Due to the structural specificity of the spline shaft, it is determined that the heating method can only be a continuous heating method. From the top to the bottom of the transition arc position, the intermediate frequency induction heating device can realize the relative position movement between the inductor and the workpiece, thus achieving the relative movement of the two during the heating process, which can ensure the inductor and the heating. The relative distance of the surface remains the same to increase the heating effect.
Because the cross section of the quenching part of the spline shaft changes greatly, and the hardening layer is evenly ensured, only the preheating and heating methods can be used. After the preheating of the spline shaft flange to the top of the shaft body, the sensor is again Go back to the bottom and reheat it. Use low power for preheating and high power for heating. During the entire production process, when the inductor is at the bottom of the heating, because the flange has an endothermic effect, the inductor needs to be at the bottom for a certain period of time to ensure its heating effect.
Most manufacturers use oil-cooling processes, but this process can easily cause fires and cannot meet the needs of large-volume production. Later, the AQ251 quenching medium was used, and its concentration was controlled between 10% and 15%. The heating time, the concentration of the medium, the pressure of the injection and the cooling time can be automatically controlled according to the demand. The sprayer is spray-quenched, and the length of the bottom of the spline shaft is basically the same. After the sensor and the shower are fixed, the relative position is unchanged, so as to ensure that all parts can be sprayed in time after heating. cool down.
