CN1203844A - Control system for use in resistance spot weld and method therefor - Google Patents
Control system for use in resistance spot weld and method therefor Download PDFInfo
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- CN1203844A CN1203844A CN 98102915 CN98102915A CN1203844A CN 1203844 A CN1203844 A CN 1203844A CN 98102915 CN98102915 CN 98102915 CN 98102915 A CN98102915 A CN 98102915A CN 1203844 A CN1203844 A CN 1203844A
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Abstract
A resistance spot weld device used for controlling resistance spot weld quality comprises a primary circuit capable of generating a jointing current under a voltage, a secondary circuit and a transformer, and further comprises a current sensor for detecting a jointing current, a voltage sensor, a dynamic resistance calculator, a comparator, a memory and a jointing current controller. N preconcerted dynamic resistance curves are stored in the memory, and a preconcerted dynamic resistance curve is selected initially, and then the dynamic resistance calculator works out a dynamic resistance on the basis of a jointing current and voltage detected. Said jointing current controller adjusts a jointing current to control resistance spot weld quality on the basis of a compared result from said comparator which compares a dynamic resistance and a selected preconcerted dynamic resistance curve.
Description
The present invention relates to a kind of control system and method thereof that is used for resistance spot welding, relate in particular to a kind of control system and method thereof that adopts a memory that stores one group of standard dynamic resistance curve to come the controlling resistance point quality.
At present, connect the various occasions of pair of metal plate in the automobile making process, resistance spot welding has obtained using widely.As everyone knows, for resistance spot welding, quality control is one of main difficulty in the welding process.
Usually, the resistance spot welding device comprises mash welder, pair of metal plate, a transformer, a controller, a current sensor, a voltage sensor and the microprocessor that a pair of welding electrode is arranged.
In the resistance spot welding device, the controller that matches with transformer is given and is wanted soldered metallic plate that electric current and voltage are provided.In resistance spot welding process, promptly weld in the time interval of a point, current sensor and voltage sensor be generation and welding current and the proportional analog signal of voltage respectively, one of them resistance spot welding welding interval comprises a large amount of half cycles, and one-period is exactly 1 frequency divided by electric current and voltage.Microprocessor is used in the resistance spot welding process detected electric current and potentiometer and calculates a dynamic electric resistor value, and produces a control signal on the basis of this dynamic electric resistor value, then this control signal is sent to controller.Controller acts on the initial welding current in the resistance spot welding machine circuit according to microprocessor control signal when controlling resistance spot welding next time.
One of major defect of above-mentioned typical resistance spot welding device is that it can not be controlled at the error that occurs in the resistance spot welding welding process, because the initial welding current when it only controls resistance spot welding next time, rather than the current electric current of ongoing resistance spot welding process, that is to say that said apparatus can not provide Real-time Error.
So main purpose of the present invention provides a kind of improved control system that adopts a memory that stores one group of standard dynamic resistance curve to come the controlling resistance point quality.
According to the present invention, provide a control system of in the resistance spot welding device of a current sensor that has the controlling resistance spot weld operation and a voltage sensor, using, this system comprises: a memory that stores N the predetermined dynamic electric resistor value of this memory, corresponding dynamic resistance curve of each value representation, when resistance spot welding begins, provide a predetermined dynamic electric resistor value according to predetermined welding condition; One according to current sensor senses to welding current and voltage sensor senses to voltage calculate the dynamic electric resistor calculator of dynamic electric resistor value; A comparator that is used for comparison dynamic electric resistor and selected predetermined dynamic electric resistor value; And one be used for regulating welding current according to comparative result, thus the welding current controller of controlling resistance point quality.
By following description to concrete preferred embodiment, the present invention will become very obvious together with purpose and the advantage with other described above in conjunction with the accompanying drawings, wherein:
Fig. 1 is the resistance spot welding schematic representation of apparatus that has welding quality controller of the present invention.
Fig. 2 is a standard dynamic resistance curve demonstration example of storing in the memory of welding quality controller among Fig. 1.
Fig. 1 has described the resistance spot welding device 100 that has welding quality controller 150 of the present invention, and wherein welding quality controller 150 comprises a dynamic electric resistor calculator 152, comparator 154, a memory 156 and a welding current controller 158.This resistance spot welding device 100 also comprises one by elementary winding, the transformer 120 that iron core and secondary windings are formed, one comprises the elementary winding of transformer and the primary return 130 of a SCR who is made up of a SCR (SCR1) and low two SCR (SCR2) (rectifier of semiconductor control) piece 136, one comprises pair of electrodes 112,114, a pair ofly be clamped in electrode 112,114 metallic plate 116, the secondary windings of transformer 120, a current sensor 140, the secondary loop 110 of voltage sensor 142 and welding quality controller 150.
For the sake of simplicity, suppose that input voltage is decided to be a predetermined value.At first, for in the predetermined welding condition of N kind any, welding process is all carried out repeatedly under the predetermined initial welding current that current sensor 140 is measured, thereby produce many group dynamic electric resistors, wherein each the dynamic electric resistor value in a group all is to be decided divided by current value by voltage sensor 142 and current sensor 140 measured magnitudes of voltage, and the voltage and current value is represented the RMS value (root mean square) on their every half cycles respectively.Said process carries out at different initial welding currents, thereby has produced the many groups of dynamic electric resistor values corresponding to the initial welding current of difference.Secondly, the battery of tests data that obtain best welding quality be confirmed as each predetermined welding condition one group of dynamic electric resistor value and with its corresponding initial welding current.In another preferred embodiment of the present invention, the initial welding current of a certain predetermined welding condition can be fixed, and the resistance value of one group of optimum then can obtain from the fixing initial welding current of predetermined welding condition.
Shown in Figure 2 is one group of optimum dynamic electric resistor value as example of memory 156 storages of the welding quality controller 150 among Fig. 1.In this case, metallic plate 116 for example is a mild steel, and the thickness of every metallic plate is about 0.7mm, organize optimum dynamic electric resistor value then by being set to for example about 9000A when resistance spot welding device 100 initial welding currents as this of example, one group of selection has the dynamic electric resistor value of best welding quality and obtains from many test datas.It should be noted that each dot in Fig. 2 represents the dynamic electric resistor value of the resistance spot welding of a corresponding half cycle in the welding interval of resistance spot welding.
In welder 100, if the user begins a resistance spot welding, need to select a certain criteria dynamic resistance curve corresponding to one group in the memory 156 optimum dynamic electric resistor value by a certain options button on the lower keyboard (not shown), wherein this certain criteria dynamic resistance curve is decided according to predetermined welding condition.This given welding condition is then decided by the welding parameter as by the thickness etc. of weldering metallic plate, that is to say, before the welding beginning, the user can distinguish this welding condition, and can select the standard dynamic resistance curve corresponding to this given welding condition.After options button was pressed, this selection signal was imported into memory 156.This selects signal memory 156 responses, and selected standard dynamic resistance curve is sent to comparator 154, and corresponding initial welding current is also delivered to welding current controller 158 by circuit L20.Welding current controller 158 sends a gate control signal for SCR piece 136, thereby primary current is set to initial welding current.
On the other hand, predetermined AC (interchange) input voltage V is added to input 132,134, thereby makes the flow through elementary winding of SCR piece 136 and transformer 120 of primary current, and wherein this ac input voltage generally is 220V, 380V or 440V.At the P of welding interval, for example in 1 or 2 the initial half cycles, primary current is set to corresponding initial welding current IS by the gate control signal that sends to SCR piece 136 by welding current controller 158.In secondary loop 110, wherein voltage and current changes transformer 120 with the electric energy transfer of primary return 130, makes the electric current of current ratio primary return 130 of secondary loop 110 bigger.During resistance spot welding, pair of electrodes 112,114 clamps metallic plate 116, and makes secondary current pass through the regional area of metallic plate 116, thereby welds this regional area.Current sensor 140 is connected in the secondary loop 110, be used for detecting the welding current of each half cycle in the welding interval, wherein this welding interval comprises M half cycle, and this detected electric current is transmitted to the dynamic electric resistor calculator 152 of welding quality controller 150.Equally, voltage sensor 142 is connected on the electrode 112,114, is used for detecting the voltage of the secondary loop 110 of each half cycle in the welding interval, and wherein this detected voltage is transmitted to dynamic electric resistor calculator 152.
In dynamic electric resistor calculator 152, the dynamic electric resistor RD of each half cycle in the welding interval can be obtained by following formula:
R
D=V
D/ I
D Formula 1
V wherein
DThe RMS value of representing detected voltage, I
DThe RMS value of representing detected welding current.Dynamic electric resistor calculator 152 is with the dynamic electric resistor R that calculates
DSend comparator 154 to.
Δ I=K * Δ R formula 2
Wherein K is a constant.Welding current controller 158 give SCR piece 136 send a next half cycle corresponding to welding current I
NThe gate control signal, by the quality of inferior resistance spot welding device 100 controlling resistance spot welding, wherein I
N=I
S+ Δ I.Said process repeats in next half cycle, and welding current is conditioned in half cycle subsequently, finishes up to welding interval.
Compare with existing resistance spot welding device, adopt the quality of resistance spot welding device 100 of the present invention controlling resistance spot welding more accurately, this belongs to memory stores has N to organize initial welding current value and standard dynamic resistance curve, each group is corresponding one welding condition of being scheduled to all, welding quality controller 150 is being controlled the welding current in the unit interval, for example the welding current that half cycle is interior.
Although the present invention is the description of doing according to preferred embodiment, under the prerequisite that does not break away from the spirit and scope of the present invention, can make any modifications and variations, as in following claim statement.
Claims (16)
1, a kind of control system of use that is used for the controlling resistance spot weld operation of the resistance spot welding device that is used for having a current sensor and a voltage sensor, this control system comprises:
Store the device of the predetermined dynamic electric resistor value of N group, each class value is represented a corresponding dynamic resistance curve, and N is a predetermined positive integer;
When resistance spot welding begins, select the device of a predetermined dynamic electric resistor value according to predetermined welding condition;
According to current sensor senses to welding current and voltage sensor senses to voltage calculate the device of dynamic electric resistor value;
The device that compares dynamic electric resistor and selected predetermined dynamic electric resistor value; And
According to comparative result, regulate welding current, thus the device of controlling resistance point quality.
2, control system according to claim 1, wherein in a resistance spot welding process, welding current comprises M half cycle, M is a predetermined positive integer.
3, control system according to claim 2, wherein each bar dynamic resistance curve represents that wherein cycle weld interval is divided into M sample point, promptly represents M half cycle as the variation of the dynamic electric resistor of the function of cycle weld interval and its amplitude.
4, control system according to claim 3, wherein storage device also has N initial current value, corresponding each the bar dynamic resistance curve of each initial current value.
5, control system according to claim 4, wherein adjusting device is arranged to welding current the corresponding initial welding current IS of selected dynamic resistance curve in 1 of cycle weld interval or 2 half cycles.
6, control system according to claim 5 wherein calculates the dynamic electric resistor in a half cycle in cycle weld interval.
7, control system according to claim 6, wherein the dynamic electric resistor value of corresponding half cycle on the dynamic electric resistor value that relatively calculates of comparison means and the selected dynamic resistance curve.
8, control system according to claim 7, wherein adjusting device is calculated the offset Δ I of welding current according to comparative result.
9, control system according to claim 8, wherein adjusting device offers the welding current I of the next half cycle of resistance spot welding device
N, I wherein
NBe I
SWith Δ I and.
10, control system according to claim 1, wherein predetermined welding condition are by being determined by the thickness of weldering metallic plate and kind.
11, control system according to claim 2, wherein each predetermined dynamic electric resistor value all is to obtain being scheduled to repeat resistance spot welding under the welding condition, wherein, predetermined welding condition is by being determined by the thickness of weldering metallic plate and kind.
12, control system according to claim 11, the test data that wherein has best resistance spot welding quality under predetermined welding condition is decided to be the dynamic resistance curve of corresponding given welding condition.
13, a kind of resistance spot welding device that is used to have a bond pads electrode be used for control one group of method of being welded the welding current of metal, may further comprise the steps:
(a) be interior one a group of optimal dynamic resistance value and initial current value IS of cycle weld interval of this group metal storage, this cycle weld interval comprises K half cycle, and K is a predetermined positive integer;
(b) apply an initial current IS corresponding to the initial welding current value of storing for described welding electrode;
(c) voltage and current of detection welding electrode, and according to detected voltage and current calculating dynamic electric resistor value;
(d) draw deviation between dynamic electric resistor value and the selected optimum dynamic electric resistor value that goes out; And
(e) according to this bias adjustment welding current.
14, method according to claim 13, the welding current after wherein should regulating is by I
SWith one of this deviation predetermined positive several times and definite.
15, method according to claim 14 wherein adopts initial welding current in initial 1 or 2 half cycles.
16, method according to claim 15 wherein in each later half cycle of initial 1 or 2 half cycles, is carried out regulating step (e).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98102915 CN1203844A (en) | 1997-06-04 | 1998-06-04 | Control system for use in resistance spot weld and method therefor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR23020/1997 | 1997-06-04 | ||
| CN 98102915 CN1203844A (en) | 1997-06-04 | 1998-06-04 | Control system for use in resistance spot weld and method therefor |
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| Publication Number | Publication Date |
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| CN1203844A true CN1203844A (en) | 1999-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98102915 Pending CN1203844A (en) | 1997-06-04 | 1998-06-04 | Control system for use in resistance spot weld and method therefor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304157C (en) * | 2001-05-01 | 2007-03-14 | 小原株式会社 | Method of protecting data stored in the memory of welding controller |
| CN101920388A (en) * | 2009-05-29 | 2010-12-22 | 泰克纳股份公司 | Be used to detect the device and the relevant welding machine equipped therewith of soldered material thickness |
| CN102699508A (en) * | 2012-05-30 | 2012-10-03 | 天津大学 | Control system of multi-electrode resistance spot welding machine |
| CN104384696A (en) * | 2014-11-14 | 2015-03-04 | 广州松兴电气有限公司 | Aluminum alloy plate special resistance welding technology and aluminum alloy plate special resistance welding equipment |
| CN104749446A (en) * | 2015-02-28 | 2015-07-01 | 重庆理工大学 | Online detection method for resistance spot welding electrode loss |
| CN107671406A (en) * | 2017-11-01 | 2018-02-09 | 上海交通大学 | D.C. resistance spot welding multi-modal feedback control method |
| CN109317799A (en) * | 2018-11-21 | 2019-02-12 | 广州市精源电子设备有限公司 | Spot welding power source output adjustment method, device, system and storage medium |
| CN116810117A (en) * | 2023-08-28 | 2023-09-29 | 苏州同泰新能源科技股份有限公司 | Welding method of resistance welding machine capable of outputting energy in temperature compensation mode |
-
1998
- 1998-06-04 CN CN 98102915 patent/CN1203844A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304157C (en) * | 2001-05-01 | 2007-03-14 | 小原株式会社 | Method of protecting data stored in the memory of welding controller |
| CN101920388A (en) * | 2009-05-29 | 2010-12-22 | 泰克纳股份公司 | Be used to detect the device and the relevant welding machine equipped therewith of soldered material thickness |
| CN101920388B (en) * | 2009-05-29 | 2015-11-25 | 泰克纳股份公司 | For detecting the device of soldered material thickness and relevant welding machine equipped therewith |
| CN102699508B (en) * | 2012-05-30 | 2014-07-16 | 天津大学 | Control system of multi-electrode resistance spot welding machine |
| CN102699508A (en) * | 2012-05-30 | 2012-10-03 | 天津大学 | Control system of multi-electrode resistance spot welding machine |
| CN104384696A (en) * | 2014-11-14 | 2015-03-04 | 广州松兴电气有限公司 | Aluminum alloy plate special resistance welding technology and aluminum alloy plate special resistance welding equipment |
| CN104749446A (en) * | 2015-02-28 | 2015-07-01 | 重庆理工大学 | Online detection method for resistance spot welding electrode loss |
| CN104749446B (en) * | 2015-02-28 | 2018-06-05 | 重庆理工大学 | A kind of online test method of lifetime of resistance spot welding electrode loss |
| CN107671406A (en) * | 2017-11-01 | 2018-02-09 | 上海交通大学 | D.C. resistance spot welding multi-modal feedback control method |
| CN107671406B (en) * | 2017-11-01 | 2019-09-24 | 上海交通大学 | D.C. resistance spot welding multi-modal feedback control method |
| CN109317799A (en) * | 2018-11-21 | 2019-02-12 | 广州市精源电子设备有限公司 | Spot welding power source output adjustment method, device, system and storage medium |
| CN116810117A (en) * | 2023-08-28 | 2023-09-29 | 苏州同泰新能源科技股份有限公司 | Welding method of resistance welding machine capable of outputting energy in temperature compensation mode |
| CN116810117B (en) * | 2023-08-28 | 2023-11-17 | 苏州同泰新能源科技股份有限公司 | Welding method of resistance welding machine capable of outputting energy in temperature compensation mode |
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