CN112791925A - Research method for forming inner cavity of metal liquid drop based on high-energy ultrasonic needle - Google Patents
Research method for forming inner cavity of metal liquid drop based on high-energy ultrasonic needle Download PDFInfo
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- CN112791925A CN112791925A CN202011565558.6A CN202011565558A CN112791925A CN 112791925 A CN112791925 A CN 112791925A CN 202011565558 A CN202011565558 A CN 202011565558A CN 112791925 A CN112791925 A CN 112791925A
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- metal liquid
- liquid drop
- ultrasonic needle
- inner cavity
- energy
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 43
- 239000002184 metal Substances 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011160 research Methods 0.000 title claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 21
- 230000005284 excitation Effects 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 11
- 230000005486 microgravity Effects 0.000 claims abstract description 7
- 239000000919 ceramic Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 4
- 230000010287 polarization Effects 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
- B81C1/00015—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems
- B81C1/00023—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems without movable or flexible elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
- B81C1/00015—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems
- B81C1/00023—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems without movable or flexible elements
- B81C1/00047—Cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
- B81C1/00015—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems
- B81C1/00023—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems without movable or flexible elements
- B81C1/00087—Holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/50—Application to a particular transducer type
- B06B2201/55—Piezoelectric transducer
Abstract
The invention relates to a research method for forming an inner cavity of a metal liquid drop based on the action of a high-energy ultrasonic needle, which comprises the following steps: firstly, a single-shaft ultrasonic suspension device provides a microgravity processing environment for processed metal liquid drops; step two, a sinusoidal signal sent by an ultrasonic generator is used as an excitation voltage of the nonlinear LC circuit; step three, the high-energy ultrasonic needle transducer of the invention is provided with an excitation voltage by a nonlinear LC circuit; fourthly, solitons generated by the excitation of the nonlinear LC circuit and the directivity of the ultrasonic needle jointly act on the inside of the metal liquid drop to induce cavitation nuclei to generate cavitation bubbles, so that the purpose of ultrasonic internal processing is achieved; the invention designs an envelope soliton generated by a nonlinear LC circuit as the excitation voltage of a high-energy ultrasonic needle transducer by combining the characteristic that the soliton carries high energy.
Description
Technical Field
The invention belongs to the technical field of micro-nano machining and manufacturing, and particularly relates to a research method for forming an inner cavity of a metal liquid drop based on a high-energy ultrasonic needle.
Background
With the iterative update of the technology, more and more novel materials are applied to various fields, but many materials are non-metal or metal with low hardness, so that direct processing cannot be performed by using a cutter, and the traditional processing method cannot be well solved, such as biological tissues, liquid metal and the like, so that a novel processing technology is required. The ultrasonic processing can directly process the interior of the part without a cutter, and the interior of the object is processed to form various microstructures through the heat effect formed by sound wave focusing, so that the method becomes a new method for processing the interior of the material. However, ultrasonic internal machining requires high energy focusing of the sound waves to achieve energy concentration for machining the interior of the part.
In recent years, a lot of research on ultrasonic focusing has been conducted by many groups of subjects at home and abroad. At present, the acoustic focusing methods mainly include ultrasonic phased array focusing, temperature regulation and control focusing and the like. However, factors influencing whether the ultrasonic phased array can be focused are more, firstly, whether sound waves can be focused is influenced by the arrangement mode of a plurality of sound sources, and secondly, the position of a focusing point is difficult to regulate and control. Factors influencing temperature regulation and control focusing mainly have the defects of low focusing energy, difficult control of phase regulation, difficult observation and measurement and the like.
In view of the above problems, it is necessary to improve them.
Disclosure of Invention
The invention aims to provide a research method for forming a metal liquid drop inner cavity based on the action of a high-energy ultrasonic needle, aiming at the defects of the prior art.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a research method based on the inner cavity forming of a metal liquid drop acted by a high-energy ultrasonic needle comprises the following steps:
firstly, a single-shaft ultrasonic suspension device provides a microgravity processing environment for processed metal liquid drops;
step two, a sinusoidal signal sent by an ultrasonic generator is used as an excitation voltage of the nonlinear LC circuit;
step three, the high-energy ultrasonic needle transducer of the invention is provided with an excitation voltage by a nonlinear LC circuit;
and step four, solitons generated by the excitation of the nonlinear LC circuit act on the inside of the metal liquid drop together with the directivity of the ultrasonic needle to induce cavitation nuclei to generate cavitation bubbles, so that the purpose of ultrasonic internal processing is achieved.
In a preferred embodiment of the present invention, in the first step, the reflecting surface is a concave spherical surface with a radius of curvature of 37.5.
As a preferred scheme of the invention, in the step one, a stepping motor is adopted to control a lifting platform to move up and down so as to provide a stable suspension resonance distance for suspending metal liquid drops; wherein the resonance distance is 12 mm.
In a preferred embodiment of the present invention, the test process metal is potassium metal.
In a preferred embodiment of the present invention, the ultrasonic frequency of the high-energy ultrasonic needle is selected to be F ═ 110 ± 1.5Khz, the corresponding peak value is amplified to 54vpp, and the power P is 304W.
As a preferred aspect of the present invention, the nonlinear LC circuit may excite the generation of envelope solitons.
In a preferred embodiment of the present invention, the radius of curvature of the reflecting surface is 37.5.
As a preferable scheme of the invention, the high energy carried by the solitons can be directionally transmitted and acted on the interior of the metal liquid drop in the ultrasonic needle.
As a preferable scheme of the invention, the nonlinear LC circuit is connected with a piezoelectric ceramic piece, the piezoelectric ceramic piece is screwed up through a front aluminum block, a rear aluminum block and a bolt, and an ultrasonic needle is welded on the front aluminum block in a direction perpendicular to the polarization direction.
As a preferable mode of the present invention, the resonant frequency F of the piezoelectric ceramic plate is 110 ± 1.5 Khz.
The invention has the beneficial effects that:
1. the ultrasonic wave is selected as a processing cutter, the processing cutter is suitable for various brittle and hard materials, is easy to process holes, cavities and molding surfaces with various complex shapes, and is green and pollution-free;
2. the invention provides a stable non-contact microgravity environment for suspended metal droplets through the adjustable lifting platform.
3. The invention combines the characteristic that solitons carry high energy, and designs an envelope soliton generated by a nonlinear LC circuit as the excitation voltage of a high-energy ultrasonic needle transducer;
4. compared with the existing ultrasonic needle transducer, the high-energy ultrasonic needle transducer can excite high-energy ultrasonic wave focusing by combining the combined action of the solitons;
5. the characteristic that ultrasonic waves have directivity is combined, solitons excited by the high-energy ultrasonic needle directly act on the interior of the metal liquid drop to induce cavitation nuclei to generate cavitation bubbles.
Drawings
FIG. 1 is a schematic diagram of a high-energy ultrasonic needle transducer according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the overall framework of a system for forming the inner cavity of a metal droplet by the action of a high-energy ultrasonic needle in the embodiment of the invention;
FIG. 3 is a schematic diagram of the working principle of the processing of the inner cavity of the high-energy ultrasonic needle in the embodiment of the invention.
Reference numbers in the figures: pre-tightening the bolt 1; a spring washer 2; a rear aluminum block 3; a piezoelectric ceramic piece 4; a front aluminum block 5; an ultrasonic needle 6; a nonlinear LC circuit 7; an ultrasonic generator 8; an amplitude transformer 9; a CCD high-speed camera 10; a suspended metal droplet 11; a concave spherical reflection 12; and an elevating platform 13.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the invention provides a research method for forming an inner cavity of a metal liquid drop based on the action of a high-energy ultrasonic needle, which comprises the following steps:
firstly, a single-shaft ultrasonic suspension device provides a microgravity processing environment for a processed metal liquid drop 11;
secondly, a sinusoidal signal sent by the ultrasonic generator 8 is used as an excitation voltage of the nonlinear LC circuit 7;
step three, the high-energy ultrasonic needle transducer of the invention is provided with an excitation voltage by a nonlinear LC circuit 7;
and step four, solitons generated by excitation of the nonlinear LC circuit 7 and the directivity of the ultrasonic needle jointly act on the interior of the metal liquid drop 11 to induce cavitation nuclei to generate cavitation bubbles, so that the purpose of ultrasonic internal processing is achieved.
The transducer structure of the high-energy ultrasonic needle 6 in the example is shown in figure 1; the external dimensions of the piezoelectric ceramic plate 4 used in this example are: diameter x outer diameter x height 50 x 17 x 6.5, material P8; the resonant frequency is 110 ± 1.5Khz, and the ultrasonic needle can be excited to emit maximum energy in the bending vibration mode by using the resonant frequency in combination with the ultrasonic generation frequency. And secondly, the low voltage is convenient to use, and the safety and the energy utilization rate are improved.
The piezoelectric ceramic piece 4 is placed in the polarization direction, the piezoelectric ceramic piece 4 is screwed up through the front aluminum block 5, the rear aluminum block 3 and the bolt 1, and the ultrasonic needle is welded on the front aluminum block 5 in the direction perpendicular to the polarization direction.
The resonant frequency F of the piezoelectric ceramic plate 4 is 110 ± 1.5Khz, and the external dimension of the piezoelectric ceramic plate 4 is: the diameter x outer diameter x height is 50 x 17 x 6.5.
Example 2
In the embodiment, a microgravity processing environment is provided for the suspended metal droplets 11 by using the uniaxial standing wave ultrasonic suspension device 9; the distance between the emitting surface and the reflecting surface 12 can be adjusted, and the proper ultrasonic emitting frequency is selected, so that a stable suspension, microgravity and non-contact processing environment is provided for the metal liquid drop 11 to be processed. As shown in figure 2 for a single axis suspension.
Wherein, the ultrasonic emission frequency selects 40KHz, and the resonance distance between the emitting surface and the reflecting surface 12 is adjusted to 12mm to reach a stable suspension state. The test processing metal is potassium metal, and has good processing effect.
The ultrasonic wave is selected as a processing cutter, the processing cutter is suitable for various brittle and hard materials, is easy to process holes, cavities and molding surfaces with various complex shapes, and is green and pollution-free;
other contents of this embodiment can be referred to embodiment 1.
Example 3
Firstly, a sinusoidal signal with the frequency of 110KHz is emitted by an ultrasonic generator manufactured by a subject group as the excitation voltage of the nonlinear LC circuit 7, so that the designed nonlinear circuit can excite a high-energy soliton, and then the voltage of the nonlinear LC circuit 7 connected in series is used as the excitation voltage of the piezoelectric ceramic plate 4, so that the excited soliton can be directionally propagated in the ultrasonic needle 6. The specific implementation is shown in fig. 2.
Wherein, a nonlinear LC circuit 7 is used as the excitation voltage of the ultrasonic needle transducer; the soliton can be propagated in the ultrasonic needle without attenuation and directivity.
The invention combines the characteristic that solitons carry high energy, and designs an envelope soliton generated by a nonlinear LC circuit as the excitation voltage of a high-energy ultrasonic needle transducer;
the other contents of this embodiment can be referred to embodiment 1 or embodiment 2.
Example 4
As shown in FIG. 3, after the ultrasonic needle 6 successfully excites the high-energy solitons through the previous embodiment, the position of the cavitation nuclei in the metal droplet is observed through the high-speed camera CCD10, and then the high-energy ultrasonic needle 6 is aligned to the position of the cavitation nuclei in the metal droplet in the stable suspension state. In order to enable the energy excited by the ultrasonic needle transducer to exceed the internal cavitation threshold of the metal liquid drop and induce cavitation nuclei to generate cavitation bubbles, the purpose of internal processing is achieved. The structure is provided with a Y-shaped high-energy ultrasonic needle arrangement mode which jointly acts on cavitation nuclei to induce cavitation bubbles.
Preferably, the Y-shaped high-energy ultrasonic needle is arranged.
For other contents of this embodiment, reference may be made to embodiment 1, embodiment 2, or embodiment 3.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: pre-tightening the bolt 1; a spring washer 2; a rear aluminum block 3; a piezoelectric ceramic piece 4; a front aluminum block 5; an ultrasonic needle 6; a nonlinear LC circuit 7; an ultrasonic generator 8; an amplitude transformer 9; a CCD high-speed camera 10; a suspended metal droplet 11; a concave spherical reflection 12; the elevator table 13, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A research method based on the inner cavity forming of metal liquid drops by a high-energy ultrasonic needle is characterized in that: the method comprises the following steps:
firstly, a single-shaft ultrasonic suspension device provides a microgravity processing environment for processed metal droplets (11);
secondly, a sinusoidal signal sent by the ultrasonic generator (8) is used as an excitation voltage of the nonlinear LC circuit (7);
step three, the high-energy ultrasonic needle transducer of the invention is provided with an excitation voltage by a nonlinear LC circuit (7);
fourthly, the soliton generated by the excitation of the nonlinear LC circuit (7) is combined with the directivity of the ultrasonic needle to jointly act inside the metal liquid drop (11) to induce cavitation nuclei to generate cavitation bubbles.
2. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle action is characterized in that: in the first step, the reflecting surface adopts concave spherical reflection (12), and the curvature radius is 37.5.
3. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle action is characterized in that: in the first step, a stepping motor is adopted to control a lifting platform to move up and down so as to provide a stable suspension resonance distance for suspended metal droplets; wherein the resonance distance is 12 mm.
4. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle action is characterized in that: the test process metal was potassium metal.
5. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle as claimed in claim 4, wherein the research method comprises the following steps: the ultrasonic frequency of the high-energy ultrasonic needle (6) is selected to be F110 +/-1.5 Khz, the corresponding peak-to-peak value is amplified to 54vpp, and the power P is 304W.
6. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle action is characterized in that: the nonlinear LC circuit (7) can excite the generation of envelope solitons.
7. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle action is characterized in that: the radius of curvature of the reflecting surface is 37.5.
8. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle effect according to claim 7, is characterized in that: the high energy carried by the solitons can be directionally transmitted in the ultrasonic needle to act on the interior of the metal liquid drop.
9. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle effect is characterized in that: the nonlinear LC circuit (7) is connected with the piezoelectric ceramic piece (4), the piezoelectric ceramic piece (4) is screwed up through the front aluminum block (5), the rear aluminum block (3) and the bolt (1), and the ultrasonic needle is welded on the front aluminum block (5) in the direction perpendicular to the polarization direction.
10. The research method for the inner cavity forming of the metal liquid drop based on the high-energy ultrasonic needle action is as claimed in claim 9, and is characterized in that: the resonant frequency F of the piezoelectric ceramic piece (4) is 110 +/-1.5 Khz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011565558.6A CN112791925A (en) | 2020-12-25 | 2020-12-25 | Research method for forming inner cavity of metal liquid drop based on high-energy ultrasonic needle |
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| CN202011565558.6A CN112791925A (en) | 2020-12-25 | 2020-12-25 | Research method for forming inner cavity of metal liquid drop based on high-energy ultrasonic needle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113263182A (en) * | 2021-05-20 | 2021-08-17 | 杭州电子科技大学 | Method and equipment for forming fixed-point acoustic cavitation of inner cavity of metal liquid drop |
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2020
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| US20100228122A1 (en) * | 2005-10-27 | 2010-09-09 | Artenga Inc. | Microbubble medical devices |
| CN108161334A (en) * | 2017-10-24 | 2018-06-15 | 杭州电子科技大学 | Method inside laser-ultrasound processing non-transparent material |
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