CN103624237B - A kind of magnesium alloy Anti-gravity casting device and method thereof - Google Patents
A kind of magnesium alloy Anti-gravity casting device and method thereof Download PDFInfo
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Abstract
The invention discloses a kind of magnesium alloy Anti-gravity casting device, this device comprises: lower tank 19 is built-in with melting furnace 2 and crucible 18, and the top of described lower tank 19 adopts seal cover board 16 and external isolation; Between described melting furnace 2 and described seal cover board 16, described lower tank 19 is connected with the first protective gas pipeline 3; The middle and lower part of described lower tank 19 is connected with pressue device 1; Negative-pressure gas guard box 11 is connected with the second protective gas pipeline 8 and negative-pressure pipeline 9.The invention also discloses a kind of this device that utilizes and carry out the method for casting.A kind of magnesium alloy Anti-gravity casting device disclosed in this invention, it can produce large-scale, complicated and thin-wall Mg alloy castings, surface quality of continuous castings and security high; meet production requirement; this device manufacture is simple, and be applicable to magnesium alloy large-scale production, production efficiency is high.
Description
Technical field
The present invention relates to a kind of casting technology field, particularly relate to a kind of magnesium alloy Anti-gravity casting device and method thereof.
Background technology
Magnesium alloy density is low, function admirable, as important structural material, is widely used in the fields such as Aeronautics and Astronautics, national defence, automobile, electronic communication.At present, China's Aeronautics and Astronautics, national defence to the active demand of loss of weight be magnesium alloy new material, the development & application of new technology provides opportunities and challenges.Current, one of principal element of restriction Mg alloy castings extensive use is Mg alloy castings casting difficulty, especially for large-scale, complicated, thin-wall Mg alloy castings, be difficult at present produce the foundry goods satisfied the demands, one of its Key points for foundry is the equipment not having a kind of applicable magnesium alloy cast to produce, because the feature of magnesium alloy own, its casting difficulty is larger, easily there is burning or oxidation in casting process, becomes the large bottleneck that restriction Mg alloy castings is produced.
Die casting is Mg alloy formed technique the most general at present, the Mg alloy castings of more than 90% is all die casting, but die casting can only less, the simple foundry goods of structure of forming dimension, and due to the existence of pore, foundry goods can not heat-treat or weld, and can not compare dark machined.
Shanghai Communications University develops the accurate process for low pressure casting and forming of magnesium alloy large-sized foundry goods, and the two smelting furnace of employing, pressure converter mode ensure the high cleanliness of magnesium liquid; (low-melting alloy Sealing Method, improves dwell pressure to adopt Novel crucible Sealing Technology to seal crucible; Mode such as employing chill, gas cooling etc. reaches the solidification sequence required for foundry goods; Adopt protective gas condensation technique, in dried compressed air, namely add novel R152 protective gas, adopt and be coated with the surface smoothness that layer transfer technology ensures the non-machined surface of foundry goods.But this Technical comparing is complicated, be not easy to operation.
For magnesium alloy plaster precision foundry, No.5 Inst., Ministry of Ordnance Industry's a kind of ceramic gypsum composite mould of invention solves the oxidation of magnesium alloy cavity filling process and combustion problem, in addition be reported in addition in gypsum mould basic powder and add flame retardant, or vacuumize cast, the gypsum mould of drying is taken out, impurity in cleaning die cavity, described vacuum-pumping tube is connected with vavuum pump, and by gate seal, cast is started after being evacuated to vacuum with vavuum pump, the method directly lays blast pipe on casting mold die cavity, but above several research is all carry out relevant improvement to gypsum mould, and technics comparing is complicated, inapplicable industrial production in enormous quantities.
Summary of the invention
(1) technical problem that will solve
Technical problem to be solved by this invention is: provide a kind of magnesium alloy Anti-gravity casting device, with overcome in prior art due to magnesium alloy casting process easily occur burn or oxidation technical problem; And provide a kind of this device that utilizes to carry out the method for casting.
(2) technical scheme
In order to solve the problems of the technologies described above, on the one hand, the invention provides a kind of magnesium alloy Anti-gravity casting device, this device comprises: lower tank 19 is built-in with melting furnace 2 and crucible 18, and the top of described lower tank 19 adopts seal cover board 16 and external isolation; Between described melting furnace 2 and described seal cover board 16, described lower tank 19 is connected with the first protective gas pipeline 3; The middle and lower part of described lower tank 19 is connected with pressue device 1; Described crucible 18 is built-in with stalk 17, has certain distance bottom the lower end of described stalk 17 and described crucible 18, and described stalk 17 forms with magnesium alloy molten surface and is communicated with; Described stalk 17 upper end oral area, through described seal cover board 16, is aimed at the cast gate of the gypsum mould 14 be placed directly on described seal cover board 16; With die cavity 15 in described gypsum mould 14, adopt asbestos 13 to seal above it, described asbestos 13 are stamped asbestos pressing plate 7 above;
Negative-pressure gas guard box 11 is connected with the second protective gas pipeline 8 and negative-pressure pipeline 9; Described negative-pressure gas guard box 11 is placed directly on described gypsum mould 14, and the two ends, bottom of described negative-pressure gas guard box 11 are fixedly connected with described gypsum mould 14, and its junction adopts sealed silicon cushion rubber 5 to seal; Described negative-pressure gas guard box 11 is fixedly connected with described seal cover board 16, and is locked by retaining mechanism 4.
Preferably, be also provided with spring 12 and regulate stud 10 in described negative-pressure gas guard box 11, described asbestos pressing plate 7 is by described spring 12 and regulate stud 10 described asbestos 13 and gypsum mould 14 to be fastenedly connected.
Preferably, described spring 12 and adjustment stud 10 are provided with 4, are evenly distributed.
Preferably, be welded with guide plate (21) with holes in the middle and upper part of described negative-pressure gas guard box (11) inwall, described spring (12) is through described guide plate (21).
Preferably, described stalk 17 all adopts asbestos to seal with described seal cover board 16 contact surface.
Preferably, described first protective gas pipeline 3 is connected with the first protective gas injection device and the second protective gas injection device respectively with the second protective gas pipeline 8; Or described first protective gas pipeline 3 is connected with same protective gas injection device with the second protective gas pipeline 8; this protective gas injection device is controlled by control system; described control system is provided with the first control valve at described first protective gas pipeline 3, is provided with the second control valve at described second protective gas pipeline 8.
Preferably, described negative-pressure gas guard box 11 adopts stud 6 to be connected with described seal cover board 16.
Preferably, described second protective gas pipeline 8 and negative-pressure pipeline 9 are located at top or the sidewall of described negative-pressure gas guard box 11.
Preferably, described protective gas is the mist of 1-10% sulfur hexafluoride and 90-99% argon gas.
On the other hand, present invention also offers and a kind ofly utilize device described above to carry out the method for casting, the method comprises the steps:
Step 1, magnesium alloy is put into melting furnace carry out melting slagging-off at 730 DEG C ~ 820 DEG C, gypsum mould is heated at 200 DEG C ~ 400 DEG C simultaneously;
Step 2, the magnesium alloy liquation after melting slagging-off is put into crucible, and with the lower tank of seal cover board sealing, with the contact surface of stalk described in asbestos seal and described seal cover board, by retaining mechanism, described seal cover board and described lower tank are locked;
Step 3, heating after gypsum mould be placed directly on described seal cover board, the upper end oral area of described stalk aimed at by cast gate, and adopt asbestos to seal described gypsum mould, then negative-pressure gas guard box is placed directly on described gypsum mould, and is fixedly connected with described seal cover board;
Step 4, be that 1-5KPa carries out suppressing for 1 ~ 3 minute to lower tank by the first protective gas pipeline with the mist of 1-10% sulfur hexafluoride and 90-99% argon gas, air pressure;
Step 5, by being positioned at the described top of negative-pressure gas guard box or the negative-pressure pipeline of sidewall vacuumizes described negative-pressure gas guard box, vacuum reaches-20 ~-30KPa; Then immediately the mist of 1-10% sulfur hexafluoride and 90-99% argon gas is injected negative-pressure gas guard box by the second protective gas pipeline, vacuum reaches-10 ~-20KPa; Regulate stud, make adjustment stud alignment springs by guide plate;
Step 6, adopt the air pressure of 10 ~ 80KPa to exert pressure to described magnesium alloy molten surface by pressue device, make described magnesium alloy liquation from bottom to top enter die cavity along described stalk, carry out low-pressure casting.
(3) beneficial effect
A kind of magnesium alloy Anti-gravity casting device provided by the present invention and method tool have the following advantages:
One, by negative-pressure pipeline, negative-pressure gas guard box is vacuumized; then protective gas is injected by the second protective gas passage; protective gas enters in gypsum mould, is discharged by the air in die cavity, prevents magnesium alloy liquation and gypsum mould to react and burn; avoid the defects such as cast(ing) surface oxidation, slag inclusion and cold shut; meanwhile, ensure that gypsum mould die cavity is in negative pressure state, be convenient to liquid magnesium alloy and fill type; be beneficial to complex thin-walled member to be shaped, improve surface quality and the internal organizational structure of foundry goods.Negative-pressure gas guard box structure is independent, easy, convenient operation, can realize thin-wall complicated magnesium alloy member and produce in enormous quantities, be convenient to again manufacture experimently or small lot batch manufacture single-piece large thin-wall magnesium alloy member.
Two, protective gas is injected by the downward tank of the first protective gas pipeline; prevent magnesium alloy liquation from burning; by pressue device, external force is applied to lower tank; pressure in self gravitation, viscous force and die cavity is overcome to make magnesium alloy liquation; magnesium alloy liquation is moved from bottom to top along stalk; realize anti-gravity pouring; ensure that magnesium alloy liquation flows in die cavity with even pace; can prevent foundry goods from producing cold shut phenomenon; can prevent again foundry goods from forming oxide inclusion defects, thus be conducive to the formation of thin-wall part.
Therefore adopt casting device of the present invention, the security of production Mg alloy castings is high, adapts to produce large-scale, complicated and thin-wall Mg alloy castings, cast(ing) surface non-oxidation, slag inclusion, cold shut defects, dense internal organization, functional, meets production requirement; This device manufacture is simple, is easy to promote, and be applicable to magnesium alloy large-scale production, production efficiency is high.
Accompanying drawing explanation
Fig. 1 is the structure chart of a kind of magnesium alloy Anti-gravity casting device of the present invention;
Fig. 2 is negative-pressure gas guard box structure of the present invention and installation diagram;
Fig. 3 is the oxidized design sketch of Mg alloy castings part.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment, the specific embodiment of the present invention is described in further detail.Following examples only for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one:
As shown in Figure 1, the present embodiment describes a kind of magnesium alloy Anti-gravity casting device, and this device comprises: lower tank 19 is built-in with melting furnace 2 and crucible 18, and the top of lower tank 19 adopts seal cover board 16 and external isolation.In order to avoid magnesium alloy liquation and oxygen burn, between melting furnace 2 and seal cover board 16, lower tank 19 is connected with the first protective gas pipeline 3.Like this by the 1-10% sulfur hexafluoride of the first protective gas pipeline 3 injection and the mist of 90-99% argon gas; the sulfur hexafluoride that proportion is larger just can float over above magnesium alloy liquation; react with magnesium alloy liquation; the skin covering of the surface of different protective action is generated at magnesium alloy molten surface; this skin covering of the surface density is large; by magnesium alloy liquation and air insulated, reaction can either be stoped to proceed, also can stop the evaporation of magnesium alloy liquation.Be connected with pressue device 1 in the middle and lower part of lower tank 19, can ensure in course of exerting pressure, the protective gas of magnesium alloy molten surface can be avoided to blow open, prevent the possibility that magnesium alloy liquation burns further.Be built-in with stalk 17 at crucible 18, have certain distance bottom the lower end of stalk 17 and crucible 18, stalk 17 is inner to be formed with magnesium alloy molten surface and is communicated with.When by pressue device 1, tank 19 is exerted pressure downwards, externally applied forces overcomes the pressure in magnesium alloy liquation self gravitation, viscous force and die cavity 15, magnesium alloy liquation is moved from bottom to top along stalk 17, achieves anti-gravity pouring.Anti-gravity pouring process is a controllable technical process, can according to the wall thickness of foundry goods, highly, weight and complexity, adjustment externally applied forces, hydraulic coupling, mold filling pressure, crust boost pressure and crystallization boost pressure is risen for magnesium alloy liquation provides stable, larger resistance is produced to overcome the complex structure of die cavity 15 internal cause foundry goods, ensure that magnesium alloy liquation flows in die cavity 15 with even pace, can prevent foundry goods from producing cold shut phenomenon, can prevent again foundry goods from forming oxide inclusion defects, thus be conducive to the formation of thin-wall part.Stalk 17 upper end oral area, through seal cover board 16, is aimed at the cast gate of gypsum mould 14.Gypsum mould 14 is placed directly on seal cover board 16, and the asbestos 13 that adopt above of gypsum mould 14 seal, and asbestos 13 are stamped asbestos pressing plate 7 above.
The top of negative-pressure gas guard box 11 or sidewall are connected with the second protective gas pipeline 8 and negative-pressure pipeline 9.Negative-pressure gas guard box 11 is placed directly on gypsum mould 14, and two ends, bottom and the gypsum mould 14 of negative-pressure gas guard box 11 are fixed by sunk screw, and its junction adopts sealed silicon cushion rubber 5 to seal, and decreases weight, is convenient to dismounting, reduces cost.Negative-pressure gas guard box 11 is fixedly connected with seal cover board 16 by stud, and is locked by retaining mechanism 4, can improve stability and the sealing of device.
By negative-pressure pipeline 9, be evacuated by negative-pressure gas guard box 11, the gas of gypsum mould 14 inside is pumped by asbestos 13 and asbestos pressing plate 7, closes negative-pressure pipeline 9; Then inject protective gas by the second protective gas pipeline 8 to negative-pressure gas guard box 11, make the air pressure of negative-pressure gas guard box 11 inside increase, but still be in negative pressure state guarantor.Under negative pressure state, protective gas enters in die cavity 15 by asbestos pressing plate 7 and asbestos 13, gypsum mould 14 and magnesium alloy liquation is isolated, prevents magnesium alloy and gypsum mould 14 from reacting, prevent cast(ing) surface oxidized, thus improves the quality of foundry goods.
In order to ensure that protective gas can enter through asbestos 13 smoothly and be filled with gypsum mould 14 inside; air in die cavity 15 is discharged; casting portion is prevented to be oxidized; as shown in Figure 2; therefore in negative-pressure gas guard box 11, be also provided with spring 12 and regulate stud 10; asbestos pressing plate 7 is by spring 12 and regulate stud 10 asbestos 13 and gypsum mould 14 to be fastenedly connected, as shown in Figure 2.By regulating stud 10 and spring 12, the elasticity regulating asbestos pressing plate 7 pairs of gypsum moulds 14 to press, reaches the gas permeability object regulating gypsum mould 14.
In order to ensure in protective gas uniformly penetrating die cavity 15; ensure that the gas of die cavity 15 is stablized; the flowing of magnesium alloy liquation in die cavity 15 is stablized, thus is conducive to controlling magnesium alloy liquation rising hydraulic coupling and rising the technological parameters such as liquid speed in casting process, improve the surface quality of foundry goods.This method can establish 1 or multiple spring 12 and regulate stud 10, preferably 4, and is evenly distributed.
When regulating stud 10, in order to ensure to regulate stud 10 alignment springs 12, making asbestos pressing plate 7 uniform stressed, being thus welded with guide plate 21 with holes in the middle and upper part of negative-pressure gas guard box 11 inwall, described spring 12 is through described guide plate 21.
In above-described embodiment, the top and bottom that stalk 17 contacts with seal cover board 16 all adopt asbestos to seal, and prevent the air of outside from entering, magnesium alloy liquation is burnt.
In above-described embodiment, the first protective gas pipeline 3 is connected with the first protective gas injection device and the second protective gas injection device respectively with the second protective gas pipeline 8; Also can be connected with same protective gas injection device, this protective gas injection device is controlled by control system, and control system is provided with the first control valve at the first protective gas pipeline 3, is provided with the second control valve at the second protective gas pipeline 8.When injecting protective gas in downward tank 19, closing the second control valve, opening the first control valve; Otherwise, when injecting protective gas in negative-pressure gas guard box 11, closing the first control valve, opening the second control valve.
Embodiment two:
The present embodiment describes and a kind ofly utilizes the device described in above-described embodiment to carry out the method for casting, and the method comprises the steps:
Step 1, magnesium alloy is put into melting furnace carry out melting slagging-off at 730 DEG C ~ 820 DEG C, gypsum mould is heated at 200 DEG C ~ 400 DEG C simultaneously.；
Step 2, the magnesium alloy liquation after melting slagging-off is put into crucible, and with the lower tank of seal cover board sealing, with the contact surface of stalk described in asbestos seal and described seal cover board, by retaining mechanism, described seal cover board and described lower tank are locked.
Step 3, heating after gypsum mould be placed directly on described seal cover board; the upper end oral area of described stalk aimed at by cast gate; and adopt asbestos to seal described gypsum mould, then negative-pressure gas guard box is placed directly on described gypsum mould, and is fixedly connected with described seal cover board.
Step 4, be that 1-5KPa carries out suppressing for 1 ~ 3 minute to lower tank by the first protective gas pipeline with the mist of 1-10% sulfur hexafluoride and 90-99% argon gas, air pressure.
Step 5, by being positioned at the described top of negative-pressure gas guard box or the negative-pressure pipeline of sidewall vacuumizes described negative-pressure gas guard box, vacuum reaches-20 ~-30KPa; Then immediately the mist of 1-10% sulfur hexafluoride and 90-99% argon gas is injected negative-pressure gas guard box by the second protective gas pipeline, vacuum reaches-10 ~-20KPa; Regulate stud, make adjustment stud alignment springs by guide plate;
Step 6, adopt the air pressure of 10 ~ 80KPa to exert pressure to described magnesium alloy molten surface by pressue device, make described magnesium alloy liquation from bottom to top enter die cavity along described stalk, carry out low-pressure casting.
Introduce a kind of gypsum mould magnesium alloy complex thin-walled member below in detail, the preparation of average wall thickness 1.5mm:
1, raw material is selected: magnesium alloy is ZM3, gypsum mould composition proportion (mass fraction) is: the silica flour of 15% ~ 20%, the talcum powder of 6% ~ 8%, the αsemiwatergypsum of 60% ~ 85%, the MgS04 of 18% ~ 25%, external adding water and other materials, mixed gases matching is the mist of 5% sulfur hexafluoride and 95% argon gas.
2, after taking raw material in the ratio of step 1, by magnesium alloy smelting, to be cast after slagging-off, alloy melt temperature is 790 DEG C.
3,400 DEG C are preheating to gypsum mould, carry out mould assembling and cover negative-pressure gas guard box.
4, be that 5KPa carries out suppressing for 2 minutes to lower tank 19 with the mist of 5% sulfur hexafluoride and 95% argon gas, air pressure.
5, vacuumize negative-pressure gas guard box 11, vacuum is-30KPa, then squeezes into the mist of 5% sulfur hexafluoride and 95% argon gas, makes negative-pressure gas guard box 11 vacuum reach-20KPa, then carries out pressure pouring according to step 6 technological parameter.
6, casting process parameters is: rise liquid speed 30m/s, rise hydraulic coupling 5KPa, filling velocity 30m/s, mold filling pressure 30KPa, investing time 5s, crust boost pressure 5KPa, crystallization time 150s, crystallization boost pressure 5KPa, resistance coefficient 1.0.
According to a mould 12 gypsum mould magnesium alloy test bars that processing step described above is produced, tensile property is 190Mpa, and percentage elongation is 2%.
Introduce a kind of gypsum mould magnesium alloy complex thin-walled member below more in detail, the preparation of average wall thickness 2.4mm, the complexity of this gypsum mould magnesium alloy is higher, and there is reinforcement outside, and there is boss inside, without allowance, is prepared as follows:
1, raw material is selected: magnesium alloy is ZM5, gypsum mould composition proportion (mass fraction) is: the silica flour of 15% ~ 20%, the talcum powder of 6% ~ 8%, the αsemiwatergypsum of 60% ~ 85%, the MgS04 of 18% ~ 25%, external adding water and other materials, mixed gases matching is the mist of 5% sulfur hexafluoride and 95% argon gas.
2, after taking raw material in the ratio of step 1, by magnesium alloy smelting, to be cast after slagging-off, alloy melt temperature is 820 DEG C.
3,380 DEG C are preheating to gypsum mould, carry out mould assembling and cover tank.
4, be that 3KPa carries out suppressing for 3 minutes to lower tank 19 with the mist of 5% sulfur hexafluoride and 95% argon gas, air pressure.
5, vacuumize negative-pressure gas guard box 11, vacuum is-20KPa, then squeezes into the mist of 5% sulfur hexafluoride and 95% argon gas, makes negative-pressure gas guard box 11 vacuum reach-10KPa, then carries out pressure pouring according to step 6 technological parameter.
6, casting process parameters is: rise liquid speed 45m/s, rise hydraulic coupling 8KPa, filling velocity 50m/s, mold filling pressure 40KPa, investing time 5s, crust boost pressure 8KPa, crystallization time 250s, crystallization boost pressure 5KPa, resistance coefficient 1.5.
According to mould gypsum mould thin-section casting that processing step described above is produced, foundry goods average wall thickness 2.4mm, maximum gauge 480mm, high 600mm, surface smoothness is 3.6.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (9)
1. a magnesium alloy Anti-gravity casting device, is characterized in that, this device comprises:
Lower tank (19) is built-in with melting furnace (2) and crucible (18), and the top of described lower tank (19) adopts seal cover board (16) and external isolation; Between described melting furnace (2) and described seal cover board (16), described lower tank (19) is connected with the first protective gas pipeline (3); The middle and lower part of described lower tank (19) is connected with pressue device (1); Described crucible (18) is built-in with stalk (17), certain distance is arranged at the lower end of described stalk (17) and described crucible (18) bottom, and described stalk (17) forms with magnesium alloy molten surface and is communicated with; Described stalk (17) upper end oral area, through described seal cover board (16), is aimed at the cast gate of the gypsum mould (14) be placed directly on described seal cover board (16); With die cavity (15) in described gypsum mould (14), adopt asbestos (13) to seal above it, described asbestos (13) are stamped asbestos pressing plate (7) above; Described gypsum mould (14) is upper, the top of die cavity (15) offers the through hole being connected to asbestos;
Negative-pressure gas guard box (11) is connected with the second protective gas pipeline (8) and negative-pressure pipeline (9); Described negative-pressure gas guard box (11) is placed directly on described gypsum mould (14), the two ends, bottom of described negative-pressure gas guard box (11) are fixedly connected with described gypsum mould (14), and its junction adopts sealed silicon cushion rubber (5) sealing; Described negative-pressure gas guard box (11) is fixedly connected with described seal cover board (16), and by retaining mechanism (4) locking;
Also be provided with spring (12) in described negative-pressure gas guard box (11) and regulate stud (10), described asbestos pressing plate (7) is by described spring (12) and regulate stud (10) described asbestos (13) and gypsum mould (14) to be fastenedly connected.
2. device according to claim 1, is characterized in that, described spring (12) and adjustment stud (10) are provided with 4, are evenly distributed.
3. device according to claim 2; it is characterized in that; be welded with guide plate (21) with holes in the middle and upper part of described negative-pressure gas guard box (11) inwall, described spring (12) is through described guide plate (21).
4. device according to claim 1, is characterized in that, described stalk (17) and described seal cover board (16) contact surface all adopt asbestos to seal.
5. the device according to any one of Claims 1 to 4, it is characterized in that, described first protective gas pipeline (3) is connected with the first protective gas injection device and the second protective gas injection device respectively with the second protective gas pipeline (8); Or described first protective gas pipeline (3) is connected with same protective gas injection device with the second protective gas pipeline (8); this protective gas injection device is controlled by control system; described control system is provided with the first control valve at described first protective gas pipeline (3), is provided with the second control valve at described second protective gas pipeline (8).
6. device according to claim 1, is characterized in that, described negative-pressure gas guard box (11) and described seal cover board (16) adopt stud (6) to be connected.
7. device according to claim 1, is characterized in that, described second protective gas pipeline (8) and negative-pressure pipeline (9) are located at top or the sidewall of described negative-pressure gas guard box (11).
8. device according to claim 1, is characterized in that, described protective gas is the mist of 1-10% sulfur hexafluoride and 90-99% argon gas.
9. utilize the device described in any one of claim 1-8 to carry out a method of casting, it is characterized in that, the method comprises the steps:
Step 1, magnesium alloy is put into melting furnace carry out melting slagging-off at 730 DEG C ~ 820 DEG C, gypsum mould is heated at 200 DEG C ~ 400 DEG C simultaneously;
Step 2, the magnesium alloy liquation after melting slagging-off is put into crucible, and with the lower tank of seal cover board sealing, with the contact surface of stalk described in asbestos seal and described seal cover board, by retaining mechanism, described seal cover board and described lower tank are locked;
Step 3, heating after gypsum mould be placed directly on described seal cover board, the upper end oral area of described stalk aimed at by cast gate, and adopt asbestos to seal described gypsum mould, then negative-pressure gas guard box is placed directly on described gypsum mould, and is fixedly connected with described seal cover board;
Step 4, be that 1-5KPa carries out suppressing for 1 ~ 3 minute to lower tank by the first protective gas pipeline with the mist of 1-10% sulfur hexafluoride and 90-99% argon gas, air pressure;
Step 5, by being positioned at the described top of negative-pressure gas guard box or the negative-pressure pipeline of sidewall vacuumizes described negative-pressure gas guard box, vacuum reaches-20 ~-30KPa; Then immediately the mist of 1-10% sulfur hexafluoride and 90-99% argon gas is injected negative-pressure gas guard box by the second protective gas pipeline, vacuum reaches-10 ~-20KPa; Regulate stud, make adjustment stud alignment springs by guide plate;
Step 6, adopt the air pressure of 10 ~ 80KPa to exert pressure to described magnesium alloy molten surface by pressue device, make described magnesium alloy liquation from bottom to top enter die cavity along described stalk, carry out low-pressure casting.
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| US3774668A (en) * | 1969-02-28 | 1973-11-27 | Sulzer Ag | Vacuum casting apparatus |
| CN88102623A (en) * | 1987-05-07 | 1988-12-14 | 金属铸造技术公司 | The equipment of countergravity casting of metal with air exclusion and method |
| US5303762A (en) * | 1992-07-17 | 1994-04-19 | Hitchiner Manufacturing Co., Inc. | Countergravity casting apparatus and method |
| US5597032A (en) * | 1993-05-10 | 1997-01-28 | Merrien; Pierre | Controlled method for injection casing using a mold under vacuum, especially intended for aluminium or magnesium alloys and device for carrying out said method |
| CN1239683A (en) * | 1998-06-22 | 1999-12-29 | 中央精机株式会社 | Suction casting method and suction casting apparatus |
| CN201455230U (en) * | 2009-06-26 | 2010-05-12 | 宁波强盛机械模具有限公司 | Core vent for aluminum alloy metal-type low-pressure casting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55136555A (en) * | 1979-04-11 | 1980-10-24 | Hitachi Ltd | Low-pressure casting method |
-
2013
- 2013-12-16 CN CN201310692356.1A patent/CN103624237B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3774668A (en) * | 1969-02-28 | 1973-11-27 | Sulzer Ag | Vacuum casting apparatus |
| CN88102623A (en) * | 1987-05-07 | 1988-12-14 | 金属铸造技术公司 | The equipment of countergravity casting of metal with air exclusion and method |
| US5303762A (en) * | 1992-07-17 | 1994-04-19 | Hitchiner Manufacturing Co., Inc. | Countergravity casting apparatus and method |
| US5597032A (en) * | 1993-05-10 | 1997-01-28 | Merrien; Pierre | Controlled method for injection casing using a mold under vacuum, especially intended for aluminium or magnesium alloys and device for carrying out said method |
| CN1239683A (en) * | 1998-06-22 | 1999-12-29 | 中央精机株式会社 | Suction casting method and suction casting apparatus |
| CN201455230U (en) * | 2009-06-26 | 2010-05-12 | 宁波强盛机械模具有限公司 | Core vent for aluminum alloy metal-type low-pressure casting |
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| CN103624237A (en) | 2014-03-12 |
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