A kind of ultrasonic brazing unit for sheet metal and welding method thereof
Technical field
The present invention relates to metal welding techniques field, especially a kind of ultrasonic brazing unit for sheet metal.
Background technology
Ultrasonic bonding is junction high-frequency vibratory energy being delivered to workpiece to be welded, in this region, vibrational energy makes the surperficial phase mutual friction of workpiece to be welded and forms the staggered infiltration fusion between molecular layer, realizes quick, energy-conservation, no-spark, welding close to cool grinding; Make identical or different workpiece combine between do not produce oxidation change good condition basis on, the conductance of virgin metal can be kept, the weld job between various metal can be widely used in.Chinese invention patent CN 101905376 B discloses a kind of ultrasonic brazing unit and a kind of ultrasonic welding method.But ultrasonic bonding of the prior art is accurate not for the vibration friction control of solder side, and cause ultrasonic bonding compared with other traditional welding method, weldquality is poor.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of ultrasonic brazing unit for sheet metal, can solve the deficiencies in the prior art, improve the weldquality of ultrasonic bonding.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
A kind of ultrasonic brazing unit for sheet metal, comprise ultrasonic transducer, ultrasonic transformer and weld mold, welding base is provided with below weld mold, hydraulic stem is connected with above weld mold, described ultrasonic transformer comprises the first end and the second end that are separated and arrange, and weld mold is fixed between first end and the second end, and first end is fixed on ultrasonic transducer, the second end is fixed with balance weight, between first end and the second end, is connected with balancing pole; Weld mold comprises pedestal, pedestal is fixed between first end and the second end, plumb joint is fixed with below pedestal, slide and be socketed with soldering sleeve in the outside of plumb joint, the length of soldering sleeve is greater than the length of plumb joint, the diameter of soldering sleeve from top to bottom increases gradually, and the inner homogeneous of plumb joint is provided with several the first cavitys, has air nozzle in the arranged outside of welding base.
As preferably, several the first spring leafs are coaxially arranged with in described first end, first spring leaf center is run through the first resonant rod, the two ends of the first resonant rod are separately fixed on ultrasonic transducer and pedestal, first resonant rod surface is provided with several the second spring leafs, second spring leaf is mutually vertical with the first spring leaf, and the first resonant rod is by the second spring leaf and the first spring leaf interference fit.
As preferably, three the second resonant rods are provided with in described the second end, second resonant rod with the first resonant rod for eccentric axial is symmetrical arranged, the two ends of the second resonant rod are fixed with pedestal and balance weight respectively, the outside of three the second resonant rods is socketed with the 3rd spring leaf, the both sides of the 3rd spring leaf are fixed with arc-shaped spring piece, and the outside of the second resonant rod is socketed with the first spring body.
As preferably, described balancing pole comprises shell, is provided with the second spring body in shell, and one end of the second spring body is fixed with the first rubber blanket, first rubber blanket and the first spring leaf contact with each other, and the other end of the second spring body is fixed on arc-shaped spring piece by rubber intermediate plate.
As preferably, described shell is provided with the first adjustment bolt, the bottom of the first adjustment bolt is fixed with the second rubber blanket, and the second rubber blanket crimps with the second spring body is selective under the drive of the first adjustment bolt.
As preferably, described balance weight comprises housing, is provided with some layers of elastic bumps portion in housing, selectively in elastic bumps portion is placed with balancing weight, and the top of housing is provided with the second adjustment bolt, and the second adjustment bolt is crimped on and is positioned on the balancing weight of the superiors.
As preferably, described housing bottom is provided with the 3rd spring body, and the top of the 3rd spring body is crimped on undermost balancing weight.
As preferably, the center of described plumb joint is provided with the second cavity, be provided with transverse slat below second cavity, arranged in a crossed manner between the top of transverse slat and the second cavity have two the 3rd resonant rods, and the ratio of distances constant of the distance of transverse slat and the second cavity floor and transverse slat and the second cavity end face is 1:4.
A welding method for the above-mentioned ultrasonic brazing unit for sheet metal, comprises the following steps:
A, the surface of welding position to be processed, remove oxide layer, weldment is placed on welding base;
B, hydraulic stem drive weld mold to move down, first soldering sleeve is made to contact with weldment, footprint pressure is 150MPa ~ 200MPa, the amplitude of plumb joint is 80 μm ~ 150 μm, and ultrasonic power is 0.5kW ~ 1.2kW, and weld interval is 5s ~ 15s, dwell time is greater than 3s ~ 5s weld interval, air nozzle sprays nitrogen to welding position, and nitrogen keeps room temperature, and injection flow velocity is 3m/s ~ 5m/s;
C, hydraulic stem continue to drive weld mold to move down, plumb joint is contacted with weldment, footprint pressure is 550MPa ~ 750MPa, the amplitude of plumb joint is 10 μm ~ 15 μm, and ultrasonic power is 2.0kW ~ 3.0kW, and weld interval is 20s ~ 30s, dwell time is greater than 3s ~ 5s weld interval, air nozzle sprays nitrogen to welding position, and nitrogen keeps room temperature, and injection flow velocity is 8m/s ~ 12m/s;
D, hydraulic stem drive weld mold upwards to promote, and air nozzle sprays nitrogen to welding position, and nitrogen keeps room temperature, and injection flow velocity is 25m/s ~ 30m/s, and weldment surface temperature terminates after being down to room temperature.
The beneficial effect adopting technique scheme to bring is: the present invention, by improving the structure of ultrasonic transformer, improves the control uniformity of weld mold amplitude, and improves the transmission efficiency of the vibration sent for ultrasonic transducer.First adjustment bolt and the second adjustment bolt can carry out selective filter adjustment to vibration, thus improve the concentration degree of amplitude.Weld mold is made up of two parts, and when welding, first soldering sleeve contacts with face of weld, tentatively welds, and then jointly completes weld job by plumb joint and soldering sleeve.Meanwhile add nitrogen protection and temperature control, the welding uniformity of weld can be improved, reduce the appearance of cavity and burr.When plumb joint contacts with face of weld, soldering sleeve generation extrusion pressing type becomes, and reduces with the contact area of plumb joint sidewall, the first cavity is reduced for the transmission of vibration, thus improves the vibration transmission quantity of plumb joint part.
Accompanying drawing explanation
Fig. 1 is the structure chart of the present invention's detailed description of the invention.
Fig. 2 is the structure chart of first end in the present invention's detailed description of the invention.
Fig. 3 is the structure chart of the second end in the present invention's detailed description of the invention.
Fig. 4 is the structure chart of balancing pole in the present invention's detailed description of the invention.
Fig. 5 is the structure chart of balance weight in the present invention's detailed description of the invention.
Fig. 6 is the structure chart of plumb joint in the present invention's detailed description of the invention.
In figure: 1, ultrasonic transducer; 2, base is welded; 3, first end; 4, the second end; 5, balance weight; 6, balancing pole; 7, hydraulic stem; 8, pedestal; 9, plumb joint; 10, soldering sleeve; 11, the first cavity; 12, air nozzle; 13, the first spring leaf; 14, the first resonant rod; 15, the second spring leaf; 16, the second resonant rod; 17, the 3rd spring leaf; 18, arc-shaped spring piece; 19, the first spring body; 20, shell; 21, the second spring body; 22, the first rubber blanket; 23, rubber intermediate plate; 24, the first adjustment bolt; 25, the second rubber blanket; 26, housing; 27, elastic bumps portion; 28, the second adjustment bolt; 29, the 3rd spring body; 30, the second cavity; 31, transverse slat; 32, the 3rd resonant rod; 33, balancing weight; 34, the first passage; 35, the second passage; 36, baffle plate; 37, trapezoidal contact end; 38, groove.
Detailed description of the invention
The standardized element used in the present invention all can be commercially, shaped piece all can carry out customized according to description with the record of accompanying drawing, the concrete connected mode of each part all adopts the conventional means such as bolt, rivet, welding, stickup ripe in prior art, is not described in detail in this.
With reference to Fig. 1-6, the present invention's detailed description of the invention comprises ultrasonic transducer 1, ultrasonic transformer and weld mold, welding base 2 is provided with below weld mold, hydraulic stem 7 is connected with above weld mold, described ultrasonic transformer comprises the first end 3 and the second end 4 that are separated and arrange, weld mold is fixed between first end 3 and the second end 4, first end 3 is fixed on ultrasonic transducer 1, the second end 4 is fixed with balance weight 5, between first end 3 and the second end 4, is connected with balancing pole 6; Weld mold comprises pedestal 8, pedestal 8 is fixed between first end 3 and the second end 4, plumb joint 9 is fixed with below pedestal 8, slide and be socketed with soldering sleeve 10 in the outside of plumb joint 9, the length of soldering sleeve 10 is greater than the length of plumb joint 9, the diameter of soldering sleeve 10 from top to bottom increases gradually, and the inner homogeneous of plumb joint 9 is provided with several the first cavitys 11, has air nozzle 12 in the arranged outside of welding base 2.Several the first spring leafs 13 are coaxially arranged with in first end 3, first spring leaf 13 center is run through the first resonant rod 14, the two ends of the first resonant rod 14 are separately fixed on ultrasonic transducer 1 and pedestal 8, first resonant rod 14 surface is provided with several the second spring leafs 15, second spring leaf 15 is mutually vertical with the first spring leaf 13, and the first resonant rod 14 is by the second spring leaf 15 and the first spring leaf 13 interference fit.Three the second resonant rods 16 are provided with in the second end 4, second resonant rod 16 with the first resonant rod 14 for eccentric axial is symmetrical arranged, the two ends of the second resonant rod 16 are fixed with pedestal 8 and balance weight 5 respectively, the outside of three the second resonant rods 16 is socketed with the 3rd spring leaf 17, the both sides of the 3rd spring leaf 17 are fixed with arc-shaped spring piece 18, and the outside of the second resonant rod 16 is socketed with the first spring body 19.Balancing pole 6 comprises shell 20, the second spring body 21 is provided with in shell 20, one end of second spring body 21 is fixed with the first rubber blanket 22, first rubber blanket 22 and the first spring leaf 13 contacts with each other, and the other end of the second spring body 21 is fixed on arc-shaped spring piece 18 by rubber intermediate plate 23.Bottom shell 20 being provided with the first adjustment bolt 24, first adjustment bolt 24 is fixed with the second rubber blanket 25, second rubber blanket 25 and crimps with the second spring body 21 is selective under the drive of the first adjustment bolt 24.Balance weight 5 comprises housing 26, some layers of elastic bumps portion 27 are provided with in housing 26, selectively in elastic bumps portion 27 be placed with balancing weight 33, the top of housing 26 is provided with the second adjustment bolt 28, second and adjusts bolt 28 and be crimped on and be positioned on the balancing weight 33 of the superiors.The top being provided with the 3rd spring body the 29, three spring body 29 bottom housing 26 is crimped on undermost balancing weight 33.The center of plumb joint 9 is provided with the second cavity 30, transverse slat 31 is provided with below second cavity 30, arranged in a crossed manner between transverse slat 31 and the top of the second cavity 30 have two the 3rd resonant rods 32, and the distance of transverse slat 31 and the second cavity 30 bottom surface and the ratio of distances constant of transverse slat 31 and the second cavity 30 end face are 1:4.One end welding base plate 2 being provided with several the first passage 34, first passages 34 is positioned at the sidewall of welding base plate 2, and the other end is positioned at the end face of welding base plate 2.Air nozzle 12 is positioned at the side of welding base plate 2, and other three sides of welding base plate 2 are respectively arranged with a baffle plate 36, baffle plate 36 with weld base plate and be coupling.Soldering sleeve 10 is in hyperboloid of one sheet shape, and the bottom of soldering sleeve 10 is provided with the second passage 35, second passage 35 and is horizontally disposed with.The bottom surface of plumb joint 9 is evenly provided with trapezoidal contact end 37, and the bottom surface of trapezoidal contact end 37 is provided with groove 38.
A welding method for the above-mentioned ultrasonic brazing unit for sheet metal, is in particular the welding method of welding the thick aluminium strip of 0.3mm ~ 0.5mm specially on stainless steel base, comprises the following steps:
A, the surface of welding position to be processed, remove oxide layer, weldment is placed on welding base 2;
B, hydraulic stem 7 drive weld mold to move down, first make soldering sleeve 10 contact with weldment, footprint pressure is 175MPa, and the amplitude of plumb joint is 100 μm, ultrasonic power is 1.1kW, weld interval is 11s, and the dwell time is greater than 5s weld interval, and air nozzle 12 sprays nitrogen to welding position, nitrogen keeps room temperature, injection flow velocity is 4.5m/s, and baffle plate 36 is tilted to outer setting, is 150 ° with the angle welding base plate 2;
C, hydraulic stem 7 continue to drive weld mold to move down, plumb joint 9 is contacted with weldment, footprint pressure is 710MPa, and the amplitude of plumb joint is 12 μm, and ultrasonic power is 2.3kW, weld interval is 25s, dwell time is greater than 5s weld interval, and air nozzle 12 sprays nitrogen to welding position, and nitrogen keeps room temperature, injection flow velocity is 11m/s, and baffle plate 36 still keeps telling somebody what one's real intentions are in step B; Hydraulic stem 7 reduces pressure, makes footprint pressure be reduced to 650MPa, and amplitude and the power of plumb joint 9 remain unchanged, and this state keeps 10s, and nitrogen jet speed is increased to 35m/s during this period, and baffle plate 36 is adjusted to weld base plate 2 mutually vertical;
D, hydraulic stem 7 drive weld mold upwards to promote, and air nozzle 12 sprays nitrogen to welding position, and nitrogen keeps room temperature, and injection flow velocity is 28m/s, and baffle plate 36 lies in a horizontal plane on welding base plate 2, and weldment surface temperature terminates after being down to room temperature.
Invention increases the precision that supersonic welding termination process controls for weld seam, the welding scrappage of weld seam can be reduced to 1 ‰ once by existing about 5 ‰.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.