A general-purpose frequency-matched longitudinal-torsional compound ultrasonic vibration milling and drilling device

Abstract

A general-purpose frequency-matched longitudinal-torsional compound ultrasonic vibration milling and drilling device, including a machine tool spindle, a spindle housing, an ultrasonic power supply, an ultrasonic wireless power transmission system, a mounting sleeve, a sleeve, a longitudinal ultrasonic vibration transducer, and a hollow spiral Groove horn, elastic collet, compression nut and cutter; the present invention changes the volume of fluid in the cylindrical groove by adjusting the position of the rubber plug and the sealing ring, or changes the type of fluid, etc., to change the longitudinal-torsional composite ultrasonic The quality of the vibrator is used to compensate for the loss or increase of the frequency when different tool bars are clamped, so as to achieve the consistency of the resonance frequency, vibration mode and vibration shape of the ultrasonic device when clamping different tool bars, which greatly improves the universality of the device. sex. Moreover, the effects of longitudinal vibration and torsional vibration are enhanced to a certain extent, which greatly improves work efficiency and better exerts the advantages of longitudinal and torsional compound vibration.

Description

technical field [0001] The invention belongs to the technical field of precision and ultra-precision finishing, and in particular relates to a universal frequency-matched longitudinal-torsional composite ultrasonic vibration milling and drilling device. Background technique [0002] Compared with ordinary machining, ultrasonic vibration machining has the advantages of reducing cutting force, reducing tool wear, improving workpiece surface machining accuracy and improving machining efficiency. Traditional ultrasonic machining is mostly a single vibration mode. However, with the development of ultrasonic machining technology and continuous improvement of equipment, composite vibration modes such as longitudinal-torsion, longitudinal-bend and torsion-bend have also received extensive attention. Studies have shown that milling under the ultrasonic longitudinal-torsional composite vibration mode can further reduce the cutting force during the cutting process, improve the efficien...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly two methods to realize longitudinal-torsional composite ultrasonic vibration. One is to polarize the piezoelectric ceramic along the tangential direction, but it is technically difficult to achieve. The usual method is to first cut the piezoelectric ceramic sheet into several fan-shaped sheets, Separately tangentially polarize each sector-shaped piezoelectric ceramic sheet, and then bond each sector-shaped piezoelectric ceramic sheet together. This method is complex in process, high in scrap rate, and prone to incomplete polarization of the ceramic sheet, electrical breakdown, etc. The problem is that it is difficult to manufacture an ideal transducer; the second is to carry out a special design on the structure of the horn, such as the chute type, etc., but it is found in practical applications that the torsional vibration component of this method is small, and the longitudinal vibration component cannot be fully utilized. The advantages of torsional composite ultrasonic vibration, the processing efficiency is low, so that the processing effect is limited

[0004] At present, due to the limitations of processing conditions and resonance frequency, the universality of longitudinal-torsional composite ultrasonic milling and drilling devices is poor, and the restrictions on clamped tool bars (milling cutters, drills, etc.) are relatively strict

Clamping tool bars of different materials and diameters and the extension length of tool bars will affect the resonance frequency of the ultrasonic device. The ultrasonic vibrator vibrates in other modes, and the vibration shape of the ultrasonic vibration changes, which has a greater impact on the processing of the workpiece. Therefore, a set of longitudinal-torsional compound ultrasonic milling and drilling devices is often limited to several or even one tool material and diameter, and its versatility is poor.

However, in actual processing, a variety of cutting tool bars are required to be used together, so multiple longitudinal-torsional composite ultrasonic milling and drilling devices are required, which greatly increases the processing cost and reduces the processing efficiency.

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