CN108941513A - Metallic pressure conveys shell moulded casting method - Google Patents
Metallic pressure conveys shell moulded casting method Download PDFInfo
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- CN108941513A CN108941513A CN201811120298.4A CN201811120298A CN108941513A CN 108941513 A CN108941513 A CN 108941513A CN 201811120298 A CN201811120298 A CN 201811120298A CN 108941513 A CN108941513 A CN 108941513A
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- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000010120 permanent mold casting Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
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- 229910001208 Crucible steel Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of metallic pressure conveying shell moulded casting method, it is intended to, a kind of high efficiency, high quality, high yield rate, the shell moulded casting method of technological flexibility too are provided.The technical scheme is that: shell moulded casting device of the vacuum in conjunction with pressure is divided into the vacuum chamber being isolated up and down and pressurising room, the sandbox for being built-in with the multilayer casting unit that multiple resin-coated sand shell moulds are superimposed as is enclosed in vacuum chamber negative pressure field, one cylindrical hole of perforation connects as upright casting road with the stalk of insertion pressurising room casting ladle inner metal liquid in multilayer casting unit.When casting, simultaneously to vacuum chamber, with compressed gas to the pressurising of pressurising room, molten metal is steadily risen under the action of two chamber pressures difference by stalk, into the upright casting road of vacuum indoor multilayer casting unit, type casting successively is filled to each casting mold type chamber of each resin-coated sand shell mould from bottom to up, to molten metal full of casting mold type chamber and in normal pressure cooled and solidified off field, completes the casting to shell mould.
Description
Technical field
The present invention relates to the casting of metal casting field shaping technique metal, especially but are not to relate solely to ferrous metal
The casting of steel.Relate generally to a kind of foundry engieering using crab process Casting Principle production casting class part, and in particular to
To the shell moulded casting device and method of vacuum implementation synchronous with compression casting.
Technical background
Casting is that the liquid metal smelted is prepared in advance with the injection of casting, injection, sucking or other casting methods
Casting mold in, the obtained object with certain shapes, size and performance after cooling.Casting Accurate Shaping is zero most saved
Part manufacturing method.The characteristics of intricate casting, is that type chamber is narrow, and having many bends or curves, and flowing to be varied multiple times in aluminium alloy stowing operation
Direction, long flow path, temperature reduce significant, the thus increase of liquid metal fluid viscosity, and viscous force and surface tension increase, thus its
Resistance is filled to increase.Molten metal is known as being poured from the operating process of casting ladle injection casting mold.Pouring operation is improper to be caused to pour not
The casting defects such as foot, cold shut, stomata, shrinkage cavity and slag inclusion.The liquid condition shaping of metal is frequently referred to cast.It is to be poured liquid metal
Into casting mold type chamber, after its cooled and solidified, the method that obtains the blank or part of certain shapes.It is obtained using casting method thin
The key of wall casting is to solve the problems, such as liquid metal filling.Only molten metal is filled up completely casting mold, and it is complete can to obtain shape
Whole casting.And path and the mode of molten metal filling cast, help to form advantageous temperature field and pressure field in casting
And realize optimal solidification mode, thus solidified structure and cast properties needed for obtaining.The method of cast form is broadly divided into
Two class of sand casting and Special Processes of Metal Castings.The casting method of casting, referred to as sand casting are produced in sand mold.It is different from sand casting
Casting method be known as Special Processes of Metal Castings.Special Processes of Metal Castings include metal casting, compression casting, centrifugal casting, model casting, low pressure casting
It makes, ceramic mold casting, continuously casting and extrusion casint etc..Permanent mold casting is also known as diecasting, it is to pour into liquid metals
Metal mold, to obtain a kind of casting method of casting, casting mold is made of metal, and it is repeatedly (several hundred time to arrive that it can be used repeatedly
Thousands of times).The permanent mold casting fertile casting of institute at present, in weight and vpg connection, there are also certain limitations, such as to black
Metal can only be the casting of simple shape；The weight of casting can not be too big；Wall thickness is also restricted, and lesser casting section thickness can not be cast
Out.Permanent mold casting is compared with sand casting: technically with economically have many advantages, permanent mold casting does not have to sand or few
With sand, the precision and surface smoothness of casting are higher than sand-cast, and quality and dimensionally stable；Process is simple, easily realization machine
Tool and automation, high production efficiency.Also there is shortcoming, as metal mold manufacturing cost is high, metal mold is airtight, and without moving back
Allowing property, the defects of easily causing casting pouring insufficient but cracking or white iron piece.Casting is divided by the pouring technology of molten metal
Gravitational casting and compression casting.Gravitational casting refers to that molten metal injects the technique of casting mold under terrestrial gravitation effect, also referred to as casts.
The gravitational casting of broad sense includes sand casting, metal mold casting, model casting, lost foam casting, mud mould casting etc.；The weight of narrow justice
Power casting refers exclusively to metal mold casting.Compression casting refers to that molten metal injects the work of casting mold under other external force (without gravity) effects
Skill.The compression casting of broad sense includes compression casting and vacuum pressing and casting, low pressure casting, centrifugal casting of die casting machine etc.；The pressure of narrow justice
Power casts the metal mold compression casting for referring exclusively to die casting machine, abbreviation die casting.Compression casting die casting) essence be high pressure effect under,
Make liquid or semi-liquid metal with higher speed fill die-casting die (die casting) type chamber, and under stress form and solidify and
The method for obtaining casting.Casting dimension accuracy is high, and surface smoothness is good, and intensity and hardness are higher, dimensionally stable, and interchangeability is good；
It can the thin-wall complicated casting of die casting.Although die casting has many advantages, but there are also disadvantages, to be resolved.Such as: when die casting due to
Liquid Metal Filling type chamber speed is high, and fluidised form is unstable, and casting is also easy to produce stomata, not can be carried out heat treatment；Concave complexity
Casting, die casting are more difficult；The die-casting die service life is lower.
In existing foundry engieering, sand casting is most extensive, the most flexible method of Application in Foundry.It can be not only used for list
Part, small serial production hand moulding, it can also be used in batch, the machine molding of mass production and automatic assembly line；It can be poured low
Fusing point nonferrous metal and its aluminium alloy, and dystectic iron liquid and molten steel can be poured；The size of casting is changeable, and shape can letter
Dan Yike is complicated.Disadvantage: a type can only be poured once, and the process of production is more, and the factor for influencing casting quality is also more, casting
It is second-rate.Smallclothes small serial production, unessential part, especially big piece are applied in sand casting.
Precoated sand casting technique is to be covered with certain thickness overlay film layer of sand on molding metal die inner cavity and form casting mold
Shell.Precoated sand is because it is with good fluidity, easily forming, and collapsibility is good, easy sand removal, and the dimensional accuracy for generating casting is high, surface
High-quality feature, and on the small and complicated casting such as be widely used in hydraulic valve door body.With resin sand manufacture shell casting mold or
Shell core can substantially reduce the molding sand quantity used, and the casting of acquisition is clear-cut, any surface finish, accurate size, can not have to machine
Tool processing or only a small amount of processing.Therefore shell moulded casting is larger especially suitable for production batch, dimension precision requirement is high, wall is thin and shape
The casting of the various alloys of shape complexity.Shell moulded casting using mold using positive-pressure gating system is withstood, i.e., sprue, horizontal pour
Road, ingate in the top of casting, be vented, keeps away that slag effect is bad, and molten iron is more serious to washing away for type chamber.If the intracavitary presence of type
Remaining dross or molding sand overlap, are easily washed and are deposited in the upper part of casting, cause burning into sand；Molten iron purification is not thorough,
Residue flows into type chamber and is not easy to be discharged, and causes slag inclusion；Hot metal flow is fashionable, and ingate is full of by molten iron, and type intracavity gas cannot be whole
Effectively discharge, causes stomata.There are shrinkage porosites at casting boss.And the resin price that shell moulded casting uses is expensive, and template is necessary
Precision Machining, higher cost can also generate smell excitatory in casting, this limits this method to a certain extent
Extensive use.
Vacuum pressing and casting is generally divided into two kinds of forms of suction pouring and evacuated die-casting process, and suction pouring is will to melt gold using negative pressure
Belong to sucking casting mold (crystallizer), cause vacuum type is intracavitary, metal from bottom to top induction type chamber, carries out the casting of solidification forming
Make the casting method of method.The basic principle is that the crystallizer connecting with vacuum system (is cast using vacuum system device
Type), molten metal is immersed, negative pressure is caused in crystallizer, molten metal is sucked into cylinder-shaped graphite casting mould or metal mold from crucible
In, vacuumizing makes to suck in wall molten metal at negative pressure in crystallizer and be connected with recirculated cooling water crystallizer, molten metal therein
Realize the consecutive solidification by export-oriented center.After the ingate solidification of casting, negative pressure is removed, not solidified metal in sprue is enabled
Liquid returns to crucible and flows back in molten bath, obtains tubular casting.The periphery of inner wall of crystallizer (water-cooled metal mould) is water-cooled, crystallizer
Suitable for reading to connect vacuum system in lower mouth embedment molten metal, molten metal rises up into crystallizer internal cavity, gold in crystallizer under atmospheric action
Belong to liquid to be solidified by export-oriented center, to be solidified when reaching required thickness, by crystallizer connection atmosphere suitable for reading, crystallizer center is not
The molten metal whereabouts of solidification is back in crucible, obtains hollow columnar casting.Due to the filling velocity < 1m/s of suction pouring, and
And casting mold needs to preheat, the defects of otherwise generating cold shut, misrun.Column casting hollow wall unevenness is larger, hole size
It is not easy correctly to control, complex-shaped casting cannot be produced, and the inner surface of casting is rough, size is not easy to control.
Evacuated die-casting process be casting die is intracavitary establish certain vacuum degree after carry out die casting, vacuum degree generally 50~
Within the scope of 80kPa, metal carries out the casting process of melting, casting and crystallization in a vacuum chamber.This casting method is mainly used for
Small part or jewelry with exquisite details.It closes entire compression mod using vacuum (-tight) housing, and vacuum (-tight) housing is by entire die casting when molding
Molding is closed, and after liquid metal pours into pressure chamber, is sealed pressure chamber using injection punch head, is then opened vacuum valve, will be empty in vacuum (-tight) housing
Gas extraction, can carry out die casting when vacuum degree reaches requirement.Evacuated die-casting process has been entrained into more in forming process due to die casting
Scattered air, casting gas when being heat-treated can expand and cast(ing) surface caused to deform.Low pressure casting is able to produce quality
More demanding intricate casting, but due to the presence of gas in casting mold, it is easy to happen and wraps up in gas, needle pore defect.And the knot of casting
Crystal solidification pressure is low (< 0.05MPa), and the tissue of casting is not fine and close enough, and the requirement of high-performance casting is not achieved.Low pressure casting work
The casting of skill, it is apparent the disadvantage is that: the sealing system of equipment easily leaks, Pressurizing System low precision；Stalk is perishable,
Being mingled in pipe is difficult to clean off, and stalk easily premature solidification blocking topmost, causes productivity, decrease in yield.In addition,
Low pressure casting molten metal crystallization and freezing pressure is low, is not enough to prevent the hydrogen in molten metal to be precipitated and generate pin hole, therefore should not use
In the production of the aluminium alloy castings of high-compactness.
Although fusible pattern suction pouring has organization of production flexible, convenient for the production of small lot multi items, product air holes waste product
Rate is lower, the higher feature of metal yield rate, but the disadvantages are as follows:
(1) formwork is constituted by repeatedly coating coating, and quality is not easy to stablize, and gas permeability be far below common sand core, therefore there are still
More quality problems, such as the white mould slag bring slag inclusion after gasifying；Since thick coating gets angry bring pin hole, filling velocity not
Sufficient bring pipe cold shut defect is more etc.；
(2) since maximum vacuum can not be higher than a negative atmospheric pressure, for suction casting, molten metal lifting height has
Limit, metal such as stainless steel biggish for specific gravity etc., the casting number of plies, suction casting height are extremely restricted.Lead to production efficiency not
High problem.Dreg defect increases considerably if using upper casting, while increased stream running channel length loses vacuum again and pours
Cast the advantage of higher yield rate.
The essence of compression casting highpressurediecasting (abbreviation die casting) be high pressure effect under, make liquid or
Semi-liquid metal fills die-casting die (die casting) type chamber with higher speed, and forms under stress and solidify and obtain casting
Method.Although die casting has many advantages, but there are also disadvantage, since liquid Metal Filling type chamber speed is high when die casting, stream
State is unstable, therefore uses general casting die, and casting is also easy to produce stomata, not can be carried out heat treatment；The casting of concave complexity, die casting
It is more difficult.High-melting-point alloy (such as copper, ferrous metal), the die-casting die service life is lower, unsuitable small lot production, the main reason is that
The manufacturing cost of die-casting die is high, and small lot production is uneconomical.Generally no longer it is machined and is directly used.Simple pressure
It casts maximum advantage to be, very high filling velocity can be obtained, produced especially with metal mold, can get good table
Face quality.This for poor fluidity, cavity filling can bad magnesium alloy can preferably fill type, to reduce, to fill type complete or again
Skin cold shut waste product；But the disadvantages are as follows: being difficult to if metal casting higher for fusion temperature (such as stainless steel) using metal
Mould, and sand mo(u)ld is used, pressure-type chamber is again totally unfavorable to sand mo(u)ld exhaust.Since die casting generally uses higher filling velocity,
The defects of when being injected into casting mold, high-velocity wire liquid stream generates whirlpool, wraps up air, forms stomata and oxide inclusion, reduces
The Metallurgical Quality and service performance of casting.No matter the good control difficult to realize to mold filling pressure of common gravitational casting, be poured
How rationally system is designed, to be all difficult to avoid splashing and turbulent flow, so that casting is generated the castings such as deficient casting, loose oxide inclusion and lacks
It falls into.If the direction opposite with gravity direction is used to provide mold filling pressure for molten metal, fill molten metal reversely from the bottom to top
Into type chamber, it is likely that realization accurately controls mold filling pressure.
Currently, the highest casting production process of production efficiency surely belongs to tide mould sand automatic modeling Wiring technology, especially in steel
The production field of casting；The resin-coated sand shell mould for assembling completion in advance is directly placed into the tide mould sand type chamber that mo(u)lding line presses by manipulator
Interior, molding can cast.But the technique is most difficult to overcome the problems, such as, metal stream is had to through tide mould sand runner ability
Into resin-coated sand shell mould mold cavity forming.In addition when molten steel is toppled over from ladle the problems such as inevitable slag, when using the technique
Various types of rejection rates are higher, and tide mould sand stream running channel is longer in addition, are difficult to significantly using the metal yield rate of the technique
It improves.Another kind is the shell mould gravitational casting being currently widely used, although product quality is generally higher than tide mould sand, is also had higher
Production efficiency and metal yield rate.But still there is difference in product quality and metal yield rate compared with pressure casting and vacuum casting
Away from.
Currently, extrusion casting machine used in extrusion casint industry is transformed by Universal hydraulic press mostly.UP
The substantially casting manually by rule of thumb of the extrusion casint part of machine production, it is unstable to be poured part performance manually.Due to General hydraulic
Machine does not have special running gate system, frequently with the manual pouring type of die sinking.In manual casting process, molten metal is from casting ladle or pours
The process that spoon is poured into mold cavity can not accurately control poring rate, be easy that molten metal is made to generate splashing in casting process, together
When in casting process molten metal be easy to produce volume gas, aoxidize molten metal, to seriously affect extrusion casint product matter
Amount especially can not carry out accurate quantification casting during manual casting, can only by virtue of experience or meter ladle etc. more
Simple mode, which labor intensity is larger, and the product of acquisition cannot be guaranteed dimensional accuracy, and production efficiency is lower, is not suitable for
Mass mechanized production.
Summary of the invention
In place of in view of the shortcomings of the prior art, a kind of high efficiency, high quality are provided, height is produced
Rate, shell moulded casting of the shell moulded casting method and its vacuum that the big vacuum of technological flexibility and Simultaneous Pressure are implemented in conjunction with pressure
Device.
Above-mentioned purpose of the invention can be achieved by following technical proposals: a kind of metallic pressure conveying shell mould casting
Method is made, have following technical characteristic: the shell moulded casting device first by vacuum in conjunction with pressure is divided into the vacuum being isolated up and down
Room 2 and pressurising room 5, the sandbox 3 for being built-in with multilayer casting unit 14 are enclosed in 2 negative pressure field of vacuum chamber, hold pouring for molten metal
Packet 7 is placed in the pressurising room 5 of compressed air suits, while the stalk 4 of 2 housing bottom of vacuum chamber assembly is inserted into casting ladle 7
In molten metal；2 obturator of vacuum chamber moves down in place and locks, and warehouse lid 15 forms envelope to the open topped part in pressurising storehouse 16
It closes, and compresses the sealing (8) of pressurising room 5, pressurising room of the formation with sealed environment after the locking of storehouse is closed in warehouse lid 15 and pressurising storehouse 16
5, while stalk 4 being inserted into the molten metal of casting ladle 7, so as to form shell moulded casting device of the vacuum in conjunction with pressure；Its
In, at least one set of multilayer casting unit 14 being embedded in casting model powder 17 is set in sandbox 3, sets one in each resin-coated sand shell mould 1
Hollow circuit cylinder runner 11 therethrough is formed at least two in each resin-coated sand shell mould 1 around its hollow circuit cylinder runner 11 simultaneously
The casting mold type chamber 12 communicated therewith, and the resin-coated sand shell mould 1 of at least two longitudinal stacks constitutes one group of multilayer casting unit 14；
The through-hole of the same hollow circuit cylinder runner 11 for organizing each resin-coated sand shell mould 1, which coaxially connects, constitutes upright casting road 13, is connected to 4 conduct of stalk
The casting sprue of molten metal 6；When casting, while vacuum chamber 2 is vacuumized by vacuum orifice 10 and passes through 5 shell of pressurising room
On 9 pairs of pressurising rooms 5 of pressurising mouth be filled with compressed gas, gradually establish the pressure difference between vacuum chamber 2 and pressurising room 5, pass through control
Pressure difference change rate between vacuum chamber 2 and pressurising room 5 accurately to control the filling velocity of molten metal, and molten metal 6 is poor in two chamber pressures
Under the action of by stalk 4 steadily rise, into vacuum chamber 2 in multilayer casting unit 14 upright casting road 13, from bottom to up by
Layer to each casting mold type chamber 12 of each resin-coated sand shell mould 1 realize it is steady, quickly fill type casting, and be full of each casting mold type chamber
12, it keeps two upper and lower chambers pressure difference or continues to lift up pressure difference, molten metal in casting mold type chamber 12 is made to be under positive pressure force field cooling
Solidification.
Using present invention has an advantage that
It is high-efficient.The present invention is assemblied in vacuum chamber 2 using the sandbox 3 for being built-in at least one set of multilayer casting unit 14, sandbox 3
In, every group of multilayer casting unit 14 is made of at least two resin-coated sand shell moulds, 1 longitudinal stack, is had in every group of multilayer casting unit 14
One cylindrical hole therethrough, is connected to each resin-coated sand shell mould 1 and constitutes upright casting road 13 and connect with stalk 4；By true
Multiple groups multilayer casting unit 14 is connected respectively the arrangement of more stalks 4 in 2 sandbox 3 of empty room, can greatly improve sandbox 3
Single case casting mold quantity, more casting of casting, effectively improves production efficiency.It is filled while vacuum chamber 2 vacuumizes due to using
Pressure chamber 5 treats the pressure of casting metals liquid 6, makes 2 negative pressure of vacuum chamber, and pressurising room 5 is positive pressure, increases effectively the pressure difference of two Room,
It overcomes fusible pattern process for suction casting and inhales the insufficient problem of casting height, work continuously, high degree of automation not only can be mentioned significantly
The filling velocity of height casting reduces cold shut defect, also greatly improve 2 inner metal liquid face of vacuum chamber can lifting height, therefore can
To arrange more resin-coated sand shell moulds 1 in short transverse in a vacuum chamber 2.By 5 rising pouring mode of pressurising room by molten metal
6 are transported in the casting mold type chamber 12 in vacuum chamber 2, and molten metal is in cooled and solidified under positive pressure force field in casting mold type chamber 12,
Shrinkage defect is greatly reduced, and mechanical property significantly improves.Liquid level rises steady in entire cavity filling process, is not likely to produce nature pair
Stream, is not susceptible to volume gas, die closing casting may be implemented, to improve the quality and production efficiency of casting, production efficiency ratio is adopted
10 times or more are improved with the production of fusible pattern process for suction casting.
Quality is high.Casting mold is placed in 2 negative pressure field of vacuum chamber by the present invention, and molten metal 6 is placed on the pressurising room 5 of controllable pressure
It is interior, filling velocity is controlled by the vacuum degree and the pressure of pressurising room 5 that control vacuum chamber 2, molten metal tied under stress
Crystal solidification can make casting densification, intensity high, and strength character is greatly improved than suction pouring or gravitational casting.Compare vacuum
20-30% will be higher by by inhaling casting and gravitational casting, and elongation percentage is higher by nearly 50%.Than traditional gravitational casting, suction pouring or low pressure
Casting method has apparent advantage.By controlling the charge flow rate of pressurising room, different pressure difference change rates is obtained, difference is obtained
Filling velocity, can select different filling velocities for the different wall thickness and complexity of casting, completely be perfected
Casting.Due to using Quick-pressing pressure retaining technology, keep metal casting internal porosity, shrinkage cavity seldom, dense internal organization.It can be right
Different technological parameters can be used in different casting thickness, different complexities, obtain qualified cast product.Due to this
Invention pressurising storehouse 16 is hollow structure that is salable and can bearing certain pressure and temperature, and before casting, to be cast is filled
The casting ladle 7 of molten metal is placed wherein.The bottom of 2 obturator of vacuum chamber is formed with warehouse lid 15, and 2 obturator of vacuum chamber passes through hydraulic drive
Or machine driving is moved vertically downwardly into position and locks, warehouse lid 15 forms closing to the open topped part in pressurising storehouse 16, and presses
The sealing 8 of contracting pressurising room 5, warehouse lid 15 and pressurising storehouse 16 form the pressurising room 5 with sealed environment after closing storehouse locking, while will rise
Liquid pipe 4 is inserted into the molten metal of casting ladle 7, has been included at least vacuum chamber 2 to be formed, has been placed in vacuum chamber 2 at least one set by more
The vacuum and pressure that multilayer casting unit 14, pressurising room 5 and the stalk 4 that a 1 longitudinal stack of resin-coated sand shell mould is constituted collectively constitute
The shell moulded casting device that power combines.Since stalk 4 is inserted into inside molten metal 6, the danger that smelting slag enters casting type chamber is avoided
Danger, considerably reduces cinder hole defect；Casting is molded over vacuum state completion, and the intracavitary vapour lock of type is greatly reduced, and improves metal
The cold shut and gas hole defect of casting is greatly reduced in the mobility of liquid.Molten metal 6 passes through a liter liquid under the effect of 5 pressure of pressurising room
Pipe 4 enters vacuum chamber 2, improves filling velocity, shortens the liquid metal filling time, reduce casting ladle inner metal liquid temperature reduce and
The defects of generation is mingled with, cold shut, simultaneously because molten metal does not reduce oxide inclusion with contacting external air in entire casting process,
The quality of molded part is improved, the qualification rate of metal casting greatly improves, its casting qualified rate improves compared with gravitational casting
10% or more.
Mold-filling capacity is strong, and yield rate is high.The present invention, which uses, is built-in at least one set of multilayer casting unit 14, and is assembled
In the sandbox 3 of vacuum chamber 2, the pressurising room 5 of salable pressurising is set below vacuum chamber 2, stalk is arranged in the bottom of vacuum chamber 2
4, pressurising room 5 is interior to place the casting ladle 7 for filling molten metal 6, and stalk 4 is inserted into molten metal.Vacuum chamber 2 is vacuumized simultaneously and right
5 pressurising of pressurising room, vacuum chamber 2 vacuumize, and keeping type intracavitary is negative pressure, and the pressure difference passed through between control vacuum chamber 2 and pressurising room 5 becomes
Rate accurately to control the filling velocity of molten metal, and molten metal 6 steadily rises under the action of two chamber pressures difference along stalk 4, into
Enter the upright casting road 13 of multilayer casting unit 14, it is from bottom to up, successively real to each casting mold type chamber 12 on each resin-coated sand shell mould 1
It is now steady, quick to fill type casting, and it is full of casting mold type chamber 12, molten metal is in cold under positive pressure force field in casting mold type chamber 12
But it solidifies, significantly improves Filling Processes of Castings ability and feeding capacity, improve significantly to cast properties, casting can be significantly improved
Metal utilization, reduce machining allowance.The individually controllable pressure chamber of two mutually isolated internal gas pressures, and realize gas
The control equipment of body pressure controlling, it is mutually isolated between lower pressure chamber and upper pressure chamber, and realize being isolated for two pressure chambers and ambient pressure.
Two pressure chambers are connected with positive pressure Force control system and vacuum control system with pipeline respectively simultaneously, introduce gas into or export each pressure
Room can not only realize the control of positive pressure to realize accurate control of the pressure room pressure from negative pressure to positive pressure, additionally it is possible to realize negative
The control of pressure.Since the local outer surface of resin-coated sand shell mould 1 constitutes metal stream pouring gate structure, reduce being fabricated to for special stream running channel
Originally and thus bring metal consumption is useless, improves metal yield rate；Due to casting after the completion of immediately cancel vacuum chamber 2 negative pressure and
The positive pressure of pressurising room 5, under the effect of gravity, the molten metal in upright casting road 13 and stalk 4 can flow back rapidly casting ladle 7, will stand
Molten metal in running channel 13 and stalk 4 all recycles, and thus further improves metal yield rate, product yield can
Up to 90%.
Technological flexibility is big.The present invention is equipped with stalk 4 using the bottom of vacuum chamber 2 and it is built-in at least one set
Multilayer casting unit 14 is formed by multiple 1 longitudinal stacks of resin-coated sand shell mould, is formed in every group of multilayer casting unit 14 cylindrical logical
Hole therethrough, is connected to stalk 4, this cylindrical hole is the upright casting road 13 of multilayer casting unit 14；Every group of upright casting road 13
Bottom can directly connect with respective stalk 4 respectively, can also by confluence brick 18 after runner converges with shared liter
Liquid pipe 4 connects.And is increased by the pressure difference of two Room, is greatly mentioned for 5 pressurising of pressurising room while due to being vacuumized to vacuum chamber 2
High metal bath surface can lifting height, it is possible thereby to arrange more resin-coated sand shell moulds in short transverse in a vacuum chamber
1, process choice is flexible, convenient and efficient.The space that multilayer is cast between unit 14 and sandbox 3 and between multilayer casting unit 14
And its gap be full of casting model powder 17, fill casting model powder 17 purpose: 1, increase resin-coated sand shell mould 1 bearing capacity, 2, fixation it is more
Layer casting unit 14.Therefore, can according to production needs, the quantity of flexible choice multilayer casting unit 14, superposition overlay film arenaceous shell
The number of plies, 4 quantity of stalk and the connection type of type 1, this modular design is so that process choice flexibility is very big.
The present invention combines the advantages of above-mentioned various casting methods and all over the body, is suitable for production complex thin wall castings, strong in casting
It spends in performance, about improves 20%~25% than suction pouring and gravitational casting, elongation percentage then improves about 50%.Casting can be effectively reduced
The stomata of part improves 1% or more the density of casting.The high efficiency of metal casting, high quality, high yield rate can be achieved.
Detailed description of the invention
Fig. 1 is shell moulded casting schematic device of the vacuum of the present invention in conjunction with pressure.
Fig. 2 is the schematic diagram that 2 obturator of Fig. 1 vacuum chamber vertically moves.
Fig. 3 is the partial sectional view of Fig. 1 vacuum chamber sandbox.
Fig. 4 is 1 organigram of Fig. 3 resin-coated sand shell mould.
Fig. 5 is the embodiment schematic diagram of Fig. 1 vacuum chamber sandbox biserial multilayer coating film arenaceous shell type.
Fig. 6 is the embodiment schematic diagram that the multiple rows of multiple row multilayer coating film arenaceous shell type of Fig. 1 vacuum chamber sandbox shares stalk.
In figure: 1 resin-coated sand shell mould, 2 vacuum chambers, 3 sandboxes, 4 stalks, 5 pressurising rooms, 6 molten metals, 7 casting ladles, 8 sealings, 9
Pressurising mouth, 10 vacuum orifices, 11 hollow circuit cylinder runners, 12 casting mold type chambers, 13 upright casting roads, 14 multilayers casting unit, 15 warehouse lids, 16
Pressurising storehouse, 17 casting model powders, 18 confluence bricks, 19 cross hole bottom minimum altitude line, 20 type top of chamber riser height lines, 21 running channels folder
Angle, 22 ingates.
The present invention is specifically described below by embodiment, it is necessary to be pointed out that the present embodiment is served only for this
Invention is further described, and should not be understood as limiting the scope of the invention, and the person skilled in the art in the field can be with
Some nonessential modifications and adaptations are made according to the content of aforementioned present invention, are regarded as protection scope of the present invention.
Specific embodiment
- Fig. 2 refering to fig. 1.According to the present invention, the shell moulded casting device first by vacuum in conjunction with pressure is divided into is isolated up and down
Vacuum chamber 2 and pressurising room 5, be equipped with multilayer casting unit 14 sandbox 3 be enclosed in 2 negative pressure field of vacuum chamber, fill molten metal
Casting ladle 7 be placed in the pressurising room 5 of compressed air suits, while by assembly 2 bottom of vacuum chamber stalk 4 be inserted into casting ladle 7
Molten metal in；At least one set of multilayer casting unit 14 being embedded in casting model powder 17, each resin-coated sand shell mould 1 are set in sandbox 3
A hollow circuit cylinder runner 11 therethrough is inside set, and the resin-coated sand shell mould 1 of at least two longitudinal stacks is constituted more than one
Layer casting unit 14 is formed at least two in each resin-coated sand shell mould 1 around its hollow circuit cylinder runner 11 and the castings that communicate therewith
Type type chamber 12；The through-hole of the hollow circuit cylinder hole runner 11 of each resin-coated sand shell mould 1, which coaxially connects, constitutes upright casting road 13, and connection rises liquid
Main casting runner of the pipe 4 as molten metal 6；The obturator bottom of vacuum chamber 2 is formed with warehouse lid 15, and 2 obturator of vacuum chamber passes through liquid
Pressure transmission or machine driving may be implemented entirety and vertically move, and filling for salable pressurising is equipped with below 2 obturator of vacuum chamber
Storehouse 16 is pressed, places the casting ladle 7 for filling molten metal in pressurising storehouse 16；2 obturator of vacuum chamber moves down in place and locks, warehouse lid 15
Closing is formed to the open topped part in pressurising storehouse 16, and compresses the sealing 8 of pressurising room 5, storehouse lock is closed in warehouse lid 15 and pressurising storehouse 16
Gu the pressurising room 5 with sealed environment is formed after, while stalk 4 being inserted into the molten metal of casting ladle 7, so as to form vacuum
Shell moulded casting device in conjunction with pressure；When casting, vacuum chamber 2 is vacuumized by vacuum orifice 10, while passing through pressurising room 5
9 pairs of 5 pressurisings of pressurising room of pressurising mouth on shell, gradually establish the pressure difference between vacuum chamber 2 and pressurising room 5, molten metal 6 is in vacuum
Under the action of 5 pressure difference of room 2 and pressurising room, multilayer casting unit 14 is entered along the opposite direction of gravity direction by stalk 4
Upright casting road 13 successively provides pressure to the casting mold type chamber 12 in every group of multilayer casting unit 14 from bottom to up and fills type, molten metal 6 by
Under it is supreme it is reversed filling enter casting mold type chamber 12；By the pressure difference change rate between control vacuum chamber 2 and pressurising room 5, come accurate
The filling velocity of molten metal is controlled, molten metal 6 is pressed into stalk 4 rapidly by the biggish pressure in pressurising room 5, while in vacuum chamber 2
Negative pressure field collective effect under, molten metal 6, from bottom to top suction pressure enters casting mold type chamber 12, quickly fill type, under controllable pressure, put down
Steady shaped casting and completion solidification.
Different pressure difference change rate can be obtained and different fill by controlling the charge flow rate of pressurising room 5 by filling type casting
Type speed, wall thickness and complexity that can be different for casting, selects different filling velocities, the casting completely perfected
Part.
In the embodiment described below, shell moulded casting device of the vacuum in conjunction with pressure, comprising: be divided into and being isolated up and down
Stalk 4 is inserted into the molten metal of casting ladle 7 by vacuum chamber 2 and pressurising room 5, the sandbox 3 being enclosed in 2 negative pressure field of vacuum chamber；?
In sandbox 3, at least provided with one group by least two longitudinal stacks be one group of resin-coated sand shell mould 1 constitute with the more of upright casting road 13
Layer casting unit 14；The upright casting road 13 of multilayer casting unit 14 is connected to stalk 4, and stalk 4 passes through 2 lower isolation layer of vacuum chamber
It is inserted into built in pressurising room 5 in the metal bath of casting ladle 7, so as to form shell moulded casting device of the vacuum in conjunction with pressure.
Refering to Fig. 3-Fig. 4.The hollow circuit cylinder runner 11 of multiple resin-coated sand shell moulds 1 is superimposed in vertical direction and penetrates through, and forms gold
Belong to the upright casting road 13 of liquid.Each 1 vertical pile of layer resin-coated sand shell mould composition multilayer is cast unit 14, and multilayer is cast the multiple of unit 14
11 longitudinal stack of hollow circuit cylinder runner is formed through upright casting road 13, and Fig. 4 section view is that there are two the overlay films of casting mold type chamber 12 for interior system
Arenaceous shell type 1, hollow circuit cylinder runner 11 are made of the local outer surface of two casting molds.It can be enclosed on a resin-coated sand shell mould 1
Multiple casting mold type chambers 12 are constructed around its hollow circuit cylinder runner 11；When therefore reducing the cost of manufacture and casting of special stream running channel
Molten metal consumption is useless.The inside of each multilayer casting unit 14 is formed with one and is poured with upright casting road 13 for the tree-like state of casting of mobile jib
Cast flow passage system.The mobile jib of casting tree is upright casting road 13, and the branch for tree of casting is ingate 22, and the leaf for tree of casting is casting mold type
Chamber 12, the mobile jib upright casting road 13 of every casting tree are equipped with every layer of multilayer and multiple lead to the tilting down of casting mold type chamber 12, branch
The ingate 22 of sigmoid forms the tree-shaped casting flow passage system of multilayer umbrella shape for surrounding mobile jib upright casting road 13.The dendroid
From casting mold type chamber 12, inclination crosses hole with the formation of upright casting road 13 curved ingate 22 upwards, acclivitous ingate 22 with it is vertical
The running channel angle 21 that 13 bus of running channel is formed is less than 30 degree.The hole bottom minimum altitude line 19 that crosses of ingate 22 and upright casting road 13
Higher than 12 top riser height line 20 of casting mold type chamber, when ensuring that molten metal flows back downwards in upright casting runner 13, each precoated sand
The molten metal being filled in 1 casting mold type chamber 12 of shell mould will not be lost.Casting mold type chamber 12 in resin-coated sand shell mould 1 can accommodate molten metal
Body, casting mold type chamber 12 are connected to by ingate 22 with upright casting road 13, and shape after the molten metal cooled and solidified in casting mold type chamber 12 is filled with
At mo(u)lded piece.
Refering to Fig. 5.The constituted mode that multiple overlappings of resin-coated sand shell mould 1 form one group of multilayer casting unit 14 can be by scheming
It is at least combined by being formed at least two resin-coated sand shell moulds (1) equipped with 12 vertical pile of sand core casting mold type chamber in two shown in 5
It forms, the multilayer casting unit 14 in the cylindrical hole shape upright casting road 13 with the other end closed at one end connection stalk (4), every group of multilayer
Casting unit 14 can be with the multiple resin-coated sand shell mould 1 of longitudinal stack.Vacuum chamber 2 can same column installation multiple groups multilayer casting unit
14, can also cast unit 14 with this multilayer of row's installation multiple groups, and 13 bottom of upright casting runner of every group of multilayer casting unit 14
Portion can directly connect with respective stalk 4 respectively.Fig. 5 illustrates only the multilayer casting unit 14 of a row two column.
Refering to Fig. 6.Multilayer casting unit 14 can be row multilayer casting unit 14 arranged side by side, two groups of multilayer casting arranged side by side
U-shaped runner in 13 lower end of upright casting road and confluence brick 18 of unit 14, which penetrates through, to converge, and then connects with a stalk 4, and two groups
Multilayer casting unit 14 is fixed in the sandbox 3 for being filled with casting model powder 17.Two upright casting roads of multilayer casting unit (14) arranged side by side
13 after the confluence confluence of brick 18 with shared stalk 4 by connecting, and stalk 4 is inserted into the molten metal 6 of casting ladle 7, in casting ladle 7
Molten metal 6 rises through the U-shaped runner in confluence brick 18 along stalk 4 and is further separated into side by side under the pressure effect of pressurising room 5
Upright casting road 13；After pressure release, under the effect of gravity, after the U-shaped runner confluence that the molten metal in upright casting road 13 passes through confluence brick 18,
It flows into shared stalk 4, is flowed back into the casting ladle 7 of pressurising room 5 by stalk 4, complete to each upright casting road 13 and rise
The recycling of molten metal in liquid pipe 4.
Multilayer casting its arrangement form in sandbox 3 of unit 14 are as follows: can be the multilayer of the column of a row two shown in Fig. 5, Fig. 6
Casting unit 14, two groups of multilayers casting units 14.The arrangement form of multilayer casting unit 14 is also possible to a row two in sandbox 3
Six groups of multilayers casting unit 14, more than nine groups of three rows three column that column, four groups of multilayers casting unit 14 of two rows two column, three rows two arrange
The one of which of a variety of arrangement forms such as layer casting unit 14.Multiple rows of multiple row that multiple longitudinal stack resin-coated sand shell moulds 1 are constituted
Casting unit 14 can be the upright casting road 13, Mei Geduo formed by multiple hollow circuit cylinder runners 11 perforation connection as shown in Figure 5
13 bottom of upright casting road of layer casting unit 14 can directly connect with respective stalk 4 respectively, can also be by as shown in Figure 6
Mode be embedded to confluence brick 18 and form manifold passages, connected after confluence by shared stalk 4.Gold when casting, in casting ladle 7
Belong to liquid 6 by shared stalk 4, the multilayer casting unit of multiple rows of multiple row is further separated by the U-shaped runner in confluence brick 18
14 respective upright casting road 13 successively carries out each resin-coated sand shell mould 1 to fill type casting；It fills after the completion of type casting, releases vacuum chamber 2
Negative pressure and pressurising room 5 positive pressure, under the effect of gravity, molten metal in each upright casting road 13 passes through the U in confluence brick 18
Shape runner is flowed in shared stalk 4, is flowed back into the casting ladle 7 of pressurising room 5 by stalk 4, is completed to each upright casting
The recycling of molten metal in road 13 and stalk 4.
Pressurising room 5 is a hollow structure that is salable and can bearing certain pressure and temperature, before casting, to be cast
The casting ladle 7 for filling molten metal is placed wherein.The bottom of 2 shell of vacuum chamber is formed with warehouse lid 15, before casting starts, being built-in at least
2 obturator of vacuum chamber of one group of multilayer casting 14 sandbox 3 of unit is moved vertically downwardly into position by hydraulic drive or machine driving
And lock, warehouse lid 15 forms closing to the open topped part in pressurising storehouse 16, and compresses the sealing 8 of pressurising room 5, warehouse lid 15 with fill
The pressurising room 5 with sealed environment is formed after pressing storehouse 16 to close storehouse locking, while is inserted into stalk 4 in molten metal 6, is formed complete
Shell moulded casting apparatus system of the vacuum in conjunction with pressure.Casting starts, and synchronizes to two pressure chambers and is vacuumized and filled compressed gas
Body, vacuum chamber 2 gradually build up vacuum degree due to vacuumizing, while importing compressed gas into pressurising room 5, make in pressurising room 5
Air pressure is gradually increased, and gradually forms pressure difference between upper and lower pressure chamber, is changed by the pressure difference between control vacuum chamber 2 and pressurising room 5
Rate accurately to control the flow velocity and filling velocity of molten metal, and anti-gravity direction is by the molten metal 6 in casting ladle 7 along liter from bottom to top
4 suction pressure of liquid pipe, which enters, carries out filling type casting in the casting mold type chamber 12 of top vacuum chamber 2, molten metal 6 is cast by multiple rows of multiple row multilayer
The respective upright casting road 13 of unit 14 successively enters all casting mold type chambers 12 and is steadily full of type chamber.On still guaranteeing after filling type
Pressure difference between lower pressure chamber, or keep the vacuum degree of upper pressure chamber and lower pressure chamber is continued to boost, further increase two upper and lower chambers
Pressure difference improves the pressure difference of two upper and lower chambers as far as possible, not only can effectively keep away in the range of 1 intensity of resin-coated sand shell mould allows
Exempt from molten metal reflux, while solidification feeding effect can be completed for the molten metal in casting mold type chamber 12, driving force is provided；When solidifying
The shrinkage porosite formed therebetween when the solid skeleton formed in journey cannot bear additional pressure or shrinkage cavity may also be compacted and disappear
It loses, significantly improves the consistency of casting, guarantee the raising of its Metallurgical Quality and mechanical property.It fills after the completion of type casting, to casting mold
After molten metal in type chamber 12 solidifies completely, can removal pressure, release vacuum chamber 2 negative pressure and pressurising room 5 positive pressure,
Under gravity, the molten metal in upright casting runner 13 and stalk 4 is flowed back into the casting ladle 7 of pressurising room 5 by stalk 4, complete
The recycling of molten metal in pairs of upright casting runner 13 and stalk 4.
The casting method of above-mentioned casting device is also possible to: when casting starts, first vacuum chamber 2 vacuumized, establishes negative pressure,
After the negative pressure of vacuum chamber 2 is gradually established and reaches setting vacuum degree, that is, switch to the vacuum degree for maintaining vacuum chamber 2, and immediately to filling
Pressure chamber 5 is filled with compressed gas, establishes positive pressure, steps up the pressure of pressurising room 5, until all resin-coated sand shell moulds 1 in sandbox 3
Casting mold type chamber 12 fills type and finishes, and then repeats above-mentioned pressure discharge operations, completes entire casting process.
The outer housing of above-mentioned casting ladle 7 is usually to be made by cast steel or cast iron, and inner wall is made after being lined with refractory material.It is used to
Contain high temperature metal liquid.
The embodiment of the present invention has been described in detail above, and specific embodiment used herein carries out the present invention
It illustrates, the above description of the embodiments is only used to help understand the method and apparatus of the present invention；Meanwhile for the one of this field
As technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of metallic pressure conveys shell moulded casting method, there is following technical characteristic: first by vacuum in conjunction with pressure
Shell moulded casting device is divided into the vacuum chamber (2) being isolated up and down and pressurising room (5), is built-in with the sandbox of multilayer casting unit (14)
(3) it being enclosed in vacuum chamber (2) negative pressure field, the casting ladle (7) for holding molten metal is placed in the pressurising room (5) of compressed air suits,
It simultaneously will be in the molten metal of stalk (4) insertion casting ladle (7) of vacuum chamber (2) housing bottom assembly；Vacuum chamber (2) obturator to
It is moved to position and locks, warehouse lid (15) forms closing to the open topped part of pressurising storehouse (16), and compresses pressurising room (5)
It seals (8), warehouse lid (15) and pressurising storehouse (16) close after storehouse locks and form the pressurising room (5) with sealed environment, while will rise liquid
In the molten metal for managing (4) insertion casting ladle (7), so as to form shell moulded casting device of the vacuum in conjunction with pressure；Wherein, sandbox
(3) multilayer casting unit (14) that at least one set is embedded in casting model powder (17) is set in, sets one in each resin-coated sand shell mould (1)
Hollow circuit cylinder runner (11) therethrough is formed at least two in each resin-coated sand shell mould (1) around its hollow circuit cylinder runner
(11) and the casting mold type chamber (12) that communicates therewith, and the resin-coated sand shell mould (1) of at least two longitudinal stacks constitutes one group of multilayer
It casts unit (14)；The through-hole of the same hollow circuit cylinder runner (11) for organizing each resin-coated sand shell mould (1), which coaxially connects, constitutes upright casting road
(13), casting sprue of connection stalk (4) as molten metal (6)；When casting, while by vacuum orifice (10) to vacuum
Room (2) vacuumizes and is filled with compressed gas to pressurising room (5) by the pressurising mouth (9) on pressurising room (5) shell, gradually establishes true
Pressure difference between empty room (2) and pressurising room (5), by the pressure difference change rate between control vacuum chamber (2) and pressurising room (5) come smart
The really filling velocity of control molten metal, molten metal (6) are steadily risen by stalk (4) under the action of two chamber pressures difference, are entered
The upright casting road (13) of interior multilayer casting unit (14) of vacuum chamber (2), from bottom to up successively to each of each resin-coated sand shell mould (1)
Casting mold type chamber (12) realize it is steady, quickly fills type casting, and be full of each casting mold type chamber (12), keep two upper and lower chambers pressure difference or
Pressure difference is continued to lift up, molten metal in casting mold type chamber (12) is made to be in cooled and solidified under positive pressure force field.
2. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: every group of multilayer casting unit
(14) upright casting road (13) bottom directly connects with respective stalk (4) respectively, or is converged by confluence brick (18) through runner
Connect afterwards with shared stalk (4).
3. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: the closing of vacuum chamber (2)
Body bottom is formed with warehouse lid (15), and vacuum chamber (2) obturator realizes that entirety vertically moves by hydraulic drive or machine driving,
It is equipped with the pressurising storehouse (16) of salable pressurising below, the casting ladle (7) for filling molten metal is placed in pressurising storehouse (16)；Type is filled to pour
After the completion of casting, the negative pressure of vacuum chamber (2) and the positive pressure of pressurising room (5) are released, under the effect of gravity, upright casting road (13) and rises liquid
Molten metal in pipe (4) is flowed back into the casting ladle (7) in pressurising storehouse (16) by stalk (4), complete opposition running channel (13) and
The recycling of molten metal in stalk (4).
4. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: multiple resin-coated sand shell moulds
(1) hollow circuit cylinder runner (11) is superimposed in vertical direction and penetrates through, and forms the upright casting road (13) of molten metal；It fills type casting and passes through control
The charge flow rate of pressurising room (5) processed, obtains different pressure difference change rates and different filling velocities, for the different wall thickness of casting
And complexity, different filling velocities is selected, the casting completely perfected.
5. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: each multilayer casting unit
(14) inside is all formed with a casting flow passage system with the tree-like state of casting that upright casting road (13) are mobile jib, wherein casting tree
Mobile jib be upright casting road (13), the branch for tree of casting is ingate (22), and the leaf for tree of casting is casting mold type chamber (12), and every is poured
The mobile jib upright casting road (13) of casting tree be equipped with multilayer, every layer multiple lead to the tilting down of casting mold type chamber (12), branch sigmoid
Ingate (22), formed one surround mobile jib upright casting road (13) the tree-shaped casting flow passage system of multilayer umbrella shape.
6. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: poured in dendroid is curved
From casting mold type chamber (12), inclination and upright casting road (13) form cross hole, acclivitous ingate (22) and upright casting upwards in road (22)
The running channel angle (21) that road (13) bus is formed is less than 30 degree；The minimum height in hole bottom that crosses of ingate (22) and upright casting road (13)
It spends line (19) and is higher than riser height line (20) at the top of casting mold type chamber (12), to ensure that molten metal flows back downwards in upright casting runner (13)
When, the interior molten metal being filled with of each resin-coated sand shell mould (1) casting mold type chamber (12) will not be lost.
7. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: at least by being formed in two
At least two resin-coated sand shell moulds (1) equipped with sand core casting mold type chamber (12) vertical pile are composed, with the other end closed at one end
The multilayer for being connected to the cylindrical hole shape upright casting road (13) of stalk (4) is cast unit (14), and every group of multilayer casting unit (14)
The multiple resin-coated sand shell moulds of longitudinal stack (1)；Casting mold type chamber (12) in resin-coated sand shell mould (1) can accommodate metal liquid, casting mold type
Chamber (12) is connected to by ingate (22) with upright casting road (13), is formed after the molten metal cooled and solidified being filled in casting mold type chamber (12)
Mo(u)lded piece.
8. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: vacuum chamber (2) same column peace
Multiple groups multilayer casting unit (14) is filled, and/or this multilayer casting unit (14) of multiple groups, and every group of multilayer casting are installed with row
Upright casting runner (13) bottom of unit (14) directly connects with respective stalk (4) respectively；The interior multilayer casting unit of sandbox (3)
(14) arrangement form is that a row two arranges, four groups of multilayers of two rows two column are cast unit (14), six groups of multilayers of three rows two column are poured
Cast unit (14), nine groups of multilayers of three rows three column are cast unit (14), the one of which of a variety of arrangement forms.
9. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: two groups of multilayer casting arranged side by side
U-shaped runner in upright casting road (13) lower end of unit (14) and confluence brick (18), which penetrates through, to converge, then with stalk (4) phase
It connects, two groups of multilayer casting unit (14) are fixed in the sandbox (3) for being filled with casting model powder (17)；Multilayer casting unit (14) arranged side by side
Two upright casting roads (13) by connecting after confluence brick (18) confluence with shared stalk (4), stalk (4) insertion casting ladle
(7) in molten metal (6), the molten metal (6) in casting ladle (7) rises under the pressure effect of pressurising room (5) along stalk (4)
Upright casting road (13) arranged side by side is further separated by the U-shaped runner in confluence brick (18)；After pressure release, under the effect of gravity, upright casting road
(13) it after the U-shaped runner confluence that the molten metal in passes through confluence brick (18), flows into shared stalk (4), passes through stalk
(4) it flows back into the casting ladle (7) of pressurising room (5), completes the recycling to molten metal in each upright casting road (13) and stalk (4).
10. metallic pressure as described in claim 1 conveys shell moulded casting method, it is characterised in that: each multilayer casting is single
Upright casting road (13) bottom of first (14) directly connects with respective stalk (4) respectively, or is formed by embedment confluence brick (18)
Manifold passages are connected by shared stalk (4) after confluence；When casting, the molten metal (6) in casting ladle (7) passes through shared
Stalk (4) is further separated into each self-support of multilayer casting unit (14) of multiple rows of multiple row by the U-shaped runner in confluence brick (18)
Running channel (13) successively carries out each resin-coated sand shell mould (1) to fill type casting；It fills after the completion of type casting, releases the negative of vacuum chamber (2)
Pressure and the positive pressure of pressurising room (5), under the effect of gravity, the molten metal in each upright casting road (13) pass through in confluence brick (18)
U-shaped runner is flowed in shared stalk (4), is flowed back into the casting ladle (7) of pressurising room (5) by stalk (4), completion pair
The recycling of molten metal in each upright casting road (13) and stalk (4).
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| CN201811120298.4A CN108941513A (en) | 2018-09-26 | 2018-09-26 | Metallic pressure conveys shell moulded casting method |
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| CN201811120298.4A Pending CN108941513A (en) | 2018-09-26 | 2018-09-26 | Metallic pressure conveys shell moulded casting method |
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| CN109530612A (en) * | 2018-12-31 | 2019-03-29 | 兴化市剑达铸造有限公司 | A kind of lost foam casting process suitable for large and medium-sized product |
| CN112238217A (en) * | 2019-07-16 | 2021-01-19 | 吴政宽 | Molten soup forging method of thin shell mold |
| CN113441697A (en) * | 2021-06-24 | 2021-09-28 | 深圳市宝田精工科技有限公司 | Die casting method for improving vacuum degree of casting cavity |
| CN113770323A (en) * | 2021-08-19 | 2021-12-10 | 河北钢研德凯科技有限公司 | Runner design method of centrifugal pouring system of casing castings |
| CN114682766A (en) * | 2022-03-16 | 2022-07-01 | 南京工业大学 | Claw-shaped circumferential equally-divided pouring system and pouring method for aluminum alloy shell |
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| CN114682766A (en) * | 2022-03-16 | 2022-07-01 | 南京工业大学 | Claw-shaped circumferential equally-divided pouring system and pouring method for aluminum alloy shell |
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Application publication date: 20181207 |