CN110985455A - Efficient precise injection system - Google Patents
Efficient precise injection systemDownload PDFInfo
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- CN110985455A CN110985455ACN201911401966.5ACN201911401966ACN110985455ACN 110985455 ACN110985455 ACN 110985455ACN 201911401966 ACN201911401966 ACN 201911401966ACN 110985455 ACN110985455 ACN 110985455A
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- 238000002347injectionMethods0.000titleclaimsabstractdescription82
- 239000007924injectionSubstances0.000titleclaimsabstractdescription82
- 238000000034methodMethods0.000claimsabstractdescription29
- 238000006073displacement reactionMethods0.000claimsabstractdescription17
- 238000007789sealingMethods0.000claimsabstractdescription11
- 238000004891communicationMethods0.000claimsabstractdescription7
- 238000004146energy storageMethods0.000claimsdescription9
- 239000002184metalSubstances0.000description7
- 238000004512die castingMethods0.000description6
- 238000001125extrusionMethods0.000description5
- 239000007788liquidSubstances0.000description5
- 238000005266castingMethods0.000description3
- 238000005429filling processMethods0.000description3
- 229910001338liquidmetalInorganic materials0.000description3
- 238000010586diagramMethods0.000description2
- 238000005265energy consumptionMethods0.000description2
- 230000007547defectEffects0.000description1
- 230000033001locomotionEffects0.000description1
- 238000003825pressingMethods0.000description1
- 238000007711solidificationMethods0.000description1
- 230000008023solidificationEffects0.000description1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- 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
- B22D17/2015—Means for forcing the molten metal into the die
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Translated fromChinese
Description
Technical Field
The invention relates to a hydraulic system used on a metal die casting machine or a metal extruding machine and used for extruding liquid metal into a die to form a precise die casting part, in particular to an efficient precise injection system.
Background
In a traditional injection hydraulic system, a conventional oil cylinder is used for injecting liquid into a die, and finally a pressurizing piston is used for pressurizing to obtain a die-casting part. The system has low efficiency, and the idle consumption of the injection process is often the link of the maximum energy consumption of the die casting machine. And secondly, the conventional injection process has poor control performance, and the precision and the quality of the die-cast part are not ideal.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a high-efficiency precise injection hydraulic system which is low in space consumption and high in efficiency and ensures the precision and stability of an injection process.
According to the technical scheme provided by the invention, the high-efficiency precision injection system comprises a displacement sensor, a two-stage injection oil cylinder, a first electric control valve, a second electric control valve, a third electric control valve, a fourth electric control valve and a servo valve;
a first piston, a first piston inner cavity, a second piston inner cavity, a sealing plate, a first oil cavity, a second oil cavity, a third oil cavity, a communication hole, a first oil cavity interface, a second oil cavity interface and a third oil cavity interface are arranged in the double-stage injection oil cylinder;
a first piston in the double-stage injection oil cylinder divides an internal cavity of the injection oil cylinder into a first oil cavity and a second oil cavity, a displacement sensor is arranged on a first piston rod of the first piston, a first piston inner cavity is formed in the first piston, a second piston is arranged in the first piston inner cavity in a sliding manner, a second piston rod is integrally fixed in the injection oil cylinder, the other end of the second piston rod is fixed with the second piston, a sealing plate is fixed on the first piston, a third oil cavity is formed in the first piston inner cavity between the sealing plate and the second piston, and a third oil cavity is formed in the second piston inner cavity between the sealing plate and the second pistonA second piston inner cavity is formed in the two piston rods, a communication hole for communicating the second piston inner cavity with the third oil cavity is formed in the second piston rod, a first oil cavity interface, a second oil cavity interface and a third oil cavity interface are formed in the injection oil cylinder, the first oil cavity interface is communicated with the first oil cavity, the second oil cavity interface is communicated with the second oil cavity, and the third oil cavity interface is communicated with the second piston inner cavity; the acting areas of the first oil chambers are respectively A1The effective area of the second oil chamber is A2The effective area of the third oil chamber is A3；
The first pressure oil supply pipeline is connected with an oil inlet interface of the fourth electric control valve, an oil outlet interface of the fourth electric control valve is connected with a first interface of a first tee joint, a second interface of the first tee joint is connected with an oil inlet interface of the third electric control valve, an oil outlet interface of the third electric control valve is connected with an oil return pipeline, and a third interface of the first tee joint is connected with a third oil cavity interface;
the second pressure oil supply pipeline is connected with an oil inlet interface of the servo valve, an oil outlet interface of the servo valve is connected with a first interface of a second tee joint, a second interface of the second tee joint is connected with a first oil cavity interface, a third interface of the second tee joint is connected with an oil inlet interface of a second electric control valve, an oil outlet interface of the second electric control valve is connected with a first interface of a third tee joint, a second interface of the third tee joint is connected with a second oil cavity interface, a third interface of the third tee joint is connected with an oil inlet interface of the first electric control valve, and an oil outlet interface of the first electric control valve is connected with an oil return pipeline.
The signal input end of the electronic amplifier is connected with the signal output end of the displacement sensor, and the signal output end of the electronic amplifier is connected with the signal input end of the servo valve.
The device also comprises an oil pump, a safety valve, a one-way valve, an energy storage accumulator and a pressure sensor;
an inlet interface of the oil pump is connected with an oil tank, an oil outlet interface of the oil pump is connected with a first interface of a fourth tee joint, a second interface of the fourth tee joint is connected with a first interface of a fifth tee joint, a second interface of the fifth tee joint is connected with a first pressure oil supply pipeline, a third interface of the fifth tee joint is connected with an oil inlet interface of a one-way valve, an oil outlet interface of the one-way valve is connected with a first interface of a first four-way joint, a second interface of the first four-way joint is connected with a second pressure oil supply pipeline, a third interface of the first four-way joint is connected with a pressure sensor, and a fourth interface of the first four-way joint is connected with; the third interface of the fourth tee joint is connected with the first interface of the sixth tee joint, the second interface of the sixth tee joint is connected with the oil inlet interface of the safety valve, the oil outlet interface of the safety valve is connected with the oil return pipeline, and the oil discharge port of the safety valve is connected with the third interface of the sixth tee joint.
The first piston rod of the first piston can generate three different injection thrust outputs by means of different combinations of the first electric control valve, the second electric control valve, the third electric control valve and the fourth electric control valve.
The servo valve and the displacement sensor form real-time closed-loop control, and the injection speed and the injection thrust of the first piston rod of the first piston can be accurately and reliably controlled.
In the return stroke process, the oil pump directly sends oil into the first piston inner cavity through the first oil cavity interface and the second piston inner cavity, and high-pressure oil of the energy storage energy accumulator is not consumed in the return stroke process.
The invention can reasonably select A1、A2、A3The area of the injection cylinder is matched with the requirements of each process on the injection force F, so that the idle consumption of the injection cylinder can be reduced to the minimum, and the system efficiency is improved. In addition, the injection system can be closed-loop controlled in real time in the whole process, so that the precision and the stability of the injection process are ensured.
Drawings
Fig. 1 is a schematic diagram of the present invention.
FIG. 2 is a diagram of an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The high-efficiency precise injection system comprises a displacement sensor 6, aninjection oil cylinder 7, a first electric control valve DF1, a second electric control valve DF2, a third electric control valve DF3, a fourth electric control valve DF4 and a servo valve SF;
theinjection cylinder 7 is internally provided with afirst piston 71, a first pistoninner cavity 711, a second piston 72, a second pistoninner cavity 721, asealing plate 73,First oil chamber S1A second oil chamber S2A third oil chamber S3And a communicating hole S4The first oil cavity interface JK1, the second oil cavity interface JK2 and the third oil cavity interface JK 3;
thefirst piston 71 inside theshot cylinder 7 divides the internal cavity of theshot cylinder 7 into first oil chambers S1And the second oil chamber S2A displacement sensor 6 is attached to a first piston rod of thefirst piston 71, afirst piston cavity 711 is formed in thefirst piston 71, a second piston 72 is slidably attached to thefirst piston cavity 711, a second piston rod is integrally fixed to theinjection cylinder 7, the other end of the second piston rod is fixed to the second piston 72, aseal plate 73 is fixed to thefirst piston 71, and a third oil chamber S is formed in thefirst piston cavity 711 between theseal plate 73 and the second piston 723A second pistoninner chamber 721 is formed in the second piston rod, and a communication hole S for communicating the second pistoninner chamber 721 with the third oil chamber S3 is formed in the second piston rod4A first oil cavity interface JK1, a second oil cavity interface JK2, a third oil cavity interface JK3, a first oil cavity interface JK1 and a first oil cavity S are arranged on theinjection oil cylinder 71Communicated with the second oil cavity interface JK2 and the second oil cavity S2The third oil chamber interface JK3 is communicated with the second pistoninner chamber 721;
the first pressure oil supply pipeline is connected with an oil inlet interface of a fourth electric control valve DF4, an oil outlet interface of the fourth electric control valve DF4 is connected with a first interface of a first tee joint, a second interface of the first tee joint is connected with an oil inlet interface of a third electric control valve DF3, an oil outlet interface of the third electric control valve DF3 is connected with an oil return pipeline, and a third interface of the first tee joint is connected with a third oil cavity interface JK 3;
the second pressure oil supply pipeline is connected with an oil inlet interface of the servo valve SF, an oil outlet interface of the servo valve SF is connected with a first interface of a second tee joint, a second interface of the second tee joint is connected with a first oil cavity interface JK1, a third interface of the second tee joint is connected with an oil inlet interface of a second electric control valve DF2, an oil outlet interface of a second electric control valve DF2 is connected with a first interface of a third tee joint, a second interface of the third tee joint is connected with a second oil cavity interface JK2, a third interface of the third tee joint is connected with an oil inlet interface of a first electric control valve DF1, and an oil outlet interface of the first electric control valve DF1 is connected with an oil return pipeline.
The system is characterized by further comprising an electronic amplifier 9, wherein a signal input end of the electronic amplifier 9 and a signal output end of the displacement sensor 6 form position closed-loop control, a signal output end of the electronic amplifier 9 is connected with a signal input end of the servo valve SF, displacement and speed curves required by the die-casting process are stored in a ROM register, the injection oil cylinder is subjected to closed-loop control through the electronic amplifier 9, and the whole system can operate under the control of a PLC (programmable logic controller).
When the concrete implementation is carried out, an external oil supply system is required to be matched as follows: the system comprises an oil pump 1, asafety valve 2, a one-way valve 3, an energy storage accumulator 4, a pressure sensor 5 and the like.
Adopts a two-stageinjection oil cylinder 7 with a special design and a double-sleeve structure to form three oil cavities, namely a first oil cavity S1A second oil chamber S2And a third oil chamber S3(ii) a The outside of theinjection oil cylinder 7 is connected with 4 first electric control valves DF1, second electric control valves DF2, third electric control valves DF3 and fourth electric control valves DF4 without leakage, under the control of a PLC, 4 kinds of injection motions with different sizes and directions can be formed by means of different connection of the 4 electric control valves so as to match the requirements of different injection processes on injection force and injection speed, so that the energy consumption efficiency of the hydraulic injection system is improved, and the idle consumption is reduced to the lowest.
In addition, a servo valve SF is connected to the main oil line to allow closed-loop fine control of the speed of the injection cylinder. The precision and the stability of the injection process are ensured.
The system principle of the invention is shown in figure 1; theinjection cylinder 7 takes a double-sleeve structure, thereby forming a first oil chamber S1A second oil chamber S2And a third oil chamber S3(ii) a Their effective areas are respectively A1、A2And A3. The first electric control valve DF1, the second electric control valve DF2, the third electric control valve DF3 and the fourth electric control valve DF4 control the first oil chamber S1A second oil chamber S2And a third oil chamber S3The three oil chambers and the oil source P0Or the oil tank T. First oil chamber S1Connected to it is a high-speed proportional servo valve SF which controls the first oil chamber S1Internal oil pressure P1A position closed-loop control system may be constituted with the displacement sensor 6 mounted on the piston rod of thefirst piston 71 so as to smoothly control the injection speed V or the pressing force F of theinjection cylinder 7 throughout the stroke in accordance with a control instruction.
Thefirst piston 71 inside theshot cylinder 7 divides the inner cavity of the shot cylinder into first oil chambers S1And the second oil chamber S2A second piston 72 is mounted inside thefirst piston 71, one end of the second piston rod is fixed to the cylinder, the other end of the second piston rod is fixed to the second piston, asealing plate 73 is fixed to the first piston, and a third oil chamber S is formed between thesealing plate 73 and the second piston3An oil through hole is formed in the second piston rod;
pressure oil P0The first three-way valve is connected with a first three-way valve through an inlet, a first outlet end of the first three-way valve is connected with an inlet end of a fourth electromagnetic valve DF4, and a second outlet end of the first three-way valve is connected with an inlet end of a servo valve SF;
the outlet end of the servo valve SF is connected with the inlet end of a second tee joint, and the first outlet end of the second tee joint is connected with a first oil cavity S1The second outlet end of the second tee joint is connected with the inlet end of a second electromagnetic valve DF2, the outlet end of a second electromagnetic valve DF2 is connected with the first inlet end of a third tee joint, and a second oil chamber S2The outlet end of the third tee joint is connected with the inlet end of a first electromagnetic valve DF1, and the outlet end of the first electromagnetic valve DF1 is connected to an oil return pipe of the oil tank through a fourth tee joint.
When the second solenoid valve DF2 and the fourth solenoid valve DF4 are turned on, the shot force F at this time is at a minimum of F ═ a (a)1-A2)×P1-A3×P0Can be used as a molten metal injection mold.
When the second solenoid valve DF2 and the third solenoid valve DF3 are turned on, the injection force F at this time is slightly larger than F (a)1-A2)×P1The metal liquid is filled into the mould.
When the first solenoid valve DF1 and the third solenoid valve DF3 are turned on, the injection force fmax F at this time is a1×P1The casting can be fully compacted.
When the first DF1, second DF2 and fourth DF4 solenoid valves are on, the shot force F at this time is reversed, emptying the cartridge and preparing for refilling.
When the oil pressure sensor works, the oil pump 1 driven by the motor pumps oil out of the oil tank and presses the oil into the energy storage 4 through the one-way valve 3, the pressure sensor 5 detects the oil pressure of the energy storage 4, and when the oil pressure reaches the upper limit PmaxWhen the oil pressure is lower than the lower limit P, the motor is stoppedminDuring the process, oil is supplemented into the energy accumulator 4 from a new starting motor, so that sufficient pressure oil is always provided at the inlet of the servo valve SF, and the servo valve SF is ensured to stably control the injection speed or the extrusion pressure of the injection oil cylinder. The outlet of the oil pump 1 is additionally connected with asafety valve 2, and when the pressure compensating system fails, the oil pump 1 can be protected from being damaged due to overpressure.
The metal injection can be roughly divided into four steps;
1. liquid injection process: the liquid metal is injected into the mold cavity with only a small pushing force due to the good fluidity of the liquid metal.
2. And (3) a mold filling process: as the die cavity is progressively filled with metal, the shot runner resistance increases, requiring higher pressures to fully fill the die.
3. And (3) extrusion process: the mold cavity is completely filled with metal and the surface of the casting has partially solidified. To make the casting fit finely to the mold cavity and to compensate for shrinkage porosity during solidification, the shot system needs to add a large shot force, e.g., above 80Mpa, for several seconds.
4. And (3) a return process: the injection cylinder returns to the initial position to take out the parts, and the charging barrel is emptied to prepare for the next die casting. The oil cylinder returns basically under the idle state.
During the liquid injection process: the first electric control valve DF1 and the third electric control valve DF3 are closed, the second electric control valve DF2 and the fourth electric control valve DF4 are opened,
so that the shot force F is equal to (A)1-A2)P1-A1P0(ii) a If the liquid injection process stroke is L1The required oil amount is Q1＝L1×(A1-A2-A3)。
During the mold filling process: the first electric control valve DF1 and the fourth electric control valve DF4 are closed, the second electric control valve DF2 and the fourth electric control valve DF4 are opened,
the injection force F ═ A1-A2)×P1The stroke of the mold filling process is L2，
Oil quantity Q required by mold filling2＝L2×(A1-A2)。
During the extrusion process: the first electric control valve DF1 and the third electric control valve DF3 are opened, the second electric control valve DF2 and the fourth electric control valve DF4 are closed,
the injection force F is equal to A1×P1The stroke of the extrusion process is L3，
The oil quantity required by extrusion is Q3＝L3×A1。
During return stroke: the first electrical control valve DF1, the second electrical control valve DF2, the fourth electrical control valve DF4 are opened, the third electrical control valve DF3 is closed,
the oil pump directly sends the oil into the third oil cavity S in the return process3High pressure oil of the accumulator is not consumed during return stroke, and the return stroke pressure P is small because of the small return stroke resistanceRAnd is also small, and the power consumption of the motor is low.
Table 1 lists the thrust and oil quantities of the various process cylinders.
TABLE 1
The analysis shows that the area ratio A of the two-stage oil cylinder is reasonably selected1∶A2∶A3The injection force and the injection resistance can be well matched, the hydraulic energy of an oil source is fully utilized, and the injection efficiency is greatly improved.
In the circuit of the invention, the displacement sensor 6, the electronic amplifier 9 and the high-speed proportional servo valve SF form a closed-loop control system, and the speed and the pressure of each section in the injection process can be controlled by the high-speed proportional servo valve SF. Therefore, the precision and stability of the injection process are reliably ensured.
The first piston rod of thefirst piston 71 is capable of producing three different shot thrust outputs by virtue of the different combinations of the first electrical valve DF1, the second electrical valve DF2, the third electrical valve DF3 and the fourth electrical valve DF 4.
The real-time closed-loop control composed of the servo valve SF and the displacement sensor 6 can accurately and reliably control the injection speed and the injection thrust force of the first piston rod of thefirst piston 71.
In the return stroke process, the oil pump 1 directly sends the oil into the first pistoninner cavity 711 through the first oil cavity interface JK1 and the second pistoninner cavity 721, high-pressure oil of the energy storage energy accumulator 4 is not consumed in the return stroke process, the return stroke pressure is small due to small return stroke resistance, and at the moment, the power consumption of a motor of the oil pump 1 is low.
Claims (6)
Translated fromChinesePriority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911401966.5ACN110985455B (en) | 2019-12-31 | 2019-12-31 | High-efficiency precision injection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911401966.5ACN110985455B (en) | 2019-12-31 | 2019-12-31 | High-efficiency precision injection system |
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| Publication Number | Publication Date |
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| CN110985455Atrue CN110985455A (en) | 2020-04-10 |
| CN110985455B CN110985455B (en) | 2025-02-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032114A (en)* | 2020-09-07 | 2020-12-04 | 宁波力劲科技有限公司 | Closed-loop real-time control system and control method for pressurization pressure of die casting machine |
| CN113153862A (en)* | 2021-04-15 | 2021-07-23 | 天地科技股份有限公司 | Digital oil cylinder and control method thereof |
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- 2019
- 2019-12-31CNCN201911401966.5Apatent/CN110985455B/enactiveActive
Patent Citations (6)
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| US5052468A (en)* | 1989-09-20 | 1991-10-01 | Diecasting Machinery & Rebuilding Co. | Method and apparatus for die casting shot control |
| US5630463A (en)* | 1994-12-08 | 1997-05-20 | Nelson Metal Products Corporation | Variable volume die casting shot sleeve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112032114A (en)* | 2020-09-07 | 2020-12-04 | 宁波力劲科技有限公司 | Closed-loop real-time control system and control method for pressurization pressure of die casting machine |
| CN113153862A (en)* | 2021-04-15 | 2021-07-23 | 天地科技股份有限公司 | Digital oil cylinder and control method thereof |
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