Universal rotating ultrasonic transducer assembly for high-speed electric spindle

Abstract

The invention relates to a general rotating ultrasonic transducer assembly of a high-speed motorized spindle. In most of the prior art, a current collector carbon brush structure or electromagnetic induction is adopted for supplying power to a transducer, and with the same power, the transducer is excessively large in size and low in efficiency and can not operate at a high speed. The general rotating ultrasonic transducer assembly comprises a connecting shaft, a transducer shell, a magnetic resonance transmitter static unit, a magnetic resonance receiver rotating unit and integrated ultrasonic transducer, wherein the connecting shaft and the transducer shell are of an integrated structure, the magnetic resonance transmitter static unit and the magnetic resonance receiver rotating unit are coaxially fixed to the connecting shaft, and the integrated ultrasonic transducer is coaxially fixed in the transducer shell. The transducer comprises an upper cover plate, a piezoelectric element, a lower cover plate of an integrated structure, an amplitude transformer and a cutting tool chuck. According to the technical scheme, a magnetic resonance transmitter in the magnetic resonance transmission state has the recognition characteristic and will not transmit energy to the peripheral metal shell to cause heating, and the transmission efficiency and the reliability are improved; the distance between the rotary unit and the static unit can be freely set within the range of several millimeters, and therefore the assembly difficulty of a whole machine is lowered.

Description

technical field [0001] The invention belongs to a processing device for special processing, in particular to a general-purpose rotating ultrasonic transducer assembly of a high-speed electric spindle. Background technique [0002] It has been more than 180 years since humans first used gear friction to generate 24KHz ultrasound. With the advancement of science and technology and the needs of related disciplines, this ancient and young subject has applied its technology to industrial and agricultural production, national defense, medical treatment, scientific research, etc. It can be seen everywhere, and its irreplaceability has been fully proved its own advantages. [0003] Ultrasonic rotary machining is an important branch of applied acoustics and belongs to the category of special processing. It is aimed at materials that cannot be processed or are difficult to process by ordinary methods, such as: optical glass, ceramics, YAG yttrium aluminum garnet, sapphire, artificial...

AI Technical Summary

Problems solved by technology

At present, most of the known technologies are still based on the carbon brush structure of the collector ring or the power supply to the transducer through electromagnetic induction. Under the same power, the volume of the transducer is too large, and the efficiency is low and cannot run at high speed, which restricts this technology in high-speed operation. Application on electric spindle

The former feeds power to the transducer by contacting the collector ring with the carbon brush. The disadvantage is that the carbon brush is easy to wear, and the falling carbon chips are easy to short-circuit the collector ring and cause failure. At the same time, the carbon brush and the collector ring generate friction heat during high-speed operation. , making it difficult to increase the speed, regular maintenance, cleaning, and replacement of carbon brushes are required, which brings inconvenience and additional costs to users

The latter electromagnetic induction method, although the collector ring and carbon brushes are discarded, its transmission efficiency is not high, and the distance between the dynamic and static sensors is strict during dynamic work

The stability is poor when the displacement and frequency change, and there is no ability to identify the transmission object. It is easy to transmit energy to the surrounding metal such as the shell, causing heat and energy loss, resulting in low efficiency.

[0009] In addition, in the known transducer structure, there is no acoustic reflective coating between the upper cover plate and the piezoelectric element, and the emission efficiency of the piezoelectric element is low at the same unit volume. Therefore, when the volume of the piezoelectric element is too small, the radiated Power and conversion efficiency are not improved

Images