CN102825215B - Lost foam casting method for heavy casting - Google Patents
Lost foam casting method for heavy casting Download PDFInfo
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- CN102825215B CN102825215B CN2012103792605A CN201210379260A CN102825215B CN 102825215 B CN102825215 B CN 102825215B CN 2012103792605 A CN2012103792605 A CN 2012103792605A CN 201210379260 A CN201210379260 A CN 201210379260A CN 102825215 B CN102825215 B CN 102825215B
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- negative pressure
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- sandbox
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- 238000005266 casting Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000010114 lost-foam casting Methods 0.000 title claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 244000035744 Hura crepitans Species 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 230000002441 reversible effect Effects 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 239000010433 feldspar Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 4
- 235000013312 flour Nutrition 0.000 claims description 4
- 239000004816 latex Substances 0.000 claims description 4
- 229920000126 latex Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920000609 methyl cellulose Polymers 0.000 claims description 4
- 239000001923 methylcellulose Substances 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229940080314 sodium bentonite Drugs 0.000 claims description 4
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 4
- -1 50 parts Substances 0.000 claims description 3
- 241000190070 Sarracenia purpurea Species 0.000 claims description 3
- 210000000988 bone and bone Anatomy 0.000 claims description 3
- 229910052571 earthenware Inorganic materials 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 239000006260 foam Substances 0.000 abstract description 8
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 239000000919 ceramic Substances 0.000 abstract 1
- 239000003973 paint Substances 0.000 abstract 1
- 238000010422 painting Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a lost foam casting method for a heavy casting. The method comprises the following steps of: a. manufacturing a foam model; b. mounting a counter-deformation bracket: manufacturing the steel-structured counter-deformation bracket according to the size and the length of a workpiece and placing the counter-deformation bracket on the bottom of the foam model; c. painting: the thickness of the paint is not less than 4mm; d. drying: placing the painted foam model in a drying room for drying at the constant temperature of 50 DEG C; e. fixing core: placing the steel-structured bracket in an inner cavity of the foam model so as to fix the model, and putting the whole foam model into a sandbox together; f. boxing: enabling the sandbox containing the foam model to drop sand evenly, vibrating the sandbox during sand dropping, gradually enhancing the vibration amplitude with the increasing of added sand quantity, mounting a main runner and a branch runner of a ceramic tube, and placing a pouring cup; g. pouring: opening a vacuum pump for vacuum pumping before pouring; h. releasing negative pressure: after pouring, keeping the negative pressure for 8 to 15 minutes until solidification of an iron liquid, and then releasing the negative pressure; and i. cleaning.
Description
Technical field
The present invention relates to a kind of casting method, relate in particular to a kind of heavy castings lost-foam casting method.
Background technology
The casting large-scale foundry goods requires very high to model.Adopt different models, casting method is also different.Traditional method is to adopt the follr sand casting, first model is carried out to external mold, then dries, places core, mould assembling, cast, cleaning polishing.Adopt this conventional method, although can casting large-scale foundry goods, labour intensity is large, take time and effort, and casting quality is unstable: fineness does not reach requirement, the yielding out-of-shape, also often overweight that makes, and energy consumption is large, and cost is high.Afterwards, people attempted adopting lost-foam casting method.Lost foam casting is a kind of more advanced casting method, and its advantage is that time saving and energy saving, any surface finish, casting quality are stable.Can say that lost foam casting is the revolution on China's casting history.But, also there is technical problem in the heavy castings of existing lost foam casting more than 5 tons: because the heavy castings space is large, complex structure, while often casting, casting rate and iron liquid setting rate do not catch up with the bubbles model gasification rate, thereby cause and subside, and cause casting deformation to be scrapped even fully.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of lost-foam casting method that can cast heavy castings more than 5 tons.
In order to solve the problems of the technologies described above, casting method of the present invention comprises the steps:
A. make bubbles model: according to designing requirement, make bubbles model;
B., the reversible deformation carriage is installed: make steel structure reversible deformation carriage according to workpiece size, length, the reversible deformation carriage is placed in to the bubbles model bottom, during vanning, the direction shape is consistent with the carriage shape down for model;
C. coat: ready-made bubbles model is coated with and coats, the thickness of coating must not be less than 4mm, the component of described coating and weight portion thereof are 18 parts of silica flours, 14 parts of feldspars in powder, 8 parts, palm fibre corundum, 5 parts of white fused aluminas, 15 parts of bauxites, 20 parts of talcum powder, 20 parts of graphite powders, 1.5 parts of latexes, 1 part of sodium bentonite, 2 parts of Ludox, 1.5 parts of resin particles, 0.2 part, aluminum sulfate, 0.5 part of methylcellulose, 50 parts, water, the preparation process of described coating is that (1) is first by the latex of described ratio, Ludox, resin particle and water mix and blend make abundant dissolving, standing 10 minutes, (2) add all the other component materials in described ratio, the limit edged stirs, stir 40 minutes, can use,
D. dry; The bubbles model of first-class coating is placed in baking room to constant temperature 50 degree and dries, till being coated with coating and drying according to the wall thickness of workpiece;
E. cored bone: steel structure bracing frame is placed in to the bubbles model inner chamber with fixed model, together puts into sandbox;
F. vanning: evenly lower husky to the sandbox that installs bubbles model, while descending the husky sandbox that shakes, along with the sand amount increase added adds large amplitude gradually, and move towards to install earthenware master running channel and a running channel according to concrete structure and the iron liquid of workpiece, then at sandbox surface coverage thin film, and place and water cup;
G. cast: first open vavuum pump during cast and vacuumize, while starting to pour into a mould, pressure is negative pressure 0.05Mp, is pressurized to gradually negative pressure 0.1Mp while being poured into workpiece 1/3rd weight within 15 seconds;
H. discharge negative pressure: after cast, 8-15 minute negative pressure retention time treated that iron liquid solidified, and discharged negative pressure.
I. cleaning: casting parts thermal insulation 4-8 hour, then mould turnover, fall part, sand throwing, remove coating protection layer, polishing dead head.
Adopt method of the present invention, owing in the bubbles model bottom, the reversible deformation carriage being installed, can effectively prevent pattern finish after-tack distortion, the distortion that can correct foundry goods; Coating of the present invention is a kind of coating that is exclusively used in heavy castings evaporative pattern more than 5 tons, and intensity is high, resistance to elevated temperatures good, collapsibility is good, can overcome that heavy castings more than 5 tons are yielding, the defect of poor surface smoothness, and preparation method for coating is simple, and cost is low; Owing to being provided with steel structure arbor at the bubbles model inner chamber, can effectively preventing from casting cycle not causing and subsiding because casting rate and setting rate catch up with model foam gasification rate, thereby avoid casting deformation; While starting to pour into a mould, pressure is negative pressure 0.05Mp, to produce the smooth and easy inflow of a large amount of gas obstruction iron liquid while being poured into workpiece 1/3rd weight in die cavity, because the speed of iron liquid does not catch up with the speed of foam gasification, be pressurized to gradually negative pressure 0.1Mp within 15 seconds, can successfully the gas in die cavity be discharged to the influx that increases iron liquid like this, so that iron liquid is the filling die cavity as early as possible, thereby avoid crush to damage foundry goods.Method of the present invention can overcome the defect of traditional heavy castings casting method and the defect that evaporative pattern can not be cast heavy castings more than 5 tons, the enough lost foam castings of energy heavy castings more than 5 tons, the casting quality of casting is stable, regular shape standard, any surface finish, time saving and energy saving, energy consumption is low, and cost is low.
The specific embodiment
Below the present invention is described in detail:
Casting method of the present invention comprises the steps:
A. make bubbles model: according to designing requirement, make bubbles model;
B., the reversible deformation carriage is installed: make steel structure reversible deformation carriage according to workpiece size, length, the reversible deformation carriage is placed in to the bubbles model bottom, during vanning, the direction shape is consistent with the carriage shape down for model;
C. coat: ready-made bubbles model is coated with and coats, the thickness of coating must not be less than 4mm, the component of described coating and weight portion thereof are 18 parts of silica flours, 14 parts of feldspars in powder, 8 parts, palm fibre corundum, 5 parts of white fused aluminas, 15 parts of bauxites, 20 parts of talcum powder, 20 parts of graphite powders, 1.5 parts of latexes, 1 part of sodium bentonite, 2 parts of Ludox, 1.5 parts of resin particles, 0.2 part, aluminum sulfate, 0.5 part of methylcellulose, 50 parts, water, the preparation process of described coating is that (1) is first by the latex of described ratio, Ludox, resin particle and water mix and blend make abundant dissolving, standing 10 minutes, (2) add all the other component materials in described ratio, the limit edged stirs, stir 40 minutes, can use,
D. dry; The bubbles model of first-class coating is placed in baking room to constant temperature 50 degree and dries, till being coated with coating and drying according to the wall thickness of workpiece;
E. cored bone: steel structure bracing frame is placed in to the bubbles model inner chamber with fixed model, together puts into sandbox;
F. vanning: evenly lower husky to the sandbox that installs bubbles model, while descending the husky sandbox that shakes, along with the sand amount increase added adds large amplitude gradually, and move towards to install earthenware master running channel and a running channel according to concrete structure and the iron liquid of workpiece, then at sandbox surface coverage thin film, and place and water cup;
G. cast: first open vavuum pump during cast and vacuumize, while starting to pour into a mould, pressure is negative pressure 0.05Mp, is pressurized to gradually negative pressure 0.1Mp while being poured into workpiece 1/3rd weight within 15 seconds;
H. discharge negative pressure: after cast, 8-15 minute negative pressure retention time treated that iron liquid solidified, and discharged negative pressure.
I. cleaning: casting parts thermal insulation 4-8 hour, then mould turnover, fall part, sand throwing, remove coating protection layer, polishing dead head.
In the above-mentioned coating component material, silica flour, feldspar in powder, brown corundum, white fused alumina, bauxite, talcum powder and graphite powder are the aggregates of coating of the present invention, energy is high temperature resistant, the intensity of enhancing coating, wherein adds feldspar in powder, brown corundum and white fused alumina more can improve the resistance to elevated temperatures of coating, the intensity of enhancing coating; Latex, Ludox and resin particle are binding agents; Sodium bentonite and methylcellulose are suspending agents; Aluminum sulfate is dispersant, add aluminum sulfate can improve coating collapsibility, guaranteed any surface finish of foundry goods.
Claims (1)
1. a heavy castings lost-foam casting method, is characterized in that comprising the steps:
A. make bubbles model: according to designing requirement, make bubbles model;
B., the reversible deformation carriage is installed: make steel structure reversible deformation carriage according to workpiece size, length, the reversible deformation carriage is placed in to the bubbles model bottom, during vanning, the direction shape is consistent with the carriage shape down for model;
C. coat: ready-made bubbles model is coated with and coats, the thickness of coating must not be less than 4mm, the component of described coating and weight portion thereof are 18 parts of silica flours, 14 parts of feldspars in powder, 8 parts, palm fibre corundum, 5 parts of white fused aluminas, 15 parts of bauxites, 20 parts of talcum powder, 20 parts of graphite powders, 1.5 parts of latexes, 1 part of sodium bentonite, 2 parts of Ludox, 1.5 parts of resin particles, 0.2 part, aluminum sulfate, 0.5 part of methylcellulose, 50 parts, water, the preparation process of described coating is that (1) is first by the latex of described ratio, Ludox, resin particle and water mix and blend make abundant dissolving, standing 10 minutes, (2) add all the other component materials in described ratio, the limit edged stirs, stir 40 minutes, can use,
D. dry; The bubbles model of first-class coating is placed in baking room to constant temperature 50 degree and dries, till being coated with coating and drying according to the wall thickness of workpiece;
E. cored bone: steel structure bracing frame is placed in to the bubbles model inner chamber with fixed model, together puts into sandbox;
F. vanning: evenly lower husky to the sandbox that installs bubbles model, while descending the husky sandbox that shakes, along with the sand amount increase added adds large amplitude gradually, and move towards to install earthenware master running channel and a running channel according to concrete structure and the iron liquid of workpiece, then at sandbox surface coverage thin film, and place and water cup;
G. cast: first open vavuum pump during cast and vacuumize, while starting to pour into a mould, pressure is negative pressure 0.05Mp, is pressurized to gradually negative pressure 0.1Mp while being poured into workpiece 1/3rd weight within 15 seconds;
H. discharge negative pressure: after cast, 8-15 minute negative pressure retention time treated that iron liquid solidified, and discharged negative pressure;
I. cleaning: casting parts thermal insulation 4-8 hour, then mould turnover, fall part, sand throwing, remove coating protection layer, polishing dead head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103792605A CN102825215B (en) | 2012-10-09 | 2012-10-09 | Lost foam casting method for heavy casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103792605A CN102825215B (en) | 2012-10-09 | 2012-10-09 | Lost foam casting method for heavy casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102825215A CN102825215A (en) | 2012-12-19 |
| CN102825215B true CN102825215B (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103792605A Active CN102825215B (en) | 2012-10-09 | 2012-10-09 | Lost foam casting method for heavy casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI594823B (en) * | 2014-12-03 | 2017-08-11 | 神戶製鋼所股份有限公司 | Buoyancy transmitting tool |
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| CN103418747A (en) * | 2013-08-25 | 2013-12-04 | 阳城县华王通用离心铸管厂 | Lost foam casting process for double-bell-and-spigot grey cast iron thin wall pipe fittings and sand box for process |
| CN103521703B (en) * | 2013-09-18 | 2015-06-24 | 宁夏共享集团有限责任公司 | Method for preventing shifting of lost foam sand model |
| CN103909211B (en) * | 2014-03-27 | 2016-08-24 | 吉安汇诚实业发展有限公司 | A kind of from peeling off paint specially for disappearing cast mold |
| CN104190867B (en) * | 2014-08-28 | 2016-05-11 | 宁夏共享装备有限公司 | A kind of method that improves evaporative pattern dimensional stability |
| CN104439075A (en) * | 2014-11-28 | 2015-03-25 | 柳州市正龙机械制造有限公司 | Evanescent mode casting technology |
| CN105312501A (en) * | 2015-11-02 | 2016-02-10 | 广西博白县三田机械制造有限公司 | Die casting method |
| CN105312500A (en) * | 2015-11-02 | 2016-02-10 | 广西博白县三田机械制造有限公司 | Mold casting method |
| CN106238680B (en) * | 2016-08-30 | 2018-07-20 | 河北瑞欧消失模科技有限公司 | A kind of lost foam casting process of automobile saddle-type traction base |
| CN108311637A (en) * | 2017-01-17 | 2018-07-24 | 郭玉盼 | A kind of strong shell casting technique |
| CN110125332A (en) * | 2019-05-23 | 2019-08-16 | 扬州双集机械有限公司 | Automobile die material smelting technology |
| CN114713764A (en) * | 2022-03-02 | 2022-07-08 | 吉林省机械装备制造有限责任公司 | Manufacturing method for solving bending deformation of long shell lost foam casting |
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| JPH04118154A (en) * | 1990-09-06 | 1992-04-20 | Okamoto:Kk | Manufacture of manhole with lost foam casting method |
| JPH1157937A (en) * | 1997-08-22 | 1999-03-02 | Isuzu Motors Ltd | Method for casting piston by lost foam process |
| CN101332501A (en) * | 2008-07-25 | 2008-12-31 | 泰州市永昌冶金设备有限公司 | Vacuum negative-pressure los mould casting technique |
| CN101653815A (en) * | 2009-09-03 | 2010-02-24 | 颜凤娟 | Nonferrous metal lost foam casting process and device |
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2012
- 2012-10-09 CN CN2012103792605A patent/CN102825215B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN86106521A (en) * | 1986-10-03 | 1988-04-13 | 刘汉生 | Quick drying steel casting paint |
| JPH04118154A (en) * | 1990-09-06 | 1992-04-20 | Okamoto:Kk | Manufacture of manhole with lost foam casting method |
| JPH1157937A (en) * | 1997-08-22 | 1999-03-02 | Isuzu Motors Ltd | Method for casting piston by lost foam process |
| CN101332501A (en) * | 2008-07-25 | 2008-12-31 | 泰州市永昌冶金设备有限公司 | Vacuum negative-pressure los mould casting technique |
| CN101653815A (en) * | 2009-09-03 | 2010-02-24 | 颜凤娟 | Nonferrous metal lost foam casting process and device |
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| TWI594823B (en) * | 2014-12-03 | 2017-08-11 | 神戶製鋼所股份有限公司 | Buoyancy transmitting tool |
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| CN102825215A (en) | 2012-12-19 |
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