The ultrasonic drilling and milling machine can greatly reduce the cutting force, reduce the frictional heat, increase the service life, and reduce the surface roughness value of the machined.
First, in the drilling and milling process, the tool head is not always in contact with the workpiece, but in a regular contact and separation state; the regular pulse impact cutting force replaces the continuous cutting force; (or the workpiece) is regularly forced Vibration replaces the irregular self-excited vibration of the workpiece; most of the cutting force comes from the vibration of (or workpiece), and the movement of (or workpiece) is only set to meet the processing geometry.
Second, in vibration drilling and milling, the actual instant drilling and milling speed is increased due to vibration, and the dynamic impact force acts on the workpiece, so that local deformation is reduced, the acting force is concentrated, and the instant cutting force is increased, thereby obtaining a larger wave. The leading shear stress is beneficial to the plastic catalysis of metals; reducing plastic deformation is beneficial to cutting; this advantage is more prominent in the processing of superhard materials.
Third, under the action of ultrasound, it is beneficial to the heat dissipation of high-speed vibration. At the same time, because the front part is periodically separated from the workpiece, it is easier for the cutting fluid to enter between the workpieces, which also increases the heat dissipation capacity of the system.
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