CN110369248B - Variable-angle two-dimensional ultrasonic vibration auxiliary machining platform based on flexible hinge - Google Patents
Variable-angle two-dimensional ultrasonic vibration auxiliary machining platform based on flexible hinge Download PDFInfo
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- CN110369248B CN110369248B CN201910641557.6A CN201910641557A CN110369248B CN 110369248 B CN110369248 B CN 110369248B CN 201910641557 A CN201910641557 A CN 201910641557A CN 110369248 B CN110369248 B CN 110369248B
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- 238000003754 machining Methods 0.000 title claims description 22
- 239000000919 ceramic Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 235000013871 bee wax Nutrition 0.000 claims description 3
- 239000012166 beeswax Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 239000004744 fabric Substances 0.000 abstract 1
- 238000003801 milling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
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Classifications
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- 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
- B06B1/0607—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 using multiple elements
- B06B1/0622—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 using multiple elements on one surface
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The utility model provides a become angle two-dimentional ultrasonic vibration auxiliary processing platform based on flexible hinge, includes bottom plate and vibrating mass, the annular platform that the bottom plate set up through its upper surface cooperates with thrust bearing's seat circle, the vibrating mass cooperates with thrust bearing's ring of boss through its lower surface setting, the upper surface of bottom plate is provided with a plurality of flange seats along circumference, installs first supersound oscillator and second supersound oscillator on two of them flange seats respectively, and the change width of cloth pole on first supersound oscillator and the second supersound oscillator closely laminates with the vibrating mass respectively, the bottom plate upper surface is provided with the mount pad, and first flexible hinge is installed to the U-shaped inslot of mount pad, and first flexible hinge closely laminates with the vibrating mass. The two-dimensional ultrasonic vibration processing of the workpiece is realized through the first ultrasonic vibrator and the second ultrasonic vibrator, and the transformation of the main shaft is avoided. A thrust bearing is arranged between the bottom plate and the vibrating block, so that the Z-direction support of the vibrating block is realized, and the vibration of the vibrating block in an XY plane is not influenced.
Description
Technical Field
The invention belongs to the technical field of ultrasonic machining, and particularly relates to a variable-angle two-dimensional ultrasonic vibration auxiliary machining platform based on a flexible hinge.
Background
Since the beginning of the 50 th 20 th century, ultrasonic vibration-assisted machining began to be gradually applied to the industrial field, and attracted great attention and interest of many scholars, and the ultrasonic vibration-assisted machining technology developed rapidly. In recent years, ultrasonic-assisted machining has been a major factor in machining of brittle and hard materials such as engineering ceramics and difficult-to-machine materials such as titanium alloys. The ultrasonic vibration assisted machining technology has proved to have clear advantages in the aspects of reducing cutting force, reducing cutting heat, improving the quality of a machined surface, reducing cutter abrasion, improving machining precision and the like compared with the traditional machining technology.
Ultrasonic vibration assisted milling is used as a branch of ultrasonic vibration assisted machining, and research of the ultrasonic vibration assisted milling is slow to develop later. The mode of transforming the main shaft is adopted to realize most of the milling processing in the assistance of ultrasonic vibration, the transformation cost is high, the difficulty is high, meanwhile, the ultrasonic vibration mode of transforming the main shaft can only drive a small cutter or a grinding head, and the processing requirement is hardly met in actual processing, so that the method is a feasible idea from the angle of workpiece vibration. On the other hand, the research of one-dimensional ultrasonic vibration has made great progress, two-dimensional and even three-dimensional ultrasonic vibration becomes a research hotspot, if the two-dimensional vibration is realized by adopting a mode of modifying a main shaft, only longitudinal bending composite vibration or longitudinal torsion composite vibration can be adopted, the design and research process is very complex, and only two-dimensional vibration at a fixed angle can be realized.
Disclosure of Invention
In order to achieve the purpose, the invention provides a variable-angle two-dimensional ultrasonic vibration auxiliary processing platform based on a flexible hinge, which comprises a bottom plate and a vibrating block, wherein the bottom plate is matched with a seat ring of a thrust bearing through an annular table arranged on the upper surface of the bottom plate, the vibrating block is matched with a shaft ring of the thrust bearing through a round boss arranged on the lower surface of the vibrating block, a plurality of flange seats are arranged on the upper surface of the bottom plate along the circumferential direction, a first ultrasonic vibrator and a second ultrasonic vibrator are respectively arranged on two flange seats, amplitude-changing rods on the first ultrasonic vibrator and the second ultrasonic vibrator are respectively tightly attached to the vibrating block, an installation seat is arranged on the upper surface of the bottom plate, a first flexible hinge is arranged in a U-shaped groove of the installation seat, and the first flexible hinge is tightly attached to the vibrating.
The inner surface of the mounting seat is an arc surface, a plurality of U-shaped grooves are uniformly formed in the inner surface of the mounting seat along the circumferential direction, and the circle center of a circle where the U-shaped grooves are located and the circle center of the vibrating block are the same circle center.
The vibrating block is a diameter-variable circular truncated cone, a plurality of second flexible hinges are uniformly distributed at the large-diameter end of the vibrating block along the circumferential direction, and a part of the second flexible hinges and the first flexible hinges are tightly attached to form a composite flexible hinge structure.
The large-diameter end of the vibrating block is circular or a regular polygon with the number of sides corresponding to the number of the second flexible hinges.
The first ultrasonic vibrator and the second ultrasonic vibrator are identical in structure and respectively comprise an ultrasonic transducer and an amplitude transformer, the ultrasonic transducer comprises a transducer shell, a rear cover, piezoelectric ceramics, a copper electrode plate, a front cover and a fastening bolt are sequentially arranged in the inner cavity of the transducer shell, the fastening bolt sequentially penetrates through the rear cover, the piezoelectric ceramics, the copper electrode plate and the front cover and is fixedly connected with the amplitude transformer, and a spring washer is arranged between the fastening bolt and the rear cover.
The ultrasonic transducer adopts a sandwich type ultrasonic transducer, and the amplitude transformer adopts a conical transition step amplitude transformer.
Beeswax is smeared on the contact surface of the amplitude transformer and the second flexible hinge on the vibrating block to serve as a transmission medium.
The invention has the beneficial effects that:
1. the two-dimensional ultrasonic vibration processing of the workpiece is realized through the first ultrasonic vibrator and the second ultrasonic vibrator, and the transformation of the main shaft is avoided.
2. A thrust bearing is arranged between the bottom plate and the vibrating block, so that the Z-direction support of the vibrating block is realized, and the vibration of the vibrating block in an XY plane is not influenced.
3. The two-dimensional vibration coupling of the vibrating block is realized through the first flexible hinge structure, and the ultrasonic vibration which is more in line with the theoretical design can be generated on the vibrating block.
4. Through the composite flexible hinge structure formed by the first flexible hinge and the second flexible hinge, the vibrating block can still ensure the reciprocating characteristic of vibration under the condition that the double-end stud is not used for connecting the ultrasonic vibrator and the vibrating block.
5. Different installation included angles between the two ultrasonic vibrators are realized through the flange seats and the flexible hinge structures which are distributed at equal angles, more different elliptical motion tracks can be coupled according to processing requirements, processing with higher precision and efficiency is realized, and the platform can be used for ultrasonic auxiliary processing of milling, grinding and drilling.
Drawings
FIG. 1 is a schematic view of a three-dimensional structure of a variable-angle two-dimensional ultrasonic vibration auxiliary processing platform based on a flexible hinge according to the invention;
FIG. 2 is a top view of a flexible hinge based variable angle two-dimensional ultrasonic vibration assisted machining platform of the present invention;
FIG. 3 is a cross-sectional view A-A of the variable angle two-dimensional ultrasonic vibration assisted machining platform based on a flexible hinge of FIG. 2;
FIG. 4 is a schematic structural diagram of an ultrasonic vibrator of a variable-angle two-dimensional ultrasonic vibration auxiliary processing platform based on a flexible hinge;
the vibration damping device comprises a base plate 1, a mounting seat 2, a vibrating block 3, a first flexible hinge 4, a first ultrasonic vibrator 5, an amplitude transformer 6, a flange seat 7, a second flexible hinge 8, a fixing screw 9, a second ultrasonic vibrator 10, a thrust bearing 11, a transducer shell 12, a fastening bolt 13, a spring washer 14, a rear cover 15, piezoelectric ceramics 16, a copper electrode plate 17 and a front cover 18.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, an angle-variable two-dimensional ultrasonic vibration auxiliary processing platform based on a flexible hinge comprises a rectangular bottom plate 1 and a vibrating block 3, wherein the bottom plate 1 is matched with a race of a thrust bearing 11 through an annular table arranged on the upper surface of the bottom plate, the vibrating block 3 is matched with a shaft ring of the thrust bearing 11 through a circular boss arranged on the lower surface of the vibrating block, so that the Z-direction support of the vibrating block 3 is realized, meanwhile, the axial displacement is not limited by a reasoning bearing, so that two-dimensional ultrasonic vibration can be realized, four flange seats 7 are arranged on the upper surface of the bottom plate 1 along the circumferential direction, a first ultrasonic vibrator 5 and a second ultrasonic vibrator 10 are respectively arranged on the two flange seats 7 through fixing screws 9, the first ultrasonic vibrator 5 is a fixed ultrasonic vibrator, the second ultrasonic vibrator 10 is an angle-variable ultrasonic vibrator, amplitude-variable rods 6 on the first ultrasonic vibrator 5 and the second ultrasonic vibrator 10 are respectively tightly attached to the vibrating block 3, the upper surface of the bottom plate 1 is provided with a mounting seat 2, a first flexible hinge 4 is installed in a U-shaped groove of the mounting seat 2, the first flexible hinge 4 is tightly attached to the vibrating block 3, and the first ultrasonic vibrator 5 and the second ultrasonic vibrator 10 are installed on a flange seat 7 which is not used for angle setting, so that variable-angle two-dimensional ultrasonic vibration is realized.
The inner surface of the mounting seat 2 is an arc surface, four U-shaped grooves are uniformly formed in the inner surface of the mounting seat 2 along the circumferential direction, and the circle center of a circle where the four U-shaped grooves are located and the circle center of the vibrating block 3 are the same circle center.
The vibrating block 3 is a diameter-variable circular truncated cone, eight second flexible hinges 8 are uniformly distributed at the large-diameter end of the vibrating block 3 along the circumferential direction, the included angle between every two adjacent second flexible hinges 8 is 45 degrees, wherein the four second flexible hinges 8 are respectively and tightly attached to the four first flexible hinges 4 to form a composite flexible hinge structure, the structure can ensure that the reciprocating motion characteristic of vibration is realized under the condition that the amplitude transformer 6 is not connected with the vibrating block 3 through bolts, and meanwhile, the symmetry of the vibrating block 3 is also ensured; the other four second flexible hinges 8 are respectively arranged corresponding to the four flange seats 7 one by one, when the first ultrasonic transducer 5 is fixed, the second ultrasonic transducers 10 are respectively arranged in three different flange seat 7 holes, so that the arrangement of different included angles of 45 degrees, 90 degrees or 135 degrees between the two ultrasonic vibrators can be realized, and further, elliptic curves with more shapes meeting the processing requirements can be realized.
The large-diameter end of the vibrating block 3 is circular or a regular polygon with the number of sides corresponding to the number of the second flexible hinges 8.
The first ultrasonic vibrator 5 and the second ultrasonic vibrator 10 have the same structure and respectively comprise an ultrasonic transducer and an amplitude transformer 6, the ultrasonic transducer comprises a transducer shell 12, a rear cover 15, piezoelectric ceramics 16, a copper electrode plate 17, a front cover 18 and a fastening bolt 13 are sequentially arranged in an inner cavity of the transducer shell 12, the fastening bolt 13 sequentially penetrates through the rear cover 15, the piezoelectric ceramics 16, the copper electrode plate 17 and the front cover 18 and then is fixedly connected with the amplitude transformer 6, and a spring washer 14 is arranged between the fastening bolt 13 and the rear cover 15.
The ultrasonic transducer adopts a sandwich type ultrasonic transducer, and the amplitude transformer 6 adopts a conical transition step amplitude transformer.
Beeswax is coated on the contact surface of the amplitude transformer 6 and the second flexible hinge 8 on the vibrating block 3 to serve as a transmission medium.
The use process of the variable-angle two-dimensional ultrasonic vibration auxiliary processing platform based on the flexible hinge comprises the following steps:
before machining, the base plate 1 is directly fixed on a workbench of a machine tool through bolts, and a workpiece to be machined is clamped on the upper surface of the vibrating block 3. Firstly, two ultrasonic transducers are connected with an ultrasonic generator (not shown) through a lead, and the first ultrasonic vibrator 5 and the second ultrasonic vibrator 10 are provided with excitation signals with adjustable phase difference by the same ultrasonic generator; and starting the ultrasonic generator, converting an ultrasonic signal into ultrasonic vibration by the ultrasonic generator through the ultrasonic transducer, amplifying the amplitude of the ultrasonic vibration through the amplitude transformer 6 and transmitting the amplitude to the vibrating block 3, and driving the workpiece to perform ultrasonic vibration by the vibrating block 3 under the excitation of the first ultrasonic vibrator 5 and the second ultrasonic vibrator 10. The two-dimensional elliptical ultrasonic vibration meeting the machining requirements of the vibrating block 3 and the workpiece is carried out by adjusting the signal size and the phase difference of the ultrasonic generator, the main shaft of the machine tool is started at the moment, the workpiece arranged on the vibrating table is milled or ground, and the two-dimensional ultrasonic vibration auxiliary machining can be realized.
Claims (6)
1. A variable-angle two-dimensional ultrasonic vibration auxiliary processing platform based on a flexible hinge is characterized by comprising a bottom plate and a vibrating block, wherein the bottom plate is matched with a seat ring of a thrust bearing through an annular table arranged on the upper surface of the bottom plate, the vibrating block is matched with a shaft ring of the thrust bearing through a circular boss arranged on the lower surface of the vibrating block, a plurality of flange seats are arranged on the upper surface of the bottom plate along the circumferential direction, a first ultrasonic vibrator and a second ultrasonic vibrator are respectively arranged on two of the flange seats, amplitude-changing rods on the first ultrasonic vibrator and the second ultrasonic vibrator are respectively tightly attached to the vibrating block, an installation seat is arranged on the upper surface of the bottom plate, a first flexible hinge is arranged in a U-shaped groove of the installation seat, and the first flexible hinge is tightly attached to the vibrating block; the vibrating block is a diameter-variable circular truncated cone, a plurality of second flexible hinges are uniformly distributed at the large-diameter end of the vibrating block along the circumferential direction, and a part of the second flexible hinges and the first flexible hinges are tightly attached to form a composite flexible hinge structure.
2. The flexible hinge-based variable-angle two-dimensional ultrasonic vibration-assisted machining platform according to claim 1, characterized in that: the inner surface of the mounting seat is an arc surface, a plurality of U-shaped grooves are uniformly formed in the inner surface of the mounting seat along the circumferential direction, and the circle center of a circle where the U-shaped grooves are located and the circle center of the vibrating block are the same circle center.
3. The flexible hinge-based variable-angle two-dimensional ultrasonic vibration-assisted machining platform according to claim 1, characterized in that: the large-diameter end of the vibrating block is circular or a regular polygon with the number of sides corresponding to the number of the second flexible hinges.
4. The flexible hinge-based variable-angle two-dimensional ultrasonic vibration-assisted machining platform according to claim 1, characterized in that: the first ultrasonic vibrator and the second ultrasonic vibrator are identical in structure and respectively comprise an ultrasonic transducer and an amplitude transformer, the ultrasonic transducer comprises a transducer shell, a rear cover, piezoelectric ceramics, a copper electrode plate, a front cover and a fastening bolt are sequentially arranged in the inner cavity of the transducer shell, the fastening bolt sequentially penetrates through the rear cover, the piezoelectric ceramics, the copper electrode plate and the front cover and is fixedly connected with the amplitude transformer, and a spring washer is arranged between the fastening bolt and the rear cover.
5. The flexible hinge-based variable-angle two-dimensional ultrasonic vibration-assisted machining platform of claim 4, wherein: the ultrasonic transducer adopts a sandwich type ultrasonic transducer, and the amplitude transformer adopts a conical transition step amplitude transformer.
6. The flexible hinge-based variable-angle two-dimensional ultrasonic vibration-assisted machining platform of claim 4, wherein: beeswax is smeared on the contact surface of the amplitude transformer and the second flexible hinge on the vibrating block to serve as a transmission medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910641557.6A CN110369248B (en) | 2019-07-16 | 2019-07-16 | Variable-angle two-dimensional ultrasonic vibration auxiliary machining platform based on flexible hinge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910641557.6A CN110369248B (en) | 2019-07-16 | 2019-07-16 | Variable-angle two-dimensional ultrasonic vibration auxiliary machining platform based on flexible hinge |
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| CN110369248A CN110369248A (en) | 2019-10-25 |
| CN110369248B true CN110369248B (en) | 2020-05-05 |
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| CN201910641557.6A Active CN110369248B (en) | 2019-07-16 | 2019-07-16 | Variable-angle two-dimensional ultrasonic vibration auxiliary machining platform based on flexible hinge |
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| CN111537174B (en) * | 2020-04-29 | 2021-11-23 | 江苏大学 | Variable-angle ultrasonic impact test device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004351605A (en) * | 2003-05-27 | 2004-12-16 | Kazumasa Onishi | Ultrasonic vibrating table |
| CN104624463B (en) * | 2015-01-09 | 2017-01-25 | 天津大学 | Two-dimensional ultrasound vibration platform |
| CN105880140B (en) * | 2016-03-31 | 2018-07-27 | 天津大学 | A kind of two dimensional ultrasonic vibration platform based on flexible hinge structure |
| CN108561700B (en) * | 2018-06-08 | 2020-03-06 | 天津大学 | Three-degree-of-freedom ultrasonic vibration auxiliary machining precision positioning platform |
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