THREE-DIMENSIONAL ULTRASONIC ELLIPTICAL VIBRATION CUTTING DEVICE

Abstract

A novel three-dimensional ultrasonic elliptical vibration cutting device, comprising has a two-dimensional ultrasonic vibration transducer, an asymmetric ultrasonic horn, and a cutter. The cutter is installed at the output end of the asymmetric ultrasonic horn, the two-dimensional ultrasonic vibration transducer is used for outputting ultrasonic longitudinal-flexural complex vibration, the asymmetric ultrasonic horn is used for converting and decomposing longitudinal vibration output by the two-dimensional ultrasonic vibration transducer into second-phase flexural vibration and longitudinal vibration, and outputting a three-dimensional ultrasonic elliptical vibration trajectory on the cutter in combination with first-phase flexural vibration output by the two-dimensional ultrasonic vibration transducer. A three-dimensional ultrasonic elliptical vibration trajectory is output in a double-excitation mode. The output three-dimensional ultrasonic elliptical vibration trajectory is adjusted according to different cutting applications and machining requirements so that the device has better adaptability.

Claims

1. A novel three-dimensional ultrasonic elliptical vibration cutting device, comprising a two-dimensional ultrasonic vibration transducer, an asymmetric ultrasonic horn, and a cutter, wherein the cutter is installed at an output end of the asymmetric ultrasonic horn through a set bolt, the two-dimensional ultrasonic vibration transducer is configured to output ultrasonic longitudinal-flexural complex vibration, the asymmetric ultrasonic horn is configured to convert and decompose a longitudinal vibration output by the two-dimensional ultrasonic vibration transducer into a second-phase flexural vibration and a longitudinal vibration, and output a three-dimensional ultrasonic elliptical vibration trajectory on the cutter in combination with a first-phase flexural vibration output by the two-dimensional ultrasonic vibration transducer.

2. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 1, wherein the two-dimensional ultrasonic vibration transducer comprises a preload bolt, a rear cover, a circular piezoelectric ceramic stack, a middle cover, a semi-circular piezoelectric ceramic stack, and a front cover, wherein the rear cover, the circular piezoelectric ceramic stack, the middle cover, the semi-circular piezoelectric ceramic stack, and the front cover are fastened in sequence along an axis direction through the preload bolt.

3. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 2, wherein the circular piezoelectric ceramic stack is disposed at a peak position of longitudinal vibration for energizing a second-order longitudinal vibration mode of the two-dimensional ultrasonic vibration transducer to make the transducer output the longitudinal vibration, the semi-circular piezoelectric ceramic stack is disposed at a wave node position of flexural vibration for energizing a sixth-order flexural vibration mode of the two-dimensional ultrasonic vibration transducer to make the transducer output the first-phase flexural vibration, and the two piezoelectric ceramic stacks are energized by two phase ultrasonic excitation signals with a certain phase difference to make the transducer in a longitudinal-flexural complex vibration mode to output the longitudinal-flexural complex ultrasonic vibration.

4. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 2, wherein the circular piezoelectric ceramic stack, using a d33 working mode with higher working efficiency of piezoelectric ceramic, is composed of a circular piezoelectric ceramic sheet under the model number PZT-4 and an electrode sheet, and the semi-circular piezoelectric ceramic stack, using a d33 working mode with higher working efficiency of piezoelectric ceramic, is composed of a semi-circular piezoelectric ceramic sheet under the model number PZT-4 and an electrode sheet, wherein positive and negative electrodes of the semi-circular piezoelectric ceramic sheet are reversely arranged.

5. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 1, wherein the asymmetric ultrasonic horn is configured to amplify, decompose and convert the longitudinal vibration output by the transducer, converting a part of the longitudinal vibration into a second-phase flexural vibration along a center of an asymmetric structure, while the other part of the longitudinal vibration continues to be transmitted forwards.

6. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 1, wherein by calculating and optimizing a position and a geometric dimension of the asymmetric structure of the asymmetric ultrasonic horn, a ratio of conversion from the longitudinal vibration to the second-phase flexural vibration is adjusted.

7. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 6, wherein a diameter of an input end of the asymmetric ultrasonic horn is smaller than a diameter of the two-dimensional ultrasonic vibration transducer, so as to amplify the ultrasonic vibration output by the transducer for the first time; the asymmetric structure is a stepped structure asymmetrically arranged relative to a rotating body, and is configured to amplify the ultrasonic vibration for the second time.

8. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 7, wherein a center line of the asymmetric structure of the asymmetric ultrasonic horn is parallel to a splice line of the semi-circular piezoelectric ceramic sheet of the two-dimensional ultrasonic vibration transducer, so that the first-phase flexural vibration output by the two-dimensional ultrasonic vibration transducer has no asymmetric structure on a transmission path of the horn, thereby only amplifying the first-phase flexural vibration.

9. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 1, wherein after the longitudinal-flexural complex vibration output by the two-dimensional ultrasonic vibration transducer is amplified, decomposed and converted by the asymmetric ultrasonic horn, a longitudinal-flexural-flexural ultrasonic complex vibration is output on the cutter disposed at a tail end of the horn, and the three-phase ultrasonic vibration has a certain angle and a certain phase difference, so that the three-phase ultrasonic vibration synthesizes a three-dimensional ultrasonic elliptical vibration trajectory.

10. The novel three-dimensional ultrasonic elliptical vibration cutting device according to claim 1, wherein by means of adjusting a voltage and the phase difference of the two-phase excitation signal of the two-dimensional ultrasonic vibration transducer and the asymmetric structure of the asymmetric ultrasonic horn, the three-dimensional ultrasonic elliptical vibration trajectory output by the device is adjusted.

Description

DETAILED DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solution in the embodiment of the present invention or the prior art, the following is a brief introduction of the accompanying drawings required to be used in the description of the embodiment or the prior art. Obviously, the accompanying drawings in the description below are some embodiments of the present invention. For those ordinary in the art, other accompanying drawings can also be obtained from these accompanying drawings without creative labor.

[0024] FIG. 1 is a schematic diagram of a main body structure in a coordinate system according to an embodiment of the present invention.

[0025] FIG. 2 is a schematic diagram of a main body structure according to an embodiment of the present disclosure.

[0026] FIG. 3 is an exploded view of a main structure according to an embodiment of the present invention.

[0027] In the figures: 1. two-dimensional vibration transducer, 2. asymmetric ultrasonic horn, 3. diamond cutter, 4. preload bolt, 5. rear cover, 6. silver electrode sheet of circular piezoelectric ceramic stack, 6A and 6B. silver electrode sheet, 7. circular piezoelectric ceramic stack, 7A and 7B. circular piezoelectric ceramic sheet, 8. middle cover, 9. silver electrode sheet of semi-circular piezoelectric ceramic stack, 9A and 9B. silver electrode sheet, 10. semi-circular piezoelectric ceramic stack, 10A, 10B, 10C and 10D. semi-circular piezoelectric ceramic sheet, 11. front cover, 12. asymmetric structure, 13. set bolt.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all the other embodiments obtained by those of ordinary skill in the art without inventive effort are within the protection scope of the present invention.

[0029] As shown in FIG. 1, a novel three-dimensional ultrasonic elliptical vibration device of the present invention is provided, including a two-dimensional ultrasonic vibration transducer 1, an asymmetric ultrasonic horn 2, and a diamond cutter 3.

[0030] As shown in FIGS. 2 and 3, the two-dimensional ultrasonic vibration transducer 1 includes a preload bolt 4, a rear cover 5, silver electrode sheets 6A and 6B, circular piezoelectric ceramic sheets 7A and 7B, a middle cover 8, silver electrode sheets 9A and 9B, semi-circular piezoelectric ceramic sheets 10A, 10B, 10C and 10D, and a front cover 11.

[0031] As shown in FIG. 2, the two groups of piezoelectric ceramic stacks 7 and 10 of the dimensional ultrasonic vibration transducer 1 are both the Model PZT-4 piezoelectric ceramics, belonging to a sandwich-type ultrasonic transducer, which uses a d33 working mode with higher working efficiency of piezoelectric ceramic.

[0032] As shown in FIG. 3, the positive and negative electrodes of the semi-circular piezoelectric ceramic sheets 10A, 10B, 10C and 10D should be inversely arranged, so as to make the piezoelectric ceramic stacks stretch and expand simultaneously.

[0033] As shown in FIG. 2, the two-dimensional ultrasonic vibration transducer 1 is energized by a two-phase ultrasonic excitation signal with the same frequency and a certain phase difference, so that the two-dimensional ultrasonic vibration transducer 1 presents a longitudinal-flexural complex vibration mode, and outputs ultrasonic longitudinal-flexural complex vibration. By adjusting the voltage and phase difference of the two-phase excitation signal, the complex vibration output by the transducer 1 may be adjusted, thereby changing the shape of the three-dimensional ultrasonic elliptical vibration trajectory output by the device of the present invention.

[0034] As shown in FIG. 2, the asymmetric ultrasonic horn 2 is connected to the two-dimensional ultrasonic vibration transducer 1 through the preload bolt 4. The asymmetric structure 12 converts and decomposes the longitudinal vibration output by the transducer 1 into a second-phase flexural vibration and a longitudinal vibration, and to output a three-dimensional ultrasonic elliptical trajectory on the diamond cutter 3 in combine with a first-phase flexural vibration output by the transducer 1. By design of the position and geometric size of the asymmetric structure 12, the ratio of conversion from the longitudinal vibration to the second-phase flexural vibration may be adjusted, thereby affecting the shape of the three-dimensional ultrasonic elliptical vibration trajectory output by the present invention.

[0035] As shown in FIG. 3, the center line of the asymmetric structure 12 of the asymmetric ultrasonic horn 2 is parallel to the splice line of the semi-circular piezoelectric ceramic sheets 10A, 10B, 10C and 10D of the two-dimensional ultrasonic vibration transducer (along the v direction), so that the first-phase flexural vibration output by the two-dimensional ultrasonic vibration transducer has no asymmetric structure on the transmission path of the horn, thereby only amplifying the first-phase flexural vibration without vibration mode conversion.

[0036] As shown in FIG. 3, before assembly, the asymmetric ultrasonic horn 2, the diamond cutter 3, the preload bolt 4, the rear cover 5, the silver electrode sheets 6A and 6B, the circular piezoelectric ceramic sheets 7A and 7B, the middle cover 8, the silver electrode sheets 9A and 9B, the semi-circular piezoelectric ceramic sheets 10A, 10B, 10C and 10D, the front cover 11, and the set bolt 13 should be washed with absolute ethyl alcohol and dried with an air drying oven. The parts of the preload bolt 4 where contacting the rear cover 5, the silver electrode sheets 6A and 6B, the circular piezoelectric ceramic sheets 7A and 7B, the middle cover 8, the silver electrode sheets 9A and 9B, and the semi-circular piezoelectric ceramic sheets 10A, 10B, 10C and 10D should be wrapped with an insulating tape. The epoxy resin adhesive should be applied between the contact surfaces of the rear cover 5, the silver electrode sheets 6A and 6B, the circular piezoelectric ceramic sheets 7A and 7B, the middle cover 8, the silver electrode sheets 9A and 9B, and the semi-circular piezoelectric ceramic sheets 10A, 10B, 10C, and 10D.

[0037] As shown in FIG. 2, the diamond cutter 3 is fixed at the foremost end of the asymmetric ultrasonic horn 2 through the set bolt 13.

[0038] As shown in FIG. 3, the rear cover 5, the silver electrode sheet 6A, the circular piezoelectric ceramic sheet 7A, the silver electrode sheet 6B, the circular piezoelectric ceramic sheet 7B, the middle cover 8, the silver electrode sheet 9A, the semi-circular piezoelectric ceramic sheets 10A and 10B, the silver electrode sheet 9B, the semi-circular piezoelectric ceramic sheets 10C and 10D, and the front cover 11 are fastened in sequence along the axial direction by the preload bolt 4. In one embodiment, a preload of 120 N is applied, and heat preservation and aging treatment are performed.

[0039] The diameter of the input end of the asymmetric ultrasonic horn 2 is smaller than the diameter of the two-dimensional ultrasonic vibration transducer 1, so as to amplify the ultrasonic vibration output by the transducer 1 for the first time. The asymmetric ultrasonic horn 2 further has a stepped structure, so that the ultrasonic vibration can be amplified for the second time. The three-dimensional ultrasonic elliptical vibration cutting device of the present invention has a multistage amplification function, which can increase the output amplitude, effectively improving the processing efficiency of ultrasonic elliptical vibration cutting.

[0040] At last, it should be noted that the above various embodiments are merely intended to illustrate the technical solution of the present invention and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those ordinary skilled in the art that the technical solutions described in the foregoing embodiments can be modified or equivalents can be substituted for some or all of the technical features thereof; and the modification or substitution does not make the essence of the corresponding technical solution deviate from the scope of the technical solution of each embodiment of the present invention.