CN1057949C - Bimetallic centrifugal casting process for cylindrical casting - Google Patents
Bimetallic centrifugal casting process for cylindrical casting Download PDFInfo
- Publication number
- CN1057949C CN1057949C CN 97105088 CN97105088A CN1057949C CN 1057949 C CN1057949 C CN 1057949C CN 97105088 CN97105088 CN 97105088 CN 97105088 A CN97105088 A CN 97105088A CN 1057949 C CN1057949 C CN 1057949C
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- casting
- cast
- bimetallic
- metal
- layer metal
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- Expired - Fee Related
Links
- 238000005266 casting Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009750 centrifugal casting Methods 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims abstract description 48
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229940117975 chromium trioxide Drugs 0.000 claims description 3
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 241001640558 Cotoneaster horizontalis Species 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a bimetallic centrifugal casting process for cylindrical castings, particularly to a bimetallic centrifugal casting process for a roller gang main body of a strip mill roll gang. The process comprises the following steps: firstly, an outer metal layer is centrifugally cast; 30 to 120 seconds later, an inner metal layer is centrifugally cast, and the casting speed of the outer metal layer and the inner metal layer is 25 to 30 KG/second; the outer metal layer is cast, and meanwhile, protective values are added so that bimetallic castings which are centrifugally cast can be favorably bonded in a metallurgical way; the bimetallic castings have the advantages of smooth inner surface and outer surface, and uniform thickness; the present invention solves the technical problems of ordinary centrifugal machines on casting elongate cylindrical castings.
Description
The present invention relates to a kind of bimetallic centrifugal casting process for cylindrical casting, especially be suitable for the bimetal centrifugal casting method of roller-way body in the strip mill rollgang.
The clear 57-11758 of Japan Patent (A) has announced a kind of method of casting the tubular composite casting, its feature be earlier with the outer metal sleeve pipe casing of tubular foundry goods good after, with this outer tube centrifuge of packing into, make the outer tube preheating with the high-frequency heating method, and flux is coated on the surface within it, and then the molten metal of cast internal layer.With the tubular composite casting that this kind method produces, it has a process that makes the good outer layer metal preheating for the second time of casting, so its operation is various, and the cost height, and waste energy.
Another kind of prior art is a kind of " method of centrifugal casting bi-metal double-pipe " of Chinese patent CN85102836A bulletin, this method adopts cast outer layer metal liquation earlier, treat that the outer layer metal liquation is cooled to solidus and extremely and in the following 200 ℃ scope begins to pour into a mould the inner layer metal liquation again, it has omitted the operation that is coated with flux between outer layer metal preheating and double layer of metal.But it also has the following disadvantages: 1, behind outer molten metal casting complete, be cooled to solidus and extremely and in following 200 ℃ of scopes pour into a mould the inner layer metal liquation again, and this temperature determine that needing expensive temperature measuring set realizes, for example radiant-energy thermometer or infrared temperature measuring instrument etc., it has not only increased equipment investment, but also makes the loaded down with trivial details raising that causes casting cost of operation; 2, this method does not add covering slag when the cast outer sphere molten metal, cause the outer layer metal inner surface of cast easily to produce oxide layer, because when cast inner layer metal liquid, also need certain hour at interval, continuity process during this period of time can make the temperature of outer layer metal inner surface change and cause outer layer metal two ends one end thickness low LCL or fuse bad; 3, the method is not considered the poring rate problem, and the speed of poring rate can directly influence the quality of foundry goods, and method in sum only is applicable to that casting length is not more than 450 millimeters, and can not guarantee for the quality of length greater than the tubular foundry goods of 7 times of diameters.
Task of the present invention just provides a kind of bimetallic centrifugal casting process for cylindrical casting, and it solves bimetallic particularly to the bimetallic casting quality of long part with simple equipment and operation, and can reduce cost and prolongation its service life of tubular foundry goods.
Task of the present invention realizes by following proposal.
A kind of bimetallic centrifugal casting process for cylindrical casting, it comprises the following steps:
(1) coating preparation:
Press refractory material high-alumina fly (Al in the coating
2O
3) percetage by weight preparation:
Aluminum phosphate 25-30%
Chromium trioxide 0.44-0.53% water 70%
Binding agent added add high-alumina fly after stirring in the entry again and stir and get final product;
(2) cleaning casting mold, and assemble the end cap at two ends, after 150-250 ℃ of casting mold preheating, wall sprays above-mentioned coating equably within it, delivers to after to be dried and prepares on the centrifuge to pour into a mould;
(3) will fill the casting ladle of two kinds of different metal liquations, be separately positioned on the cast dolly at casting mold two ends, wherein prepare also to be provided with on the running channel of cast outer layer metal the funnel of dress covering slag;
(4) first centrifugal casting outer layer metal, treat that outer layer metal cast finishes after, 30-120 second at interval, centrifugal casting inner layer metal again, the poring rate of its double layer of metal is the 25-30 Kilograms Per Second;
(5) after double layer of metal cast finishes, treat casting mold inner layer metal inner wall temperature in the time of 850-880 ℃, the casting mold handling that will have this foundry goods to the holding pit the insulation slow cooling after 24-48 hour the demoulding take out foundry goods.
The thickness of above-mentioned casting mold inner-wall spraying coating is the 2-3 millimeter, and the rotating speed of casting mold is 650-700 rev/min.
Above-mentioned covering slag is the glass slag that prevents the metal bath surface oxidation, and its weight accounts for the 1-2% of cast outer layer metal gross weight and fusing point between 1100-1200 ℃, normal temperature proportion 1.8-2.2 gram/cubic centimetre.
Adopted cast program in the above-mentioned solution by time, speed control bimetallic liquation, and on the casting mold inwall, be coated with specific coating, make the composite casting of centrifugal casting can reach good metallurgical binding, and the bimetallic surfaces externally and internally is smooth, thickness is even, has solved the technical barrier of the microscler barrier part of cast on generic centrifuge.It has not only saved process equipment, and has reduced manufacturing procedure, shortens the production cycle, reduces production costs.
The present invention is described in further detail below in conjunction with embodiment:
Bimetallic tubular foundry goods proposed by the invention is meant that skin is rich chromium cast iron, nickel complexing gold cast iron, build-up wear-resistant alloy or other steel alloys; Internal layer is mild steel, spheroidal graphite cast-iron, worm graphite cast iron, cast iron, the also outer bimetallic opposite with above-mentioned material with internal layer.General this type of foundry goods is used for skin more and need resistance to wears as the rollgang body or the wear-resistant pipeline of internal layer needs of strip mill.
The casting method that the present invention adopts is as follows:
(1) coating preparation: coating except should having enough high temperature resistant and chemical stabilities, also should have the impact strength that can resist centrifugal force concerning centrifugal casting, being subjected to simultaneously has collapsibility performance behind the high temperature.This coating is selected the high-alumina fly (Al of refractoriness more than 1700 ℃ for use
2O
3), binding agent is selected aluminum phosphate for use, selects chromic anhydride (CrO for use for defeated and dispersed dose
3) add quantitative water and form this coating.The weight proportion of pressing high-alumina fly is as follows:
Aluminum phosphate 25-30% chromium trioxide 0.44-0.53% water 70%
The binding agent consumption comes value by casting weight, and casting weight takes off limit with lower limit for one ton, capping more than a ton.Put into automatic spraying machine after fully stirring by the above-mentioned coating for preparing and prepare spraying.
(2) the cleaning casting mold is prepared casting process, and at first with 80-90 ℃ of end cap preheating swabbing then, its thickness is in the 1-2 millimeter, and end cap is assembled in the two ends of casting mold, and end cap contacts circumference and smears seam with thick coating with casting mold.After end cap assembles, send 150-250 ℃ of heating furnace preheating, deliver to again and hang coating on the centrifuge casting mold.Metal mold rotating speed on centrifuge sprays when reaching 500-600 rev/min automatically.Thickness is the 2-3 millimeter, send to be sent from after the heating furnace drying and prepares cast in the scheming.
(3) casting ladle that will fill two kinds of different metal liquations is separately positioned on the cast dolly at casting mold two ends, and the running channel of wherein preparing the cast outer layer metal is provided with the funnel of dress covering slag.At this moment, starting centrifuge makes the casting mold revolution reach 650-700 rev/min, shake the cast dolly, make long running channel enter casting mold, the beginning casting type, poring rate is the 25-30 Kilograms Per Second, this speed is determined by casting ladle bottom part aperture diameter and liquid-column height, after the cast of outer layer metal liquation finishes, at interval 30-120 begins to pour into a mould the inner layer metal liquation second again, the length of this blanking time is relevant with the material of outer layer metal, is that the high rich chromium cast iron of phosphorus content its blanking time is 100 seconds as outer layer metal, is that its phosphorus content 0.5% left and right sides of build-up wear-resistant alloy its blanking time is 35 seconds as outer layer metal.
(4) treat that inner layer metal liquation cast finishes after, (this temperature can be estimated by experience) stopped when the foundry goods inner wall temperature dropped to 850-880 ℃, after the metal mold that will have foundry goods is transported to and is incubated slow cooling 24-48 hour in the holding pit, took out foundry goods and was finished product.
Claims (3)
1, a kind of bimetallic centrifugal casting process for cylindrical casting, it comprises the following steps:
(1) coating preparation: press refractory material high-alumina fly (Al
2O
3) percetage by weight preparation:
Aluminum phosphate 25-30% chromium trioxide 0.44-0.53% water 70% mixes stirring back adding high-alumina fly and stirs;
(2) cleaning casting mold, and assemble the end cap at two ends, with after 150-250 ℃ of the casting mold preheating within it wall spray equably and coat, deliver to after to be dried and prepare cast on the centrifuge;
(3) casting ladle that will fill two kinds of different metal liquations is separately positioned on the casting mold two ends cast dolly, and the running channel of wherein preparing the cast outer layer metal is provided with the funnel that covering slag is housed;
(4) first centrifugal casting outer layer metal, treat that outer layer metal cast finishes after, 30-120 second at interval, centrifugal casting inner layer metal again, the poring rate of its double layer of metal liquid is the 25-30 Kilograms Per Second;
(5) double layer of metal cast finishes, and treats that the foundry goods inner wall temperature will have a foundry goods in the time of 850-880 ℃ casting mold handling is incubated to holding pit, and foundry goods is taken out in the demoulding after slow cooling 24-48 hour.
2, according to the bimetallic centrifugal casting process for cylindrical casting described in the claim 1, it is characterized in that: above-mentioned casting mold inner-wall spraying paint thickness is the 2-3 millimeter, and the casting mold revolution is 500-600 rev/min.
3, according to the bimetallic centrifugal casting process for cylindrical casting described in the claim 1; it is characterized in that: the weight of above-mentioned covering slag accounts for the 1-2% of cast outer layer metal gross weight and its fusing point between 1100-1200 ℃, normal temperature proportion 1.8-2.2 gram/cubic centimetre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97105088 CN1057949C (en) | 1997-02-05 | 1997-02-05 | Bimetallic centrifugal casting process for cylindrical casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97105088 CN1057949C (en) | 1997-02-05 | 1997-02-05 | Bimetallic centrifugal casting process for cylindrical casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190041A CN1190041A (en) | 1998-08-12 |
| CN1057949C true CN1057949C (en) | 2000-11-01 |
Family
ID=5167649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97105088 Expired - Fee Related CN1057949C (en) | 1997-02-05 | 1997-02-05 | Bimetallic centrifugal casting process for cylindrical casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1057949C (en) |
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-
1997
- 1997-02-05 CN CN 97105088 patent/CN1057949C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503010B (en) * | 2009-01-21 | 2012-10-03 | 成都三强轧辊股份有限公司 | Steel ring wear-resistant casting parts and method for producing the same |
| CN109465425A (en) * | 2018-12-27 | 2019-03-15 | 桂林理工大学 | A kind of manufacturing method of aluminum-magnesium alloy three-layer unequal thickness composite annular casting billet |
| CN109465425B (en) * | 2018-12-27 | 2020-11-24 | 桂林理工大学 | A kind of manufacturing method of aluminum-magnesium alloy three-layer unequal thickness composite annular casting billet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1190041A (en) | 1998-08-12 |
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