CN109047722A - A kind of adjustable pressure casting push-pull type air-channel system and its method - Google Patents
A kind of adjustable pressure casting push-pull type air-channel system and its method Download PDFInfo
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- CN109047722A CN109047722A CN201811242068.5A CN201811242068A CN109047722A CN 109047722 A CN109047722 A CN 109047722A CN 201811242068 A CN201811242068 A CN 201811242068A CN 109047722 A CN109047722 A CN 109047722A
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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
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
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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
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention proposes a kind of adjustable pressure casting push-pull type air-channel system and method, and the system comprises upper pressure chambers, lower pressure chamber, and realizes the voltage-controlled system of the upper pressure chamber and the lower pressure chamber pressure control；The voltage-controlled system includes pumped vacuum systems, boosting rectifier control system and depressurized system；It carries out filling type under negative pressure, eliminates the back-pressure of gas in casting mold, mold filling pressure is small, not only ensure that the pressure crystallizing of casting, but also can avoid casting deformation or rupture.Upper and lower pressure chamber is separately connected two regulating valves using push-pull type gas circuit method by the present invention, and is connect respectively with pressure pump and vacuum pump.This system uses the method that can accurately control chamber pressure is forced above and below as 0Mpa and 0.08Mpa, and control fast response time in press process, it is high-efficient, the accuracy and speed of pressure control determines the quality of casting, this system may be implemented the accurate of large thin wall casting and fill type, improve the casting accuracy of large thin wall casting.
Description
Technical field
The invention belongs to the technical field of adjustable pressure casting more particularly to a kind of adjustable pressure casting push-pull type air-channel system and its
Method.
Background technique
Since thin-section casting filling is more difficult, generally require to increase casting section thickness, to guarantee the smooth filling of casting.If
It sets the adjustment Casting Solidification Temperature Field such as large-scale riser and strengthens feeding.Increase riser, increase wall thickness on the one hand waste alloy material
Material, on the other hand since thick-walled casting center portion cooling velocity is low, will lead to coarse grains, reduces cast properties.
In order to realize that the smooth of casting fills type, the method used in gravity casting process in early days is to improve pouring for molten metal
Note temperature preheats casting mold.Both modes can improve the mobility of molten metal, extend the flowing time of molten metal,
It can solve the problems, such as to fill type to a certain extent.But due to introducing surplus heat, casting cooling can be made slowly, setting temperature
Gradient and setting rate reduce, this will lead to the coarse grains in casting, deteriorate cast properties；In addition to this, it is certain more
In the case of extreme, since the angle of wetting between molten metal and casting mold is limited, when casting section thickness is reduced to a critical value, metal
The pressure of liquid itself is suitable with Laplce's power that molten metal capillary effect at thin-walled is formed, and using conventional methods merely can not
It gets a desired effect.In addition to this, gravitational casting cannot achieve the good control to mold filling pressure, no matter Design of Runner System
How reasonable obtain, and is all difficult to avoid splashing and turbulent flow, easily generates casting and owes the casting flaws such as casting, loose, oxide inclusion.
Based on the above issues, the upper exhaust air-channel system that traditional handicraft proposes, control system are only vented without tonifying Qi
Function, if therefore rise liquid and fill type stage pressure room pressure is excessive overshoot occurs, system can not be adjusted, be cast in this case
Casting accuracy it is lower, performance is poor.
Summary of the invention
Technical problems to be solved:
In order to avoid the shortcomings of the prior art, the present invention propose a kind of adjustable pressure casting push-pull type air-channel system and its
Method respectively connects two regulating valves using upper and lower pressure chamber, and is respectively connected with the structure of pressure pump and vacuum pump, in conjunction with push-pull type
Air-channel system enables upper and lower pressure chamber real-time ventilation and tonifying Qi.Realize adjustable pressure casting upper pressure chamber and lower pressure chamber pressure in the process
The accurate control of power, that realizes large thin wall casting accurately fills type.
The technical scheme is that a kind of adjustable pressure casting push-pull type air-channel system, it is characterised in that: including upper pressure
Room, lower pressure chamber, and realize the voltage-controlled system of the upper pressure chamber and the control of lower pressure chamber pressure；The adjustable pressure casting
Upper plenum is set in the upper pressure chamber, and the lower cavity of the adjustable pressure casting is set in the lower pressure room, is made described
Seal chamber is formed between upper plenum and upper pressure chamber, between lower cavity and lower pressure chamber；The riser of the adjustable pressure casting seals
Seal chamber across the upper plenum and upper pressure chamber is set to outside the upper pressure chamber；The upper pressure chamber and pushing
Power room is mutually indepedent, and inside is not connected to, external to pass through the voltage-controlled system connectivity；
The voltage-controlled system includes pumped vacuum systems, boosting rectifier control system and depressurized system；
The pumped vacuum systems is adjusted by vacuum pump, vacuum tank, vacuum filter, normally open solenoid valve and normally opened air bladder
Valve is sequentially connected composition, and is connect respectively with the upper pressure chamber and lower pressure chamber by the normally opened pneumatic diaphragm control valve；
For adjusting the upper pressure chamber and lower pressure chamber suction；
The boosting rectifier control system is by pressure pump, pressurized tank, pressure reducing valve, normally closed solenoid valve and normally-closed pneumatic diaphragm valve
Be sequentially connected composition, and by the normally closed solenoid valve and normally-closed pneumatic diaphragm valve respectively with the upper pressure chamber and described
Lower pressure chamber's connection；For to the upper pressure chamber and the pressurization of lower pressure chamber；
The depressurized system includes normally open solenoid valve and normally opened pneumatic diaphragm control valve, two normally opened air bladder tune
One end of section valve is connected with the upper pressure chamber and the lower pressure chamber respectively, and the other end is connected with normally open solenoid valve and connects big
Gas；For to the upper pressure chamber and the release of lower pressure chamber；
The upper pressure chamber is connected with the lower pressure outdoor by two normally open solenoid valves arranged side by side, and being used for will be described
It is connected to or is isolated between upper pressure chamber and the lower pressure chamber.
A kind of operating method of adjustable pressure casting push-pull type air-channel system, it is characterised in that adjustable pressure casting specific steps are as follows:
Step 1: upper pressure chamber and lower pressure chamber are installed in rear chamber and are vacuumized, vacuum degree need to reach-
0.095Mpa, for about 8min；
Step 2: opening manually-operated gate, pressurizeed by pressure pump to pressurized tank 2, until the pressure value in pressurized tank 2 reaches
0.6Mpa, and close manually-operated gate；Start to cast；
Step 3: normally open solenoid valve for leading to the upper pressure chamber and the lower pressure chamber repeatedly is closed, described in opening
The normally closed solenoid valve of boosting rectifier control system, by adjusting the normally-closed pneumatic diaphragm valve, normally opened connecting with the upper pressure chamber
Pneumatic diaphragm control valve is 0Mpa come the pressure value for controlling upper pressure chamber；By adjusting the normally closed gas connecting with the lower pressure chamber
Diaphragm valve and normally opened pneumatic diaphragm control valve are moved to control the pressure of lower pressure chamber 13 as 0.08Mpa, and is made on described
The pressure difference of pressure chamber and the lower pressure chamber is kept constant, and is continued 8-10min, is formed casting solidification；
Step 4: pressure maintaining terminates, and opens the normally open solenoid valve for the upper pressure chamber to be connected to the lower pressure chamber,
The normally closed solenoid valve connecting in the boosting rectifier control system with the upper pressure chamber and the lower pressure chamber is closed, the pumping is closed
The normally open solenoid valve being connect in vacuum system and the depressurized system with the upper pressure chamber and the lower pressure chamber so that described
Upper pressure chamber and the lower pressure chamber interior intercommunication；Shed the pressure of the upper pressure chamber and lower pressure chamber；
Step 5: opening the normally open solenoid valve connecting in the depressurized system with the upper pressure chamber and the lower pressure chamber
With normally opened pneumatic diaphragm control valve, and the normally open solenoid valve connected with atmosphere, discharge in the upper pressure chamber and lower pressure room
Compressed gas completes casting.
Invention effect
The technical effects of the invention are that: the present invention carries out filling type under negative pressure, eliminates the back-pressure of gas in casting mold, fills
Type pressure is small, not only ensure that the pressure crystallizing of casting, but also can avoid casting deformation or rupture.
The present invention is to be separately connected two regulating valves with upper and lower pressure chamber using push-pull type air-channel system, and respectively with pressure
Power pump is connected with vacuum pump.When the indoor pressure of upper pressure is less than required value, pressure chamber is connected with pressure pump in opening tune
Save valve, the regulating valve that pressure chamber is connected with vacuum pump in closing, to upper pressurisation of pressure chambers；However when upper pressure chamber's pressure value is higher than
When required value, the regulating valve that pressure chamber is connected with vacuum pump in opening simultaneously closes off the adjusting that pressure chamber is connected with pressure pump
Valve depressurizes upper pressure chamber, and until meeting the requirements, the pressure control principle of lower pressure chamber is identical as upper pressure chamber.This system energy
Enough chamber pressures that will force above and below accurately control as 0Mpa and 0.08Mpa, and control fast response time in press process, efficiency
Height, the accuracy and speed of pressure control determine that the quality of casting, this system may be implemented the accurate of large thin wall casting and fill type,
Improve the casting accuracy of large thin wall casting.
The present invention integrates adjustable pressure casting, low pressure casting and suction pouring, on the one hand saves equipment cost and workshop accounts for
On the other hand ground area can use optimal forging type for different casting, such as produce thin-section casting, can pay the utmost attention to
Adjustable pressure casting；If producing mean wall thickness casting, low pressure casting can be paid the utmost attention to.Meanwhile different add, can be studied based on this equipment
Influence of the process curve to cast properties is pressed, if suction pouring fills type+positive pressure solidification, in this way, adjustable pressure casting technology is just not only
It is that vacuum degassing+negative pressure fills type+positive pressure solidification technique, but integrates the synthesis mould casting process of a variety of casting processes,
More it is able to satisfy the needs of production.
Detailed description of the invention
Fig. 1 is the push-pull type air-channel system schematic diagram for adjustable pressure casting of the invention；
Fig. 2 is adjustable pressure casting process curve；
Fig. 3 is low-pressure casting process curve；
Fig. 4 is the upper and lower cavity of casting and the positional relationship of upper pressure chamber, lower pressure chamber.
Description of symbols: 1, hand valve；2, pressurized tank；3, the first normally closed solenoid valve；4, the first normally-closed pneumatic film is adjusted
Valve；5, the second normally closed solenoid valve；6, third normally closed solenoid valve；7, the second normally-closed pneumatic diaphragm valve；8, first is normally opened pneumatic
Diaphragm valve；9, the first normally open solenoid valve；10, the second normally open solenoid valve；11, upper pressure chamber；12, third normally open solenoid valve；
13, lower pressure chamber；14, the 4th normally open solenoid valve；15, the 5th normally open solenoid valve；16, the second normally opened pneumatic diaphragm control valve.
Specific embodiment
The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to be used to explain the present invention, and cannot understand
For limitation of the present invention.
A kind of adjustable pressure casting push-pull type air-channel system includes upper pressure chamber, lower pressure chamber, and realizes the upper pressure
The voltage-controlled system of room and the control of lower pressure chamber pressure；The upper plenum of the adjustable pressure casting is set in the upper pressure chamber, institute
The lower cavity for stating adjustable pressure casting is set in the lower pressure room, make between the upper plenum and upper pressure chamber, lower cavity and
Lower pressure chamber forms seal chamber；Seal chamber of the riser of the adjustable pressure casting across the upper plenum and upper pressure chamber,
It is set to outside the upper pressure chamber；The upper pressure chamber and lower pressure chamber are mutually indepedent, and inside is not connected to, external by described
Voltage-controlled system connectivity；
The voltage-controlled system includes pumped vacuum systems, boosting rectifier control system and depressurized system；
The pumped vacuum systems is adjusted by vacuum pump, vacuum tank, vacuum filter, normally open solenoid valve and normally opened air bladder
Valve is sequentially connected composition, and is connect respectively with the upper pressure chamber and lower pressure chamber by the normally opened pneumatic diaphragm control valve；
For adjusting the upper pressure chamber and lower pressure chamber suction；
The boosting rectifier control system is by pressure pump, pressurized tank, pressure reducing valve, normally closed solenoid valve and normally-closed pneumatic diaphragm valve
Be sequentially connected composition, and by the normally closed solenoid valve and normally-closed pneumatic diaphragm valve respectively with the upper pressure chamber and described
Lower pressure chamber's connection；For to the upper pressure chamber and the pressurization of lower pressure chamber；
The depressurized system includes normally open solenoid valve and normally opened pneumatic diaphragm control valve, two normally opened air bladder tune
One end of section valve is connected with the upper pressure chamber and the lower pressure chamber respectively, and the other end is connected with normally open solenoid valve and connects big
Gas；For to the upper pressure chamber and the release of lower pressure chamber；
The upper pressure chamber is connected with the lower pressure outdoor by two normally open solenoid valves arranged side by side, and being used for will be described
It is connected to or is isolated between upper pressure chamber and the lower pressure chamber.
The following are the adjustable pressure casting operating methods of push-pull type air-channel system:
Embodiment one:
Refering to fig. 1 and Fig. 2, the present embodiment provide a kind of application gas circuit structure progress large thin-wall complexity provided by the invention
The application example of part adjustable pressure casting.
Step 1: it is normally opened to open the first normally open solenoid valve 9, the 5th normally open solenoid valve 15, the 4th normally open solenoid valve 14, third
Solenoid valve 12 and the first normally opened pneumatic diaphragm control valve 8, the second normally opened pneumatic diaphragm control valve 16, to pressure chamber 11 on casting machine
It is vacuumized with lower pressure chamber 13, the pressure of the pressure chamber Shi Shang 11 and lower pressure chamber 13 reaches negative pressure -0.095Mpa, continues
8min。
Step 2: opening manually-operated gate 1, pressurizeed by pressure pump to pressurized tank 2, until the pressure value in pressurized tank 2 reaches
0.6Mpa, and close manually-operated gate 1；Then start to cast.
Step 3: closing third normally open solenoid valve 12, open third normally closed solenoid valve 6, the second normally closed solenoid valve 5, first often
Solenoid valve 3 is closed, controls upper pressure by adjusting the second normally-closed pneumatic diaphragm valve 7, the first normally opened pneumatic diaphragm control valve 8
The pressure value of room 11 be 0Mpa, by adjust the first normally-closed pneumatic diaphragm valve 4, the second normally opened pneumatic diaphragm control valve 16 come
The pressure for controlling lower pressure chamber 13 is 0.08Mpa, and pressure chamber 11 and the pressure difference of lower pressure chamber 13 are kept constant, and is held
Continuous 8-10min, forms casting solidification.
Step 4: pressure maintaining terminates, and opens third normally open solenoid valve 12, closes third normally closed solenoid valve 6, the second normally closed electromagnetism
Valve 5, the first normally open solenoid valve 9, the 5th normally open solenoid valve 15, the 4th normally open solenoid valve 14, so that upper pressure chamber 11 and lower pressure
13 intercommunication of room starts the pressure for shedding pressure chamber 11 and lower pressure chamber 13.
Step 5: it is normally opened to open the first normally open solenoid valve 9, the 5th normally open solenoid valve 15, the second normally open solenoid valve 10 and first
Pneumatic diaphragm control valve 8, the second normally opened pneumatic diaphragm control valve 16 discharge pressure chamber 11 and lower 13 internal pressure of pressure chamber on casting machine
Contracting gas completes casting.
Embodiment two:
Refering to fig. 1 and Fig. 3, this example provide a kind of application that low pressure casting is carried out using air-channel system provided by the invention
Example.
When low pressure casting, the seal closure of upper pressure chamber 11 is removed first, without vacuumizing, need to only control lower pressure chamber 13
Pressure completes entire low pressure casting process, and detailed process is as follows:
Step 1: opening manually-operated gate 1, given by pressure pump and pressurizeed to pressurized tank 2, until 2 pressure value of pressurized tank reaches
0.6Mpa, and close manually-operated gate 1；Then start to cast.
Step 2: opening the second normally closed solenoid valve 5, the 5th normally open solenoid valve 15, the first normally closed solenoid valve 3, the second normally opened electricity
Magnet valve 10 controls lower pressure chamber by adjusting the first normally-closed pneumatic diaphragm valve 4, the second normally opened pneumatic diaphragm control valve 16
13 pressure is 0.08Mpa, keeps 8-10min, casting solidification molding.
Step 3: pressure maintaining terminates, and opens the 5th normally open solenoid valve 15, the second normally open solenoid valve 10, the second normally opened air bladder
Regulating valve 16 closes the second normally closed solenoid valve 5, the first normally closed solenoid valve 3, normally closed first pneumatic diaphragm control valve 4, unloads and press
Gas completes casting.
Technological principle of the invention is as follows: when adjustable pressure casting, upper and lower pressure chamber vacuumized first, vacuum degree need to reach-
0.095Mpa, for about 8min；It is forced into 0.6Mpa to pressurized tank by pressure pump, adjusting pneumatic diaphragm control valve makes pressure chamber
Interior pressure is 0Mpa, makes lower pressure chamber pressure 0.08Mpa, if the indoor pressure of upper pressure is less than required value, in opening
The regulating valve that pressure chamber is connected with pressure pump, the regulating valve that pressure chamber is connected with vacuum pump in closing, to upper pressurisation of pressure chambers；When
When upper pressure chamber's pressure value is higher than required value, the regulating valve that pressure chamber is connected with vacuum pump in opening simultaneously closes off pressure chamber
The regulating valve being connected with pressure pump depressurizes upper pressure chamber, and until meeting the requirements, lower pressure chamber pressure control principle is identical, and protects
Hold pressure difference about 8-10min, casting solidification molding；Upper and lower pressure chamber's intercommunication valve is opened, the pressure of upper and lower pressure chamber is balanced,
It deflates, casting is completed.
When low pressure casting, the seal closure of upper pressure chamber is removed first, without vacuumizing, need to only control the pressure of lower pressure chamber
It keeps 0.08Mpa and continues 8-10min to complete to cast.
In addition, this device can be also used for process for suction casting.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (2)
1. a kind of adjustable pressure casting push-pull type air-channel system, it is characterised in that: including upper pressure chamber, lower pressure chamber, and realize
The voltage-controlled system of the upper pressure chamber and the control of lower pressure chamber pressure；The upper plenum of the adjustable pressure casting is set to the upper pressure
In power room, the lower cavity of the adjustable pressure casting is set in the lower pressure room, make between the upper plenum and upper pressure chamber,
Seal chamber is formed between lower cavity and lower pressure chamber；Upper plenum described in the riser hermetically passing of the adjustable pressure casting and upper pressure
Seal chamber between room is set to outside the upper pressure chamber；The upper pressure chamber and lower pressure chamber are mutually indepedent, and inside does not connect
It is logical, it is external to pass through the voltage-controlled system connectivity；
The voltage-controlled system includes pumped vacuum systems, boosting rectifier control system and depressurized system；
The pumped vacuum systems by vacuum pump, vacuum tank, vacuum filter, normally open solenoid valve and normally opened pneumatic diaphragm control valve according to
It is secondary to connect and compose, and connect respectively with the upper pressure chamber and lower pressure chamber by the normally opened pneumatic diaphragm control valve；For
Adjust the upper pressure chamber and lower pressure chamber suction；
The boosting rectifier control system by pressure pump, pressurized tank, pressure reducing valve, normally closed solenoid valve and normally-closed pneumatic diaphragm valve successively
Connect and compose, and by the normally closed solenoid valve and normally-closed pneumatic diaphragm valve respectively with the upper pressure chamber and the pushing
The connection of power room；For to the upper pressure chamber and the pressurization of lower pressure chamber；
The depressurized system includes normally open solenoid valve and normally opened pneumatic diaphragm control valve, two normally opened pneumatic diaphragm control valves
One end be connected respectively with the upper pressure chamber and the lower pressure chamber, the other end is connected with normally open solenoid valve and connects atmosphere；
For to the upper pressure chamber and the release of lower pressure chamber；
The upper pressure chamber is connected with the lower pressure outdoor by two normally open solenoid valves arranged side by side, is used for the upper pressure
It is connected to or is isolated between power room and the lower pressure chamber.
2. a kind of use the method for push-pull type air-channel system of adjustable pressure casting described in claim 1, it is characterised in that adjustable pressure casting
Specific steps are as follows:
Step 1: upper pressure chamber and lower pressure chamber being installed in rear chamber and vacuumized, vacuum degree need to reach -0.095Mpa, hold
Renewed treaty 8min；
Step 2: opening manually-operated gate, pressurizeed by pressure pump to pressurized tank 2, until the pressure value in pressurized tank 2 reaches
0.6Mpa, and close manually-operated gate；Start to cast；
Step 3: closing the normally open solenoid valve for leading to the upper pressure chamber and the lower pressure chamber repeatedly, open the boosting
The normally closed solenoid valve of control system, by adjust connect with the upper pressure chamber normally-closed pneumatic diaphragm valve, it is normally opened pneumatically
Diaphragm valve is 0Mpa come the pressure value for controlling upper pressure chamber；It is thin by adjusting the normally-closed pneumatic connecting with the lower pressure chamber
Diaphragm control valve and normally opened pneumatic diaphragm control valve are 0.08Mpa come the pressure for controlling lower pressure chamber 13, and make the upper pressure
The pressure difference of room and the lower pressure chamber is kept constant, and is continued 8-10min, is formed casting solidification；
Step 4: pressure maintaining terminates, and opens the normally open solenoid valve for the upper pressure chamber to be connected to the lower pressure chamber, closes
The normally closed solenoid valve connecting in the boosting rectifier control system with the upper pressure chamber and the lower pressure chamber vacuumizes described in closing
The normally open solenoid valve being connect in system and the depressurized system with the upper pressure chamber and the lower pressure chamber so that the upper pressure
Power room and the lower pressure chamber interior intercommunication；Shed the pressure of the upper pressure chamber and lower pressure chamber；
Step 5: open the normally open solenoid valve being connect in the depressurized system with the upper pressure chamber and the lower pressure chamber and often
Pneumatic diaphragm control valve, and the normally open solenoid valve connected with atmosphere are opened, the upper pressure chamber and lower pressure interior compression are discharged
Gas completes casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811242068.5A CN109047722A (en) | 2018-10-24 | 2018-10-24 | A kind of adjustable pressure casting push-pull type air-channel system and its method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811242068.5A CN109047722A (en) | 2018-10-24 | 2018-10-24 | A kind of adjustable pressure casting push-pull type air-channel system and its method |
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| CN109047722A true CN109047722A (en) | 2018-12-21 |
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| CN201811242068.5A Pending CN109047722A (en) | 2018-10-24 | 2018-10-24 | A kind of adjustable pressure casting push-pull type air-channel system and its method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111299546A (en) * | 2020-04-20 | 2020-06-19 | 江苏天宏智能装备有限公司 | Pressure regulation control system for high-pressure differential pressure casting |
| CN113732269A (en) * | 2021-10-08 | 2021-12-03 | 江苏天宏智能装备有限公司 | Pressure regulation control system and method for full-function antigravity casting |
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| CN111299546A (en) * | 2020-04-20 | 2020-06-19 | 江苏天宏智能装备有限公司 | Pressure regulation control system for high-pressure differential pressure casting |
| CN113732269A (en) * | 2021-10-08 | 2021-12-03 | 江苏天宏智能装备有限公司 | Pressure regulation control system and method for full-function antigravity casting |
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Application publication date: 20181221 |
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