CN103203510A - Brazing experimental device and method assisted by supersonic vibration and electric fields - Google Patents
Brazing experimental device and method assisted by supersonic vibration and electric fields Download PDFInfo
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- CN103203510A CN103203510A CN201310085597XA CN201310085597A CN103203510A CN 103203510 A CN103203510 A CN 103203510A CN 201310085597X A CN201310085597X A CN 201310085597XA CN 201310085597 A CN201310085597 A CN 201310085597A CN 103203510 A CN103203510 A CN 103203510A
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Abstract
The invention relates to a brazing experimental device and method assisted by supersonic vibration and electric fields. The brazing experimental device assisted by supersonic vibration and electric fields includes a heating system, a static electric field applying system and an ultrasonic wave load applying system; the static electric field applying system includes an static electric field power supply, an upper electrode plate, a lower electrode plate, and the upper surface of the lower electrode is provided with an insulation brazing working platform; the ultrasonic wave load applying system includes an ultrasonic wave generating system and an ultrasonic vibration transmission system; the ultrasonic wave generating system includes an ultrasonic wave generating power supply and a piezoelectric ceramic transducer; and the ultrasonic vibration transmission system includes a support, an ultrasonic wave transmission bar and a vibration pressure head, and the portion of the ultrasonic wave transmission bar, which extends between the upper electrode plate and the lower electrode plate, and the vibration pressure head are both made of insulating ceramics. The brazing experimental device enables experimental materials to be subjected to brazing experiments with the combined assist of the ultrasonic wave loads and the static electric field, and overcomes the limit of only applying the ultrasonic vibration or only applying the static electric field in improving the quality of brazing welding points.
Description
Technical field
The present invention relates to soldering experimental technique field, particularly auxiliary soldering experimental provision and the method for a kind of ultrasonic vibration and electric field.
Background technology
In electronic product, the soldering solder joint plays the important function of connecting circuit element and substrate.Along with electronic product to the developing rapidly of directions such as high power, high density, high reliability and multifunction and unleaded assembling, encapsulation, the q﹠r of unleaded solder joint is had higher requirement.In brazing process; relatively poor with closely-related fabrication weldability such as wetting, as to spread, solidify; regular meeting cause such as rosin joint, thick and interface roughness intermetallic compound (IMC) layer cracking, weld seam microsegregation, solder joint is peeled off weld defect such as peels off with pad, has a strong impact on quality of welding spot and reliability.Along with the process of the unleaded development of solder, show this defective day outstanding.In brazing process, wetability is the key factor that influences soldering quality of welding spot and reliability.At present, for reliability and the quality that improves soldering solder joint or joint, often realize by the method for improving solder wetting.The wetability of solder and liquid solder are sprawled the mother metal surface, and the mass transfer behavior of gas-liquid, solid-liquid interfacial tension and material interface is relevant.The wetability of lead-free brazing generally is lower than traditional SnPb solder, therefore, in the prior art usually by adopting measures such as deep-etching brazing flux and atmosphere protection to improve lead-free brazing wetting to obtain well behaved soldered fitting or solder joint to mother metal.But the soldering production cost height under the atmosphere protection, and brazing flux generally all has corrosivity, and soldering solder joint or joint are had adverse effect in the process under arms.In order to improve under the prerequisite of solder wetting in realization, reach few purpose of using, even not using solder flux in brazing process simultaneously, there is the auxiliary method for welding of external energy in the prior art, this method for welding can improve the wetability of solder.This method for welding has following two kinds: a kind of is that mother metal is applied ultrasonic vibration load, and another kind is to apply electrostatic field in the soldering position of solder and mother metal.
Use the prior art of the auxiliary method for welding of ultrasonic vibration load to disclose a kind of ultrasonic vibration liquid phase welding equipment as No. 200710071744.2 Chinese invention patents, this equipment comprises ultrasonic vibration charger and soldering heating thermal source.Studied the wetting joint filling process of ZnAl solder under frequency 20kHz, amplitude 10 μ m ultrasonic vibration load effects in the above-mentioned patent documentation; Studies show that ultrasonic vibration is propagated and can be produced cavitation, can abolish the oxide-film on mother metal surface whereby and promote liquid solder sprawling on the mother metal surface in liquid.But, apply ultrasonic vibration merely and can make liquid solder in wet processes, produce " subcutaneous undercurrent layer ", be unfavorable for that solder is fully wetting, the solder wetting degree is limited.Under the effect of ultrasonic vibration load, the big multipotency of the wetability of solder improves, but the improvement degree is limited.
The prior art of the method for welding that the use electrostatic field is auxiliary such as Lee mahatma of Xi'an University of Technology, Fan Zhikang have studied the electrostatic field influence wetting to Cu/W in " Rare Metals Materials and engineering " paper (thesis topic is " electric field and element Cr are to the influence of Cu/W wetability ") of 2007 the 36th the 6th phases of volume.This paper discloses the method for carrying out the solder wetting process under electrostatic field.Added electrostatic field can form contact potential and electric charge enrichment at the liquid-solid boundary place, thereby cause that solid liquid interface can reduce, and electrostatic field can promote the material interface mass transfer, is conducive to solder wetting, but the effect of single electrostatic field is also very limited to the improvement of solder wetting.
The method for welding that above-mentioned external energy is auxiliary no matter be single ultrasonic vibration load or the single electrostatic field that applies of applying, all only can improve the wetability of solder in limited range, can not significantly improve the q﹠r of soldering solder joint.In addition, singlely add the shortcoming that there is heating environment uniform temperature difference in the auxiliary soldering experimental provision of ultrasonic vibration load; The single auxiliary soldering experimental provision of electrostatic field that adds exists electrostatic field power supply kind single, can not carry out electrostatic field kind, polarity etc. to the shortcoming of the wetting sex experimental study in the brazing process.All there is the drawback of soldering experimental provision secondary development difference in these two kinds of methods.
Summary of the invention
The object of the present invention is to provide the auxiliary soldering experimental technique of a kind of ultrasonic vibration and electric field, so that brazing process carries out under the common booster action of ultrasonic vibration load and electrostatic field.The present invention also provides a kind of device of implementing the auxiliary soldering experimental technique of above-mentioned ultrasonic vibration and electric field that is exclusively used in.
To achieve these goals, the auxiliary soldering experimental technique of ultrasonic vibration of the present invention and electric field adopts following technical scheme.The soldering experimental technique that a kind of ultrasonic vibration and electric field are auxiliary may further comprise the steps:
A) prepare before the weldering:
A) preparation of experiment material: 1) process step-like bridging arrangement at the used mother metal of soldering, with sand paper or equipment for grinding with the welding surface of mother metal polish flat, bright and clean, and clean with acetone or alcohol, dry or to dry up the back standby; 2) solder is laminated shape; 3) solder is placed between the faying surface of upper and lower correspondence of bridging arrangement of two mother metals, the bridging arrangement make-up of two mother metals is overlapped;
B) debugging of welding equipment: 1) electrostatic field power supply, ultrasonic wave generation power supply are inserted the alternating current of 220V; 2) close ultrasonic wave generation power supply after setting up required ultrasonic vibration power, treat to open when experiment needs; 3) close the electrostatic field power supply behind the electrostatic field kind of setting needs, polarity, the voltage, treat to open when experiment needs;
B) brazing process: experiment material is positioned on the electric pole plate of electrostatic field application system and the insulation soldering workbench between the lower electrode plate, the ultrasonic wave that will be connected with the ultrasonic vibration source of setpoint frequency transmits bar and stretches in the described electrostatic field, and transmit by ultrasonic wave that fixedly connected vibration pressure head applies ultrasonic wave load to experiment material on the bar, the experiment material that is in the electrostatic field is heated to design temperature, make the solder fusing, two mother metals that overlap joint is arranged link together.
The auxiliary soldering experimental technique of ultrasonic vibration of the present invention and electric field also comprises the after welding treatment step: after step B finishes, use in time that discharging rod bleeds off on electric pole plate or the lower electrode plate, the static of electrostatic field power output end; Open the heating fire door, take off the vibration pressure head, take out experiment material.
The auxiliary soldering experimental technique of ultrasonic vibration of the present invention and electric field can make experiment material carry out the soldering experimentation under common the assisting of ultrasonic vibration load and electrostatic field, overcome and singlely in the prior art applied ultrasonic vibration or the single electrostatic field that applies (can't be realized oscillating load and electrostatic field acting in conjunction in existing limitation aspect the q﹠r that improves the soldering solder joint, it is single that to add ultrasonic vibration apparatus heating environment uniform temperature poor, single to add static field device electrostatic field power supply kind single, and all there are deficiencies such as experimental provision secondary development difference in both).The auxiliary soldering experimental technique of ultrasonic vibration of the present invention and electric field has been expanded few usefulness, has not even been studied with the soldering tech of brazing flux, both can be used for the brazing process of research experiment material under the compound action of ultrasonic vibration load and electrostatic field, can be used for developmental research soldering new technology, new technology again.
Further, the auxiliary soldering experimental technique of ultrasonic vibration of the present invention and electric field has the after welding treatment step, and the use discharging rod in time bleeds off the static of electric pole plate, lower electrode plate and electrostatic field power output end, has improved the security performance of this method.
The auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field adopts following technical scheme: the soldering experimental provision that a kind of ultrasonic vibration and electric field are auxiliary, comprise the heating system that is used to experiment material that the soldering thermal source is provided, be used for to experiment material apply electrostatic field the electrostatic field application system, be used for experiment material is applied the ultrasonic wave load application system of ultrasonic wave load; Described electrostatic field application system comprises electrostatic field power supply, the electric pole plate and the lower electrode plate that are electrically connected with the electrostatic field power supply, the upper surface of described lower electrode plate is provided with for the insulation soldering workbench of placing experiment material, and the table top of insulation soldering workbench is for the plane of placing experiment material; Ultrasonic wave load application system comprises the ultrasonic vibration transmission system that the ultrasonic wave of ultrasonic vibration source generation systems is provided and ultrasonic vibration is passed to experiment material; Described ultrasonic wave generation systems comprises ultrasonic wave generation power supply, the piezoelectric ceramic transducer that is connected with ultrasonic wave generation power supply, the ultrasonic vibration transmission system comprises support, be connected with the hinged swing of support or the ultrasonic wave that is used for stretching between described electric pole plate and the lower electrode plate that elastics wing connects transmits bar, be fixedly arranged on the vibration pressure head that is used for compressing experiment material on the ultrasonic wave transmission bar, described piezoelectric ceramic transducer is fixed in ultrasonic wave and transmits on the bar, and described ultrasonic wave transmits bar and stretches into part between electric pole plate and the lower electrode plate and vibration pressure head and all adopt and can prevent from causing the insulating ceramics of shielding to make to electrostatic field.
Heating system comprises the heating furnace that is used to experiment material that the soldering thermal source is provided, be located at thermocouple in the heating furnace, be located at heating furnace outer is connected with thermocouple be used for monitoring and control the temperature control instrument of the ambient temperature of experiment material, described electric pole plate and lower electrode plate are arranged in the heating furnace, described ultrasonic wave transmits bar one end and stretches out outside the heating furnace, and described ultrasonic wave generation power supply is located at outside the heating furnace.
Also comprise experiment porch, described electric pole plate and lower electrode plate support by insulator respectively and place on the experiment porch, the insulator that supports electric pole plate is insulated column, the insulator that supports lower electrode plate is insulation board, described insulation soldering workbench, insulation board are made by having high-intensity silicon nitride ceramics, and insulation soldering workbench and insulation board are disc.
Spacing between electric pole plate and the lower electrode plate is not less than 3cm, and the electrostatic field intensity scope between electric pole plate and the lower electrode plate is 0～6.6 kV/cm.
Described ultrasonic wave transmits assembling pressurization counterweight on the bar.
Described electrostatic field power supply is the electrostatic field power supply that positive direct-current high pressure, negative dc high voltage, ac high-voltage and the high voltage pulse of 0～20kV can be provided, the electrostatic field power supply has positive direct-current high-voltage output end, negative dc high voltage output, ac high-voltage output, positive direct-current high voltage pulse output and earth terminal, and any two in the positive direct-current high-voltage output end of electrostatic field power supply, negative dc high voltage output, ac high-voltage output, positive direct-current high voltage pulse output and the earth terminal are connected with the contact conductor of electric pole plate and lower electrode plate respectively.
Described ultrasonic wave generation systems also comprises for the amplitude transformer that amplifies amplitude, described piezoelectric ceramic transducer is connected with amplitude transformer and is combined into assembly and together is fixed on ultrasonic wave and transmits on the bar, and described ultrasonic wave generation power supply has the vibration frequency of oscillation power and the 20～40kHz of 0～300W.
Described support comprises sliding rail and with the described ultrasonic wave transmission bar hinged sliding sleeve of guiding slidable fit on sliding rail of above-below direction guiding, the amplitude transformer of described ultrasonic wave generation systems is fixed in the top that ultrasonic wave transmits close support one end of bar by screw, and the amplitude transformer direction of vibration is vertical with the length bearing of trend that ultrasonic wave transmits bar.
Adopt the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field can make experiment material under common the assisting of ultrasonic vibration load and electrostatic field, carry out the soldering experimentation, overcome and singlely in the prior art applied ultrasonic vibration or the single electrostatic field that applies (can't be realized oscillating load and electrostatic field acting in conjunction in existing limitation aspect the q﹠r that improves the soldering solder joint, it is single that to add ultrasonic vibration apparatus heating environment uniform temperature poor, single to add static field device electrostatic field power supply kind single, and all there are deficiencies such as experimental provision secondary development difference in both).Part and vibration pressure head that ultrasonic wave transmission bar stretches between electric pole plate and the lower electrode plate all adopt insulating ceramics to make, and can prevent from electrostatic field is caused shielding.The auxiliary brazing device of ultrasonic vibration of the present invention and electric field has characteristics multiple functional, safe and reliable, easy to use.The auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field has been expanded few usefulness, has not even been studied with the soldering tech of brazing flux, both can be used for the brazing process of research experiment material under the compound action of ultrasonic vibration load and electrostatic field, can be used for developmental research soldering new technology, new technology again.
Further, heating system comprises heating furnace, thermocouple and temperature controller, can conveniently monitor and control the ambient temperature of experiment material.
Further, the spacing between electric pole plate and the lower electrode plate is not less than 3cm, can make in the experimentation electrostatic field intensity evenly, change little.
Further, the electrostatic field power supply has positive direct-current high-voltage output end, negative dc high voltage output, ac high-voltage output, positive direct-current high voltage pulse output and earth terminal, can make the dissimilar electrostatic field of generation between electric pole plate and the lower electrode plate.
Description of drawings
Fig. 1 is the use state diagram of a kind of embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field;
Fig. 2 is the structural representation of ultrasonic wave load application system among Fig. 1;
Fig. 3 is the structural representation of electrostatic field application system among Fig. 1;
Fig. 4 is the structural representation of heating system among Fig. 1;
Fig. 5 is the structural representation of experiment material among Fig. 1;
Fig. 6 is the structural representation of mother metal among Fig. 5.
The specific embodiment
A kind of embodiment of the soldering experimental provision that ultrasonic vibration of the present invention and electric field are auxiliary, shown in Fig. 1～6: this device comprises for the heating system that experiment material 2 is provided the soldering thermal source, for the electrostatic field application system that experiment material 2 is applied electrostatic field, for the ultrasonic wave load application system that experiment material 2 is applied ultrasonic vibration load.
Heating system comprise have rectangular build inner chamber be used for to experiment material 2 provide the soldering thermal source heating furnace 20, place thermocouple 21 in the heating furnace 20, be located at the temperature control instruments 22 of heating furnace 20 ambient temperatures that are used for monitoring and control experiment material 2 outer and thermocouple 21 control connections.Heating furnace 20 adopts the 220V AC-powered, is subjected to the control of temperature control instrument 22, and the operating temperature range of heating furnace 20 is room temperature to 1000 ℃.Also be provided with experiment porch 3 in the heating furnace 20.
Ultrasonic wave load application system comprises the ultrasonic vibration transmission system 5 that the ultrasonic wave of ultrasonic vibration source generation systems 1 is provided and ultrasonic vibration is passed to experiment material 2.Ultrasonic wave generation systems 1 comprises ultrasonic wave generation power supply 40, the piezoelectric ceramic transducer that is electrically connected with ultrasonic wave generation power supply 40, be connected the amplitude transformer that constitutes assembly 41 with piezoelectric ceramic transducer, piezoelectric ceramic transducer and amplitude transformer are combined during fabrication and are constituted assembly 41, and ultrasonic vibration transmission system 5 comprises support, one end and support swing up and down the ultrasonic wave that the hinged and other end is arranged between electric pole plate 30 and the lower electrode plate 31 and transmit bar 50, be fixedly arranged on ultrasonic wave transmit bar 50 and be arranged in electric pole plate 30 with lower electrode plate 31 between an end down for the vibration pressure head 51 that compresses experiment material 2.Support comprises that the sliding rail 53 of above-below direction guiding and slidable fit transmit the hinged sliding sleeve 52 of bar 50 with ultrasonic wave on sliding rail 53.Ultrasonic wave generation systems 1 is fixed in the top that ultrasonic wave transmits close support one end of bar 50 by the assembly 41 that piezoelectric ceramic transducer and amplitude transformer constitute by screw, and the amplitude transformer direction of vibration is vertical with the length bearing of trend that ultrasonic wave transmits bar 50.Between assembly 41 and the vibration pressure head 51 pressurization counterweight 55 is housed on the ultrasonic wave transmission bar 50, pressurization counterweight 55 is counterweight.Sliding rail 53 is fixedly arranged on the base 54 of along continuous straight runs extension by welding.Amplitude transformer is the taper amplitude transformer, amplitude transformer is made by the TC4 titanium alloy, piezoelectric ceramic transducer is converted into the ultrasonic vibratory energy form by lead with the signal of telecommunication that ultrasonic wave generation power supply 40 provides, and amplitude transformer can play the effect that the amplitude that ultrasonic wave generation power supply 40 is provided amplifies 2 times.Vibration pressure head 51 transmits bar 50 by high-temp glue and ultrasonic wave fixedlys connected.Ultrasonic wave transmits the part of bar 50 and makes with the TC4 titanium alloy.Ultrasonic wave transmits bar 50 and stretches into the part between electric pole plate 30 and the lower electrode plate 31 and vibrate pressure head 51 and all adopt and can prevent from causing the insulating ceramics of shielding to make to electrostatic field.In the present embodiment, the part that ultrasonic wave transmission bar 50 stretches between electric pole plate 30 and the lower electrode plate 31 is made by silicon carbide ceramics, and vibration pressure head 51 usefulness silicon nitride ceramics are made.Ultrasonic vibration is transmitted bar 50 from ultrasonic wave generation power supply 40 by ultrasonic wave and is passed to experiment material 2, the ultrasonic vibration power 0～300W of generation, and vibration frequency is 20～40kHz.
In addition, also comprise the discharging rod that in time bleeds off the static of electric pole plate, lower electrode plate and electrostatic field power output end after finishing for work among other embodiment of the soldering experimental provision that ultrasonic vibration of the present invention and electric field are auxiliary, discharging rod is made up of high voltage withstanding big resistance and lead, the earth terminal of one termination electrostatic field power supply, the other end and contact conductor contact discharge during use.
The electrostatic field power supply can also be selected other voltage range and each output of electrostatic field power supply and the different connections of electric pole plate and lower electrode plate accordingly in other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field.For example: electric pole plate, lower electrode plate connect negative dc high voltage output, positive direct-current high-voltage output end respectively, and output voltage range is 0～20kV; Perhaps electric pole plate, lower electrode plate connect earth terminal, positive direct-current high-voltage output end respectively, and output voltage range is 0～10kV; Perhaps electric pole plate, lower electrode plate connect positive direct-current high-voltage output end, negative dc high voltage output respectively, and output voltage is 0～20kV; Perhaps electric pole plate, lower electrode plate connect positive direct-current high voltage pulse output, negative dc high voltage output respectively, and output voltage is 0～20kV; Perhaps electric pole plate, lower electrode plate connect earth terminal, negative dc high voltage output respectively, and output voltage is 0～10kV; Perhaps electric pole plate, lower electrode plate connect earth terminal, ac high-voltage output respectively, and output voltage is 0～10kV; Perhaps electric pole plate, lower electrode plate connect negative dc high voltage output, positive direct-current high voltage pulse output respectively, and output voltage is 0～20kV; Perhaps electric pole plate, lower electrode plate connect earth terminal, positive direct-current high voltage pulse output respectively, and output voltage is 0～10kV; Perhaps electric pole plate, lower electrode plate connect positive direct-current high-voltage output end, earth terminal respectively, and output voltage is 0～10kV; Perhaps electric pole plate, lower electrode plate connect ac high-voltage output, earth terminal respectively, and output voltage is 0～10kV; Perhaps electric pole plate, lower electrode plate connect positive direct-current high voltage pulse output, earth terminal respectively, and output voltage is 0～10kV.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, the spacing between electric pole plate and the lower electrode plate can be 3～6cm.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, can also adopt other thermal source in the heating system, as high-frequency induction heating, be specially and pass through coil heats.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, experiment material environment electrostatic field intensity of living in can be 0～6.6kV/cm.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, when only using piezoelectric ceramic transducer just can meet the demands, ultrasonic wave load application system also can save amplitude transformer and only comprise ultrasonic wave generation power supply and piezoelectric ceramic transducer.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, contact conductor can also be made with Pt-Rh wire.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, insulating sleeve can also be made with aluminium oxide ceramics.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, insulated column can also be made with quartz glass or aluminium oxide ceramics.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, insulation soldering workbench and insulation board can adopt aluminium oxide ceramics to make.
In other embodiment of the auxiliary soldering experimental provision of ultrasonic vibration of the present invention and electric field, contact conductor one end can also directly be tightened on the binding post, or the direct suit of an end of contact conductor is tightened on electric pole plate and the lower electrode plate.
A kind of embodiment of the soldering experimental technique that ultrasonic vibration of the present invention and electric field are auxiliary is to use the embodiment of the auxiliary soldering experimental provision of above-mentioned ultrasonic vibration and electric field to carry out, and this method may further comprise the steps:
A) prepare before the weldering:
A) preparation of experiment material: 1) process step-like bridging arrangement at the used mother metal of soldering, with sand paper or equipment for grinding with the welding surface of mother metal polish flat, bright and clean, and clean with acetone or alcohol, dry or to dry up the back standby; 2) solder is laminated shape; 3) solder is placed between the faying surface of upper and lower correspondence of bridging arrangement of two mother metals, the bridging arrangement make-up of two mother metals is overlapped;
B) debugging of welding equipment: 1) electrostatic field power supply, ultrasonic wave generation power supply are inserted the 220V alternating current; 2) close ultrasonic wave generation power supply after setting up required ultrasonic vibration power, treat to open when experiment needs; 3) close the electrostatic field power supply behind the electrostatic field kind of setting needs, polarity, the voltage, treat to open when experiment needs.
B) brazing process: experiment material is positioned between the electric pole plate and lower electrode plate of electrostatic field application system, the ultrasonic wave that will be connected with the ultrasonic vibration source of setpoint frequency transmits bar and stretches in the electrostatic field, and transmit by ultrasonic wave that fixedly connected vibration pressure head applies ultrasonic wave load to experiment material on the bar, the experiment material that is in the electrostatic field is heated to design temperature, make the solder fusing, two mother metals that overlap joint is arranged link together.
C) after welding treatment: after heating is finished, in time use discharging rod to bleed off the static that reaches the electrostatic field power output end on electric pole plate, the lower electrode plate; Open the heating fire door, take off the vibration pressure head, take out experiment material.
The another kind of specific embodiment of the soldering experimental technique that ultrasonic vibration of the present invention and electric field are auxiliary may further comprise the steps:
A) prepare before the weldering:
A) preparation of experiment material: 1) select for use have step-like bridging arrangement copper coin as mother metal, and with the welding surface of 400#～800# sand papering mother metal, soak, clean with acetone, it is standby to dry the back; 2) the Sn2.5Ag0.7Cu0.1RE solder is made the thin slice of 10 * 12 * 0.1mm, soaked, clean with acetone, it is standby to dry the back; 3) solder is placed between the faying surface of upper and lower correspondence of bridging arrangement of two mother metals, the bridging arrangement make-up of two mother metals is overlapped, solder respectively drip 1～2 commercially available commercial washing brazing flux up and down;
B) debugging of welding equipment: 1) electrostatic field power supply, ultrasonic wave generation power supply insert the 220V alternating current; 2) after the required ultrasonic vibration power of setting is 88W, close ultrasonic wave generation power supply, treat to open when experiment needs; 3) take lower electrode plate to connect the connection of electrostatic field power supply positive direct-current high-voltage output end, electric pole plate earth connection, set up electrostatic field voltage, make the field intensity of electrostatic field reach 1.5kV/cm after, close the electrostatic field power supply, treat to open when experiment needs.
B) brazing process: after heating furnace energising heating reaches 270 ℃, open the heating fire door, experiment material is placed in the heating furnace on the insulation soldering workbench above the lower electrode plate, will the vibration pressure head be pressed in the edge of mother metal, closed heating fire door; After furnace temperature to be heated reaches 270 ℃ again, transmit the bar middle part at ultrasonic wave and apply the counterweight counterweight, sample is applied 1.3MPa pressure, apply the ultrasonic vibration of power 88W, frequency 20kHz and the electrostatic field of field intensity 1.5kV/cm simultaneously, beginning soldering and timing.
C) after welding treatment: close ultrasonic wave generation power supply when soldering begins 45 seconds, stop to apply ultrasonic vibration; Close the electrostatic field power supply in the time of 60 seconds, and bleed off the residual statics of electric pole plate and lower electrode plate and electrostatic field power supply inside with discharging rod; Take off the counterweight counterweight in the time of 120 seconds, open the heating fire door, take out experiment material.
D) detect the soldered fitting shear strength: after treating the experiment material cooling, with the shear strength of tension gage measurement soldered fitting, testing result is shear strength 29.5MPa.
In other embodiment of the auxiliary soldering experimental technique of ultrasonic vibration of the present invention and electric field, can omit the after welding treatment step.
Claims (10)
1. the auxiliary soldering experimental technique of a ultrasonic vibration and electric field is characterized in that, may further comprise the steps:
A) prepare before the weldering:
A) preparation of experiment material: 1) process step-like bridging arrangement at the used mother metal of soldering, with sand paper or equipment for grinding with the welding surface of mother metal polish flat, bright and clean, and clean with acetone or alcohol, dry or to dry up the back standby; 2) solder is laminated shape; 3) solder is placed between the faying surface of upper and lower correspondence of bridging arrangement of two mother metals, the bridging arrangement make-up of two mother metals is overlapped;
B) debugging of welding equipment: 1) electrostatic field power supply, ultrasonic wave generation power supply are inserted the alternating current of 220V; 2) close ultrasonic wave generation power supply after setting up required ultrasonic vibration power, treat to open when experiment needs; 3) close the electrostatic field power supply behind the electrostatic field kind of setting needs, polarity, the voltage, treat to open when experiment needs;
B) brazing process: experiment material is positioned on the electric pole plate of electrostatic field application system and the insulation soldering workbench between the lower electrode plate, the ultrasonic wave that will be connected with the ultrasonic vibration source of setpoint frequency transmits bar and stretches in the described electrostatic field, and transmit by ultrasonic wave that fixedly connected vibration pressure head applies ultrasonic wave load to experiment material on the bar, the experiment material that is in the electrostatic field is heated to design temperature, make the solder fusing, two mother metals that overlap joint is arranged link together.
2. the auxiliary soldering experimental technique of ultrasonic vibration according to claim 1 and electric field, it is characterized in that, also comprise the after welding treatment step: after step B finishes, in time use discharging rod to bleed off the static that reaches the electrostatic field power output end on electric pole plate, the lower electrode plate; Open the heating fire door, take off the vibration pressure head, take out experiment material.
3. ultrasonic vibration and auxiliary soldering experimental provision of electric field that is exclusively used in the method according to claim 1 implemented, it is characterized in that, comprise the heating system that is used to experiment material that the soldering thermal source is provided, be used for to experiment material apply electrostatic field the electrostatic field application system, be used for experiment material is applied the ultrasonic wave load application system of ultrasonic wave load; Described electrostatic field application system comprises electrostatic field power supply, the electric pole plate and the lower electrode plate that are electrically connected with the electrostatic field power supply, the upper surface of described lower electrode plate is provided with for the insulation soldering workbench of placing experiment material, and the table top of insulation soldering workbench is for the plane of placing experiment material; Ultrasonic wave load application system comprises the ultrasonic vibration transmission system that the ultrasonic wave of ultrasonic vibration source generation systems is provided and ultrasonic vibration is passed to experiment material; Described ultrasonic wave generation systems comprises ultrasonic wave generation power supply, the piezoelectric ceramic transducer that is connected with ultrasonic wave generation power supply, the ultrasonic vibration transmission system comprises support, be connected with the hinged swing of support or the ultrasonic wave that is used for stretching between described electric pole plate and the lower electrode plate that elastics wing connects transmits bar, be fixedly arranged on the vibration pressure head that is used for compressing experiment material on the ultrasonic wave transmission bar, described piezoelectric ceramic transducer is fixed in ultrasonic wave and transmits on the bar, and described ultrasonic wave transmits bar and stretches into part between electric pole plate and the lower electrode plate and vibration pressure head and all adopt and can prevent from causing the insulating ceramics of shielding to make to electrostatic field.
4. the auxiliary soldering experimental provision of ultrasonic vibration according to claim 3 and electric field, it is characterized in that, heating system comprises the heating furnace that is used to experiment material that the soldering thermal source is provided, be located at thermocouple in the heating furnace, be located at heating furnace outer is connected with thermocouple be used for monitoring and control the temperature control instrument of the ambient temperature of experiment material, described electric pole plate and lower electrode plate are arranged in the heating furnace, described ultrasonic wave transmits bar one end and stretches out outside the heating furnace, and described ultrasonic wave generation power supply is located at outside the heating furnace.
5. the auxiliary soldering experimental provision of ultrasonic vibration according to claim 3 and electric field, it is characterized in that, also comprise experiment porch, described electric pole plate and lower electrode plate support by insulator respectively and place on the experiment porch, the insulator that supports electric pole plate is insulated column, the insulator that supports lower electrode plate is insulation board, and described insulation soldering workbench, insulation board are made by having high-intensity silicon nitride ceramics, and insulation soldering workbench and insulation board are disc.
6. the auxiliary soldering experimental provision of ultrasonic vibration according to claim 3 and electric field is characterized in that the spacing between electric pole plate and the lower electrode plate is not less than 3cm, and the electrostatic field intensity scope between electric pole plate and the lower electrode plate is 0～6.6 kV/cm.
7. the auxiliary soldering experimental provision of ultrasonic vibration according to claim 3 and electric field is characterized in that, described ultrasonic wave transmits assembling pressurization counterweight on the bar.
8. the auxiliary soldering experimental provision of ultrasonic vibration according to claim 3 and electric field, it is characterized in that, described electrostatic field power supply is the positive direct-current high pressure that 0～20kV can be provided, negative dc high voltage, the electrostatic field power supply of ac high-voltage and high voltage pulse, the electrostatic field power supply has the positive direct-current high-voltage output end, the negative dc high voltage output, the ac high-voltage output, positive direct-current high voltage pulse output and earth terminal, the positive direct-current high-voltage output end of electrostatic field power supply, the negative dc high voltage output, the ac high-voltage output, any two in positive direct-current high voltage pulse output and the earth terminal are connected with the contact conductor of electric pole plate and lower electrode plate respectively.
9. the soldering experimental provision auxiliary according to any described ultrasonic vibration and electric field in the claim 3～8, it is characterized in that, described ultrasonic wave generation systems also comprises for the amplitude transformer that amplifies amplitude, described piezoelectric ceramic transducer is connected with amplitude transformer and is combined into assembly and together is fixed on ultrasonic wave and transmits on the bar, and described ultrasonic wave generation power supply has the vibration frequency of oscillation power and the 20～40kHz of 0～300W.
10. the auxiliary soldering experimental provision of ultrasonic vibration according to claim 9 and electric field, it is characterized in that: described support comprises sliding rail and with the described ultrasonic wave transmission bar hinged sliding sleeve of guiding slidable fit on sliding rail of above-below direction guiding, the amplitude transformer of described ultrasonic wave generation systems is fixed in the top that ultrasonic wave transmits close support one end of bar by screw, and the amplitude transformer direction of vibration is vertical with the length bearing of trend that ultrasonic wave transmits bar.
Priority Applications (1)
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Application publication date: 20130717 Assignee: Luoyang Lei Jia Electronic Technology Co., Ltd. Assignor: Henan University of Science and Technology Contract record no.: X2019980000344 Denomination of invention: Brazing experimental device and method assisted by supersonic vibration and electric fields Granted publication date: 20150617 License type: Common License Record date: 20191111 |