high productivity, it is widely used in production. YCB arc gear pump gear quenching principle: the workpiece into the inductor (coil), when the inductor leads to a certain frequency of alternating current, the surrounding alternating magnetic field. The electromagnetic induction of the alternating magnetic field causes a closed induced current in the workpiece ─ ─ eddy current. The distribution of induced current in the workpiece cross-section is very uneven, the current density of the workpiece surface is high, gradually reduced inward, a phenomenon called skin effect. The surface of the workpiece high-density current electric energy into heat, so that the surface temperature, that is, to achieve surface heating. The higher the current frequency, the greater the current density difference between the surface of the workpiece and the internal, the thinner the heating layer. In the heating layer temperature exceeds the critical temperature of steel after rapid cooling, surface hardening can be achieved.
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