CN106141395B - Step-down type dc plasma power supply cutting method - Google Patents
Step-down type dc plasma power supply cutting method Download PDFInfo
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- CN106141395B CN106141395B CN201610666780.2A CN201610666780A CN106141395B CN 106141395 B CN106141395 B CN 106141395B CN 201610666780 A CN201610666780 A CN 201610666780A CN 106141395 B CN106141395 B CN 106141395B
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- power supply
- plasma power
- gas
- cutting
- chopper
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
Abstract
The present invention provides a kind of step-down type dc plasma power supply cutting methods, including power-up initializing, purging, the in advance basic steps such as stream, striking, shifting arc, up-flow, cutting, drop stream, cutout, shutdown, reset and test.The present invention also provides error checking and real time protection, so that plasma power supply cutter system can take measures to change or realize to shut down when the error occurs.Method proposed by the present invention, process structure are simplified, clear logic, and the plasma power supply that maximum output current is 270A may be implemented and cut, work well, practical.
Description
Technical field
The present invention relates to plasma power supplies to cut field, and in particular, to a kind of step-down type dc plasma power supply cutting
Method.
Background technique
Plasma cut is the metal part or local melting for making workpiece incision using the heat of high-temperature plasma electric arc
(and evaporation), and the momentum of high speed plasma is borrowed to exclude molten metal to form a kind of processing method of notch.Plasma cut
Technology efficiently to have the tendency that its application in the industry more more and more universal, and the process flow about plasma cut is at this
It is a critically important ring in technology.
However, found by retrieval to the prior art, very to the research of direct current plasma power supply cutting technique process
It is few.The research of direct current plasma power supply cutting is mainly concentrated in, output voltage electric current control and how to improve
Starting the arc success rate etc..Liu it is precious its et al. proposed on " Proceedings of the CSEE " in 2011 and a kind of there is instruction electricity
The double-loop control strategy for flowing the electric current outer ring voltage inter-loop of feedforward, by establishing the equivalent mathematical model of cutting power supply, to double
Closed-loop system has carried out frequency-domain analysis and design, overcomes the shortcomings that being likely to occur striking failure under traditional mode, inhibits simultaneously
The disturbance of broaching load；Sun Qiang et al. establishes the mathematical model of plasma-arc in " welding journal " in 2014, mentions
Go out a kind of NEW TYPE OF COMPOSITE control strategy, meets control of the power supply under non-high-frequency arc strike loading condition to rapidity and stability
Demand processed.In terms of patent retrieval, Central China University of Science and Technology woods birch et al. proposes a kind of digitlization plasma cutting machine control system
System, by the coordinated control between main power source, gas system, cooling system, is realized entire using DSP as control centre
The general function of plasma cut machine control system.
In conclusion at present to direct current plasma power supply cutting research be mainly concentrated in output voltage electric current into
Row control and how to improve starting the arc success rate etc., it is very few to the research of plasma cutting process process.But with this
Meanwhile plasma cutting process process is the link that plasma cutting technique is not walked around.With plasma cut skill
How the application and popularization of art determine that plasma cutting process process has been increasingly becoming a new research direction.
Summary of the invention
For existing about plasma cutting technique, the present invention provides a kind of cuttings of step-down type dc plasma power supply
Method.
The present invention provides a kind of step-down type dc plasma power supply cutting method, including it is power-up initializing, purging, pre-
Stream, striking, shifting arc, up-flow, cutting, drop stream, cutout, shutdown, reset and test and etc..Method also provides for error checking
And real time protection, to take measures to change when system errors or realize and shut down.
Step-down type dc plasma power supply cutting method provided by the invention, includes the following steps:
Step S1, the power-up initializing of plasma power supply cutter system.
Preferably, step S1 includes the following steps:
When powering and powering on to plasma power supply cutter system, plasma power supply cutting machine BUCK DC-DC transformation
The controller DSP of device (chopper) starts in a microprocessor mode, starts to execute journey in DSP external flash and DSP memory
Sequence code；The limited initialization of DSP hardware (I/O port that is used in initialization procedure, PWM mouthfuls, ADC mouthfuls, external interrupt and capture mouth,
Timer, software watchdog etc.)；Calculate DSP external flash and DSP memory verification and, will be outside DSP if verification and be not inconsistent
Procedure code in portion's flash memory copies in DSP memory；Control program skips to DSP memory, starts program code；
DSP hardware initializes comprehensively；EEPROM data are read, the cutting current setting that last time cutting is completed is obtained；
The serial information and CAN message for checking inside and outside UART Universal Asynchronous Receiver Transmitter, according to the information detected, and execute
Corresponding program action, the i.e. transmitting of information；Every 10ms checks primary information, judges whether mistake occur, and every 250ms refreshes display
The data of gas-operated platform, every 26ms update the chopper control loop of plasma power supply；In case of mistake or it is inconsistent, then
Update the analog input value of plasma power supply cutting machine digital control system；If cutting current setting value changes, update
Storing data in EEPROM；If the inlet gas of gas-operated platform changes, step S2 is executed, gas-operated platform is blown
It sweeps.
Preferably, step S1 further includes following steps:
Error checking: verifying whether starting the arc signal closes, and whether coolant flow when checking power-up is enough, checks whether there is
Plasma power chopper electric current.
Step S2, gas-operated platform purging.
Preferably, step S2 includes the following steps:
Coolant pump or cooling motor are connected, makes gas-operated platform that reserved gas be allowed to flow substantially 12s, completes to reserve
After circulation, verify whether coolant flow is enough, then the cutting gas of gas-operated platform is made to flow substantially 12s, in gas-operated
Before platform enters step the wait state of S3, starting the arc signal-off is verified.
Preferably, step S2 further includes following steps:
Error checking: if coolant flow is less than 1.1lpm, plasma power supply cutter system is closed, stops output
Cutting current；If coolant flow is less than 2.2lpm, continue pumping coolant, until flow is more than 2.2lpm, temporarily at this time
Do not allow to start gas-operated platform.
Step S3 is waited:
If plasma power supply cutter system activates starting the arc signal, gas-operated platform enters step the pre- stream mode of S4,
The contactor of plasma power supply cutter system is connected with soft start controller, and plasma power supply cutter system enters step S4
Pre- stream mode；If the serial line interface of gas-operated platform or plasma power supply cutter system requires change state, row is taken
It is dynamic to receive state change；8-12s is issued in last starting the arc signal, it is preferable that after issuing 10s, plasma power supply cutting machine system
System closes contactor and soft start controller, formally starts power up.
Preferably, step S3 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is electric current of chopper, verifies all temperature
Spend the whether below defined temperature limit of test point.
Step S4, pre- to flow:
The electric current of chopper value for setting plasma power supply is equal to guidance arc current, starts pre- stream, and wait pre- stream to terminate, excellent
Selection of land, if contactor is overtime, waiting the pre- stream end time is 2s, and otherwise the waiting pre- stream end time is set to 0.5s, and solves
Except pause signal, the i.e. pre- stream end process of waiting.
Preferably, step S4 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether line voltage is too high or too low, checks cold
But agent whether overtemperature, check plasma power supply cutting machine BUCK DC-DC converter (i.e. chopper) whether overtemperature, check transformation
Device whether overtemperature.
Step S5, striking:
Plasma power supply controller is connected and motion guiding arc controller and pilot arc relay, waits the delay of 50ms
Afterwards, plasma power supply controller, which issues HF (high frequency) pulse, makes pilot arc cut-off；If the chopper of plasma power supply
Electric current is equal to the half of guidance arc current, then plasma power supply controller closes HF (high frequency) pulse, completes striking process, process
Enter step the shifting arcuation state of S6；After if plasma power supply controller issues 10 HF (high frequency) pulses, still without plasma
The electric current of chopper of power supply, shows unusual condition occur, then enters step the closed state of S11.
Error checking: due to HF (high frequency) pulse noise, without error checking under this step.
Step S6 moves arc:
If active conductors electric current, i.e. cutting current are greater than transfer referring to electric current, process enters step the up-flow state of S7,
And close pilot arc controller and pilot arc relay；If process enters step still without arc transfer is completed after 500ms
The closed state of rapid S11；If electric current of chopper, i.e., cutting current is then connected out less than the half of electric current of chopper setting value
With HF (high frequency) pulse, it is intended to increase cutting current.
Error checking: due to HF (high frequency) pulse noise, without error checking under this step.
Step S7, up-flow:
If metal works perforation is completed, the input signal of plasma power supply controller, the work of gas-operated platform are closed
For pattern switching to cutting gas bulk-mode, the cutting current that edges up depends on different types of plasma power supply cutting machine lathe；One
Denier electric current of chopper (i.e. cutting current) is greater than or equal to electric current of chopper (i.e. cutting current) setting value, the work of gas-operated platform
Mode enters step the cut state of S8.
Preferably, step S7 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether line voltage is too high or too low, checks cold
But agent whether overtemperature, check chopper whether overtemperature, check transformer whether overtemperature.
Step S8, cutting:
If metal works perforation is completed, the input signal of plasma power supply controller, the work of gas-operated platform are closed
Pattern switching extremely cutting gas bulk-mode；Under cut state, if the corner current input signal of cutting workpiece has been switched on,
Then switch to corner current setting value；If the input of starting the arc signal is closed, process enters step the drop stream mode of S9.
Preferably, step S8 further includes following steps:
Error checking: checking whether phase shortage, and whether coolant flow when checking power-up is enough, checks whether line voltage is excessively high
Or it is too low, check coolant whether overtemperature, check plasma power supply cutting machine chopper whether overtemperature, check transformer whether surpass
Temperature shows that electric current is lost if practical plasma power supply cutting machine electric current of chopper is less than the half of electric current of chopper setting value
Careless mistake is missed, if plasma power supply cutting machine active conductors electric current is less than the half of current in wire setting value, display transfer is lost
Mistake.
Step S9, drop stream:
Different drop stream process is carried out according to different types of plasma power supply cutting machine lathe, according to the specific shape of lathe
Condition allows gas-operated platform operating mode to enter step the wait state or drop stream mode of S3, cuts once cutting current decline reaches
Only electric current, gas-operated platform operating mode enter final drop stream mode.
Preferably, step S9 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough.
Step S10, cutout:
It sets plasma power chopper electric current and is equal to zero.
Preferably, step S10 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough.
Step S11 is closed:
The machinery valve output of pilot arc relay, pilot arc controller, HF pulse and gas-operated platform is closed, so that
Reserved gas enters the rear stream phase of 10s (relative to the pre- stream phase)；If occurring closing mistake at this time, connects plasma power supply and cut
Cutting mill digital control system (CNC) closes mistake output；If occurring drop stream mistake at this time, plasma power supply cutting machine numerical control is connected
System (CNC) drop stream mistake output；Timer and contactor operation 10s are flowed afterwards enters step S3 if not having starting the arc signal
Wait state.
Preferably, step S11 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough.
Step S12 is shut down:
Gas-operated platform operating mode enters shutdown status, closes all outputs of gas-operated platform, opens plasma electric
The output of source cutting machine digital control system (CNC) mistake, electric current of chopper (cutting current) setting value are equal to zero, the waiting of gas-operated platform
Reset request from plasma power supply cutting machine digital control system (CNC).
Step S13 resets:
The CAN control of controller in plasma power supply cutting machine BUCK DC-DC converter (chopper) is resetted, and initial
Timer is flowed after change, gas-operated platform operating mode enters step the wait state of S3.
Preferably, further include following steps:
Step S14, test cutting stream:
The operation of gas-operated platform, circulation cutting gas body, and wait from plasma power supply cutting machine digital control system not
With request, gas-operated platform operating mode enters step the pre- stream mode of test of S15, or enters step the wait state of S3.
Preferably, step S14 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is starting the arc signal.
Step S15 tests pre- stream:
The operation of gas-operated platform, circulate pre- gas body, and waits the difference from plasma power supply cutting machine digital control system
Request, gas-operated platform operating mode enter step the test cutting stream mode of S14, or enter step the wait state of S3.
Preferably, step S15 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is starting the arc signal.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, step-down type dc plasma power supply cutting method provided by the invention illustrates each tool needed to be implemented
Body step provides complete set and detailed process for plasma power supply cutting technique, is plasma power supply cutting technique
It is applied clinically and popularized and popularizes and play certain effect.
2, the present invention both provides error checking in many steps and implements defencive function, so that plasma power supply is cut
The work of machine system can be more reliable and more stable.
3, method proposed by the present invention, process structure are simplified, clear logic, and maximum output current may be implemented and be
The plasma power supply of 270A is cut, and is worked well, practical.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the process flow sketch map of step-down type dc plasma power supply cutting method provided by the invention.
Fig. 2 is plasma power supply cutter system configuration schematic diagram.
In figure: 1 is plasma power supply, and 2 be striking case, and 3 be Pneumatic controlled box, and 4 be valve group, and 5 be hand-held remote controller, and 6 be outside
Remote control cable, 7 be cutting torch Height-adjusting device, and 8 be digital control system CNC, and 9 be workpiece.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
The present invention provides a kind of step-down type dc plasma power supply cutting method, including it is power-up initializing, purging, pre-
Stream, striking, shifting arc, up-flow, cutting, drop stream, cutout, shutdown, reset and test and etc..Method also provides for error checking
And real time protection, to take measures to change when system errors or realize and shut down.The main step of entire method
It is rapid as follows:
Step S1, the power-up initializing of plasma power supply cutter system.
Preferably, step S1 includes the following steps:
When powering and powering on to plasma power supply cutter system, plasma power supply cutting machine BUCK DC-DC transformation
The controller DSP of device (chopper) starts in a microprocessor mode, starts to execute journey in DSP external flash and DSP memory
Sequence code；The limited initialization of DSP hardware (I/O port that is used in initialization procedure, PWM mouthfuls, ADC mouthfuls, external interrupt and capture mouth,
Timer, software watchdog etc.)；Calculate DSP external flash and DSP memory verification and, will be outside DSP if verification and be not inconsistent
Procedure code in portion's flash memory copies in DSP memory；Control program skips to DSP memory, starts program code；
DSP hardware initializes comprehensively；EEPROM data are read, the cutting current setting that last time cutting is completed is obtained；
The serial information and CAN message for checking inside and outside UART Universal Asynchronous Receiver Transmitter, according to the information detected, and execute
Corresponding program action, the i.e. transmitting of information；Every 10ms checks primary information, judges whether mistake occur, and every 250ms refreshes display
The data of gas-operated platform, every 26ms update the chopper control loop of plasma power supply；In case of mistake or it is inconsistent, then
Update the analog input value of plasma power supply cutting machine digital control system；If cutting current setting value changes, update
Storing data in EEPROM；If the inlet gas of gas-operated platform changes, step S2 is executed, gas-operated platform is blown
It sweeps.
Preferably, step S1 further includes following steps:
Error checking: verifying whether starting the arc signal closes, and whether coolant flow when checking power-up is enough, checks whether there is
Plasma power chopper electric current.
Step S2, gas-operated platform purging.
Preferably, step S2 includes the following steps:
Coolant pump or cooling motor are connected, makes gas-operated platform that reserved gas be allowed to flow substantially 12s, completes to reserve
After circulation, verify whether coolant flow is enough, then the cutting gas of gas-operated platform is made to flow substantially 12s, in gas-operated
Before platform enters step the wait state of S3, starting the arc signal-off is verified.
Preferably, step S2 further includes following steps:
Error checking: if coolant flow is less than 1.1lpm, plasma power supply cutter system is closed, stops output
Cutting current；If coolant flow is less than 2.2lpm, continue pumping coolant, until flow is more than 2.2lpm, temporarily at this time
Do not allow to start gas-operated platform.
Step S3 is waited:
If plasma power supply cutter system activates starting the arc signal, gas-operated platform enters step the pre- stream mode of S4,
The contactor of plasma power supply cutter system is connected with soft start controller, and plasma power supply cutter system enters step S4
Pre- stream mode；If the serial line interface of gas-operated platform or plasma power supply cutter system requires change state, row is taken
It is dynamic to receive state change；8-12s is issued in last starting the arc signal, it is preferable that after issuing 10s, plasma power supply cutting machine system
System closes contactor and soft start controller, formally starts power up.
Preferably, step S3 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is electric current of chopper, verifies all temperature
Spend the whether below defined temperature limit of test point.
Step S4, pre- to flow:
The electric current of chopper value for setting plasma power supply is equal to guidance arc current, starts pre- stream, and wait pre- stream to terminate, excellent
Selection of land, if contactor is overtime, waiting the pre- stream end time is 2s, and otherwise the waiting pre- stream end time is set to 0.5s, and solves
Except pause signal, the i.e. pre- stream end process of waiting.
Preferably, step S4 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether line voltage is too high or too low, checks cold
But agent whether overtemperature, check plasma power supply cutting machine BUCK DC-DC converter (i.e. chopper) whether overtemperature, check transformation
Device whether overtemperature.
Step S5, striking:
Plasma power supply controller is connected and motion guiding arc controller and pilot arc relay, waits the delay of 50ms
Afterwards, plasma power supply controller, which issues HF (high frequency) pulse, makes pilot arc cut-off；If the chopper of plasma power supply
Electric current is equal to the half of guidance arc current, then plasma power supply controller closes HF (high frequency) pulse, completes striking process, process
Enter step the shifting arcuation state of S6；After if plasma power supply controller issues 10 HF (high frequency) pulses, still without plasma
The electric current of chopper of power supply, shows unusual condition occur, then enters step the closed state of S11.
Error checking: due to HF (high frequency) pulse noise, without error checking under this step.
Step S6 moves arc:
If active conductors electric current, i.e. cutting current are greater than transfer referring to electric current, process enters step the up-flow state of S7,
And close pilot arc controller and pilot arc relay；If process enters step still without arc transfer is completed after 500ms
The closed state of rapid S11；If electric current of chopper, i.e., cutting current is then connected out less than the half of electric current of chopper setting value
With HF (high frequency) pulse, it is intended to increase cutting current.
Error checking: due to HF (high frequency) pulse noise, without error checking under this step.
Step S7, up-flow:
If metal works perforation is completed, the input signal of plasma power supply controller, the work of gas-operated platform are closed
For pattern switching to cutting gas bulk-mode, the cutting current that edges up depends on different types of plasma power supply cutting machine lathe；One
Denier electric current of chopper (i.e. cutting current) is greater than or equal to electric current of chopper (i.e. cutting current) setting value, the work of gas-operated platform
Mode enters step the cut state of S8.
Preferably, step S7 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether line voltage is too high or too low, checks cold
But agent whether overtemperature, check chopper whether overtemperature, check transformer whether overtemperature.
Step S8, cutting:
If metal works perforation is completed, the input signal of plasma power supply controller, the work of gas-operated platform are closed
Pattern switching extremely cutting gas bulk-mode；Under cut state, if the corner current input signal of cutting workpiece has been switched on,
Then switch to corner current setting value；If the input of starting the arc signal is closed, process enters step the drop stream mode of S9.
Preferably, step S8 further includes following steps:
Error checking: checking whether phase shortage, and whether coolant flow when checking power-up is enough, checks whether line voltage is excessively high
Or it is too low, check coolant whether overtemperature, check plasma power supply cutting machine chopper whether overtemperature, check transformer whether surpass
Temperature shows that electric current is lost if practical plasma power supply cutting machine electric current of chopper is less than the half of electric current of chopper setting value
Careless mistake is missed, if plasma power supply cutting machine active conductors electric current is less than the half of current in wire setting value, display transfer is lost
Mistake.
Step S9, drop stream:
Different drop stream process is carried out according to different types of plasma power supply cutting machine lathe, according to the specific shape of lathe
Condition allows gas-operated platform operating mode to enter step the wait state or drop stream mode of S3, cuts once cutting current decline reaches
Only electric current, gas-operated platform operating mode enter final drop stream mode.
Preferably, step S9 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough.
Step S10, cutout:
It sets plasma power chopper electric current and is equal to zero.
Preferably, step S10 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough.
Step S11 is closed:
The machinery valve output of pilot arc relay, pilot arc controller, HF pulse and gas-operated platform is closed, so that
Reserved gas enters the rear stream phase of 10s (relative to the pre- stream phase)；If occurring closing mistake at this time, connects plasma power supply and cut
Cutting mill digital control system (CNC) closes mistake output；If occurring drop stream mistake at this time, plasma power supply cutting machine numerical control is connected
System (CNC) drop stream mistake output；Timer and contactor operation 10s are flowed afterwards enters step S3 if not having starting the arc signal
Wait state.
Preferably, step S11 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough.
Step S12 is shut down:
Gas-operated platform operating mode enters shutdown status, closes all outputs of gas-operated platform, opens plasma electric
The output of source cutting machine digital control system (CNC) mistake, electric current of chopper (cutting current) setting value are equal to zero, the waiting of gas-operated platform
Reset request from plasma power supply cutting machine digital control system (CNC).
Step S13 resets:
The CAN control of controller in plasma power supply cutting machine BUCK DC-DC converter (chopper) is resetted, and initial
Timer is flowed after change, gas-operated platform operating mode enters step the wait state of S3.
Preferably, further include following steps:
Step S14, test cutting stream:
The operation of gas-operated platform, circulation cutting gas body, and wait from plasma power supply cutting machine digital control system not
With request, gas-operated platform operating mode enters step the pre- stream mode of test of S15, or enters step the wait state of S3.
Preferably, step S14 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is starting the arc signal.
Step S15 tests pre- stream:
The operation of gas-operated platform, circulate pre- gas body, and waits the difference from plasma power supply cutting machine digital control system
Request, gas-operated platform operating mode enter step the test cutting stream mode of S14, or enter step the wait state of S3.
Preferably, step S15 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is starting the arc signal.
Step-down type dc plasma power supply cutting method provided in this embodiment, by power-up initializing, purging, pre- stream,
Striking, move arc, up-flow, cutting, drop stream, cutout, shut down, resetting and test and etc. and error checking and real-time guard function
Can, so that plasma power supply cutter system can take measures to change or realize to shut down when the error occurs.The present embodiment proposes
Method, process structure simplifies, clear logic, and the plasma power supply that maximum output current is 270A may be implemented and cut
It cuts, works well, it is practical.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (7)
1. a kind of step-down type dc plasma power supply cutting method, which comprises the steps of:
Step S1, the power-up initializing of plasma power supply cutter system；
Step S2, gas-operated platform purging；
Step S3 is waited:
If plasma power supply cutter system activates starting the arc signal, gas-operated platform enters step the pre- stream mode of S4, wait from
The contactor of sub- power supply cutter system is connected with soft start controller, and plasma power supply cutter system enters step the pre- of S4
Stream mode；If the serial line interface of gas-operated platform or plasma power supply cutter system requires change state, takes action and connect
Changed by state；After last starting the arc signal issues 8-12s, plasma power supply cutter system closes contactor and soft start
Controller formally starts power up；
Step S4, pre- to flow:
The electric current of chopper value for setting plasma power supply is equal to guidance arc current, starts pre- stream, and wait pre- stream to terminate, solves simultaneously
Except pause signal；
Step S5, striking:
Plasma power supply controller is connected and motion guiding arc controller and pilot arc relay, after the delay for waiting 50ms, etc.
Ion power supply controller, which issues HF pulse, makes pilot arc cut-off；If the electric current of chopper of plasma power supply is equal to guidance
The half of arc current, then plasma power supply controller closes HF pulse, completes striking process, and process enters step the shifting arcuation of S6
State；If, still without the electric current of chopper of plasma power supply, showing occur after plasma power supply controller issues 10 HF pulses
Unusual condition then enters step the closed state of S11；
Step S6 moves arc:
If active conductors electric current is greater than transfer referring to electric current, process enters step the up-flow state of S7, and closes pilot arc control
Device processed and pilot arc relay；If process enters step the closing shape of S11 still without arc transfer is completed after 500ms
State；If electric current of chopper is less than the half of electric current of chopper setting value, connects and issue HF pulse, to attempt to increase cutting electricity
Stream；
Step S7, up-flow:
If metal works perforation is completed, the input signal of plasma power supply controller, gas-operated platform operating mode are closed
Cutting gas bulk-mode is switched to, the cutting current that edges up depends on different types of plasma power supply cutting machine lathe；Once waiting
The electric current of chopper of ion power supply is greater than or equal to the electric current of chopper setting value of plasma power supply, gas-operated platform operating mode
Enter step the cut state of S8；
Step S8, cutting:
Under cut state, if the corner current input signal of cutting workpiece has been switched on, the setting of corner electric current is switched to
Value；If the input of starting the arc signal is closed, process enters step the drop stream mode of S9；
Step S9, drop stream:
Different drop stream process is carried out according to different types of plasma power supply cutting machine lathe, according to the specific situation of lathe, is allowed
Gas-operated platform operating mode enters step the wait state or drop stream mode of S3, once cutting current decline reaches cut-off electricity
Stream, gas-operated platform operating mode enter final drop stream mode；
Step S10, cutout:
The electric current of chopper for setting plasma power supply is equal to zero；
Step S11 is closed:
The machinery valve output for closing pilot arc relay, pilot arc controller, HF pulse and gas-operated platform, so that reserved
Gas enters the rear stream phase of 10s；If occurring closing mistake at this time, connects plasma power supply cutting machine digital control system and close mistake
Accidentally export；If occurring drop stream mistake at this time, the drop stream mistake output of plasma power supply cutting machine digital control system is connected；Stream is fixed afterwards
When device and contactor operation 10s if there is no starting the arc signal enter step the wait state of S3；
Step S12 is shut down:
Gas-operated platform operating mode enters shutdown status, closes all outputs of gas-operated platform, opens plasma power supply and cuts
The output of cutting mill digital control system mistake, the electric current of chopper setting value of plasma power supply are equal to zero, the waiting of gas-operated platform from etc.
The reset request of ion power supply cutting machine digital control system；
Step S13 resets:
The CAN control of controller in plasma power supply cutting machine chopper is resetted, and flows timer, gas-operated platform after initializing
Operating mode enters step the wait state of S3.
2. step-down type dc plasma power supply cutting method according to claim 1, which is characterized in that the step S1 packet
Include following steps:
When powering and powering on to plasma power supply cutter system, the controller DSP of plasma power supply cutting machine chopper exists
Start under microprocessor model, starts program code in DSP external flash and DSP memory；The limited initialization of DSP hardware；
Calculate DSP external flash and DSP memory verification and, if verification and be not inconsistent, the procedure code in DSP external flash is copied to
In DSP memory；Control program skips to DSP memory, starts program code；
DSP hardware initializes comprehensively；EEPROM data are read, the cutting current setting that last time cutting is completed is obtained；
The serial information and CAN message for checking inside and outside UART Universal Asynchronous Receiver Transmitter according to the information detected, and execute corresponding
Program action, the i.e. transmitting of information；Every 10ms checks primary information, judges whether mistake occur, and every 250ms refreshes display gas
The data of station, every 26ms update the chopper control loop of plasma power supply；In case of mistake or it is inconsistent, then update
The analog input value of plasma power supply cutting machine digital control system；If cutting current setting value changes, EEPROM is updated
In storing data；If the inlet gas of gas-operated platform changes, step S2 is executed.
3. step-down type dc plasma power supply cutting method according to claim 1, which is characterized in that the step S2 packet
Include following steps:
Coolant pump or cooling motor are connected, makes gas-operated platform that reserved gas be allowed to flow 12s, after completing reserved circulation,
Verify whether coolant flow is enough, then the cutting gas of gas-operated platform is made to flow 12s, enters step S3 in gas-operated platform
Wait state before, verify starting the arc signal-off.
4. step-down type dc plasma power supply cutting method according to claim 1, which is characterized in that the step S3
In, after last starting the arc signal issues 10s, plasma power supply cutter system closes contactor and soft start controller.
5. step-down type dc plasma power supply cutting method according to claim 1, which is characterized in that the step S4
In, if contactor is overtime, waiting the pre- stream end time is 2s, and otherwise the waiting pre- stream end time is set to 0.5s.
6. step-down type dc plasma power supply cutting method according to any one of claim 1 to 5, which is characterized in that
Further include following steps:
Step S14, test cutting stream:
The operation of gas-operated platform, circulation cutting gas body, and wait the difference from plasma power supply cutting machine digital control system and ask
It asks, gas-operated platform operating mode enters step the pre- stream mode of test of S15, or enters step the wait state of S3；
Step S15 tests pre- stream:
The operation of gas-operated platform, circulate pre- gas body, and waits the different requests from plasma power supply cutting machine digital control system,
Gas-operated platform operating mode enters step the test cutting stream mode of S14, or enters step the wait state of S3.
7. step-down type dc plasma power supply cutting method according to claim 6, which is characterized in that further include following appoint
Meaning one or any number of steps:
Step S1 further includes following steps:
Error checking: verifying whether starting the arc signal closes, and whether coolant flow when checking power-up enough, check whether there is etc. from
Sub- power supply electric current of chopper；
Step S2 further includes following steps:
Error checking: if coolant flow is less than 1.1lpm, closing plasma power supply cutter system, stops output cutting
Electric current；If coolant flow is less than 2.2lpm, continue pumping coolant, until flow is more than 2.2lpm, does not permit temporarily at this time
Perhaps start gas-operated platform；
Step S3 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is electric current of chopper, verifies all temperature and surveys
The whether below defined temperature limit of pilot；
Step S4 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether line voltage is too high or too low, checks coolant
Whether overtemperature, check plasma power supply cutting machine chopper whether overtemperature, check transformer whether overtemperature；
Step S7 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether line voltage is too high or too low, checks coolant
Whether overtemperature, check chopper whether overtemperature, check transformer whether overtemperature；
Step S8 further includes following steps:
Error checking: checking whether phase shortage, and whether coolant flow when checking power-up is enough, checks whether line voltage excessively high or mistake
It is low, check coolant whether overtemperature, check plasma power supply cutting machine chopper whether overtemperature, check transformer whether overtemperature,
If practical plasma power supply cutting machine electric current of chopper is less than the half of electric current of chopper setting value, it is wrong to show that electric current is lost
Accidentally, if plasma power supply cutting machine active conductors electric current is less than the half of current in wire setting value, mistake is lost in display transfer；
Step S9 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough；
Step S10 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough；
Step S11 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough；
Step S14 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is starting the arc signal；
Step S15 further includes following steps:
Error checking: whether coolant flow when checking power-up is enough, checks whether there is starting the arc signal.
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| CN201610666780.2A CN106141395B (en) | 2016-08-12 | 2016-08-12 | Step-down type dc plasma power supply cutting method |
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| CN201610666780.2A CN106141395B (en) | 2016-08-12 | 2016-08-12 | Step-down type dc plasma power supply cutting method |
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| CN106141395B true CN106141395B (en) | 2019-01-25 |
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| CN205093032U (en) * | 2012-10-18 | 2016-03-16 | 海别得公司 | Plasma arc cutting system |
| US9550251B2 (en) * | 2014-03-28 | 2017-01-24 | Hypertherm, Inc. | Power supply assembly for a plasma arc torch system |
| CN104625368B (en) * | 2014-12-04 | 2016-07-06 | 上海沪工焊接集团股份有限公司 | Inversion transferred arc formula cutting machine controls device |
| CN104889551B (en) * | 2015-06-15 | 2017-02-01 | 济南大学 | Electric current and gas control system and method of fine plasma cutting machine |
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