CN102350579A - Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal - Google Patents
Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal Download PDFInfo
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- CN102350579A CN102350579A CN2011100899381A CN201110089938A CN102350579A CN 102350579 A CN102350579 A CN 102350579A CN 2011100899381 A CN2011100899381 A CN 2011100899381A CN 201110089938 A CN201110089938 A CN 201110089938A CN 102350579 A CN102350579 A CN 102350579A
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Abstract
The invention discloses an arc interruption preventing cutting method of an air plasma cutter. The method comprises different working conditions comprising an original state, an arc striking state, an initial metal entity part cutting stage, a metal blank part cutting stage, mutual switching of metal entity part cutting and metal blank part cutting, a cutting end state, and the like, and automatic switching between non-transfer type arcs and transfer type arcs of electric arcs is controlled through regulating the voltage duty ratio of each insulated gate bipolar transistor (IGBT) in a working project, so that no arc interruption in the cutting process of grid-shaped metal can be realized.
Description
Technical field
The invention belongs to the metalworking technology field, be specifically related to the anti-current interruption cutting method that a kind of air plasma cutter cuts latticed metal.
Background technology
In recent years, along with the development of Power Electronic Technique, the plasma cutting extensively applies to all trades and professions such as locomotive, engineering machinery, steel construction gradually.Air type plasma cutting because of its to the non-ferrous metal good cutting effect; Cutting speed receives user's favor soon; But in cutting process; During for latticed Metal Cutting; Need frequent back and forth current interruption; Cause the damage of nozzle and electrode easily, the operating efficiency when having reduced cutting more greatly.
Summary of the invention
The purpose of this invention is to provide the anti-current interruption cutting method that a kind of air plasma cutter cuts latticed metal, when cutting latticed metal, need back and forth the manually shortcoming of current interruption to solve the cutting of prior art air formula plasma.
The technical scheme that the present invention adopted is; A kind of air plasma cutter cuts the anti-current interruption cutting method of latticed metal; This method is utilized a kind of device; This device comprise burning torch and be connected with burning torch power control; Burning torch is provided with the gas circuit of be used to blow off this burning torch top nozzle and electrode; Power control comprises and is used for the cutting loop that is connected with workpiece; And be used for the striking loop that is connected with nozzle, also be connected with the detection signal circuit that is used to detect the cutting switching signal between the cutting switch of burning torch and the power control;
This method may further comprise the steps:
A, original state: nozzle is connected with electric pole short circuit, and no electric arc produces between nozzle and the workpiece;
B, striking state: press the cutting switch; The detection signal circuit sends to power control with detected cutting switching signal; Power control control striking loop conducting; And control gas circuit air feed; When utilizing the air thrust to make nozzle and electrode separation; Produce electric arc between nozzle and the workpiece, the size of current of this electric arc remains on 20A～25A, and pilot arc does not go out;
The stage at c, initial cut metal solid place: when nozzle begins to cut near the entity place of workpiece, the cutting loop conducting, power control turn-offs the striking loop, and makes arc current remain on 30A～100A, and pilot arc does not go out;
The stage of d, cutting metal blank space: when nozzle was cut to the blank space of workpiece, the cutting loop electric current turn-offed, power control conducting striking loop, and make the size of current of electric arc remain on 20A～25A, pilot arc does not go out;
The mutual conversion of e, cutting metal entity place and metal blank space: when entity place that burning torch is cut to workpiece once more during the stage, the action of repeating step c is if run into blank space, the then action of duplication stages d once more;
F, cutting done state: unclamp the cutting switch; The detection signal circuit sends to power control with detected cutting switching signal, and power control turn-offs cutting loop and striking loop, after the nozzle cooling; When pressing the cutting switch once more, power control turn-offs gas circuit.
Wherein, Power control comprises three-phase AC380V input, elementary three phase rectifier module, power factor correction module and the half-bridge inversion circuit module that connects successively; The half-bridge inversion circuit module is connected with the secondary commutation circuit module through transformer T; The input on the former limit of transformer T is equipped with Hall current sensor H2, and the secondary commutation circuit module is connected with the arc ignition circuit module;
The half-bridge inversion circuit module comprises the capacitor C 1 and capacitor C 2 that is connected in series with power factor correction module; Be parallel with resistance R 3 on the capacitor C 1; Be parallel with resistance R 4 on the capacitor C 2; IGBT pipe Q2 and IGBT manage between the negative electrode of the anode that is connected in parallel on capacitor C 1 after Q3 connects and capacitor C 2; Be connected with diode D1 between the emitter and collector on the IGBT pipe Q2, be connected with diode D2 between the emitter and collector of IGBT pipe Q3;
The arc ignition circuit module comprises the IGBT pipe Q4 that is connected with the anode of secondary commutation circuit module; The emitter stage of IGBT pipe Q4 is used to constitute the striking loop; The colelctor electrode of IGBT pipe Q4 is used to constitute cutting loop; Hall current sensor H4 is installed on the striking loop, Hall current sensor H3 is installed on the cutting loop;
The control circuit module comprises dsp controller; Dsp controller is connected with Hall current sensor H2, Hall current sensor H3 and Hall current sensor H4 signal, and dsp controller also is connected with IGBT pipe Q2, IGBT pipe Q3 and IGBT pipe Q4 through the HCPL316 drive plate.
Especially, among the step b, the detection signal circuit sends to dsp controller with detected cutting switching signal, and dsp controller drives IGBT pipe Q4 conducting; Dsp controller control gas circuit air feed, and IGBT is managed voltage duty cycle that Q2 and IGBT manage Q3 be controlled in 20%～30% the scope, arcing voltage is 300 ± 20V between nozzle 9 and the workpiece 10;
Among the step c; After the cutting loop conducting; Hall current sensor H3 is sent to dsp controller with the current signal in the cutting loop that records, and dsp controller turn-offs IGBT pipe Q4, and IGBT is managed voltage duty cycle that Q2 and IGBT manage Q3 is controlled in 35%～45% the scope;
In the steps d, cutting loop closes has no progeny, and Hall current sensor H3 is sent to dsp controller with the current signal in the cutting loop that records, and dsp controller drives IGBT pipe Q4 conducting, and the voltage duty cycle of adjusting IGBT pipe Q2 and IGBT pipe Q3 is 20%～30%;
Among the step f, after the detection signal circuit sent to dsp controller with detected cutting switching signal, dsp controller turn-offed said IGBT pipe Q2, IGBT pipe Q3 and IGBT pipe Q4.
A kind of air plasma cutter of the present invention cuts the anti-current interruption cutting method of latticed metal; Utilize the inventive method when the latticed metalwork of cutting, not need frequent current interruption; Electric arc conversion automatically between transfevent arc and non-transfevent arc automatically; Thereby protected the consumable accessory of cutting machine effectively, prolonged its service life.Help economizing on the use of funds, improved the operating efficiency in the cutting process simultaneously greatly.
Description of drawings
Fig. 1 is the circuit diagram of the power control that utilizes of the present invention;
Waveform figure when Fig. 2 is to use the inventive method to cut latticed metal; Wherein, Fig. 2 .1 is the IGBT pipe conducting of Q4 under each duty and the oscillogram of shutoff; Fig. 2 .2 is the oscillogram of electric current under each duty in the arc ignition circuit; Fig. 2 .3 is the conducting of gas circuit under each duty and the oscillogram of shutoff, and Fig. 2 .4 is the oscillogram of electric current under each duty in the clipper circuit.
Wherein, 1. three-phase AC380V input, 2. elementary three phase rectifier module, 3. power factor correction module, 4. half-bridge inversion circuit module, 5. secondary commutation circuit module, 6. arc ignition circuit module, 7. control circuit module, 8. electrode, 9. nozzle, 10. workpiece.
The specific embodiment
A kind of air plasma cutter of the present invention cuts the anti-current interruption cutting method of latticed metal; The device of this method utilization comprises burning torch and is connected the power control on the burning torch; Burning torch is provided with the gas circuit of be used to blow off this burning torch top nozzle 9 and electrode 8; Power control comprises the striking loop that is used for the cutting loop that is connected with workpiece 10 and is used for being connected with nozzle 9, also is connected with the detection signal circuit that is used to detect the cutting switching signal between the cutting switch of burning torch and the power control.
As shown in Figure 1; Power control comprises three-phase AC380V input 1, elementary three phase rectifier module 2, power factor correction module 3 and the half-bridge inversion circuit module 4 that connects successively; Half-bridge inversion circuit module 4 is connected with secondary commutation circuit module 5 through transformer T; The input on the former limit of transformer T is equipped with Hall current sensor H2, and secondary commutation circuit module 5 is connected with arc ignition circuit module 6.
The circuit of elementary three phase rectifier module 2 is connected to; The negative sense of the forward of the negative sense of the forward of the negative sense of the forward of diode VD1 and diode VD4, diode VD2 and diode VD5 and diode VD3 and diode VD6 correspondence respectively is connected on the triple line of said AC380V input 1; Diode VD1, diode VD2 and the negative sense of diode VD3 are connected, and diode VD4, diode VD5 and the forward of diode VD6 are connected.Three-phase AC380V input 1 is through elementary three phase rectifier module 2 output direct current 537V.
Power factor correction module 3 comprises the inductance L 1 that is connected with elementary three phase rectifier module 2; Inductance L 1 and IGBT pipe Q1 series connection; Be connected with diode D on the colelctor electrode of IGBT pipe Q1, resistance R 1 be connected in parallel on diode D after resistance R 2 is connected and IGBT manages between the emitter stage of Q1.The input of power factor correction module 3 is equipped with Hall current sensor H1.
Half-bridge inversion circuit module 4 comprises the capacitor C 1 and capacitor C 2 that is connected in series with power factor correction module 3; Be parallel with resistance R 3 on the capacitor C 1; Be parallel with resistance R 4 on the capacitor C 2; IGBT pipe Q2 and IGBT manage between the negative electrode of the anode that is connected in parallel on capacitor C 1 after Q3 connects and capacitor C 2; Be connected with diode D1 between the emitter and collector on the IGBT pipe Q2, be connected with diode D2 between the emitter and collector of IGBT pipe Q3.
The input on the former limit of transformer T is equipped with Hall current sensor H2.One end on the former limit of power transformation device T is connected on the emitter stage of IGBT pipe Q2, and the other end on the former limit of power transformation device T is connected between capacitor C 1 and the capacitor C 2.Secondary commutation circuit module 5 comprises diode VD11, diode VD22, diode VD33 and diode VD44; The negative sense of the forward of diode VD11 and diode VD33 all is connected with an end of power transformation device T secondary; The negative sense of the forward of diode VD22 and diode VD44 all is connected with the other end of power transformation device T secondary; Diode VD11 is connected with the negative sense of diode VD22; Be in series with inductance L 2 after the forward of diode VD33 and diode VD44 is connected, inductance L 2 strobes.
Arc ignition circuit module 6 comprises the IGBT pipe Q4 that is connected with the anode of secondary commutation circuit module 5; The emitter stage of IGBT pipe Q4 is used to constitute the striking loop; The colelctor electrode of IGBT pipe Q4 is used to constitute cutting loop; Wherein, The emitter stage of IGBT pipe Q4 is connected with nozzle 9 and constitutes the striking loop; Hall current sensor H4 is installed on the striking loop, and the colelctor electrode of IGBT pipe Q4 is connected with workpiece 10 and constitutes cutting loop, and Hall current sensor H3 is installed on the cutting loop.The electrode 8 of burning torch is connected with the negative electrode of secondary commutation circuit module 5.
As shown in Figure 2, this method may further comprise the steps:
A, original state: 8 short circuits are connected nozzle 9 with electrode, and no electric arc produces between nozzle 9 and the workpiece 10.
B, striking state: press the cutting switch, the detection signal circuit sends to dsp controller with detected cutting switching signal, and dsp controller drives IGBT pipe Q4 conducting, so that the conducting of striking loop; Dsp controller control gas circuit air feed is when utilizing the air thrust that nozzle 9 is separated with electrode 8; The voltage duty cycle that dsp controller is managed Q2 and IGBT pipe Q3 with IGBT is controlled in 20%～30% the scope, so that have the arcing voltage of 300 ± 20V between nozzle 9 and the workpiece 10.Like this, with after electrode 8 separates, moment produces electric arc between nozzle 9 and the workpiece 10 at said nozzle 9; At this moment, electric arc is non-transfevent arc (arc that forms when promptly not cutting), and non-transfevent arc needs less energy; Therefore, the size of current of this electric arc is 20A～25A, keeps this electric arc and does not go out.
The stage at c, initial cut metal solid place: when nozzle 9 begins to cut near the entity place of workpiece 10; Electric current skyrockets in the cutting loop; The cutting loop conducting; Hall current sensor H3 is sent to dsp controller with the current signal in the cutting loop that records; Dsp controller turn-offs IGBT pipe Q4, so that the striking loop is when turn-offing, dsp controller is managed Q2 with IGBT and is adjusted to 35%～45% with the voltage duty cycle that IGBT manages Q3; Make arc current remain on 30A～100A, pilot arc does not go out.At this moment; Electric arc becomes transfevent arc (arc that forms when being cut workpiece) by non-transfevent arc; Cut metal through the transfevent arc this moment; Need bigger energy; PWM wave control signal through the big voltage duty cycle of DSP output; Control IGBT pipe Q2 and the big electric current of IGBT pipe Q3 output cut metal to guarantee the transfevent arc continuously.Wherein, during the conducting of adjustment IGBT pipe Q2 and IGBT pipe Q3, voltage duty cycle is big more, and half-bridge inversion circuit output energy is many more, thereby makes arc current big more.
The stage of d, cutting metal blank space: when nozzle 9 is cut to the blank space of workpiece 10; The cutting loop electric current is reduced to cutting loop suddenly and is turn-offed; Simultaneously; Hall current sensor H3 is sent to dsp controller with the current signal in the cutting loop that records; Dsp controller drives IGBT pipe Q4 conducting, the conducting of striking loop, and the voltage duty cycle of adjusting IGBT pipe Q2 and IGBT pipe Q3 is 20%～30%; Make arc current remain on 20A～25A, pilot arc does not go out.At this moment, electric arc becomes non-transfevent arc by the transfevent arc, and circuit reenters the striking state.
The mutual conversion of e, cutting metal entity place and metal blank space: when entity place that burning torch is cut to said workpiece 10 once more during the stage, the action of repeating step c is if run into blank space, the then action of duplication stages d once more.So repeat, latticed metal is cut continuously, in cutting process, guarantee that electric arc is continuous, increase work efficiency.
F, cutting done state: unclamp the cutting switch; The detection signal circuit sends to dsp controller with detected cutting switching signal; Dsp controller turn-offs IGBT pipe Q2, IGBT pipe Q3 and IGBT pipe Q4; Cutting loop and striking loop are turn-offed; After nozzle 9 coolings; When pressing the cutting switch once more, the DSP control circuit turn-offs gas circuit.
Claims (3)
1. anti-current interruption cutting method that air plasma cutter cuts latticed metal; It is characterized in that; This method is utilized a kind of device; This device comprise burning torch and be connected with said burning torch power control; Said burning torch is provided with the gas circuit of be used to blow off this burning torch top nozzle (9) and electrode (8); Said power control comprises and is used for the cutting loop that is connected with workpiece (10); And be used for the striking loop that is connected with said nozzle (9), also be connected with the detection signal circuit that is used to detect said cutting switching signal between the cutting switch of said burning torch and the said power control;
This method may further comprise the steps:
A, original state: short circuit is connected said nozzle (9) with said electrode (8), and no electric arc produces between said nozzle (9) and the said workpiece (10);
B, striking state: press said cutting switch; Said detection signal circuit sends to said power control with detected cutting switching signal; Said power control is controlled said striking loop conducting; And control said gas circuit air feed; Utilize the air thrust to make said nozzle (9) and said electrode (8) when separating; Produce electric arc between said nozzle (9) and the said workpiece (10), the size of current of this electric arc remains on 20A～25A, and pilot arc does not go out;
The stage at c, initial cut metal solid place: when the entity place of the approaching said workpiece (10) of said nozzle (9) begins to cut; Said cutting loop conducting; Said power control turn-offs said striking loop, and makes arc current remain on 30A～100A, and pilot arc does not go out;
The stage of d, cutting metal blank space: when said nozzle (9) is cut to the blank space of said workpiece (10); Said cutting loop electric current turn-offs; The said striking of said power control conducting loop, and make the size of current of electric arc remain on 20A～25A, pilot arc does not go out;
The mutual conversion of e, cutting metal entity place and metal blank space: when entity place that burning torch is cut to said workpiece (10) the once more during stage, the action of repeating step c is if run into blank space, the then action of duplication stages d once more;
F, cutting done state: unclamp said cutting switch; Said detection signal circuit sends to said power control with detected cutting switching signal; Said power control turn-offs said cutting loop and said striking loop; After said nozzle (9) cooling; When pressing said cutting switch once more, said power control turn-offs gas circuit.
2. cut the anti-current interruption cutting method of latticed metal according to the said a kind of air plasma cutter of claim 1; It is characterized in that; Said power control comprises the three-phase AC380V input (1) that connects successively; Elementary three phase rectifier module (2); Power factor correction module (3) and half-bridge inversion circuit module (4); Said half-bridge inversion circuit module (4) is connected with secondary commutation circuit module (5) through transformer T; The input on the former limit of said transformer T is equipped with Hall current sensor H2, and said secondary commutation circuit module (5) is connected with arc ignition circuit module (6);
Said half-bridge inversion circuit module (4) comprises the capacitor C 1 and capacitor C 2 that is connected in series with said power factor correction module (3); Be parallel with resistance R 3 on the said capacitor C 1; Be parallel with resistance R 4 on the said capacitor C 2; IGBT pipe Q2 and IGBT manage between the negative electrode of the anode that is connected in parallel on said capacitor C 1 after Q3 connects and said capacitor C 2; Be connected with diode D1 between the emitter and collector on the said IGBT pipe Q2, be connected with diode D2 between the emitter and collector of said IGBT pipe Q3;
Said arc ignition circuit module (6) comprises the IGBT pipe Q4 that is connected with the anode of said secondary commutation circuit module (5); The emitter stage of said IGBT pipe Q4 is used to constitute said striking loop; The colelctor electrode of said IGBT pipe Q4 is used to constitute said cutting loop; Said striking is equipped with Hall current sensor H4 on the loop, and Hall current sensor H3 is installed on the said cutting loop;
Said control circuit module (7) comprises dsp controller; Said dsp controller is connected with said Hall current sensor H2, Hall current sensor H3 and Hall current sensor H4 signal, and said dsp controller also is connected with said IGBT pipe Q2, IGBT pipe Q3 and IGBT pipe Q4 through the HCPL316 drive plate.
3. cut the anti-current interruption cutting method of latticed metal according to the said a kind of air plasma cutter of claim 2, it is characterized in that,
Among the step b, said detection signal circuit sends to said dsp controller with detected cutting switching signal, and said dsp controller drives said IGBT pipe Q4 conducting; Said dsp controller is controlled said gas circuit air feed, and the voltage duty cycle that said IGBT pipe Q2 and IGBT manage Q3 is controlled in 20%～30% the scope, and arcing voltage is 300 ± 20V between said nozzle (9) and the said workpiece (10);
Among the step c; After the said cutting loop conducting; Said Hall current sensor H3 is sent to said dsp controller with the current signal in the cutting loop that records; Said dsp controller turn-offs said IGBT pipe Q4, and the voltage duty cycle that said IGBT pipe Q2 and IGBT manage Q3 is controlled in 35%～45% the scope;
In the steps d; Said cutting loop closes has no progeny; Said Hall current sensor H3 is sent to said dsp controller with the current signal in the cutting loop that records, and said dsp controller drives IGBT pipe Q4 conducting, and to regulate said IGBT pipe Q2 be 20%～30% with the voltage duty cycle that IGBT manages Q3;
Among the step f, after said detection signal circuit sent to said dsp controller with detected cutting switching signal, said dsp controller turn-offed said IGBT pipe Q2, IGBT pipe Q3 and IGBT pipe Q4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100899381A CN102350579A (en) | 2011-04-11 | 2011-04-11 | Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal |
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| CN2011100899381A CN102350579A (en) | 2011-04-11 | 2011-04-11 | Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104969665A (en) * | 2012-12-04 | 2015-10-07 | 欧瑞康美科股份公司，沃伦 | Method and control device for operating a plasma generation device |
| CN105618911A (en) * | 2015-11-20 | 2016-06-01 | 唐山松下产业机器有限公司 | Inverter plasma cutter and control method thereof at arc striking stage |
| CN108031960A (en) * | 2017-12-07 | 2018-05-15 | 深圳市佳士科技股份有限公司 | A kind of constant current arc-maintaining device and cutting machine |
| CN108296616A (en) * | 2017-12-29 | 2018-07-20 | 上海广为焊接设备有限公司 | Repeatable arc strike control device |
| CN109802577A (en) * | 2019-02-27 | 2019-05-24 | 延边中谷领创电力科技有限公司 | Plasma electric source device |
| CN111331233A (en) * | 2020-03-29 | 2020-06-26 | 吴忠市黄河电焊机有限公司 | Arc breakage prevention protection device based on high-power plasma cutting |
| CN111531258A (en) * | 2020-05-15 | 2020-08-14 | 世强先进(深圳)科技股份有限公司 | Plasma cutting machine with double-way gas supply pipeline |
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Cited By (14)
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|---|---|---|---|---|
| CN104969665B (en) * | 2012-12-04 | 2018-04-13 | 欧瑞康美科股份公司，沃伦 | For running the method and control device of plasma generating device |
| CN104969665A (en) * | 2012-12-04 | 2015-10-07 | 欧瑞康美科股份公司，沃伦 | Method and control device for operating a plasma generation device |
| US9756713B2 (en) | 2012-12-04 | 2017-09-05 | Oerliken Metco Ag, Wohlen | Method and control unit for operating a plasma generation apparatus |
| CN105618911B (en) * | 2015-11-20 | 2019-02-01 | 唐山松下产业机器有限公司 | Inversion plasma cutting machine and its control method in striking stage |
| CN105618911A (en) * | 2015-11-20 | 2016-06-01 | 唐山松下产业机器有限公司 | Inverter plasma cutter and control method thereof at arc striking stage |
| CN108031960A (en) * | 2017-12-07 | 2018-05-15 | 深圳市佳士科技股份有限公司 | A kind of constant current arc-maintaining device and cutting machine |
| CN108031960B (en) * | 2017-12-07 | 2023-06-23 | 深圳市佳士科技股份有限公司 | Constant-current arc maintaining device and cutting machine |
| CN108296616A (en) * | 2017-12-29 | 2018-07-20 | 上海广为焊接设备有限公司 | Repeatable arc strike control device |
| CN108296616B (en) * | 2017-12-29 | 2020-05-15 | 上海广为焊接设备有限公司 | Repeatable arc striking control device |
| CN109802577A (en) * | 2019-02-27 | 2019-05-24 | 延边中谷领创电力科技有限公司 | Plasma electric source device |
| CN111331233A (en) * | 2020-03-29 | 2020-06-26 | 吴忠市黄河电焊机有限公司 | Arc breakage prevention protection device based on high-power plasma cutting |
| CN111331233B (en) * | 2020-03-29 | 2022-01-11 | 吴忠市黄河电焊机有限公司 | Arc breakage prevention protection device based on high-power plasma cutting |
| CN111531258A (en) * | 2020-05-15 | 2020-08-14 | 世强先进(深圳)科技股份有限公司 | Plasma cutting machine with double-way gas supply pipeline |
| CN111531258B (en) * | 2020-05-15 | 2022-01-11 | 世强先进(深圳)科技股份有限公司 | Plasma cutting machine with double-way gas supply pipeline |
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Application publication date: 20120215 |