Single-excitation ultrasonic elliptical vibration micro-machining work platform

A technology of elliptical vibration and working platform, which is applied in the directions of worktable, fluid using vibration, manufacturing tools, etc., can solve the problems of ultrasonic machining resonance frequency drift, unstable processing quality, and reduced processing efficiency, so as to improve work reliability, Simple structure, stable vibration performance

Inactive Publication Date: 2015-04-01
SUZHOU UNIV OF SCI & TECH
4 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

In 2007, Zhao Bo et al. proposed a two-dimensional ultrasonic vibration auxiliary processing device for processing large structural parts, which applied ultrasonic vibrations in two directions to the workpiece through two generators respectively. Many aspects have shown excellent performance, but this technology has the phenomenon that the vibration velocity is unstable when the load, temperature and cutting conditions change...
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Abstract

The invention discloses a single-excitation ultrasonic elliptical vibration micro-machining work platform. The single-excitation ultrasonic elliptical vibration micro-machining work platform comprises a vibration isolation platform, a transverse moving work platform, a longitudinal moving work platform, a shell unit, an ultrasonic vibration transducer, an ultrasonic wave power supply, an elliptical vibration mode converter and a small work platform, wherein the ultrasonic vibration transducer is placed in the shell unit; the small work platform is arranged at the front end of the elliptical vibration mode converter; the shell unit comprises a front baffle, a sleeve and a rear baffle; the ultrasonic vibration transducer comprises a bolt, a rear cover plate, a piezoelectric ceramic piece, an electrode plate and a front cover plate; the rear cover plate, the piezoelectric ceramic piece, the electrode plate and the front cover plate sequentially sleeve the bolt; the rear cover plate, the piezoelectric ceramic piece, the electrode plate and the front cover plate are connected to one another and are tightly pressed together via the bolt; the elliptical vibration mode converter is arranged at the front end of the front cover and has a wedge-shaped structure; and longitudinal ultrasonic vibration generated by the ultrasonic vibration transducer can be converted into longitudinal and bent composite ultrasonic elliptical vibration at the tail end of the elliptical vibration mode converter and on the small work platform by the elliptical vibration mode converter, so that workpieces on the small work platform can be driven to perform ultrasonic elliptical vibration.

Application Domain

Technology Topic

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  • Single-excitation ultrasonic elliptical vibration micro-machining work platform
  • Single-excitation ultrasonic elliptical vibration micro-machining work platform
  • Single-excitation ultrasonic elliptical vibration micro-machining work platform

Examples

  • Experimental program(1)

Example Embodiment

[0021] Combine figure 1 , 2 , 3 and 4, the single excitation ultrasonic elliptical vibration micro-machining work platform includes a vibration isolation platform 15, a laterally movable work platform 14 connected above the vibration isolation platform 15 by bolts, and a horizontally movable work platform 14 connected by bolts. Longitudinal mobile working platform 13, housing unit, ultrasonic vibration transducer placed in the housing unit, ultrasonic power supply 12, elliptical vibration mode converter 7 and small working platform 8 arranged at the front end of elliptical vibration mode converter 7 . An auxiliary support 16 is provided below the end of the elliptical vibration mode converter 7, and a rolling support body 17 is provided between the end of the elliptical vibration mode converter 7 and the auxiliary support 16. The housing unit is connected above the longitudinally movable working platform 13 by bolts, and the working strokes of the laterally movable working platform 14 and the longitudinally movable working platform 13 are both 100 mm.
[0022] The housing unit includes a front baffle 9, a sleeve 10, and a rear baffle 11; the outer contour of the ultrasonic vibration transducer is cylindrical, and it includes a bolt 1 and a rear cover sequentially sleeved on the bolt 1 The plate 2, the piezoelectric ceramic sheet 3, the electrode sheet 4 and the front cover plate 5. The front cover plate 5 is provided with a flange 6 for connection with the housing unit. The rear cover plate 2 and the front cover plate 5 are connected by bolts 1 The back cover 2, the piezoelectric ceramic sheet 3, the electrode sheet 4 and the front cover 5 are connected and compressed to form the energy conversion part of the ultrasonic vibration transducer, which can convert the ultrasonic electrical signal output by the ultrasonic power supply 12 into ultrasonic vibration conversion. The longitudinal ultrasonic vibration of the energy device. The ultrasonic vibration transducer has only one set of longitudinal vibration piezoelectric ceramic sheet 3, the diameter of the piezoelectric ceramic transducer section is 30mm, the piezoelectric ceramic sheet 3 is PZT-8, the size is: Ф30×Ф15×5 , The number of piezoelectric ceramic sheets 3 is 2.
[0023] The elliptical vibration mode converter 7 and the front cover plate 5 are made as an integral part and are arranged at the front end of the front cover plate 5. The elliptical vibration mode converter 7 is an oblique wedge structure as a whole, and the oblique wedge structure elliptical vibration mode converter 7 is original The whole is a rectangular parallelepiped, and the side length of the section is 15 X 15mm, 40mm in length, one side of which is cut off along the axis of the ultrasonic vibration transducer to form an oblique wedge structure. Of the two sides forming an oblique wedge, the uncut side is parallel to the axis of the ultrasonic vibration transducer. The other side that has been cut forms an angle of 10 degrees with the axis of the ultrasonic vibration transducer. A transition arc is provided at the joint between the elliptical vibration mode converter 7 and the front cover plate 5 of the ultrasonic transducer. The arc radius is 5mm. The two sides of the elliptical vibration mode converter 7 with the oblique wedge structure are similar to the trapezoid. The plane to be processed is parallel.
[0024] The small working platform 8 is set on the front end of the elliptical vibration mode converter 7 by welding; when the ultrasonic vibration energy is transferred from the ultrasonic vibration transducer to the end of the elliptical vibration mode converter 7, it is converted into a longitudinal vibration and a certain phase difference. The longitudinal and bending composite ultrasonic elliptical vibration of the combined bending vibration, that is, the longitudinal and bending composite ultrasonic elliptical vibration at the end of the elliptical vibration mode converter 7; and the small working platform 8 and the end of the elliptical vibration mode converter 7 are driven together to perform ultrasonic elliptical vibration , And then drive the workpiece on the small workbench to perform ultrasonic elliptical vibration. The work surface of the small workbench 8 is 12 X 8mm, the workpiece can be glued on the workbench with paraffin or glue, or connected to the workbench with screws or pressure plates.
[0025] The ultrasonic vibration transducer is placed in the housing unit, the flange 6 of the ultrasonic vibration transducer is arranged in the upper recess of the sleeve 10, and the front baffle 9 is arranged on the other side of the flange 6, and the whole The ultrasonic vibration transducer plays a fixed role, and the rear baffle 11 is arranged at the other end of the sleeve 10 without a stop,
[0026] After the ultrasonic vibration transducer and the elliptical vibration mode converter 7 are connected, the natural frequency is 19.84KHz, the impedance is 83 ohms, the dynamic resistance is 19 ohms, the output voltage range of the ultrasonic power supply 12 is 0-400V, and the current range is 0-4A , The output frequency is 19.84±0.01KHz, and the ultrasonic power supply 12 has an automatic frequency tracking function within the specified frequency range.
[0027] Combine Figure 5 As shown, during operation, the electrode sheet 4 of the ultrasonic vibration transducer is connected to the ultrasonic power source 12. When the electrode sheet 4 of the ultrasonic vibration transducer is connected to the electrical signal output by the ultrasonic power source 12, due to the inverse of the piezoelectric ceramic sheet 3 Piezoelectric effect, the piezoelectric ceramic sheet 3 will generate longitudinal ultrasonic vibration, that is, the ultrasonic vibration transducer converts the electrical energy output by the ultrasonic power supply 12 into longitudinal ultrasonic vibration, and drives the entire ultrasonic vibration transducer system to perform longitudinal ultrasonic vibration. After the vibration energy is transferred from the ultrasonic vibration transducer to the end of the elliptical vibration mode converter 7, it is converted into a longitudinal and bending composite ultrasonic elliptical vibration with a certain phase difference, that is, converted into an elliptical vibration mode converter. 7 The longitudinal and bending composite ultrasonic elliptical vibration at the end; and the small working platform 8 and the elliptical vibration mode converter 7 end together to perform ultrasonic elliptical vibration.
[0028] When the applied voltage runs for 10 minutes, the single excitation ultrasonic elliptical vibration micro-machining work platform reaches a stable vibration state. At this time, the stable output voltage of the ultrasonic power supply 12 is 220V, the current is 1.35A, and the ultrasonic is measured by the laser Doppler vibrometer. The amplitudes of the long and short axis of the elliptical vibration are 14.3 microns and 5.2 microns, respectively, and the signal measured by the laser Doppler vibrometer is graphically calculated through the dual trace oscilloscope with Lissajous graphic operation function, and the ultrasound with the long and short axis ratio of 2.73 can be obtained. The elliptical vibration track fully meets the requirements of the ultrasonic elliptical vibration micro-processing work platform.
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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