CN114101623A - Local pressurizing device for die casting - Google Patents
Local pressurizing device for die casting Download PDFInfo
- Publication number
- CN114101623A CN114101623A CN202111423208.0A CN202111423208A CN114101623A CN 114101623 A CN114101623 A CN 114101623A CN 202111423208 A CN202111423208 A CN 202111423208A CN 114101623 A CN114101623 A CN 114101623A
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- die
- oil
- pressurizing
- valve
- 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
- B22D17/2015—Means for forcing the molten metal into the die
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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
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2069—Exerting after-pressure on the moulding material
-
- 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
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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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
Abstract
The invention discloses a local pressurizing device for die casting, and belongs to the technical field of die casting. The partial pressurization device comprises a die-casting assembly and at least one pressurization assembly. The die-casting assembly comprises a die carrier, a movable die and a fixed die, wherein the movable die is slidably arranged on the die carrier, the fixed die is fixed on the die carrier, and a die cavity is formed between the movable die and the fixed die. The pressurizing assembly comprises a pressurizing part and a pressurizing rod, the pressurizing part comprises an oil tank, an oil pump, an energy accumulator, a proportional reversing valve and a hydraulic oil cylinder, an oil outlet of the oil tank is communicated with the oil pump and the energy accumulator in sequence, a second working oil port of the proportional reversing valve is communicated with a rod cavity of the hydraulic oil cylinder, a piston rod of the hydraulic oil cylinder is in transmission connection with one end of the pressurizing rod, and the other end of the pressurizing rod is movably inserted in the die cavity. According to the local pressurizing device for die casting provided by the embodiment of the invention, the local pressurizing of the casting can be realized through the pressurizing rod in the die casting process, and the pressurizing pressure of the pressurizing rod can be adjusted.
Description
Technical Field
The invention belongs to the technical field of die casting, and particularly relates to a local pressurizing device for die casting.
Background
The die casting is a precise casting method for filling metal liquid into a cavity with a complex shape at a high speed by utilizing high pressure force, and has the advantages of high production efficiency, higher tolerance level of a casting, high surface precision and excellent casting strength, so the die casting is widely applied to the industries of electronics, automobiles, locomotives, airplanes and the like.
The defects of shrinkage cavity, shrinkage porosity and the like are often generated by adopting a common die-casting method, so that a product cannot pass a leakage test under high pressure and cannot meet the design and use requirements.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a local pressurizing device for die casting, which aims to realize local pressurization on a casting through a pressurizing rod and adjust the pressurizing pressure of the pressurizing rod, so that the defects of shrinkage cavity, shrinkage porosity and the like of the casting are avoided, and the die casting effect of the casting is improved.
The invention provides a local pressurizing device for die casting, which comprises a die casting component and at least one pressurizing component;
the die-casting assembly comprises a die carrier, a movable die and a fixed die, the movable die is slidably arranged on the die carrier, the fixed die is fixed on the die carrier, and a die cavity is formed between the movable die and the fixed die;
the pressurizing assembly comprises a pressurizing piece and a pressurizing rod, the pressurizing piece comprises an oil tank, an oil pump, an energy accumulator, a proportional reversing valve and a hydraulic oil cylinder, an oil outlet of the oil tank is sequentially communicated with the oil pump and the energy accumulator, an oil inlet of the proportional reversing valve is communicated with the energy accumulator, an oil return port of the proportional reversing valve is communicated with an oil return port of the oil tank, a first working oil port of the proportional reversing valve is communicated with a rodless cavity of the hydraulic oil cylinder, a second working oil port of the proportional reversing valve is communicated with a rod cavity of the hydraulic oil cylinder, a piston rod of the hydraulic oil cylinder is in transmission connection with one end of the pressurizing rod, and the other end of the pressurizing rod is movably inserted into the die cavity to pressurize a casting locally.
Optionally, the pressure piece further comprises a pressure sensor located at the oil inlet of the accumulator to monitor the pressure of the accumulator.
Optionally, the pressurizing piece further comprises a manual unloading valve, an oil inlet of the manual unloading valve is communicated with the energy accumulator, and an oil outlet of the manual unloading valve is communicated with an oil return port of the oil tank.
Optionally, the pressurizing part further comprises an electromagnetic unloading ball valve, an oil inlet of the electromagnetic unloading ball valve is communicated with the energy accumulator, and an oil outlet of the electromagnetic unloading ball valve is communicated with an oil return opening of the oil tank.
Optionally, the pressurizing member further comprises a controller, the proportional reversing valve is an electromagnetic valve, and the controller is electrically connected with the pressure sensor and the proportional reversing valve respectively.
Optionally, a cooler is arranged between the oil return port of the proportional reversing valve and the oil return port of the oil tank.
Optionally, a filter is arranged between the oil outlet of the oil tank and the oil inlet of the oil pump.
Optionally, a check valve is arranged between the oil outlet of the oil pump and the oil inlet of the accumulator.
Optionally, the pressurizing assembly further comprises a connecting shaft, one end of the connecting shaft is in transmission connection with a piston rod of the hydraulic oil cylinder, and the other end of the connecting shaft is in transmission connection with one end of the pressurizing rod.
Optionally, the die carrier includes movable die carrier and cover half frame, movable die carrier with cover half frame fixed connection is in the same place, the movable mould slidable arranges on the movable die carrier, the cover half is fixed on the cover half frame.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
for the local pressurizing device for die casting provided by the embodiment of the invention, before the casting is die-cast, the oil pump is started, and the oil pump pumps the hydraulic oil in the oil tank into the energy accumulator, so that the hydraulic oil of the energy accumulator is stored and pressurized, and the high-pressure hydraulic oil is provided subsequently. At this time, the proportional directional valve is in an open state.
And when the casting is die-cast, the movable die is moved, so that the movable die and the fixed die form a die cavity. The mold cavity is then filled with a high velocity flow of liquid metal to form the casting. In the process of solidification of the casting, the proportional reversing valve is opened, high-pressure hydraulic oil in the energy accumulator sequentially flows into the oil inlet p of the proportional reversing valve, the first working oil port a and the rodless cavity of the hydraulic oil cylinder, and the piston rod of the hydraulic oil cylinder is driven to extend out under high pressure, so that the pressurizing rod is driven to extrude the casting, and the casting is locally pressurized. At the moment, the hydraulic oil in the rod cavity of the hydraulic oil cylinder flows back to the oil tank through the second working oil port b and the oil return port t of the proportional reversing valve, and the circulation of the hydraulic oil is realized.
Furthermore, when the casting is locally pressurized, the opening degree of a valve core in the proportional reversing valve can be adjusted, so that the flow entering the hydraulic oil cylinder is adjusted. According to the principle of an ideal gas state equation, the pressure of a rodless cavity of the hydraulic oil cylinder can be adjusted, so that the acting force of the piston rod of the hydraulic oil cylinder when the piston rod extends out is adjusted, and the pressurizing pressure of the pressurizing rod on the casting is adjusted (for example, the pressurizing pressure is increased), and the pressurizing effect is better.
Similarly, after the pressurization is finished, the valve core of the proportional reversing valve is controlled to reverse, so that the hydraulic oil can enter the rod cavity of the hydraulic oil cylinder after passing through the proportional reversing valve, and the hydraulic oil in the rodless cavity of the hydraulic oil cylinder flows back to the oil tank through the proportional reversing valve. At this time, the piston rod of the hydraulic oil cylinder drives the pressurizing rod to be recovered.
That is to say, the local pressurizing device for die-casting provided by the embodiment of the invention can not only realize local pressurization of the casting through the pressurizing rod in the die-casting process, but also adjust the pressurizing pressure of the pressurizing rod, thereby avoiding the defects of shrinkage cavity, shrinkage porosity and the like of the casting and improving the die-casting effect of the casting.
Drawings
Fig. 1 is a schematic structural diagram of a partial pressure device for die casting according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pressing member according to an embodiment of the present invention.
The symbols in the drawings represent the following meanings:
1. a die cast component; 11. a mold frame; 111. a movable mould frame; 112. fixing a mould frame; 1121. a sprue bush; 12. moving the mold; 13. fixing a mold; 14. a mold cavity; 2. a pressurizing assembly; 21. a pressing member; 211. an oil tank; 2111. a cooler; 2112. a filter; 2113. a one-way valve; 212. an oil pump; 213. an accumulator; 214. a proportional directional valve; 215. a hydraulic cylinder; 2151. a rodless cavity; 2152. a rod cavity; 216. a pressure sensor; 217. a manual unloader valve; 218. an electromagnetic unloading ball valve; 22. a pressurizing rod; 23. and (7) connecting the shafts.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic structural diagram of a partial pressure device for die casting according to an embodiment of the present invention, and as shown in fig. 1, the partial pressure device includes a die casting assembly 1 and at least one pressure assembly 2.
The die casting assembly 1 includes a die frame 11, a movable die 12 and a fixed die 13, the movable die 12 is slidably disposed on the die frame 11, the fixed die 13 is fixed on the die frame 11, and a die cavity 14 is formed between the movable die 12 and the fixed die 13.
Fig. 2 is a schematic structural diagram of a pressurizing member according to an embodiment of the present invention, and as shown in fig. 1 and fig. 2, the pressurizing assembly 2 includes a pressurizing member 21 and a pressurizing rod 22, the pressurizing member 21 includes an oil tank 211, an oil pump 212, an accumulator 213, a proportional directional valve 214 and a hydraulic cylinder 215, an oil outlet of the oil tank 211 is sequentially communicated with the oil pump 212 and the accumulator 213, an oil inlet p of the proportional directional valve 214 is communicated with the accumulator 213, an oil return port t of the proportional directional valve 214 is communicated with an oil return port of the oil tank 211, a first working oil port a of the proportional directional valve 214 is communicated with a rodless cavity 2151 of the hydraulic cylinder 215, a second working oil port b of the proportional directional valve 214 is communicated with a rod cavity 2152 of the hydraulic cylinder 215, a piston rod of the hydraulic cylinder 215 is drivingly connected with one end of the pressurizing rod 22, and the other end of the pressurizing rod 22 is movably inserted into the mold cavity 14 to partially pressurize the casting.
For the local pressurizing device for die casting provided by the embodiment of the invention, before the die casting is performed on the casting, the oil pump 212 is started, and the oil pump 212 pumps the hydraulic oil in the oil tank 211 into the energy accumulator 213, so that the hydraulic oil in the energy accumulator 213 is stored and pressurized, and the high-pressure hydraulic oil is provided subsequently. At this time, the proportional directional valve 214 is in an open state.
And, when die casting a casting, the movable mold 12 is moved so that the movable mold 12 and the fixed mold 13 form the cavity 14. The mold cavity 14 is then filled with a high velocity flow of liquid metal to form a casting. In the process of solidification of the casting, the proportional directional valve 214 is opened, and the high-pressure hydraulic oil in the energy accumulator 213 sequentially flows into the oil inlet p of the proportional directional valve 214, the first working oil port a and the rodless cavity 2151 of the hydraulic oil cylinder 215, so that the piston rod of the hydraulic oil cylinder 215 is driven to extend out with a larger pressure, and the pressurizing rod 22 is driven to extrude the casting, so as to locally pressurize the casting. At this time, the hydraulic oil in the rod chamber 2152 of the hydraulic cylinder 215 flows back to the oil tank 211 through the second working oil port b and the oil return port t of the proportional directional valve 214, and the circulation of the hydraulic oil is realized.
Further, the opening of the spool in the proportional directional valve 214 may be adjusted to regulate the flow into the hydraulic cylinder 215 when the casting is partially pressurized. According to the principle of the ideal gas equation of state, the pressure of the rodless cavity 2151 of the hydraulic oil cylinder 215 can be adjusted, so that the acting force when the piston rod of the hydraulic oil cylinder 215 extends can be adjusted, and the pressurizing pressure (such as the increase of the pressurizing pressure) of the pressurizing rod 22 on the casting can be adjusted, and the pressurizing effect is better.
Similarly, when the pressurization is completed, the spool of the proportional directional valve 214 is controlled to be reversed, so that the hydraulic oil can pass through the proportional directional valve 214 and then enter the rod chamber 2152 of the hydraulic cylinder 215, and the hydraulic oil in the rod-free chamber 2151 of the hydraulic cylinder 215 flows back to the oil tank 211 through the proportional directional valve 214. At this time, the piston rod of the hydraulic cylinder 215 drives the pressure rod 22 to retract.
That is to say, the partial pressure device for die-casting provided by the embodiment of the present invention can not only realize the partial pressure on the casting through the pressure rod 22 in the die-casting process, but also adjust the pressure of the pressure rod 22, thereby avoiding the defects of shrinkage cavity, shrinkage porosity and the like of the casting, and improving the die-casting effect of the casting.
The local pressurizing device provided by the invention is suitable for die casting and local pressurizing of castings with the wall thickness exceeding 20 mm. The proportional directional valve 214 is an integration of a proportional valve and a directional valve (a three-position four-way directional valve), and has the functions of reversing and adjusting the opening degree.
In the present embodiment, for example, the number of the pressing assemblies 2 may be 2, that is, there are 2 pressing rods 22, so that 2 opposite forces can be formed to act on the casting at the same time, and the effect of local pressing is better. In this case, the 2 pressurizing units 2 can share the same oil tank 211 and oil pump 212. In other embodiments of the present invention, the number of the pressing assemblies 2 may be 3 or 4, which is not limited by the present invention.
With continued reference to fig. 2, the pressure member 21 further includes a pressure sensor 216, the pressure sensor 216 being located at the oil inlet of the accumulator 213 to monitor the pressure of the accumulator 213.
In the above embodiment, the pressure sensor 216 can monitor the pressure in the accumulator 213 in real time, so as to prevent the accumulator 213 from having an excessive pressure, which may cause a safety hazard.
In addition, the pressurizing member 21 further comprises a manual unloading valve 217, an oil inlet of the manual unloading valve 217 is communicated with the energy accumulator 213, and an oil outlet of the manual unloading valve 217 is communicated with an oil return port of the oil tank 211, so that the energy accumulator 213 can be manually decompressed when the pressure of the energy accumulator 213 is too high.
Besides, the pressurizing member 21 further includes an electromagnetic unloading ball valve 218, an oil inlet of the electromagnetic unloading ball valve 218 is communicated with the energy accumulator 213, an oil outlet of the electromagnetic unloading ball valve 218 is communicated with an oil return port of the oil tank 211, so that the energy accumulator 213 can be automatically depressurized when the pressure of the energy accumulator 213 is too high (the electromagnetic unloading ball valve 218 can be automatically opened by an electric signal after exceeding the set pressure).
That is, double protection can be achieved by the manual unloading valve 217 and the electromagnetic unloading ball valve 218.
In this embodiment, the pressure member 21 further includes a controller, the proportional directional valve 214 is an electromagnetic valve, and the controller is electrically connected to the pressure sensor 216 and the proportional directional valve 214, respectively, so as to implement automatic control.
Illustratively, when the pressure sensor 216 monitors that the pressure of the hydraulic oil in the accumulator 213 reaches a set value, an electric signal is transmitted to the controller, and the controller controls the proportional directional valve 214 to open and regulates the opening of the proportional directional valve 214, so as to realize the local pressurization of the casting.
For example: when the controller receives the signal of the pressure sensor 216 and the pressure casting pressurization signal, the time delay is 2S, the pressurization is carried out at the depth of 0-10mm at the flow rate of less than 30%, and then the extrusion is carried out at the depth of 10-30mm at the flow rate of more than 30%.
The pressurization pressure may be, for example, 0 to 300 bar.
In the embodiment, a cooler 2111 is arranged between the oil return port of the proportional directional valve 214 and the oil return port of the oil tank 211, so that the returned hydraulic oil is cooled.
Illustratively, a filter 2112 is arranged between the oil outlet of the oil tank 211 and the oil inlet of the oil pump 212, so that hydraulic oil is filtered, and impurities are prevented from affecting the valve. The return of the tank 211 likewise has a filter 2112.
In addition, a check valve 2113 is provided between the oil outlet of the oil pump 212 and the oil inlet of the accumulator 213, thereby preventing the hydraulic oil from flowing backward.
Referring to fig. 1 again, the pressing assembly 2 further includes a connecting shaft 23, one end of the connecting shaft 23 is in transmission connection with the piston rod of the hydraulic cylinder 215, and the other end of the connecting shaft 23 is in transmission connection with one end of the pressing rod 22.
In the above embodiment, the connecting shaft 23 functions to connect the piston rod and the pressurizing rod 22, thereby extending the output length of the piston rod.
Illustratively, the outer diameter of the pressurizing rod 22 may be 8-16mm, and the pressurizing stroke of the pressurizing rod 22 may be 10-30 mm.
In the present embodiment, the mold frame 11 includes a movable mold frame 111 and a fixed mold frame 112, the movable mold frame 111 and the fixed mold frame 112 are fixedly connected together, the movable mold 12 is slidably disposed on the movable mold frame 111, and the fixed mold 13 is fixed on the fixed mold frame 112.
Illustratively, the stationary mold frame 112 has a sprue bushing 1121 therein, the sprue bushing 1121 communicating with the mold cavity 14 to facilitate the injection of liquid metal.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A partial pressurization device for die casting, characterized in that it comprises a die-casting assembly (1) and at least one pressurization assembly (2);
the die-casting assembly (1) comprises a die carrier (11), a movable die (12) and a fixed die (13), wherein the movable die (12) is slidably arranged on the die carrier (11), the fixed die (13) is fixed on the die carrier (11), and a die cavity (14) is formed between the movable die (12) and the fixed die (13);
the pressurizing assembly (2) comprises a pressurizing piece (21) and a pressurizing rod (22), the pressurizing piece (21) comprises an oil tank (211), an oil pump (212), an energy accumulator (213), a proportional reversing valve (214) and a hydraulic oil cylinder (215), an oil outlet of the oil tank (211) is sequentially communicated with the oil pump (212) and the energy accumulator (213), an oil inlet of the proportional reversing valve (214) is communicated with the energy accumulator (213), an oil return port of the proportional reversing valve (214) is communicated with an oil return port of the oil tank (211), a first working oil port of the proportional reversing valve (214) is communicated with a rodless cavity (2151) of the hydraulic oil cylinder (215), a second working oil port of the proportional reversing valve (214) is communicated with a rod cavity (2152) of the hydraulic oil cylinder (215), a piston rod of the hydraulic oil cylinder (215) is in transmission connection with one end of the pressurizing rod (22), the other end of the pressurizing rod (22) is movably inserted into the die cavity (14) to pressurize the casting part.
2. The partial pressurization device for die casting according to claim 1, characterized in that the pressurization member (21) further comprises a pressure sensor (216), the pressure sensor (216) being located at an oil inlet of the accumulator (213) to monitor the pressure of the accumulator (213).
3. The local pressurizing device for die casting according to claim 2, wherein the pressurizing member (21) further comprises a manual unloading valve (217), an oil inlet of the manual unloading valve (217) is communicated with the accumulator (213), and an oil outlet of the manual unloading valve (217) is communicated with an oil return port of the oil tank (211).
4. The local pressurizing device for die casting according to claim 2, wherein the pressurizing member (21) further comprises an electromagnetic unloading ball valve (218), an oil inlet of the electromagnetic unloading ball valve (218) is communicated with the accumulator (213), and an oil outlet of the electromagnetic unloading ball valve (218) is communicated with an oil return port of the oil tank (211).
5. The partial pressurizing device for die casting as claimed in claim 2, wherein the pressurizing member (21) further comprises a controller, the proportional directional valve (214) is a solenoid valve, and the controller is electrically connected to the pressure sensor (216) and the proportional directional valve (214), respectively.
6. The partial pressurization device for die casting according to claim 1, characterized in that a cooler (2111) is provided between the oil return port of the proportional directional valve (214) and the oil return port of the oil tank (211).
7. The partial pressurization device for die casting according to any one of claims 1 to 6, characterized in that a filter (2112) is provided between an oil outlet of the oil tank (211) and an oil inlet of the oil pump (212).
8. The partial pressurization device for die casting according to any one of claims 1 to 6, characterized in that a check valve (2113) is provided between an oil outlet of the oil pump (212) and an oil inlet of the accumulator (213).
9. The partial pressurizing device for die casting according to any one of claims 1 to 6, wherein the pressurizing assembly (2) further comprises a connecting shaft (23), one end of the connecting shaft (23) is in transmission connection with the piston rod of the hydraulic oil cylinder (215), and the other end of the connecting shaft (23) is in transmission connection with one end of the pressurizing rod (22).
10. The partial pressurizing apparatus for die casting according to any one of claims 1 to 6, wherein the mold frame (11) comprises a movable mold frame (111) and a fixed mold frame (112), the movable mold frame (111) and the fixed mold frame (112) are fixedly connected together, the movable mold (12) is slidably disposed on the movable mold frame (111), and the fixed mold (13) is fixed on the fixed mold frame (112).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423208.0A CN114101623A (en) | 2021-11-26 | 2021-11-26 | Local pressurizing device for die casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423208.0A CN114101623A (en) | 2021-11-26 | 2021-11-26 | Local pressurizing device for die casting |
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| CN114101623A true CN114101623A (en) | 2022-03-01 |
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| CN202111423208.0A Pending CN114101623A (en) | 2021-11-26 | 2021-11-26 | Local pressurizing device for die casting |
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