CN113492533A - Ultrasonic welding device and welding method for welding high-durability ultrasonic structure - Google Patents
Ultrasonic welding device and welding method for welding high-durability ultrasonic structure Download PDFInfo
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- CN113492533A CN113492533A CN202110656319.XA CN202110656319A CN113492533A CN 113492533 A CN113492533 A CN 113492533A CN 202110656319 A CN202110656319 A CN 202110656319A CN 113492533 A CN113492533 A CN 113492533A
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- 238000003466 welding Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003825 pressing Methods 0.000 claims description 32
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- 241000237942 Conidae Species 0.000 claims description 5
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- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000010008 shearing Methods 0.000 description 12
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- 239000012510 hollow fiber Substances 0.000 description 6
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- 229920003023 plastic Polymers 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
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- 238000007596 consolidation process Methods 0.000 description 1
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- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7841—Holding or clamping means for handling purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
Abstract
A welding device for welding a high-durability ultrasonic structure comprises a first clamping part (101), wherein the first clamping part (101) is arranged on a rack (100) in a vertically movable mode, a rotating base (104) is rotatably arranged in an inner hole of the first clamping part (101), the ultrasonic mechanism (50) is fixed in the inner hole of the rotating base (104), the ultrasonic mechanism (50) is connected with a first component (10), and the rotating base (104) is fixedly connected with a rotary booster (60); the rotary supercharger (60) is fixed on the frame (100); and a second clamping part (102), wherein the second clamping part (102) is coaxially fixed below the first clamping part (101), and the second member (20) is fixed and supported on the second clamping part (102). The welding device and the welding method for welding the high-durability ultrasonic structure have the advantages of simple structure and easiness in modification and implementation on the basis of the conventional ultrasonic welding device.
Description
Technical Field
The invention relates to the technical field of plastic part welding, in particular to an ultrasonic welding device and method for welding a high-durability ultrasonic structure.
Background
In the hollow fiber membrane type blood purifier, a blood permeation module is generally formed at both ends of a hollow fiber membrane bundle with a potting material such as polyurethane and fixed in a main tube container, an inlet stock solution tube and an outlet stock solution tube are ultrasonically welded at both axial ends of the main tube container, and a side port is integrally formed in the main tube container perpendicular to the axial direction. Blood to be dialyzed from a human body enters the hollow fibers of the hemodialysis module from the inlet liquid accumulating pipe and then flows out from the outlet liquid accumulating pipe at the other end to return to the human body, dialysate flows into the inner cavity of the main body pipe container from the lower side port, flows through the hollow fibers and flows out from the upper side port, and waste, surplus electrolyte and water in the blood enter the dialysate through the hollow fibers and are discharged out of the blood along with the dialysate. Ultrasonic welding of the inlet and outlet manifolds to the main body vessel requires liquid and gas tightness.
The ultrasonic welding device presses the overlapped parts of the two plastic parts on the anvil through the ultrasonic welding head, and simultaneously applies ultrasonic vibration and pressure to connect the two plastic parts. For ultrasonic welding of the inlet and outlet manifolds to the main body vessel, proper joint design is critical to achieving optimal welding results. In addition to this, the following problems are often liable to occur:
(1) the desired weld strength was not achieved. (2) And poor air-tightness or liquid-tightness. (3) Cracks occur in the article. The crack generation is often caused by resonance destruction caused by ultrasonic vibration. In order to check the connection strength and the air tightness of the welding interface, the air tightness, the pressure bearing capacity and the burst pressure of the workpiece are usually checked by a hydraulic test. (4) Flashing occurs. Flash generation occurs primarily at weld line overflow locations. (5) The surface is scratched, and the surface of the welding part can be scratched due to the pressure of the ultrasonic head. Flashing and scratching mainly affect the appearance of the product.
In conclusion, ultrasonic welding is less strong and not suitable for high durability structural welding.
The ultrasonic welding structure disclosed by Jiangsu Asia electronic Jiangsu Limited company (TW201341093A, published: 2013, 10, 16), wherein the welding surface is changed from a vertical surface to an inclined surface, so that a first member 10 is pressed along a pressing direction A and welded and bonded to a second member 20, the ultrasonic welding structure comprises: a welding surface 11 formed on one of the first member and the second member, the welding surface being an inclined plane relative to the pressing direction; and an energy guiding flange 22 corresponding to the welding surface and formed on the other of the first member and the second member, for generating a contact pressure by the energy guiding flange corresponding to the welding surface when the first member is pressed on the second member along the pressing direction, and ultrasonically welding the first member and the second member. Namely, the energy-conducting flanges 22 are pressed by the inclined planes 11 and are simultaneously bonded by ultrasonic melting, so that the defect of poor connection of the vertical circumferential surfaces is well eliminated, and the consolidation strength is increased. The energy guide flange is substantially melted to form an inclined welding surface by converting ultrasonic vibration energy into frictional heat before the energy guide flange is subjected to surface contact with a large area, but the welding structure still has room for improvement.
The japan asahi chemical industry co ltd discloses an ultrasonic welding joint and a welding method of a liquid accumulating tube 5 of a hollow fiber membrane filter and a main body tube container 2 (JP2020179371A, published: 2020, 11.5), the end of the main body tube container is provided with a mortise 52, the mortise 52 comprises an inner annular protrusion 50 and an outer annular protrusion 51, the inner annular protrusion 50 is provided with a lower stop slope, when the annular tenon 22 of the liquid accumulating tube 5 is inserted into the mortise 52, the slope guide surface of the outer annular protrusion 51 exerts an external force inwards in a radial direction to finally form two welding seams of W1 and W3, so as to increase the welding strength and prevent the top surface of the liquid accumulating tube 5 from being scratched. However, the ultrasonic welding seam still has the problem that the thickness of the melting layer is too thin, so that the welding strength is not enough.
The correct joint structure is designed to achieve the expected welding strength, ensure the air tightness or liquid tightness, prevent cracks, flash and surface scratches and form high-durability structural welding, which is a key technical problem of an ultrasonic welding device.
Disclosure of Invention
In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a high-durability ultrasonic welding apparatus for ultrasonic structural welding and a welding method thereof, which solve the problems of low welding strength, difficulty in ensuring air tightness or liquid tightness, and preventing cracks and scratches to realize an ultrasonic welding process.
The object of the present invention is achieved by a welding apparatus for ultrasonic structural welding having high durability, which presses and fusion-bonds a tenon of a first member to a mortise of a second member in a pressing direction A,
the first clamping part is arranged on the rack in a vertically movable manner, a rotating base is rotatably arranged in an inner hole of the first clamping part, the ultrasonic mechanism is fixed in the inner hole of the rotating base, the ultrasonic mechanism is connected with the first component, and the rotating base is fixedly connected with the rotary supercharger; the rotary supercharger is fixed on the frame;
the second clamping part is coaxially fixed below the first clamping part, and the second component is fixed and supported on the second clamping part.
Furthermore, the rotary supercharger comprises a driving nut sleeve and a screw shaft, the screw shaft is spirally matched in the driving nut sleeve, and the screw shaft is fixedly connected with an output shaft of the stepping motor through a coupler; the end part of the screw shaft is provided with a pressurizing oil cavity, a pressurizing piston is arranged in the pressurizing oil cavity, and the pressurizing piston is fixedly connected with the rotating base.
Further, rotating base includes integrated into one piece's seat portion and seat portion down, link up the hole and run through seat portion and seat portion setting down, and seat portion includes that upper plate, medium plate and interval locate a plurality of cross ribs between medium plate and the upper plate, and the position of medium plate between a plurality of cross ribs is equipped with a plurality of supersound fixed parts, and supersound mechanism wears to be equipped with and link up hole and fixed mounting in supersound fixed part.
Further, lower seat portion includes the hypoplastron, hypoplastron and medium plate fixedly connected with centering awl shell, and the toper hole of first clamping part is located through tapered roller bearing rotation to centering awl shell, and end face bearing locates between medium plate and the first clamping part.
Furthermore, the rack is provided with 4 guide sliding rods, and the guide sliding rods are provided with first clamping parts in a sliding manner; the second clamping part is fixed at one end of the guide sliding rod.
Further, the ultrasonic mechanism comprises a converter, an amplitude transformer and an ultrasonic head which are coaxially and fixedly connected, and the ultrasonic head is connected with the first component; still include the fixing base, the fixing base includes the closure shell and stretches out a plurality of end flanges of closure shell, converter fixed connection in the closure shell, and supersound mechanism wears to be equipped with and link up the hole and pass through end flange fixed mounting in supersound fixed part.
The device further comprises a microprocessor, and a displacement sensor, a first pressure sensor and a second pressure sensor which are electrically connected with the microprocessor, wherein the displacement sensor is used for detecting the pressing distance of the first member driven by the rotary supercharger to press downwards; the first pressure sensor is used for detecting the abutting pressure of the first member abutting against the second member along the pressing direction A; the second pressure sensor is used for detecting the abutting pressure of the first member abutting against the second member along the direction perpendicular to the pressing direction A.
Furthermore, along the pressing direction A, the first component is screwed into the spiral groove between the outer spiral edges of the second component through the inner spiral edges of the tenon, and the screw pitch of the spiral matching of the driving nut sleeve and the screw shaft is equal to the screw pitch of the spiral matching of the inner spiral edges and the outer spiral edges.
An automatic welding method of the welding device is provided,
1) screw ridge screwing in
The rotation stopping stud is abutted against the output worm wheel for rotation stopping positioning, the handle is rotated to enable the tenon of the first component to be screwed into the mortise of the second component until the inclined shoulder of the tenon is abutted against the energy guiding flange of the mortise and generates abutting pressure, and then the operation is stopped;
2) ultrasonic vibration pressing down simultaneously
And starting the ultrasonic mechanism and simultaneously pressing down the rotary supercharger, enabling the abutting pressure of the oblique shoulder abutting energy-guiding flange to reach a preset pressure when the downward moving distance detected by the displacement sensor is equal to the downward moving distance, meanwhile, enabling the pressure exerted by the outer wall of the mortise on the centering of the tenon to also reach a preset pressure, stopping ultrasonic vibration and pressing down the rotary supercharger, and keeping the preset pressure for at least 10 seconds.
Further, S0, clamping and aligning
The rotary supercharger is switched to be in an electric state, the worm gear motor is started to rotate forwardly, the first clamping part is moved upwards quickly, the first clamping part is made to adsorb the first component through the coaxial negative pressure of the ultrasonic mechanism, and the second component is placed in the central hole of the second clamping part to be supported and positioned coaxially. Then the worm gear motor is started to rotate reversely, and the first clamping part is moved downwards quickly, so that the tenon of the first component is aligned with the mortise of the second component.
According to the welding device and the welding method for the high-durability ultrasonic structure welding, the rotary pressurizer is used for completing screwing action, meanwhile, the rotary pressurizer is used for completing pressing action, the ultrasonic mechanism is matched, the annular top shearing welding part and the annular side shearing welding part are simultaneously realized through one-time ultrasonic welding operation, the welding implementation of the spiral shearing welding surface and the auxiliary annular shearing welding surface is completed for the first time, the structure is simplified, and the improvement implementation is easy on the basis of the existing ultrasonic welding device.
Drawings
FIG. 1 is a front sectional view of a first embodiment of an ultrasonic welding apparatus for welding a high durability ultrasonic structure according to the present invention.
Fig. 2 is a front sectional view of a rotary base (in a fastened state) of a first embodiment of an ultrasonic welding apparatus for welding a high-durability ultrasonic structure according to the present invention.
Fig. 3 is a front sectional view of a rotary base (in a mounted state) of a first embodiment of an ultrasonic welding apparatus for welding a high-durability ultrasonic structure of the present invention.
Fig. 4 is a partially enlarged view I of fig. 1 of an embodiment of an ultrasonic welding apparatus for welding a high durability ultrasonic structure according to the present invention.
FIG. 5 is a front cross-sectional view of a high durability ultrasonic structure of the present invention prior to welding.
FIG. 6 is a cross-sectional elevation view of a welded assembly of a high durability ultrasonic structural weld of the present invention.
Reference numerals in the above figures:
10 first component, 11 tenon, 12 inclined shoulder, 13 internal screw ridge, 14 small diameter cylindrical portion, 15 internal shoulder stop portion, 16 large diameter cylindrical portion, 17 sealing ring and 18 reinforced fibre cloth layer
20 second member, 21 tongue and groove, 22 energy-guiding flange, 23 external screw rib, 24 stop ring
30 top shear weld, 40 side shear weld
100 machine frame, 101 first clamping part, 102 second clamping part and 103 slide guide rod
50 ultrasonic mechanism, 51 converter, 52 horn, 53 ultrasonic head, 54 fixing seat, 55 closed shell, 56 end flange and 57 negative pressure cavity
60 rotary pressurizer, 61 driving nut sleeve, 62 screw shaft, 63 end flange, 64 pressurizing oil cavity, 65 pressurizing piston, 66 rotation stopping stud, 67 worm gear motor, 68 transmission joint and 69 handle
70 microprocessor, 71 displacement sensor, 72 first pressure sensor 72, 73 second pressure sensor
80 rotating base, 81 upper seat part, 82 lower seat part, 83 through inner hole, 84 upper plate, 85 middle plate, 86 cross plate rib, 87 ultrasonic fixing ring, 88 fastening flange, 89 centering cone
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings, but is not intended to limit the scope of the invention.
Example 1
A high-durability welding device for ultrasonic structure welding comprises a machine frame 100, wherein 4 guide sliding rods 103 are arranged on the machine frame 100, a first clamping portion 101 is arranged on each guide sliding rod 103 in a sliding mode, a second clamping portion 102 is arranged opposite to the first clamping portion 101 in the pressing direction, and the second clamping portion 102 is fixed at one end of each guide sliding rod 103. A rotary base 80 is rotatably and adjustably arranged in an inner hole of the first clamping part 101, the ultrasonic mechanism 50 is fixed in the inner hole of the rotary base 80, the ultrasonic mechanism 50 is connected with the first component 10, and the rotary base 104 is fixedly connected with the rotary supercharger 60.
The rotary pressurizer 60 can screw the tenon 11 of the first member 10 into the mortise 21 of the second member 20 and generate an abutting pressure; the first member can then be brought to move linearly downward to provide a linearly increasing depression pressure.
The rotary base 80 includes an upper seat portion 81 and a lower seat portion 82 which are integrally provided, a through inner hole 83 is provided to penetrate through the upper seat portion 81 and the lower seat portion 82, the upper seat portion 81 includes an upper plate 84, a middle plate 85, and a plurality of cross ribs 86 which are provided between the middle plate 85 and the upper plate 84 at intervals, and an ultrasonic fixing portion 87 is provided at a position of the middle plate 85 between the plurality of cross ribs 86. The lower seat portion 82 comprises a centering cone shell 89, the centering cone shell 89 is rotatably arranged in a conical inner hole of the first clamping portion 101 through a conical roller bearing, and an end face bearing is arranged between the middle plate 85 and the first clamping portion 101. The lower part of the centering cone shell 89 is provided with a fastening flange 88 in a rotatable and positioning way.
The ultrasonic mechanism 50 comprises a converter 51, a horn 52 and an ultrasonic head 53 which are coaxially and fixedly connected, wherein the ultrasonic head 53 is connected with the first member 10. The ultrasonic mechanism further comprises a fixing seat 54, the fixing seat 54 comprises a closed body shell 55 and an end flange 56 extending out of the closed body shell, the converter 51 is fixedly connected into the closed body shell 55, and the ultrasonic mechanism 50 is provided with a through inner hole 83 in a penetrating mode and is fixedly installed in an ultrasonic fixing portion 87 through the end flange 56. The ultrasonic head 53 sucks the first member 10 through the negative pressure chamber 57.
A microprocessor 70 is also included for controlling time, energy and displacement. The microprocessor 70 further includes a displacement sensor 71, and the displacement sensor 71 is used for detecting the pressing distance of the first member 10 driven by the rotary supercharger 60. A first pressure sensor 72 and a second pressure sensor 73, wherein the first pressure sensor 72 is used for detecting the abutting pressure of the inclined shoulder part 12 of the first component abutting against the energy-guiding flange 22 of the second component along the pressing direction A; the second pressure sensor 73 is used for detecting the abutting pressure of the inner convex edge of the first member 10 abutting the outer convex edge of the second member along the direction perpendicular to the pressing direction a.
The rotary supercharger 60 includes a driving nut sleeve 61 and a screw shaft 62, the screw shaft 62 is screwed into the driving nut sleeve 61, and the driving nut sleeve 61 is coaxially disposed on and fixedly connected to an output worm wheel of the worm gear motor 67. The worm gear motor 67 is fixedly arranged on the end flange 63, and the end flange 63 is fixedly connected with the machine frame 100. The end of the screw shaft 62 is provided with a pressurizing oil chamber 64, a pressurizing piston 65 is arranged in the pressurizing oil chamber 64, and the pressurizing piston 65 is fixedly connected with the rotating base 80 through a transmission joint 68. The outer wall of the worm gear motor 67 is provided with a rotation stopping stud 66, the rotation stopping stud 66 is screwed in and tightly abuts against the output worm gear, and the output worm gear stops rotating, so that the driving nut sleeve 61 stops rotating. The screw shaft 62 has a trapezoidal cross section. The top end of the screw shaft 62 is fixedly connected with a hand wheel 69.
The rotary supercharger 60 has three operating states, an electric state, a manual state, and a supercharging state. In the electric state, the rotation stopping stud 66 is loosened, the worm gear motor 67 is started, the worm drives the output worm gear, the output worm gear drives the driving nut sleeve 61 to rotate, the screw shaft 62 in screw fit with the driving nut sleeve is rapidly moved up and down, and therefore the first component 10 is rapidly aligned with the second component 20 before welding or the ultrasonic mechanism 50 and the first clamping component 101 are rapidly moved up to take away a welded component after welding. And the manual state is: when the first member 10 is aligned with the second member 20 quickly, the rotation stop stud 66 abuts against the output worm wheel, the hand wheel 69 is rotated, and the driving nut sleeve 61 matched with the hand wheel 69 is stopped at the moment, so that the screw shaft 62 rotates and moves downwards, the rotation matching of the spiral groove between the inner spiral ridges 13 of the tenon and the outer spiral ridges 23 of the mortise and the movement of moving downwards are completed, and the inclined shoulder part 12 of the first member 10 abuts against the energy guide flange 22 of the second member 20 and reaches the abutting pressure. The supercharging state is as follows: the oil is fed into the pressurizing oil chamber 64 to push the pressurizing piston 65 to move downwards, the pressurizing piston 65 pushes the transmission joint 68, and the transmission joint 68 pushes the rotating base 80 and the first clamping member 101 to move downwards, so that the ultrasonic mechanism 50 and the first member 10 are driven to move downwards, and ultrasonic structural welding is cooperatively completed along with ultrasonic vibration in the process.
The pitch of the screw threads of the driving nut case 61 and the screw shaft 62 is equal to the matching pitch of the screw threads of the inner and outer screw ridges so that the screw shaft 62 moves down by a length equal to the length of the tenon moving into the mortise when the outer screw ridge is screwed into the groove between the inner screw ridges.
A welding method of the welding device comprises the following steps:
s1, screwing the ridge
The rotary booster 60 is switched to a manual state, the rotation stopping stud 66 abuts against the output worm wheel for rotation stopping positioning, the handle 69 is rotated to enable the tenon 11 of the first component 10 to be screwed into the mortise 21 of the second component 20 until the inclined shoulder 13 abuts against the energy guiding flange 22 and generates an abutting pressure F1And then stop.
S2, ultrasonic vibration and pressing down simultaneously
The ultrasonic mechanism 50 is started and the rotary booster 60 is started to press down, so that the displacement is transmittedThe distance of downward movement detected by sensor 71 is equal to the distance of depression H0And when the abutment pressure reaches a predetermined pressure, the ultrasonic vibration and the downward movement of the rotary booster 60 are stopped, and the predetermined pressure is maintained for at least 10 seconds.
Before step S1, the method further includes the following steps:
s0, clamping and aligning
The rotary booster is switched to an electric state, the worm gear motor 67 is started to rotate positively, the first clamping part 101 is moved upwards quickly, the first clamping part 101 absorbs the first component 10 through the ultrasonic mechanism 50 in a coaxial negative pressure mode, and the second component 20 is placed in the central hole of the second clamping part 102 to be supported and positioned in a coaxial mode. The worm gear motor 67 is then activated to rotate in reverse, moving the first clamping portion 101 down rapidly so that the tenon of the first member is aligned with the mortise of the second member.
The welding device realizes high-durability ultrasonic structural welding so as to press and weld the tenon 11 of the first component 10 to the mortise 21 of the second component 20 along the pressing direction A, the inner wall of the tenon 11 is sequentially provided with a large-diameter cylindrical part 16, an inclined shoulder part 12 and an inner shoulder stopping part 15, and the large-diameter cylindrical part 16 is provided with an inner screw ridge 13; the mortise 21 is an annular groove formed by an inner wall 21.1 and an outer wall 21.2. The inner wall 21.1 is provided with an outer screw edge 23 matched with the inner screw edge 13, the inner edge of the top of the inner wall of the mortise is provided with an energy guiding flange 22, and the energy guiding flange 22 can abut against the inclined shoulder part 12 along the pressing direction; a stop ring 24 is arranged on the outer wall of the mortise 21; the tenon 11 is screwed into the mortise slot 21 in a screw fit until the inclined shoulder 12 abuts against the energy guiding flange 22 to start ultrasonic vibration while being pressed down until the inner shoulder stopper 15 abuts against the top face of the snap ring 24 to simultaneously form the top shear weld 30 and the side shear weld 40; under the action of ultrasonic vibration along the pressing direction, the oblique shoulder part 12 of the tenon cuts the energy-guiding flange 22 to form a top shearing welding part 30, and the inner spiral ridge 13 continuously cuts the outer spiral ridge 23 to form the side shearing welding part 40. When pressed down until the inner shoulder stopper 15 abuts the top surface of the stopper ring 24, accompanied by the abutment pressure F1Linearly up to a predetermined pressure and the control of the process is accomplished by the controller. The abutment pressure F1 along the pressing direction is provided by an ultrasonic head, and the annular tenon 11 applies the pressure F to the lateral centripetally of the inner wall of the mortise 21 along the direction vertical to the pressing direction2Provided by the outer wall of the mortise slot 21。
Except the outer wall 21.2 of the mortise 21, the diameter of which is less than or equal to the positioning outer diameter of the positioning convex rib 18 by at least 0.01mm, the outer wall 21.2 has an inclination angle alpha, the inclination angle alpha is 1 degree, so that the diameter of the top of the outer wall is greater than the diameter of the root of the outer wall, and the lateral centripetal pressure F is applied2Linearly increasing as the tenon moves down, the radial centripetal force F applied when the inner shoulder stop 15 abuts the top surface of the stop ring 242A maximum predetermined pressure is reached.
The welding device and the welding method for welding the high-durability ultrasonic structure solve the technical problem of simply and efficiently realizing a welding process while increasing the welding strength of a welded structure by adopting the following technical means,
(1) the ultrasonic mechanism is cooperated with the rotary booster to simultaneously apply ultrasonic vibration and abutting pressure
The welding device is matched with and used for welding a high-durability ultrasonic structure, the action of screwing the tenon into the mortise is completed while rotating, moving downwards, and then ultrasonic vibration and pressing are needed to be applied, namely, a mechanism for screwing action is added into the ultrasonic mechanism and the pressing mechanism. The rotary booster accomplishes both a screw-in action and a hold-down action upon application of ultrasound. The two methods need to cooperate with each other to complete the two-step welding process.
(2) The rotary booster moves downwards by rotating first and then by boosting
The supercharger 60 is rotated to realize the screwing and downward movement of the inner screw ridge when the inner screw ridge is screwed between the outer screw ridges by using the screw pitch of the driving nut sleeve equal to the matching screw pitch of the inner screw ridge and the outer screw ridge. In the manual state, the handle 68 is rotated, the screw shaft 62 with the same pitch is matched with the rotation stop driving nut sleeve 61 in a rotating mode to realize rotating and downward moving actions, in the pressurization state, oil is fed into a pressurization oil cavity, a pressurization piston is pressed downwards, and the pressurization and downward moving actions can be continuously completed after the screwing-in action is completed. And the inner hole of the first clamping part is used for rotatably arranging the rotating base 80, and the ultrasonic mechanism is arranged in the rotating base 80, so that the pressurizing downward movement of the screw shaft 62 of the rotary pressurizer does not influence the application of the ultrasonic vibration of the ultrasonic mechanism.
(3) Pioneering ultrasonic welding of spiral shear weld faces
Unlike the usual mating of the screw flights to the roots of the helical grooves, the inner screw flight 13 and the outer screw flight 23 of the present invention have only an overlap in the press-fit direction, which is only a shear interference of less than or equal to 0.3mm in axial shear. An axial abutment pressure is generated when the shoulder 12 and the energy guiding flange 22 are brought together, while the width of the overlapping portion is a shear interference to ensure that the shear-weld faces have a sufficient amount of molten plastic. The side shear weld 40 is a helical shear weld extending helically between the tongue and groove and spiraling at least 360 °. Prerequisites for ultrasonic welding are: pressure, weld duration, and ultrasonic vibration (frequency and amplitude), while additional conditions for the side shear weld 40 to form are: the length of the middle point position of the overlapped part along the stitching direction is a shearing length W0Distance of pressing down H0Equal to the shearing length W0. The effect is that the top shear weld 30 and the side shear weld 40 are formed simultaneously.
For the ultrasonic welding of the top shear weld 30 and the side shear weld 40 described above, a special rotary booster 60 is designed in conjunction with the ultrasonic mechanism 50 to effect the ultrasonic welding.
According to the welding device and the welding method for the high-durability ultrasonic structure welding, the rotary pressurizer is used for completing screwing action, meanwhile, the rotary pressurizer is used for completing pressing action, the ultrasonic mechanism is matched, the annular top shearing welding part and the annular side shearing welding part are simultaneously realized through one-time ultrasonic welding operation, the welding implementation of the spiral shearing welding surface and the auxiliary annular shearing welding surface is completed for the first time, the structure is simplified, and the improvement implementation is easy on the basis of the existing ultrasonic welding device.
Claims (10)
1. A welding device for ultrasonic structural welding of high durability, which presses and fusion-bonds a tenon (11) of a first member (10) to a mortise (21) of a second member (20) in a pressing direction A,
the ultrasonic vibration device comprises a first clamping part (101), wherein the first clamping part (101) is arranged on a rack (100) in a vertically movable manner, a rotating base (104) is rotatably arranged in an inner hole of the first clamping part (101), the ultrasonic mechanism (50) is fixed in the inner hole of the rotating base (104), the ultrasonic mechanism (50) is connected with a first component (10), and the rotating base (104) is fixedly connected with a rotary booster (60); the rotary supercharger (60) is fixed on the frame (100);
and a second clamping part (102), wherein the second clamping part (102) is coaxially fixed below the first clamping part (101), and the second member (20) is fixed and supported on the second clamping part (102).
2. The welding device according to claim 1, wherein the rotary booster (60) comprises a driving nut sleeve (61) and a screw shaft (62), the screw shaft (62) is screwed in the driving nut sleeve (61), and the screw shaft (62) is fixedly connected with an output shaft of the stepping motor (66) through a coupling; the end part of the screw shaft (62) is provided with a pressurizing oil cavity (64), a pressurizing piston (65) is arranged in the pressurizing oil cavity (64), and the pressurizing piston (65) is fixedly connected with the rotating base (104).
3. The welding device according to claim 2, wherein the rotary base (80) includes an upper seat portion (81) and a lower seat portion (82) which are integrally formed, a through bore (83) is provided through the upper seat portion (81) and the lower seat portion (82), the upper seat portion (81) includes an upper plate (84), a middle plate (85), and a plurality of cross ribs (86) which are provided between the middle plate (85) and the upper plate (84) at intervals, the middle plate (85) is provided with a plurality of ultrasonic fixing portions (87) at portions between the plurality of cross ribs (86), and the ultrasonic mechanism (50) is provided with the through bore (83) and is fixedly installed in the ultrasonic fixing portions (87).
4. The welding device according to claim 1, characterized in that the lower seat (82) comprises a lower plate (88), a centering cone shell (89) is fixedly connected to the lower plate (88) and the middle plate (85), the centering cone shell (89) is rotatably arranged in the tapered inner hole of the first clamping portion (101) through a tapered roller bearing, and an end face bearing is arranged between the middle plate (85) and the first clamping portion (101).
5. Welding device according to claim 1, wherein the frame (100) is provided with 4 guide bars (103), the guide bars (103) being slidably provided with the first gripping portion (101); the second clamping part (102) is fixed at one end of the guide rod (103).
6. Welding device according to claim 3, wherein the ultrasonic means (50) comprises a coaxially fixedly connected transducer (51), a horn (52), a sonotrode (53), said sonotrode (53) being connected to said first member (10); still include fixing base (54), fixing base (54) include obturator shell (55) and stretch out a plurality of end flanges (56) of obturator shell, and converter (51) fixed connection is in obturator shell (55), and supersound mechanism (50) are worn to be equipped with and are link up hole (83) and pass through end flange (56) fixed mounting in supersound fixed part (87).
7. The welding device according to any one of claims 1 to 4, comprising a microprocessor (70), and further comprising a displacement sensor (71), a first pressure sensor (72) and a second pressure sensor (73) electrically connected to the microprocessor (70), wherein the displacement sensor (71) is used for detecting a pressing distance of the rotary booster (60) driving the first member (10) to press down; the first pressure sensor (72) is used for detecting the abutting pressure of the first component abutting against the second component along the pressing direction A; the second pressure sensor (73) is used for detecting the abutting pressure of the first component (10) abutting against the second component along the direction perpendicular to the pressing direction A.
8. Welding device according to claim 2, characterized in that in the pressing direction a the first component (10) is screwed into the helical groove between the outer ridges (23) of the second component by means of the inner ridges (13) of the tenon, and the pitch of the screw engagement of the driving nut socket (61) with the screw shaft (62) is equal to the pitch of the screw engagement of the inner ridges (13) with the outer ridges (23).
9. An automatic welding method of a welding apparatus according to claims 1 to 5,
1) screw ridge screwing in
The rotation stopping stud (66) is abutted against the rotation stopping location of the output worm gear, the handle (69) is rotated to enable the tenon (11) of the first component (10) to be screwed into the mortise (21) of the second component (20) until the inclined shoulder (13) of the tenon is abutted against the energy guiding flange (22) of the mortise and an energy guiding flange (22) of the mortise is generatedAn abutment pressure (F)1) Stopping the operation;
2) ultrasonic vibration pressing down simultaneously
The ultrasonic mechanism (50) is started and the supercharger (60) is rotated to press down, and the downward movement distance detected by the displacement sensor (71) is equal to the pressing-down distance (H)0) An abutting pressure (F) at which the inclined shoulder (13) abuts the energy guide flange (22)1) A predetermined pressure is reached, while the outer wall of the groove (21) exerts a centripetal pressure (F) on the tenon (11)2) A predetermined pressure is also reached, and the ultrasonic vibration and the depression of the rotary booster (60) are stopped, and the predetermined pressure is maintained for at least 10 seconds.
10. The automatic welding method according to claim 9, further comprising, before step S1, the steps of:
s0, clamping and aligning
The rotary supercharger is switched to be in an electric state, the worm gear motor (67) is started to rotate forwardly, the first clamping part (101) is moved upwards quickly, the first clamping part (101) is enabled to adsorb the first component (10) through the ultrasonic mechanism (50) in a coaxial negative pressure mode, and the second component (20) is placed in a central hole of the second clamping part (102) to be supported and positioned in a coaxial mode; then the worm gear motor (67) is started to rotate reversely, and the first clamping part (101) is moved downwards rapidly, so that the tenon of the first component is aligned with the mortise of the second component.
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