CN102335723B - Negative pressure casting molding method for thin-wall structure - Google Patents
Negative pressure casting molding method for thin-wall structure Download PDFInfo
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- CN102335723B CN102335723B CN201110336258.5A CN201110336258A CN102335723B CN 102335723 B CN102335723 B CN 102335723B CN 201110336258 A CN201110336258 A CN 201110336258A CN 102335723 B CN102335723 B CN 102335723B
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Abstract
null" negative pressure casting molding method for thin-wall structure " of the present invention includes the housing part negative pressure casting molding of complicated inner cavity structure，The foamed plastic parts identical with foundry goods material object geometric shape is coated on built-in hollow shell structure core outer surface type and becomes basic casting mold reduced proper motion technique，Use built-in hollow shell structure core and independent vacuum source、Compressed gas source is connected，Can be as desired by the built-in reliable vacuum exhaust of hollow shell structure core、Keep malleation、It is passed through beneficial gas，Regulate built-in hollow shell structure core pressure，Temperature、Other physical chemical characteristic，It is able to maintain that sand mold stably ensures that casting mold completely improves inherent quality，Built-in hollow shell structure core is passed through compressed air and can crush core and realize automatic sand removal，More than 50% moulding sand removal technological process can be simplified，Reduce more than half production operation plant area，Investment reduction and production cost.
Description
One, technical field is related to:
The one " negative pressure casting molding method for thin-wall structure " of the present invention relates to thin-wall construction negative pressure casting
Molding.Ripe negative pressure casting forming method is V method and lost foam, and its advantage is to casting model powder material evacuation
Forming pressure reduction, sand material is the most extruded, simplifies molding and sand removal operation, reduces harmful gas infringement
Casting quality.V method negative pressure casting is achieved in that prefabricated mock-up, model full mold surface have vacuum gas
Intercommunicating pore is connected with vacuum system, lays plastic sheeting in full mold surface vacuum suction force range, and thin film is backed with and adds
Film heating is softened by thermal, and under vac sorb, thin film covers mock-up, forms thin film full mold after cooling,
Thin film full mold is placed in the sandbox connected with vacuum system, and after evacuation, sand mold is formed and thin film full mold under differential pressure
Identical type shape, keeps vacuum state, pours into a mould after two sandbox para-position mould assembling, and after workpiece cooling molding, release is true
Sky, sand mold is the most defeated and dispersed, and lost foam negative pressure casting first makes a plastic foam full mold, and plastic foam is real
The sandbox connected with vacuum system put into by type, and after evacuation, sand mold is squeezed into the sand of certain rigidity under differential pressure
Core, completes casting, it can be seen that V method and lost foam are all to be all to take out sandbox very under keeping vacuum state
The empty pressure reduction extruding sand mold that formed is formed with the casting mold cavity of certain rigidity, and keeping mo(U)ld face differential pressure balancing is part
The key of the complete molding of geometry, to outside surface forming the most reliably the most at present, but has closing, half envelope
The parts of Casting molding closing cavity shell structure still needs to use interior subordinate's core way, conventional interior core aerofluxus without
Method solves, and internal cores needs artificial sand removal, and improvement direction is: be cast with closing, semiclosed cavity shell structure
Part when needing to arrange built-in core, internal cores is capable of that vacuum exhaust, gas is quenched and pressurization, interior
Portion's core is capable of automatic sand removal.
Two, the purpose of invention:
The foamed plastic parts identical with foundry goods material object geometric shape is coated on outside built-in hollow shell structure core
Surface forms basic casting mold reduced proper motion technique, uses built-in hollow shell structure core and independent vacuum source compressed gas
Source is connected, and malleation can be kept to be passed through QI invigorating as desired by the built-in reliable vacuum exhaust of hollow shell structure core
Body regulates built-in hollow shell structure core pressure and temp other physical chemical change characteristic, it is possible to maintain sand mold stably to protect
Hold casting mold and completely improve inherent quality.Built-in hollow shell structure core is passed through compressed gas can crush core realization certainly
Dynamic sand removal.
Three, the method realizing invention:
" negative pressure casting molding method for thin-wall structure " of the present invention is achieved in that real with foundry goods
The full mold foam plastics full mold part that thing geometric shape is identical is coated on profile and foundry goods material object inner chamber geometric shape
Identical built-in hollow shell structure core and outer surface form basic casting mold, the inner core of built-in hollow shell structure core wall
Exhaust joint connects formation inner chamber gas by Thermostable flexible hose through controlling valve and independent vacuum source compressed gas source
Body pressure regulating system, inserts the basic casting mold connected with inner chamber gas pressure regulating system and is connected with vacuum source
Sandbox in constitute thin-wall construction negative pressure casting system, thin-wall construction negative pressure casting system takes realization to pass through inner chamber
Gas pressure regulation system realizes regulating built-in hollow shell structure core pressure, temperature, other physical chemical characteristic
Measure ensures that casting geometric molding is complete, reduces harmful gas to inherent quality harmful effect, these function measures
It is: built-in core outer surface geometry character overlaps with foundry goods material object cavity shape, and built-in core is to have through inside
The hollow shell structure in space, built-in hollow shell structure core wall uniform inner core vacuum pumping hole, the true footpath of vacuum pumping hole
0.5-10MM, built-in hollow shell structure core wall has the inner core exhaust joint can be with outside independent vacuum source and compression
Gas source connects, the foamed plastic parts identical with foundry goods material object geometric shape in it at surface geometry type shape with interior
It is empty shell structure core outside wall surface to overlap, foamed plastic parts is cutd open into two or more half mould part, symmetrical shape
Subdivision profile is used mirror to die joint by foamed plastic parts, and foamed plastic parts surfaces externally and internally applies high temperature insulating and is coated with
Material, is coated on the half mould foamed plastic parts cutd open built-in hollow shell structure core outer surface and forms basic casting mold
After, the inner core exhaust joint of built-in hollow shell structure core wall by Thermostable flexible hose through control valve simultaneously with solely
Vertical vacuum source, compressed gas source connection type becomes inner chamber gas pressure regulating system, can be as desired by inner chamber
The gas pressure regulation reliable vacuum exhaust of system keeps malleation, is passed through beneficial gas, regulates built-in hollow shell structure sand
Core pressure and temp other physical chemical characteristic, it is possible to casting mold the most completely improves inherent matter to maintain sand mold stably to ensure
Amount, built-in hollow shell structure core is passed through compressed air and can crush core and realize automatic sand removal.Open and vacuum source
Connect control valve and produce vac sorb, vacuum exhaust at built-in hollow shell structure core wall, former by isostatic pressed
Reason keeps cast passage and sand mold vacuum, opens and connects valve at built-in hollow shell structure core wall with compressed gas source
Face produces malleation, strengthens malleation and can produce pressure destruction, is passed through beneficial gas and can regulate built-in ghost
Structure core pressure and temp other physical chemical characteristic improves mold quality, is inserted by basic casting mold with vacuum source even
Connect sandbox, first start sandbox vacuum source by casting model powder material basic casting mold outer surface formed pressure reduction be squeezed into
Type, then starts inner chamber gas extraction system, and inner chamber gas extraction system negative pressure keeps balance by valve regulated extraction flow,
Needing reliably to discharge the harmful gas of generation casting mold space, a kind of measure sends into oxidation by running channel before cast
Agent and foamed plastic parts catalytic combustion produce flue gas sequentially by high temperature insulating mould coating, built-in hollow shell structure core
Vacuum pumping hole inner chamber gas extraction system enters outside sandbox, the high temperature barrier coating on its surface after foam plastics disappearance
Film is attracted to be fitted in outside sand mold and internal cores surface forms founding materials running channel cavity, is keeping vacuum
Under start cast, another kind of measure in cast simultaneously, allows high temperature mould material gasify ablation foam plastics, produces
Flue gas is sequentially by high temperature barrier coating, and built-in hollow shell structure core vacuum pumping hole, inner chamber gas extraction system enters
Outside sandbox, under keeping vacuum, start cast, by built-in hollow shell structure core inner chamber gas pressure during cast
It is favourable, by built-in hollow shell structure core inner chamber gas to improving casting quality that regulation system sends into protective gas
It is favourable to improving casting quality that pressure regulating system sends into high temperature protection gas, discharges after workpiece cooling molding
Vacuum, outside sand mold is defeated and dispersed.Built-in hollow shell structure core input compressed gas, built-in ghost is tied by gas pressure
Structure crushing realizes automatic sand removal.
Four, the positive effect carried out an invention:
V method and lost foam have dependence evacuation and sand material are produced the extruded effect of pressure reduction, permissible
Release vacuum realizes the automatic defeated and dispersed sand removal of sand mold, and the advantage that can be realized aerofluxus by sand mold, sand mold has elasticity
Foundry goods can be reduced expand with heat and contract with cold the casting flaw that stress causes, but easily occur that the pressure reduction that fluctuations of vacuum causes squeezes
The pressure the most defeated and dispersed casting mold geometrical defect that causes of effect disappearance sand mold, sand mold exhaust resistance be difficult to greatly to discharge gas in
Only, it is used for having complex internal cavity structure casting mold to be difficult to ensure that inherence and external quality, internal cores is installed and still needs to
Artificial sand removal.The present invention on the basis of keeping V method and lost foam advantage, built-in hollow shell structure core wall
Inner core exhaust joint by heat-resisting soft pipe joint through control valve respectively with independent vacuum source；Compressed gas source connects
Logical, form inner chamber gas pressure regulating system, can be as desired by the built-in reliable vacuum of hollow shell structure core
Aerofluxus, keeps malleation, is passed through beneficial gas, regulates built-in hollow shell structure core pressure, temperature, other physical
Chemical characteristic, it is possible to maintaining sand mold stably to ensure that casting mold completely improves inherent quality, built-in hollow shell structure core is defeated
Enter compressed gas to crush core and realize automatic sand removal, more than 50% moulding sand removal technological process can be simplified,
Reduce more than half production operation plant area, investment reduction and production cost.
Five, drawings and Examples are combined to the present invention " negative pressure casting molding method for thin-wall structure " explanation
As follows:
Fig. 1 is to use " negative pressure casting molding method for thin-wall structure " Foundry Production railway locomotive steering side
Frame embodiment schematic diagram
In Fig. 1: compressed gas source, 2 independent vacuum sources, 3 full mold foamed plastic parts, it is empty in 4
Shell structure core, 5 inner core vacuum pumping holes, 6 inner core exhaust joints.
The invention will be further described for interengaging embodiment: railway locomotive steering is typically to have half envelope
Close the cast steel structure part of cavity structure, use the inventive method to produce side frame and be achieved in that according to side frame real
Type surface of internal cavity type shape makes built-in hollow shell structure core, built-in hollow shell structure core outer surface geometric shape and casting
In part material object, lumen type shape overlaps, the built-in hollow shell structure uniform vacuum pumping hole of core wall, vacuum suction bore dia
0.5-10MM, built-in hollow shell structure core wall has inner core exhaust joint and outside independent vacuum system and compressed gas
System system connects, and makes the foamed plastic parts identical with side frame foundry goods full mold, its inner surface geometric shape simultaneously
Overlap with built-in hollow shell structure core outside wall surface, be two half mould parts by foamed plastic parts to cuing open, foam plastic
Material part surfaces externally and internally applies high temperature barrier coating, and two half mould foamed plastic parts are coated on built-in hollow shell structure
Core outer surface forms basic casting mold, is fixed on the inner core exhaust joint of built-in hollow shell structure core wall by resistance to
High temperature hose is adjusted with outside independent vacuum source and compressed gas source connection formation inner chamber gas pressure through controlling valve
Joint system, basic casting mold is inserted be connected with independent vacuum system sandbox, first start sandbox vacuum system real
Existing casting model powder material is extruded at basic casting mold outer surface pressure reduction, then starts inner chamber gas extraction system, inner chamber aerofluxus
The negative pressure of system and basic mo(U)ld face negative pressure keep balance by valve regulated extraction flow, send into oxidant with
Foamed plastic parts catalytic combustion, produces flue gas sequentially true by high temperature barrier coating, built-in hollow shell structure core
Empty aspirating hole, inner core exhaust joint, enter outside sandbox through exhaustor, burns its surface after foam plastics
High temperature isolation barrier coating film is adsorbed being fitted in outside sand mold and internal cores outer surface forms founding materials and waters
Road cavity, starts to pour into a mould side frame, by built-in hollow shell structure core inner chamber gas pressure during cast under keeping vacuum
It is favourable to improving casting quality that protective gas sent into by draught control system, and after the cooling molding of side frame workpiece, release is true
Sky, outside sand mold is defeated and dispersed, is inwardly empty shell structure core and is passed through compressed air, and built-in ghost is tied by gas pressure
Structure core crushes, it is achieved sand removal automatically.
Claims (8)
1. a negative pressure casting molding method for thin-wall structure, it is characterised in that the full mold foam plastics full mold part identical with foundry goods material object geometry is coated on profile and foundry goods material object inner chamber geometry
The built-in hollow shell structure core that shape is identical forms basic casting mold with outer surface, the inner core exhaust joint of built-in hollow shell structure core wall connects formation inner chamber gas pressure regulating system by Thermostable flexible hose through controlling valve and independent vacuum source compressed gas source, thin-wall construction negative pressure casting system is constituted in the basic casting mold connected with inner chamber gas pressure regulating system is inserted the sandbox being connected with vacuum source, thin-wall construction negative pressure casting system is taked to realize realizing regulating built-in hollow shell structure core pressure by inner chamber gas pressure regulating system, temperature, the measure of other physical chemical characteristic ensures that casting geometric molding completely reduces harmful gas to inherent quality harmful effect, built-in hollow shell structure core input compressed air, core can be crushed and realize automatic sand removal.
Negative pressure casting molding method for thin-wall structure the most according to claim 1, it is characterized in that: its inner surface geometry of the in kind foamed plastic parts identical with foundry goods material object geometry overlaps with built-in hollow shell structure core outer wall, by foamed plastic parts to cuing open as two or more half mould part, subdivision profile is used mirror to apply high temperature insulating mould coating to die joint, foamed plastic parts surfaces externally and internally by symmetrical shape foamed plastic parts.
Negative pressure casting molding method for thin-wall structure the most according to claim 1, it is characterized in that: built-in hollow shell structure core outer surface geometry overlaps with core cavity shape, built-in core is the hollow shell structure having through inner space, built-in hollow shell structure core wall uniform inner core vacuum pumping opening, vacuum pumping opening diameter 0.5-10 millimeter, built-in hollow shell structure core wall has inner core exhaust joint to be connected with compressed gas source with outside independent vacuum source.
Negative pressure casting molding method for thin-wall structure the most according to claim 1, it is characterized in that: inner chamber gas pressure regulating system is opened to connect with vacuum source and controlled valve at built-in hollow shell structure core wall generation vac sorb, vacuum exhaust, the fine pressure principle such as passing through keeps casting runner and sand shape vacuum to maintain sand shape stable, open and connect valve in built-in hollow shell structure core wall generation malleation with compressed gas source, strengthen malleation and be internally empty the generation pressure destruction of shell structure core, it is passed through beneficial gas to realize regulating built-in hollow shell structure core pressure, temperature, other physical chemical characteristic.
Negative pressure casting molding method for thin-wall structure the most according to claim 1, it is characterized in that: reduce harmful gas to inherent quality harmful effect, a kind of measure is sent into oxidant by running channel before cast and is sequentially passed through high temperature insulating mould coating with foamed plastic parts catalytic combustion generation flue gas, built-in hollow shell structure core vacuum pumping hole, inner chamber gas extraction system enters outside sandbox, after foam plastics disappearance, the high temperature barrier coating film on its surface is adsorbed is fitted in outside sand mold and internal cores surface formation founding materials running channel cavity, cast is started under keeping vacuum, another kind of measure allows high temperature mould material gasify disappearance foam plastics in cast simultaneously, produce flue gas sequentially by high temperature barrier coating, built-in hollow shell structure core vacuum pumping hole, inner chamber gas extraction system enters outside sandbox, cast is started under keeping vacuum.
Negative pressure casting molding method for thin-wall structure the most according to claim 1, it is characterised in that: send into protective gas by built-in hollow shell structure core inner chamber gas pressure regulating system when being casting by the measure of the inner chamber gas pressure regulating system realization built-in hollow shell structure core other physical chemical characteristic of regulation.
Negative pressure casting molding method for thin-wall structure the most according to claim 1, it is characterised in that: the measure realizing regulating built-in hollow shell structure structure core gas temperature by inner chamber gas pressure regulating system is to send into high temperature protection gas.
Negative pressure casting molding method for thin-wall structure the most according to claim 1; it is characterized in that: the measure that protection casting geometric molding is complete is that basic casting mold is inserted the sandbox being connected with vacuum source; first start sandbox vacuum source extruded at basic casting mold outer surface formation pressure reduction by casting model powder material; then starting inner chamber gas extraction system, the negative pressure of inner chamber gas extraction system keeps balance with basic mo(U)ld face negative pressure by valve regulated extraction flow.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110336258.5A CN102335723B (en) | 2011-10-31 | 2011-10-31 | Negative pressure casting molding method for thin-wall structure |
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| CN201110336258.5A CN102335723B (en) | 2011-10-31 | 2011-10-31 | Negative pressure casting molding method for thin-wall structure |
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| CN102335723A CN102335723A (en) | 2012-02-01 |
| CN102335723B true CN102335723B (en) | 2016-09-28 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9403209B2 (en) * | 2013-01-22 | 2016-08-02 | GM Global Technology Operations LLC | Methods for sand core gas evacuation and related systems and apparatus |
| CN103878304A (en) * | 2014-03-03 | 2014-06-25 | 安徽华通铸业有限公司 | Casting process of pump valve casting |
| KR101870591B1 (en) * | 2015-01-15 | 2018-06-22 | 닛산 지도우샤 가부시키가이샤 | Low-pressure casting method and low-pressure casting apparatus |
| CN107442747B (en) * | 2017-09-20 | 2023-07-28 | 衡阳金扬冶金矿山设备有限公司 | Casting method and casting die of movable cone lining plate or fixed cone lining plate of large cone crusher |
| CN109093098B (en) * | 2018-09-12 | 2021-02-12 | 中国航发哈尔滨东安发动机有限公司 | Exhaust method for magnesium alloy complex closed core |
| CN113246428A (en) * | 2021-05-31 | 2021-08-13 | 重庆市金盾橡胶制品有限公司 | Rubber extruder capable of reducing bubbles |
| CN114749605A (en) * | 2022-04-15 | 2022-07-15 | 迅驰工业(银川)有限公司 | Exhaust structure and operation process thereof |
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Patent Citations (6)
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| DE3815828A1 (en) * | 1987-05-07 | 1988-11-17 | Metal Casting Tech | METHOD AND DEVICE FOR INCREASING POURING OF METAL UNDER AIR EXCLUSION |
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