CN105268951A - Negative-pressure updraught pouring method - Google Patents
Negative-pressure updraught pouring method Download PDFInfo
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- CN105268951A CN105268951A CN201510060581.2A CN201510060581A CN105268951A CN 105268951 A CN105268951 A CN 105268951A CN 201510060581 A CN201510060581 A CN 201510060581A CN 105268951 A CN105268951 A CN 105268951A
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- molten steel
- mold
- negative pressure
- suction pipe
- calciner
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Abstract
The invention provides a negative-pressure updraught pouring method. Firstly, molten steel is contained in a melting furnace, the top end of the melting furnace is covered with a flat plate with a suction pipe, and the bottom end of the suction pipe extends into the molten steel; secondly, a ventilated casting mold is placed on the flat plate, after a flow passage system of the casting mold is communicated with the top end of the suction pipe, a hood body is arranged above the casting mold and the flat plate in a covering manner, air in the hood body is pumped away, and air pressure in the hood body and mold cavities are lowered; and thirdly, the molten steel in the melting furnace is sucked into the mold cavities through the suction pipe and the flow passage system through negative pressure formed in the hood body, and a casting is formed after being cooled.
Description
Technical field
The present invention is about a kind of pouring procedure, and inspiration on molten steel enters in mold so that the negative pressure forming foundry goods to inhale pouring procedure by espespecially a kind of negative pressure that utilizes.
Background technology
Refer to shown in Fig. 5, the gravity-assist pouring method of existing steel casting factory, mainly with calciner, steel are melted to after 1450 ~ 1700 DEG C, the molten steel of high temperature is contained in metal bucket d, again molten steel is toppled in the mold a being cast in and making in advance, molten steel is allowed to pass through Action of Gravity Field, pond b1, sprue b2 and runner b3 is watered by flow path system b, and flow in die cavity c by water inlet (gate) b4, take out from mold a after molten steel cooled and solidified, through suitable cleaning and processing, required foundry goods can be obtained.
Above-mentioned pouring procedure is mostly used in the casting of iron and steel.Only, based on casting cost and the considering of casting quality, it has following shortcoming:
1., for the thick foundry goods about below 3.5mm of meat, when being watered in sand mo(u)ld by molten steel with Action of Gravity Field, molten steel needs through flow path system.And due to the stop of air in die cavity, the flow velocity of molten steel can not be too fast, and the thick thinner flow velocity of meat is slower, the longer molten steel that will make of stream cools sooner, therefore, if the temperature of molten steel is not high, illiquidity, the thin meat difficult forming of foundry goods will be made, be not easy to cast out excellent product.
2. when melting temperature increase reaches 1700 DEG C, even after higher temperature, although can molten steel flow be increased, with the foundry goods of shaping thin meat, but after melting temperature increases, not only power consumption can be increased, and significantly can shorten the life-span of the refractory material of calciner, allow the replacement frequency of refractory material increase, thus, will refractory material replacement cost be increased and decline because changing the production capacity caused of stopping work.Moreover when molten steel melting temperature is more than 1700 DEG C, the refractory material in calciner can fuse in molten steel, causing molten steel to include oxide impurity increases, and affects purity and the mechanical performance of steel foundry goods.
3., in casting process, molten steel needs to be full of and to comprise flow path systems such as watering pond, sprue and runner, just can flow in die cavity, and molten steel in this flow path system can with the cooled and solidified simultaneously of the molten steel in die cavity.Molten steel is deposited in flow path system and consumes molten steel more, and foundry goods cannot effectively be promoted with the ratio (that is walk stay rate) of always pour into a mould molten steel, and walks and stay rate effectively to promote, and namely cannot save molten steel, effectively cannot save the energy, reduction production cost.
Summary of the invention
In view of this, in order to provide a kind of structure being different from current art, and improve above-mentioned shortcoming, inventor amasss experience for many years and constantly researches and develops improvement, then has generation of the present invention.
An object of the present invention inhales pouring procedure providing in a kind of negative pressure, and when the temperature of the existing molten steel of enable solution is not high, the problem of the foundry goods difficult forming that meat is thin, to meet the product instructions for use of the thin meat of foundry goods.
An object of the present invention inhales pouring procedure, the shortcoming that enable solution existing molten steel melting temperature is too high providing in a kind of negative pressure, to reduce power consumption, to reduce refractory material consume and replacement frequency, raising foundry goods purity, mechanical performance, and can reduce production cost.
An object of the present invention inhales pouring procedure providing in a kind of negative pressure, and the existing too much molten steel of enable solution rests in flow path system, and the problem making step stay rate cannot to promote, to save the cost reclaiming molten steel and make again, and effectively improve output.
An object of the present invention inhales pouring procedure providing in a kind of negative pressure, and the existing pouring procedure of enable solution must carry out the shortcoming of pouring into a mould, without the need to re-using metal bucket and relevant equipment, to reduce production cost with metal bucket.
In order to achieve the above object, a kind of negative pressure set by the present invention inhales pouring procedure, for at least one foundry goods of at least one moldings formed therefrom, wherein, die cavity and the flow path system of connection is provided with in mold, and this negative pressure is inhaled pouring procedure and comprise the following steps: that the flat plate cover with suction pipe is combined in the top of calciner by a., be loaded with the molten steel of melting in this calciner, and the bottom of suction pipe is stretched in molten steel; B. on mold, form the air duct being communicated with die cavity, and mold is placed on flat board, the flow path system of mold is communicated with the top of suction pipe; C. a cover body is covered above mold and flat board, and extract the air in cover body, the air pressure in cover body and die cavity is reduced, upwards extracts the molten steel in calciner via suction pipe, make molten steel flow in die cavity; And d. leaves standstill a period of time, allow the water inlet between flow path system and die cavity solidify, then remove the air negative pressure state in cover body, the molten steel adverse current in flow path system is returned in calciner.
During enforcement, the present invention also comprises a step, after Step d, is removed by cover body, and allows mold and plate isolation.
During enforcement, this mold is sand mo(u)ld, and the air duct on mold is each sand gap of sand mo(u)ld, and in this calciner the temperature of molten liquid steel between 1400 ~ 1550 DEG C.
For understanding the present invention further, below lifting preferred embodiment, coordinating accompanying drawing, figure number, concrete constitution content of the present invention and effect of reaching thereof are described in detail as follows.
Accompanying drawing explanation
Fig. 1 uses by preferred embodiment of the present invention the element exploded view of each element;
Fig. 2 uses by preferred embodiment of the present invention the combination generalized section of each element;
Fig. 3 is the using state figure of preferred embodiment of the present invention when forming negative pressure;
Fig. 4 is the using state figure that the molten steel adverse current of preferred embodiment of the present invention returns calciner;
Fig. 5 is the using state schematic diagram that molten steel is cast in mold by existing sand casting method.
Description of reference numerals:
2: calciner;
3: dull and stereotyped;
4: suction pipe;
5: mold;
51: die cavity;
52: air duct;
53: flow path system;
531: entrance;
54: water inlet;
6: cover body;
61: exhaust tube;
9: molten steel;
A: mold;
B: flow path system;
B1: water pond;
B2: sprue;
B3: runner;
B4: water inlet;
C: die cavity;
D: metal bucket.
Detailed description of the invention
Refer to shown in Fig. 1 to Fig. 4, it is the preferred embodiment of negative pressure of the present invention being inhaled pouring procedure, comprises the following steps:
A. the flat board 3 with suction pipe 4 is covered on the top of calciner 2, be loaded with the molten steel 9 of melting in calciner 2, and the bottom of suction pipe 4 is stretched in molten steel 9.
B. on mold 5, form the air duct 52 being communicated with die cavity 51, and mold 5 is placed on dull and stereotyped 3, the flow path system 53 of mold 5 is communicated with the top of suction pipe 4.
C. cover body 6 is covered above mold 5 and dull and stereotyped 3, and extract the air in cover body 6, the air pressure in cover body 6 and die cavity 51 is reduced, upwards draws the molten steel 9 in calciner 2 via suction pipe 4, molten steel 9 is flowed in die cavity 51 with mould casting.And
D. leave standstill a period of time, allow the water inlet 54 between flow path system 53 and die cavity 51 solidify, then remove the air negative pressure state in cover body 6, molten steel 9 adverse current in flow path system 53 is returned in calciner 2.
Wherein, the calciner 2 of step a is the calciner of coil heats; The melt temperature of molten steel 9 controls between 1400 ~ 1550 DEG C; Suction pipe 4 passes perpendicularly through dull and stereotyped 3, and the bottom end opening of suction pipe 4 stretches in molten steel 9, and the top end opening of suction pipe 4 and the end face outline of dull and stereotyped 3 are in same level.
The mold 5 of step b is sand mo(u)ld, and the air duct 52 on mold 5 is the gap between each sand grains of sand mo(u)ld, for generation permeation functions; The entrance 531 of the flow path system 53 of mold 5 is formed in the bottom surface of mold 5, uses when mold 5 is placed on dull and stereotyped 3, this entrance 531 is alignd the top end opening of suction pipe 4, thus the flow path system 53 of mold 5 is communicated with the top of suction pipe 4.
In step c, this cover body 6 is the hollow container of bottom surface formation opening, the top of cover body 6 connects an exhaust tube 61, use when cover body 6 covers above mold 5 and dull and stereotyped 3, the air in cover body 6 is extracted with vavuum pump, and due to the gas permeability of mold 5, the air pressure in cover body 6 can be made identical with the air pressure in die cavity 51, flow path system 53 and suction pipe 4.Therefore, utilize the molten steel 9 in negative pressure extracting calciner 2, molten steel 9 can be made upwards to flow via suction pipe 4, then flow in die cavity 51 via flow path system 53.During enforcement, this die cavity 51 also can be provided with multiple, with simultaneously shaping multiple foundry goods.
In steps d, after molten steel 9 flows in die cavity 51, first leave standstill a period of time, and the molten steel 9 in die cavity 51 solidifies not yet completely, and the water inlet 54 between flow path system 53 and die cavity 51 is when solidifying, remove the air negative pressure state in cover body 6, the downward adverse current of the molten steel 9 of ot-yet-hardened in flow path system 53 is returned in calciner 2.
After molten steel 9 completely return calciner 2 in by adverse current, cover body 6 is removed, and allows mold 5 be separated with dull and stereotyped 3, make the molten steel 9 in mold 5 continue cooling, then reappose new mold 5 on flat board 3 time, again can carry out pouring practice.
Therefore, the present invention has following advantage:
1, molten steel sucks in die cavity in the mode that negative pressure is inhaled by the present invention, and can make the meat of foundry goods thick reduction below 2.5mm, therefore, for the product having specific demand, can meet the requirement used because of the thin meat of foundry goods.
2, molten steel sucks in die cavity in the mode that negative pressure is inhaled by the present invention, although the temperature of molten steel is between 1400 ~ 1550 DEG C, still can flow smoothly in flow path system, therefore, via the reduction of molten steel melting temperature, not only can reduce power consumption to save the energy, refractory material consume can be reduced and fuse in molten steel, to improve foundry goods purity and mechanical performance, and the replacement frequency that can reduce calciner refractory material is to reduce production cost.
3, the present invention after casting complete, can allow the molten steel adverse current of ot-yet-hardened return in calciner, pours into a mould use to provide next time, therefore, can effectively promote step and stay rate, not only can save the cost that recovery is made again, and can improve output.
4, molten steel sucks in die cavity in the mode that negative pressure is inhaled by the present invention, the melting temperature of molten steel can be reduced, and use shorter flow path system, when the molten steel adverse current of ot-yet-hardened is returned in calciner, not having impurity is blended in molten steel, therefore, the mechanical performance of impurity to steel foundry goods can be avoided to impact.
5, calciner of the present invention is the calciner of coil heats, directly can provide the molten steel of melting, allows suction pipe draw with mould casting, therefore, not only more simple and efficient in cast program, and without the need to re-using metal bucket and relevant equipment, and can production cost be reduced.
In sum, according to content disclosed above, the present invention really can reach the object of expection, there is provided one can not only make the thin meat of foundry goods, reduce production cost, improve output, processing procedure is simple and easy, and the negative pressure can guaranteeing casting quality inhales pouring procedure, has the value that industry utilizes, so propose application for a patent for invention in accordance with the law.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (4)
1. negative pressure inhales a pouring procedure, at least one foundry goods of at least one moldings formed therefrom, be provided with die cavity and the flow path system of connection in this mold, it is characterized in that, this negative pressure inhales pouring procedure and comprises the following steps:
The flat plate cover a. by one with suction pipe is combined in the top of a calciner, is loaded with the molten steel of melting in this calciner, and the bottom of this suction pipe is stretched in this molten steel;
B. on mold, form the air duct being communicated with die cavity, and this mold is placed on this flat board, the flow path system of this mold is communicated with the top of this suction pipe;
C. a cover body is covered above this mold and this flat board, and extract the air in cover body, the air pressure in cover body and die cavity is reduced, upwards draws the molten steel in calciner via this suction pipe, make molten steel flow in die cavity; And
D. leave standstill a period of time, allow the water inlet between flow path system and die cavity solidify, then remove the air negative pressure state in cover body, the molten steel adverse current in flow path system is returned in calciner.
2. negative pressure according to claim 1 inhales pouring procedure, it is characterized in that, this also comprises a step, after Step d, is removed by cover body, and allows mold and plate isolation.
3. negative pressure according to claim 1 inhales pouring procedure, it is characterized in that, this mold is sand mo(u)ld, and this mold upper air passage is the gap of each sand grains of sand mo(u)ld.
4. negative pressure according to claim 1 inhales pouring procedure, it is characterized in that, in this calciner, the temperature of molten liquid steel is between 1400 ~ 1550 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510060581.2A CN105268951A (en) | 2015-02-05 | 2015-02-05 | Negative-pressure updraught pouring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510060581.2A CN105268951A (en) | 2015-02-05 | 2015-02-05 | Negative-pressure updraught pouring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105268951A true CN105268951A (en) | 2016-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510060581.2A Pending CN105268951A (en) | 2015-02-05 | 2015-02-05 | Negative-pressure updraught pouring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110014135A (en) * | 2019-03-20 | 2019-07-16 | 天津新伟祥工业有限公司 | Casting equipment and its method are inhaled in a kind of plasma constant temperature negative pressure |
Citations (7)
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|---|---|---|---|---|
| FR477384A (en) * | 1914-06-12 | |||
| US3410332A (en) * | 1965-06-07 | 1968-11-12 | Amsted Ind Inc | Method and apparatus for casting metals in a controlled atmosphere |
| US3863706A (en) * | 1972-12-04 | 1975-02-04 | Hitchiner Manufacturing Co | Metal casting |
| US4550763A (en) * | 1980-12-11 | 1985-11-05 | Institute Po Metaloznanie I Technologia Na Metalite | Method and machine for pressure diecasting |
| CN88102624A (en) * | 1987-05-07 | 1988-12-14 | 金属铸造技术公司 | The equipment of Countergravity metal casting and method |
| US5355934A (en) * | 1992-07-22 | 1994-10-18 | Toyota Jidosha Kabushiki Kaisha | Low pressure casting apparatus |
| CN1239683A (en) * | 1998-06-22 | 1999-12-29 | 中央精机株式会社 | Suction casting method and suction casting apparatus |
-
2015
- 2015-02-05 CN CN201510060581.2A patent/CN105268951A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR477384A (en) * | 1914-06-12 | |||
| US3410332A (en) * | 1965-06-07 | 1968-11-12 | Amsted Ind Inc | Method and apparatus for casting metals in a controlled atmosphere |
| US3863706A (en) * | 1972-12-04 | 1975-02-04 | Hitchiner Manufacturing Co | Metal casting |
| US4550763A (en) * | 1980-12-11 | 1985-11-05 | Institute Po Metaloznanie I Technologia Na Metalite | Method and machine for pressure diecasting |
| CN88102624A (en) * | 1987-05-07 | 1988-12-14 | 金属铸造技术公司 | The equipment of Countergravity metal casting and method |
| US5355934A (en) * | 1992-07-22 | 1994-10-18 | Toyota Jidosha Kabushiki Kaisha | Low pressure casting apparatus |
| CN1239683A (en) * | 1998-06-22 | 1999-12-29 | 中央精机株式会社 | Suction casting method and suction casting apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110014135A (en) * | 2019-03-20 | 2019-07-16 | 天津新伟祥工业有限公司 | Casting equipment and its method are inhaled in a kind of plasma constant temperature negative pressure |
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Application publication date: 20160127 |