CN106903382B - A kind of type chamber electric spark machining working solution component monitoring system - Google Patents
A kind of type chamber electric spark machining working solution component monitoring system Download PDFInfo
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- CN106903382B CN106903382B CN201710123598.7A CN201710123598A CN106903382B CN 106903382 B CN106903382 B CN 106903382B CN 201710123598 A CN201710123598 A CN 201710123598A CN 106903382 B CN106903382 B CN 106903382B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a kind of type chamber electric spark machining working solution component monitoring systems, including gaseous mixture sample preparation unit, detector gas circuit unit, embedded control unit and computer digital animation unit；The gaseous mixture sample preparation unit includes that sequentially connected working solution sampling interface, degasser and gaseous mixture sample feeding device, the degasser and gaseous mixture sample feeding device are connected with embedded control unit respectively；The gaseous mixture sample feeding device is also connected with the detector gas circuit unit；The detector gas circuit unit is connected with the embedded control unit and computer digital animation unit respectively；It is connected between the embedded control unit and computer digital animation unit by fieldbus.
Description
Technical field
The present invention relates to type chamber spark erosion technique field, more particularly to a kind of type chamber electric spark machining working solution at
Divide monitoring system.
Background technique
Type chamber electrical discharge machining is based on the galvano-cautery phenomenon between tool and workpiece when pulse feature spark discharge come ablation
Extra metal, to reach the scheduled processing request of size, shape and surface quality to part.Guarantee process just
Often realizing must make often to keep certain discharging gap between tool-electrode and working solution finished surface first, and secondly spark is put
Electricity must be instantaneous pulsed discharge.And spark discharge must carry out in the liquid medium for having certain insulation performance, such as
Kerosene, saponification liquor etc. mix organic liquid medium.Liquid medium is also known as working solution, it must have higher dielectric strength, to have
Conducive to the spark discharge for generating pulse feature.Liquid medium can also be the small bits of metal, the carbon generated in edm process simultaneously
Black equal galvanic corrosion product suspends from discharging gap to be excluded, and has preferable cooling effect to electrode and workpiece surface.
Medium in type chamber edm process between tool and piece pole is logical by ionization, breakdown, formation electric discharge
Behind road, it is transformed into kinetic energy to process the electric energy provided, kinetic energy is by being transformed into thermal energy after collision again.Then in channel, it is positive and negative
Pole surface respectively becomes instant therm source, reaches very high temperature.High temperature first vaporizes work liquid medium in channel, and then hot tearing
It is cracked into hydrogen, carbon dioxide, certain hydrocarbon gas after decomposition gasification, such as kerosene hydrocarbon working solution high temperature and dissociates
Carbon etc..These decomposition products are dissolved in working solution causes the composition of working solution to change, it is therefore desirable to working solution at
Part carries out real-time monitoring.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of type chamber electric spark machining working solution component monitoring systems, real
Now to the analysis of mixed gas composition in electric spark machining working solution.
The technical solution adopted by the present invention to solve the technical problems is: provide a kind of type chamber electric spark machining working solution at
Divide at monitoring system, including gaseous mixture sample preparation unit, detector gas circuit unit, embedded control unit and computer data
Manage unit；The gaseous mixture sample preparation unit includes sequentially connected working solution sampling interface, degasser and mixing gas sample
Product sampling device, the degasser and gaseous mixture sample feeding device are connected with embedded control unit respectively；The mixing
Gas sample product sampling device is also connected with the detector gas circuit unit；The detector gas circuit unit respectively with the embedded control
Unit processed is connected with computer digital animation unit；Pass through between the embedded control unit and computer digital animation unit
Fieldbus is connected.
The working solution sampling interface is the sampling interface agency of two-way operation liquid, by ablation particle filter, electric three passes
Valve and liquid storage fuel tank realize, for the sampling and constituent analysis to type chamber electric machining working solution after the row of returning, realize work
Make the recycling of liquid.
The detector gas circuit unit includes sequentially connected injection port, CO2Detector, chromatograph box and zirconium oxide detection
Device；The input terminal of the injection port is also connected with the output end of gas circuit control element, the input terminal of the gas circuit control element with
Carrier gas is connected.
The Zirconia detector is connected by signal attenuation module with computer digital animation unit.
It is heating furnace device outside ceramic tube, in heating furnace in the tubular zirconium-oxide insertion ceramic tube of the Zirconia detector
Pt100 temperature sensor is housed in device.
The CO2Detector includes infrared gas sensor and infrared light supply kit；The infrared gas sensor
Optical filter there are two upper, one of optical filter only allow CO2The wavelength that molecule can absorb is that 4.26 μm of infrared light passes through,
For detecting CO2Concentration；Another optical filter constitutes 4.00 μm of optical filter channels, for detecting in gas chamber in addition to CO2In addition
The concentration situation of change of other mixed gas.
The embedded control unit carries out bidirectional information with computer digital animation unit by the way of bus communication
Interaction, is connected using analog-to-digital conversion and digital interface mode with detector gas circuit unit, is driven using digital interface and power
Moving cell is connected with gaseous mixture sample preparation unit.
The embedded control unit is by temperature closed loop system to gaseous mixture sample preparation unit and detector gas circuit list
The temperature of member is controlled.
The embedded control unit receives the information of amount of liquid and amount of gas evolved in degasser, and is passed through according to relevant information
The switch of corresponding valve and the amount of gas evolved of aperture state guarantee constant volume working solution are controlled after crossing calculation processing, it is ensured that electrical fire
Spend the accurate of processing work liquid constituent analysis.
The computer digital animation unit is real using relevant chromatographic work station software and working solution constituent analysis software
Now to the analysis and judge of type chamber electric spark machining working solution ingredient and processing gap state and processing effect.
Beneficial effect
Due to the adoption of the above technical solution, compared with prior art, the present invention having the following advantages that and actively imitating
Fruit: the present invention may be implemented to judge electric spark on this basis to the analysis of mixed gas composition in electric spark machining working solution
The assessment and anticipation for processing gap and machining state, ensure that the stability of different operating condition lower impressions edm processes and mention
High processing efficiency and processing effect.
Detailed description of the invention
Fig. 1 is monitoring system general structure schematic diagram of the invention；
Fig. 2 is embedded control unit structural schematic diagram of the invention；
Fig. 3 is Zirconia detector structural schematic diagram of the invention；
Fig. 4 is CO of the present invention2Detector structural schematic diagram.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiments of the present invention are related to a kind of type chamber electric spark machining working solution component monitoring system, including mixing gas sample
Product preparation unit, detector gas circuit unit, embedded control unit and computer digital animation unit；The gaseous mixture sample system
Standby unit includes sequentially connected working solution sampling interface, degasser and gaseous mixture sample feeding device, the degasser
It is connected respectively with embedded control unit with gaseous mixture sample feeding device；The gaseous mixture sample feeding device also with the inspection
Device gas circuit unit is surveyed to be connected；The detector gas circuit unit respectively with the embedded control unit and computer digital animation list
Member is connected；It is connected between the embedded control unit and computer digital animation unit by fieldbus.
Wherein, the embedded control unit is carried out by the way of bus communication with computer digital animation unit two-way
Information exchange is connected, using digital interface and function with detector gas circuit unit using analog-to-digital conversion and digital interface mode
Rate driving unit is connected with gaseous mixture sample preparation unit.Computer digital animation unit is by PCI board card and universal serial bus and oxygen
Change zirconium detector and embedded control unit carries out information exchange.Using relevant chromatographic work station software and working solution ingredient point
Analyse analysis and judge of the software realization to type chamber electric spark machining working solution ingredient and processing gap state and processing effect.
The present invention is for based on type chamber electrical discharge machining chats oil type and kerosene working solution, in conjunction with chromatographic technique,
The regular sample introduction of headspace sampling method is used by type chamber edm process, with chromatographic technique quantitative analysis combination mass-spectrometric technique
The method of qualitative analysis, it is established that the pass of component content and processing stability and processing efficiency and processing effect in different operating liquid
Coefficient evidence.Analysis and modeling is carried out to data using mathematical statistics and the method for probability theory, is put for day rear profile chamber electrical discharge machining
Electricity condition detection device, processing gap state and processing quality analysis and the high speed synthesis type electrical discharge machining work of high-efficiency environment friendly
Liquid provides basis.
A kind of type chamber electric spark machining working solution component monitoring system as shown in Figure 1, including by working solution sampling and the row of returning
The gaseous mixture sample preparation unit that circulation loop is constituted, by sample gas after deaerating and carrier gas sample introduction is analyzed circuit and detector telecommunications
Number acquisition and monitoring analyze needed for air circuit constitute detector gas circuit unit, embedded control unit and equipped with research and application it is soft
The computer digital animation unit of part.Wherein, the working solution sampling interface in gaseous mixture sample preparation unit uses two-way operation
The sampling interface agency of liquid, including ablation particle filter, electric three passes valve and liquid storage fuel tank, for working type chamber electric machining
The sampling of liquid and the row of returning after constituent analysis, realize the recycling of working solution.The detector gas circuit unit include according to
Injection port, the CO of secondary connection2Detector, chromatograph box and Zirconia detector；The input terminal of the injection port is also connected with gas
The input terminal of the output end of road control element, the gas circuit control element is connected with carrier gas.
Embedded control unit as shown in Figure 2, in main realization system between gas circuit and working solution circuit and processor
The two-way intercommunication of various status informations provides basis for the accurate of gas component analysis in electric spark machining working solution.
The processor of the embedded control unit can be using ARM9 series STM32F103ZET6 as MCU, control association
It adjusts each module to operate, and acquisition data is handled and stored and with the communication of host computer etc..
As shown in Fig. 2, the embedded control unit is directed to CO2Detect signal, Pt100 temperature acquisition and operational hydraulic cylinder liquid
Pass through A/D converting transmitted information between amount and amount of gas evolved detection and MCU.AD conversion uses 14,8 channel precision component, conversion
Rate 16kHz.MCU is connect with Measurement &control computer by 232 interfaces, will be in embedded control unit using Modbus bus protocol
Electric spark machining working solution monitor system information and the state transfer real-time display into the HMI of computer.
The embedded control unit is directed to Zirconia detector in system, chromatograph box and constant volume head space operational hydraulic cylinder
Temperature control is realized by MCU by temperature closed loop system and relevant control algorithm, guarantees the control precision of operating temperature.Constant volume top
Amount of liquid, amount of gas evolved information are converted into counting by being sent into AD after sensor and conversion circuit in the degasser of empty operational hydraulic cylinder
Word amount is sent and MCU；MCU controls the switch of corresponding valve according to relevant information after calculation processing and aperture state guarantees perseverance
Determine the amount of gas evolved of volume working solution, it is ensured that electric spark machining working solution constituent analysis it is accurate.
As detecting the detection of zirconium oxide corresponding to the high concentration range of every kind of component of gaseous mixture in working fluid in system
The voltage signal peak value of device output has exceeded the range of pci signal capture card, therefore exports peak value converting unit using detector
Output voltage signal between gas component high concentration region is decayed (i.e. by Zirconia detector and computer data
Manage setting signal attenuation module between unit), peak value converting unit is controlled by embedded control unit, and AD conversion therein is to inspection
The output voltage peak value for surveying device is acquired, according to attenuation coefficient needed for the range restraint of crest voltage.
As shown in figure 3, be heating furnace device outside ceramic tube in the tubular zirconium-oxide insertion ceramic tube of Zirconia detector,
Pt100 temperature sensor is housed in heating furnace.The sensing and execution of temperature control system are made up of resistance heating wire and Pt100
Mechanism uses thermostatic control algorithm in MCU, allows heating in-furnace temperature steadily in the long term at 700 DEG C, guarantees that zirconium oxide output is electronic
Gesture and gas component measuring concentration of components are accurate.
As shown in figure 4, CO2Infrared detector includes infrared gas sensor and infrared light supply kit.Infrared-gas
There are two optical filters on sensor, and one of channel only allows CO2The infrared light that the wavelength that molecule can absorb is 4.26 μm
Pass through, so the light intensity for reaching this channel reflects CO2Concentration；Then by the light intensity in another 4.00 μm of optical filter channel
It reflects in gas chamber in addition to CO2The concentration situation of change of other mixed gas in addition.
The CO2Infrared detector applies the period to infrared light supply as 1S, and the DC pulse signal that duty ratio is 40% will
Mixed gas is sent into gas chamber from air inlet.Infrared detector is by CO2Concentration is converted into voltage signal, will by signal front end circuit
With CO2AD conversion is sent into digital signal after concentration dependent electric signal amplification, filtering.After carrying out digital filtering in MCU, adopt
With fieldbus by CO2Concentration amount is sent into monitoring computer, obtains CO using electric spark machining working solution constituent analysis software2Gas
Bulk concentration.
Claims (7)
1. a kind of type chamber electric spark machining working solution component monitoring system, which is characterized in that including gaseous mixture sample preparation unit,
Detector gas circuit unit, embedded control unit and computer digital animation unit；The gaseous mixture sample preparation unit includes
Sequentially connected working solution sampling interface, degasser and gaseous mixture sample feeding device, the degasser and mixing gas sample
Product sampling device is connected with embedded control unit respectively；The gaseous mixture sample feeding device also with the detector gas circuit list
Member is connected；The detector gas circuit unit is connected with the embedded control unit and computer digital animation unit respectively；Institute
It states and is connected between embedded control unit and computer digital animation unit by fieldbus；The detector gas circuit unit packet
Include sequentially connected injection port, CO2Detector, chromatograph box and Zirconia detector；The input terminal of the injection port is also connected with
There is the output end of gas circuit control element, the input terminal of the gas circuit control element is connected with carrier gas；The Zirconia detector
Tubular zirconium-oxide is inserted into ceramic tube, is heating furnace device outside ceramic tube, Pt100 temperature sensing is embedded in heating furnace device
Device；The embedded control unit is by temperature closed loop system to the temperature of gaseous mixture sample preparation unit and detector gas circuit unit
Degree is controlled, and makes the heating in-furnace temperature steady in a long-term using thermostatic control algorithm.
2. type chamber electric spark machining working solution component monitoring system according to claim 1, which is characterized in that the work
Liquid sampling interface is the sampling interface agency of two-way operation liquid, real by ablation particle filter, electric three passes valve and liquid storage fuel tank
It is existing, for the sampling and constituent analysis to type chamber electric machining working solution after the row of returning, realize the recycling of working solution.
3. type chamber electric spark machining working solution component monitoring system according to claim 1, which is characterized in that the oxidation
Zirconium detector is connected by signal attenuation module with computer digital animation unit.
4. type chamber electric spark machining working solution component monitoring system according to claim 1, which is characterized in that the CO2Inspection
Surveying device includes infrared gas sensor and infrared light supply kit；Optical filter there are two on the infrared gas sensor,
In an optical filter only allow CO2The wavelength that molecule can absorb is that 4.26 μm of infrared light passes through, for detecting CO2Concentration；
Another optical filter constitutes 4.00 μm of optical filter channels, for detecting in gas chamber in addition to CO2Other mixed gas is dense in addition
Spend situation of change.
5. type chamber electric spark machining working solution component monitoring system according to claim 1, which is characterized in that the insertion
Formula control unit carries out two-way information interaction with computer digital animation unit by the way of bus communication, using analog-to-digital conversion
And digital interface mode is connected with detector gas circuit unit, using digital interface and power drive unit and gaseous mixture sample
Preparation unit is connected.
6. type chamber electric spark machining working solution component monitoring system according to claim 1, which is characterized in that the insertion
Formula control unit receives the information of amount of liquid and amount of gas evolved in degasser, and is controlled after calculation processing according to relevant information
The switch and aperture state of corresponding valve guarantee the amount of gas evolved of constant volume working solution, it is ensured that electric spark machining working solution ingredient
That analyzes is accurate.
7. type chamber electric spark machining working solution component monitoring system according to claim 1, which is characterized in that the calculating
Machine data processing unit is using relevant chromatographic work station software and working solution constituent analysis software realization to type chamber electrical spark working
Work working solution ingredient and the analysis and judge for processing gap state and processing effect.
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| CN201710123598.7A CN106903382B (en) | 2017-03-03 | 2017-03-03 | A kind of type chamber electric spark machining working solution component monitoring system |
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| CN201710123598.7A CN106903382B (en) | 2017-03-03 | 2017-03-03 | A kind of type chamber electric spark machining working solution component monitoring system |
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| CN106903382B true CN106903382B (en) | 2019-03-08 |
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| DE102005031177A1 (en) * | 2005-07-04 | 2007-01-11 | Siemens Ag | Vehicle passenger compartment gas mixture constituent measurement procedure uses electrically filtered infrared radiation passed twice through sample holder using mirror on window heat sink |
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