Ultrasonic-assisted, step-by-step pressure-regulating clamping device and heterogeneous material connection method

Abstract

The present invention discloses an ultrasonic-assisted, step-by-step pressure-adjusting clamping device and a method for connecting heterogeneous materials, comprising: a clamping mechanism, the clamping mechanism comprising a first clamping piece, a second clamping piece, a frame and a power component, the power component is used to drive the first clamping piece and the second clamping piece to approach or move away from each other; a control component, the control component comprising a control component and a temperature collection component, the temperature collection component is used to collect the temperature of the components to be connected in a laser avoidance area, the control component is used to adjust the magnitude of the output force of the power component according to a preset temperature threshold value based on the temperature obtained by the temperature collection component, so that the components of heterogeneous materials connected between the first clamping piece and the second clamping piece can fit each other at least under two different preset pressures; an ultrasonic-assisted component, the ultrasonic-assisted component comprising an ultrasonic sounder and an ultrasonic vibration mechanism, the ultrasonic vibration mechanism is arranged on the outside of the second clamping piece and corresponds to the position of the ultrasonic avoidance area.

Description

Technical Field

[0001] The invention relates to an ultrasonically assisted, step-by-step pressure-regulating clamping device and a method for connecting dissimilar materials. Background Art

[0002] The laminated structure composed of high-performance thermoplastic composite materials and lightweight metal alloys (hereinafter referred to as thermoplastic composites and metals) can take into account excellent properties such as low density and high strength, and has been widely used in high-end aerospace equipment components. Laminated structures need to be connected when they are used. The existing connection methods are mainly screwing and riveting, which will destroy the integrity of the fibers in the composite and reduce the structural strength. Laser connection technology has the advantages of non-contact and heat concentration, and can achieve non-destructive connection of laminated structures. Therefore, laser connection technology is expected to become the preferred technology for connecting laminated structures.

[0003] Laser connection of thermoplastic composites and metals utilizes laser beams to irradiate the metal surface, and uses the high thermal conductivity of the metal to conduct heat to the composite surface and melt it. Under the action of clamping pressure, the composite and the metal surface are in close contact, and after cooling, mechanical anchoring and chemical bonding are generated to achieve connection. Therefore, clamping pressure has a significant effect on the connection strength.

[0004] In the prior art, if the pressure is too low, a gap will be generated between the thermoplastic composite and the metal at the connection, affecting the heat transfer effect and causing insufficient melting of the resin, which will also weaken the mechanical anchoring effect and reduce the connection strength; if the pressure is too high, too much molten resin matrix will be squeezed out, affecting the chemical bonding effect and reducing the connection strength, and will also affect the morphology of the finished product; at the same time, the resin matrix is ​​sensitive to heat and is prone to overheating and decomposition during the connection process to produce bubble defects, which will reduce the connection strength. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art and to provide an ultrasonically assisted, step-by-step pressure-adjusting clamping device and a method for connecting dissimilar materials.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] An ultrasonic-assisted, step-by-step voltage-adjusting clamping device, used for clamping dissimilar materials and connecting them by ultrasonic-assisted laser, comprising: a clamping mechanism, the clamping mechanism comprising a first clamping member, a second clamping member, a frame and a power component, a travel space for clamping dissimilar materials is formed between the first clamping member and the second clamping member, the power component is used to drive the first clamping member and the second clamping member to approach or move away from each other, the first clamping member is provided with a laser avoidance area, the second clamping member is provided with an ultrasonic avoidance area, the frame is used to install the clamping mechanism; a control component, the control component comprises a control component and a temperature collection component, the temperature collection component is used to collect the temperature of the parts to be connected in the laser avoidance area; the control component A controller and a storage unit are provided, the storage unit stores at least two temperature thresholds and pressure output matching values ​​corresponding to the temperature thresholds, the controller controls the connection between the clamping mechanism and the temperature acquisition component, and when the temperature acquired by the temperature acquisition component reaches any of the temperature thresholds, the controller adjusts the output force of the power component to the pressure output matching value, so that the dissimilar materials connected between the first clamping member and the second clamping member can fit each other under at least two different preset pressures to form a laminated structure; an ultrasonic auxiliary component, the ultrasonic auxiliary component includes an ultrasonic sounder and an ultrasonic vibration mechanism, and the ultrasonic vibration mechanism is arranged on the outside of the second clamping member corresponding to the position of the ultrasonic avoidance area.

[0008] Preferably, the power component includes a cylinder, and the control component includes a first air pressure adjusting component, a second air pressure adjusting component, a first solenoid valve and a second solenoid valve, the input end of the first solenoid valve is connected to the first air pressure adjusting component and the second air pressure adjusting component, the output end of the first solenoid valve is connected to the input end of the second solenoid valve, the first solenoid valve is used to switch the first air pressure adjusting component and the second air pressure adjusting component to change the air pressure connected to the input end of the second solenoid valve, and the second solenoid valve is used to switch the movement state of the piston rod of the cylinder.

[0009] Preferably, the control component includes a pressure regulating filter for connecting to an air source, a pressure regulating valve connected to the output end of the pressure regulating filter, a two-position three-way solenoid valve and a two-position five-way solenoid valve, the pressure regulating filter serves as the first air pressure adjusting component, the pressure regulating valve serves as the second air pressure adjusting component, the two-position three-way solenoid valve serves as the first solenoid valve, and the two-position five-way solenoid valve serves as the second solenoid valve.

[0010] Preferably, it is characterized in that the control component includes a temperature controller and a table program controller.

[0011] Preferably, the ultrasonic vibration mechanism includes an ultrasonic horn, an ultrasonic transducer and an ultrasonic base, the ultrasonic transducer is mounted on the ultrasonic base, the horn is mounted on an end of the ultrasonic transducer away from the ultrasonic base, the ultrasonic base is movably connected to the frame and can adjust its position based on the frame to change the distance between the ultrasonic horn and the first clamping member.

[0012] Preferably, the ultrasonic horn is connected to the ultrasonic transducer by threads, and a rubber ring and a rubber ring fixing component are provided at the connection between the two. The rubber ring fixing component includes two tube clamps, and the tube clamps are fastened to the outer periphery of the ultrasonic transducer by bolts and fix the rubber ring to the connection between the ultrasonic horn and the ultrasonic transducer.

[0013] Preferably, the ultrasonic base includes a threaded seat, an expansion sleeve and a rubber sleeve, the expansion sleeve is arranged in an expansion mounting groove provided in the threaded seat, the rubber sleeve is arranged in the inner ring of the expansion sleeve, the end of the transducer connected to the ultrasonic base is inserted into the inner ring of the rubber sleeve, and the transducer is connected to the threaded seat through the expansion sleeve, the frame includes a bottom plate, and the threaded seat is connected to the bottom plate through threads.

[0014] Preferably, the frame includes a base plate and a plurality of supporting components installed on the base plate, the upper end of the supporting component is used to support the first clamping member, the first clamping member is detachably connected to the supporting component, the lower end of the supporting component is provided with a slide groove with a side opening, the second clamping member can be inserted into the slide groove from the side and approach or move away from the first clamping member in the slide groove under the drive of the power component.

[0015] Preferably, the power component includes a cylinder and a cylinder mounting block, the cylinder mounting block is detachably mounted on the support component and can adjust the distance from the first clamping member based on the support component, the support component includes a support rod, the lower end of the support rod is connected to the base plate, the upper end of the support rod is provided with a shoulder and a locking thread portion for supporting the first clamping member, and the first clamping member is provided with a locking hole matching the locking thread portion.

[0016] The method for connecting dissimilar materials comprises the following steps:

[0017] Step 1: using an ultrasonic-assisted, step-by-step pressure-adjusting clamping device as described above to clamp the components of dissimilar materials to be connected, the components of dissimilar materials include metal components and thermoplastic composite components, and driving the power component through the control component so that the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component are fitted at a first pressure value, the other side of the metal component abuts against the first clamping piece, and the side of the thermoplastic composite component away from the metal component abuts against the second clamping piece;

[0018] Step 2, matching the laser welding device to heat the metal component, and the ultrasonic auxiliary component applies ultrasonic vibration to the component of the heterogeneous material;

[0019] Step 3: When the temperature acquisition component obtains the first temperature value, the control component adjusts the output force of the power component so that the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component are fitted at a second pressure value;

[0020] Step 4: Keep the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component in contact with each other at a second pressure value until laser welding is completed, and control the power component to move the second clamping member away from the first clamping member so as to remove the connected components.

[0021] The beneficial effects of the present invention are to provide an ultrasonic-assisted, step-by-step pressure-adjusting clamping device for clamping dissimilar materials and connecting them by ultrasonic-assisted laser, comprising: a clamping mechanism, the clamping mechanism comprising a first clamping member, a second clamping member, a frame and a power component, a travel space for clamping dissimilar materials is formed between the first clamping member and the second clamping member, the power component is used to drive the first clamping member and the second clamping member to approach or move away from each other, the first clamping member is provided with a laser avoidance area, the second clamping member is provided with an ultrasonic avoidance area, and the frame is used to install the clamping mechanism; a control component, the control component comprises a control component and a temperature collection component, the temperature collection component is used to collect the temperature of the to-be-connected component in the laser avoidance area; The control component is provided with a controller and a storage unit, the storage unit stores at least two temperature thresholds and pressure output matching values ​​corresponding to the temperature thresholds, the controller controls the connection between the clamping mechanism and the temperature acquisition component, and when the temperature acquired by the temperature acquisition component reaches any of the temperature thresholds, the controller adjusts the output force of the power component to the pressure output matching value, so that the heterogeneous materials connected between the first clamping member and the second clamping member can fit each other under at least two different preset pressures to form a laminated structure; an ultrasonic auxiliary component, the ultrasonic auxiliary component includes an ultrasonic sounder and an ultrasonic vibration mechanism, and the ultrasonic vibration mechanism is arranged on the outside of the second clamping member corresponding to the position of the ultrasonic avoidance area. Using this ultrasonic-assisted, step-by-step pressure-adjusting clamping device and heterogeneous material connection method, high clamping pressure heating, low clamping pressure cooling, and non-contact ultrasonic action are used to ensure mechanical anchoring, suppress joint defects, and improve connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings.

[0023] Figure 1 The overall structure of the embodiment 1 of the present invention is shown in FIG. Figure 1 .

[0024] Figure 2 It is a schematic diagram of the overall structure of the clamping mechanism of Example 1 of the present invention.

[0025] Figure 3 It is a schematic cross-sectional diagram of the overall structure of the ultrasonic auxiliary component of Example 1 of the present invention.

[0026] Description of Reference Numerals

[0027] serial number name serial number name 1 Ultrasonic sounder 202 Second clamping member 2 Pressure regulating filter 204 Cylinder mounting block 3 Tee Connector 205 Support rod 4 Pressure regulating valve 206 Flange support 5 Two-position three-way solenoid valve 207 Base Plate 6 Two-position five-way solenoid valve 208 Fuma Wheel 7 Exhaust throttle valve 301 Ultrasonic horn 8 cylinder 302 Rubber ring 9 Switching Power Supply 303 Pipe clamp 10 Temperature Controller 304 Ultrasonic transducer 11 Table program controller 305 Rubber sleeve 12 Thermocouple 306 Expansion sleeve 201 First clamping member 307 Threaded seat 209 Ultrasound avoidance area 210 Laser avoidance area DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The present invention will be further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0032] Example 1

[0033] refer to Figures 1 to 3As shown, an ultrasonic-assisted, step-by-step voltage-adjusting clamping device is used to clamp heterogeneous materials and connect them through ultrasonic-assisted laser, including: a clamping mechanism, the clamping mechanism includes a first clamping member 201, a second clamping member 202, a frame and a power component, a travel space for clamping heterogeneous materials is formed between the first clamping member 201 and the second clamping member 202, the power component is used to drive the first clamping member 201 and the second clamping member 202 to approach or move away from each other, the first clamping member 201 is provided with a laser avoidance area, the second clamping member 202 is provided with an ultrasonic avoidance area 209, and the frame is used to install the clamping mechanism; a control component, the control component includes a control component and a temperature collection component, the temperature collection component is used to collect the temperature of the material to be connected at the laser avoidance area 210 The temperature of the component; the control component is provided with a controller and a storage unit, the storage unit stores at least two temperature thresholds and pressure output matching values ​​corresponding to the temperature thresholds, the controller controls the connection between the clamping mechanism and the temperature acquisition component, and when the temperature acquired by the temperature acquisition component reaches any of the temperature thresholds, the controller adjusts the output force of the power component to the pressure output matching value, so that the dissimilar materials connected between the first clamping member 201 and the second clamping member 202 can fit each other under at least two different preset pressures to form a laminated structure; an ultrasonic auxiliary component, the ultrasonic auxiliary component includes an ultrasonic sounder and an ultrasonic vibration mechanism, and the ultrasonic vibration mechanism is arranged on the outside of the second clamping member 202 corresponding to the position of the ultrasonic avoidance area.

[0034] In this embodiment, the power component includes a cylinder 8, and the control component includes a first air pressure adjusting component, a second air pressure adjusting component, a first solenoid valve and a second solenoid valve. The input end of the first solenoid valve is connected to the first air pressure adjusting component and the second air pressure adjusting component, and the output end of the first solenoid valve is connected to the input end of the second solenoid valve. The first solenoid valve is used to switch the first air pressure adjusting component and the second air pressure adjusting component to change the air pressure connected to the input end of the second solenoid valve, and the second solenoid valve is used to switch the movement state of the piston rod of the cylinder 8; as an example, the control component includes a pressure regulating filter 2 for connecting to an air source, a pressure regulating valve 4 connected to the output end of the pressure regulating filter 2, a two-position three-way solenoid valve 5 and a two-position five-way solenoid valve 6, the pressure regulating filter 2 serves as the first air pressure adjusting component, the pressure regulating valve 4 serves as the second air pressure adjusting component, the two-position three-way solenoid valve 5 serves as the first solenoid valve, and the two-position five-way solenoid valve 6 serves as the second solenoid valve.

[0035] In this embodiment, the control component includes a temperature controller 10 and a table program controller 11 .

[0036] In this embodiment, the ultrasonic vibration mechanism includes an ultrasonic horn 301, an ultrasonic transducer 304 and an ultrasonic base, the ultrasonic transducer 304 is installed on the ultrasonic base, the horn is installed at one end of the ultrasonic transducer 304 away from the ultrasonic base, the ultrasonic base is movably connected to the frame, and can adjust its position based on the frame to change the distance between the ultrasonic horn 301 and the first clamping member 201, the ultrasonic horn 301 and the ultrasonic transducer 304 are connected by threads, and a rubber ring 302 and a rubber ring fixing component are provided at the connection between the two, and the rubber ring fixing component includes two tube clamps 303, and the tube clamps 303 are locked by bolts The ultrasonic transducer 304 is arranged at the periphery thereof and the rubber ring 302 is fixed at the connection between the ultrasonic horn 301 and the ultrasonic transducer 304. The ultrasonic base comprises a threaded seat 307, a tightening sleeve 306 and a rubber sleeve 305. The tightening sleeve 306 is arranged in an expansion mounting groove provided in the threaded seat 307. The rubber sleeve 305 is arranged in the inner ring of the tightening sleeve 306. One end of the transducer connected to the ultrasonic base is inserted into the inner ring of the rubber sleeve 305, and the transducer is connected to the threaded seat 307 through the tightening sleeve 306. The frame comprises a bottom plate 207, and the threaded seat 307 is connected to the bottom plate 207 through threads.

[0037] In this embodiment, the frame includes a base plate 207 and a plurality of supporting components installed on the base plate 207, the upper end of the supporting component is used to support the first clamping member 201, the first clamping member 201 is detachably connected to the supporting component, the lower end of the supporting component is provided with a slide groove with a side opening, the second clamping member 202 can be inserted into the slide groove from the side and approach or move away from the first clamping member 201 in the slide groove under the drive of the power component; as an example, the power component includes a cylinder 8 and a cylinder mounting block 204, the cylinder mounting block 204 is detachably installed on the supporting component and can adjust the distance from the first clamping member 201 based on the supporting component, the supporting component includes a support rod 205, the lower end of the support rod 205 is connected to the base plate 207, the upper end of the support rod 205 is provided with a shoulder and a locking threaded portion for supporting the first clamping member 201, and the first clamping member 201 is provided with a locking hole matching the locking threaded portion.

[0038] The method for connecting dissimilar materials comprises the following steps:

[0039] Step 1: using the above-mentioned ultrasonic-assisted, step-by-step pressure-adjusting clamping device to clamp the components of dissimilar materials to be connected, wherein the components of dissimilar materials include metal components and thermoplastic composite components, and driving the power component through the control component so that the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component are fitted at a first pressure value, the other side of the metal component abuts against the first clamping piece, and the side of the thermoplastic composite component away from the metal component abuts against the second clamping piece;

[0040] Step 2, matching the laser welding device to heat the metal component, and the ultrasonic auxiliary component applies ultrasonic vibration to the component of the heterogeneous material;

[0041] Step 3: When the temperature acquisition component obtains the first temperature value, the control component adjusts the output force of the power component so that the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component are fitted at a second pressure value;

[0042] Step 4: Keep the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component in contact with each other at a second pressure value until laser welding is completed, and control the power component to move the second clamping member away from the first clamping member so as to remove the connected components.

[0043] The following describes the specific parameters used in connecting a component made of aluminum alloy 6061 and a component made of continuous carbon fiber reinforced PEEK resin-based composite material using an ultrasonic-assisted, step-by-step pressure-adjusting clamping device and a method for connecting dissimilar materials in Example 1:

[0044] The laser connection parameters are as follows: laser power 500-800W; scanning speed 600mm / min; scanning times 5 times; defocusing amount 120mm; clamping high pressure 0.7MPA; clamping low pressure 0.3MPA; ultrasonic frequency 25kHz, 28kHz, 33kHz, 40kHz ultrasonic amplitude 5-50μm; ultrasonic horn 301 and specimen distance 10mm; resin full melting temperature 350℃. The connection material is aluminum alloy 6061 and continuous carbon fiber reinforced PEEK resin-based composite material.

[0045] Control component, ultrasonic generator 1 generates ultrasonic vibration signal, pressure regulating filter 2 outputs stable and clean high-pressure gas, and uses three-way connector 3 to divide two gas circuits, one of which is connected to pressure regulating valve 4 to output low-pressure gas, and the other gas circuit maintains high-pressure gas. The two gas circuits are connected to two-position three-way solenoid valve 5. The solenoid valve switch function can provide two pressure gases, and then the two cylinders 8 are controlled by two-position five-way solenoid valve 6 to extend and clamp the workpiece, and the exhaust throttle valve 7 is used to control the cylinder extension speed. The switching power supply 9 supplies power to the table program controller 10 and the temperature controller 11. The temperature controller 11 collects the joint temperature through the thermocouple 12 and feeds it back to the table program controller 10 to control the status of the two solenoid valves according to the program, such as Figure 1 shown.

[0046] The clamping mechanism includes a second clamping member 202 inserted into the slide groove of the first clamping member 201, the first clamping member 201 is tightened with a nut on the upper shoulder of the support rod 205, the cylinder 203 is bolted on the cylinder mounting block 204, both ends of the cylinder mounting block 204 are mounted on the shoulders of the two support rods 205, the bottom of the support rod 205 is inserted into the groove of the bottom plate 207 and fixed with a flange support 206, and four Foma wheels 208 are installed under the bottom plate 207 for easy mobile support. Figure 2 shown.

[0047] The ultrasonic auxiliary component, the ultrasonic horn 301 and the ultrasonic transducer 304 are connected by threads, the two pipe clamps 303 are locked by bolts, and the rubber ring 302 is clamped at the connection between the ultrasonic horn 301 and the ultrasonic transducer 304 to absorb vibration and heat insulation. The bottom of the ultrasonic transducer 304 is inserted into the rubber sleeve 305 inside the expansion sleeve 306, and the expansion effect of the expansion sleeve 306 is used to fix the ultrasonic transducer 304 and the rubber sleeve 305 on the threaded seat 307. The threaded seat 307 is connected to the bottom plate 308 by trapezoidal threads, and the upper and lower positions of the ultrasonic structure can also be adjusted by the trapezoidal threads, such as Figure 3 shown.

[0048] Place the aluminum alloy 6061 and continuous carbon fiber reinforced PEEK resin-based composite workpiece into the second clamping piece 202, and then push the second clamping piece 202 into the lower slide groove of the first clamping piece 201, turn on the air source, turn the pressure regulating knobs of the pressure regulating filter 2 and the pressure regulating valve 4 until both reach the required high pressure of 0.7MPA and low pressure of 0.3MPA, rotate the threaded seat 307 to adjust the distance between the top of the ultrasonic amplitude transformer 301 and the workpiece by 10mm, start the ultrasonic generator 1 and the switching power supply 9, apply ultrasonic vibration to the workpiece through the ultrasonic amplitude transformer 301, extend the two cylinders 8 to clamp the workpiece with high pressure, turn on the laser press The programmed path outputs the laser, and after heating, the thermocouple 12 starts to collect the temperature at the joint. When the temperature reaches 350°C, the temperature controller 11 sends a signal to the table program controller 10. The table program controller 11 controls the state of the two-position three-way solenoid valve 5 according to the program setting, reduces the clamping pressure, and maintains the pressure until the laser stops and the specimen cools to room temperature. The temperature controller 11 sends a stop signal to the table program controller 10. The table program controller 11 controls the state of the two-position five-way solenoid valve 6 according to the program setting, retracts the two cylinders 8 to unload the workpiece, and then turns off the laser, turns off the switch power supply, and turns off the ultrasonic generator.

[0049] The pneumatic staged controlled clamping method for ultrasonically assisted connection of thermoplastic composites and metals of the present invention adopts high clamping pressure heating and low clamping pressure cooling, and utilizes non-contact ultrasonic action to ensure mechanical anchoring, suppress joint defects, and improve connection strength. It can effectively improve the laser connection strength of thermoplastic composites and metals, has strong material adaptability, and high application value, and is adapted to the needs of high-end fields such as aerospace for the connection of thermoplastic composites and metals.

[0050] In the present invention, the first clamping member and the second clamping member are preferably plate-shaped. Of course, other shapes may also be selected as long as they are conducive to clamping to achieve the purpose of the present invention.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an example", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. An ultrasonic-assisted, step-by-step pressure-adjusting clamping device for clamping dissimilar materials and connecting them by ultrasonic-assisted laser, characterized in that: include: A clamping mechanism, the clamping mechanism comprising a first clamping member, a second clamping member, a frame and a power component, a travel space for clamping heterogeneous materials is formed between the first clamping member and the second clamping member, the power component is used to drive the first clamping member and the second clamping member to approach or move away from each other, the first clamping member is provided with a laser avoidance area, the second clamping member is provided with an ultrasonic avoidance area, and the frame is used to install the clamping mechanism; A control component, the control component comprising a control component and a temperature collection component, the temperature collection component is used to collect the temperature of the components to be connected in the laser avoidance area; The control component is provided with a controller and a storage unit, the storage unit stores at least two temperature thresholds and pressure output matching values ​​corresponding to the temperature thresholds, the controller controls the connection between the clamping mechanism and the temperature acquisition component, and when the temperature acquired by the temperature acquisition component reaches any of the temperature thresholds, the controller adjusts the output force of the power component to the pressure output matching value, so that the dissimilar materials connected between the first clamping member and the second clamping member can be attached to each other under at least two different preset pressures to form a laminated structure; The ultrasonic auxiliary component includes an ultrasonic sound generator and an ultrasonic vibration mechanism. The ultrasonic vibration mechanism is arranged on the outside of the second clamping member and corresponds to the position of the ultrasonic avoidance area.

2. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 1, characterized in that: The power component includes a cylinder, and the control component includes a first air pressure adjusting component, a second air pressure adjusting component, a first solenoid valve and a second solenoid valve. The input end of the first solenoid valve is connected to the first air pressure adjusting component and the second air pressure adjusting component, and the output end of the first solenoid valve is connected to the input end of the second solenoid valve. The first solenoid valve is used to switch the first air pressure adjusting component and the second air pressure adjusting component to change the air pressure connected to the input end of the second solenoid valve, and the second solenoid valve is used to switch the movement state of the piston rod of the cylinder.

3. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 2 is characterized in that: The control component includes a pressure regulating filter for connecting to an air source, a pressure regulating valve connected to the output end of the pressure regulating filter, a two-position three-way solenoid valve and a two-position five-way solenoid valve. The pressure regulating filter serves as the first air pressure adjusting component, the pressure regulating valve serves as the second air pressure adjusting component, the two-position three-way solenoid valve serves as the first solenoid valve, and the two-position five-way solenoid valve serves as the second solenoid valve.

4. An ultrasonically assisted, step-by-step pressure-adjusting clamping device according to any one of claims 1 to 3, characterized in that: The control assembly includes a temperature controller and a table program controller.

5. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 4, characterized in that: The ultrasonic vibration mechanism includes an ultrasonic horn, an ultrasonic transducer and an ultrasonic base, wherein the ultrasonic transducer is mounted on the ultrasonic base, the horn is mounted on an end of the ultrasonic transducer away from the ultrasonic base, and the ultrasonic base is movably connected to the frame and can adjust its position based on the frame to change the distance between the ultrasonic horn and the first clamping member.

6. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 5, characterized in that: The ultrasonic horn is connected to the ultrasonic transducer by threads, and a rubber ring and a rubber ring fixing component are provided at the connection between the two. The rubber ring fixing component includes two tube clamps, and the tube clamps are fastened to the outer periphery of the ultrasonic transducer by bolts and fix the rubber ring to the connection between the ultrasonic horn and the ultrasonic transducer.

7. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 5, characterized in that: The ultrasonic base includes a threaded seat, an expansion sleeve and a rubber sleeve. The expansion sleeve is arranged in an expansion installation groove provided on the threaded seat, and the rubber sleeve is arranged on the inner ring of the expansion sleeve. One end of the transducer connected to the ultrasonic base is inserted into the inner ring of the rubber sleeve, and the transducer is connected to the threaded seat through the expansion sleeve. The frame includes a bottom plate, and the threaded seat is connected to the bottom plate through threads.

8. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 1, characterized in that: The frame includes a base plate and a plurality of supporting components installed on the base plate, the upper end of the supporting component is used to support the first clamping member, the first clamping member is detachably connected to the supporting component, the lower end of the supporting component is provided with a slide groove with a side opening, the second clamping member can be inserted into the slide groove from the side and approach or move away from the first clamping member in the slide groove under the drive of the power component.

9. The ultrasonic-assisted, step-by-step pressure-adjusting clamping device according to claim 8, characterized in that: The power component includes a cylinder and a cylinder mounting block. The cylinder mounting block is detachably mounted on the support component and can adjust the distance from the first clamping member based on the support component. The support component includes a support rod. The lower end of the support rod is connected to the base plate. The upper end of the support rod is provided with a shoulder and a locking threaded portion for supporting the first clamping member. The first clamping member is provided with a locking hole matching the locking threaded portion.

10. A method for connecting dissimilar materials, characterized in that: The steps include: Step 1: using an ultrasonic-assisted, step-by-step pressure-adjusting clamping device as described in any one of claims 1 to 9 to clamp components of dissimilar materials to be connected, wherein the components of dissimilar materials include metal components and thermoplastic composite components, and driving the power component through the control component so that the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component are fitted at a first pressure value, the other side of the metal component abuts against the first clamping piece, and the side of the thermoplastic composite component away from the metal component abuts against the second clamping piece; Step 2, matching the laser welding device to heat the metal component, and the ultrasonic auxiliary component applies ultrasonic vibration to the component of the heterogeneous material; Step 3: When the temperature acquisition component obtains the first temperature value, the control component adjusts the output force of the power component so that the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component are fitted at a second pressure value; Step 4: Keep the area to be welded on one side of the metal component and the area to be welded on the thermoplastic composite component in contact with each other at a second pressure value until laser welding is completed, and control the power component to move the second clamping member away from the first clamping member so as to remove the connected components.

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