CN108857037B - Megahertz high-frequency ultrasonic welding device and method thereof - Google Patents
Megahertz high-frequency ultrasonic welding device and method thereof Download PDFInfo
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- CN108857037B CN108857037B CN201810878745.6A CN201810878745A CN108857037B CN 108857037 B CN108857037 B CN 108857037B CN 201810878745 A CN201810878745 A CN 201810878745A CN 108857037 B CN108857037 B CN 108857037B
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- welding
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- frequency ultrasonic
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- 238000003466 welding Methods 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000919 ceramic Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 35
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000004033 plastic Substances 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
- 239000002994 raw material Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
A megahertz level high frequency ultrasonic welding device and a method thereof relate to a welding device and a method thereof, and the device consists of an ultrasonic vibration additional system and a welding fixture; the ultrasonic additional system comprises piezoelectric ceramics, a matching layer, a welding piece and corresponding electric input equipment; the method is characterized in that high-frequency ultrasonic generated by a piezoelectric vibrator is required to act on a welding interface through a double-layer matching layer containing a welding piece, and the matching layer material and thickness stuck on piezoelectric ceramics are adjusted and selected according to the material and thickness change of the welding piece; the high-frequency ultrasonic wave frequency is in the high-frequency ultrasonic domain of hundreds of kilohertz to several megahertz; the piezoelectric ceramic sheet uses high-power radiation and works in its own thickness resonance vibration mode. The invention can realize ultrasonic welding of different materials and different application occasions.
Description
Technical Field
The present invention relates to a welding apparatus and a method thereof, and more particularly, to a megahertz-level high-frequency ultrasonic welding apparatus and a method thereof.
Background
The ultrasonic welding working principle is that ultrasonic energy is transmitted to a welding area through an upper welding piece, and local high temperature can be generated due to the fact that the acoustic resistance of the welding area, namely the interface of two welding areas is large. And because the plastic has poor heat conductivity, the plastic cannot be timely dispersed and gathered in a welding area, so that the contact surfaces of the two plastics are quickly melted, and the two plastics are fused into a whole after a certain pressure is applied. After the ultrasonic wave stops acting, the pressure is kept for a little pressure maintaining time, so that the ultrasonic wave is solidified and formed, a firm molecular chain is formed, the purpose of welding is achieved, the welding strength can be close to the strength of a raw material body, and therefore the ultrasonic welding is widely applied and developed. The key component used in conventional ultrasonic welding techniques is typically a langevin piezoelectric vibrator operating at resonance, typically at a frequency between 20 khz and 60 khz. Because the amplitude needs to be increased through the amplitude transformer, and the shape of a welded part needs to be adapted through the end structure of the vibrator, the key structural parts of the welding device are rod-shaped parts capable of realizing one-dimensional telescopic vibration, so that the equipment is quite large and heavy in structure and cannot be flexibly suitable for certain special occasions.
Under the condition of certain frequency, the higher the amplitude, the larger the ultrasonic action energy is, the traditional ultrasonic vibration welding device depends on the integral modal analysis and design of the vibration elastomer and is limited by the vibrator structure, and the amplitude and the frequency of the ultrasonic vibration welding device are difficult to break through a classical design interval, so that the ultrasonic action energy is limited. Megahertz high frequency ultrasonic vibration is characterized by high frequency and small amplitude, but the overall wave energy can be much greater than that of classical ultrasonic welding vibrators. The piezoelectric vibrator works in a thickness vibration mode, the structural form of the ultrasonic welding device is easy to simplify, and the characteristics of short ultrasonic wavelength, good linearity, strong sound of the piezoelectric vibrator and the like are utilized to realize the rapid welding of thinner plastic parts.
Disclosure of Invention
The invention aims to provide a megahertz-level high-frequency ultrasonic welding device and a method thereof.
The invention aims at realizing the following technical scheme:
a megahertz-level high-frequency ultrasonic welding device, the device comprising an ultrasonic vibration attachment system and a welding jig; the ultrasonic additional system comprises piezoelectric ceramics, a matching layer, a welding piece and corresponding electric input equipment; the ultrasonic welding vibrator is in clearance fit with the welding fixture; the welding device comprises a welding workbench and a loading platform of the welding fixture; the matching layer is megahertz high-frequency ultrasonic welding head and welding jig are in the same place through clearance fit, fixed ultrasonic welding device, the wire is connected to piezoceramics piece through input circuit line through-hole, piezoceramics piece utilizes epoxy to glue and pastes in the matching layer, weldment II arranges in on the weldment I, weldment is placed to the weldment work platform, welding jig utilizes the bolt hole with its fixing in the welding occasion through the bolt.
According to the megahertz-level high-frequency ultrasonic welding device, the adhesive layer adhered to the matching layer is an epoxy resin adhesive layer with acoustic impedance parameters close to those of the matching layer, and the adhesive layer is thin and uniform and has an effect of negligible influence on sound transmission.
The megahertz high-frequency ultrasonic welding method is a megahertz high-frequency ultrasonic welding method of a matching layer structure, and comprises the steps that high-frequency ultrasonic generated by a piezoelectric vibrator is required to act on a welding position through a welded piece, and the material and the thickness of a matching layer adhered to piezoelectric ceramics are adjusted and selected according to the change of the welded material and the thickness; the high-frequency ultrasonic wave frequency is in the high-frequency ultrasonic domain of hundreds of kilohertz to several megahertz; a high-power radiation type piezoelectric ceramic sheet is adopted and works in a thickness resonance vibration mode; according to different ultrasonic action intensity requirements, the matching layer material and thickness are adjusted to enable the matching layer to work under the condition of highest sound transmission efficiency or lower sound transmission;
the welding process comprises the following steps:
firstly, placing a welding part on a welding working platform, then, introducing high-frequency ultrasonic electric signals by using an ultrasonic generator, applying reasonable load on a Shi Zai platform according to the characteristics of the welding part, selecting reasonable welding time according to the parameters of the welding part such as materials, thickness, size and the like, and finishing the whole welding process through pressure maintaining solidification forming.
The invention has the advantages and effects that:
1. the ultrasonic transducer with the matching layer structure has a simple structure, the matching layer separates the resonant piezoelectric ceramic from the welded piece and serves as a welding head, and the simple and flexible addition of high-frequency power ultrasound is realized.
2. The invention can transmit megahertz high-frequency ultrasonic vibration energy to the welding part of the welding piece through the matching layer, and heat is generated between the surface of the welding thermoplastic material and the molecular chain through friction action, so that the heat energy melts the plastic, and the welding part is connected. The high-frequency ultrasonic welding device utilizing the matching layer composite piezoelectric vibrator can be simply attached to a welding fixture, and the welding function is easy to realize, and the operation is flexible and convenient.
3. The megahertz-level high-frequency ultrasonic welding device and the megahertz-level high-frequency ultrasonic welding method can be flexibly applicable to certain special occasions, and the megahertz-level high-frequency ultrasonic welding device has a simple structure and low cost.
Drawings
FIG. 1 is a schematic diagram of a megahertz-level high-frequency ultrasonic welding vibrator of the present invention;
FIG. 2 is a schematic top view of a megahertz-level high frequency ultrasonic welding vibrator of the present invention;
fig. 3 is an overall schematic view of the high frequency ultrasonic welding jig device of the present invention.
The reference numerals in the figures are: 1. piezoelectric ceramics; 2. a wire; 3. a matching layer; 4. a welding piece I; 5. a welding part II; 6. welding a clamp; 7. bolt holes; 8. a welding working platform; 9. an input circuit via; 10. and (5) a loading platform.
Detailed Description
The present invention will be described in detail with reference to examples.
The device consists of an ultrasonic vibration additional system and a welding fixture; the ultrasonic additional system comprises piezoelectric ceramics, a matching layer, a welding piece and corresponding electric input equipment; the ultrasonic welding vibrator is in clearance fit with the welding fixture, the welding part is summarized as a welding workbench, a loading platform and an ultrasonic additional system of the welding fixture, and the ultrasonic welding fixture is provided with an additional equipment loading platform for realizing pressure maintaining of a welding part to enable the welding part to be solidified and molded. The matching layer 3 is used as a megahertz-level high-frequency ultrasonic welding head and is matched with the welding fixture 6 through a clearance for fixing an ultrasonic welding device, the lead 2 is connected to the piezoelectric ceramic plate 1 through the input circuit wire through hole 9, the piezoelectric ceramic plate 1 is adhered to the matching layer 2 by using epoxy resin glue, the welding part II is arranged on the welding part I, the welding work platform is used for placing the welding part, and the welding fixture 6 is fixed on a welding occasion by using bolts through the bolt holes 7. The adhesive layer is made of epoxy resin with acoustic impedance parameters close to those of the matching layer, and the adhesive layer is thin and uniform and has an effect of neglecting influence on sound transmission.
The welding method comprises the steps that high-frequency ultrasound generated by a piezoelectric vibrator ultrasonic source is required to act on a welding interface, namely, a welding interface of two welding layers through a double-layer matching layer containing a welding piece, and the material and the thickness of the matching layer adhered to piezoelectric ceramics are adjusted and selected according to the welded material and the thickness change; the high-frequency ultrasonic wave frequency is in the high-frequency ultrasonic domain of hundreds of kilohertz to several megahertz; a high-power radiation type piezoelectric ceramic sheet is adopted and works in a thickness resonance vibration mode; according to different ultrasonic action intensity requirements, the matching layer material and thickness are adjusted to enable the matching layer to work under the condition of highest sound transmission efficiency or lower sound transmission. In the megahertz-level high-frequency ultrasonic welding method, the adhesive layer is an epoxy resin adhesive layer with acoustic impedance parameters close to those of the matching layer, and the adhesive layer is thin and uniform and has the effect of neglecting influence on sound transmission.
The welding process of the invention comprises the following steps:
firstly, placing a welding part on a welding working platform, then, introducing high-frequency ultrasonic electric signals by using an ultrasonic generator, applying reasonable load on a Shi Zai platform according to the characteristics of the welding part, selecting reasonable welding time according to the parameters of the welding part such as materials, thickness, size and the like, and finishing the whole welding process through pressure maintaining solidification forming.
The welding raw material is plastic such as PVC with the thickness of about 1 mm; the matching layer with the diameter of 10mm is adopted as a megahertz-level high-frequency ultrasonic welding head, the welding power is about 30w, different loads of 20N, 35N, 45N and 65N are sequentially applied on a loading platform, and the optimal welding effect time for welding plastic thin plates such as PVC and the like with the thickness of about 1mm is about 30s, 20s, 15s and 10s respectively.
Claims (2)
1. A megahertz-level high-frequency ultrasonic welding device, which is characterized by comprising an ultrasonic vibration additional system and a welding fixture; the ultrasonic additional system comprises piezoelectric ceramics, a matching layer, a welding piece and corresponding electric input equipment; the ultrasonic welding vibrator is in clearance fit with the welding fixture; the welding device comprises a welding workbench and a loading platform of the welding fixture; the matching layer (3) is formed by matching a megahertz high-frequency ultrasonic welding head with a welding fixture (6) through a clearance, an ultrasonic welding device is fixed, a lead (2) is connected to a piezoelectric ceramic piece (1) through an input circuit line through hole (9), the piezoelectric ceramic piece (1) is adhered to the matching layer (2) through epoxy resin glue, a welding piece II is arranged on the welding piece I, a welding work platform is used for placing the welding piece, and the welding fixture (6) is fixed on a welding occasion through a bolt hole (7) through a bolt;
the adhesive layer adhered to the matching layer (2) is an epoxy resin adhesive layer with acoustic impedance parameters close to those of the matching layer, and the adhesive layer is thin and uniform and has an effect of neglecting influence on sound transmission.
2. The welding method of a megasonic welding apparatus according to claim 1, wherein the high-frequency ultrasonic welding method is a megasonic welding method of a matching layer structure, comprising the steps of applying high-frequency ultrasonic generated by a piezoelectric vibrator to a welding place through a welded piece, and adjusting and selecting a material and a thickness of the matching layer adhered to the piezoelectric ceramic according to the material and thickness variation to be welded; the high-frequency ultrasonic wave frequency is in the high-frequency ultrasonic domain of hundreds of kilohertz to several megahertz; a high-power radiation type piezoelectric ceramic sheet is adopted and works in a thickness resonance vibration mode; according to different ultrasonic action intensity requirements, the matching layer material and thickness are adjusted to enable the matching layer to work under the condition of highest sound transmission efficiency or lower sound transmission;
the welding process comprises the following steps:
firstly, placing a welding part on a welding working platform, then, introducing high-frequency ultrasonic electric signals by using an ultrasonic generator, applying reasonable load on a Shi Zai platform according to the characteristics of the welding part, selecting reasonable welding time according to the parameters of the welding part such as materials, thickness, size and the like, and finishing the whole welding process through pressure maintaining solidification forming.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810878745.6A CN108857037B (en) | 2018-08-03 | 2018-08-03 | Megahertz high-frequency ultrasonic welding device and method thereof |
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| CN201810878745.6A CN108857037B (en) | 2018-08-03 | 2018-08-03 | Megahertz high-frequency ultrasonic welding device and method thereof |
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| CN108857037A CN108857037A (en) | 2018-11-23 |
| CN108857037B true CN108857037B (en) | 2024-01-26 |
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| CN115570291A (en) * | 2022-09-09 | 2023-01-06 | 湖北鑫鼎泰自动化科技有限公司 | Micro-distance high-frequency vibration collision welding method |
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| CN108857037A (en) | 2018-11-23 |
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