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Introduction to ultrasonic processing research

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Update time : 2019-09-12 19:03:51
Ultrasonic processing technology has developed rapidly. It has extensive research and application in the fields of ultrasonic vibration system, deep hole processing, wire drawing die and cavity die grinding and ultrasonic composite processing, especially in the field of difficult-to-machine materials. Sexual process problems have achieved good results.

The ultrasonic vibration system consists of transducers, horns and tool heads, and is the core part of the ultrasound equipment. In traditional applications, ultrasonic vibration systems mostly use a one-dimensional longitudinal vibration mode and work in a "full tuning" mode. However, in recent years, with the progress of basic research in ultrasonic technology and the special needs of practical applications in different fields, new progress has been made in the working mode, design calculation, vibration mode and application research of vibration system.

A semi-wavelength bending vibration system has been successfully developed in Japan. The cutting tool is mounted on the thin end of the half-wavelength translating vibration system. The piezoelectric ceramic piece of the transducer of the vibration system adopts a semi-circular shape and two upper and lower parts to form two upper and lower parts. Semi-circular piezoelectric transducer (piezoelectric vibrator) is characterized by miniaturization, simple structure and increased rigidity.

Japan has also developed a new type of "longitudinal-bend" type vibration system, which has been successfully applied in hand-held ultrasonic composite vibratory grinding machines. The piezoelectric transducer of the system also uses a semi-circular piezoelectric ceramic piece to produce a "longitudinal-bend" type composite vibration.

Researchers at Kanazawa Institute of Technology in Japan have developed an ultrasonic low-frequency vibration combined drilling system for processing hard and brittle materials. Combining the ultrasonic vibration of the diamond center drill with the low frequency vibration of the workpiece, a combined vibration drilling device is manufactured, which can detect the change of the drilling force and the drilling accuracy and the surface quality of the hole, and use the combined device in different A series of experiments were carried out under the vibration conditions. The experimental results show that combining the ultrasonic vibration of the diamond center drill with the low frequency vibration of the workpiece is an effective method for processing hard and brittle materials.

Southeast University has developed a new ultrasonic vibration cutting system. The system uses a piezoelectric transducer composed of an ultrasonic generator, a matching circuit, a cascaded piezoelectric crystal, a resonant arbor, a support adjustment mechanism, and a cutter. When the generator outputs an ultrasonic voltage, it will cause the cascaded crystal to generate ultrasonic mechanical expansion and contraction, and directly drive the resonant arbor to achieve ultrasonic vibration. The device is characterized by less energy transfer links, reduced energy leakage, and an electromechanical conversion efficiency of up to about 90%, and is simple in structure, small in size, and easy to operate.

Shenyang Institute of Aeronautics and Astronautics established an ultrasonic torsional vibration system for boring, using a magnetostrictive transducer to output the ultrasonic generator at the small end of the torsional horn when longitudinally vibrating the tangential direction of the torsional horn. Torsional vibration in the circumferential direction, Mohs cone and thread connection between the boring tool and the torsional vibration horn, the output power is less than 500W, the frequency is 16~23 kH z, and the frequency has automatic tracking performance.

Northwestern Polytechnical University has designed an ultrasonic vibration grinding device that can process hard and brittle materials on an internal grinding machine. The device is composed of an ultrasonic vibration system, a cooling circulation system, a grinder connection system and an ultrasonic generator, and the ultrasonic transducer adopts a longitudinal composite transducer structure, and the grinding fluid is used as a cooling liquid in the cooling circulation system; the grinding machine connection system It consists of auxiliary support, brake mechanism and internal grinding machine connecting rod. The rotation accuracy of the tool head of the grinding device is ensured by the precision of the inner cylindrical grinding machine spindle. The structure is much simpler than the spindle system of the special ultrasonic grinding machine, so the cost is low and it is suitable for application in production.

Another ultrasonic torsional vibration system has been applied to the "machining center" with an ultrasonic torsional vibration device. It is mainly used for the die-shaped (such as triangular, polygonal) holes and the sharp-point grinding and polishing of the bottom of the groove after EDM, and the special-shaped hole processing of non-conductive materials. The transducer of the vibration system is constructed by using eight sector-shaped piezoelectric ceramic sheets polarized in the circumferential direction to generate torsional vibration.
https://www.infignos.com/templates/updatelistingnow.cfm?email=ryanlee901213@gmail.comShenzhen Kangda Precision Manufacturing Co.,Ltd.,Machining Manufacturer,Shenzhen,FL