CN108637219A - A kind of independent liquid level pressurizing control system and method for multidigit parallel connection compression casting device - Google Patents
A kind of independent liquid level pressurizing control system and method for multidigit parallel connection compression casting device Download PDFInfo
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- CN108637219A CN108637219A CN201810866505.4A CN201810866505A CN108637219A CN 108637219 A CN108637219 A CN 108637219A CN 201810866505 A CN201810866505 A CN 201810866505A CN 108637219 A CN108637219 A CN 108637219A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
Abstract
The invention discloses a kind of independent liquid level pressurizing control systems and method for multidigit parallel connection compression casting device, this system includes the platform for placing casting mold, multiple implementation of port are provided on platform, platform is arranged with multiple melt holding furnaces, each implementation of port is respectively connected to a holding furnace by stalk, each melt holding furnace respectively carries out pressurization by an independent control pressurer system and fills type.This system makes melt carry out in a manner of approximate laminar flow filling type in cavity, pointedly improves local solidification feeding capacity, reduces or eliminates casting dispersibility shrinkage defect, realizes that the pinhole rate of large aluminum alloy casting and gas porosity reach I grade.
Description
Technical field：
The present invention relates to a kind of multidigit parallel connection compression casting device more particularly to the holding furnace liquid of multidigit parallel connection compression casting device
Face pressurizing control system and method.
Background technology：
In fields such as aerospace, weapons, ship, automobile, electronics, large-scaled complex castings, especially large complicated aluminum alloy frame
Frame, plate shape, the demand of nacelle casting and application are just more and more extensive.Such casting has overall size big（Maximum 2500mm is left
It is right）, become wall thickness（5mm~100mm）, long flow, the design features such as thermal center dispersion, cause to be also easy to produce in casting forming process many
Problem：First, casting section thickness differential pressure is big, liter liquid is unstable, liquid level is asynchronous is also easy to produce turbulent flow, volume gas；Second is that long flow, melt table
Face tension is big, and large area cold shut, misrun easily occurs in casting；Third, there are multiple dispersion thermal centers, casting technique feeding energy for casting
Power is insufficient, causes pinhole rate, gas porosity exceeded；Fourth, the mushy freezing alloy solid-liquid section temperature difference is big, hot cracking tendency is serious；Fifth,
For Al-Mg alloy-steel castings in air lower charging type, the oxidation of Mg elements, scaling loss are serious.The above problem is frequently exposed to the development of casting
In production process, application of the large aluminum alloy casting in weaponry is constrained.Currently, domestic cast in large aluminum alloy
Correlative study is carried out in terms of technique and equipment, some precision casting technologies, such as vacuum boosting casting, low pressure casting, differential pressure casting
It makes etc. and to have obtained certain application in fields such as Aeronautics and Astronautics, weapons, but casting yield is low.
A kind of multi-pipeline low pressure, counter-pressure casting technique and its equipment are disclosed in Chinese patent CN104874767B, and
Pouring platform is specifically disclosed, the mold being arranged on pouring platform, at least one pouring furnace being arranged below pouring platform is arranged and exists
Heating device in pouring furnace, and the gas-tight gland that is arranged between pouring furnace and pouring platform, gas-tight gland are equipped with air inlet
Mouthful, pouring platform is equipped at least two sprue gates, and mold is equipped with and the matched inlet in sprue gate, each sprue gate difference
The stalk at least one pouring furnace is extended down into equipped with one.The patent rises liquid low pressure, counter-pressure casting simultaneously by multitube
Processes and apparatus so that there is better scheme to shorten liquid alloy by the design of running channel in the design process of process program
Flow distance, the loss for reducing heat effectively solve the problems, such as to owe casting under the precondition for not improving pouring temperature.
Above-mentioned patent is only referred to multitube while rising liquid, but substantially, only by multitube simultaneously rise liquid be cannot
Realize the Stable Filling of casting mold especially for complicated, large-scale, wall thickness change is big casting for, even multitube is same
When rise liquid and also can't resolve its internal internal soundness problem occurred because type reason is filled, such as cold shut, misrun, turbulent flow are scarce
It falls into.Even if entering type to melt still due to the complexity of casting by controlling melt synchronous progress filling liquid in stalk
Among chamber, it still will appear and fill the big phenomenon of type liquid fluctuating, and then generate the above problem.
In addition, during Liquid Level Pressure, easily there is metal bath surface nonsynchronous problem in casting mold, it is most likely that occur more
At this moment the phenomenon that platform holding furnace pours in down a chimney each other can threaten to the quality of casting.Currently, domestic be directed to antigravity casting liquid
The process control of face pressurization is studied, including multistage pid parameter control, parameter fuzzyization control, PID output blurrings
Control, but these control algolithms are difficult to appropriate big volume counter-gravity casting equipment.
Invention content：
The purpose of the present invention is to provide a kind of the only of multidigit parallel connection compression casting device of casting that is large-scale, complicated, becoming wall thickness
Vertical liquid level pressurizing control system and method, can improve the internal soundness of casting.
To achieve the goals above, the invention is realized in this way：It is a kind of to be used for the only of multidigit parallel connection compression casting device
Vertical liquid level pressurizing control system, it is characterised in that：Include the platform for placing casting mold, multiple implementation of port be provided on platform,
Platform is arranged with multiple melt holding furnaces, each implementation of port is respectively connected to a holding furnace by stalk, each
Melt holding furnace respectively carries out pressurization by an independent control pressurer system and fills type.
Each independent control pressurer system includes the pressure control module of holding furnace connection corresponding thereto, institute
Pressure control module is stated also to connect with compressed air source and exhaust passage.
Electropneumatic shuttle valve is provided between the pressure control module and the holding furnace.
Pressure detecting branch is additionally provided between the holding furnace and the pressure control module, in the pressure detecting branch
Road is connected with pressure transmitter.
The pressure control module is also associated with precise pressure-reducing valve.
Neural network fuzzy control module is set in the pressure control module.
The compressed air source be one and by a manual ball valve and an electropneumatic shuttle valve respectively with each pressure
Control module connects.
A kind of independent Liquid Level Pressure control method for multidigit parallel connection compression casting device includes the following steps：1）Together
Walk Pre-filled step：The manual ball valve and electropneumatic shuttle valve between compressed air source and pressure control module are opened, compression is empty
Gas enters among each pressure control module, opens precise pressure-reducing valve, opens the electropneumatic shuttle valve of first holding furnace,
Proportioning valve pressurizes according to 0.1-0.2KPa/s compression rates, and the metal bath surface height of holding furnace stalk is risen to mark position,
Then the precise pressure-reducing valve and electropneumatic shuttle valve for opening remaining holding furnace successively, liquid is risen by pressure control module by holding furnace
The metal bath surface of pipe rises to position identical with the metal bath surface of the stalk of first holding furnace；2）The independently pressurized step of liquid level
Suddenly：The electropneumatic shuttle valve for opening each holding furnace simultaneously, starts all pressure control modules, synchronizes and fill by the multi-region of design
Type and zoned pressure feeding technology curve carry out Liquid Level Pressure, and in boost process, pressure control module is anti-according to pressure transmission device
The pressure value of feedback executes neural network fuzzy control and calculates, and accurately correcting pressure by digital combination valve controls error, works as pressure
After reaching process curve designated value, all valves are closed, the independently pressurized process of liquid level terminates；3）Release step：Open holding furnace
Compressed air is discharged air bleeding valve by discharge duct, after the pressure of holding furnace is less than 3KPa, closes air bleeding valve.
Advantageous effect：
1. 4 holding furnace segmentations are independent part by 4 sets of pressure control modules that the present invention designs, 4 holding furnaces of realization
Independent or arbitrary combination synchronizes Liquid Level Pressure control, can meet the primary whole high-quality of 100kg ~ 2600kg different weight casting
Forming demand utilizes the independently pressurized control of the multi-region of 4 stalks so that melt is carried out in cavity in a manner of approximate laminar flow
Type is filled, local solidification feeding capacity is pointedly improved, reduces or eliminates casting dispersibility shrinkage defect, realizes large aluminum alloy
The pinhole rate and gas porosity of casting reach I grade.The design feature that casting can be directed to especially in process of setting carries out independent feeding
Pressurization more fully plays the technical advantage of the independent pressurization in parallel of multidigit.
2. the PID fuzzy control methods for the neural network that the present invention uses, the pid parameter of comparative example valve are repaiied at any time
Just, it with influence of the disturbing factors to control structure such as appropriate multidigit parallel connection compression casting equipment leakage, thermal expansion, volumes, solves
Counter-gravity casting equipment hysteresis strong problem realizes that Liquid Level Pressure pressure controling precision reaches ± 0.3KPa, fills type liquid surface wave
It is dynamic to be less than 10mm.
3. the metal bath surface height of 4 holding furnace stalks is risen to same tag position by the present invention by pressure control module
It sets, liquid level difference is less than 5mm, and then progress multi-region, which synchronizes, fills type and classification compression solidification, solves multidigit parallel connection pressurization casting
The problem of 4 holding furnaces of asynchronous appearance pour in down a chimney between each other in casting mold in liquid making face.
Description of the drawings：
Fig. 1 is multidigit parallel connection compression casting device front view；
Fig. 2 is the vertical view of Fig. 1；
Fig. 3 is the A-A sectional views of Fig. 2；
Fig. 4 is the cover body structure chart of multidigit parallel connection compression casting device；
Fig. 5 is the holding furnace structure chart of multidigit parallel connection compression casting device；
Fig. 6 is the stalk structure drawing of device of multidigit parallel connection compression casting device；
Fig. 7 is the furnace structure figure of multidigit parallel connection compression casting device；
Fig. 8 is the gas in and out mechanism figure of multidigit parallel connection compression casting device；
Fig. 9 is the independent liquid level pressurizing control system figure of multidigit parallel connection compression casting device；
Figure 10 is process curve figure；
Figure 11-15 fills type design sketch for casting mold.
Label declaration：1 platform；2 holding furnaces；201 furnace bodies；202 graphite crucibles；203 bells；204 leakage export mouths；3
Rack；4 cover bodies；401 journal stirrups；402 locking teeth B；5 locking flanges；501 locking teeth A；6 retaining rings；601U type grooves；7 cylinder pistons
Mechanism；8 ball bearing mechanisms；9 cotter mechanisms；10 furnace body walking mechanisms；1001 sliding rails；11 furnace body elevating mechanisms；12 air inlet-outlet devices；
13 stalk devices；1301 stalk epimeres；1302 stalk hypomeres；The upper stalks of 1301a；1301b insulating layers；Outside 1301c
Set；1301d pressing plates；1301e latch；1301f grooves；1301g resistance wires；1301h muffs；1301i positioning plates；1301j
Binding post；1302a stalk mouths；1201 air inlet/outlets；1202 into outlet pipe；1204 synchronous sealing devices；1204a is oriented to
Set；1204b guide rods；1204c guide holders；1204d fixed blocks；1204e disc spring sub-assemblies；14 resistance bands；15 furnace body wiring
Column；16 furnace body temperature measuring equipments；17 melt temperature measuring equipments；18 magnetic force homogenizers.
Specific implementation mode：
Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the invention is not limited in this
A little embodiments, any improvement or replacement on the present embodiment essence spirit still fall within the required guarantor of the claims in the present invention
The range of shield.
Embodiment 1：As shown in figs 1-9, a kind of multidigit parallel connection for large aluminum alloy casting is present embodiments provided to add
Casting device is pressed, is suitable for manufacturing the large-scaled complex castings in the fields such as aerospace, weapons, ship, automobile, electronics, especially
The casting such as large complicated aluminum alloy frame, plate shape, nacelle solve turbulent, cold existing for existing these large-scaled complex castings of manufacture
Every, misrun, the problems such as pinhole rate, gas porosity are exceeded, and oxide inclusion is serious, the yield rate of casting is improved.
Specifically, the casting device of the present embodiment includes platform 1, the platform top surface is working face, the platform bottom
Portion is mounted with holding furnace 2, and the holding furnace is that two or more and each holding furnace pass through mutually independent liter respectively
The implementation of port connection corresponding with working face of liquid pipe device, and the holding furnace is lower room.Wherein, the platform is provided in a machine
On frame 3, the rack includes the column being arranged in platform lower, and the platform is supported by the column, in the present embodiment
In, the platform and the column are netted welding structural element, and are locked by bolted connection, described flat
Platform top is additionally provided with cover body 4, and the cover body forms the work chamber of installation sand mold with working face, this is upper chamber.
For upper chamber, it is additionally provided with cover body on the working face, once after sand mold is placed on workbench, it is accurate
Before standby casting, just the cover body is located on the sand mold, forms a closed work chamber, until casting finishes it
Afterwards, the cover body is being removed, casting is being taken out.
Since the casting device of the present embodiment is to be suitable for heavy castings, cover body volume is naturally larger than the body of sand mold
Product, in the present embodiment, rotary type central enclosure that there are one the cover body tools, such as cylindrical, rectangular, polygon etc.,
The central enclosure bottom is openning shape, and the top of the central enclosure has a head-shield being tightly connected with it, the head-shield
In semicircle shape protruding upward, moves and install for the ease of cover body, cover body both sides are provided with journal stirrup 401.
And in order to enable cover body can stablize be mounted on platform on, pass through locking device between the cover body and platform
It is locked, the locking device includes the locking flange 5 being arranged on platform, and the locking flange is to be arranged in the platform
On the revolution shape consistent with the bottom outer shape of the central enclosure of cover body, and the locking flange is provided with locking outwardly
Tooth A501, the locking teeth A be evenly arranged with along locking flange outer it is multiple, and to ensure two neighboring locking teeth A it
Between spacing be not less than locking teeth A itself width；In addition, the locking device further includes being arranged under the central enclosure of cover body
The locking teeth B402 corresponding with the locking teeth A of portion outer, the locking teeth A and the locking teeth B shapes and quantity are equal
Unanimously, it is convenient for locking teeth A and locking teeth B overlapped；The locking device further includes outside the locking teeth A and locking teeth B
It is provided with retaining ring 6, the retaining ring is the revolving body consistent with locking flange shape, but diameter is slightly larger than locking flange,
The retaining ring is provided with the U-shape lock slot 601 towards the locking teeth A and locking teeth B, the distribution mode of the U-shaped locked groove with
Quantity is consistent with locking teeth A or locking teeth B, and the width of U-shaped locked groove is not more than two neighboring locking teeth A or two neighboring locks
Spacing between tight tooth B, the internal height of the U-shaped locked groove are not less than the sum of locking teeth A and locking teeth B, the U-shape lock slot energy
The locking teeth A and locking teeth B are enough wrapped up to carry out maintenance locking to cover body, in addition, the outer wall in the retaining ring connects
There are cylinder piston mechanism 7, cylinder body one end of the cylinder piston mechanism to be fixed on platform, the piston of the cylinder piston mechanism
One end fix connect with retaining ring, the rotation of the retaining ring is driven by cylinder piston mechanism.
In actual use, before cover body is installed, ensure retaining ring on U-shaped locked groove be located at two locking teeth B it
Between, after then installing sand mold, cover body is hung on platform by hoisting mechanism so that the cover body is placed on platform
Locking flange on, and make cover body on locking teeth A with lock flange on locking teeth B be aligned, then lived by cylinder body
It fills in mechanism and drives the retaining ring rotation so that the U-shaped locked groove turns to the position of locking teeth A and locking teeth B and wraps
Then the locking teeth A and locking teeth B keeps the cylinder piston position not move.
In addition, another embodiment as the present embodiment, in order to ensure rotation reliability of the retaining ring on platform with
Smoothness is provided with ball bearing mechanism 8 between the retaining ring bottom and the platform.
As another embodiment of the present embodiment, between the inside roof and locking teeth A of the U-shaped locked groove and U
Cotter mechanism circumferentially is respectively arranged on the inside of type retaining ring between bottom wall and locking teeth B.The cotter mechanism can be two
Part, the bottom surface in the top surface of locking teeth A and locking teeth B is arranged in a portion, and another part is arranged on the inside of U-shaped locked groove
Roof and bottom wall, matched with another part, two parts of the voussoir have mutually matched inclined-plane, that is to say, that from cutting
Face sees that two parts of the voussoir are in the triangle of cooperation respectively, and forms a rectangle after coordinating.And the inclined-plane is
Along the circumferentially disposed of retaining ring, and must assure that retaining ring locking when rotation direction when two triangles inclined-plane into
Row cooperation, and after once rotateing in place, it due to the limitation on inclined-plane, can not be further continued for rotating, ensure that the reliability of installation.
About lower room, the holding furnace 2 can have more, such as Liang Tai, three, four, five, six, seven,
Eight even with more, but the holding furnace in the present embodiment be four, each holding furnace is all at least corresponding with one on platform
A implementation of port is all provided with stalk device between each holding furnace and corresponding implementation of port.
The heat preservation furnace bottom is provided with furnace body walking mechanism 10, the furnace body walking mechanism and the holding furnace it
Between be additionally provided with furnace body elevating mechanism 11；The furnace body walking mechanism include be laid on the ground and pass through framework platform lower part
Sliding rail 1001, and the traveling wheel in furnace body bottom surface is set, wherein the sliding rail is two sets disposed in parallel, in any sliding rail
There are two holding furnaces for upper placement, and the holding furnace is moved on the slide rail by traveling wheel, and two on same sliding rail holding furnace
Individually control, can be in opposite directions or mutually from movement, and the sliding rail can be alternatively double rail type for monorail；In the present embodiment
In, the sliding rail is double rail type, and two holding furnaces are both provided on each sliding rail, and two holding furnaces set up separately when not working
At sliding rail both ends, when work, moved towards to mesa base by walking mechanism,；The furnace body elevating mechanism is spiral lifting
Mechanism.
In inoperative, holding furnace is moved to by furnace body walking mechanism other than rack, and at work, holding furnace passes through stove
Body walking mechanism moves to mesa base, and opposite with corresponding implementation of port, then makes holding furnace by furnace body elevating mechanism
It is connect by stalk device between platform, guarantee upper chamber is to be connected to filling with lower room.Wherein, it is guarantee reliability of operation
With accuracy, the furnace body walking mechanism and furnace body elevating mechanism in the present embodiment are all made of hydraulic control.
The holding furnace includes furnace body 201 and the graphite crucible 202 in the furnace body, in the stove sheet
It is provided with bell 203 on body, the furnace body bottom is provided with leakage export mouth 204, the leakage export mouth is arranged in institute
It states and is arranged on furnace body lowest part outer wall, and the leakage export mouth between bottom in the furnace body towards being provided with inclined-plane.
Be provided with the air inlet-outlet device 12 communicated with graphite crucible on the bell, and the bell and the platform it
Between be additionally provided with the stalk device 13, attemperator is additionally provided on the furnace body, and in the furnace body bottom
It is provided with agitating device.
Wherein, the stalk device 13 includes being arranged in platform base and the stalk epimere 1301 that is connected to implementation of port
And the stalk hypomere 1302 risen at liquid mouth being arranged on the bell of holding furnace.
The stalk epimere includes that upper stalk 1301a in inside, the insulating layer that is wrapped in outside upper stalk is arranged
1301b, the housing 1301c being wrapped in outside the insulating layer, the housing top surface by screw lock on pressing plate 1301d, institute
Pressing plate is stated to be fixedly connected with the platform, the housing bottom surface is connected with latch 1301e, the latch to upper stalk,
Insulating layer and housing carry out maintenance, and on the pressing plate and latch on be provided with trepanning, the upper stalk passes through described
Trepanning on pressing plate is communicated with implementation of port, and the upper stalk is with the trepanning phase copper on the latch and in the trepanning following table
Face is provided with the groove 1301f expanded outward；It is provided with resistance wire 1301g and muff 1301h in the insulating layer, and is protecting
Positioning 1301i is both provided between temperature set top and bottom and pressing plate and latch.And the resistance wire by electric wire or other lead
Electric line is connected with heating device, this heating device is existing, and resistance wire can be allowed to be powered and the device of heat occurs, such as
Say that the resistance wire connects binding post 1301j by electric wire, and the electric wire is arranged in porcelain tube set, and the binding post peripheral hardware
It is equipped with fixed plate, insulation sleeve is additionally provided on binding post.Also, the resistance wire in the present embodiment is also associated with thermometric thermoelectricity
It is even, it is capable of the temperature of real-time monitoring resistor silk.And the stalk hypomere 1302 can be inserted directly into the stalk being arranged on bell
Mouth 1302a is simultaneously extend into graphite crucible, and the top of the stalk is provided with outwardly projecting boss, and boss size is more than institute
Stalk mouth is stated, can be directly anchored on bell, can be also fixed by the device of screw.In addition, under the stalk
The top outer of section is provided with sealing ring, and the sealing ring is fixed on stalk mouth top surface, stalk hypomere and stalk epimere
When mobile connection, among the groove that the sealing ring can be placed on the pressing plate and to being tightly against stalk upper-lower section
Between, the sealing of stalk upper-lower section.
In inoperative, the stalk epimere and the stalk hypomere are separated from each other, and at work, it is described
Stalk lower end follows the holding furnace to be moved to the lower section of stalk epimere, and is enough realized on stalk by furnace body lifting
The docking of hypomere compresses the sealing ring in docking and then realizes the sealing of stalk upper-lower section, and then ensures that solution is filling
It will not be leaked during type.And after casting finishes, it can directly be removed under stalk in the case where not hanging away casting mold
End, prevents stalk from phenomenon of freezing to death occur, and then prevents casting from cannot get effective feeding, the phenomenon that stalk can not be extracted,
So that the feeding effect of casting is greatly enhanced, the efficiency of Foundry Production and the quality of casting ensure that.
The air inlet-outlet device includes the air inlet/outlet 1201 communicated with graphite crucible and corresponding with air inlet/outlet
Into outlet pipe 1202, described into being provided with synchronous sealing device 1204, the synchronization between outlet pipe and air inlet/outlet
Sealing device include with the guide sleeve 1204a being fixedly connected into outlet pipe, further include a hollow guide rod 1204b, institute
It states guide rod one end to be inserted into the guide sleeve, the other end is provided with the boss outwardly protruded, in the middle part of the guide rod
It is provided with elastic mechanism, the elastic mechanism includes guide holder 1204c of the empty set in the middle part of guide rod, and the guide holder passes through solid
Determine block 1204d to be fixed on the rack, disc spring sub-assembly is provided between the guide holder and the boss of the guide rod
1204e, disc spring sub-assembly one end are connect with guide holder, and the other end is connect with boss, is additionally provided in the middle part of the boss
The protrusion outwardly protruded can place sealing ring, in the disengaging so that boss outer forms groove in the groove
It may be provided with recessed portion corresponding with protrusion at gas port so that protrusion and recessed portion cooperate, and make sealing ring
Between protrusion and recessed portion, and it is compacted.
In inoperative, the air inlet/outlet and it is separated from each other into outlet pipe, and at work, it is described into outlet
Mouthful move to immediately below the guide rod of synchronous sealing device with the movement of holding furnace, realized in holding furnace uphill process with it is synchronous
The docking of the guide rod of sealing device, the sealing ring being arranged at air inlet/outlet in docking is realized with the bottom surface of guide rod to be contacted
And compress, and then ensure compressed gas will not be leaked in cavity filling process, and also ensure melt will not leak, so far into
The docking of air-out mechanism finishes.And after casting finishes, it can directly be removed by furnace body elevating mechanism and furnace body walking mechanism
Holding furnace without being installed or removed to gas in and out mechanism, and can guarantee air-tightness, it is even more important that pass through again
This distribution form will be arranged in rack into escape pipe and synchronous sealing device, not moved with the movement of holding furnace, body
Cleaning, the safety and reliability of layout are showed.
The attemperator of the holding furnace includes the resistance band 14 being fixed on furnace body madial wall, the resistance band
It is connect with the furnace body binding post 15 being arranged on furnace body lateral wall by electric wire, by connecing electricity to electricity to furnace body binding post
Stopband is heated, and furnace body temperature measuring equipment 16 is provided in the furnace body, and melt survey is provided in the graphite crucible
Warm device 17；It can be that furnace body heats by heating device, ensure the temperature of melt, and must assure that the temperature in furnace body
More than the temperature in graphite crucible, the temperature in the temperature and graphite crucible in furnace body can be detected in real time by temperature-detecting device
Degree.
The leakage export mouth includes the leakage export mouth being arranged in furnace body lower part, and the leakage export mouth is to described
It is that inclined-plane is arranged in the middle part of furnace body inner bottom wall, this is the conventional arrangement of most of holding furnaces, and details are not described herein.
The furnace body bottom is plane, and the furnace body bottom is provided with magnetic force homogenizer 18, the furnace body
Bottom is plane, the furnace body bottom is provided with magnetic stirring apparatus, the magnetic stirring apparatus is existing mechanism, is passed through
It generates rotating excitation field and reaches the homogenized purpose of magnetic force.Magnetic stirring apparatus in the present embodiment is the product bought in the market, purchase
From Hu'nan Kemeida Electric Co., Ltd., concrete model is determined according to holding furnace volume.
About the multidigit parallel connection compression casting device of the present embodiment, the present embodiment additionally provides a kind of independent Liquid Level Pressure control
System processed, i.e. 1#-4# holding furnaces respectively carry out pressurization by an independent control pressurer system and fill type, i.e. 1# holding furnaces and 1#
Pressure control module connects, and electric control starting shuttle valve SV02 is provided between 1# holding furnaces and 1# pressure control modules, is protected in 1#
Warm stove is additionally provided with chamber pressure power transmitter under 1# with 1# pressure control modules, and the 1# pressure control modules are connected with 1# rows
Gas circuit and 1# precise pressure-reducing valves；2# holding furnaces are connect with 2# pressure control modules, 2# holding furnaces and 2# pressure control modules it
Between be provided with electric control starting shuttle valve SV03, the chamber pressure power transmitter in the case where 2# holding furnaces and 2# pressure control modules are additionally provided with 2#,
And the 2# pressure control modules are connected with 2# exhaust lines and 2# precise pressure-reducing valves；3# holding furnaces connect with 3# pressure control modules
It connects, electric control starting shuttle valve SV04 is provided between 3# holding furnaces and 3# pressure control modules, in 3# holding furnaces and 3# pressure controls
Molding block is additionally provided with chamber pressure power transmitter under 3#, and the 3# pressure control modules are connected with 3# exhaust lines and 3# precisions subtract
Pressure valve；4# holding furnaces are connect with 4# pressure control modules, and automatically controlled open is provided between 4# holding furnaces and 4# pressure control modules
Dynamic shuttle valve SV05, the chamber pressure power transmitter in the case where 4# holding furnaces and 4# pressure control modules are additionally provided with 4#, and the 4# pressure
Control module is connected with 4# exhaust lines and 4# precise pressure-reducing valves.Neural network fuzzy control mould is set in the pressure control module
Block.
And 1# ~ 4# pressure control modules are also connect with compressed air source, 1# ~ 4# compressed air sources are one and pass through
One manual ball valve SQ01 and an electropneumatic shuttle valve SV01 are connect with 1# ~ 4# pressure control modules respectively.
The present embodiment additionally provides a kind of independent Liquid Level Pressure control method for multidigit parallel connection compression casting device, packet
Include following steps：1）Synchronous Pre-filled step：Open manual ball valve between compressed air source and pressure control module and automatically controlled
Pneumatic shuttle valve, compressed air enter among each pressure control module, open precise pressure-reducing valve, open first holding furnace
Electropneumatic shuttle valve, proportioning valve pressurizes according to 0.1-0.2KPa/s compression rates, and the metal bath surface of holding furnace stalk is high
Degree rises to mark position, then opens the precise pressure-reducing valve and electropneumatic shuttle valve of remaining holding furnace successively, is controlled by pressure
The metal bath surface of holding furnace stalk is risen to position identical with the metal bath surface of the stalk of first holding furnace by module；2）
The independently pressurized step of liquid level：The electropneumatic shuttle valve of each holding furnace is opened simultaneously, starts all pressure control modules, by setting
The multi-region of meter, which synchronizes, fills type and zoned pressure feeding technology curve progress Liquid Level Pressure, in boost process, pressure control module root
According to the pressure value that pressure transmission device is fed back, executes neural network fuzzy control and calculate, pressure control is accurately corrected by proportioning valve
Error closes all valves after pressure reaches process curve designated value, and the independently pressurized process of liquid level terminates；3）Release step：
Holding furnace air bleeding valve is opened, compressed air is discharged by discharge duct, after the pressure of holding furnace is less than 3KPa, closes exhaust
Valve.
For device provided in this embodiment, control system and method, the implementation in production application in detail below is given
Example.For multidigit parallel connection compression casting equipment, carries out dry run experiment according to the process curve of Fig. 2 settings, examine the equipment same
It walks Pre-filled and independently pressurized pressure curve in the process executes precision.Equipment feature：4 800kg holding furnaces, work chamber inner cavity ruler
Very little Φ 4040mm × 2800mm, stalk caliber Φ 160mm, gas circuit caliber Φ 50mm, maximum working pressure≤0.60MPa.
（1）By horizontal mobile mechanism, holding furnace is moved to platform lower, furnace body jacking system is then used, makes guarantor
Warm stove is risen by the rate of 20mm/s, is completed the sealing of holding furnace and middle partition board sealing shroud, is covered work chamber, is locked by 4
Hydraulic oil cylinder driving retaining ring is locked, and the air compressor machine of air source is opened, and ensures bleed pressure in 0.8MPa or so.
（2）SQ01 manual ball valves and SV01 electropneumatic shuttle valves are first opened, compressed air enters 4 sets of pressure control modules
In, 001 precise pressure-reducing valve is opened, then open No. 1 holding furnace SV02 electropneumatic shuttle valve, starts proportioning valve according to 0.15KPa/s
Compression rate, by pressure rise to 15KPa.Then 002 ~ 004 precise pressure-reducing valve, SV03 ~ SV05 electropneumatics are opened successively
2 ~ No. 4 heat preservation furnace pressures are increased to 14.5KPa, 15.5KPa, 16.5KPa by shuttle valve by pressure control module.
（3）SV02 ~ SV05 electropneumatic shuttle valves are first opened simultaneously, start 4 sets of pressure control modules, by the synchronization of design
It fills type and zoned pressure feeding technology curve and carries out Liquid Level Pressure, in boost process, pressure control module is according to pressure transmitter
The pressure value of feedback executes neural network fuzzy control and calculates, and pressure control error is accurately corrected by proportioning valve, when pressure arrives
Up to after process curve designated value, all valves are closed, the independently pressurized process of liquid level terminates.
（4）Holding furnace air bleeding valve is opened, compressed air is discharged by discharge duct, when the pressure of holding furnace is less than 3KPa
Afterwards, it is driven by locking cylinder and opens retaining ring, open work chamber.Whole process completed using industrial personal computer synchronous Pre-filled and
The real-time record of independently pressurized pressure process data and preservation.
Implementation result：Synchronous Pre-filled process procedure pressure curve executes precision ± 0.25KPa, independently pressurized pressure process
Curve executes precision ± 0.18KPa, pneumatic system response speed 30ms.
Claims (8)
1. a kind of independent liquid level pressurizing control system for multidigit parallel connection compression casting device, it is characterised in that：Including being used for
The platform of casting mold is placed, is provided with multiple implementation of port on platform, platform is arranged with multiple melt holding furnaces, each implementation of port
It is respectively connected to by stalk with a holding furnace, each melt holding furnace respectively passes through an independent control pressurer system
It carries out pressurization and fills type.
2. the system as claimed in claim 1, it is characterised in that：Each independent control pressurer system includes corresponding thereto
The pressure control module for the holding furnace connection answered, the pressure control module are also connect with compressed air source and exhaust passage.
3. system as claimed in claim 2, it is characterised in that：It is provided between the pressure control module and the holding furnace
Electropneumatic shuttle valve.
4. system as claimed in claim 2 or claim 3, it is characterised in that：Between the holding furnace and the pressure control module also
It is provided with pressure detecting branch, pressure transmitter is connected on pressure detecting branch road.
5. the system as described in any of the above-described claim, it is characterised in that：The pressure control module is also associated with precision
Pressure reducing valve.
6. the system as described in any of the above-described claim, it is characterised in that：Neural network is set in the pressure control module
Fuzzy control model.
7. the system as described in any of the above-described claim, it is characterised in that：The compressed air source is one and passes through one
Manual ball valve and an electropneumatic shuttle valve are connect with each pressure control module respectively.
8. a kind of independent Liquid Level Pressure control method for multidigit parallel connection compression casting device, which is characterized in that including following
Step：
1）Synchronous Pre-filled step：Open the manual ball valve and electropneumatic shuttle between compressed air source and pressure control module
Valve, compressed air enter among each pressure control module, open precise pressure-reducing valve, open the automatically controlled of first holding furnace
Pneumatic shuttle valve, proportioning valve pressurize according to 0.1-0.2KPa/s compression rates, and the metal bath surface height of holding furnace stalk is risen to
Then mark position opens the precise pressure-reducing valve and electropneumatic shuttle valve of remaining holding furnace successively, will by pressure control module
The metal bath surface of holding furnace stalk rises to position identical with the metal bath surface of the stalk of first holding furnace；
2）The independently pressurized step of liquid level：The electropneumatic shuttle valve for opening each holding furnace simultaneously starts all pressure control moulds
Block is synchronized by the multi-region of design and fills type and zoned pressure feeding technology curve progress Liquid Level Pressure, in boost process, pressure control
The pressure value that module is fed back according to pressure transmission device executes neural network fuzzy control and calculates, pressure is accurately corrected by proportioning valve
Power control error closes all valves after pressure reaches process curve designated value, and the independently pressurized process of liquid level terminates；
3）Release step：Holding furnace air bleeding valve is opened, compressed air is discharged by discharge duct, when the pressure of holding furnace is less than
After 3KPa, air bleeding valve is closed.
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