CN2569950Y - Oxidation prevent magnesium alloy low-pressure die-casting machine - Google Patents
Oxidation prevent magnesium alloy low-pressure die-casting machine Download PDFInfo
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- CN2569950Y CN2569950Y CN 02279479 CN02279479U CN2569950Y CN 2569950 Y CN2569950 Y CN 2569950Y CN 02279479 CN02279479 CN 02279479 CN 02279479 U CN02279479 U CN 02279479U CN 2569950 Y CN2569950 Y CN 2569950Y
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Abstract
The utility model discloses an oxidation-proof magnesium alloy low-pressure die-casting machine. A main member is composed of a holding furnace, a crucible, a riser tube, a mold, a low-pressure casting host machine and a pneumatic control system, wherein, the mold comprises a casting mold and a sprue cover. The utility model is characterized in that the outer side of the throat part of the riser tube is provided with a sealing ring of a shielding gas ring, which can be used for sealing a sprue cover and a riser tube opening around the sprue cover and the riser tube opening; the sealing ring of the shielding gas ring is provided with a through tube for inert gas. Therefore, the utility model has the advantages of simple design, convenient operation, low production cost, high productivity and superior safety performance; when molten metal flows back, the gas can be protected to avoid the generation of oxide skins; therefore, the generation of casting oxidation inclusion and the aggregation of the oxide skins of the riser tube can be prevented or reduced; the casting oxidation inclusion is reduced. The utility model can be used for low-pressure casting machines with various model numbers and can also greatly improve the freezing pressure of the low-pressure casting machines; the application ranges of low-pressure casting parts can be widened to make the quality of the low-pressure casting parts greatly improved.
Description
Technical field:
The utility model belongs to a kind of air injection machine, especially belongs to a kind of anti-oxidation magnesium alloy low-pressure casting machine.
Background technology:
Abroad, in early in the twentieth century beginning one's study and using low pressure casting, the same period, the E.H.Lake of Britain registered first low pressure casting patent, be mainly used in the casting of babbit, the Frenchman has formulated the plan that is used for aluminium alloy and copper alloy, and has at first obtained applying in aluminium alloy casting production.After the World War II outburst, Britain extensively adopts the light-alloy part of the higher aero-engine of low pressure casting technology production requirement, and air injection machine is widely used in auto industry, electric machine industry, universal machine, textile machine, instrument and commercial product field subsequently.The production of air injection machine has at present realized specialized production.The design of air injection machine that is used in low-melting-point metal or alloy now is substantially based on a kind of identical principle: the gas that feeds compression in the sealing crucible of alloy liquid is housed, the pressure of gas acts on the alloy liquid level of the cast temperature that keeps certain, under lower mold filling pressure, alloy along the stalk that communicates with casting mold through runner, casting mold cast gate, reposefully be full of die cavity after, increase pressure, make the alloy liquid solidification and crystallization under higher pressure in the die cavity; Gas release in the crucible then, the liquid metal of ot-yet-hardened falls back in the crucible under the effect of gravity in the stalk.Carry out next one circulation after taking out foundry goods.
The low pressure casting of magnesium alloy is not both very easily oxidation of magnesium alloy, burning even blast with the maximum of the low pressure casting of other alloy.Therefore the low pressure casting of magnesium alloy must meet the characteristics of magnesium alloy, especially prevents the oxidation, burning of magnesium alloy, will prevent that magnesium alloy from blasting especially.
Conventional low pressure casting, the method that the crucible sealing is exerted pressure has following shortcoming: the interpolation of molten metal, the sealing of crucible and unlatching and cleaning operation quite bother, consuming time; " tripe rises " phenomenon can take place through exerting pressure repeatedly in crucible, and this phenomenon reduces the service life of crucible greatly; For resembling the such combustible metal of magnesium alloy, " tripe rises " may cause serious leakage magnesium security incident, and liquid magnesium alloy leaks as the stove inner chamber in the crucible, can cause heavy explosion usually.For preventing the generation of this type of major accident, exerting pressure simultaneously in the crucible outside of being everlasting, so that the crucible external and internal pressure is equal, prevents that crucible from breaking, and will make die casting machine become complicated more like this, and the control of pressure and adjusting also become very difficult; Because the capacity of crucible is generally bigger, consumption gas is more during pressurization, makes that air feed equipment increases, the air feed cost increases; If foundry goods requires higher freezing pressure, the crucible of the big volume of high temperature is difficult to realize, otherwise safety problem becomes very serious.Be mingled with because magnesium alloy generates easily, therefore do not carry out refining, insulation usually simultaneously in same crucible, the dismounting of frequent crucible cover makes operation very complicated.The oxidation that liquid magnesium alloy falls to causing in stalk during release is carried out repeatedly, can generate a large amount of oxide skin in stalk, influences the carrying out that produces, and also may cause the oxide inclusion of foundry goods.This shows that present existing air injection machine can not be applicable to the low pressure casting of magnesium alloy well.
Summary of the invention:
The purpose of this utility model provides a kind of air injection machine that can prevent the liquid magnesium alloy oxidation of falling when the stalk release.The purpose of this utility model is to realize like this; described anti-oxidation magnesium alloy low-pressure casting machine; main member is made of holding furnace, crucible, stalk, mould and low pressure casting main frame and pneumatic control system; mould comprises casting mold and sprue bush; its design feature can center on sprue bush and stalk mouth and can seal up sprue bush and the protection compression ring sealing ring of stalk mouth for the throat's arranged outside at stalk has, this protection compression ring sealing ring is provided with the inert gas access tube.The purpose of this utility model also can be achieved through the following technical solutions; described anti-oxidation magnesium alloy low-pressure casting machine, its characteristics are located between casting mold bottom surface and the low pressure casting main frame flat board for protection compression ring sealing ring and ring-type surrounds and can seal up sprue bush and stalk mouth.Described anti-oxidation magnesium alloy low-pressure casting machine, its characteristics adopt high-temperature resistant seal ring to make for protection compression ring sealing ring.The utility model can center on sprue bush and stalk mouth and can seal up sprue bush and the protection compression ring sealing ring of stalk mouth owing to the throat's arranged outside at stalk has, this protection compression ring sealing ring is provided with the inert gas access tube.Thereby have simplicity of design, easy to operate, producing cost is low, productivity ratio is high, security performance is good, when being refluxed, molten metal obtains the protection of gas, avoid the generation of oxide skin, thereby prevent or reduce the generation and the gathering of stalk oxide skin of foundry goods oxide inclusion, greatly reduce the foundry goods oxide inclusion; The air injection machine that can be used for various models can also significantly improve the freezing pressure of air injection machine, improves the scope of application of low pressure casting to part, and the quality of low pressure casting part is increased substantially.The utility model carries out multiple magnesium alloy low-pressure casting part experiment, and operations is functional, index up to specification.Magnesium alloy low-pressure casting machine performance of the present utility model will obviously surpass other design.The utility model also is used for the low pressure casting of aluminium alloy.
Description of drawings:
Fig. 1 is a pulsometer structural representation of the present utility model.
Fig. 2 is a structural representation of protecting compression ring in throat's arranged outside of stalk of the present utility model.
Fig. 3 is a structural representation of the present utility model.
Fig. 4 puts in the interior structural representation of bayonet socket that low pressure casting main frame flat board is provided with for stalk front end of the present utility model.
Fig. 5 hangs over structural representation on the bayonet socket that low pressure casting main frame flat board is provided with for stalk front end of the present utility model.
The specific embodiment:
Below in conjunction with accompanying drawing the utility model is elaborated:
As Fig. 1, Fig. 2, shown in Figure 3, novel air injection machine of the present utility model mainly is made of holding furnace 20, crucible 19, stalk 5, wheel 7, elevating mechanism 8 and low pressure casting main frame, design feature replaces exerting pressure in traditional sealed crucible for adopting the pulsometer be dipped in the normal pressure liquid magnesium alloy to exert pressure, pulsometer drive molten metal along stalk 5 to casting mold filling, supercharging, pressurize; Second, stalk is fixed on the pulsometer and is deep into the top, bottom of pulsometer inner chamber, pulsometer is provided with normal opening one-way valve, when stalk is dipped in molten metal, molten metal enters pulsometer automatically, pulsometer inner chamber top has pipeline to link to each other with pneumatic control system, during inflation, gas pressure acts on liquid level on the inner chamber of pulsometer, and normal opening one-way valve cuts out, molten metal along stalk to casting mold filling, supercharging, pressurize, after release, the not solidifying liq in the stalk falls, and normal opening one-way valve is opened, molten metal in the crucible enters pulsometer, for next one circulation is prepared.The 3rd, according to the size of alloy species, foundry goods, to the requirement of mold filling pressure, the replaceable different material of pulsometer, different volumes, different thickness of shell.The 4th, pulsometer and stalk are welded into one, and also can connect with knock-down form with multi-form.Pulsometer is connected with the low pressure casting main frame with the mode that the conjuncted usefulness of stalk hangs tag and dismantles, thereby realizes the very easy overall separation that makes crucible furnace with the low pressure casting main frame, makes operation greatly simplify and connects reliably.The 5th, make the liquid magnesium alloy in the stalk oxidized for preventing release, at throat's arranged outside protection compression ring of stalk, the inert gas of this protection compression ring is sucked by the negative pressure in the stalk when the pump release, thereby prevents the oxidation of liquid magnesium alloy effectively.In the air injection machine production process, liquid metal filling, supercharging and pressurize are done driving force by pulsometer independently, and crucible is in atmospheric pressure state in casting process.Because pulsometer can manufacture withstand voltage higher, to adapt to the magnesium alloy needs reach the tendency that reduces foundry goods shrinkage porosite, hot tearing by raising liquid metal filling, supercharging and dwell pressure requirement, the novel magnesium alloy air injection machine of the utility model design, maximum working pressure (MWP) can reach 0.3～0.8MPa, and general air injection machine is difficult to reach level like this.The structure of pulsometer comprises pump case 1, one-way cock and air inlet pipe 4 as shown in Figure 1, and one-way cock comprises check valve float 2, valve seat 6 and spacing 3, check valve float 2 be designed to normally open and under spacing 3 effect not away from valve seat 6; Pump case 1 inner chamber top has air inlet pipe 4 to link to each other with pneumatic control system.When gas did not enter, molten metal made check valve float 2 float from valve seat under the static pressure effect, and under spacing 3 effect not away from valve seat 6, molten metal just enters pump case 1 inner chamber.When beginning to fill type, gas enters pump chamber with pressure and the flow of adjusting from air inlet pipe, check valve float 2 causes the one-way cock closure with valve seat 6 contacts under the effect of fluid, this moment, the molten metal of pressurized entered stalk 5, filled type, supercharging and pressurize according to what molten metal was finished in the variation of air pressure subsequently.After pressurize finished, pump case 1 intracavity gas was released, under the effect of the static pressure of molten metal, and check valve float 2 come-ups, one-way cock is opened, and not solidified metal falls back in the pump chamber in the stalk.Treat behind the certain hour interval, to carry out next one circulation.Pulsometer and stalk welding join together, and stalk also can be made segmented, so that different situations adopt respectively.As shown in Figure 3, the formula structure that hangs tag is adopted in the installation of pulsometer and low pressure casting main frame flat board, and this structure can make installation very reliable and easy, makes it to meet the manufacturing technique requirent of magnesium alloy low-pressure casting, both required reliably, requirement can be satisfied the requirement of frequent dismounting, cleaning again; Stalk cover having heaters 12 below low pressure casting main frame flat board 10.The flange 9 that wheel 7 that is provided with by mobile holding furnace 20 bottoms and elevating mechanism 8 make the stalk front end puts in the bayonet socket 11 that low pressure casting main frame flat board 10 is provided with, see shown in Figure 4, when stalk front end flange 9 puts in the bayonet socket 11 on the low pressure casting main frame flat board, the flange 9 that wheel 7 that is provided with bottom mobile holding furnace and elevating mechanism 8 make stalk hangs on the bayonet socket 11 of low pressure casting main frame flat board, sees shown in Figure 5.Stalk adopts the stalk of two-period form, the flange 9 of stalk upper end by refractory seals pad 13 and low pressure casting main frame flat board 10 closely cooperate see shown in Figure 2.As shown in Figure 2, the throat at stalk adopts the molten metal backflow to fall to inflating anti-oxidation technology.Promptly when release, throat at stalk will have the top that the gas that prevents the liquid magnesium alloy oxidative function sucks the whereabouts liquid magnesium alloy of stalk by particular design, when being refluxed, molten metal obtains the protection of gas, avoid the generation of oxide skin, thereby prevent or reduce the generation and the gathering of stalk oxide skin of foundry goods oxide inclusion; Concrete structure can center on sprue bush 14 and stalk mouth 15 and can seal up sprue bush and the protection compression ring sealing ring 16 of stalk mouth for the throat's arranged outside at stalk 5 has; this protection compression ring sealing ring 16 is provided with inert gas access tube 17; protection compression ring sealing ring 16 is located between casting mold 18 bottom surfaces and the low pressure casting main frame flat board 10 and ring-type surrounds and can seal up sprue bush and stalk mouth 15, and protection compression ring sealing ring adopts high-temperature resistant seal ring to make.The inert gas of this protection compression ring is sucked by the negative pressure in the stalk when the pump release, thereby prevents the oxidation of liquid magnesium alloy effectively.
Example one of the present utility model:
Magnesium alloy medium size (wheel hub) part air injection machine, pulsometer employing wall thickness is the jessop welding more than 8 millimeters, volume is about 10 liters, the top of pump is that jessop links to each other with argon gas source more than 20 millimeters with internal diameter, the check valve float 2 of check valve (has pore for ducted body, prevent from that when gases are heated, they expand in the ducted body and can't release to set off an explosion), apparent specific volume is 1.2 gram/cubic centimetres, the valve plug of check valve also can be designed to the entity light weight, opens by the static pressure of liquid magnesium alloy.Pulsometer and stalk can be mentioned together with one of mold base plate with the core-pulling mechanism of air injection machine, and production shows that the production process that makes magnesium alloy low pressure make wheel hub is simplified, and the wheel hub metallurgical quality significantly improves.
Example two:
Magnesium alloy smallclothes air injection machine, the air injection machine commonly used of die casting body and two die sinkings (do not have mechanical core-pulling mechanism, form core cavity with husky core usually) is identical, and pulsometer and stalk can be with manually mentioning to clear up operations such as pump, stalk and crucible.
Example three:
The utility model also is used for the low pressure casting of aluminium alloy, and above-mentioned advantage is shown equally.
Claims (3)
1, a kind of anti-oxidation magnesium alloy low-pressure casting machine; main member is made of holding furnace (20), crucible (19), stalk (5), mould and low pressure casting main frame and pneumatic control system; mould comprises casting mold (18) and sprue bush (14); it is characterized in that throat's arranged outside at stalk (5) has can center on sprue bush (14) and stalk mouth (15) and can seal up sprue bush and the protection compression ring sealing ring (16) of stalk mouth, and this protection compression ring sealing ring (16) is provided with inert gas access tube (17).
2, anti-oxidation magnesium alloy low-pressure casting machine according to claim 1 is characterized in that protecting compression ring sealing ring (16) to be located between casting mold (18) bottom surface and the low pressure casting main frame flat board (10) and ring-type surrounds and can seal up sprue bush (14) and stalk mouth (15).
3, anti-oxidation magnesium alloy low-pressure casting machine according to claim 1 and 2 is characterized in that protecting the compression ring sealing ring to adopt high-temperature resistant seal ring to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02279479 CN2569950Y (en) | 2002-09-30 | 2002-09-30 | Oxidation prevent magnesium alloy low-pressure die-casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02279479 CN2569950Y (en) | 2002-09-30 | 2002-09-30 | Oxidation prevent magnesium alloy low-pressure die-casting machine |
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| Publication Number | Publication Date |
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| CN2569950Y true CN2569950Y (en) | 2003-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 02279479 Expired - Fee Related CN2569950Y (en) | 2002-09-30 | 2002-09-30 | Oxidation prevent magnesium alloy low-pressure die-casting machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101652208B (en) * | 2007-04-09 | 2011-11-02 | 新东工业株式会社 | Low-pressure casting apparatus and method of filling inert gas |
| CN102962433A (en) * | 2012-12-06 | 2013-03-13 | 淄博宏泰防腐有限公司 | Magnesium alloy low-pressure casting equipment |
| CN105921718A (en) * | 2016-06-13 | 2016-09-07 | 南通爱尔思轻合金精密成型有限公司 | Sealing device for metal mold low-pressure cast lift tube |
| CN112570684A (en) * | 2019-09-30 | 2021-03-30 | 沈阳铸造研究所有限公司 | Integral extrusion casting device for aluminum alloy wheel and extrusion casting process and application thereof |
| CN114505464A (en) * | 2022-03-14 | 2022-05-17 | 开平市奇迪科压铸卫浴有限公司 | Environment-friendly zinc alloy handle low-pressure casting process |
-
2002
- 2002-09-30 CN CN 02279479 patent/CN2569950Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101652208B (en) * | 2007-04-09 | 2011-11-02 | 新东工业株式会社 | Low-pressure casting apparatus and method of filling inert gas |
| CN102962433A (en) * | 2012-12-06 | 2013-03-13 | 淄博宏泰防腐有限公司 | Magnesium alloy low-pressure casting equipment |
| CN105921718A (en) * | 2016-06-13 | 2016-09-07 | 南通爱尔思轻合金精密成型有限公司 | Sealing device for metal mold low-pressure cast lift tube |
| CN112570684A (en) * | 2019-09-30 | 2021-03-30 | 沈阳铸造研究所有限公司 | Integral extrusion casting device for aluminum alloy wheel and extrusion casting process and application thereof |
| CN114505464A (en) * | 2022-03-14 | 2022-05-17 | 开平市奇迪科压铸卫浴有限公司 | Environment-friendly zinc alloy handle low-pressure casting process |
| CN114505464B (en) * | 2022-03-14 | 2023-11-24 | 开平市奇迪科压铸卫浴有限公司 | Low-pressure casting process of environment-friendly zinc alloy handle |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |