CN203495140U - Negative-pressure casting system of coated sand mould - Google Patents
Negative-pressure casting system of coated sand mould Download PDFInfo
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- CN203495140U CN203495140U CN201320392458.7U CN201320392458U CN203495140U CN 203495140 U CN203495140 U CN 203495140U CN 201320392458 U CN201320392458 U CN 201320392458U CN 203495140 U CN203495140 U CN 203495140U
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Abstract
The utility model belongs to the field of casting of coated sand moulds, and specifically relates to a negative-pressure casting system of a coated sand mould for casting micro-pieces such as microspheres. The working process of the casting system comprises the following steps: placing the coated sand mould in a sand body and burying by sand, wherein an air isolation layer is arranged in the opening of the sand body and a sprue gate of the coated sand mould penetrates through the air isolation layer and is exposed above the air isolation layer; and casting molten steel and carrying out negative pressure air exhaust on the inner part of the sand box, wherein the inner cavity of the sand box is communicated with a vacuumizing unit for carrying out the negative pressure air exhaust through an air exhaust pipeline. Through the casting manner, the damage of casting waste gases and flames to surrounding workers can be extremely reduced and even avoided, and the system is extremely high in work efficiency and high in product yield.
Description
Technical field
The utility model belongs to precoated sand mold casting field, is specifically related to a kind of negative pressure of vacuum running gate system for microballoon overlay film sand mold.
Background technology
At present, traditional precoated sand mold casting for small productions such as microballoons, main employing buried husky pouring type; First which need make for the overlay film sand mold as product die cavity (being also core), be the densely covered semicircular cavities a of upper and lower opposed platy structure and one lateral plates, the upper and lower plates matched moulds of overlay film sand mold encloses and forms a plurality of spherical die cavities, between each semicircular cavities a, arrange connection each other for connecting the molten steel runner c of main running channel b, as Figure 1-3, again the overlay film sand mold list group after its matched moulds is imbedded in common external form sand afterwards; During cast, by molten steel, enter main running channel b, via molten steel runner c, flow in each spherical die cavity successively again, its common external form sand corresponding assurance is poured into a mould and insulation operation for the auxiliary sizing of its core, finally utilize the high accuracy of the die cavity of core own and the insulation styling of common external form sand, thereby reach its high quality of finished demand.Pay attention to day by day in country to environmental protection, the increasingly stringent that legislations of environmental protection is controlled, to improving constantly of " three wastes " emission request, and today that the strict control of high energy consumption enterprise is become day by day to enterprise development restriction, the defect that the above-mentioned mode of production exists is also further apparent: first, high warm nature due to pour steel itself, when actual production is poured into a mould, the inevitable high temperature melt phenomenon existing on the part contacting with molten steel of overlay film sand mold of being made by resin, the sharp aroma of its generation and flame are along its molten steel runner ascension, thereby generate excitant pernicious gas and the high temperature flare with strong sharp aroma at its place, sprue gate, not only operating personnel's healthy generation is greatly damaged, also surrounding environment is had a negative impact, secondly, fine and closely woven property and complexity due to overlay film sand mold inner chamber place molten steel runner, in casting process, often cause its cast waste gas from overlay film sand mold, not discharge completely and timely, be easy to produce air bound phenomenon, in addition, fine and closely woven the arranging of its molten steel runner also had influence on the mobility of molten steel itself greatly, thereby cause molten steel fully not fill die cavity, cause waste product to produce in a large number, affect its rate that manufactures a finished product, again, existing precoated sand moulding enterprise is for guaranteeing its yield rate, the direct pouring operation modes of single group overlay film sand mold that adopt more, not only labour intensity is large, also causes the reduction of its finished product efficiency, must constantly guarantee in addition the temperature uniformity of molten steel in stove, to meet a plurality of casting mold demands, this just must heat always, causes electric furnace constant temperature time long, and the consumption of electric energy is very big, finally, because existing placingJi Shu is, rely on the mobility of molten steel self to guarantee that it is full of each inner chamber place of overlay film sand mold, cause its duration of pouring long, the production cycle is long, thereby has affected greatly the economic benefit of enterprise.
Summary of the invention
The purpose of this utility model is to provide a kind of running gate system of applying above-mentioned pouring procedure, and its working stability is reliable and production efficiency is high.
For achieving the above object, the utility model has adopted following technical scheme: a kind of device of applying above-mentioned pouring procedure, comprise sandbox and for carrying out the vacuum unit of negative pressure ventilation operation, and between sandbox inner chamber and vacuum unit, by pump-line, be communicated with.
Major advantage of the present utility model is: abandoned traditional mode of directly burying husky cast, by semiclosed and even totally-enclosed sandbox is set, in cast, realize the inner vacuum pumping of sandbox, one side is poured into a mould waste gas by exhaust pipe and thermal-flame is taken operating space out of, thereby reduces greatly until avoided cast waste gas and produced flame for personnel's harm around; In addition, because negative pressure ventilation operates, thereby reach the object of consolidation sand mold, can make its whole die cavity in casting process can not expand distortion, to guarantee its product quality, promote the precision of its cast product; On the other hand, vacuum-assist pouring is taken gas the subnormal ambient of portion's formation within it in sandbox away, covert increase the flow velocity of molten steel, thereby realize it and fill rapidly type object, effectively avoid the shrinkage porosite of foundry goods, contract sky, air bound etc., not only improved product yield ratio, simultaneously because the mobility of molten steel itself is stronger, the synchronous once-cast that can correspondingly carry out organizing for one case overlay film sand mold, has guaranteed its actual operating efficiency greatly.
Accompanying drawing explanation
Fig. 1 is the front cavity structure schematic diagram of overlay film sand mold upper plate of the present utility model;
Fig. 2 is the I part partial enlarged drawing of Fig. 1;
Fig. 3 is that the upper and lower plates of overlay film sand mold of the present utility model coordinates schematic diagram
Fig. 4 is sandbox working state structure schematic diagram;
Fig. 5 is workflow diagram of the present utility model.
The specific embodiment
An overlay film sand mold vacuum-assist pouring system, comprises sandbox 10 and for carrying out the vacuum unit 20 of negative pressure ventilation operation, sandbox 10 inner chambers are communicated with by pump-line with 20 of vacuum unit.Described vacuum unit 20 is vavuum pump, and its negative pressure ventilation end is communicated to sandbox 10 bottom face places.
System also comprises that described pressure control unit 30 is positioned on pump-line for regulating the pressure control unit 30 of sandbox 10 internal pressures.
System also comprises for filtering the filtration, purification unit of the rear gas of the operation of bleeding and flame.
Filtration, purification unit is two groups, comprise be arranged in pressure control unit 30 and take out the first filtration, purification unit 41 on one section of pump-line of 20 of vacuum unit and be positioned at vacuum unit 20 and its exhaust outlet between the second filtration, purification unit 42, filtration, purification unit is water tank with strainer, filtration, purification unit profile is airtight tubular, comprise and be positioned at the inlet end below water layer and be opened in its outlet side more than water layer, the first filtration, purification unit 41 inlet ends are communicated with pressure control unit 30 ports of export, the second filtration, purification unit 42 inlet ends are communicated with vacuum unit 20 port of export settings.
Form and place sand grains in the first filtration, purification unit 41 water tank with strainer, the water surface is higher than sand face, and gas exhaust end is arranged in underwater or shallow embedding in sand grains.
Below in conjunction with pouring procedure, the utility model is further described.
As shown in Figure 4, for guaranteeing the isolation effect of air barrier, air barrier comprises plastic sheeting, and it is husky that film upper strata covers press mold; Because negative pressure ventilation operation of the present utility model is only for making the interior formation subnormal ambient of sandbox 10, to guarantee effective discharge of its internal waste gas and flame, therefore, the negative pressure ventilation end of its sandbox 10 is positioned at a wherein inwall wall place of sandbox, certainly, during actual use, the arrangement of its negative pressure ventilation end or can be above-mentioned facecloth interposed structure, also can the multiaspect arrangement around its casing, with its negative pressure of vacuum of more effective assurance effect of bleeding, its actual arrangement can be determined according to on-site situation, just repeats no longer one by one herein.
Further, be to guarantee that the utility model is for the innocuousness of surrounding environment, guarantee that environmental protectionization of the present utility model produces, the gas after negative pressure ventilation operation and flame are disposed in extraneous air after via filtration, purification.Meanwhile, because the external form sand in sandbox 10 fills type mode, be all chosen as the dry sand such as olivine sand and fill type mode, therefore, its sandbox 10 is chosen as waste heat and naturally anneals, to reduce its operation and to reduce its executory cost, annealing time is preferably 24 hours, and reality can be determined according to on-site situation.
While watering under the sprue gate of molten steel by sandbox 10 places, top, vacuum unit 20 is started working, the negative pressure ventilation end that is positioned at sandbox 10 lower ends extracts sandbox 10 air, thereby guarantee that sandbox 10 inside are all the time in negative pressure state, by taking out, pressure is poured into a mould waste gas and thermal-flame is taken operating space out of on the one hand, thereby reduces greatly until avoided cast waste gas and produced flame for personnel's harm around; In addition, because negative pressure ventilation operates, thereby reach the object of part consolidation sand mold, can make the whole die cavity of its overlay film sand mold in casting process can not expand distortion, to guarantee its product quality, promote the precision of its cast product; On the other hand, vacuum unit 20 is worked and is made the interior formation subnormal ambient of sandbox 10, also covert increase the flow velocity of molten steel, thereby realize it and fill rapidly type object, effectively avoid shrinkage porosite, contracting sky, the air bound etc. of foundry goods, not only guaranteed its actual operating efficiency, its finished product rate is greatly improved.
Further, as shown in Figure 5, why adopt above-mentioned pressure control unit 30, be the complexity of considering that it uses site environment, sandbox 10 internal pressure sizes also should be according to the situation corresponding, and the speed of evacuation is excessive, the interior vacuum of sandbox 10 is excessive, the high velocity flow that causes its inner molten steel, causes molten steel cooling too early, affects on the contrary its effective casting performance; Once and the speed of evacuation is too small, cast waste gas and thermal-flame that pouring molten steel produces cannot be taken away in time, certainly will scald and burn the film that is positioned at sandbox 10 oral areas, thereby the air-tightness of its casing is damaged after its waste gas and flame ascension.The utility model adopts above-mentioned pressure control unit 30, thereby rely on pressure control unit 30 for the regulating action of pump-line internal pressure, guarantee that sandbox 10 inside are all the time within the scope of optimum pressure value, guaranteed that sandbox 10 air pressure inside both can normally realize effectively detaching of waste gas and flame, and don't the mobility of destruction molten steel itself, and then promote its operating efficiency and finished product rate.
Like this, when vacuum pump work and while extracting the interior waste gas of sandbox 10 and thermal-flame, first its waste gas and thermal-flame enter in the first filtration, purification unit 41 and tentatively filter via pump-line, once cannot filter waste gas completely and again via the second filtration, purification unit 42, carry out secondary filter, after its filtration of final assurance, gas meets enterprise's qualified discharge demand, avoid pouring into a mould waste gas and produce flame for the harm of personnel and environment around, specifically with reference to shown in Fig. 5.
In the water tank with strainer of the first filtration, purification unit 41, place sand grains, polymeric adsorbent and carefully dirt particulate effectively, they are deposited on sand grains effectively, and filtered water can also be implemented recycling like this, and the fine ash being deposited on sand grains is convenient to process.
For ease of explanation, in conjunction with Fig. 1-4, the utility model workflow is set forth as follows herein:
(1), casting
Before a, casting, with suspension hook, discharge the sandbox 10 that overlay film sand mold A and outer molding sand E are housed, at sandbox 10 upper end oral areas, spread plastic sheeting B, and on film B, repave one deck for the protection of the husky C of press mold of film B.
B, will between sandbox 10, vavuum pump, pressure control unit 30 and water tank with strainer, by exhaust pipe D, connect successively, start vavuum pump, by the pressure of the control valve bleeding regulating pipeline D on pressure control unit 30.(note: now pressure control intensity is unsuitable excessive or too small, excessive air stream rapidly can too early cooling molten steel; Too small suction can not reach the object of the flame of effectively bleeding not, and concrete numerical value is determined according to actual conditions, and the general larger numerical value of foundry goods is larger; Arrow points shown in Fig. 4-5 is seen in the path that detaches of its waste gas and flame.）
When C, casting, molten steel injects the overlay film sand mold A inner chamber that is positioned at sandbox 10 via sprue gate, under the traction of sandbox 10 internal negative pressures, and molten steel Fast Filling sandbox; Simultaneously, overlay film sand mold A touches molten steel and the high-temp waste gas that produces and flame see through the husky gap of external form and takes away along the negative pressure of vacuum end that is positioned at sandbox 10 lower ends, its high-temp waste gas and flame, successively by pressure control unit 30 and water tank with strainer, are discharged after purifying via water tank with strainer multistage.
(2), annealing naturally
The sandbox 10 that preorder has been cast, indoor placement is carried out waste heat for 24 hours and is naturally annealed.
(3), husky processing
To external form, husky E reclaims, to recycle, cost-saving.
Claims (3)
1. an overlay film sand mold vacuum-assist pouring system, is characterized in that: comprise sandbox (10) and for carrying out the vacuum unit (20) of negative pressure ventilation operation, between sandbox (10) inner chamber and vacuum unit (20), by pump-line, be communicated with; Described vacuum unit (20) is vavuum pump, and its negative pressure ventilation end is communicated to sandbox (10) bottom face place; Device also comprises that described pressure control unit (30) is positioned on pump-line for regulating the pressure control unit (30) of sandbox (10) internal pressure; Device also comprises for filtering the filtration, purification unit of the rear gas of the operation of bleeding and flame.
2. running gate system according to claim 1, it is characterized in that: filtration, purification unit is two groups, comprise and be arranged in pressure control unit (30) and take out the first filtration, purification unit (41) on one section of pump-line between vacuum unit (20) and be positioned at the second filtration, purification unit (42) between vacuum unit (20) and its exhaust outlet, filtration, purification unit is water tank with strainer, filtration, purification unit profile is airtight tubular, comprise and be positioned at the inlet end below water layer and be opened in its outlet side more than water layer, the first filtration, purification unit (41) inlet end is communicated with pressure control unit (30) port of export, the second filtration, purification unit (42) inlet end is communicated with vacuum unit (20) port of export setting.
3. running gate system according to claim 2, is characterized in that: form and in the first filtration, purification unit (41) water tank with strainer, place sand grains, the water surface is higher than sand face, and gas exhaust end is arranged in underwater or shallow embedding in sand grains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320392458.7U CN203495140U (en) | 2013-07-03 | 2013-07-03 | Negative-pressure casting system of coated sand mould |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320392458.7U CN203495140U (en) | 2013-07-03 | 2013-07-03 | Negative-pressure casting system of coated sand mould |
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| CN203495140U true CN203495140U (en) | 2014-03-26 |
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| CN201320392458.7U Withdrawn - After Issue CN203495140U (en) | 2013-07-03 | 2013-07-03 | Negative-pressure casting system of coated sand mould |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341592A (en) * | 2013-07-03 | 2013-10-09 | 黄山泰鑫耐磨材料有限公司 | Laminating sand mould vacuum-assist pouring method and system |
| CN104493127A (en) * | 2014-12-18 | 2015-04-08 | 李杰红 | Die-cast molten aluminum alloy filter plant |
| CN106077471A (en) * | 2016-07-20 | 2016-11-09 | 长葛市鑫磊机械有限公司 | Automatically form the cast case of negative pressure |
| CN111545708A (en) * | 2020-05-12 | 2020-08-18 | 唐山昊中科技有限公司 | Negative-pressure casting process for precoated sand shell type iron sand |
| CN112916848A (en) * | 2021-01-26 | 2021-06-08 | 康硕(山西)智能制造有限公司 | Aluminum alloy lost foam casting system |
| CN114558996A (en) * | 2022-02-28 | 2022-05-31 | 福建新佳鑫实业有限公司 | Casting auxiliary assembly of lost foam casting equipment |
-
2013
- 2013-07-03 CN CN201320392458.7U patent/CN203495140U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341592A (en) * | 2013-07-03 | 2013-10-09 | 黄山泰鑫耐磨材料有限公司 | Laminating sand mould vacuum-assist pouring method and system |
| CN104493127A (en) * | 2014-12-18 | 2015-04-08 | 李杰红 | Die-cast molten aluminum alloy filter plant |
| CN104493127B (en) * | 2014-12-18 | 2017-12-19 | 绍兴柯桥恒松针纺有限公司 | A kind of filter of pack alloy liquid |
| CN106077471A (en) * | 2016-07-20 | 2016-11-09 | 长葛市鑫磊机械有限公司 | Automatically form the cast case of negative pressure |
| CN111545708A (en) * | 2020-05-12 | 2020-08-18 | 唐山昊中科技有限公司 | Negative-pressure casting process for precoated sand shell type iron sand |
| CN112916848A (en) * | 2021-01-26 | 2021-06-08 | 康硕(山西)智能制造有限公司 | Aluminum alloy lost foam casting system |
| CN114558996A (en) * | 2022-02-28 | 2022-05-31 | 福建新佳鑫实业有限公司 | Casting auxiliary assembly of lost foam casting equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HUANGSHAN ZHONGFA WEAR RESISTANT MATERIAL CO., LTD Free format text: FORMER OWNER: HUANGSHAN TAIXIN WEAR RESISTANT MATERIAL CO., LTD. Effective date: 20150909 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150909 Address after: 245700 Mount Huangshan Industrial Park, Anhui, Huangshan City Patentee after: HUANGSHAN ZHONGFA WEAR-RESISTANT MATERIALS CO., LTD. Address before: 245700 Industrial Park, Mount Huangshan District, Anhui, Huangshan City Patentee before: Huangshan Taixin Wear-resistant Material Co., Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140326 Effective date of abandoning: 20151209 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140326 Effective date of abandoning: 20151209 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |