CN102205395A - Casting method based on vacuum sealed molding combined with lost foam casting - Google Patents
Casting method based on vacuum sealed molding combined with lost foam casting Download PDFInfo
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- CN102205395A CN102205395A CN2011101478534A CN201110147853A CN102205395A CN 102205395 A CN102205395 A CN 102205395A CN 2011101478534 A CN2011101478534 A CN 2011101478534A CN 201110147853 A CN201110147853 A CN 201110147853A CN 102205395 A CN102205395 A CN 102205395A
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Abstract
The invention belongs to a casting method combining vacuum sealed molding with lost foam casting; a decelerator shell is divided into two parts, wherein one part is a decelerator housing which adopts a metal mold, and the other part is bearing guiding seat which adopts a foam mold; the guiding seat foam mold is used as a part of a vacuum sealed molding mold, is film-coated with the decelerator housing metal mold, is filled with sand and jolted; the foam material can not be drawn after mold-drawing, and can be cast with a casting mold; the foam material is burnt off by metal liquid and is substituted by the metal liquid to form a part of the casting.
Description
Technical field
The present invention is a kind of casting method that combines with lost foam casting based on vacuum sealed molding, belongs to the cast shaping process technology.
Background technology
The founding casing with vacuum technology is the novel foundry engieering that grows up in recent decades.The technical process of founding casing with vacuum comprises that case is buried in one oven dry one of a foam-formed composition model bundle one swabbing, vibrations moulding one vacuumizes (foam type vaporization) casting solidification of casting under the negative pressure and cools off a sand removal.Founding casing with vacuum belongs to cavityless casting, and the general employing of its model is foam-formed, and the shape of model is identical with the shape of foundry goods.After model assembling preliminary treatment is finished, place it in above the sand in the sandbox, in case, insert dry molding sand then, after sand fills up sandbox, adopt vibrations machinery sand jolt ramming, and make sand be filled into each corner of model, above sandbox, cover sealing film then sandbox vacuumized, vacuumize the back sand just and model fit together, mobile, form fixing sand mold, can pour into a mould this moment by the running channel on the model.The molten metal of high temperature melts model in the casting process, and the space that molten metal occupies model forms foundry goods, and model becomes gas or flue dust is taken away by vacuum system.Take out the overall process that the casting cleaning dead head is promptly finished casting behind the cooling forming.Founding casing with vacuum is as a kind of emerging advanced person's foundry engieering, be particularly suitable for single and mini-batch production production, it has saved the expense of making wooden model, metal pattern, reduced the production cycle of die cost and mould, polluting advantages such as little, that production efficiency is high, cost is low, cast(ing) surface and inherent quality are good even also have when producing in enormous quantities, is the development trend of foundry engieering.But founding casing with vacuum generally can only be used for middle-size and small-size foundry goods at present, this is the low-cost material that can vaporize rapidly in the time of need using high temperature owing to model, its proportion is generally all smaller, as the proportion of bubbles model proportion much smaller than sand, when the vibrations moulding, therefore model can produce unsteady, causes casting deformation or influences the final size precision of foundry goods.These are still not obvious to small-sized foundry goods, but concerning heavy castings, the unsteady of model is certain to cause that very big dimensional discrepancy, distortion appear in foundry goods, causes waste product.In addition, the general more complicated of the structure of heavy castings, even Fu Za foundry goods not too, the packed density of the sand at model limit, place, angle and the density of model center are also inequality, especially the sand of sandbox inner model bottom surface, side is difficult to tamp, this will inevitably influence casting quality, can not produce finished product concerning heavy castings even at all.Therefore present founding casing with vacuum production line all is to be used to produce the hundreds of kilogram with interior middle-size and small-size foundry goods, and their sandbox, model are all smaller, can be relatively easy to jolt ramming or tamps.Sandbox does not need upset when producing middle-size and small-size foundry goods simultaneously, just can tamp substantially, so its sandbox all is the open cubic staving sandbox in upper end, the sidewall of sandbox and the end of sandbox are one, the inside or the inside at the bottom of the sandbox of sandbox wall are provided with the airway that vacuumizes, and a connector that vacuumizes is set on the outer wall of sandbox gets final product.When the sandbox of this spline structure is used for the casting large-scale foundry goods, because there is the vacuum gradient in sand inside when vacuumizing, promptly near the vacuum bleeding point is bigger, and it is less away from the vacuum of bleeding point position, make the sand can not moulding, particularly behind casting of molten metal, the gas in the die cavity after a large amount of disappearance mould vaporization can not in time be taken away, the crush problem can occur, can not cast finished product cast.The problem that occurs crush at vacuum inadequately.
Summary of the invention
The present invention be directed to above problem, a kind of casting method that combines with lost foam casting based on vacuum sealed molding is provided.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of casting method that combines with lost foam casting based on vacuum sealed molding, comprise operation such as bury case, vibration molding, vacuumize, the sandbox that moulding is used adopts the sandbox of false bottom detachable cap, at the bottom of comprising sandbox, the sandbox body, on bleed to hang and press thick stick three parts, at the bottom of the case, the sandbox body, on bleed to hang and press thick stick three parts to be provided with the airway that independently vacuumizes, its moulding operation also wrap draw together as under go on foot Sudden
A, on the supporting plate of horizontal, place tire grillage and disappearance mould model, sandbox, the tire grillage is placed on and is used to support disappearance mould model above the supporting plate, be that end face with the real mould of disappearance mould is placed on the tire grillage in the sandbox down generally speaking, carry out pouring and riser systems, on model, have blind hole, groove position to place core iron and fill with resin sand; Sandbox can place simultaneously with disappearance mould model, also can earlier disappearance mould model be placed, and places core iron at blind hole, four groove location potting resin sand then, sandbox is placed on is enclosed within disappearance mould outside on the supporting plate again; Go up shake table then and add type; Flat pattern is scraped in few jolt ramming after the jolt ramming; The part that surpasses plane on the case less;
At the bottom of B, the cope, to spin upside down together with supporting plate at the bottom of sandbox body, the sandbox, supporting plate is being descended at the bottom of cope, remove supporting plate and tire grillage, hang the pressure thick stick placing on the sandbox to bleed, fill up sandbox and make molding sand exceed the sandbox certain height with molding sand, weighting material pressurization and vibration moulding on molding sand;
C, be incumbent on to bleed with sealing film and hang that to press thick stick be above the sandbox, and with the junction of sandbox body and base plate and the sealing of whole sandbox, with at the bottom of sandbox body, the sandbox with on bleed to hang and press thick stick to be connected with pumped vacuum systems respectively, be evacuated down to the vacuum of needs, can pour into a mould.
D, with foamed material as the part of vacuum sealed molding mould, with the mould overlay film, back-up sand ram-jolt, foamed material can be not originally after the molding, pour into a mould together in company with casting mold, foamed material is burnt by metal liquid and loses the back is replaced the formation foundry goods by metal liquid a part.The foam mould is coated the back as certain part of shaped casting, is combined on the mould behind the vacuum seal overlay film, and back-up sand ram-jolt is poured into a mould together at die cavity during molding, and foamed material is watered by metal liquid and loses the back is replaced the formation foundry goods by metal liquid a part.
Further improvement of the present invention is: among the described step B, before back-up sand, on the top of disappearance mould model, have a position filled and process material of blind hole, groove, and place core iron in the foam interior of groove, on core iron, connect crane barge, after treating resin sand sclerosis, crane barge is fixed on to bleed to hang presses on the thick stick, insert the jolt ramming of pressurizeing less of type stone again.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of sandbox of the present invention;
Fig. 2 is the vertical view of Fig. 1.
Wherein: 1. airway, 2, on bleed and hang the pressure thick stick, 3, last exhaust tube, 4 side airways, 5, side plate, 6, side exhaust tube, 7, end exhaust tube, 8, end airway, 9, base plate, 10. sand control screens.
The specific embodiment
Below in conjunction with the drawings and specific embodiments a kind of casting method that combines with lost foam casting based on vacuum sealed molding of the present invention is further described.
When producing a kind of base of punching press model, its foundry goods appearance and size is 1m * 2m * 6m, and weight is 15 tons, and a plurality of return-enclosures are arranged above the base, forms dowel between the return-enclosure.When adopting founding casing with vacuum, be prefabricated into the real mould consistent with foam with base, real mould generally is that designing unit makes moulding, reach Foundry Works after, swabbing and oven dry on the full mold mould earlier carried out twice altogether; Bury case, vibration molding then, vacuumize after moulding is finished, can pour into a mould.
Wherein the sandbox used of moulding adopts the combined type sandbox of false bottom detachable cap, at the bottom of sandbox comprises sandbox, the sandbox body, on bleed to hang and press thick stick three parts, be arranged at the bottom of the sandbox below the sandbox body, flexibly connect with the sandbox body and work in coordination, at the bottom of the sandbox with around the sandbox body connecting bolt that is connected usefulness is set.Bleed on above the sandbox body being to hang and press thick stick 2.At the bottom of the sandbox, the sandbox body, on bleed to hang to press on the thick stick 2 and be provided with the airway that independently vacuumizes, the appearance and size of sandbox is 1.6mX2.5mX8m.The sandbox body is cubic tube structure, and the sandbox body comprises sandbox side plate 5 and is arranged on the side airway 4 in side plate 5 outsides, is communicated with side exhaust tube 6 on the side airway 4; On bleed to hang and press thick stick to form by the square thick stick of the hollow that is provided with in length and breadth, be the airway 1 that interconnects in the square thick stick, be communicated with exhaust tube 3 on the airway 1; Comprise base plate 9 at the bottom of the sandbox and be arranged on end airway 8 below the base plate, be communicated with end exhaust tube 7 on the end airway 8.At the bottom of the sandbox, the sandbox body, on the distance of hanging between each airway of pressing on the thick stick of bleeding be 1m, sandbox body, moulding plate and on bleed to hang and press the inner wall even distribution of thick stick that aspirating hole is arranged, aspirating hole is communicated with on respectively bleeding, distance between each aspirating hole is 1m, and stainless steel wire sand control screens 10 is set on the aspirating hole.
Utilize the operation of this box moulding to comprise the steps:
1, place a supporting plate on working face, put a tire grillage above the supporting plate, tire grillage height is 200mm, and the end face of the real mould of disappearance mould handled well is placed on the tire grillage down, carries out pouring and riser systems.
2, on the disappearance mould, have blind hole and dark groove position potting resin sand, and put core iron well.
3, sandbox is placed on above the supporting plate, and it is suitably fastening, gradation is inserted molding sand and repeatedly add sand jolt ramming on shake table in sandbox, the amount of inserting of molding sand will exceed sandbox 50mm, the part that molding sand surpasses plane on the sandbox is struck off in jolt ramming later, on sandbox, place at the bottom of the sandbox fastening good bolt then.
4, will spin upside down together with supporting plate at the bottom of sandbox body, the sandbox, make supporting plate at the bottom of cope down, be placed on the shake table, and remove supporting plate and tire grillage.
5, on the top of model, have a position filled and process material of groove, form the cover layer of a foamed material, and, on core iron, connecting iron wire at the inner core iron of making by the leftover bits and pieces of punching press steel plate of placing of the resin sand of return-enclosure, foamed material can harden voluntarily after a period of time.
6, after the foamed material sclerosis, press thick stick to be placed on the sandbox,, will tie up that being fixed on bleeds hangs on the pressure thick stick as the Tie Si Bales of crane barge with also both are fastening good with bolt hanging.
7, the molding sand to the loose position in the sandbox carries out local jolt ramming with special-purpose small-sized vibrations instrument.
8, fill up sandbox with molding sand and make molding sand exceed the about 200mm of sandbox, and hang placement supporting plate and weight on the sand of pressing above the thick stick, pressurization and vibration moulding on shake table last bleeding.
9, be incumbent on to bleed with sealing film and hang that to press thick stick be above the sandbox, and the junction and the whole sandbox of sandbox body and base plate sealed.
10, with at the bottom of sandbox body, the sandbox with on bleed to hang and press thick stick to be connected with pumped vacuum systems respectively, be evacuated down to the vacuum of needs, can pour into a mould.
Above-described embodiment, the present invention specific embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacing all should be included in protection scope of the present invention.
Claims (1)
1. casting method that combines with lost foam casting based on vacuum sealed molding, comprise and bury case, vibration molding, vacuumize operation, it is characterized in that: at the bottom of the sandbox of moulding adopts and comprises sandbox, the sandbox body, on bleed and hang the sandbox of pressing thick stick three parts, each several part to be provided with the airway that independently vacuumizes, its moulding operation also comprises as follows
A, on the supporting plate of horizontal, place tire grillage and disappearance mould model, sandbox,, go up shake table then and add molding sand jolt ramming, wipe the part of molding sand after the jolt ramming off above plane on the case having blind hole, groove position to place core iron and fill with resin sand,
At the bottom of B, the cope, to spin upside down together with supporting plate at the bottom of sandbox body, the sandbox, supporting plate is being descended at the bottom of cope, remove supporting plate and tire grillage, hang the pressure thick stick placing on the sandbox to bleed, fill up sandbox and make molding sand exceed the sandbox certain height with molding sand, weighting material pressurization and vibration moulding on molding sand;
C, be incumbent on to bleed with sealing film and hang that to press thick stick be above the sandbox, and with the junction of sandbox body and base plate and the sealing of whole sandbox, with at the bottom of sandbox body, the sandbox with on bleed to hang and press thick stick to be connected with pumped vacuum systems respectively, be evacuated down to the vacuum of needs, can pour into a mould;
D, with foamed material as the part of vacuum sealed molding mould, with the mould overlay film, back-up sand ram-jolt, foamed material can be not originally after the molding, pour into a mould together in company with casting mold, foamed material is burnt by metal liquid and loses the back is replaced the formation foundry goods by metal liquid a part.The foam mould is coated the back as certain part of shaped casting, is combined on the mould behind the vacuum seal overlay film, and back-up sand ram-jolt is poured into a mould together at die cavity during molding, and foamed material is watered by metal liquid and loses the back is replaced the formation foundry goods by metal liquid a part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011101478534A CN102205395A (en) | 2011-06-03 | 2011-06-03 | Casting method based on vacuum sealed molding combined with lost foam casting |
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| CN2011101478534A CN102205395A (en) | 2011-06-03 | 2011-06-03 | Casting method based on vacuum sealed molding combined with lost foam casting |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203435A (en) * | 2013-05-07 | 2013-07-17 | 泊头市青峰机械有限公司 | Casting sand box |
| CN103212667A (en) * | 2013-03-26 | 2013-07-24 | 山东蒙凌工程机械股份有限公司 | Production process for casting gearbox housing by using V method, and V-method mold |
| CN103506573A (en) * | 2013-09-18 | 2014-01-15 | 宁夏共享集团有限责任公司 | Casting method for complex sand core integrating |
| CN103736926A (en) * | 2013-12-25 | 2014-04-23 | 柳州正菱集团有限公司 | Negative-pressure sand box for evanescent mode |
| CN104148582A (en) * | 2014-08-20 | 2014-11-19 | 无锡柯马机械有限公司 | Evaporative-pattern magnetic mold casting method |
| CN105537523A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Method for casting double-end blind hole part at negative pressure through evanescent mode |
| CN106392010A (en) * | 2016-11-18 | 2017-02-15 | 绥阳县海红铸造有限责任公司 | Technology for lost foam casting |
| CN107096886A (en) * | 2017-03-27 | 2017-08-29 | 六安市龙兴汽车零部件有限公司 | A kind of transmission shell vanishing mould black area process |
| CN107671240A (en) * | 2017-08-30 | 2018-02-09 | 宜兴市金纳利机械制造有限公司 | A kind of full-sized car part lost-foam casting method |
| CN109550889A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | Chief axis evaporative pattern and its method for casting main shaft ram |
| CN111054888A (en) * | 2019-12-30 | 2020-04-24 | 山东汇金股份有限公司 | Method for casting bracket by using local lost foam |
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| 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 |
| CN101844204A (en) * | 2010-05-10 | 2010-09-29 | 泊头市青峰机械有限公司 | Extrusion and vibration molding method for dried sand negative-pressure lost foam casting |
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| CN101554646A (en) * | 2009-04-29 | 2009-10-14 | 刘则斌 | Lost-foam casting process |
| 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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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212667B (en) * | 2013-03-26 | 2016-05-18 | 山东蒙凌工程机械股份有限公司 | Production technology and the V method mould of application V method cast gear box casing |
| CN103212667A (en) * | 2013-03-26 | 2013-07-24 | 山东蒙凌工程机械股份有限公司 | Production process for casting gearbox housing by using V method, and V-method mold |
| CN103203435A (en) * | 2013-05-07 | 2013-07-17 | 泊头市青峰机械有限公司 | Casting sand box |
| CN103203435B (en) * | 2013-05-07 | 2015-05-20 | 泊头市青峰机械有限公司 | Casting sand box |
| CN103506573A (en) * | 2013-09-18 | 2014-01-15 | 宁夏共享集团有限责任公司 | Casting method for complex sand core integrating |
| CN103506573B (en) * | 2013-09-18 | 2015-06-24 | 宁夏共享集团有限责任公司 | Casting method for complex sand core integrating |
| CN103736926A (en) * | 2013-12-25 | 2014-04-23 | 柳州正菱集团有限公司 | Negative-pressure sand box for evanescent mode |
| CN103736926B (en) * | 2013-12-25 | 2016-06-08 | 柳州正菱集团有限公司 | Negative pressure evanescent mold sand box |
| CN104148582A (en) * | 2014-08-20 | 2014-11-19 | 无锡柯马机械有限公司 | Evaporative-pattern magnetic mold casting method |
| CN105537523A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Method for casting double-end blind hole part at negative pressure through evanescent mode |
| CN106392010A (en) * | 2016-11-18 | 2017-02-15 | 绥阳县海红铸造有限责任公司 | Technology for lost foam casting |
| CN106392010B (en) * | 2016-11-18 | 2018-05-18 | 绥阳县海红铸造有限责任公司 | The technique of lost foam casting |
| CN107096886A (en) * | 2017-03-27 | 2017-08-29 | 六安市龙兴汽车零部件有限公司 | A kind of transmission shell vanishing mould black area process |
| CN107671240A (en) * | 2017-08-30 | 2018-02-09 | 宜兴市金纳利机械制造有限公司 | A kind of full-sized car part lost-foam casting method |
| CN109550889A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | Chief axis evaporative pattern and its method for casting main shaft ram |
| CN111054888A (en) * | 2019-12-30 | 2020-04-24 | 山东汇金股份有限公司 | Method for casting bracket by using local lost foam |
| CN111054888B (en) * | 2019-12-30 | 2021-07-06 | 山东汇金股份有限公司 | Method for casting bracket by using local lost foam |
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Application publication date: 20111005 |