CN107584097A - A kind of air injection machine liquid level suspension control method - Google Patents
A kind of air injection machine liquid level suspension control method Download PDFInfo
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- CN107584097A CN107584097A CN201710767232.3A CN201710767232A CN107584097A CN 107584097 A CN107584097 A CN 107584097A CN 201710767232 A CN201710767232 A CN 201710767232A CN 107584097 A CN107584097 A CN 107584097A
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Abstract
A kind of air injection machine liquid level suspension control method, it is characterised in that：Comprise the following steps：1）Parameter setting；2）Rise the liquid stage；3）Fill the type stage；4）Pressurization stages：5）Packing stage；6）Suspension stages；7）Increase casting material or stop casting.The present invention, holding furnace increases temperature sensor on the basis of original sprue gate sensor in low pressure casting, both are used in combination, and there is specific control flow to ensure in PLC, the determining program in production process is changed, sprue gate molten metal sputters caused by preventing when pressure sensor failure, blow-on, improves production security, the input of weight, can ignore the influence of body of heater shape when new computational methods reduce casting material addition.
Description
Technical field
The invention belongs to automobile and motorcycle wheel hub Casting Equipment, and using body of heater pressurising, with resultant pressure, temperature signal, control aluminium closes
The method that metal bath surface suspends in golden wheel hub foundry production, applied to air injection machine.
Background technology
Present automobile industry wheel hub manufacture typically uses low pressure casting, is made up of holding furnace, mold machine table, control system.
Aluminium liquid is added in holding furnace by transporting pot, sealing thermal insulation stove.The aluminium liquid in holding furnace is passed through a liter liquid by control pressure during work
Pipe is pressed onto in board mould, and qualified product can be obtained by specific pressurization, cooling technique.But existing liquid level suspends
Technology is mainly controlled according to pressure monitor, the gas leakage for body of heater, and the pressure compensation adjustment of body of heater change in shape can not be real
Monitored when real；It is also possible to because pressure sensor failure, there is aluminium liquid sputtering, temperature in use of the present invention when opening body of heater
Sensor coordinates the state position for judging suspension liquid level, is ensured together for production increase, also simplifies again with stylish computational methods
The input of secondary charging, is easy to execute-in-place.
The content of the invention
The problem of existing for liquid level suspended pattern in above-mentioned wheel hub low pressure casting, it is an object of the invention to provide one kind
Air injection machine liquid level suspension control method, it is to increase temperature transducer at the sprue gate of original holding furnace, changes production process
In determining program, prevent due to pressure sensor failure, caused sprue gate molten metal sputtering during blow-on, carried for safety in production
For ensureing, there is provided new computational methods also simplify the input to feed again.
The technical scheme is that be accomplished by the following way：A kind of air injection machine liquid level suspension control method,
It is characterized in that：Comprise the following steps：
1）Parameter setting：It is determined that the maximum metal liquid mass M of air injection machine, density p, single-piece quality m, body of heater half is poured into first
In footpath R, stalk internal diameter r1, stalk external diameter r, the liquid level difference H needed apart from sprue gate 30-50mm, casting cycle in body of heater
Residual metallic liquid minimum constructive height H1, calculates original liquid level H0：H0=M/(π*R2）, or according to measurement H3, by design height
H4 is calculated, and H0=H4-H3 carries out parameter setting, the quality of molten metal M that body of heater maximum can be poured into；
2）Rise the liquid stage：Levitation pressure P is determined according to liquid level differencejs=ρ*g*H；According to setting rate of pressure increase, controlled by PLC
Valve group lifting furnace pressure is Pjs, at this moment liquid level difference is H, and cut-out supply waits 2S, and liter liquid stage first time terminates, existed manually
Touch-screen parameter setting interface, it is determined that actual temperature T nowmin, pressure P0, △ P=P-P0：P observed pressures；This is for the first time
Charging setting, changes temperature every time, needs to set again during pressure sensor, height H2=H*r1 that liquid level reduces in body of heater2
/(R2-r2)；Liquid level H6=H0-H1-H2, maximum pressurization △ Pmax≤ρ*g*H6；The workpiece number N of productionmax≤π*（R2-
r2）*H6*ρ/m；If adding casting material again, judged whether to reach suspension liquid level according to temperature, the lower deviation of preset temperature is 2；
Temperature T during operation<Tmin- 2, it is system alarm, pressure release, to be checked, lift golden suspension liquid level difference and reach H；
3）Fill the type stage：With the rate of pressure increase of setting, control supercharging valve group I to control air inlet by PLC, progressively reach setting pressure
Power P=n* m*g/ π/(R2-r2）During+P1, stop pressurising, P1-first type that fills terminates pressure, the workpiece that n-current production is completed
Quantity, temperature upper limit T is set when filling type for the first timemax, the upper deviation is preset as 2, temperature T during normal operation<Tmin- 2, system report
It is police, pressure release, to be checked；
4）Pressurization stages：With the rate of pressure increase of setting, supercharging valve group control air inlet is controlled by PLC, progressively reaches setting pressure
Power P=n* m*g/ π/(R2-r2）+P2；P2-first boosted junction beam pressure power；Temperature T during operation<Tmin- 2, system alarm, pressure release,
It is to be checked；
5）Packing stage：Air inlet is controlled by PLC controls solenoid valve block I, maintains setting pressure P=n* m*g/ π/(R2-r2）+ P2,
Certain time is maintained, temperature T during operation<Tmin- 2, it is system alarm, pressure release, to be checked；
6）Suspension stages：After reaching the scheduled time, be vented by PLC control magnetic valves III with setting speed, reach setting pressure P=
n* m*g/π/(R2-r2）The height for dropping to setting, temperature T ﹤ T are returned in+P0, metal liquid suspensions facemax+ 2, temperature is normal or judges
Suspension liquid level takes workpiece away when returning to setting liquid level；
7）Increase casting material：Pressure discharge operations are first carried out, then by step 2）Perform and rise liquid, setting suspension is reached according to temperature value
Face；If preceding routine is normal, it is not necessary to adds casting material, this then skips step 2）, continue casting next time；If stopping casting, enter
Enter pressure discharge operations.
Described air inlet, exhaust process are completed by PLC：Solenoid valve block I, magnetic valve II are normally closed solenoid valve, two-bit triplet
The gas circuit of magnetic valve IV connects normally opened end, sets the maximum output pressure of pressure-reducing valve；
1）Rise the liquid stage：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to
Pressure change is set, PLC adjusts the switch combination of solenoid valve block I, flow meter I adjusted as needed, to reach setting flow；
2）Fill the type stage：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to
Pressure change is set, PLC adjusts the switch combination of solenoid valve block I, to reach setting flow.
3）Pressurization stages：Solenoid valve block I, II it is electric, magnetic valve III powers off, two-bit triplet magnetic valve IV it is electric, according to setting
Constant-pressure changes, and PLC adjusts the switch combination of solenoid valve block I, to reach setting flow；
4）Packing stage：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to
The dwell pressure of setting and the error of permission, the switch combination of solenoid valve block I is adjusted by PLC pid algorithm, reaches pressurize
Purpose；
5）Suspension stages：Solenoid valve block I, magnetic valve II power off, and magnetic valve III must be electric, and two-bit triplet magnetic valve IV must be electric, according to
The rate of pressure change of setting, flow meter II is adjusted, magnetic valve III powers off after reaching the levitation pressure of setting；Pass through PLC PID
The switch combination of algorithm adjustment solenoid valve block I and magnetic valve II, the break-make of magnetic valve III, realize that metal bath surface suspends, if continuously
Casting, then perform step 2）-5）Circulation；
6）The pressure release stage：When the casting of this bag terminates or needs to increase casting material, solenoid valve block I, magnetic valve II power off, magnetic valve III
Power-off, two-bit triplet magnetic valve IV power off, and carry out pressure release.
The present invention, holding furnace increases temperature sensor on the basis of original sprue gate sensor in low pressure casting, both
It is used in combination, and has specific control flow to ensure in PLC, change the determining program in production process, prevents due to pressure
Caused sprue gate molten metal sputtering, increases production security, there is provided new computational methods are also simple when force snesor failure, blow-on
Change the input to feed again.
Brief description of the drawings
Fig. 1 is single stove low-voltage temperature-keeping furnace structure schematic diagram.
Fig. 2 is low-voltage temperature-keeping stove levels pressure change curve.
Fig. 3 is the supply control schematic diagram that suspends.
In figure：1- solenoid valve blocks I, 2- pressure-reducing valves, 3- magnetic valves II, 4- magnetic valves III, 5- two-bit triplets magnetic valve VI,
F1- flow meter Is, F2- flow meter IIs.
Embodiment
Known by Fig. 1, Fig. 2, a kind of air injection machine liquid level suspension control method, comprised the following steps：
1st, parameter setting：It is determined that the maximum metal liquid mass M of air injection machine, density p, single-piece quality m, body of heater half is poured into first
In footpath R, stalk internal diameter r1, stalk external diameter r, the liquid level difference H needed apart from sprue gate 30-50mm, casting process in body of heater
Residual metallic liquid minimum constructive height H1, calculates original liquid level H0：H0=M/(π*R2）, or according to measurement H3, by design height
H4 is calculated, and H0=H4-H3 carries out parameter setting；Specific body of heater size and liquid level facilities are shown in Fig. 1；Body of heater maximum can be poured into
Quality of molten metal M, can make basis of liquid level H6 to calculate maximum later, the convenient part calculated after addition casting material
Largest production quantity.
2nd, the liquid stage is risen：Levitation pressure P is determined according to liquid level differencejs=ρ*g*H；According to setting rate of pressure increase, by PLC
Control valve group lifting furnace pressure is Pjs, at this moment liquid level difference is H, and cut-out supply waits 2S, and liter liquid stage first time terminates, hand
Move in touch-screen parameter setting interface, it is determined that actual temperature T nowmin, pressure P0, △ P=P-P0：P observed pressures；This is
Once charging setting, changes temperature every time, needs to set again during pressure sensor, height H2=H* that liquid level reduces in body of heater
r12 /(R2-r2)；Described liquid level H6=H0-H1-H2, maximum pressurization △ Pmax≤ρ*g*H6；The workpiece number N of productionmax
≤π*（R2-r2）*H6*ρ/m；If again plus casting material, judge whether to reach suspension liquid level according to temperature, under preset temperature
Deviation is 2（Deviation must adjust according to the actual type of furnace and temperature sensor installation site）；Temperature during operation
T<Tmin- 2, it is system alarm, pressure release, to be checked, lift golden suspension liquid level difference and reach H,
3rd, the type stage is filled：With the rate of pressure increase of setting, control supercharging valve group I 1 to control air inlet by PLC, progressively reach setting
Pressure P=n* m*g/ π/(R2-r2）During+P1, stop pressurising, P1-first type that fills terminates pressure, the work that n-current production is completed
Number of packages amount, temperature upper limit T is set when filling type for the first timemax, the upper deviation is preset as 2（Deviation must be according to the actual type of furnace and TEMP
Device installation site adjusts）, temperature during normal operation
T<Tmin- 2, it is system alarm, pressure release, to be checked；
4th, pressurization stages：With the rate of pressure increase of setting, control supercharging valve group I 1 to control air inlet by PLC, progressively reach setting
Pressure P=n* m*g/ π/(R2-r2）+P2；P2-first boosted junction beam pressure power；Temperature T during operation<Tmin- 2, system alarm, let out
Press, be to be checked；
5th, packing stage：Air inlet is controlled by PLC control solenoid valve blocks I 1, maintains setting pressure P=n* m*g/ π/(R2-r2）+ P2,
Certain time is maintained, temperature T during operation<Tmin- 2, it is system alarm, pressure release, to be checked；
6th, suspension stages：After reaching the scheduled time, be vented by PLC control magnetic valves III 4 with setting speed, reach setting pressure P=
n* m*g/π/(R2-r2）The height for dropping to setting, temperature T ﹤ T are returned in+P0, metal liquid suspensions facemax+ 2, temperature is normal or judges
Suspension liquid level takes workpiece away when returning to setting liquid level；
The pressure situation of changing with time is shown in Fig. 2 in specific casting cycle.Now according to detect this bag production workpiece number and
Pressure change △ P, as production workpiece number N=Nmax- 2 or △ P >=△ Pmax-2*m*g/π/(R2-r2）When, operation interface is carried
Show " casting material must be added ", if PLC counts to get N=NmaxOr △ P >=△ PmaxWhen, it is automatically stopped casting, it is necessary to add casting
Material can just carry out next casting；If desired casting material is increased in body of heater, after the completion of addition, it is not necessary to charging quality is set,
" charging is completed again " button is clicked on, clearing is counted to the workpiece of previous casting.
7th, increase casting material, first carry out pressure discharge operations, then by step 2）Perform and rise liquid, reaching setting according to temperature value suspends
Liquid level；If preceding routine is normal, it is not necessary to adds casting material, this then skips step 2）, continue casting next time；If stopping casting,
Into pressure discharge operations.
Known by Fig. 3, be the supply control schematic diagram that suspends.Described air inlet, exhaust process are completed by PLC：Solenoid valve block I 1,
Magnetic valve II 3 is normally closed solenoid valve, and the gas circuit of two-bit triplet magnetic valve IV 5 connects normally opened end（Can releasing pressure automatically during power-off）, set
Filter the maximum output pressure of pressure-reducing valve 2；
（1）Rise the liquid stage：Solenoid valve block I 1, magnetic valve II 3 must be electric, and magnetic valve III 4 powers off, and two-bit triplet magnetic valve IV 5 must be electric,
According to setting pressure change, PLC adjusts the switch combination of solenoid valve block I 1, adjusts flowmeter-flow meter I F1 as needed, with
Reach setting flow；
（2）Fill the type stage：Solenoid valve block I 1, magnetic valve II 3 must be electric, and magnetic valve III 4 powers off, and two-bit triplet magnetic valve IV 5 must be electric,
According to setting pressure change, PLC adjusts the switch combination of solenoid valve block I 1, to reach setting flow；
（3）Pressurization stages：Solenoid valve block I 1, magnetic valve II 3 must be electric, and magnetic valve III 4 powers off, and two-bit triplet magnetic valve IV 5 must be electric,
According to setting pressure change, PLC adjusts the switch combination of solenoid valve block I 1, to reach setting flow；
（4）Packing stage：Solenoid valve block I 1, magnetic valve II 3 must be electric, and magnetic valve III 4 powers off, and two-bit triplet magnetic valve IV 5 must be electric,
According to the dwell pressure of setting and the error of permission, the switch combination of solenoid valve block I 1 is adjusted by PLC pid algorithm, reached
To pressurize purpose；
（5）Suspension stages：Solenoid valve block I 1, magnetic valve II 3 power off, and magnetic valve III 4 must be electric, and magnetic valve IV 5 must be electric, according to setting
Rate of pressure change, adjust flow meter II F2, reach magnetic valve III 4 after the levitation pressure of setting and power off；Pass through PLC PID
The switch combination of algorithm adjustment solenoid valve block I 1 and magnetic valve II 3, the break-make of magnetic valve III 4, realize that metal bath surface suspends, if even
Continuous casting, then perform step（2）-（5）Circulation；
（6）The pressure release stage：When the casting of this bag terminates or needs to increase casting material, solenoid valve block I 1, magnetic valve II 3 power off, electromagnetism
Valve III 4 powers off, and two-bit triplet magnetic valve IV 5 powers off, and carries out pressure release.
Claims (2)
- A kind of 1. air injection machine liquid level suspension control method, it is characterised in that：Comprise the following steps：1）Parameter setting：It is determined that the maximum metal liquid mass M of air injection machine, density p, single-piece quality m, body of heater half is poured into first In footpath R, stalk internal diameter r1, stalk external diameter r, the liquid level difference H needed apart from sprue gate 30-50mm, casting process in body of heater Residual metallic liquid minimum constructive height H1, calculates original liquid level H0：H0=M/(π*R2）, or according to measurement H3, by design height H4 is calculated, and H0=H4-H3 carries out parameter setting；The quality of molten metal M that body of heater maximum can be poured into；2）Rise the liquid stage：Levitation pressure P is determined according to liquid level differencejs=ρ*g*H；According to setting rate of pressure increase, controlled by PLC It is P that valve group I, which lifts furnace pressure,js, at this moment liquid level difference is H, and cut-out supply waits 2S, and liter liquid stage first time terminates, manually In touch-screen parameter setting interface, it is determined that actual temperature T nowmin, pressure P0, △ P=P-P0：P observed pressures；This is first Secondary charging setting, changes temperature every time, needs to set again during pressure sensor, height H2=H* that liquid level reduces in body of heater r12 /(R2-r2)；Described liquid level H6=H0-H1-H2, maximum pressurization △ Pmax≤ρ*g*H6；The workpiece number N of productionmax ≤π*（R2-r2）*H6*ρ/m；If again plus casting material, judge whether to reach suspension liquid level according to temperature, under preset temperature Deviation is 2；Temperature T during operation<Tmin- 2, it is system alarm, pressure release, to be checked, lift golden suspension liquid level difference and reach H；3）Fill the type stage：With the rate of pressure increase of setting, control supercharging valve group I to control air inlet by PLC, progressively reach setting pressure Power P=n* m*g/ π/(R2-r2）During+P1, stop pressurising, P1-first type that fills terminates pressure, the workpiece that n-current production is completed Quantity, temperature upper limit T is set when filling type for the first timemax, the upper deviation is preset as 2（Deviation must be according to the actual type of furnace and temperature sensor Installation site adjusts）, temperature during normal operationT<Tmin- 2, it is system alarm, pressure release, to be checked；4）Pressurization stages：With the rate of pressure increase of setting, supercharging valve group control air inlet is controlled by PLC, progressively reaches setting pressure Power P=n* m*g/ π/(R2-r2）+P2；P2-first boosted junction beam pressure power；Temperature T during operation<Tmin- 2, system alarm, pressure release, It is to be checked；5）Packing stage：Air inlet is controlled by PLC controls solenoid valve block I, maintains setting pressure P=n* m*g/ π/(R2-r2）+ P2, dimension Hold certain time, temperature T during operation<Tmin- 2, it is system alarm, pressure release, to be checked；6）Suspension stages：After reaching the scheduled time, be vented by PLC control magnetic valves III with setting speed, reach setting pressure P= n* m*g/π/(R2-r2）The height for dropping to setting, temperature T ﹤ T are returned in+P0, metal liquid suspensions facemax+ 2, temperature is normal or judges Suspension liquid level takes workpiece away when returning to setting liquid level；7）Increase casting material, first carry out pressure discharge operations, then by step 2）Perform and rise liquid, setting suspension is reached according to temperature value Face；If preceding routine is normal, it is not necessary to adds casting material, this then skips step 2）, continue casting next time；If stopping casting, enter Enter pressure discharge operations.
- A kind of 2. air injection machine liquid level suspension control method according to claim 1, it is characterised in that：Described step 2）-5）Middle air inlet, exhaust process are completed by PLC：Solenoid valve block I, magnetic valve II are normally closed solenoid valve, two-bit triplet magnetic valve IV Gas circuit connects normally opened end, releasing pressure automatically during power-off, sets the maximum output pressure of filtering pressure reducing valve：（1）Rise the liquid stage：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to Pressure change is set, PLC adjusts the switch combination of solenoid valve block I, flow meter I adjusted as needed, to reach setting flow；（2）Fill the type stage：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to Pressure change is set, PLC adjusts the switch combination of solenoid valve block I, to reach setting flow；（3）Pressurization stages：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to Pressure change is set, PLC adjusts the switch combination of solenoid valve block I, to reach setting flow；（4）Packing stage：Solenoid valve block I, magnetic valve II must be electric, and magnetic valve III powers off, and two-bit triplet magnetic valve IV must be electric, according to The dwell pressure of setting and the error of permission, the switch combination of solenoid valve block is adjusted by PLC pid algorithm, reaches pressurize Purpose；（5）Suspension stages：Solenoid valve block I, magnetic valve II power off, and magnetic valve III must be electric, and two-bit triplet magnetic valve IV must be electric, according to The rate of pressure change of setting, flow meter II is adjusted, magnetic valve III powers off after reaching the levitation pressure of setting；Pass through PLC PID The switch combination of algorithm adjustment solenoid valve block I and magnetic valve II, the break-make of magnetic valve III, realize that metal bath surface suspends, if continuously Casting, then perform step 2）-5）Circulation；（6）The pressure release stage：When the casting of this bag terminates or needs to increase casting material, solenoid valve block I, magnetic valve II power off, magnetic valve III power-off, two-bit triplet magnetic valve IV power off, and carry out pressure release.
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| CN109351944A (en) * | 2018-12-04 | 2019-02-19 | 江苏天鼎精密机械有限公司 | Low pressure casting pressurization parameter automatic creation system |
| CN112122597A (en) * | 2020-09-30 | 2020-12-25 | 含山盛荣机械配件厂 | Molten iron pouring device for sand casting |
| CN112255914A (en) * | 2020-09-18 | 2021-01-22 | 东风汽车集团有限公司 | Die-casting control method, device and equipment for cold chamber die-casting machine and storage medium |
| CN114321719A (en) * | 2022-01-04 | 2022-04-12 | 国家石油天然气管网集团有限公司 | Automatic distribution and transmission method and automatic distribution and transmission system for natural gas pipeline |
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| CN112122597A (en) * | 2020-09-30 | 2020-12-25 | 含山盛荣机械配件厂 | Molten iron pouring device for sand casting |
| CN114321719A (en) * | 2022-01-04 | 2022-04-12 | 国家石油天然气管网集团有限公司 | Automatic distribution and transmission method and automatic distribution and transmission system for natural gas pipeline |
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