CN102366811A - Preparation method of molding sand for gray iron casting - Google Patents
Preparation method of molding sand for gray iron casting Download PDFInfo
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- CN102366811A CN102366811A CN2011103072440A CN201110307244A CN102366811A CN 102366811 A CN102366811 A CN 102366811A CN 2011103072440 A CN2011103072440 A CN 2011103072440A CN 201110307244 A CN201110307244 A CN 201110307244A CN 102366811 A CN102366811 A CN 102366811A
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Abstract
The invention discloses a preparation method of molding sand for gray iron casting, comprising the following three steps: preparing raw materials, preparing the molding sand, and mixing the molding sand. The preparation method has the advantages of simple process steps, easy operation, no use of coal dust, clean workshop, little pollution, and low cost and environmental protection by using straw powder, modified starch and other renewable raw materials. The prepared molding sand has small gas content, short drying time, good permeability and high baked tensile strength in casting, and can improve the releasability of the sand mold, further improving the fineness of casts.
Description
Technical field
The present invention relates to casting field, particularly sand casting.
Background technology
Molding sand is in sand casting, to be used for the material of moulding, and molding sand is generally mixed by Modeling Materials such as casting model powder, moulding sand binder and adminiclies according to a certain percentage, also can use natural silica sand argillaceous.The effect of molding sand in casting process is very important, and the casting wasted product that causes because of the poor quality of molding sand accounts for more than 30% of the total waste product of foundry goods.Common requirement to molding sand is: good flowability, certain plasticity, gas permeability and knockability preferably.
The Chinese patent publication number is CN101574725A, and the patent of invention that open day is on November 11st, 2009 discloses a kind of molding sand and preparation technology who is used for cast aluminium, and the molding sand that is used for cast aluminium comprises following component: old sand, fresh sand, bentonite, moisture content; Its preparation technology's mulling method is: according to proportioning weighing old sand, fresh sand, bentonite is done earlier and was mixed 10～20 seconds, adds water again and mixes 80～100 seconds, puts sand about 20 seconds after mixed.Though this invention has strengthened the fineness on aloxite spare surface to a certain extent, its flowability is weak, gas permeability is relatively poor, and degree of adhesion also a little less than.
One Chinese patent application number is that 201010271352.2 patent application discloses a kind of molding sand that is used to cast body class foundry goods, comprises return sand and fresh sand, and it is characterized in that: said molding sand also comprises potter's clay and coal dust; The weight portion ratio of said return sand, fresh sand, potter's clay and coal dust is: return sand 92-95, and fresh sand 2-5, potter's clay 1.5-3.5, coal dust 0.5-1.5, all the other are water.Use and find that still there are defectives such as gas forming amount is big, release property is relatively poor in this molding sand, can not satisfy the requirement that casting quality is increased day by day.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of preparation method of gray iron moulding sand for casting.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
A kind of preparation method of gray iron moulding sand for casting comprises the steps:
1) preparation batching: the weight weighing following raw materials according by weight percentage of the batching for preparing as required, modified starch 60-70%, glycerine 1.5-2.5%, sodium acid carbonate 2-5%; Brown iron oxide 10-15%, straw powder material 5-8%, surplus is a water, above-mentioned load weighted raw material is added in the agitated reactor mix; And being heated to 80-85 ℃, the duration is 1-2 hour, then; Composite material in the agitated reactor is poured out, dried or dry and be processed into pulvis, promptly make batching;
2) preparation molding sand: the weight weighing following raw materials according by weight of the molding sand for preparing as required, old sand 93-95 part, fresh sand 2-4 part, bentonite 0.3-0.8 part, batching 3.5-6.5 part of step 1) preparation, water 5-8 part;
3) old sand, fresh sand and the bentonite of weighing are put into puddle mixer mixed system molding sand: with step 2), add the water of 60-70%, mix and make 25-45 minute, add batching and remaining water then, and the system of mixing again getting final product in 25-45 minute.
Wherein, The preparation method of said modified starch adds one or more selected plant flours in starch reaction stills, and is heated to 130 ℃-150 ℃, and the duration is 1-3 hour; Then; After material in the starch reaction still poured out and dry, handle, dry, be ground into powder through water acidification again, promptly get said modified starch.
Wherein, the preparation method of said straw powder material does, pulverizes in pulverizer cleaning the agricultural crop straw that dries, and crosses standard screen then, and the powder of getting particle size range and being between the 50-200 order gets final product.
Preparation method of the present invention has following beneficial effect:
1. step of preparation process is simple, and is easy to operate, do not adopt coal dust, and the workshop is clean, pollution is few; Adopt renewable raw materials such as straw powder material, modified starch, cost is low, environmental protection.
2. the moulding-sand property of the inventive method preparation is good; Specifically, in casting process, the foundry goods gas forming amount that adopts this molding sand to produce is little, drying time weak point, good permeability, baked tensile strength height; And can improve the release property of sand mold; To the sensitiveness of moisture, defectives such as the scab of foundry goods, burning into sand, sand washing, pore are had improve significantly simultaneously when reducing cast, can make foundry goods further improve fineness.
The specific embodiment
The modified starch and the straw powder material that adopt among the following embodiment prepare as follows:
The preparation modified starch: corn flour is added in the starch reaction still, and be heated to 140 ℃, the duration is 2 hours; Then; After material in the starch reaction still poured out and dry, handle, dry, be ground into powder through water acidification again, promptly get said modified starch.
The preparation straw powder material: will clean the maize straw that dries and in pulverizer, pulverize, and cross standard screen then, the powder of getting particle size range and being between the 50-200 order gets final product.
Embodiment one
A kind of preparation method of gray iron moulding sand for casting comprises the steps:
1) preparation batching: the weight weighing following raw materials according by weight percentage of the batching for preparing as required, modified starch 60%, glycerine 2.5%, sodium acid carbonate 2%; Brown iron oxide 15%, straw powder material 5%, surplus is a water, above-mentioned load weighted raw material is added in the agitated reactor mix; And being heated to 85 ℃, the duration is 1 hour, then; Composite material in the agitated reactor is poured out, dried or dry and be processed into pulvis, promptly make batching;
2) preparation molding sand: the weight weighing following raw materials according by weight of the molding sand for preparing as required, 93 parts of old sands, 4 parts of fresh sands, 0.3 part of bentonite, 6.5 parts of the batchings of step 1) preparation, 5 parts in water;
3) old sand, fresh sand and the bentonite of weighing are put into puddle mixer mixed system molding sand: with step 2), add 60% water, mix and make 45 minutes, add batching and remaining water then, and the system of mixing again getting final product in 25 minutes.
Embodiment two
A kind of preparation method of gray iron moulding sand for casting comprises the steps:
1) preparation batching: the weight weighing following raw materials according by weight percentage of the batching for preparing as required, modified starch 70%, glycerine 1.5%, sodium acid carbonate 5%; Brown iron oxide 10%, straw powder material 8%, surplus is a water, above-mentioned load weighted raw material is added in the agitated reactor mix; And being heated to 80 ℃, the duration is 2 hours, then; Composite material in the agitated reactor is poured out, dried or dry and be processed into pulvis, promptly make batching;
2) preparation molding sand: the weight weighing following raw materials according by weight of the molding sand for preparing as required, 95 parts of old sands, 2 parts of fresh sands, 0.8 part of bentonite, 3.5 parts of the batchings of step 1) preparation, 8 parts in water;
3) old sand, fresh sand and the bentonite of weighing are put into puddle mixer mixed system molding sand: with step 2), add 70% water, mix and make 25 minutes, add batching and remaining water then, and the system of mixing again getting final product in 45 minutes.
Embodiment three
A kind of preparation method of gray iron moulding sand for casting comprises the steps:
1) preparation batching: the weight weighing following raw materials according by weight percentage of the batching for preparing as required, modified starch 65%, glycerine 2.0%, sodium acid carbonate 3.5%; Brown iron oxide 12.5%, straw powder material 6.5%, surplus is a water, above-mentioned load weighted raw material is added in the agitated reactor mix; And being heated to 83 ℃, the duration is 1.5 hours, then; Composite material in the agitated reactor is poured out, dried or dry and be processed into pulvis, promptly make batching;
2) preparation molding sand: the weight weighing following raw materials according by weight of the molding sand for preparing as required, 94 parts of old sands, 3 parts of fresh sands, 0.5 part of bentonite, 5 parts of the batchings of step 1) preparation, 6.5 parts in water;
3) old sand, fresh sand and the bentonite of weighing are put into puddle mixer mixed system molding sand: with step 2), add 65% water, mix and make 35 minutes, add batching and remaining water then, and the system of mixing again getting final product in 35 minutes.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technological process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technological process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technological process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (3)
1. the preparation method of a gray iron moulding sand for casting is characterized in that, comprises the steps: 1) the preparation batching: the weight weighing following raw materials according by weight percentage of the batching for preparing as required changes
Property starch 60-70%, glycerine 1.5-2.5%, sodium acid carbonate 2-5%, brown iron oxide 10-15%; Straw powder material 5-8%, surplus is a water, above-mentioned load weighted raw material is added in the agitated reactor mix; And being heated to 80-85 ℃, the duration is 1-2 hour, then; Composite material in the agitated reactor is poured out, dried or dry and be processed into pulvis, promptly make batching;
2) preparation molding sand: the weight weighing following raw materials according by weight of the molding sand for preparing as required, old sand 93-95 part, fresh sand 2-4 part, bentonite 0.3-0.8 part, batching 3.5-6.5 part of step 1) preparation, water 5-8 part;
3) old sand, fresh sand and the bentonite of weighing are put into puddle mixer mixed system molding sand: with step 2), add the water of 60-70%, mix and make 25-45 minute, add batching and remaining water then, and the system of mixing again getting final product in 25-45 minute.
2. the method for claim 1, wherein the preparation method of said modified starch adds one or more selected plant flours in starch reaction stills; And be heated to 130 ℃-150 ℃; Duration is 1-3 hour, then, and after the material in the starch reaction still poured out and dry; Handle, dry, be ground into powder through water acidification again, promptly get said modified starch.
3. the method for claim 1, wherein the preparation method of said straw powder material does, pulverizes in pulverizer cleaning the agricultural crop straw dry, crosses standard screen then, and the powder of getting particle size range and being between the 50-200 order gets final product.
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| CN2011103072440A CN102366811A (en) | 2011-10-10 | 2011-10-10 | Preparation method of molding sand for gray iron casting |
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Application publication date: 20120307 |