CN1272137C - Resistive welder for coated wire - Google Patents
Resistive welder for coated wire Download PDFInfo
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- CN1272137C CN1272137C CN 02118537 CN02118537A CN1272137C CN 1272137 C CN1272137 C CN 1272137C CN 02118537 CN02118537 CN 02118537 CN 02118537 A CN02118537 A CN 02118537A CN 1272137 C CN1272137 C CN 1272137C
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Abstract
A resistance welding device for a covered wire is capable of well binding a plurality of covered wires in high efficiency. The resistance welding device has a welding head part and a welding power source. The welding head part is provided with an upper electrode, a lower electrode, and a pressurizing part. AC supply voltage with Commercial frequency from three phase alternating current supply terminals is input to the welding power source and is changed to direct voltage or alternating voltage for welding, and the main current supplied to the conducting channel of the welding head part by a pair of output terminals. Two covered wires which are mutual vertically overlapped are clamped from the upper side and the lower side by the upper electrode and the lower electrode and are brought into pressing contact by the pressure from the pressing part. The upper electrode has the shape of rough U or V, the upper end parts of branch parts forming a pair of right and left are made electrode terminals, and the lower end connecting part of the branch parts is made an electrode front end part to be pressurized and brought into contact with covered wires. The lower electrode has the shape of reversed rough U or V, the lower end parts of branch parts forming a pair of right and left are made electrode terminals, and the upper end connecting part of the branch parts is made an electrode front end part to be pressurized and brought into contact with covered wires.
Description
Technical field
The present invention relates to a plurality of covered wires are used each other the resistive welder for coated wire of method for resistance welding combination.
Background technology
Covered wire is meant the electric wire that conductor is coated with dielectric films such as polyimides, polyamidoimide, polyurethane, coating material or ethene.Now, during with the welding of two covered wires, not needing it is done chemistry or pre-treatment mechanically earlier, only is that the welder that the method for resistance welded is used the covered wire of its combination is on record with switching on.This welder is to add a target between upper electrode on the plumb joint and workpiece (covered wire), and concerning lower electrode, this target forms a bypass resistance.
According to this structure, at the energising initial stage, because the dielectric film of covered wire stops electric current to flow, electric current is then by upper electrode and target and lower electrode formation bypass resistance.So upper electrode and target (particularly two interelectrode contact portions) can generate heat because of Joule heat, and the heating covered wire, the dielectric film with covered wire melts at last, and the conductor or the bundle conductor of the inside are exposed.And after the conductor in the covered wire exposed, workpiece (covered wire) self had just formed a conducting channel, and electric current is just mobile between upper electrode and lower electrode.By connecting the electric current that workpiece flows, the contact portion of workpiece promptly will be owing to the Joule heat fusion weld of generating heat is integral between the conductor of two covered wires.So only will automatically the dielectric film on the covered wire be removed, the conductor in two covered wires is welded to each other together in energising on the plumb joint.
As mentioned above, in existing resistive welder for coated wire, be used for target correctly and firmly is installed in electrode structure complexity on the upper electrode, not only cost an arm and a leg, also have the bad problem of weldability.That is: be subjected to directly heating (Joule heat) fusing as the dielectric film that is positioned at top covered wire in two covered wires of workpiece by upper electrode and target, but the dielectric film that is positioned at following covered wire is owing to the heating that can not get from lower electrode, so be difficult to molten.Strengthen the heating of upper electrode and target if the dielectric film of following covered wire also is heated, the dielectric film that occurs the upside covered wire sometimes melted the phenomenon that fast burn falls, and made welding quality bad.Therefore, be to adopt when the dielectric film of upside covered wire has melted, to stop after energising and the pressurization two covered wires being changed upper-lower positions in the welding practical operation, pressurize once more, switch on, make the dielectric film fusing of another covered wire, and make the flow through conductor of two covered wires of welding current.But the operation of the upper and lower counter-rotating of two covered wires that the method must bother very much, and need a lot of operation and time, productivity is bad, does not deal with problems at all.
Summary of the invention
The present invention considers the prior art problems place, its purpose be to provide a kind of can be efficiently and the resistive welder for coated wire that welds together well with a plurality of covered wires.
Another object of the present invention is to carve in due course the current switching that the dielectric film of removing covered wire will be provided becomes the electric current that is used to weld the covered wire conductor.
A further object of the present invention is, improves the stability of the electrode heating of fusion covered wire dielectric film.
Another purpose of the present invention is that the electric current supply efficient and the welding quality of the main energising behind the covered wire dielectric film removed in raising.
For reaching above purpose, resistive welder for coated wire of the present invention is overlapping with a plurality of covered wires, with resistance welded with its combination, comprising: first electrode, it is by having electric conductivity and high febrifacient material is made, and have first, second terminal, the electrode leading section between described first, second terminal contacts with a side covered wire with the pressure of regulation; Second electrode, it is by having electric conductivity and high febrifacient material is made, and has the 3rd, the 4th terminal, second terminal of described the 3rd terminal and described first electrode is electrically connected,, contact with the opposing party's covered wire from the opposite side of described first electrode with the described the 3rd, the 4th interelectrode electrode leading section with the pressure of stipulating; Power circuit, its first lead-out terminal that is electrically connected with the first terminal of described first electrode and second lead-out terminal that is electrically connected with the 4th terminal of described second electrode constitute, and supply with principal current in the circuit between described first and second lead-out terminal.
In described structure, when the circuit of power circuit between first and second lead-out terminal supplied principal current, the energising initial stage was because the dielectric film of two covered wires stops main current flow, so electric current vertically flows two electrodes are become the serial connection mode.Promptly flow into the electric current of the first terminal of first electrode from first lead-out terminal of power circuit, the electrode leading section of first electrode of flowing through flows out from second terminal, enter the 3rd terminal of second electrode, the flow through electrode leading section of second electrode flows back to second lead-out terminal of power circuit again from the 4th terminal.Like this, just produced Joule heat near the electrode leading section of two electrodes, just be heated simultaneously up and down with the dielectric film of these Joule heat two covered wires.
By heating simultaneously up and down, the dielectric film of two covered wires is fusing simultaneously almost, after conductor exposes separately, the conduction road of the two covered wire conductors that between first and second electrode, provide, flow into major part the electric current of the first electrode the first terminal just no longer flow through second terminal of first electrode and the 3rd terminal of second electrode from first lead-out terminal of power circuit, but flow into the electrode leading section of second electrode across the conductor of two covered wires from the electrode leading section of first electrode, flow back to second lead-out terminal of power circuit from the 4th terminal of second electrode.Like this, the electric current that resistance welded is used just efficiently, has stably been supplied with two interelectrode welded parts (covered wire), between the conductor of two covered wires just securely, soldered in high quality.
The desirable form of resistive welder for coated wire of the present invention is to have the rated current of energy monitor flows through described power circuit or described first, second electrode, presents the in good time condition switching device shifter that switches energising or pressurized conditions of the moment that regulation changes by described electric current.
A desirable form of described condition switching device shifter is, can present the moment that regulation changes by described electric current, action in good time, the current setting value of switching principal current.Another desirable form is to have and presents the moment that regulation changes by described electric current and move in good time, will switch to the setting-up time that is used for the mutual welding of described covered wire conductor later conduction time.Perhaps, also can present the moment that regulation changes and move in good time, switch the size of the pressure that puts on covered wire by described electric current.
The desirable form of described condition switching device shifter also is to have first current-flow test set, and it measures the streaming current between the 3rd terminal of second terminal of first electrode and second electrode; First current monitor, it monitors the current value that described first current-flow test set is measured, the current value ratio regulation monitoring value that detects described electric current is constantly low.
Perhaps, described condition switching device shifter also can have second current-flow test set, and it measures principal current; Second current monitor, it monitors the fluctuation of the described principal current of being measured by described second current-flow test set, and detects the moment of the fluctuation overshoot monitoring value of described principal current.
A desirable form of the power circuit of resistive welder for coated wire of the present invention is, comprising: rectification circuit, and it can convert the commercial frequency alternating voltage to DC voltage; Converter, it can become high-frequency pulse voltage with the dc voltage conversion from described rectification circuit output; Welding transformer, the two ends of its primary coil are electrically connected with the lead-out terminal of described converter, the two ends of secondary coil do not connect rectification circuit and be electrically connected with the first terminal of described first electrode and the 4th terminal of described second electrode respectively; Conversion control apparatus, its control change device change action, make by the once electrification time that repeatedly constitutes repeatedly during the unit energising, in during sequence number is the constituent parts energising of odd number, by the polarity output high-frequency impulse of described converter by a side, by each high-frequency unit's energising cycle, the peak value of the primary return of the welding transformer of flowing through or the circulating current of secondary loop or the current setting value of virtual value and hope are unanimous on the whole; During sequence number is the constituent parts energising of even number, by the polarity output high-frequency impulse of described converter by the opposing party, by each described unit energising cycle, the peak value of the electric current that flows of the primary return of the welding transformer of flowing through or secondary loop or virtual value and current setting value are unanimous on the whole.Just can move at condition switching device shifter described in such exchange conversion formula power supply in good time, switch the alternative frequency during the energising of described unit according to the variation that described electric current presents regulation.
Desirable another form of the power circuit of resistive welder for coated wire of the present invention is, comprising: first rectification circuit, and it is with conversion of commercial frequency alternating voltage or DC voltage; Converter, it will convert the high-frequency ac pulse voltage to from the DC voltage of described first rectification circuit output; Welding transformer, its primary coil is electrically connected with the lead-out terminal of described converter; Second rectification circuit, its alternating voltage that will obtain from the secondary coil of described welding transformer converts DC voltage to and exports described principal current; Conversion control apparatus, it controls described converter change action, makes at the current setting value of the peak value of the elementary or secondary mobile electric current of welding transformer or virtual value and hope unanimous on the whole.
The desirable another form of the power circuit of resistive welder for coated wire of the present invention is, it can be the blow-up streaming, it comprises: welding transformer, it is input to primary coil with the commercial frequency alternating voltage by the contactor of being made up of a pair of controllable silicon, exports described principal current from secondary coil; The SCR control device, it controls described silicon controlled firing angle, makes the current setting value of the virtual value of the elementary or secondary electric current of described welding transformer of flowing through and hope unanimous on the whole.
Description of drawings
Fig. 1 is the main composition figure of the resistive welder for coated wire of one embodiment of the invention;
Fig. 2 is the plumb joint major part pie graph among the embodiment;
Fig. 3 is the circuit diagram of expression by the source of welding current portion of an embodiment;
Fig. 4 is the oscillogram of each electric current in the energising among the expression embodiment;
Fig. 5 decides each current waveform and the clock pulses figure of electric current restriction control for exchange conversion formula among the explanation embodiment;
Fig. 6 is the circuit diagram of expression by the source of welding current portion of other embodiment;
Fig. 7 is the circuit diagram of expression by the source of welding current portion of other embodiment.
The specific embodiment
Embodiments of the invention are described with reference to the accompanying drawings.
Fig. 1 has represented the main composition of the resistive welder for coated wire of one embodiment of the invention.This welder has plumb joint 10 and source of welding current portion 12, and upper electrode 14 and lower electrode 16 and pressurization part 18 are housed on the plumb joint.
Source of welding current portion 12 is from three-phase alternating current source terminal (R, S, T) input commercial frequency AC supply voltage; Become welding with direct current or alternating voltage in internal conversion, by the sub-12a of pair of output, 12b supplies with the conducting channel principal current Iw of plumb joint 10.
Like this, after plumb joint 10 energising, then from source of welding current portion 12 to the conducting channel of plumb joint 10 for principal current Iw because power supply initial stages two covered wire W1, the dielectric film of W2 stops principal current Iw to flow, electric current I w is vertical crossfire two electrodes 14,16 of flowing through just.Details is when to be exactly principal current Iw with direction as shown flow, and all electric current I w are via the conductive path circulation that the lead-out terminal 12b of the lead-out terminal 12a → lower electrode 16 of source of welding current portion 12 (electrode terminal 16a → limbs 16c → electrode leading section 16e → limbs 16d → electrode terminal 16b) → upper electrode 14 (electrode terminal 14b → limbs 14d → electrode leading section 14e → limbs 14c → electrode terminal 14a) → source of welding current portion 12 is such.If principal current Iw is when flowing with the direction opposite with direction as shown, then to flow with described path rightabout.
Like this in incipient a period of time of energising, because all principal current Iw is from the end to end longitudinal stream mistake of upper electrode 14 and lower electrode 16, so electrode leading section 14e at two electrodes 14,16,16e and the 14c of limbs portion, 14d, 16d, the 16c place produces Joule heat, by this Joule heat, the dielectric film of two covered wire W1, W2 is from being heated simultaneously up and down.
By heating simultaneously up and down, the dielectric film of two covered wire W1, W2 is fusion simultaneously almost, and the conductor in has revealed to come out separately.So the centre at upper electrode 14 and lower electrode 16 has just formed workpiece (W1, W2) conducting channel, most of electric current of principal current Iw is just from this conduction road circulation.
Details is exactly, when principal current Iw flows with direction as shown, flow to major part the principal current Iw of lower electrode 16 from the lead-out terminal 12a of source of welding current portion 12, pass through two covered wire W2 from the electrode leading section 16e of lower electrode 16, the conductor of W1 flows into the electrode leading section 14e of upper electrode 14, flow through the limbs 14c and the electrode terminal 14a of upper electrode 14 then, the lead-out terminal 12b by source of welding current portion 12 flows out again.A part (remaining part) that flows into the principal current Iw of lower electrode 16 is then passed through from the electrode leading section 16e of lower electrode 16, limbs 16d and electrode terminal 16b, the circuitous electrode terminal 14b that flows to upper electrode 14, converge with the electric current of the workpiece (W1, W2) of flowing through at electrode leading section 14e, flow to the lead-out terminal 12b of source of welding current portion 12.If principal current Iw is when flowing with the direction opposite with direction as shown, and then each electric current is to flow with described path rightabout.
Like this, in galvanization, the dielectric film fusing of two covered wire W1, W2, after conductor separately exposes, major part among the principal current Iw is by the shortest path of 14,16 at two electrodes, be the conductor of cross-current through two covered wire W1, W2, thus between the conductor of two covered wire W1, W2, just can realize efficiently, resistance welded stably.
Source of welding current portion 12 comprises also that the back will mention is used to be controlled at the control part of the energising and the pressurization of plumb joint 10.This control part can be in galvanization during the firm fusion of the dielectric film of two covered wire W1, W2 or the moment of estimation in time switch energising or pressurized conditions.For carrying out the control that this condition is switched, to the electric current I c of circulation on the circuit 15 between the electrode terminal 16b of the electrode terminal 14b of upper electrode 14 and lower electrode 16 and/or to lead-out terminal 12a in source of welding current portion 12,12b and two electrodes 16,14 electrode terminal 16a, circuit 17 between 14a, the electric current of circulation on 19, it is principal current Iw current sensor 24,26 measure, just can obtain the electric current I c of the around-France survey of current monitoring that will mention with the back, the attribute of Iw regulation is (as current value, pulsation, waveform etc.) variation detects two covered wire W1, the moment of the dielectric film fusion of W2.
Fig. 2 has represented to constitute in the major part of the plumb joint 10 of this embodiment.
Upper electrode installation portion 20 comprises: upright arm 30, its pressurised driving portion (as cylinder) that does not express in the figure in the pressurization part 18 (Fig. 1) action; Conductivity level arm 32, it is contained in the bottom of this upright arm 30, is added with the insulating materials (not shown) in the middle of both; The electrode support plate 34,36 of pair of right and left, it is vertically mounted on the front end face of described horizontal arm 32.The electrode support plate 36 on right side is electrically connected with horizontal arm 32 in the two electrode support plates 34,36, by the insulating materials (not shown) electric current is passed through between the electrode support plate 34 in left side and the horizontal arm 32.By insulating materials 38, electric current is passed through between two electrode support plates 34,36 yet.
The left and right sides electrode terminal 14b of upper electrode 14, but 14a is contained on the electrode support plate 34,36 on left side and right side in the clutch mode with bolt 40,42 respectively.The rearward end of horizontal arm 32 (rear side) is communicated with the conductive plate 44 of power output terminal 12b (Fig. 1).Conductive plate 44, horizontal arm 32 and right electrodes support plate 36 have constituted conducting wire 19 (Fig. 1) between the right electrodes terminal 14a of power output terminal 12b and upper electrode 14.
Lower electrode installation portion 22 is formed by the conducting block 48 that is fixed on the base 46, is added with in the middle of both the insulating materials (not shown) with the left and right pair of electrodes support plate 50,52 that an end face vertical fixing of this conducting block 48 is installed.The electrode support plate 52 on right side is realized being electrically connected with conducting block 48 in the two electrode support plates 50,52, and 48 of the electrode support plate 50 in left side and conducting blocks are added with the insulating materials (not shown), and electric current is passed through.50,52 of two electrode support plates also are added with insulating materials 54, and electric current is passed through.The left and right sides electrode terminal 16b of lower electrode 16, but 16a is contained on the electrode support plate 50,52 on left side and right side in the clutch mode with bolt 56,58 respectively.The rearward end of conducting block 48 (rear side) is communicated with the conductive plate 60 of power output terminal 12a (Fig. 1).Conductive plate 60, conducting block 48 and right electrodes support plate 52 have constituted conducting wire 17 (Fig. 1) between the right electrodes terminal 16a of power output terminal 12a and lower electrode 16.
Interconnect with cable 61 between the left electrodes support plate 34 on top and the left electrodes support plate 50 of bottom.These electrode support plates 34,50 and cable 61 have just constituted conducting wire (bypass resistance) 15 between the left electrodes terminal 16b of the left electrodes terminal 14b of upper electrode 14 and lower electrode 16.On cable 61, also can install as current sensor 24 as annulus.
Fig. 3 represents the formation by an embodiment source of welding current portion 12.The source of welding current portion 12 of this embodiment has used exchange conversion formula power circuit.Converter 62 in this power circuit comprises four transistor switching devices 64,66,68,70 of being made up of GTR (large power triode) or IGBT (insulated gate bipolar pipe).
Among these four switching device 64-70, the switching device 64,68 of first group (side of the positive electrode) by driving loop 72, switches (switch) control simultaneously according to the driven in phase pulse G1, the G3 that are sent by control part 74 conversion frequency (as 4KHz) in accordance with regulations; The switching device 66,70 of second group (negative side) by drive circuit 72, carries out switching controls according to the driven in phase pulse G2, the G4 that are sent by control part by described conversion frequency simultaneously.
The input terminal of converter 62 [L0, L1] joins with the lead-out terminal of rectified three-phase circuit 76.Rectified three-phase circuit 76 is pressed the three-phase bridge wiring to 6 diodes, (T) Shu Ru commercial three-phase alternating voltage carries out full-wave rectification and is transformed into DC voltage for R, S by the three-phase alternating current source terminal.From the DC voltage of rectified three-phase circuit 76 output by electric capacity 78 level and smooth after, pass to the input terminal [L0, L1] of converter 62.
The lead-out terminal of converter 62 [M0, M1] joins with the primary coil of welding transformer 80.By secondary conductor lead-out terminal 12a, 12b and conducting channel 17,19 are connected with the electrode terminal 16a of lower electrode 16 and the electrode terminal 14a of upper electrode 14 respectively at the two ends of the secondary coil of welding transformer 80.
In source of welding current portion 12, for finishing the energising control of Current feedback, in this side of primary circuit, on the lead of (then being in the configuration example at Fig. 1) between rectification circuit 76 and the converter 62, the current sensor of being made up of current transformer 86 has been installed between electric capacity 78 and the converter 62, output signal according to this current sensor 86, amperometric determination circuit 88 just can be measured the measured value (instantaneous value) at the primary current I1 of the input circulation of converter 62, with this measured value as amperometric determination signal MI1, and with its supply control part 74.
In addition, the output signal of the current sensor 24,26 that is equipped with according to this side of secondary loop, amperometric determination loop 90,92 can be measured the measured value (virtual value) of electric current I c, Iw respectively, with amperometric determination signal MIc, the MIw supply control part 74 of these amperometric determination values of expression.
The following describes the effect of this embodiment in source of welding current portion 12.
In the memory in control part 74, preestablished the welding condition of wanting processing work (W1, W2).The condition of particular importance is conduction time, current value, plus-pressure.
The setting of conduction time be remove for fusing the dielectric film of two covered wire W1, W2 required first conduction time WE1 and for the solderable conductor with two covered wire W1, W2 be connected together required second conduction time the WE2 separated into two parts.Here, first conduction time WE1 uncertain, only WE ' just can the capping time.Second conduction time WE2 begin when WE1 stops in first conduction time.In this source of welding current portion 12, for can as the back will be narrated, measure exactly first conduction time WE1 the moment that should stop switching on, so can manage the moment of WE2 energising beginning second conduction time, thereby also can manage like that by the time of setting WE2.Therefore, second conduction time WE2 just can be set at the conductor that is suitable for covered wire W1 and combine last appropriate conduction time with covered wire W2.
Current value can by first conduction time WE1 and second conduction time WE2 set respectively.First conduction time WE1 the setting current value of principal current Iw, can moltenly go the time of the desired usefulness of dielectric film of two covered wire W1, W2 select current value I s1 according to being fit to.The setting current value of the second logical time WE2 can be according to fetching selected current value I s2 at will be fit to two covered wire W1, W2 conduction time in the WE2 solderable conductor.
Plus-pressure also can by first conduction time WE1 and second conduction time WE2 set respectively.When the line of covered wire W1, W2 footpath hour, because the penetration speed of workpiece (between the conductor) is fast, then the stressed value in second conduction time can be set forr a short time than the plus-pressure value in the first conduction time WE1.
Because the source of welding current portion 12 of this embodiment is exchange conversion formulas, therefore the frequency of secondary ac cycle can be set arbitrarily, first conduction time WE1 and the second conduction time WE2 in the frequency of ac cycle also can independently set.
Fig. 4, Fig. 5 have represented the current waveform (example) of each several part in this embodiment energising.Convertor controls portion in illustrated example in the control part 74 carries out deciding electric current restriction control by current sensor 86 and amperometric determination circuit 88 instantaneous values feedback with primary current I1.Exchanging the deciding in the electric current restriction control of change type, the top at the clock cycle TC of regulation makes driving pulse G1, G3 be in the H level by driving loop 72, the position that the switch element 64,68 of certain side such as side of the positive electrode is positioned at out,
Driving pulse G2, G4 keep the L level at this moment, and the switching device 66,70 of negative side is positioned at the position of pass.The position that the switching device 64,68 of side of the positive electrode is positioned at out, primary current I1 then sets up in positive extreme direction.
Primary current I1 one normally sets up, amperometric determination signal MI1 in this clock cycle, reach to be applied to first conduction time WE1 the Limiting Level of setting current value I s1 regulation, then the convertor controls portion in the control part 74 is in the moment that arrives this Limiting Level, control impuls G1, G3 are turned back to the L level, and the switching device 64,68 of side of the positive electrode places the position of pass.
Because degradation change under increase of secondary circuit resistance value or the three-phase alternating-current supply voltage, primary current I1 sets up bad, amperometric determination signal MI1 does not reach Limiting Level sometimes in this clock cycle, at this moment before the terminal of clock cycle TC, fall, control impuls G1, G3, make the switching device 64,68 of side of the positive electrode place the position of pass.
Like this, in the half-wave of each positive polarity of primary side ac cycle (as T during the unit energising of odd number), as mentioned above the switching device 64,68 that is in the following side of the positive electrode of state of pass by switching device 66,70 in negative side do decide current limitation control, at high speed (with the frequency of converter) make change action, in the secondary-side circuitry of welding transformer 80, just have the principal current Iw that is platform shape ripple substantially mobile along positive direction.
In the half-wave of each negative polarity of primary side ac cycle (T conduction time of unit of even number), by the switching device 64,68 of the side of the positive electrode in converter 62 and switching device 66,70 exchanges of negative side, with the described the same high speed change action of doing, in the secondary circuit of welding transformer 80, just there is the principal current Iw that is platform shape ripple substantially to flow along negative direction.
As mentioned above, in the short time after the energising beginning, promptly first conduction time WE1 initial stage to the interstage, whole principal current Iw of plumb joint 10 are via bypass resistance 15, vertically connect upper electrode 14 and lower electrode 16.So the electric current I c of the bypass resistance 15 that circulates is identical with principal current Iw.In this stage, upper electrode 14 and lower electrode 16 generate heat respectively, from heating two covered wire W1, W2 up and down simultaneously.
Owing to be to heat simultaneously up and down, the dielectric film of two covered wire W1, W2 is fusion simultaneously almost.So just as shown in Figure 4, marked change has appearred in bypass resistance electric current I c, principal current Iw and 1 primary current I1.It is the current value step-down suddenly or sharp of bypass resistance electric current I c.The fluctuation of principal current Iw becomes big suddenly or sharp.And cataclysm Q has also appearred suddenly in each impulse amplitude Tp of each clock pulses of primary current I1.
Condition switching part in the control part 74 first conduction time WE1 can monitor the current value of bypass resistance electric current I c by current sensor 24 and amperometric determination circuit 90; Can monitor the fluctuation of principal current Iw by current sensor 26 and amperometric determination circuit 92.
Thereby after electric current is set up in the T during constituent parts energising, the current value I f of bypass resistance electric current I c and the monitoring value Ik of regulation are made comparisons, when the moment that becomes If＜Ik, the moment of having melted with regard to the dielectric film of decidable two covered wire W1, W2.
Perhaps calculate the fluctuation δ I of principal current Iw and make comparisons with the monitoring value Δ I of regulation, when the moment that becomes δ I＞Δ I, the moment of having melted with regard to the dielectric film of decidable two covered wire W1, W2.The calculation of principal current Iw fluctuation can frequency be in accordance with regulations extracted sample value out obtain maximal point and minimal point, with the difference of the maximal point that faces mutually and minimal point as the δ I that fluctuates.
Perhaps obtain primary current I1 at the impulse amplitude Tp of each clock cycle rate of change dTp, its monitoring value DTp with regulation is made comparisons, when the moment that becomes dTP＞DTp, the moment of having melted with regard to the dielectric film of decidable two covered wire W1, W2.In addition, also can not monitor the impulse amplitude Tp of primary current I1 and monitor the impulse amplitude of driving pulse G.
As mentioned above, one detects the molten moment of dielectric film of two covered wire W1, W2, condition switching part in the control part 74 just during the unit that detects this moment switches in the T with WE1 termination first conduction time, from T conduction time of next unit beginning WE2 second conduction time, at this, to conduction time, welding conditions such as current setting value and plus-pressure are switched.In illustrated example, on the secondary ac cycle basis with second conduction time WE2 be set at one-period (two cycles on unit basis conduction time).In addition, the setting value Is2 of principal current Iw set much larger than first conduction time WE1 setting value Is1.
In the second conduction time WE2, because the major part among the principal current Iw is the conductor circulation of cross-section two covered wire W1, W2 by the shortest path of 16 of upper electrode 14 and lower electrodes all, the electric current I c of the circuitous bypass resistance 15 of flowing through reduces gradually and is similar to zero.Still have big fluctuation δ I to occur on the principal current Iw, echo mutually with the current fluctuation δ I of this primary side, the impulse amplitude of primary current I1 also intermittently and significantly continues change.But the heat energy of supplying with two covered wire W1, W2 by two electrodes 14,16 is very stable, the conductor of two covered wire W1, W2 by efficient and stable resistance welded by firmly, combine in high quality.
Fig. 6 has represented the formation of the source of welding current portion 12 of another embodiment.The power circuit of the source of welding current portion 12 usefulness direct current change types of this embodiment.The same symbol of part mark that among the figure exchange conversion formula power circuit with described embodiment is had same in fact formation or same function.
In the DC converting formula, on welding transformer 80 secondary, adorned the rectification circuit of forming by pair of diodes 94,96 98.Details be exactly with the two ends of the secondary coil of welding transformer 80 respectively the lead-out terminal 12a by diode 94,96 and side of the positive electrode be connected together and the centre tap of secondary coil and the lead-out terminal 12b of negative side are connected together.
The converter 62 of primary side, during whole energising, alternatively control switching by the switching device 64,68 of side of the positive electrode and the switching device 66,70 of negative side in each clock cycle according to the limit, send the ac pulse voltage of conversion frequency to the elementary circle of welding transformer 80 from the lead-out terminal [M0, M1] of converter 62.
On the secondary coil of welding transformer 80, the secondary ac pulse voltage that produces because of induced electromotive force is transformed into direct current by rectification circuit 98, and from lead-out terminal 12a, 12b is to the weld part output direct current principal current Iw of plumb joint 10.
In this embodiment, remove secondary principal current Iw and bypass resistance electric current I c is outside the direct current, also the exchange conversion formula with described embodiment plays a part same.Particularly in the dielectric film fusion that detects two covered wire W1, W2 constantly, formation and the function relevant with described embodiment can be intactly used in the effect of switching welding condition, therefore also can obtain and described same effect.
Fig. 7 has represented to adopt in source of welding current portion 12 configuration example of blow-up streaming power circuit.At this power supply unit,, be supplied to the primary coil of welding transformer 80 by the contactor of forming by a pair of controllable silicon 104,106 by the commercial frequency single phase ac voltage V of input terminal 100,102 inputs.Produce induced electromotive force (secondary-side voltage) on the secondary coil of welding transformer 80, by lead-out terminal 12a, 12b will exchange the weld part that secondary current or principal current Iw export to plumb joint 10.
The size of principal current Iw (virtual value) is by energising angle decision, owing to have certain relation substantially between firing angle and the energising angle, thereby also we can say by firing angle and decide.SCR control portion in the control part 74 passes through the firing angle (scratch start is constantly) of some arc circuit 108 control controllable silicons 104,106 in the present embodiment, thus the virtual value of control principal current Iw.
In the present embodiment, though though aspect control rate and fine degree less better than described embodiment exchange conversion formula, can obtain effect and the effect same basically with described exchange conversion formula.
Each one of described example constitutes, and particularly the circuit formation in formation of electrode peripheral part of plumb joint 10 and the source of welding current portion 12 is an example.In the scope of technical thought of the present invention, can do all distortion.Shape, size, material as top electrode 14 and lower electrode 16 not necessarily must be consistent, according to material, shape and the welding standard of two covered wire W1, W2, can adopt different electrode structures respectively.
In the DC converting formula of described embodiment, because that supply plumb joint 10 is direct current principal current Iw, what circulate in each one of two electrodes 14,16 usually is unidirectional electric current, and therefore the degree of wear of two electrodes 14,16 also easily produces different.For this reason, the lead-out terminal 12a in source of welding current portion 12,12b and 14,16 at two electrodes are equipped with the assortment device, can be power output terminal 12a to the energising polarity of welded joint 10, and the relation of continuing that 12b and two electrodes are 14,16 is done regular inverse transformation.What transform type power among the described embodiment adopted is the limit control mode of deciding Current Control, but also can adopt error between each clock cycle detects measured value and sets value to come the conversion pulse amplitude mode of conversion pulse amplitude.
In described embodiment, employing be to decide current control mode, can adopts yet and decide Control of Voltage or decide power control and wait other control mode, and covered wire do not limit in conjunction with two yet, on the single line simultaneously in conjunction with two, line more than three or three can.It is the circle line that covered wire also is not limited to, and also can be lenticular wire etc.
As mentioned above, with the resistive welder for coated wire of Fa Benming, a plurality of covered wires efficiently and well can be welded.Particularly upper electrode and lower electrode both sides constitute by single type or one-piece type heating electrode, can be with the dielectric film of two covered wires from fusion simultaneously up and down and switch to the best welding condition that two covered wire dielectric films are removed back resistance welded two covered wire conductors, thus good welding quality obtained.When the current switching of removing the dielectric film of covered wire from supply become to be supplied with the electric current of welding covered wire conductor, also can switch in the suitable moment.
Claims (12)
1, a kind of resistive welder for coated wire, its with a plurality of covered wires overlapping and with resistance welded with its combination, wherein, comprise: first electrode, its by be equipped with first, second terminal have electric conductivity and high febrifacient parts are made, and contact with the plus-pressure in accordance with regulations of the electrode leading section between described first, second terminal with described covered wire of the side; Second electrode, its by be equipped with the 3rd, the 4th terminal have electric conductivity and high febrifacient parts are made, and be electrically connected with second terminal of described first electrode with described the 3rd terminal, with the electrode leading section between described the 3rd, the 4th terminal from contacting with described the opposing party's covered wire pressure in accordance with regulations with an opposite side of described first electrode; Power circuit, it comprises first lead-out terminal that is electrically connected with the first terminal of described first electrode and second lead-out terminal that is electrically connected with the 4th terminal of described second electrode, and the conducting channel between described first and second lead-out terminals is supplied with principal current.
2, resistive welder for coated wire as claimed in claim 1 wherein, has the condition switching device shifter, and its monitor flows presents moment switching energising or the pressurized conditions that regulation changes through the rated current of described power circuit or described electrode and according to described electric current.
3, resistive welder for coated wire as claimed in claim 2, wherein, described condition switching device shifter presents moment that regulation changes according to described electric current and switches the current setting value of described principal current.
4, resistive welder for coated wire as claimed in claim 2, wherein, described condition switching device shifter is used to weld the mutual setting-up time of described covered wire conductor according to the moment that described electric current presents the regulation variation with switching to later conduction time.
5, resistive welder for coated wire as claimed in claim 2, wherein, described condition switching device shifter switches the stressed size that is added on the described covered wire according to the moment that described electric current presents the regulation variation.
6, as each described resistive welder for coated wire in the claim 2～5, wherein, described condition switching device shifter comprises: first current-flow test set, and it is used to be determined at the electric current that flows between the 3rd terminal of second terminal of described first electrode and described second electrode; First current monitor, it monitors the current value of the described electric current of being measured by described first current-flow test set, and detects the low moment of monitoring value of the current value ratio regulation of described electric current.
7, as each described resistive welder for coated wire in the claim 2～5, wherein, described condition switching device shifter comprises: second current-flow test set, and it is used to measure described principal current; Second current monitor, it monitors the fluctuation of the described principal current of being measured by described second current-flow test set, and detects the moment of the fluctuation overshoot monitoring value of described principal current.
8, resistive welder for coated wire as claimed in claim 1, wherein, described power circuit comprises:
Rectification circuit, its AC voltage conversion with commercial frequency becomes DC voltage;
Converter, it will become high-frequency pulse voltage from the dc voltage conversion of described rectification circuit output;
Welding transformer, the two ends of its primary coil are electrically connected with the lead-out terminal of described converter, the obstructed over commutation circuit in the two ends of secondary coil and with the 4th terminal of the first terminal of described first electrode and described second electrode electrical ties respectively;
Conversion control apparatus, it controls the change action of described converter, make by the once electrification time that repeatedly constitutes repeatedly during the unit energising, be during the constituent parts energising of odd number by the polarity output high-frequency impulse of described converter in sequence number by a side, by the per unit energising cycle of described high-frequency impulse, make the electric current setting of the peak value of the electric current that in the primary circuit of described welding transformer or secondary circuit, flows or virtual value and hope unanimous on the whole, be to export described high-frequency impulse by described converter by the opposing party's polarity during the constituent parts energising of even number in sequence number, by described each unit energising cycle, make the peak value of the electric current that in the primary circuit of described welding transformer or secondary circuit, flows or virtual value and described current setting value unanimous on the whole.
9, as each described resistive welder for coated wire in the claim 2～5, wherein, described power circuit comprises:
Rectification circuit, its AC voltage conversion with commercial frequency becomes DC voltage;
Converter, it will become high-frequency pulse voltage from the dc voltage conversion of described rectification circuit output;
Welding transformer, the two ends of its primary coil are electrically connected with the lead-out terminal of described converter, the obstructed over commutation circuit in the two ends of secondary coil and with the 4th terminal of the first terminal of described first electrode and described second electrode electrical ties respectively;
Conversion control apparatus, it controls the change action of described converter, make by the once electrification time that repeatedly constitutes repeatedly during the unit energising, be during the constituent parts energising of odd number by the polarity output high-frequency impulse of described converter in sequence number by a side, by the per unit energising cycle of described high-frequency impulse, make the electric current setting of the peak value of the electric current that in the primary circuit of described welding transformer or secondary circuit, flows or virtual value and hope unanimous on the whole, be to export described high-frequency impulse by described converter by the opposing party's polarity during the constituent parts energising of even number in sequence number, by described each unit energising cycle, make the peak value of the electric current that in the primary circuit of described welding transformer or secondary circuit, flows or virtual value and described current setting value unanimous on the whole.
10, resistive welder for coated wire as claimed in claim 9, wherein, described condition switching device shifter presents the moment that regulation changes according to described electric current, switches the alternative frequency during described unit switches on.
11, as each described resistive welder for coated wire in the claim 2～5, wherein, described power circuit comprises:
First rectification circuit, its AC voltage conversion with commercial frequency becomes DC voltage;
Converter, it will become the high-frequency ac pulse voltage from the dc voltage conversion of described first rectification circuit output;
Welding transformer, its primary coil is electrically connected with the lead-out terminal of described converter;
Second rectification circuit, it will become DC voltage from the alternating voltage that described welding transformer secondary coil obtains and export described principal current;
Conversion control apparatus, it controls described converter change action, makes at the current setting value of the peak value of the elementary or secondary mobile electric current of described welding transformer or virtual value and hope unanimous on the whole.
12, as each described resistive welder for coated wire in the claim 2～5, wherein, described power circuit comprises:
Welding transformer, its alternating voltage with commercial frequency is input to primary coil by the contactor of being made up of a pair of controllable silicon, exports described principal current from secondary coil;
The SCR control device, its control silicon controlled firing angle makes at the current setting value of the elementary or secondary mobile electric current virtual value of described welding transformer and hope unanimous on the whole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001132883A JP2002321068A (en) | 2001-04-27 | 2001-04-27 | Resistance welding device for covered wire |
| JP132883/01 | 2001-04-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1383954A CN1383954A (en) | 2002-12-11 |
| CN1272137C true CN1272137C (en) | 2006-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02118537 Expired - Fee Related CN1272137C (en) | 2001-04-27 | 2002-04-27 | Resistive welder for coated wire |
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| JP (1) | JP2002321068A (en) |
| CN (1) | CN1272137C (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3917964B2 (en) * | 2003-08-22 | 2007-05-23 | 株式会社 工房Ｐｄａ | Heater chip for thermocompression bonding |
| DE102004010723A1 (en) * | 2004-03-05 | 2005-09-22 | Minebea Co., Ltd. | Method for producing an electrical connection between a plurality of enamel-insulated conductors |
| JP5305195B2 (en) * | 2008-09-30 | 2013-10-02 | 高周波熱錬株式会社 | Metal welding method |
| WO2010038779A1 (en) * | 2008-09-30 | 2010-04-08 | 高周波熱錬株式会社 | Welding device for metal and welding method for metal |
| JP5305194B2 (en) * | 2008-09-30 | 2013-10-02 | 高周波熱錬株式会社 | Metal welding equipment |
| JP5233860B2 (en) * | 2009-06-19 | 2013-07-10 | 株式会社デンソー | Fusing welding method and apparatus |
| CN102055125A (en) * | 2009-11-10 | 2011-05-11 | 天津北科精工自动化科技发展有限责任公司 | Coil enamelled wire head clamping and resistance welding device |
| CN101829842A (en) * | 2010-04-27 | 2010-09-15 | 广州（从化）亨龙机电制造实业有限公司 | Special seam welding technique for continuous electric resistance welding of silver strips and copper strips |
| KR101593642B1 (en) * | 2010-06-29 | 2016-02-16 | 한양대학교 산학협력단 | Inverter dc resistance spot welding system, control method for welding process thereof and design method for fuzzy controller thereof |
| CN102091858B (en) * | 2010-12-31 | 2014-04-09 | 广州微点焊设备有限公司 | Parallel electrode welding head for resistance welding |
| JP2012170973A (en) * | 2011-02-21 | 2012-09-10 | Honda Motor Co Ltd | Conductor connecting method, and conductor connecting device |
| CN102528258B (en) * | 2012-01-11 | 2013-12-04 | 西北工业大学 | Multi-wire copper harness end forming device and forming method thereof |
| CN103331511B (en) * | 2013-07-03 | 2014-07-02 | 林青云 | Electric resistance welding method, and electrode welding head used in electric resistance welding method |
| CN103921005B (en) * | 2013-12-03 | 2017-01-04 | 广州微点焊设备有限公司 | The micro-welding equipment of Pyroelectric Media welding resistance |
| CN106207701B (en) * | 2016-08-31 | 2018-08-14 | 江苏亨鑫科技有限公司 | The fabricating tools device and its working method of main feeder wire jumper |
| CN109128477A (en) * | 2018-10-31 | 2019-01-04 | 廖承建 | A kind of welding method of novel terminal thermocompression bonder and terminal |
| JP7468418B2 (en) * | 2021-03-18 | 2024-04-16 | トヨタ自動車株式会社 | Welding determination method and spot welding device |
| CN113690035B (en) * | 2021-08-20 | 2023-08-11 | 中正智控（江苏）智能科技有限公司 | Secondary high-frequency direct-current resistance welding transformer with polarity changing function |
-
2001
- 2001-04-27 JP JP2001132883A patent/JP2002321068A/en active Pending
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2002
- 2002-04-27 CN CN 02118537 patent/CN1272137C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2002321068A (en) | 2002-11-05 |
| CN1383954A (en) | 2002-12-11 |
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