The characteristics of rotary ultrasonic machining

The characteristic of rotary ultrasonic machining is that its ultrasonic head rotates with the spindle during operation. A large number of experimental results have shown that during the machining process, simple tool rotation or ultrasonic vibration have relatively poor material removal effects, and after combining the two, the situation has greatly improved. Compared with traditional ultrasonic machining, rotary ultrasonic machining has the following advantages:

(1) Fast processing speed. Ultrasonic rotary machining retains the advantages of traditional ultrasound, that is, both conductive and non-conductive materials can be processed, with a processing speed of over 100mm/min. The processing speed of ultrasonic rotary machining is 10 times that of traditional machining and 6-10 times that of traditional grinding.

(2) The processing is simple and feasible. Ultrasonic vibration reduces the friction coefficient between the tool and the machined surface, reduces cutting force, and makes the structure of the machining machine simple.

(3) Smooth chip removal, drilling processing, no need for tool retraction and chip removal, easy to achieve mechanization. Hydraulic impact and rotational motion promote the discharge of debris, while the hydraulic impact and rotational motion formed by the reciprocating impact of tools keep debris in motion, preventing the deposition process of debris and promoting the flow of debris in the working fluid. When the tool is close to the workpiece, the old working fluid leaves the processing area with debris. When the tool leaves the workpiece, the new grinding fluid enters the processing area, so as to achieve the Dynamic equilibrium of the grinding fluid in the processing area and ensure the processing.

(4) High machining precision. If CNC ultrasonic drilling is used to process glass small holes with a diameter of 1.6mm and a depth of 150mm, the accuracy is 0.005mm roundness and 0.02mm cylindricity.

(5) The machined surface quality is good. Due to the fact that the machining process does not generate a harmful high-temperature area, does not cause chemical or electrical changes on the surface of the workpiece, and the residual compressive stress generated on the surface of the workpiece can improve the fatigue strength of the processed part.

(6) The greater the brittleness of the processed material, the easier it is to process; The harder or stronger the material, the greater its toughness, and the more difficult it is to machine.

(7) Tools have low wear and long service life.

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