The machine tool is mainly used for boring large-diameter heavy-duty deep hole workpieces. The boring method is square push boring, chip discharge forward, and oil supply from the back end of the boring stem. The machine tool bed adopts a rectangular wide bed structure, the main motor adopts a DC motor, and the three gears are stepless speed regulation.
1. Stress and energy concentration
In ultrasonic vibration cutting, there is only a short time to cut in each vibration period, and most of the rest of the time, the cutting tool and workpiece are high, so the relative static cutting time of vibration cutting is short.
2. Workpiece rigidity
When ultrasonic vibration cutting is used, the equivalent elastic number of the whole system is 3-10 times larger than that of the original system under the condition of steady-state cutting, so we can see that vibration cutting is used to improve the rigidity of the workpiece.
3. Friction factor reduction
Vibration cutting can greatly reduce the friction coefficient, so vibration can reduce the static and dynamic friction coefficient between contacting materials; vibration cutting can make the "cavitation" effect of cutting fluid production, so that the cutting fluid can fully play its role; in addition, in the moment without the action of cutting fluid, the front cutter surface generates oxide film, which can also reduce the friction coefficient.
4. Increase of shear angle
In vibration cutting, the crack depth produced by the tool impacting the material to be cut is much larger than the actual cutting length, and the crack will form a deflection angle in front of the tool, thus increasing the actual shear angle.