CN205732823U - A kind of low pressure loses the close casting system of cerotin - Google Patents

Abstract

The utility model discloses a kind of low pressure and lose the close casting system of cerotin, including the holding furnace being positioned in air injection machine, holding furnace is inserted with stalk, stalk top stretch out holding furnace and be positioned at low pressure casting machine worktable centre bore in, low pressure casting machine worktable is fixedly arranged above lifting steel plate, lifting steel plate is fixedly arranged above moulding steel plate, moulding steel plate is fixedly arranged above sandbox, sandbox top is coated with compression steel plate, compress and be pressed with hold down gag above steel plate, the lumen centers of sandbox is provided with combination shell, combination shell and stalk coaxial line；Combination shell includes the most through thin-wall product shell, ingate shell, cross gate shell and cup shell, and the lower port of cup shell is positioned in the centre bore of moulding steel plate and seals with the upper port of stalk docks；The periphery of combination shell and the inner space of thin-wall product shell are filled with dry sand.Thin-wall product can be at high temperature shaped by this system, low cost, and efficiency is high, and defect is few.

Description

A kind of low pressure loses the close casting system of cerotin

Technical field

This utility model relates to a kind of casting system, loses the close casting system of cerotin particularly to a kind of low pressure, belongs to metal Casting technology field.

Background technology

Model casting is also known as lost-wax casting, and the production process of lost-wax casting is to coat several layers of refractory material at wax pattern surface, After its dry through, molten the going of wax-pattern therein is made shell, then shapes through roasting, then pour into a mould, after cooling Obtain foundry goods.Foundry goods owing to obtaining has higher dimensional accuracy and surface smoothness, therefore also known as precision-investment casting.

Low pressure casting is to make liquid metal filling die cavity under pressure, to form a kind of method of foundry goods.Low die casting The technical process made is as follows: being passed through dry compressed air in airtight holding furnace, the molten metal in holding furnace is in gas pressure Rise along stalk under power, enter die cavity by cast gate, keep the pressure of insulation furnace gas until the molten metal in die cavity is complete Full solidification forms foundry goods.Then release insulation furnace pressure, make not solidified molten metal in stalk flow back to holding furnace, then release Casting mold top hold down gag pressure, takes out foundry goods.

Fired mold precision casting type shell is generally manually to pour into a mould under gravity state, but, wall complicated for structure The bigger foundry goods of thick great disparity pours into a mould under gravity state that the product often internal flaw obtained is more, and mechanical property is the most up to standard, And solve the effective method of this problem and exactly precision investment casting mould case is placed on low-pressure die casting plant under low voltage situations Cast.Because liquid metal filling is steady during low pressure casting, can reduce the defects such as oxide slag inclusion, foundry goods solidifies under stress, so Dense structure's mechanical property is high.

When using the method casting fine casting shell of low pressure casting, first have to solve the interface between shell and air injection machine Problem, realizing this technique at present mainly has a following two mode:

1, make special tooling, frock is directly born against on shell, mechanically fasten.The method limitation Relatively big, different foundry goods is needed to make different frocks, needs to expend substantial amounts of cost；Fastening between frock and shell The bad grasp of power, the least meeting of fastening force causes shell leakage, causes foundry goods to scrap or even to the personal safety of operator and set Standby safety damages, and fastening force then can damage shell too greatly.

2, with phenolic sand molding, shell is placed in sandbox and then with resin sand, shell is coated with completely, then will make Sandbox is placed in low-pressure casting machine work platforms and pours into a mould, and the method is similar to the low pressure casting of sand mold, relative to making frock Method security is the most a lot.But the method has a disadvantage in that the shell of the most generally investment pattern precision casting is at shell Pouring into a mould under the state itself having higher temperature, thus can ensure that thin-wall shell fills type.And if using resin sand by type Shell cladding carries out low-pressure casting, and shell is necessary for being that room ambient conditions just can be carried out, and so, investment pattern precision casting can be forming thin-walled The advantage of part is just obliterated.(2) this technique needs to consume substantial amounts of resin sand, and resin sand price costly, adds and produces into This.(3) resin sand solidification needs the longer time, affects production efficiency.(4) resin can be heated by aluminium alloy through resin sand, Producing a large amount of gas, gas is understood some and is had little time to discharge and enter foundry goods after entering die cavity, cause being formed gas in foundry goods Hole defect.(5) near cast gate, resin sand easily makes resin depleted through long baking thus causes molding sand defeated and dispersed, bursts Molding sand after Saning can enter low-pressure casting thermal insulation furnace through stalk, and during cast, in stove, molding sand can enter and pours into a mould behind again Cast-internal, produces the defects such as sand holes in foundry goods.

Utility model content

The purpose of this utility model is, overcomes problems of the prior art, it is provided that a kind of low pressure loses the close casting of cerotin Manufacturing system, can at high temperature be shaped thin-wall product, it is not necessary to use resin sand, reduces the defect such as pore, sand holes, produces into This is low, and production efficiency is high.

For solving above technical problem, a kind of low pressure of the present utility model loses the close casting system of cerotin, including being positioned at low pressure Holding furnace in casting machine, the liquid Space of described holding furnace is inserted with stalk, and the gas-phase space sidewall of described holding furnace passes through Intake valve is connected with compressed air hose, and the top of described stalk is stretched out described holding furnace and is positioned at the work of described air injection machine In station centre bore, the workbench of described air injection machine is fixedly arranged above lifting steel plate, described lifting steel plate fixed above Have moulding steel plate, described moulding steel plate be fixedly arranged above sandbox, the top of described sandbox is coated with compression steel plate, described compression Being pressed with hold down gag above steel plate, the lumen centers of described sandbox is provided with combination shell, described combination shell and described stalk Coaxial line；Described combination shell include the most through thin-wall product shell, ingate shell, cross gate shell and Cup shell, the lower end of described cup shell is positioned in the centre bore of described moulding steel plate and seals between the two, described The lower port of cup shell seals with the upper port of described stalk and docks；The periphery of described combination shell and described thin-walled produce The inner space of product shell is filled with dry sand.

Relative to prior art, this utility model achieves following beneficial effect: (1) add moulding steel plate, can first by Moulding steel plate is placed on smooth ground, by combination shell be placed in the centre bore of moulding steel plate and cup shell down； Owing to the centre bore of moulding steel plate is smaller, it is simple to realize the sealing between cup shell with fixing, by handling moulding Sandbox and combination shell can be transferred to lift on steel plate by steel plate easily.(2) carry sandbox with moulding steel plate, can adopt It is filled with dry sand, it is to avoid use expensive resin sand, considerably reduce production cost；Dry sand is easy to after casting complete Topple over, and resin sand intensity is the highest needs mechanical vibration to clear up；And dry sand is while protection combination shell, will not produce Gas, it is to avoid resin sand produces gas and invades foundry goods and form gas hole defect after being heated.If not using moulding steel plate and directly using Phenolic sand molding can cause with the stalk mouth of pipe near resin sand because of high temperature combustion decomposition, after efficiency lost resin sand become pine Bulk state, casting complete hangs away sandbox, and loose sand can enter in holding furnace from stalk because not having the carrying of steel plate, When pouring into a mould next product, sand can enter product and cause defect.(3) sandbox is subject to by the pressure of hold down gag, combination shell The pressure of dry sand, stalk rises with holding furnace and produces lift, close between cup shell lower port and stalk upper port Sealing is compacted, it is ensured that sealing effectiveness.(4) it is passed through compressed gas to the gas-phase space of holding furnace, the molten metal edge bottom holding furnace Stalk rises, and enters in the die cavity of combination shell from the lower port of cup shell, and the most successively by cast gate cup type The die cavity of shell, cross gate shell, ingate shell and thin-wall product shell is full of, and then the molten metal in thin-wall product die cavity exists Under Pressure Solidification；Then the gas-phase space of holding furnace is exitted, make the gauge pressure in holding furnace be rapidly reduced to 0MPa, rise liquid The non-frozen metal liquid stream of pipe and top thereof returns in holding furnace；Then remove hold down gag and compress steel plate, lifting steel plate is connected Carry out knockout with moulding steel plate thereon and sandbox Integral lifting to knockout region, cut redundance after knockout and i.e. obtain thin-walled Product.(5) carrying out precision-investment casting for baroque thin-wall product, this utility model is by moulding steel plate and lifting steel The combination of plate achieves the lower port of cup shell and docks with the sealing of the upper port of stalk, thus is not changing stalk Achieving low pressure casting in the case of top dead-centre height, compared with gravity-assist pouring, decrease the defects such as oxide slag inclusion, foundry goods is in pressure Under power, solidification makes dense structure's mechanical property high.(6) this utility model is when carrying out low-pressure casting, and combination shell itself has Higher high temperature, dry sand to combination shell play insulation effect, beneficially thin-wall product fill type；And traditional low-pressure casting exists Pour into a mould under room temperature, affect the molding of thin-wall part.

As improvement of the present utility model, described cup shell is up-small and down-big horn mouth, described cup shell Upper port be connected with the center of cross gate shell and be mutually communicated, each termination of described cross gate shell is the most symmetrical Extending, above each termination of described cross gate shell, lower port with described ingate shell is connected and is mutually communicated, respectively respectively The upper port of described ingate shell lower surface with described thin-wall product shell respectively is connected and is mutually communicated.Molten metal is from liter Liquid pipe rises and initially enters the die cavity of cup, is upwardly into the center of cross gate die cavity from cup die cavity, more horizontal waters along each Road horizontal symmetry flows out, and is upwardly into thin-wall product die cavity from each ingate, it is ensured that thin-wall product is equal in whole circumferential direction Type is filled in even and synchronization.

As in further improvement of the utility model, the lower, outer perimeter of described cup shell and described moulding steel plate Being filled with asbestos cord between central hole inwall, the upper periphery of described cup shell is coated with asbestos pad, outside described asbestos pad Being coated with muff week, described muff is surrounded by symmetrical two halves and is spliced.Asbestos cord achieves cup shell Sealing between bottom and moulding steel plate centre bore and location, prevent dry sand from spilling from gap between the two, and asbestos cord Heat conductivity low, play the effect of insulation；Cup shell top arranges asbestos pad and muff can stop cast gate cup type The heat of shell scatters and disappears, it is to avoid the molten metal solidification in cup, it is ensured that after the foundry goods molding in thin-wall product die cavity, in cup Molten metal can flow back to holding furnace, to save the consumption of molten metal.

As further improvement of the utility model, described muff be covered over clay-bonded sand, described clay-bonded sand Top is filled in the lower section of described cross gate shell, and the underfill of described clay-bonded sand is above described moulding steel plate, described The periphery of clay-bonded sand is filled with described dry sand.The adhesive property of clay-bonded sand is good, and intensity is high, can improve stablizing of combination shell Property, dry sand and asbestos cord are separated, it is ensured that dry sand will not leak into holding furnace from the gap of moulding steel plate centre bore, pollute metal Liquid.

As further improvement of the utility model, the runner internal diameter of described stalk is more than under described cup shell Port inner diameter, the top of described stalk is provided with discoid stalk flange, and described stalk flange is positioned at described low die casting Make in the table core hole of machine；Being provided with flange collar protruding upward in the middle part of the end face of described stalk flange, described flange collar is positioned at In the centre bore of described lifting steel plate, the inner circumferential of described flange collar forms step in flange, and the periphery of described flange collar is formed outside flange Step, in described flange, step is higher than described flange outer step, in described flange the lower surface of step and described moulding steel plate it Between be provided with interior sealing gasket, be provided with external seal pad between the lower surface of described flange outer step and described lifting steel plate.Interior sealing gasket Achieving the sealing between step and moulding steel plate in flange, external seal pad achieves between flange outer step and lifting steel plate Seal, thoroughly stopped the leakage of molten metal by inside and outside two seals.Simultaneously because be additionally arranged moulding steel plate, stalk upper extremely Point position is identical with during other sand casting products of cast, it is not necessary to regulation stalk height back and forth, reduces human operational error Or mechanical action causes the increasing molten metal risk of leakage that mechanical breakdown is caused frequently, it is to avoid occur because molten metal leakage is led Cause great person equipment breakdown.

As further improvement of the utility model, the lower surface of described lifting steel plate connects four lifting steel plate location Post, the lower end of each described lifting steel plate locating dowel is inserted in the locating slot of described low pressure casting machine worktable respectively；Described moulding The lower surface of steel plate connect have four moulding steel plate alignment pins, the lower end of each described moulding steel plate alignment pin insert respectively described in hang In the hole, location of cartridge plate.Moulding steel plate alignment pin can realize being accurately positioned between moulding steel plate and lifting steel plate, lifting Steel plate locating dowel can realize lifting being accurately positioned between steel plate and low pressure casting machine worktable, it can be ensured that air injection machine Coaxial line between workbench, stalk and combination shell, and calibrate efficient and convenient during lifting.

As further improvement of the utility model, the upper portion side wall of described thin-wall product shell is uniformly provided with ventilative micro- Hole.Molten metal along die cavity be gradually increasing time, the gas above die cavity can enter in dry sand by breathable microporous, in preventing die cavity Generation is felt suffocated and is caused foundry goods the defect such as pore and misrun occur.

As further improvement of the utility model, the end face outer rim of described lifting steel plate is arranged with lifting steel plate and hangs Ring, the end face outer rim of described moulding steel plate is arranged with moulding steel plate suspension ring.Can smoothly be lifted by crane by moulding steel plate suspension ring Moulding steel plate, can smoothly play lifting steel plate by lifting steel plate suspension ring.

Accompanying drawing explanation

Being described in further detail this utility model with detailed description of the invention below in conjunction with the accompanying drawings, accompanying drawing only provides ginseng Examine and use is described, being not used to limit this utility model.

Fig. 1 is the structural representation that this utility model low pressure loses the close casting system of cerotin.

Fig. 2 is the enlarged drawing of aminoacyl site in Fig. 1.

Fig. 3 is the structural representation of combination shell.

Fig. 4 is the axonometric chart before muff surrounds.

Fig. 5 is the axonometric chart after muff surrounds.

Fig. 6 is the front view of stalk.

Fig. 7 is the installation diagram at stalk flange position.

Fig. 8 is the front view of cup wax-pattern and cross gate wax-pattern.

Fig. 9 is the top view of Fig. 8.

Figure 10 is the sectional view in Fig. 8 along B-B.

Figure 11 is the schematic diagram covering cross gate plug in Figure 10.

Figure 12 is the three-dimensional exploded view of cup wax-pattern and cross gate wax-pattern.

Figure 13 is the product after this utility model casting processing.

In figure: 1. air injection machine；1a. low pressure casting machine worktable；2. holding furnace；V1. intake valve；3. stalk；3a. Stalk flange；3b. flange collar；Interior sealing gasket；5. external seal pad；6. lifting steel plate；6a. lifts steel plate locating dowel；6b. lifts Steel plate suspension ring；7. moulding steel plate；7a. moulding steel plate alignment pin；7b. moulding steel plate suspension ring；8. combination shell；8a. thin-wall product Shell；8b. ingate shell；8c. cross gate shell；8d. cup shell；8e. breathable microporous；9. sandbox；9a. clay-bonded sand； 9b. dry sand；10. compress steel plate；11. asbestos cords；12. asbestos pads；13. muffs；13a. locks ear；14. cup wax-patterns；15. Cross gate wax-pattern；15a. cross gate plug；16. thin-wall products.

Detailed description of the invention

As shown in Figure 1 to Figure 3, the low pressure of the present utility model mistake close casting system of cerotin includes being positioned in air injection machine 1 Holding furnace 2, the liquid Space of holding furnace 2 is inserted with stalk 3, the gas-phase space sidewall of holding furnace 2 pass through intake valve V1 and pressure Contracting air hose connect, the top of stalk 3 stretch out holding furnace 2 and be positioned at low pressure casting machine worktable 1a centre bore in, low pressure The workbench of casting machine is fixedly arranged above lifting steel plate 6, and lift steel plate 6 is fixedly arranged above moulding steel plate 7, moulding steel plate 7 Being fixedly arranged above sandbox 9, the top of sandbox 9 is coated with compression steel plate 10, compresses and is pressed with hold down gag, sandbox 9 above steel plate 10 Lumen centers be provided with combination shell 8, combination shell 8 and stalk 3 coaxial line；Combination shell 8 includes passing through the most successively Logical thin-wall product shell 8a, ingate shell 8b, cross gate shell 8c and cup shell 8d, the lower end of cup shell 8d Being positioned in the centre bore of moulding steel plate 7 and seal between the two, the lower port of cup shell 8d is close with the upper port of stalk 3 Envelope docking；The periphery of combination shell 8 and the inner space of thin-wall product shell 8a are filled with dry sand 9b.

Cup shell 8d is up-small and down-big horn mouth, in the upper port of cup shell 8d and cross gate shell 8c The heart is connected and is mutually communicated, and each termination of cross gate shell 8c is horizontally outward symmetrically extended, each termination of cross gate shell 8c Top lower port with ingate shell 8b respectively is connected and is mutually communicated, the upper port of each ingate shell 8b respectively with thin-walled The lower surface of product shell 8a connects and is mutually communicated.

It is filled with asbestos cord 11 between lower, outer perimeter and the center bore inner wall of moulding steel plate 7 of cup shell 8d.Cast gate The upper periphery of cup type shell 8d is coated with asbestos pad 12, and the periphery of asbestos pad 12 is coated with muff 13.

As shown in Figure 4, Figure 5, muff 13 is surrounded by symmetrical two halves and is spliced, and is wrapped in by asbestos pad 12 and waters Behind the periphery of cup shell 8d, muff 13 being stuck in the outside of asbestos pad 12 in opposite directions, bolt is through locking ear 13a by the Kazakhstan of both sides Husband couples together.

Muff 13 be covered over clay-bonded sand 9a, the top of clay-bonded sand 9a is filled in the lower section of cross gate shell 8c, The underfill of clay-bonded sand 9a is above moulding steel plate 7, and the periphery of clay-bonded sand 9a is filled with dry sand 9b.

As shown in Figure 6, Figure 7, the runner internal diameter of the stalk 3 lower port internal diameter more than cup shell 8d, stalk 3 Top is provided with discoid stalk flange 3a, and stalk flange 3a is positioned in the table core hole of air injection machine；Rise liquid Being provided with flange collar 3b protruding upward in the middle part of the end face of pipe flange 3a, flange collar 3b is positioned in the centre bore of lifting steel plate 6, flange collar 3b Inner circumferential forms step in flange, and the periphery of flange collar 3b forms flange outer step, and in flange, step is higher than flange outer step, in flange It is provided with interior sealing gasket 4 between the lower surface of step and moulding steel plate 7, sets between the lower surface of flange outer step and lifting steel plate 6 There is external seal pad 5.Interior sealing gasket 4 achieves the sealing in flange between step and moulding steel plate 7, and external seal pad 5 achieves method Sealing between blue outer step and lifting steel plate 6, thoroughly stops the leakage of molten metal by inside and outside two seals.

The lower surface of lifting steel plate 6 connects four lifting steel plate locating dowels 6a, each lower end lifting steel plate locating dowel 6a Insert respectively in the locating slot of low pressure casting machine worktable 1a；The lower surface of moulding steel plate 7 connects four moulding steel plate location Pin 7a, the lower end of each moulding steel plate alignment pin 7a is inserted in the hole, location of lifting steel plate 6 respectively.Steel plate alignment pin 7a is permissible in moulding Realizing being accurately positioned between moulding steel plate 7 and lifting steel plate 6, lifting steel plate locating dowel 6a can realize lifting steel plate 6 with low Being accurately positioned between pressure casting machine workbench 1a, it can be ensured that low pressure casting machine worktable 1a, stalk 3 and combination shell 8 Between coaxial line, and lifting time calibrate efficient and convenient.

It is uniformly provided with breathable microporous 8e in the upper portion side wall of thin-wall product shell 8a.Molten metal along die cavity be gradually increasing time, Gas above die cavity can be entered in dry sand 9b by breathable microporous 8e, prevents the interior generation of die cavity from feeling suffocated and causes foundry goods gas occur The defect such as hole and misrun.

The end face outer rim of lifting steel plate 6 is arranged with lifting steel plate suspension ring 6b, and the end face outer rim of moulding steel plate 7 is arranged with Moulding steel plate suspension ring 7b.

Combination shell 8 is fabricated by the most as follows: (1) make combination wax-pattern, and combination wax-pattern includes depending on from top to bottom The thin-wall product wax-pattern of secondary connection, ingate wax-pattern, cross gate wax-pattern and cup wax-pattern, cup wax-pattern 14 is up-small and down-big Cone, the upper end of cup wax-pattern 14 is connected with the center of cross gate wax-pattern 15, each termination water of cross gate wax-pattern 15 Flat being outwards symmetrically extended, above each termination of cross gate wax-pattern 15, lower end with ingate wax-pattern is connected respectively, each ingate wax The upper port of mould lower surface with thin-wall product wax-pattern respectively is connected.As shown in Fig. 8 to Figure 12, cup wax-pattern 14 is hollow Circular cone tubular, cross gate wax-pattern 15 is hollow square-section, and each end of cross gate wax-pattern 15 is coated with cross gate plug Seam crossing is also welded complete with electric cautery by 15a.Cross gate plug 15a forms with little plug mould compacting, cross gate plug The inner face of 15a is provided with plug step, and plug step is respectively embedded in the port of cross gate wax-pattern 15, cross gate plug 15a Outer rim concordant with the outer rim of cross gate wax-pattern 15.(2) at combination wax pattern surface uniform fold investment precoat, on investment precoat One layer of white fused alumina sand of uniform fold, then makes combination wax pattern surface be dried formation surface layer type indoor storage 5.5～6.5 hours Shell.(3) after blowing away the unnecessary sand grains on surface shell surface, at surface shell surface uniform fold ground floor backing layer coating, first Uniform fold ground floor backing layer sand on layer backing layer coating, forms second layer shell after drying indoor storage 10～12 hours.⑷ After blowing away the unnecessary sand grains on second layer shell surface, at second layer shell surface uniform fold second layer backing layer coating, second Uniform fold second layer backing layer sand on layer backing layer coating, forms third layer shell after drying indoor storage 10～12 hours.⑸ After blowing away the unnecessary sand grains on third layer shell surface, at third layer shell surface uniform fold third layer backing layer coating, the 3rd Uniform fold third layer backing layer sand on layer backing layer coating, forms the 4th stratotype shell after drying indoor storage 10～12 hours.⑹ The method the most same according to step continues to sequentially form the five, the six stratotype shells in combination wax-pattern periphery.(7) blow away layer 6 shell After the unnecessary sand grains on surface, at layer 6 shell surface uniform fold layer 6 backing layer coating, indoor storage 10～12 hours Dried formation layer 7 shell；(8) the above-mentioned combination wax-pattern being coated with shell is placed in high steam dewaxing kettle, makes combination Wax-pattern is at high temperature melted out, and obtains the combination shell of cavity；(9) the combination shell having taken off wax is put in roaster, use The high-temperature roasting 1 of 1050 ± 10 DEG C～1.2 hours, be subsequently cooled to 500 ± 10 DEG C.

This utility model low pressure is lost the work process of the close casting system of cerotin and is in turn included the following steps: (1) by moulding steel plate 7 are placed on smooth ground, place sandbox 9 on moulding steel plate 7, and combination shell 8 is placed in the centre bore of moulding steel plate 7 In, the cup shell 8d of combination shell 8 down and combination shell 8, sandbox 9 all with the centre bore coaxial line of moulding steel plate 7； (2) the gap between lower, outer perimeter and the moulding steel plate center bore inner wall of cup shell 8d is filled in real with asbestos cord 11, then watering The upper periphery of cup shell 8d uses clay-bonded sand 9a to tamp fixing, and the top of clay-bonded sand 9a is filled under cross gate shell 8c Side, the bottom of clay-bonded sand 9a is against the top of moulding steel plate 7；(3) use dry sand 9b to be filled up by sandbox 9, the periphery of clay-bonded sand 9a, The periphery of combination shell 8 and the inner space of thin-wall product shell 8a are all tamped by dry sand 9b, and with scraper plate by sandbox 9 top Dry sand 9b strike off；(4) moulding steel plate 7 integral hoisting is placed on lifting steel plate and makes both fixing connections, moulding steel plate The centre bore of 7 and the centre bore coaxial line lifting steel plate；(5) by overall together with moulding steel plate 7 thereon and sandbox 9 for lifting steel plate Hang and be fixed on the workbench of air injection machine, cover at sandbox 9 top and compress steel plate 10, use hold down gag to be pressed in pressure On tight steel plate 10；(6) holding furnace is advanced into operating position and makes stalk 3 and combination shell 8 coaxial line of holding furnace, pass through liquid Pressure lowering or hoisting gear makes holding furnace rise, until the upper port of stalk 3 is docked with the lower port of cup shell 8d and both it Between realize seal；(7) being passed through compressed gas to the gas-phase space of holding furnace, the molten metal bottom holding furnace rises along stalk 3, Enter in the die cavity of combination shell 8 from the lower port of cup shell 8d, and the most successively by cup shell 8d, horizontal water The die cavity of road shell 8c, ingate shell 8b and thin-wall product shell 8a is full of, and then the molten metal in thin-wall product die cavity exists Under Pressure Solidification；(8) the gas-phase space of holding furnace is exitted, make the gauge pressure in holding furnace be rapidly reduced to 0MPa, stalk 3 and the non-frozen metal liquid stream of top return in holding furnace；Then remove hold down gag and compress steel plate 10, lifting steel plate is connected Knockout is carried out to knockout region with moulding steel plate 7 thereon and sandbox 9 Integral lifting.Cut redundance after knockout and i.e. obtain thin Wall product 16, as shown in figure 13.

The foregoing is only the preferable possible embodiments of this utility model, non-therefore limit to patent of the present utility model Protection domain.In addition to the implementation, this utility model can also have other embodiments.All employing equivalents or equivalence become Change the technical scheme of formation, all fall within the protection domain of this utility model requirement.

Claims (8)

1. low pressure loses the close casting system of cerotin, including the holding furnace being positioned in air injection machine, the liquid phase of described holding furnace Space is inserted with stalk, and the gas-phase space sidewall of described holding furnace is connected with compressed air hose by intake valve, described stalk Top stretch out described holding furnace and be positioned at described air injection machine table core hole in, it is characterized in that: described low die casting The workbench making machine is fixedly arranged above lifting steel plate, described lifting steel plate be fixedly arranged above moulding steel plate, described moulding steel plate Be fixedly arranged above sandbox, the top of described sandbox is coated with compression steel plate, is pressed with hold down gag, institute above described compression steel plate The lumen centers stating sandbox is provided with combination shell, described combination shell and described stalk coaxial line；Described combination shell includes The most through thin-wall product shell, ingate shell, cross gate shell and cup shell, described cast gate cup type The lower end of shell is positioned in the centre bore of described moulding steel plate and seals between the two, and the lower port of described cup shell is with described The upper port of stalk seals docking；The periphery of described combination shell and the inner space of described thin-wall product shell are filled with dry Sand.

Low pressure the most according to claim 1 lose the close casting system of cerotin, it is characterized in that, described cup shell be upper little under Big horn mouth, the upper port of described cup shell is connected with the center of cross gate shell and is mutually communicated, and described horizontal waters Each termination of road shell is horizontally outward symmetrically extended, above each termination of described cross gate shell respectively with described ingate shell Lower port connect and be mutually communicated, the upper port of each described ingate shell respectively with the lower surface of described thin-wall product shell Connect and be mutually communicated.

Low pressure the most according to claim 1 loses the close casting system of cerotin, it is characterized in that, outside the bottom of described cup shell Being filled with asbestos cord between all and center bore inner wall of described moulding steel plate, the upper periphery of described cup shell is coated with stone Cotton pad, the periphery of described asbestos pad is coated with muff, and described muff is surrounded by symmetrical two halves and is spliced.

Low pressure the most according to claim 3 loses the close casting system of cerotin, it is characterized in that, being covered over of described muff Clay-bonded sand, the top of described clay-bonded sand is filled in the lower section of described cross gate shell, and the underfill of described clay-bonded sand is described The top of moulding steel plate, the periphery of described clay-bonded sand is filled with described dry sand.

Low pressure the most according to claim 1 loses the close casting system of cerotin, it is characterized in that, the runner internal diameter of described stalk is big In the lower port internal diameter of described cup shell, the top of described stalk is provided with discoid stalk flange, described liter of liquid Pipe flange is positioned in the table core hole of described air injection machine；It is provided with protruding upward in the middle part of the end face of described stalk flange Flange collar, described flange collar is positioned in the centre bore of described lifting steel plate, and the inner circumferential of described flange collar forms step in flange, described convex The periphery of circle forms flange outer step, and in described flange, step is higher than described flange outer step, and in described flange, step is with described It is provided with interior sealing gasket between the lower surface of moulding steel plate, is provided with between the lower surface of described flange outer step and described lifting steel plate External seal pad.

Low pressure the most according to claim 1 loses the close casting system of cerotin, it is characterized in that, the lower surface of described lifting steel plate is even Being connected to four lifting steel plate locating dowels, the lower end of each described lifting steel plate locating dowel inserts described low pressure casting machine worktable respectively Locating slot in；The lower surface of described moulding steel plate connects four moulding steel plate alignment pins, each described moulding steel plate alignment pin Lower end insert respectively in the hole, location of described lifting steel plate.

Low pressure the most according to claim 1 loses the close casting system of cerotin, it is characterized in that, the top of described thin-wall product shell Breathable microporous it is uniformly provided with on sidewall.

Low pressure the most according to claim 1 loses the close casting system of cerotin, it is characterized in that, the end face outer rim of described lifting steel plate Being arranged with lifting steel plate suspension ring, the end face outer rim of described moulding steel plate is arranged with moulding steel plate suspension ring.