CN111299546A - Pressure regulation control system for high-pressure differential pressure casting - Google Patents
Pressure regulation control system for high-pressure differential pressure casting Download PDFInfo
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- CN111299546A CN111299546A CN202010311749.3A CN202010311749A CN111299546A CN 111299546 A CN111299546 A CN 111299546A CN 202010311749 A CN202010311749 A CN 202010311749A CN 111299546 A CN111299546 A CN 111299546A
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- 238000005266 casting Methods 0.000 title claims abstract description 89
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 6
- 238000005429 filling process Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
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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
- B22D18/08—Controlling, supervising, e.g. for safety reasons
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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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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Abstract
The invention discloses a pressure regulation control system for high-pressure differential casting, which comprises high-pressure differential casting equipment consisting of an upper pressure tank, a lower pressure tank and a buffer tank, and also comprises a pressure regulation module, wherein the pressure regulation module comprises a central controller, a stop valve, a digital valve bank and a differential pressure sensor; the central controller is connected with the stop valve, the digital valve group and the differential pressure sensor to form a closed-loop control system, and the differential pressure sensor is connected with the upper pressure tank and the lower pressure tank. The invention solves the problem of high pressure resistance of high-precision pressure regulating components. The pressure difference sensor detects the pressure difference between the upper pressure tank and the lower pressure tank in real time and transmits the pressure difference to the central controller, and the central controller, the stop valve, the digital valve group and the pressure difference sensor form a closed-loop control system to adjust and control the pressure difference between the upper pressure tank and the lower pressure tank in real time so as to realize the adjustment and control of the pressure of the high-pressure differential pressure casting.
Description
Technical Field
The invention relates to the technical field of casting molding, in particular to a pressure regulation control system suitable for high-pressure counter-pressure casting.
Background
The traditional counter-pressure casting is developed on the basis of low-pressure casting technology, the working pressure range of the counter-pressure casting is 0.5-0.8MPa, compared with low-pressure casting, the metal liquid is solidified under the working pressure, the mechanical property of the casting can be further improved to a certain extent, but as micro shrinkage porosity and micro cracks in the casting cannot be eliminated, the density of the casting is low, and the requirement for producing the casting with high internal quality and high mechanical property is difficult to meet.
The high-pressure differential solidification technology is a new technology which combines the advantages of differential pressure casting and semi-solid extrusion molding and complements the advantages of the two. The working pressure of the high-pressure counter-pressure casting can reach 3.0MPa, which is far higher than that of the traditional counter-pressure casting, the molten metal is filled in the high-pressure counter-pressure casting machine, the filling capacity can be improved, the complex thin-wall casting mold is filled, and the filling process is stable and controllable. The casting solidification process is completed under the action of high-pressure gas, so that the metal is densified, the defects of pinholes, micro shrinkage porosity, cracks and the like are eliminated, and the mechanical property of the casting is obviously improved.
The high-pressure differential pressure casting not only requires the improvement of the pressure resistance of a lower pressure tank where a crucible for storing molten metal is located, an upper pressure tank for placing a casting mold and a pipeline, but also provides higher precision and pressure resistance requirements for a high-pressure regulation control system for regulating the pressure of the upper pressure tank and the lower pressure tank, the control precision of a common proportional regulating valve is not high, the common proportional regulating valve cannot be suitable for the liquid level pressurization control precision of high-precision differential pressure casting, and a high-precision proportional regulating valve cannot be suitable for the regulation of high-pressure due to small flow and low static pressure, so that the pressure regulation control system suitable for the traditional differential pressure casting cannot be suitable for the high-pressure regulation of the high-pressure differential pressure casting, and a new high-pressure differential pressure casting pressure regulation control system must be designed.
Disclosure of Invention
The invention provides a high-pressure differential casting pressure regulation control system with high-precision and high-pressure regulation, aiming at solving the problem that the existing differential casting machine cannot realize high-pressure and high-precision regulation in the high-pressure differential casting process. The application of the technology can realize the adjustment and control of the high pressure of the high-pressure counter-pressure casting, thereby ensuring the precision of the high-pressure counter-pressure casting, greatly improving the performance level of some important components, replacing the casting and forging composite technology, simultaneously expanding the production range of the complex thin-wall components by adopting the casting method, improving the production efficiency, reducing the cost and obtaining remarkable technical and economic benefits.
The pressure regulation control system for high-pressure differential casting comprises a pressure regulation module and high-pressure differential casting equipment, wherein the high-pressure differential casting equipment comprises an upper pressure tank, a lower pressure tank and a buffer tank; the buffer tank stores high-pressure gas and provides gas pressure for high-pressure differential casting; the pressure regulating module comprises a central controller, a stop valve, a digital valve group and a differential pressure sensor; the pressure difference sensor detects the pressure difference between the upper pressure tank and the lower pressure tank in real time and transmits the pressure difference to the central controller, and the central controller is connected with the stop valve, the digital valve group and the pressure difference sensor to form a closed-loop control system, so that the pressure difference between the upper pressure tank and the lower pressure tank is adjusted and controlled in real time, and the adjustment and control of the pressure of the high-pressure differential pressure casting are realized.
Furthermore, the stop valve adopts a high static pressure stop valve for adapting to the regulation of high pressure, and the digital valve bank is composed of a plurality of high-precision common static pressure electromagnetic valves for ensuring the pressure regulation control precision, so that the digital valve bank is not influenced by the high pressure due to reasonable gas circuit arrangement, and the regulation and control of the high pressure required by high-pressure differential pressure casting can be realized under the common pressure-resistant condition.
Furthermore, the buffer tank controls the on-off of an air source through a first stop valve, and the speed of synchronous air intake is controlled through a digital valve group A; a third stop valve is arranged between the digital valve group A and the lower pressure tank; a second stop valve and a fourth stop valve are arranged between the pressure tanks on the figure A of the digital valve group; and a fifth stop valve and a digital valve group B are also arranged between the second stop valve and the fourth stop valve.
The digital valve group A, the first stop valve, the second stop valve, the third stop valve and the fourth stop valve form a synchronous air inlet path adjusting control system, the central controller acquires data of a pressure difference sensor connected with the upper pressure tank and the lower pressure tank to obtain the pressure difference of the upper pressure tank and the lower pressure tank, so that the pressure difference of the upper pressure tank and the lower pressure tank is controlled by controlling the on-off of the second stop valve, the third stop valve and the fourth stop valve, and the synchronous pressure difference between the upper pressure tank and the lower pressure tank is ensured to be within an error range.
Further, after the pressure of the upper tank and the lower tank reaches the required high pressure, when the pressure differential casting of the pressurization method is realized for the high-pressure differential casting, the air inlet pressurization is realized for the lower pressure tank through an air path consisting of the first stop valve, the second stop valve, the third stop valve and the digital valve A; when the pressure reduction counter-pressure casting is realized for the high-pressure counter-pressure casting, the upper pressure tank is exhausted and decompressed through a gas path formed by the second stop valve, the fourth stop valve, the fifth stop valve and the digital valve group B.
And after the pressure difference data of the differential pressure sensor is acquired and compared with the stored pressurization curve, the high pressure of the upper pressure tank and the high pressure of the lower pressure tank are regulated and controlled through the on-off of the stop valve and the on-off of the electromagnetic valves of the digital valve group A and the digital valve group B, so that the pressure difference of the upper pressure tank and the lower pressure tank strictly tracks the preset high pressure pressurization curve, and the mold filling process of high-pressure differential pressure casting is realized. The molten metal solidifies and crystallizes under this high pressure, so that a high-performance casting which is denser than differential pressure casting is obtained. And after the pressure is maintained for the set time, synchronously exhausting the upper pressure tank and the lower pressure tank through the second stop valve, the third stop valve, the fourth stop valve and the fifth stop valve, and finishing the exhaust process of high-pressure differential pressure casting when the pressure of the upper pressure tank and the pressure of the lower pressure tank are zero. Thereby finally completing the high-pressure differential casting process.
In conclusion, the pressure regulating and controlling system not only has the pressure regulating and controlling function of high-pressure counter-pressure casting, but also has the functions of traditional counter-pressure casting and low-pressure casting, and is a multifunctional combined counter-gravity casting pressure regulating and controlling system.
Drawings
FIG. 1 is a block diagram of a high-pressure differential casting pressure regulation control system according to an embodiment of the present invention.
Detailed Description
Hereinafter, the high-pressure differential casting pressure regulation control system according to the present invention will be described in more detail based on embodiments with reference to the accompanying drawings.
The first embodiment is as follows: referring to the attached drawing 1, the high-pressure differential pressure casting pressure regulation control system is used in cooperation with high-pressure differential pressure casting, and the high-pressure differential pressure casting equipment comprises an upper pressure tank, a lower pressure tank and a buffer tank; the buffer tank stores high-pressure gas and provides gas pressure for high-pressure differential casting; the pressure difference sensor collects the pressure difference between the upper pressure tank and the lower pressure tank in real time and sends the detected pressure difference value to the central controller. The pressure regulating system comprises a central control unit, a stop valve, a digital valve group and a differential pressure sensor.
In a second specific embodiment, referring to fig. 1, when the high-pressure differential pressure casting pressure regulation control system implements high-pressure differential pressure casting synchronous air intake, a first stop valve is connected with a buffer tank and a digital valve bank a, a third stop valve is connected with the digital valve bank a and a lower pressure tank, and a fourth stop valve is connected with an upper pressure tank, a second stop valve is connected with the third and fourth stop valves, the digital valve bank a controls the speed of synchronous air intake, and a central controller acquires data of a differential pressure sensor connected to the upper and lower pressure tanks to obtain a pressure difference between the upper and lower pressure tanks, so that the pressure difference between the upper and lower pressure tanks is controlled by controlling the on-off states of the second, third and fourth stop valves, and the synchronous pressure difference between the upper and lower pressure tanks is ensured to be within an error range;
the third concrete implementation mode: referring to fig. 1, when the high-pressure differential casting realizes differential casting by a pressurization method, a first stop valve is connected with a buffer tank and a digital valve group a, and a third stop valve is connected with a digital valve a and a lower pressure tank to realize pressurization of the lower pressure tank; when the high-pressure differential casting realizes pressure reduction differential casting, the upper pressure tank is connected with the upper pressure tank through a fourth stop valve, and the upper pressure tank is exhausted and subjected to pressure reduction through a digital valve bank B; the central controller acquires pressure difference data of the differential pressure sensor, compares the pressure difference data with a pressurization curve stored in the central controller in advance, adjusts and controls the high-pressure of the upper tank and the lower tank through the on-off of the stop valve and the on-off of the electromagnetic valves of the digital valve group A and the digital valve group B, ensures that the pressure difference of the upper tank and the lower tank strictly tracks the preset high-pressure pressurization curve, and realizes the mold filling process of high-pressure differential pressure casting.
The fourth concrete implementation mode: referring to the attached drawing 1, after the high-pressure differential casting reaches the pressure maintaining set time, synchronous exhaust is realized by connecting a fourth stop valve with an upper pressure tank, connecting a third stop valve with a lower pressure tank, and connecting a second stop valve with a third stop valve and a fourth stop valve, and when the pressure of the upper tank and the pressure of the lower tank are zero, the exhaust process of the high-pressure differential casting is completed. Thereby finally completing the high-pressure differential casting process.
The fourth concrete implementation mode: referring to fig. 1, the high-pressure counter-pressure casting pressure regulation control system of the present embodiment can also realize conventional counter-pressure casting, which is implemented in the same manner as the third embodiment except that the working pressure range is 0.5-0.8 MPa.
The fourth concrete implementation mode: referring to fig. 1, the high-pressure differential pressure casting pressure regulation control system of the embodiment can also realize traditional low-pressure casting, the process is realized by connecting the digital valve bank a and the buffer tank through the first stop valve, and connecting the digital valve bank a and the lower pressure tank through the third stop valve, the central controller controls the on-off of the digital valve bank by collecting data of the differential pressure sensor and outputting a 'PCM' control code through calculation and judgment, so that the accurate control of a pressure value is realized, and the low-pressure casting process is completed.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (6)
1. The utility model provides a pressure regulation control system of high pressure differential casting, includes the high pressure differential casting equipment that last overhead tank, overhead tank and buffer tank constitute, its characterized in that: the pressure regulating module comprises a central controller, a stop valve, a digital valve bank and a differential pressure sensor; the central controller is connected with the stop valve, the digital valve group and the differential pressure sensor to form a closed-loop control system, and the differential pressure sensor is connected with the upper pressure tank and the lower pressure tank.
2. The high pressure differential casting pressure regulation control system of claim 1, wherein: the digital valve bank is a high-precision electromagnetic valve bank with common static pressure and is used for adjusting the through-flow capacity of a pipeline in high-pressure differential pressure casting.
3. The high pressure differential casting pressure regulation control system of claim 1, wherein: the stop valve is a high static pressure pneumatic stop valve, controls the flow direction of a gas circuit in high-pressure differential pressure casting, and bears the high static pressures of an upper pressure tank, a lower pressure tank and a buffer tank.
4. The high pressure differential casting pressure regulation control system of claim 1, wherein: the buffer tank controls the on-off of an air source through a first stop valve, and the speed of synchronous air intake is controlled through a digital valve group A; a third stop valve is arranged between the digital valve group A and the lower pressure tank; a second stop valve and a fourth stop valve are arranged between the pressure tanks on the figure A of the digital valve group; and a fifth stop valve and a digital valve group B are also arranged between the second stop valve and the fourth stop valve.
5. The high-pressure differential casting pressure regulation control system according to any one of claims 1 to 4, wherein: when the pressure increase method counter-pressure casting is realized by the high-pressure counter-pressure casting, the lower pressure tank is subjected to air inlet pressurization through an air path consisting of the first stop valve, the second stop valve, the third stop valve and the digital valve A; when the pressure reduction counter-pressure casting is realized for the high-pressure counter-pressure casting, the upper pressure tank is exhausted and decompressed through a gas path formed by the second stop valve, the fourth stop valve, the fifth stop valve and the digital valve group B.
6. The high pressure differential casting pressure regulation control system of claim 1, wherein: and after the pressure difference data of the differential pressure sensor is acquired and compared with the stored pressurization curve, the high pressure of the upper tank and the lower tank is regulated and controlled through the on-off of the stop valve and the on-off of the electromagnetic valves of the digital valve group A and the digital valve group B, the pressure difference of the upper tank and the lower tank is ensured to strictly track the preset high-pressure pressurization curve, and the mold filling process of high-pressure differential pressure casting is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010311749.3A CN111299546A (en) | 2020-04-20 | 2020-04-20 | Pressure regulation control system for high-pressure differential pressure casting |
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| CN202010311749.3A CN111299546A (en) | 2020-04-20 | 2020-04-20 | Pressure regulation control system for high-pressure differential pressure casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333715A (en) * | 2021-05-28 | 2021-09-03 | 重庆长安汽车股份有限公司 | Low-pressure casting mold-filling pressure curve design method based on back pressure |
| CN114226690A (en) * | 2021-11-20 | 2022-03-25 | 河南信持睿电气设备有限公司 | Control method for aluminum alloy counter-pressure casting and casting device |
| CN115365478A (en) * | 2022-08-12 | 2022-11-22 | 中国兵器装备集团西南技术工程研究所 | Nonlinear pressurization control method and system for casting and forming of complex metal component |
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2020
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333715A (en) * | 2021-05-28 | 2021-09-03 | 重庆长安汽车股份有限公司 | Low-pressure casting mold-filling pressure curve design method based on back pressure |
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| CN114226690A (en) * | 2021-11-20 | 2022-03-25 | 河南信持睿电气设备有限公司 | Control method for aluminum alloy counter-pressure casting and casting device |
| CN115365478A (en) * | 2022-08-12 | 2022-11-22 | 中国兵器装备集团西南技术工程研究所 | Nonlinear pressurization control method and system for casting and forming of complex metal component |
| CN115365478B (en) * | 2022-08-12 | 2023-08-29 | 中国兵器装备集团西南技术工程研究所 | Nonlinear pressurization control method and system for casting and forming complex metal component |
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