CN201596759U - Double-crucible low pressure casting machine - Google Patents
Double-crucible low pressure casting machine Download PDFInfo
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- CN201596759U CN201596759U CN2009202199103U CN200920219910U CN201596759U CN 201596759 U CN201596759 U CN 201596759U CN 2009202199103 U CN2009202199103 U CN 2009202199103U CN 200920219910 U CN200920219910 U CN 200920219910U CN 201596759 U CN201596759 U CN 201596759U
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Abstract
The utility model discloses a low pressure casting machine suitable for magnesium alloy casting and production. For overcoming shortages of traditional low pressure casting equipment while reversing advantages of the same, a melting insulation furnace of the low pressure casting machine is separated from the low pressure casting machine, and a low pressure casting machine system is formed by a small casting crucible. The low pressure casting machine mainly comprises a melting insulation furnace (1), a melting insulation crucible (2), a communication pipe (3), a casting crucible (4), a one-way valve (5), a gas inlet pipe (6), a gas release valve (7), a lift tube (8), a casting die (9), a control system (10) and the like, wherein the melting insulation crucible (2) is communicated with the casting crucible (4) through the communication pipe (3), and molten metal inside the melting insulation crucible (2) is controlled by the one-way valve (5) to be intermittently supplied to the casting crucible (4) according to production requirements. The low pressure casting machine used for producing magnesium alloy cast parts has the advantages that firstly, the machine has high filling, increases fluidity of the molten metal, is easy to cast large-sized, complicated and thin-walled parts, contraction of the molten metal in solidification obtains sufficient supplement under pressure, thereby no cavities can be formed inside castings, feeding of the molten metal is carried out under higher pressure, and the castings have compact structures; secondly, the melting insulation crucible stays constantly in normal pressure during production, thereby problems generated in traditional low-pressure casting and counter-pressure casting, in particular to safety problem and alloy melt transfer trouble, cannot occur; thirdly, the crucible furnace can be easily and integrally separated from the low pressure casting machine.
Description
Technical field:
The utility model belongs to the casting machine that a kind of foundry engieering uses, and relates to a kind of bi-crucible low pressure casting machine, is applicable to the especially low pressure casting of Mg alloy castings of alloy liquid.
Technical background
Magnesium alloy cast is present Mg alloy formed main mode.In different magnesium alloy casts, die casting is most widely used, but magnesium alloy die casting generally can not be used for non-key stressed occasion.Low pressure casting can obtain the Mg alloy castings of high-quality.Multiple air injection machine is arranged, most typical traditional barometric-pressure low-pressure casting machine and the up-to-date electromagnetic pump air injection machine of comprising, wherein the barometric-pressure low-pressure casting machine is most widely used general in magnesium alloy cast.The conventional low casting is in the crucible of sealing, feeds dry Compressed Gas, and molten metal is under the effect of gas pressure, rise along stalk, enter die cavity reposefully by cast gate, and keep the gas pressure on the liquid level in the crucible, till foundry goods solidifies fully.Remove the gas pressure on the liquid level then, make that not solidified molten metal flows back to crucible in the stalk, obtain foundry goods.The low pressure casting forming process is simple, and production process consumption is few.Be suitable for producing large, medium and small, various large batch of alloy part.It is more steady that the low pressure casting liquid metals fills type; Casting forming is good, helps forming the foundry goods of clear-cut, any surface finish, and is more favourable for the shaping of large thin wall casting; Foundry goods dense structure, the mechanical performance height; The technology recovery rate of molten metal generally can reach 90%; Working condition is good; Equipment is simple, easily realizes mechanization and automation.
The shortcoming of magnesium alloy low-pressure casting is that alloy liquid is handled trouble.At first will pour the holding furnace crucible into through the molten metal that refining purifies, the molten metal after the sealing replenishes very trouble.For the quantity-produced requirement, reduce unnecessary operation, the crucible volume is generally bigger, to satisfy the long production cycle.In the casting process, general mold filling pressure and change between 0.025-0.05Mpa for boost pressure is 0.075Mpa to the maximum.Because the insulation crucible is in high temperature for a long time, size is big and be subjected to the pressure of alternation, therefore, may ftracture because of crucible, causes the liquid magnesium alloy body drain and goes into high-temperature burner hearth, causes heavy explosion, and therefore, the safety coefficient of magnesium alloy low-pressure casting is lower.The low pressure casting magnesium alloy must adopt inert gas when filling the type operation, and jumbo crucible waste protective gas has improved production cost.Big crucible prolongs the Foundry Production cycle, and in addition, necessary interrupt operation has reduced operating efficiency in the reinforced process.Magnesium alloy cast poor-performing and solidification shrinkage are bigger, conventional low casting fill type and dwell pressure shows little, but since safety problem be difficult to further improve.
Therefore, also can fill the magnesium alloy low-pressure casting of type and pressurize operation by high pressure, need a kind of air injection machine that more meets the characteristics of magnesium alloy for production safety.
Summary of the invention
The purpose of this utility model provides a kind of productivity ratio height, production process is easy and safety, casting quality height, meets the low-pressure die casting plant of magnesium alloy characteristics.
The purpose of this utility model is achieved in that to the shortcoming that overcomes the conventional low Casting Equipment and keeps its advantage, and the melting and heat preservation stove of air injection machine is separated with air injection machine, forms the air injection machine system by a little casting crucible and forms.Main member is by melting and heat preservation stove (1), melting and heat preservation crucible (2), communicating pipe (3), casting crucible (4), check valve (5), air inlet pipe (6), vent valve (7), stalk (8), casting mould (9) and control system formations such as (10), molten metal in the melting and heat preservation crucible (2) is controlled by check valve (5), be communicated with by communicating pipe (3) and casting crucible (4), keep two crucible liquid levels identical.Casting crucible of the present utility model is the bigger low capacity crucible of a kind of wall thickness, can hold the liquid magnesium alloy of one-step casting action need, therefore allows to use higher filling type and dwell pressure and allow to set narrower changes in process parameters scope.The maximum working pressure (MWP) of general casting crucible allows to reach 1.5MPa even higher.Because high pressure energy reaches, reduce the thermal resistance of foundry goods with the die cavity interface, improve setting rate, make the grain refinement of foundry goods, cast properties increases substantially.Fill type and dwell pressure increases substantially, can realize solidifying under the high pressure of Mg alloy castings when permanent mold casting, thereby can obtain fine and close high-quality Mg alloy castings.Release after casting solidification is finished, the not solidifying liq in the stalk falls, one-way valve opens, and the molten metal in the melting and heat preservation crucible enters casting crucible, for next one circulation is prepared.Production process can be added master alloy ingot at any time in the melting and heat preservation crucible, thereby keeps liquid level to be in the par scope, so each casting cycle, and the liquid level of casting crucible all is identical, guarantees to cause the stable of production process technology parameter.
Said process can be made that program finishes automatically in advance by control system.Gas pressure acts on liquid level on the inner chamber of casting crucible (4) when filling type, closed check valve, molten metal along stalk to casting mold crucible (4) filling, supercharging, pressurize, after casting solidification finishes release, not solidifying liq in the stalk (8) falls, check valve (5) is opened, molten metal in the melting and heat preservation crucible (2) enters casting crucible (4), for next one circulation is prepared.Melting and heat preservation crucible (2) is in open state all the time, can add molten metal or furnace charge as required at any time, because melting and heat preservation crucible (2) is not subjected to huge cycle bulge pressure, the danger of leakage reduces greatly, and improve service life.Casting process fills the type power operation and is limited in the little casting crucible (4).On the one hand, shortened Compressed Gas and be full of the time of ullage space and save production cost, thereby improved material productivity ratio and reduce production costs.Monkey is not easy leakage, even if leakage also is unlikely to cause big accident.Allow to use higher type and the dwell pressure of filling, help producing more complicated parts and obtain finer and close foundry goods.The casting crucible of low capacity (4) shortens casting cycle, and productivity ratio improves.
The advantage that casting machine of the present utility model has is simple in structure, cheap and easy to maintenance, can finish pouring operation automatically.Use the utility model device fabrication magnesium alloy cast part, can reach following effect: the first, the higher flowability of filling type, raising molten metal, casting large-scale, complexity, thin-walled parts easily; Being contracted in when solidifying obtains fully additional under the pressure, thereby can not form the cavity in foundry goods, simultaneously because the feeding of molten metal is to carry out at higher pressure, and the THE STRUCTURE OF CASTINGS densification.The second, production process melting and heat preservation crucible is in normal pressure all the time, conventional low casting and variety of issue, the especially safety problem of counter-pressure casting generation and the trouble of alloy liquid metaideophone therefore can not occur.The 3rd, easily the overall separation of crucible furnace, make operation greatly simplify and improve functional reliability and productivity ratio with air injection machine.The 4th, the production process technology parameter stability has well overcome the conventional low casting machine because the product stability relatively poor problem that exists during magnesium alloy.
Casting crucible (4) is the bigger low capacity crucible of a kind of wall thickness, the liquid magnesium alloy that can hold the one-step casting action need, the capacity of casting crucible (4) changes according to the specifications and models difference of required product, and for car hub, the capacity of casting crucible (4) is generally at 20～25 kilograms.Therefore allow to use with respect to higher the filling type and dwell pressure and allow to set narrower changes in process parameters scope of traditional low pressure casting.The maximum working pressure (MWP) of general casting crucible (4) allows to reach 1.5MPa even higher.Because high pressure energy arrives, therefore can reduce the thermal resistance of foundry goods with the die cavity interface, improve setting rate, make the grain refinement of foundry goods, cast properties increases substantially.Fill type and dwell pressure increases substantially, can realize solidifying under the high pressure of Mg alloy castings when permanent mold casting, thereby can obtain fine and close high-quality Mg alloy castings.Production process can be added master alloy ingot at any time in melting and heat preservation crucible (2), thereby keeps liquid level to be in the par scope, and the liquid level of melting and heat preservation crucible (2) and casting crucible (4) all is identical, guarantees to cause the stable of production process technology parameter.General low pressure casting, because liquid level constantly descends with production process in the crucible, foundry goods can not keep a fixing casting parameter, the also product of impossible quality of production unanimity.
In addition, the utility model is not because melting and heat preservation crucible (2) is subjected to huge cycle bulge pressure, and the danger of leakage reduces greatly, and improve service life.Casting process fills the type power operation and is limited in the littler casting crucible (4) of relative conventional low casting, and monkey is not easy leakage and causes big accident.On the other hand, shortened Compressed Gas and be full of the time of ullage space and save production cost, thereby improved material productivity ratio and reduce production costs; Shortened the casting cycle of each part, and productivity ratio obviously improves.
The utility model carries out the experiment of multiple magnesium alloy low-pressure casting part, and operations is functional, index up to specification.The utility model also can be used for the low pressure casting of aluminium alloy.Experimental result shows, the utlity model has simplicity of design, easy to operate, producing cost is low, productivity ratio is high, security performance is good, can be used for producing medium and small Mg alloy castings.Type is steady, freezing pressure is high owing to fill, and the quality of magnesium alloy cast part is improved.The utility model also is used for the low pressure casting of aluminium alloy, and above-mentioned advantage exists equally.
Description of drawings
Fig. 1 bi-crucible low pressure casting machine schematic diagram
1-melting and heat preservation stove, 2-melting and heat preservation crucible, 3-communicating pipe, 4-casting crucible, 5-check valve, 6-air inlet pipe, 7-vent valve, 8-stalk, 9-casting mould, 10-control system
The specific embodiment
Below with reference to accompanying drawings embodiments of the present invention are described.
Melting and heat preservation crucible (1) is communicated with by communicating pipe (3) and casting crucible (4), and the molten metal in the melting and heat preservation crucible (2) need be supplied to casting crucible (4) by producing by check valve (5).High chromium heat resisting steel ball valve of check valve (5), the ball handle is fixed into fork, often is parked in the mouth of pipe under gravity, and the liquid in the melting and heat preservation crucible (2) is under the promotion of gravity, can push steel ball open and in trend casting crucible (4), replenish molten metal, basic identical until two crucible liquid levels.Air inlet pipe (6) is when type is filled in air inlet, and ball valve blocks the mouth of pipe, makes the middle molten metal of casting crucible (4) fill type and process of setting pressurize along stalk (8) to casting mould (9).Release after casting solidification is finished, the not solidifying liq in the stalk falls, check valve (5) is opened, and the molten metal in the melting and heat preservation crucible (2) enters casting crucible (4), for next production cycle is prepared.Said process can make program in advance by control system (10) and finish automatically.
High chromium heat resisting steel ball valve of check valve (5), the ball handle is fixed into fork, often be parked in the mouth of pipe under gravity, but the liquid in the melting and heat preservation crucible (2) is under the promotion of gravity, can push steel ball open and in the trend casting crucible, replenish molten metal, basic identical until amount crucible liquid level, the temperature of the molten metal of melting and heat preservation crucible (2) is about 700 ℃.Air inlet pipe (6) is when type is filled in air inlet, and steel ball valve blocks the mouth of pipe, makes the middle molten metal of casting crucible (4) fill type and process of setting pressurize along stalk (8) to casting mould (9).Casting crucible (4) is the bigger low capacity crucible of a kind of wall thickness, can hold the liquid magnesium alloy of one-step casting action need, therefore allows to use higher filling type and dwell pressure and allow to set narrower changes in process parameters scope.
Two crucibles install at two independently in the resistance furnace respectively.Middle employing interior diameter is that 40 millimeters heat resisting pipe is communicated with.The length of communicating pipe generally is controlled in 1 meter, substantially be equivalent to two heating furnaces near after, the distance of two crucibles, heat-insulation layer was arranged outside communicating pipe, it is that temperature reduces that the placement molten metal flows through, if in particular cases need longer communicating pipe, the outside needs to increase electrically heated attemperator, and is excessive to avoid the molten metal temperature to reduce.The method of casting crucible and communicating pipe employing welding is fixed.Being connected of melting and heat preservation crucible and communicating pipe, then adopt the connection that can tear open, tube connector is sleeved on inside the Pass the lining on the fusion crucible wall, and both gaps are 50% brown iron oxide, 45% alumina powder, 5% boric acid powder mixed powder filling obstruction with composition.Mixed-powder is shutoff magnesium liquid seepage effectively, when needs are taken apart, does not also have difficulties simultaneously.
Two crucible oral areas are in identical horizontal line substantially, and two interior molten metals of crucible also keep identical liquid level in the course of work.In casting process, pass through constantly to add furnace charge, liquid level is remained unchanged, thereby keep the static pressure of molten metal to remain unchanged, at this moment, as long as the gas boosting pressurize when fixing each the casting keeps stable (automation is controlled and is easy to realize), just can keep the repeatability of whole process of production guarantor production technology very accurately.
Embodiment 2
The bi-crucible low pressure casting machine that is used for the magnesium alloy auto hub casting
Certain model magnesium alloy auto hub part net weight adopts the production of combination metal pattern about 8 kilograms, total amount of metal that filling type needs is about 11 kilograms.The structure of bi-crucible low pressure casting machine as shown in Figure 1, melting and heat preservation crucible (2) volume of bathtub shapes is 500 kilograms of liquid magnesium alloy, the centre has dividing plate will melt the chamber to be divided into two-part, the female ingot of production process magnesium alloy adds at melting and heat preservation crucible one end, molten metal after fusing and the intensification slowly moves to the other end of melting and heat preservation crucible, and the communicating pipe 3 of drawing from one end bottom, molten metal is incorporated into casting crucible (4).The casting crucible volume is about 16 kilograms of liquid magnesium alloy, 25 millimeters of casting crucible (4) wall thickness, and maximum working pressure (MWP) 1.5Mpa, casting crucible (4) top seal also is communicated with via stalk (8) and casting mould (9).Low pressure casting die is for the combination metal pattern and unlatching and closed and locked device are arranged.
The reinforced fusing operation of melting and heat preservation crucible (2) needs the basic level change of lubricating in the insulation crucible that guarantees to control a prescribed limit, and will in time claw the burning of slag and prevention magnesium liquid by manually finishing.Casting process and casting parameter make programme-control in advance by control system (10).Fill that type, pressurize, high pressure solidify, casting solidification finish after release, the not solidifying liq in the stalk (8) falls, check valve (5) is opened, molten metal enters casting crucible (4), is that next one circulation is prepared.The operation cycle cycle of producing a wheel hub is about 5 minutes.Owing to fill type and pressurize is carried out at high pressure, reduce the thermal resistance of foundry goods with the die cavity interface, improve setting rate, make the grain refinement of foundry goods, thereby can obtain fine and close high-quality Mg alloy castings.Simultaneously, production process does not exist because the liquid level wide variation causes production process technology parameter instability.Melting and heat preservation crucible (2) is in open state all the time, can add molten metal or furnace charge as required at any time, because melting and heat preservation crucible (2) is not subjected to huge cycle bulge pressure, the danger of leakage reduces greatly, and the life-span is improved.
The utility model carries out the production experiment of magnesium alloy hub, and operations is functional. Experimental result shows, the utlity model has the design productivity ratio higher, security performance is good, the casting of automobile hub that can be used for the production higher quality, the mechanical performance of the magnesium alloy parts of producing increases substantially, and the pore of foundry goods and ardent reduction in propensity, tensile strength on average improve 20%, percentage elongation improves 2%.
The utility model also is used for the low pressure casting of aluminium alloy, possesses equally above-mentioned advantage.
Claims (1)
1. bi-crucible low pressure casting machine that is applicable to magnesium alloy, it is characterized in that by melting and heat preservation stove (1), melting and heat preservation crucible (2), communicating pipe (3), casting crucible (4), check valve (5), air inlet pipe (6), vent valve (7), stalk (8), casting mould (9) and control system formations such as (10), molten metal in the melting and heat preservation crucible (2) is controlled by check valve (5), be communicated with by communicating pipe (3) and casting crucible (4), keep two crucible liquid levels identical.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202199103U CN201596759U (en) | 2009-10-22 | 2009-10-22 | Double-crucible low pressure casting machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202199103U CN201596759U (en) | 2009-10-22 | 2009-10-22 | Double-crucible low pressure casting machine |
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| CN201596759U true CN201596759U (en) | 2010-10-06 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179496A (en) * | 2011-04-25 | 2011-09-14 | 中信戴卡轮毂制造股份有限公司 | Improved double-chamber heat-preservation furnace |
| CN102211170A (en) * | 2011-05-20 | 2011-10-12 | 江苏天宏机械工业有限公司 | Highly turbocharged low pressure die casting machine |
| CN102896300A (en) * | 2012-10-15 | 2013-01-30 | 江苏天宏自动化科技有限公司 | Two-chamber heat preserving furnace for low pressure casting machine |
| CN102962430A (en) * | 2011-08-31 | 2013-03-13 | 广东鸿泰科技股份有限公司 | Low-pressure casting method and device thereof |
| CN103506604A (en) * | 2012-06-25 | 2014-01-15 | 无锡蠡湖叶轮制造有限公司 | Method for casting long-runner thin-wall type box body |
| CN105772681A (en) * | 2016-05-17 | 2016-07-20 | 昆山六丰机械工业有限公司 | Casting equipment for automobile hubs |
| CN106029253A (en) * | 2014-01-29 | 2016-10-12 | Ks华域铝技术有限责任公司 | Device for producing a cylinder crankcase using the low-pressure or gravity casting method |
| CN113798472A (en) * | 2021-09-17 | 2021-12-17 | 大连坤隆铸造有限公司 | Machine part casting forming device and process thereof |
| CN116689735A (en) * | 2023-05-06 | 2023-09-05 | 杭州合立机械有限公司 | Low-pressure casting die and method for manufacturing engine cylinder body |
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2009
- 2009-10-22 CN CN2009202199103U patent/CN201596759U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179496A (en) * | 2011-04-25 | 2011-09-14 | 中信戴卡轮毂制造股份有限公司 | Improved double-chamber heat-preservation furnace |
| CN102211170A (en) * | 2011-05-20 | 2011-10-12 | 江苏天宏机械工业有限公司 | Highly turbocharged low pressure die casting machine |
| CN102962430A (en) * | 2011-08-31 | 2013-03-13 | 广东鸿泰科技股份有限公司 | Low-pressure casting method and device thereof |
| CN103506604A (en) * | 2012-06-25 | 2014-01-15 | 无锡蠡湖叶轮制造有限公司 | Method for casting long-runner thin-wall type box body |
| CN103506604B (en) * | 2012-06-25 | 2015-11-25 | 无锡蠡湖叶轮制造有限公司 | The casting method of long runner thin wall type casing |
| CN102896300A (en) * | 2012-10-15 | 2013-01-30 | 江苏天宏自动化科技有限公司 | Two-chamber heat preserving furnace for low pressure casting machine |
| CN106029253A (en) * | 2014-01-29 | 2016-10-12 | Ks华域铝技术有限责任公司 | Device for producing a cylinder crankcase using the low-pressure or gravity casting method |
| US9718124B2 (en) | 2014-01-29 | 2017-08-01 | Ks Huayu Alutech Gmbh | Device for producing a cylinder crankcase using the low-pressure or gravity casting method |
| CN105772681A (en) * | 2016-05-17 | 2016-07-20 | 昆山六丰机械工业有限公司 | Casting equipment for automobile hubs |
| CN113798472A (en) * | 2021-09-17 | 2021-12-17 | 大连坤隆铸造有限公司 | Machine part casting forming device and process thereof |
| CN113798472B (en) * | 2021-09-17 | 2023-03-28 | 大连坤隆铸造有限公司 | Machine part casting forming device and process thereof |
| CN116689735A (en) * | 2023-05-06 | 2023-09-05 | 杭州合立机械有限公司 | Low-pressure casting die and method for manufacturing engine cylinder body |
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Granted publication date: 20101006 |