CN106001418A - Exhaust device for casting and manufacturing method of exhaust device - Google Patents
Exhaust device for casting and manufacturing method of exhaust device Download PDFInfo
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- CN106001418A CN106001418A CN201610575659.9A CN201610575659A CN106001418A CN 106001418 A CN106001418 A CN 106001418A CN 201610575659 A CN201610575659 A CN 201610575659A CN 106001418 A CN106001418 A CN 106001418A
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- cell structure
- exhaust apparatus
- casting
- sand mold
- sand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses an exhaust device for casting and a manufacturing method of the exhaust device. The exhaust device comprises a porous structural body buried in a sand mold and made from a granular refractory material; particles of the refractory material are bonded through an adhesion agent; and gas discharging channels and exhaust holes which are all irregular in hole diameter are formed after accumulation of the particles of the refractory material. The exhaust device for casting and the tail end of a steel pipe are pre-buried in the sand mold in advance, then the steel pipe is drawn out, the exhaust holes are formed in the sand mold, operation is easy and convenient, shakeout can be effectively blocked, and the proportion of the sand inclusion defect of the casting surface caused by shakeout is substantially reduced. During casting, gas generated in a mold cavity can be smoothly discharged through the gas discharging channels of the porous structural body, and the occurrence possibility of pores and incomplete mold filling of a casting is reduced. After the gas in a casting mold is discharged, molten liquid cannot flow out of the exhaust holes because of blocking of the porous structural body, and the machining procedure of subsequent cutting on the portion is reduced.
Description
Technical field
The present invention relates to casting technology field, be specifically related to a kind of casting exhaust apparatus and this device producing method.
Background technology
In casting process, whether sand casting or other types casting, aerofluxus is all to need to consider.Its gas source mainly has: the gas having in (a) die cavity itself；B, during () casting, binding agent runs into high-temperature liquid metal volatilization and produces a large amount of gases；C in () molding sand, moisture vaporizes the substantial amounts of steam of generation under high temperature action；The gas being involved in molten metal during (d) casting.If aerofluxus is smooth, fire of choking in casting process, causes the splashing of aluminium alloy, pressure in casting mold can be increased, cause molten metal constricted flow, foundry goods to produce the casting flaw such as substantial amounts of pore and misrun.
At present, in sand casting, main exhaust technological measure is mainly at casting mold upper surface design technology steam vent, is directly connected to die cavity and air, when arranging steam vent, in order to prevent the sand on aerofluxus hole wall from dropping, need to use steel pipe, earthenware or glass tubing etc. to be embedded in sand mold.And in the actual batch production of foundry, general casting mold is not to pour into a mould simultaneously, some needs every other day or are poured into a mould every class, loose sand is easy to fall into die cavity and causes foundry goods burning into sand defect, and after casting, molten metal can enter steam vent, and the part metals entering steam vent needs polishing cleaning after solidification.
CN
104384445A provides a kind of vent structure, and this steam vent is divided into the parts such as main exhaust section, changeover portion, top vent end, sand nest, solves loose sand and directly fall into the shortcoming of die cavity, decrease the burning into sand defect of foundry goods.
This exhaust structure can effectively solve current loose sand and easily fall into die cavity, but has following shortcoming: (a) structure is more complicated, cumbersome when making；B, after () casting, molten metal is easily accessible steam vent, need to increase the operation such as cutting at this position in the later stage；C () reduces yield rate.
CN
104801666A provides a kind of casting mould exhaust apparatus, including workbench, including shaping box, sand mo(u)ld, gate spool, steam vent, connecting tube, cylinder mounting seat, cylinder, evacuate cylinder mounting seat, evacuate cylinder, cooling water pipe, compared with prior art, at metal hydraulic while gate spool enters sand mo(u)ld die cavity, cylinder band evacuates the piston in cylinder and turns right motion, air in sand mo(u)ld die cavity is extracted out, can make sand mo(u)ld die cavity is in vacuum state, thus avoid air and penetrate in metal liquid, ensure that the quality of cast member, and the flowing velocity of metal liquid can be increased, under the effect of cooling water pipe, molten metal physical ability is quickly cooled down, improve casting efficiency, this apparatus structure is simple, casting efficiency can be increased, ensure that castability.
This scenario-frame is complicated, and cost of manufacture is high, and complex operation, exploitativeness is poor.
CN
101612646B provides a kind of air release plates and the production method of clean foundry goods, its air release plates includes one piece of refractory fiber cloth/felt and the support fixing this refractory fiber cloth/felt being made up of refractory material or precoated sand, the material of described refractory fiber cloth/felt is carbon fiber, high silica fiber and/or alumina silicate fibre, described support is hollow tube-shape support, described refractory fiber cloth/felt is fixed on the one or both ends of tubular, the barrel of described tubular support uses pore space structure, refractory fiber cloth/felt enclose and form.
A kind of hollow tube-shape support of this air release plates and one layer of refractory fiber cloth/felt are constituted, and the material of hollow tube-shape support is refractory material or precoated sand composition.Its shortcoming is that the technique of molding hollow stent is cumbersome, needs complicated mould and complicated processing technology.
Summary of the invention
The present invention is in order to overcome the deficiency of above technology, it is provided that a kind of simple in construction, easy to use, minimizing subsequent processing operations, the casting exhaust apparatus improving foundry goods yield rate and this device producing method.
The present invention overcomes its technical problem be the technical scheme is that
A kind of casting exhaust apparatus, including: cell structure, it is embedded in sand mold, it is made up of granular refractory material, bondd by binding agent between granule and the granule of refractory material, after the particle packing of refractory material, form the irregular gas outlet channels in aperture；And exhaust apparatus, it is arranged in sand mold and is connected with cell structure, and exhaust apparatus will be discharged to the outside in environment through gas outlet channels expellant gas or store.
Above-mentioned exhaust apparatus is steam vent, and it is arranged in sand mold, and its tail end is connected with cell structure, and its head end turns on external environment condition.
In order to arrange be applicable to limited space the sand mold of steam vent, above-mentioned exhaust apparatus is to be arranged at the airtight air storing cavity within cell structure.
Above-mentioned refractory material is foundry quartz sand.
The granule of above-mentioned refractory material is spherical or near-spherical.
For smooth in exhaust, the granule external diameter of above-mentioned refractory material is more than or equal to 0.3mm.
Above-mentioned bonding agent is organic adhesive or inorganic adhesive.
In order to prevent molten metal from entering in the gas outlet channels in cell structure, also include refractory fiber floor, it is embedded in sand mold, and between foundry goods and cell structure, refractory fiber floor medial surface coincides with the cavity surface of sand mold, metal liquid is intercepted by described refractory fiber floor, and the gas that casting produces is discharged by refractory fiber floor.
In order to make to be inconvenient to arrange the position aerofluxus of vent, also including being embedded in some exhaust apparatus in sand mold, described exhaust apparatus is made up of cell structure, and described cell structure is internally provided with airtight air storing cavity.
A kind of method 1 of the casting exhaust apparatus described in manufacturing claims 1:
A) quartz sand and cold box resin that ratio is 100:1-2 are added mixing 1-2 minute in puddle mixer；
B) pour the mixture in model, utilize triethylamine curing and demolding, make cell structure；
C) when making sand mold, the two is embedded in sand mold, extracts out afterwards in steel pipe makes sand mold and form the steam vent being connected with cell structure.
In order to prevent molten metal from entering in the gas outlet channels in cell structure, the surface-coated waterglass of the cell structure that step b) is made, the refractory fiber paper of layer thickness 1-3mm is sticked to loose structure surface, forms the refractory fiber floor being fixed on cell structure after drying.
A kind of method 2 of the casting exhaust apparatus described in manufacturing claims 1,
A) by ceramic powder that mass fraction is 19, the binding agent of 1-9, the refractory particle mix homogeneously of 70 95；
B) pour the mixture in model, be heated to 100-200 DEG C dry 30-60 minute；
C) dried mixture demoulding post-heating is made cell structure to 1200-1550 DEG C of sintering；
D) when making sand mold, the two is embedded in sand mold, in sand mold, makes the exhaust apparatus being connected with cell structure afterwards.
In order to prevent molten metal from entering in the gas outlet channels in cell structure, the surface-coated waterglass of the cell structure that step c) is made, the refractory fiber paper of layer thickness 1-3mm is sticked to loose structure surface, forms the refractory fiber floor being fixed on cell structure after drying.
The invention has the beneficial effects as follows: in advance this casting exhaust apparatus is embedded in sand mold together with the tail end of steel pipe, extract steel pipe afterwards out, in sand mold, form steam vent, easy and simple to handle, can effectively stop knockout, the ratio of the cast(ing) surface burning into sand defect that because of knockout cause is greatly decreased.The gas produced in die cavity when pouring can smoothly pass over each gas outlet channels of cell structure and discharge, and decreases foundry goods and pore occurs and fill the occurrence probability of the incomplete defect of type.And after the gas in casting mold is discharged, molten metal is due to the stop of cell structure, it is impossible to flowed out by steam vent, decreases the follow-up manufacturing procedure to this part cutting, improve product yield.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of casting exhaust apparatus of the present invention；
Fig. 2 is the exhaust apparatus cross-sectional view in casting exhaust apparatus of the present invention；
In figure, 1. foundry goods 2. sand mold 3. refractory fiber floor 4. cell structure 5. steam vent 6. air storing cavity.
Detailed description of the invention
Below in conjunction with the accompanying drawings 1, the present invention will be further described for accompanying drawing 2.
A kind of casting exhaust apparatus, including: cell structure 4, it is embedded in sand mold 2, it is made up of granular refractory material, bondd by binding agent between granule and the granule of refractory material, after the particle packing of refractory material, form the irregular gas outlet channels in aperture；Exhaust apparatus, it is arranged in sand mold 2 and is connected with cell structure 4, and exhaust apparatus will be discharged to the outside in environment through gas outlet channels expellant gas or store.In advance this casting exhaust apparatus is embedded in sand mold 2, and exhaust apparatus is set, easy and simple to handle.The gas produced in die cavity when pouring can smoothly pass over each gas outlet channels of cell structure 4 and be discharged at exhaust apparatus, decreases foundry goods and pore occurs and fill the occurrence probability of the incomplete defect of type.And after the gas in casting mold is discharged, molten metal is due to the stop of cell structure 4, it is impossible to flowed out by steam vent, decreases the follow-up manufacturing procedure to this part cutting, improve product yield.
Exhaust apparatus can be steam vent 5, and it is arranged in sand mold 2, and its tail end is connected with cell structure 4, and its head end turns on external environment condition.In advance casting exhaust apparatus is embedded in sand mold together with one end of steel pipe, extracts steel pipe out, form steam vent 5, can effectively stop knockout, the ratio of the cast(ing) surface burning into sand defect that because of knockout cause is greatly decreased.Gas is discharged to the outside in environment by steam vent 5.Exhaust apparatus can also be for be arranged at the airtight air storing cavity 6 within cell structure 4, for complicated foundry goods, the making of itself casting mold bothers the most very much, local needs the place of aerofluxus to have a lot, if each position arranges steam vent 5, bring the biggest trouble will to the making of casting mold, some place is even limited because of casting mold structure, vent cannot be set, air storing cavity 6 can store gas, it is arranged on casting mold and needs the place of aerofluxus to introduce a gas into air storing cavity 6, steam vent 5 need not be set.
Further, it is also possible to include refractory fiber floor 3, it is embedded in sand mold 2, and between foundry goods 1 and cell structure 4, refractory fiber floor 3 medial surface coincides with the cavity surface of sand mold 2, and metal liquid is intercepted by described refractory fiber floor 3, and the gas that casting produces is discharged by refractory fiber floor 3.Refractory fiber floor 3 can improve about the obstruct to molten metal further, thus further increases product yield.
Refractory material can be foundry quartz sand, the granule of refractory material is spherical or near-spherical, its granule external diameter is more than or equal to 0.3mm, and the aperture that granule external diameter can meet the irregular gas outlet channels between granule more than or equal to 0.3mm is sufficient for the smoothness that gas is discharged.
Bonding agent can be organic adhesive or inorganic adhesive.Organic binder bond includes cold box resin, phenolic resin, furane resins or epoxy resin.Inorganic binder comprises one or more in waterglass, aluminium dihydrogen phosphate, Ludox, Alumina gel, zirconium colloidal sol, it is also possible to be mixed to prepare by one or more in waterglass, Ludox, Alumina gel, zirconium colloidal sol and refractory powder.
Refractory powder composition includes one or more in aluminium oxide, silicon oxide, zirconium oxide.
The casting exhaust apparatus of the present invention can be adopted and make with the following method:
A) quartz sand and cold box resin that ratio is 100:1-2 are added mixing 1-2 minute in puddle mixer；
B) pour the mixture in model, utilize triethylamine curing and demolding, make cell structure 4；
C) cell structure 4 and steel pipe tail end are fixed, when making sand mold 2, the two is embedded in sand mold 2, in sand mold 2, makes the exhaust apparatus being connected with cell structure 4 afterwards.This method is simple to manufacture, but when pouring, cold box resin is it may happen that aoxidize, the cold box resin intensity step-down after oxidation, thus causes foundry goods scab.
Further, the surface-coated waterglass of the cell structure 4 that step b) is made, the refractory fiber paper of layer thickness 1-3mm is sticked to cell structure 4 surface, forms the refractory fiber floor 3 being fixed on cell structure 4 after drying.
The casting exhaust apparatus of the present invention can also use following another kind of method to make,
A) by ceramic powder that mass fraction is 19, the binding agent of 1-9, the refractory particle mix homogeneously of 70 95；
B) pour the mixture in model, be heated to 100-200 DEG C dry 30-60 minute；
C) dried mixture demoulding post-heating is made cell structure 4 to 1200-1550 DEG C of sintering；
D) cell structure 4 and steel pipe tail end are fixed, when making sand mold 2, the two is embedded in sand mold 2, in sand mold 2, makes the exhaust apparatus being connected with cell structure 4 afterwards.The cell structure 4 that this method is made is owing to being formed after sintering, and therefore manufacturing cost is high, but intensity is high, and using effect is good, is not susceptible to foundry goods scab.Ceramic powder is one or more in schmigel, alumina powder, zirconia powder, zirconium silicate powder, mullite powder, clay, silicon powder, pyrophillite, wollastonite, kyanite, sillimanite, spinelle, andalusite or olivine.Binding agent can be one or more in waterglass, Ludox, Alumina gel, zirconium colloidal sol, aluminum phosphate, aluminium dihydrogen phosphate.Refractory particle can include one or more in corundum, mullite, fused alumina zirconia, zirconium mullite, zircon sand, silica sand.
Further, the surface-coated waterglass of the cell structure 4 that step c) is made or Ludox, the refractory fiber paper of layer thickness 1-3mm is sticked to cell structure 4 surface, forms the refractory fiber floor 3 being fixed on cell structure 4 after drying.
Claims (10)
1. a casting exhaust apparatus, it is characterised in that including:
Cell structure (4), is embedded in sand mold (2), and it is made up of granular refractory material, is bondd by binding agent between granule and the granule of refractory material, forms the irregular gas outlet channels in aperture after the particle packing of refractory material；And
Exhaust apparatus, it is arranged in sand mold (2) and is connected with cell structure (4), and exhaust apparatus will be discharged to the outside in environment through gas outlet channels expellant gas or store.
Casting exhaust apparatus the most according to claim 1, it is characterised in that: described exhaust apparatus is steam vent (5), and it is arranged in sand mold (2), and its tail end is connected with cell structure (4), and its head end turns on external environment condition.
Casting exhaust apparatus the most according to claim 1, it is characterised in that: described exhaust apparatus is to be arranged at the airtight air storing cavity (6) that cell structure (4) is internal.
Casting exhaust apparatus the most according to claim 1, it is characterised in that: described refractory material is foundry quartz sand, and the granule of refractory material is spherical or near-spherical, and the granule external diameter of described refractory material is more than or equal to 0.3mm.
Casting exhaust apparatus the most according to claim 1, it is characterised in that: described bonding agent is organic adhesive or inorganic adhesive.
6. according to the casting exhaust apparatus described in claim 1 to 5 any one, it is characterized in that: also include refractory fiber floor (3), it is embedded in sand mold (2), and be positioned between foundry goods (1) and cell structure (4), refractory fiber floor (3) medial surface coincides with the cavity surface of sand mold (2), metal liquid is intercepted by described refractory fiber floor (3), and the gas that casting produces is discharged by refractory fiber floor (3).
7. the method for casting exhaust apparatus described in any one in a manufacturing claims 1 to 6, it is characterised in that:
A) quartz sand and cold box resin that ratio is 100:1-2 are added mixing 1-2 minute in puddle mixer；
B) pour the mixture in model, utilize triethylamine curing and demolding, make cell structure (4)；
C) when making sand mold (2), the two is embedded in sand mold (2), in sand mold (2), makes the exhaust apparatus being connected with cell structure (4) afterwards.
The manufacture method of casting exhaust apparatus the most according to claim 8, it is characterized in that: the surface-coated waterglass of the cell structure (4) that step b) is made or Ludox, the refractory fiber paper of layer thickness 1-3mm is sticked to cell structure (4) surface, forms the refractory fiber floor (3) being fixed on cell structure (4) after drying.
9. the method for the casting exhaust apparatus described in a manufacturing claims 1, it is characterised in that:
A) by ceramic powder that mass fraction is 19, the binding agent of 1-9, the refractory particle mix homogeneously of 70 95；
B) pour the mixture in model, be heated to 100-200 DEG C dry 30-60 minute；
C) dried mixture demoulding post-heating is made cell structure (4) to 1200-1550 DEG C of sintering；
D) cell structure (4) and steel pipe tail end are fixed, when making sand mold (2), the two is embedded in sand mold (2), in sand mold (2), make the exhaust apparatus being connected with cell structure (4) afterwards.
The manufacture method of casting exhaust apparatus the most according to claim 8, it is characterized in that: the surface-coated waterglass of the cell structure (4) that step c) is made or Ludox, the refractory fiber paper of layer thickness 1-3mm is sticked to cell structure (4) surface, forms the refractory fiber floor (3) being fixed on cell structure (4) after drying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610575659.9A CN106001418B (en) | 2016-07-21 | 2016-07-21 | A kind of casting exhaust apparatus and the device producing method |
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| CN201610575659.9A CN106001418B (en) | 2016-07-21 | 2016-07-21 | A kind of casting exhaust apparatus and the device producing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20220048104A1 (en) * | 2020-08-13 | 2022-02-17 | Qingyou Han | Controlled nozzle cooling (cnc) casting |
| CN114953367A (en) * | 2022-05-09 | 2022-08-30 | 登高电气有限公司 | Mixed epoxy vacuum pouring device in mutual inductor mould |
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| CN114953367B (en) * | 2022-05-09 | 2023-01-20 | 登高电气有限公司 | Mixed epoxy vacuum pouring device in mutual inductor mould |
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| Publication number | Publication date |
|---|---|
| CN106001418B (en) | 2018-05-25 |
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