CN116352027A - Method and die for preparing sand mold by air blowing curing method - Google Patents
Method and die for preparing sand mold by air blowing curing method Download PDFInfo
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- CN116352027A CN116352027A CN202111622437.5A CN202111622437A CN116352027A CN 116352027 A CN116352027 A CN 116352027A CN 202111622437 A CN202111622437 A CN 202111622437A CN 116352027 A CN116352027 A CN 116352027A
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- 239000004576 sand Substances 0.000 title claims abstract description 134
- 238000007664 blowing Methods 0.000 title claims abstract description 67
- 238000001723 curing Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 35
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 31
- 239000002694 phosphate binding agent Substances 0.000 claims abstract description 21
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 17
- 238000007711 solidification Methods 0.000 claims abstract description 13
- 230000008023 solidification Effects 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 244000035744 Hura crepitans Species 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 abstract description 4
- 239000010452 phosphate Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 21
- 238000005303 weighing Methods 0.000 description 13
- 238000011049 filling Methods 0.000 description 8
- 239000002313 adhesive film Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 7
- 239000000428 dust Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000003110 molding sand Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000002627 tracheal intubation Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
- B22C9/123—Gas-hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/185—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents containing phosphates, phosphoric acids or its derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
-
- 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)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The application discloses a method and a die for preparing a sand mold by an air blowing curing method, comprising the following steps: sequentially mixing superfine fused magnesia powder, a silane coupling agent and a phosphate binder with raw sand to prepare a sand mold; wherein, the sand mould is prepared by adopting an air blowing solidification method; the air blowing solidification method adopts a die with a conical air blowing pipe with holes inside. The compressed air is sent into the sand mold by using the channels such as the conical pipe with the holes and the pattern blowholes, and the moisture contained in the sand mold is taken away when overflowed, so that the integral curing speed of the phosphate bonded sand mold is improved, and the technical problems of low curing speed, hard and impermeable sand mold in actual production are solved.
Description
Technical Field
The application relates to the technical field of molding materials in the casting industry, in particular to a method and a die for preparing a sand mold by an air blowing curing method.
Background
The foundry industry is a high energy consumption and high pollution industry. At present, the foundry industry yield in China is first in the world, but pollution control technology, facilities and the like are relatively backward, the emission of three wastes is ten times as much as that in some industrially developed countries, and a great part of waste gas pollution is caused by pyrolysis of organic resin binders.
The phosphate binder is a green and environment-friendly casting inorganic binder, has the advantages of small gas generation amount, good high-temperature collapsibility, simple old sand regeneration process, good effect and the like, and has great application value and prospect. However, the problems of poor moisture absorption resistance, lack of a proper curing method for a larger sand mold, low curing speed and the like severely limit the application of the resin in casting production.
The magnesia powder is a traditional alkali metal curing agent, and the pure use of the magnesia powder curing agent requires a considerable addition amount to enable the sand mold to be demolded in a short time, and the problem caused by excessive addition amount is that the strength stability of the sand mold in the storage process is reduced. Part of the curing mechanism of the magnesite powder curing agent is to increase the total neutralization degree (the ratio of basic oxide to phosphate binder anhydride) so that the system is quickly supersaturated, and the evaporation effect of moisture is larger than the condensation effect, so that the magnesite powder curing agent is further dehydrated and cured. However, for thicker sand molds, there is substantially no air flow within the mold, and the adhesive film has too slow a rate of evaporation of moisture, which affects further curing within the mold.
Disclosure of Invention
In order to solve the defects in the art, the application provides a method for preparing a sand mold by an air blowing curing method and a mold.
According to one aspect of the present application, a method for preparing a sand mold by a blown air curing process includes: sequentially mixing superfine fused magnesia powder, a silane coupling agent and a phosphate binder with raw sand to prepare a sand mold;
wherein, the sand mould is prepared by adopting an air blowing solidification method;
the air blowing solidification method adopts a die with a conical air blowing pipe with holes inside.
According to some embodiments of the present application, the phosphate binder is added in an amount of 1.79% to 1.99% by weight of the raw sand.
According to some embodiments of the present application, the silane coupling agent is added in an amount of 3.99 to 4.99% by weight of the phosphate binder.
According to some embodiments of the present application, the ultra-fine fused magnesia powder is added in an amount of 2.99% to 4.99% by weight of the phosphate binder.
According to some embodiments of the present application, the silane coupling agent is KH-550.
According to some embodiments of the present application, the ultra-fine fused magnesia powder is 5000 mesh.
According to some embodiments of the present application, the compressed air has a temperature of 10 to 25 ℃, a humidity of 15 to 30RH, and a pressure of 0.6 to 0.8MPa.
According to another aspect of the present application, there is also provided a mold for a blown air curing method, the mold comprising: the device comprises a sand box, a core plate, a gas storage box, a porous pattern and a porous conical gas blowing pipe;
the bottom of the pattern with the air holes is a core plate;
the core plate is vertically upwards provided with a conical air blowing pipe with holes;
the core plate and the gap at the bottom of the sand box form a gas storage box;
the gas storage box is communicated with the inside of the sand box through the core plate and the conical gas blowing pipe with holes.
According to some embodiments of the application, the air storage box is provided with an air inlet.
According to some embodiments of the application, the wall of the perforated conical air blowing pipe is 1.5-2 mm in diameter, and the distance between adjacent air holes is 2-4 cm.
According to the embodiment of the application, the superfine fused magnesia powder is adopted as an auxiliary material, the total neutralization degree of the system can be effectively improved by the magnesia powder, the superfine magnesia powder is more uniformly dispersed than the conventional 325-mesh magnesia powder, and meanwhile, the fused magnesia is subjected to high-temperature treatment, so that the crystal form is regular, the defects are few, and the reaction speed is stable. A small amount of superfine fused magnesia powder participates in reaction with the adhesive film to solidify and improve the moisture absorption resistance, and meanwhile, the brittleness is not obviously increased and the strength is not obviously reduced.
The application also provides a device for blowing room temperature compressed air to solidify the phosphate binder sand mould. The method aims at using the channels such as the conical pipe with the holes and the pattern blowholes to send the compressed air into the sand mold, taking away the moisture contained in the sand mold when overflows, improving the integral curing speed of the phosphate bonded sand mold, and solving the technical problems of low curing speed, hard and impermeable sand mold in actual production and the like.
For thicker sand molds, the water in the binder is partially volatilized and diffused, but is limited in the small gaps among sand grains, so that the water cannot be diffused to the outside, and water vapor in the sand molds cannot be taken away quickly and effectively only by blowing air on the surfaces of the sand molds, so that the water vapor cannot play a decisive role in the overall solidification of the sand molds. The porous air blowing pipe and the porous mold sample inserted into the sand mold can introduce dry compressed air into the center of the sand mold, and the high-humidity water vapor in the gap is taken away from the sand mold in a gas hindered diffusion mode, so that water in the system is enabled to be condensed-evaporated to perform balanced forward movement, and the adhesive film is further dehydrated and solidified. The problems of low overall curing speed of the sand mold and incomplete curing inside the core can be effectively solved by the methods of inserting the pipe, opening the air blowing hole of the pattern and the like.
Drawings
FIG. 1 is a schematic diagram of a mold structure of an air-blown curing method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the operation of a mold for the blown air curing process according to the embodiment of the present application;
FIG. 3 is a diagram of a pattern in a flask and a blow tube layout according to an embodiment of the present application;
FIG. 4 is a diagram showing the pattern and air lock layout in a flask according to the comparative example of the present application.
Detailed Description
As described above, the prior art has the technical problems of low curing speed, hard and impermeable performance and the like of a thick and large sand mould in the casting field. In order to solve the problems, the application provides a method for preparing a sand mold by an air blowing curing method and a mold.
The following description of the embodiments of the present application will be made clearly and fully with reference to the embodiments of the present application, and it is apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It is particularly pointed out that similar substitutions and modifications made in relation to the present application will be apparent to a person skilled in the art and are all considered to be included in the present application. It will be apparent to those skilled in the relevant art that modifications and variations can be made in the methods and applications described herein, or in the appropriate variations and combinations, without departing from the spirit and scope of the application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application.
The application is carried out according to the conventional conditions or the conditions suggested by manufacturers if the specific conditions are not noted, and the raw materials or auxiliary materials and the reagents or the equipment are conventional products which can be obtained commercially if the manufacturers are not noted.
According to the technical conception of the application, a method and a die for preparing a sand mold by an air blowing curing method are provided.
The present application is described in detail below.
[ method for preparing Sand mould by blowing air curing ]
The application provides a preparation method of an air-blown curing phosphate inorganic binder sand mould (core).
Phosphate binder with neutralization degree 34 and code number B6S1M4Z3 is adopted, and the addition amount is 1.79-1.99 (accounting for sand);
adopting superfine fused magnesia powder as powder auxiliary material, the adding amount is 2.99% -4.99% (accounting for binder);
adopting a silane coupling agent KH-550 as a liquid auxiliary material, wherein the addition amount is 3.99-4.99%; and room temperature drying compressed air is blown by using a cannula method to accelerate curing.
The 34B6S1M4Z3 phosphate binder is synthesized by a laboratory in a self-made manner.
The superfine fused magnesia powder is of industrial grade.
The silane coupling agent KH-550 is of industrial grade.
The room temperature drying compressed air is the compressed air dehumidified by a athermal adsorption dryer.
The superfine fused magnesia powder is adopted, on one hand, because the fused magnesia powder is more regular than the metallurgical magnesia powder in crystal form, and the reaction speed is more stable and controllable; on the other hand, compared with the conventional 325-mesh superfine magnesia powder, the 5000-mesh superfine magnesia powder is more uniformly dispersed on the surface of the adhesive film, the required addition amount for reaching the specific curing speed is less, the reaction can be completed in a short time, and the condition that the 325-mesh magnesia powder is not uniformly distributed on the local part of the adhesive film and excessively reacts to reduce the strength is rarely caused.
The silane coupling agent functions to increase the affinity of the adhesive film to the sand surface and to increase the cohesive force of the phosphate adhesive film itself.
The method specifically comprises the following steps:
step one: and uniformly and reasonably mounting the conical air blowing pipe with the holes on the die core plate in a way of being parallel to the demolding direction. The lower part of the die core plate is sealed to form a gas storage box, a gas blowing pipe is communicated with the gas storage box (the sand mould is larger, the gas blowing pipe is more, and the die sample is also provided with a gas blowing hole, the gas storage box is provided with a gas inlet hole and is connected with a dryer, and the dryer is connected to an air compressor. Then placing the sand box on the core plate; the inlets of all the air pipes can also be connected in parallel to one main air passage (the sand mould is smaller, the air blowing pipes are fewer and the mould is applicable when no air blowing hole exists);
step two: adding auxiliary materials and a binding agent into superfine fused magnesia powder, a silane coupling agent and a phosphate binding agent in sequence, wherein each material is separated by 1.0-1.5 min, then uniformly mixing with raw sand in a sand mixer, and discharging sand after mixing for 4-5 min in total;
step three: filling molding sand into a sand box provided with the template in the first step, and compacting;
step four: the air compressor is turned on, compressed air flows into the air passage of the mould after being processed by the dryer, and after 15-30 minutes, sand hardening and demoulding (the concrete time is determined by combining the size of the sand mould) are carried out, and then the air is naturally stored for more than 2 hours.
[ die for blowing compressed air curing Process ]
The application provides a mold for blowing compressed air curing method.
Comprising the following steps: the device comprises a sand box, a core plate, a gas storage box, a porous pattern and a porous conical gas blowing pipe;
and uniformly and reasonably mounting the conical air blowing pipe with the holes on the die core plate in a way of being parallel to the demolding direction, and communicating the conical air blowing pipe with the lower air storage box. And a small number of air blowing holes are also formed in the pattern and are also communicated with the air storage box. The dry compressed air enters the air storage box and enters the sand mould through the conical air blowing pipe and the pattern with the air holes.
The lower part of the die core plate is sealed to form a gas storage box, and a gas blowing pipe is communicated with the gas storage box (the sand mould is larger, the gas blowing pipe is more, and the die is also provided with a gas blowing hole; the inlets of the air pipes can also be connected in parallel to a main air passage (the sand mould is smaller, the air blowing pipes are fewer, and the mould is applicable when no air blowing holes exist).
The air blowing pipe is a conical structure pipe, the conical pipe can avoid that the diameter of the air blowing hole on the pipe wall is 1.5-2 mm, and the distance between the adjacent air holes is 2-4 cm and the air blowing holes are uniformly distributed when the sand mold is demolded.
The present application is described in detail with reference to specific examples.
The bearing cap is selected as a test casting, the appearance maximum size of a single casting is 250 multiplied by 140 multiplied by 90mm, the net weight is 12kg, and the material is HT-200 (cast iron); the wood pattern adopts a two-piece layout of one pattern, the size of the sand box is 460 multiplied by 450 multiplied by 210mm, and the sand filling amount is 54kg.
Example 1
The raw sand is 50-100 mesh big forest standard sand, the number of inserted pipes is 3, the taper pipe is 500mm long, the diameter of the big end is 25mm, the diameter of the small end is 15mm, the sand is uniformly distributed on the side surface of the sand box from top to bottom and from left to right, the center distance of the taper pipe is 12cm, air holes are uniformly distributed on the taper pipe, and the diameter of the air holes is
The spacing is 2cm; the bottoms of all the air pipes are connected in parallel by a tee joint>
On the main air pipe.
1) Weighing 54kg of raw sand, and adding the raw sand into a roller mill;
2) 28.9g of superfine dust collection magnesia powder is weighed and added into a sand mixer, and sand is mixed for 2min;
3) 38.57g of silane coupling agent KH-550 is weighed and added into a sand mixer, and sand is mixed for 2min;
4) Weighing 966.6g of phosphate binder, adding into a sand mixer, mixing for 2min, discharging sand, filling into a barrel, and covering with wet cloth;
5) Pouring molding sand into a sand box, slightly compacting, and strickling;
6) Introducing dry compressed air (0.6 MPa,14 m) 3 /h)
7) And testing the internal solidification degree of the sand mold through steel wire cutting, ending blowing after 30min, and demolding.
Example 2
The sand mold structure and size were the same as in example 1. The raw sand is 30-50 mesh Fujian sand, the number of inserted pipes is 8, the taper pipe is 170mm long, the diameter of the big end is 25mm, the diameter of the small end is 12mm, one end of the inserted pipe is fixed on the core plate and evenly distributed around the wood pattern, the distance is 3-5 cm, air holes are evenly distributed on the taper pipe, and the diameter of the air holes is as follows
The spacing is 2cm; the bottoms of all the air pipes are connected in parallel by a tee joint>
On the main air pipe.
1) Weighing 54kg of raw sand, and adding the raw sand into a roller mill;
2) 28.9g of superfine dust collection magnesia powder is weighed and added into a sand mixer, and sand is mixed for 2min;
3) 38.57g of silane coupling agent KH-550 is weighed and added into a sand mixer, and sand is mixed for 2min;
4) Weighing 966.6g of phosphate binder, adding into a sand mixer, mixing for 2min, discharging sand, filling into a barrel, and covering with wet cloth;
5) Pouring molding sand into a sand box, slightly compacting, and strickling;
6) Introducing dry compressed air (0.6 MPa,14 m) 3 /h)；
7) And testing the solidification degree through steel wire cutting, ending blowing after 15min, and demoulding.
Example 3
The sand mold structure and size were the same as in example 1. The raw sand is 30-50 mesh Fujian sand, the number of inserted pipes is 8, the taper pipe is 170mm long, the diameter of the big end is 25mm, the diameter of the small end is 12mm, one end of the inserted pipe is fixed on the core plate and evenly distributed around the wood pattern, the distance is 3-5 cm, air holes are evenly distributed on the taper pipe, and the diameter of the air holes is as follows
The spacing is 2cm; the bottoms of all the air pipes are connected in parallel by a tee joint>
On the main air pipe.
1) Weighing 54kg of raw sand, and adding the raw sand into a roller mill;
2) 34.97g of superfine dust collection magnesia powder is weighed and added into a sand mixer, and sand is mixed for 2min;
3) 44.96g of silane coupling agent KH-550 is weighed and added into a sand mixer, and sand is mixed for 2min;
4) Weighing 999g of phosphate binder, adding into a sand mixer, mixing for 2min, discharging sand, filling into a barrel, and covering with wet cloth;
5) Pouring molding sand into a sand box, slightly compacting, and strickling;
6) Introducing dry compressed air (0.6 MPa,14 m) 3 /h)，
7) And testing the solidification degree through steel wire cutting, ending blowing after 14min, and demoulding.
Example 4
The sand mold structure and size were the same as in example 1. The raw sand is 30-50 mesh Fujian sand, the number of inserted pipes is 8, the taper pipe is 170mm long, the diameter of the big end is 25mm, the diameter of the small end is 12mm, one end of the inserted pipe is fixed on the core plate and evenly distributed around the wood pattern, the distance is 3-5 cm, air holes are evenly distributed on the taper pipe, and the diameter of the air holes is as follows
The spacing is 2cm; the bottoms of all the air pipes are connected in parallel by a tee joint>
On the main air pipe.
1) Weighing 54kg of raw sand, and adding the raw sand into a roller mill;
2) 53.62g of superfine dust collection magnesia powder is weighed and added into a sand mixer, and sand is mixed for 2min;
3) 53.62g of silane coupling agent KH-550 is weighed and added into a sand mixer, and sand is mixed for 2min;
4) Weighing 1074.6g of phosphate binder, adding into a sand mixer, mixing for 2min, discharging sand, filling into a barrel, and covering with wet cloth;
5) Pouring molding sand into a sand box, slightly compacting, and strickling;
6) Introducing dry compressed air (0.6 MPa,14m 3/h),
7) And testing the solidification degree through steel wire cutting, ending blowing after 13min, and demoulding.
Note that: the reduction of the number of the air blowing pipes affects the uniformity of the air flow distribution to a certain extent, thereby affecting the air blowing time. And the blowing time has a great relation with the specific distribution of the blowing pipes in specific sand molds, and the blowing time in the embodiment of the application is tested by a plurality of comparison experiments in a specific sand mold laboratory. The number of the air blowing pipes and the air blowing time can be reasonably adjusted by a person skilled in the art according to the requirements and the type of the sand mold.
Comparative example 1
The raw sand is 30-50 meshes of Fujian sand, an insertion pipe method is not adopted, air inlet plugs are arranged at the bottom of the template, the quantity is large, the weight of the sand mold is 17.5kg, and the size of the sand box is as follows: 400X 330X 100mm, sand mold thickness is only half of examples 1-4, sand mold weight: 17.5kg (only 33% of examples 1 to 4).
1) Weighing 17.5kg of raw sand, and adding the raw sand into a roller mill;
2) Weighing 11.33g of superfine dust collection magnesia powder, adding the superfine dust collection magnesia powder into a sand mixer, and mixing the sand for 2min;
3) 14.58g of silane coupling agent KH-550 is weighed and added into a sand mixer, and sand is mixed for 2min;
4) Weighing 324g of phosphate binder, adding into a sand mixer, mixing for 2min, discharging sand, filling into a barrel, and covering with wet cloth;
5) Pouring molding sand into a sand box, slightly compacting, and strickling;
6) Introducing dry compressed air (0.6 MPa,14m 3/h),
7) And testing the solidification degree through steel wire cutting, ending blowing after 30min, and demoulding.
The total weight of the sand mold of comparative example 1 was only 33% of that of examples 1 to 4, and the thickness was only 50% of that of examples 1 to 4, but the curing time was twice that of examples 2 to 4 because no cannula blow was used, and the curing speed was very slow. The intubation blowing effect of the intubation tube is quite remarkable.
Comparative example 2
The sand mold structure and size were the same as in example 1. The raw sand is 30-50 mesh Fujian sand, and the number of air plugs arranged at the bottom of the template and on the pattern is 12.
1) Weighing 54kg of raw sand, and adding the raw sand into a roller mill;
2) 28.9g of superfine dust collection magnesia powder is weighed and added into a sand mixer, and sand is mixed for 2min;
3) 38.57g of silane coupling agent KH-550 is weighed and added into a sand mixer, and sand is mixed for 2min;
4) Weighing 966.6g of phosphate binder, adding into a sand mixer, mixing for 2min, discharging sand, filling into a barrel, and covering with wet cloth;
5) Pouring molding sand into a sand box, slightly compacting, and strickling;
6)introducing dry compressed air (0.6 MPa,14 m) 3 /h)；
7) And testing the solidification degree through steel wire cutting, ending blowing after 60min, and demoulding.
The sand mold of comparative example 2 was identical to examples 1 to 4, but the curing time was four times longer than that of examples 2 to 4 and the curing speed was very slow since the cannula blow was not used instead of the bottom air lock blow.
The above description of embodiments is only for aiding in the understanding of the method of the present application and its core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (10)
1. A method for preparing a sand mold by an air blowing curing method, which is characterized by comprising the following steps: sequentially mixing superfine fused magnesia powder, a silane coupling agent and a phosphate binder with raw sand to prepare a sand mold;
wherein, the sand mould is prepared by adopting an air blowing solidification method;
the air blowing solidification method adopts a die with a conical air blowing pipe with holes inside.
2. The method of claim 1, wherein the phosphate binder is added in an amount of 1.79% to 1.99% by weight of the raw sand.
3. The method of claim 1, wherein the silane coupling agent is added in an amount of 3.99 to 4.99% by weight of the phosphate binder.
4. The method of claim 1, wherein the ultra-fine fused magnesia powder is added in an amount of 2.99% to 4.99% by weight of the phosphate binder.
5. A method according to claim 3, wherein the silane coupling agent is KH-550.
6. The method of claim 4, wherein the ultra-fine fused magnesia powder is 5000 mesh.
7. The method according to claim 1, wherein the compressed air has a temperature of 10 to 25 ℃, a humidity of 15 to 30RH, and a pressure of 0.6 to 0.8MPa.
8. A mold for an air blown curing process, said mold comprising: the device comprises a sand box, a core plate, a gas storage box, a porous pattern and a porous conical gas blowing pipe;
the bottom of the pattern with the air holes is a core plate;
the core plate is vertically upwards provided with a conical air blowing pipe with holes;
the core plate and the gap at the bottom of the sand box form a gas storage box;
the gas storage box is communicated with the inside of the sand box through the core plate and the conical gas blowing pipe with holes.
9. The mold of claim 8, wherein the gas storage box is provided with a gas inlet.
10. The die of claim 8, wherein the wall of the perforated conical blowing pipe has a blowing hole diameter of 1.5-2 mm and the distance between adjacent blowing holes is 2-4 cm.
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| CN101480703A (en) * | 2008-12-04 | 2009-07-15 | 苏州明志科技有限公司 | Plug-in gasification needle for core making |
| US20180361466A1 (en) * | 2016-03-08 | 2018-12-20 | Shenyang Hyaton Foundry Material Co., Ltd | Method for producing mould and core through curing sodium silicate sand for casting by blowing |
| CN111659857A (en) * | 2019-03-08 | 2020-09-15 | 现代自动车株式会社 | Apparatus for manufacturing cores using inorganic binder |
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| CN101480703A (en) * | 2008-12-04 | 2009-07-15 | 苏州明志科技有限公司 | Plug-in gasification needle for core making |
| US20180361466A1 (en) * | 2016-03-08 | 2018-12-20 | Shenyang Hyaton Foundry Material Co., Ltd | Method for producing mould and core through curing sodium silicate sand for casting by blowing |
| CN111659857A (en) * | 2019-03-08 | 2020-09-15 | 现代自动车株式会社 | Apparatus for manufacturing cores using inorganic binder |
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