Taking gears and crankshafts as examples, explain how to reduce deformation after quenching with ultrasonic induction quenching equipment?

After the gear is quenched by ultrasonic induction quenching equipment, the deformation of the workpiece can be reduced from the following aspects:

①Prevent the inner hole of the gear from shrinking. Many machine tool factories have summarized their experience in this area. Some machine tool factories require that after gear quenching, the inner hole shrinkage is less than 0.005mm, or less than 0.Olmm. Generally, after high-frequency induction quenching, the inner hole shrinkage often reaches 0.01~0.05mm. Some factories preheat the inner hole of the spline first and then quench the outer teeth. Some factories add a high-temperature tempering process to thick-walled gears after rough turning of the tooth blank, plus high-frequency induction normalizing to generate stress, and then finish turning, spline drawing, gear cutting, shaving, high-frequency induction quenching, and low-temperature tempering. Fire, the shrinkage of the inner hole can be controlled within 0.005mm.

②For gears that are quenched tooth by tooth, the last quenched tooth has the largest deformation. Therefore, the method to reduce deformation by tooth-by-tooth quenching is to use ultrasonic induction quenching equipment to quench alternately, that is, quench one or two teeth apart.

After the crankshaft is quenched by ultrasonic induction quenching equipment, the deformation of the workpiece can be reduced from the following aspects:

①The sequence of crankshaft journal quenching is related to the bending deformation of the crankshaft. There have been many tests at home and abroad on various crankshaft journal quenching sequences. For crankshafts without fillet quenching, some manufacturers believe that the middle part of the connecting rod neck is quenched first, and then the outer part is quenched, so that the deformation is small. However, some use the connecting rod neck to quench the outer edge first, and then quench the middle. In the quenching sequence of the connecting rod neck and main journal, the connecting rod neck is quenched first, and then the main journal is quenched.

② When the crankshaft is quenched using ultrasonic induction quenching equipment, the tailstock tip pressure is related to the deformation. Some current machine tool designs have elastic tailstock tips that allow the crankshaft to expand and contract freely when heated.