CN102274929B - Method for preventing lost foam casting product from crushing - Google Patents
Method for preventing lost foam casting product from crushing Download PDFInfo
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- CN102274929B CN102274929B CN2011102298929A CN201110229892A CN102274929B CN 102274929 B CN102274929 B CN 102274929B CN 2011102298929 A CN2011102298929 A CN 2011102298929A CN 201110229892 A CN201110229892 A CN 201110229892A CN 102274929 B CN102274929 B CN 102274929B
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Abstract
The invention discloses a method for preventing a lost foam casting product from crushing, and relates to the technical field of lost foam casting. The method adopts a vacuum foam lost foam casting process which comprises making a form model, coating, drying, burying a box and shaping, pumping vacuum and casting under negative pressure; and a procedure of arranging a plurality of seal air channels is added during box burying and shaping. Due to the adoption of the technical scheme, the method has the advantages of improving the apparent quality of casting, reducing rejection rate and improving the mechanical property and the comprehensive performance of the casting.
Description
Technical field
The present invention relates to the lost foam casting technical field, especially relate to a kind of method that the large-sized hydraulic press slide block adopts crush problem in the lost foam casting process that solves.
Background technology
Lost foam casting is a kind of advanced person's a casting method, is called as " 21st century green casting ", compare with traditional sand casting have the dimensional accuracy height, no somatotype die joint, cost are low, small investment, with short production cycle, characteristics such as environmental pollution is little; Be a kind of development trend of following casting, though lost foam casting has above-mentioned advantage, and the disappearance mould is a physical model; Be not easy crush in the modeling process; But for complex-shaped foundry goods, in the process of the casting metals liquid of use lost-foam casting method casting, because the souring of molten metal; And the violent burning and the gasification of the existence of disappearance mould; Die cavity is all had very big active force, and this active force is inhomogeneous, the crush problem therefore in the lost foam casting process, still often occurs.For example my the large-sized hydraulic press slide block of company's production just the crush problem often occurs.The large-sized hydraulic press slide block is a critical piece of hydraulic press, and the outer profile size of monoblock cast large-sized hydraulic press slide block is 2500X2000X600mm, and when utilizing the casting of existing conventional disappearance modeling method, the probability of crush is very high.The crush of lost foam casting is to occur in the process of casting of molten metal, not only causes foundry goods to be scrapped fully, and wastes a large amount of energy, manpower and materials, delays the production time.The crush problem is that people are reluctant the problem seen most, but is a common problem in Foundry Production, and its key point is that the defeated and dispersed crush that causes appears in bubbles model top, place, sprue gate molding sand easily in the casting cycle.Engineers and technicians are also more thorny to this crush problem, the producer of general use lost foam casting, and the processing method when this crush problem of solution is to take general method to strengthen the consolidation dynamics of molding sand, increases negative pressure, increases poring rate and solves.But often can not avoid above-mentioned crush problem.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method that can prevent crush in the lost foam casting casting process.
For solving the problems of the technologies described above; The technical scheme that the present invention taked is: comprise the manufacturing bubbles model, the swabbing that adopt in the vacuum foam lost foam casting process, dry, bury the case moulding, vacuumize, the operation of casting under the negative pressure; It is characterized in that: increase is provided with the operation that multiple-limb seals air flue in burying the case modeling process; Promptly in apart from bubbles model upper surface 200～300 ㎜ place molding sand, multiple-limb is set and seals air flue; Be convenient to bubbles model top is vacuumized thoroughly, position, sprue gate negative pressure intensity is low and the defeated and dispersed crush that causes of molding sand occurs when preventing under the negative pressure casting.
Further improvement of the present invention is: the swabbing operation is whitewashed in two steps: coating composition and mass percent that the first step is whitewashed use are: silica flour is 44.1%; Granularity is 141 graphite powder (lead powder) 45.2%, and granularity is that 100 crystalline graphite powders are 3.6%, and granularity is that 320 lithium bentonite is 2.3%; Phenolic resins is 2.2%; Carboxymethyl cellulose is 1.31%, and milky white adhesive is 1.28%, n-octyl alcohol 0.01%; Coating composition and mass percent that second step was whitewashed use are: silica flour is 91%, and granularity is that 320 lithium bentonite is 2.98%, and phenolic resins is 2.98%, and carboxymethyl cellulose is 1.51%, and milky white adhesive is 1.51%, and n-octyl alcohol is 0.02%; Coating on the model evenly is applied as 1.8～2.3mm.
Further improvement of the present invention is: the duration of pouring of the operation of casting under the negative pressure, pouring temperature was at 1350 ~ 1400 degree between 100 ~ 130 seconds.
Owing to adopted technique scheme, the technological progress that the present invention obtained is:
Seal air flue through multiple-limb is set, in evacuation process, seal air flue to bubbles model top by multiple-limb, particularly the position, sprue gate is fully vacuumized, reaching increases this position molding sand negative pressure intensity, has avoided sandbox to subside.Simultaneously also should increase the thickness that is coated in the outer field coating of bubbles model, the present invention has screened multiple high performance material, is mixed with a kind of lost foam cast iron special coating of excellent performance.Advantages such as coating has that suspension is good, intensity is high, coating is even, good leveling property, any surface finish, still, flawless.Intensity height, coating do not have cavity, crack defect behind the dry paint layer.Make the coating of bubbles model form a housing with enough support forces.
Description of drawings
Accompanying drawing seals the structural representation of air flue for the present invention prevents multiple-limb in the crush of lost foam casting product method.
Among the figure: 1, seal air flue and molding sand connector, 2, seal pneumatic duct, 3, the negative pressure equipment connector.
The specific embodiment
Below in conjunction with embodiment the present invention is done further explain:
1, makes bubbles model
Shape according to the hydraulic press slide block is made bubbles model (being white mould), and an accumulated slag bag is set in the bottom of bubbles model.
2, swabbing
The even brush coating in the outside of bubbles model, the coating layer thickness of coating reaches 2.2mm.
3, oven dry
, guarantee that coating is fully dry, do not ftracture coated and dried according to common process.
4, bury the case moulding
The bubbles model of above-mentioned processing is placed in the sandbox, buries case with molding sand, and vibration molding, make molding sand have certain degree of packing, and in apart from bubbles model upper surface 230 ㎜ place molding sand, multiple-limb is set and seals air flue according to the common process method.
5, vacuumize
On sandbox, connect vaccum-pumping equipment, sandbox is vacuumized, make the molding sand moulding in the sandbox.
6, cast under the negative pressure
Continue to vacuumize, melted metal liquid is poured in the die cavity, the pouring temperature of molten metal should be about 1370 ℃, casting complete about 120 seconds.
7, moulding cleaning
After the casting solidification cooling, open sandbox, remove cast gate and accumulated slag bag, foundry goods is carried out sand removal handle, and then can qualified warehouse-in through operations such as heat treatment, checks.
Utilize the hydraulic press slide block of this method casting, not only improved the foundry goods external quality, the rate of reducing the number of rejects and seconds also makes the mechanical performance of foundry goods and combination property significantly improve.
Claims (2)
1. method that prevents crush of lost foam casting product; Comprise the manufacturing bubbles model, the swabbing that adopt in the vacuum foam lost foam casting process, dry, bury the case moulding, vacuumize, the operation of casting under the negative pressure; In burying the case modeling process, increase the operation that multiple-limb seals air flue is set; Promptly in apart from bubbles model upper surface 200～300 ㎜ place molding sand, multiple-limb is set and seals air flue; Be convenient to bubbles model top is vacuumized thoroughly, position, sprue gate negative pressure intensity is low and the defeated and dispersed crush that causes of molding sand occurs when preventing under the negative pressure casting; It is characterized in that: the swabbing operation is whitewashed in two steps: coating composition and mass percent that the first step is whitewashed use are: silica flour is 44.1%; Granularity is 141 graphite powder 45.2%, and granularity is that 100 crystalline graphite powders are 3.6%, and granularity is that 320 lithium bentonite is 2.3%; Phenolic resins is 2.2%; Carboxymethyl cellulose is 1.31%, and milky white adhesive is 1.28%, n-octyl alcohol 0.01%; Coating composition and mass percent that second step was whitewashed use are: silica flour is 91%, and granularity is that 320 lithium bentonite is 2.98%, and phenolic resins is 2.98%, and carboxymethyl cellulose is 1.51%, and milky white adhesive is 1.51%, and n-octyl alcohol is 0.02%; Coating on the model evenly is applied as 1.8～2.3mm.
2. the method that prevents crush of lost foam casting product according to claim 1 is characterized in that: the duration of pouring of the operation of casting under the negative pressure, pouring temperature was at 1350 ~ 1400 degree between 100 ~ 130 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102298929A CN102274929B (en) | 2011-08-11 | 2011-08-11 | Method for preventing lost foam casting product from crushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102298929A CN102274929B (en) | 2011-08-11 | 2011-08-11 | Method for preventing lost foam casting product from crushing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102274929A CN102274929A (en) | 2011-12-14 |
| CN102274929B true CN102274929B (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102298929A Expired - Fee Related CN102274929B (en) | 2011-08-11 | 2011-08-11 | Method for preventing lost foam casting product from crushing |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974760B (en) * | 2012-11-22 | 2014-10-29 | 攀钢集团矿业有限公司 | Lost foam casting device and casting method |
| CN103752811A (en) * | 2013-12-25 | 2014-04-30 | 柳州正菱集团有限公司 | Foam pouring cup tool |
| CN105929864A (en) * | 2016-05-31 | 2016-09-07 | 共享装备股份有限公司 | Large-sized complex casting expendable pattern casting process vacuum degree automatic adjustment system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2316069Y (en) * | 1997-12-03 | 1999-04-28 | 辽宁工学院 | Top-pulling type vanishing mould foundry moulding box |
| CN1589185A (en) * | 2001-11-20 | 2005-03-02 | 花王株式会社 | Lost pattern casting method |
| CN101607299A (en) * | 2009-07-17 | 2009-12-23 | 泊头市青峰机械有限公司 | The founding casing with vacuum formative method of large complicated foundry goods |
| CN101767186A (en) * | 2010-01-05 | 2010-07-07 | 河北冀凯铸业有限公司 | Method for preventing crush of lost foam casting product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05261470A (en) * | 1992-03-16 | 1993-10-12 | Achilles Corp | Full mold casting method |
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2011
- 2011-08-11 CN CN2011102298929A patent/CN102274929B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2316069Y (en) * | 1997-12-03 | 1999-04-28 | 辽宁工学院 | Top-pulling type vanishing mould foundry moulding box |
| CN1589185A (en) * | 2001-11-20 | 2005-03-02 | 花王株式会社 | Lost pattern casting method |
| CN101607299A (en) * | 2009-07-17 | 2009-12-23 | 泊头市青峰机械有限公司 | The founding casing with vacuum formative method of large complicated foundry goods |
| CN101767186A (en) * | 2010-01-05 | 2010-07-07 | 河北冀凯铸业有限公司 | Method for preventing crush of lost foam casting product |
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| CN102274929A (en) | 2011-12-14 |
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Granted publication date: 20121128 Termination date: 20130811 |