CN103785813A - Vacuum standing degassing and deslagging device of low-pressure casting heat-insulation furnace and deslagging method for vacuum standing degassing and deslagging device - Google Patents
Vacuum standing degassing and deslagging device of low-pressure casting heat-insulation furnace and deslagging method for vacuum standing degassing and deslagging device Download PDFInfo
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Abstract
The invention provides a vacuum standing degassing and deslagging device of a low-pressure casting heat-insulation furnace and a deslagging method for the vacuum standing degassing and deslagging device. The vacuum standing degassing and deslagging device comprises a heat-insulation furnace and a vacuum-pumping system, wherein the vacuum-pumping system comprises a cooling device and a vacuum pump; the heat-insulation furnace is connected with the cooling device; and the cooling device is connected with the vacuum pump. During operation of the device, a three-way valve rotates, when the three-way valve rotates to a vacuum joint, the vacuum pump is started, vacuum pumping is performed on the heat-insulation furnace, at the moment, partial pressure of hydrogen in a furnace cavity is reduced, and the hydrogen in aluminum alloy melt is continuously separated out, so that the content of the hydrogen in the melt is reduced; and after the state is kept for a certain time, a vacuum state is released, the three-way valve rotates to a compressed air joint, and then casting can be performed. A hydrogen removal and deslagging effect is high, the problem that the content of hydrogen and the quantity of oxidation slag are obviously increased in an aluminum melt transfer process during low-pressure casting of aluminum alloy is solved, and the scrappage of castings is reduced. Moreover, the vacuum standing degassing and deslagging device is simple in structure and easy to operate.
Description
Technical field
The invention belongs to casting alloy melting and Casting Equipment field, relate to a kind of vacuum standing, gas removal deslagging device and deslagging method thereof of low-pressure casting thermal insulation furnace.
Background technology
Aluminium alloy has that density is little, specific strength is high, easy shaping etc. a little, be widely used in the fields such as Aero-Space, communications and transportation, machinery.In aluminium alloy production process, especially in aluminium ingot preparation, foundry goods manufacture process, can produce a large amount of hole defects, cause the performance of aluminium ingot or aluminium alloy castings, particularly mechanical property, significantly decline or even scrap, causing yield rate low, energy waste is large.Research shows, the main cause that causes aluminium alloy hole is the existence of hydrogen and oxide inclusion in melt.The solubility of hydrogen in solid aluminum is very little is 0.034ml/100gAl, and very greatly 0.65ml/100gAl of solubility in liquid aluminium, this huge dissolubility difference makes hydrogen in process of setting assemble in a large number in solid liquid interface forward position.Owing to not overflowing from melt completely, oversaturated hydrogen is easy to rely on being mingled with forming core and growing up formation hole defect in melt.Thereby to produce fine aluminum alloy-steel casting and must carry out cleaning molten processing.
Traditional cleaning molten is mainly adsorption cleaning, and adsorption cleaning refers to and relies on the suction-operated of refining agent to remove gas in aluminium liquid and the object of field trash.Mainly comprise: filtration method, flux method and the bubble method of swimming.Refinery practice for to add refining agent (flux), as C in melt
2cl
6, JDLF-1 etc., but can be to environment, harmful to operating personnel, and easily introduce new impurity, efficiency is low; Or by rotary blowing inert gas, nitrogen, but effect is stable not, when the bubble size passing into greatly or bubble is closed in generation, effect is bad, the gas dehumidification passing into can increase hole defect not on the contrary, especially while passing into nitrogen, the improper meeting of temperature control reacts with aluminum melt, contaminated melt on the contrary.The dehydrogenation of vacuum settled process is a kind of non-method for adsorbing and purifying, is based on Henry's law, and aluminium alloy melt surface is vacuumized, reduce hydrogen dividing potential drop, its solubility in aluminium alloy melt reduced and carry out dehydrogenation, generally, in the time of 10mmHg vacuum, hydrogen can reduce to 0.1ml/100gAl.On the other hand, when vacuum leaves standstill, a large amount of bubble hydrogen floatings that produce in aluminum melt also can be taken away non-metallic inclusion, make aluminium melt purifying.
But aluminium liquid stream contacts, in crucible, rolls with air fierceness when adopting traditional flux method and being transported in air injection machine crucible after bubble method purified treatment, cause Hydrogen Content in Molten Aluminum content and oxide slag inclusion amount significantly to be gone up, substantial loss the effect of cleaning molten processing in early stage, thereby easily cause producing hole defect in foundry goods and scrap.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of vacuum standing, gas removal deslagging device and deslagging method thereof of low-pressure casting thermal insulation furnace are provided, it has very strong dehydrogenation slagging-off effect, the hydrogen content and the significantly problem of rise of oxide slag inclusion amount that in aluminum alloy low-pressure casting, in aluminum melt transport process, produce are solved, reduce the scrappage of foundry goods, and simple in structure, easily operation.
In order to solve the problems of the technologies described above, technical scheme provided by the invention is:
A vacuum standing, gas removal deslagging device for low-pressure casting thermal insulation furnace, comprises holding furnace and pumped vacuum systems, and described pumped vacuum systems comprises cooling device and vavuum pump, and described holding furnace is connected with cooling device, and cooling device is connected successively with vavuum pump;
Described holding furnace is provided with compressed air joint; Described pumped vacuum systems comprises vacuum adapter, cooling device, vavuum pump, between described pumped vacuum systems and pumped vacuum systems, be provided with triple valve, the first opening of described triple valve is connected with compressed air joint, and the second opening is connected with one end of vacuum adapter, and the 3rd opening is connected with nitrogen cylinder; The described vacuum adapter other end is connected with cooling device by vacuum quick release flange; Between described cooling device and vavuum pump, be connected by rubber hose, described rubber hose is provided with vacuum pumping valve and vacuum-breaking valve; Described holding furnace comprises the crucible being arranged in holding furnace, in described holding furnace, is provided with stalk, and holding furnace is stretched out on described stalk top, and the part that stalk stretches out holding furnace is provided with bell, and self sealss briquetting is installed on described bell;
Described cooling device comprises cooling bath and cooling tube, and described cooling tube one end is connected with vacuum adapter, and the other end is connected with rubber hose; Described cooling tube is placed in cooling bath, in described cooling bath, is loaded with cooling fluid;
Described cooling tube is arranged to helical form;
Between the lower surface of described self sealss briquetting and bell, embed high-temperature resistant seal ring;
Described pumped vacuum systems is placed on plate pusher.
Another technical purpose of the present invention is to provide a kind of deslagging method based on said apparatus, when operation, swivel tee valve, in the time of triple valve rotation direction vacuum adapter, open vavuum pump, holding furnace is vacuumized, and now in furnace chamber, the dividing potential drop of hydrogen reduces, and the hydrogen in aluminium alloy melt can constantly be separated out, thereby the hydrogen content in reduction melt, keep removing vacuum after certain hour, triple valve rotation direction compressed air joint, can cast.
By above technical scheme, with respect to prior art, the present invention has following beneficial effect:
Between the lower surface of sealing block and bell, embed high-temperature resistant seal ring, rely on the briquetting deadweight of self sealss briquetting to be pressed on bell, better seal body of heater; Operate by swivel tee valve, in the time of triple valve rotation direction vacuum adapter, open vavuum pump, holding furnace is vacuumized, and now in furnace chamber, the dividing potential drop of hydrogen reduces, and the hydrogen in aluminium alloy melt can constantly be separated out, thereby the hydrogen content in reduction melt, keep removing vacuum after certain hour, triple valve rotation direction compressed air joint, can cast; The present invention is not only simple in structure, and easily, device of the present invention is applicable to easily to form the melt preparation of the aluminium alloy castings that hole or air-tightness have relatively high expectations simultaneously in operation, makes without use refining agent producing, pollution-free.
Accompanying drawing explanation
Figure 1 shows that structural representation of the present invention;
Wherein: 1 is holding furnace, 2 is crucible, and 3 is stalk, and 4 is bell, and 5 is triple valve, 6 is self sealss briquetting, and 7 is vacuum adapter, and 8 is vacuum quick release flange, and 9 is vacuum pumping valve, and 10 is vacuum-breaking valve, 11 is rubber hose, and 12 is vavuum pump, and 13 is plate pusher, and 14 is cooling tube, and 15 is cooling bath.
The specific embodiment
Accompanying drawing discloses the structural representation of preferred embodiment involved in the present invention without limitation; Explain technical scheme of the present invention below with reference to accompanying drawing.
The dehydrogenation of vacuum settled process is a kind of non-method for adsorbing and purifying, is based on Henry's law, and aluminium alloy melt surface is vacuumized, reduce hydrogen dividing potential drop, its solubility in aluminium alloy melt reduced and carry out dehydrogenation, generally, in the time of 10mmHg vacuum, hydrogen can reduce to 0.1ml/100gAl.On the other hand, when vacuum leaves standstill, a large amount of bubble hydrogen floatings that produce in aluminum melt also can be taken away non-metallic inclusion, make aluminium melt purifying.
Shown in Fig. 1, the operation principle of vacuum standing, gas removal deslagging device of the present invention is:
Operate by swivel tee valve, in the time of triple valve rotation direction vacuum adapter, open vavuum pump, holding furnace is vacuumized, and now in furnace chamber, the dividing potential drop of hydrogen reduces, and the hydrogen in aluminium alloy melt can constantly be separated out, thereby the hydrogen content in reduction melt, keep removing vacuum after certain hour, triple valve rotation direction compressed air joint, can cast; Between the lower surface of sealing block and bell, embed high-temperature resistant seal ring, rely on the briquetting deadweight of self sealss briquetting to be pressed on bell, for sealing body of heater.
To compare by the finished product and two the check experiment finished products that relatively adopt vacuum standing, gas removal deslagging device of the present invention to produce below, so that vacuum standing, gas removal deslagging device of the present invention to be described, progress in aluminum alloy low-pressure casting technology, is specially:
External environment: 30 ° of C of indoor temperature are cloudy, moist.
Contrast 1: raw material is ZL 101 alloy ingot, in electric furnace, be heated to 760 ℃ of molten clear rear insulations 30 minutes, cool to after 730 ℃, aluminum melt is transported in low pressure casting machine holding furnace, the aluminum melt that takes a morsel is cast to reduce pressure to solidify in the special casting mold of hydrogen meter and reduces pressure and solidify, and obtains sample 1;
Contrast 2: raw material is ZL 101 alloy ingot, in electric furnace, be heated to 760 ℃ of molten clear rear insulations 30 minutes, cool to after 730 ℃, add ternary refining agent and carry out melt treatment, the standing Sr that adds after 10 minutes goes bad, and is incubated after 30 minutes and carries out N2 gas rotary jet degassing processing 20 minutes; The aluminum melt that takes a morsel is afterwards cast to decompression and solidifies in the special casting mold of hydrogen meter and reduce pressure and solidify, must sample 2 after cooling;
Contrast 3: raw material is ZL 101 alloy ingot, in electric furnace, be heated to 760 ℃ of molten clear rear insulations 30 minutes, cool to after 730 ℃, after aluminum melt is transported in low pressure casting machine holding furnace, adopt device of the present invention to carry out vacuum and leave standstill 30 minutes, the aluminum melt that takes a morsel is afterwards cast to reduce pressure to solidify in the special casting mold of hydrogen meter and reduces pressure and solidify, and obtains sample 3.
Result shows, sample 1 surfacing only has a small amount of several holes bubble, shows that aluminum melt quality is better, and hydrogen, slag content are lower; Sample 2 surface is upper drum obviously, exists a large amount of eyelets to show that melt quality is very poor, and hydrogen, slag content are high; Sample 3 surfaces are substantially identical with sample 1, and surfacing there is no hole bubble.Result shows, adopts device of the present invention to carry out vacuum and leaves standstill, and has obvious degasification slagging-off effect.
Embodiment 2
External environment: 30 ° of C of indoor temperature are cloudy, moist.
Contrast 1: raw material is ZL 101 alloy ingot, in electric furnace, be heated to 760 ℃ of molten clear rear insulations 30 minutes, cool to after 730 ℃, after aluminum melt is transported in low pressure casting machine holding furnace, the aluminium body that takes a morsel is cast to Quench and surveys in hydrogen sample special thick copper mold, processes after cooling and surveys hydrogen sample 1;
Contrast 2: raw material is ZL 101 alloy ingot, in electric furnace, be heated to 760 ℃ of molten clear rear insulations 30 minutes, cool to after 730 ℃, add ternary refining agent and carry out melt treatment, the standing Sr that adds after 10 minutes goes bad, and is incubated after 30 minutes and carries out N2 gas rotary jet degassing processing 20 minutes.The aluminium body that takes a morsel is afterwards cast to Quench and surveys in hydrogen sample special thick copper mold, processes after cooling and surveys hydrogen sample 2;
Contrast 3: raw material is ZL 101 alloy ingot, in electric furnace, be heated to 760 ℃ of molten clear rear insulations 30 minutes, cool to after 730 ℃, after aluminum melt is transported in low pressure casting machine holding furnace, adopt device of the present invention to carry out vacuum and leave standstill 30 minutes, the aluminium body that takes a morsel is cast to Quench and surveys in hydrogen sample special thick copper mold, processes after cooling and surveys hydrogen sample 3;
Three of gained samples are carried out on accurate hydrogen meter to the mensuration of hydrogen content, obtain as following table 1 result:
Hydrogen content test result (ppm) under table 1 A356 alloy different conditions:
| Survey |
1 | 2 | 3 |
| Hydrogen content (ppm) | 0.32 | 0.16 | 0.15 |
Claims (7)
1. the vacuum standing, gas removal deslagging device of a low-pressure casting thermal insulation furnace, comprise holding furnace and pumped vacuum systems, it is characterized in that: described pumped vacuum systems comprises cooling device and vavuum pump, described holding furnace is connected with cooling device, and cooling device is connected successively with vavuum pump.
2. the vacuum standing, gas removal deslagging device of low-pressure casting thermal insulation furnace according to claim 1, is characterized in that: described holding furnace is provided with compressed air joint; Described pumped vacuum systems comprises vacuum adapter, cooling device, vavuum pump, between described pumped vacuum systems and pumped vacuum systems, be provided with triple valve, the first opening of described triple valve is connected with compressed air joint, and the second opening is connected with one end of vacuum adapter, and the 3rd opening is connected with nitrogen cylinder; The described vacuum adapter other end is connected with cooling device by vacuum quick release flange; Between described cooling device and vavuum pump, be connected by rubber hose, described rubber hose is provided with vacuum pumping valve and vacuum-breaking valve; Described holding furnace comprises the crucible being arranged in holding furnace, in described holding furnace, is provided with stalk, and holding furnace is stretched out on described stalk top, and the part that stalk stretches out holding furnace is provided with bell, and self sealss briquetting is installed on described bell.
3. the vacuum standing, gas removal deslagging device of low-pressure casting thermal insulation furnace according to claim 2, is characterized in that: described cooling device comprises cooling bath and cooling tube, described cooling tube one end is connected with vacuum adapter, and the other end is connected with rubber hose; Described cooling tube is placed in cooling bath, in described cooling bath, is loaded with cooling fluid.
4. the vacuum standing, gas removal deslagging device of low-pressure casting thermal insulation furnace according to claim 3, is characterized in that: described cooling tube is arranged to helical form.
5. the vacuum standing, gas removal deslagging device of low-pressure casting thermal insulation furnace according to claim 4, is characterized in that: between the lower surface of described self sealss briquetting and bell, embed high-temperature resistant seal ring.
6. the vacuum standing, gas removal deslagging device of low-pressure casting thermal insulation furnace according to claim 5, is characterized in that: described pumped vacuum systems is placed on plate pusher.
7. the deslagging method of the vacuum standing, gas removal deslagging device of a low-pressure casting thermal insulation furnace as claimed in claim 1, it is characterized in that: when operation, swivel tee valve, in the time of triple valve rotation direction vacuum adapter, open vavuum pump, holding furnace is vacuumized, and now in furnace chamber, the dividing potential drop of hydrogen reduces, and the hydrogen in aluminium alloy melt can constantly be separated out, thereby the hydrogen content in reduction melt, keep removing vacuum after certain hour, triple valve rotation direction compressed air joint, can cast.
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| CN201410005920.2A CN103785813A (en) | 2014-01-07 | 2014-01-07 | Vacuum standing degassing and deslagging device of low-pressure casting heat-insulation furnace and deslagging method for vacuum standing degassing and deslagging device |
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| CN201410005920.2A CN103785813A (en) | 2014-01-07 | 2014-01-07 | Vacuum standing degassing and deslagging device of low-pressure casting heat-insulation furnace and deslagging method for vacuum standing degassing and deslagging device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104070151A (en) * | 2014-06-20 | 2014-10-01 | 江苏神马电力股份有限公司 | Slag discharging device |
| CN104152708A (en) * | 2014-08-01 | 2014-11-19 | 南京博乔机械有限公司 | Resistance melting furnace with vacuum degassing system |
| CN104493135A (en) * | 2014-10-10 | 2015-04-08 | 新兴重工湖北三六一一机械有限公司 | Sprue insulation device for low-pressure casting |
| CN105935760A (en) * | 2016-03-09 | 2016-09-14 | 南京龙超金属制造科技有限公司 | Vacuum degassing device for metal-mould low-pressure casting and metal-mould low-pressure casting technique |
| CN105950879A (en) * | 2016-07-06 | 2016-09-21 | 安徽宏泰模具有限公司 | Casting aluminum fluid descaling device |
| CN106583701A (en) * | 2017-02-14 | 2017-04-26 | 昆山莱特库勒机械有限公司 | Auxiliary device for molten aluminum mold casting |
| CN110238355A (en) * | 2019-06-06 | 2019-09-17 | 东风本田汽车有限公司 | Thermometric dehydrogenation weigh with station integrated equipment and its weighing thermometric dehydrogenating process |
| CN112342400A (en) * | 2020-10-14 | 2021-02-09 | 潘玉霞 | Precise bubble-eliminating casting process for hardware casting |
| CN112853136A (en) * | 2020-12-30 | 2021-05-28 | 贵州华科铝材料工程技术研究有限公司 | Preparation method of sodium-removed aluminum magnesium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104070151A (en) * | 2014-06-20 | 2014-10-01 | 江苏神马电力股份有限公司 | Slag discharging device |
| CN104152708A (en) * | 2014-08-01 | 2014-11-19 | 南京博乔机械有限公司 | Resistance melting furnace with vacuum degassing system |
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| CN110238355A (en) * | 2019-06-06 | 2019-09-17 | 东风本田汽车有限公司 | Thermometric dehydrogenation weigh with station integrated equipment and its weighing thermometric dehydrogenating process |
| CN112342400A (en) * | 2020-10-14 | 2021-02-09 | 潘玉霞 | Precise bubble-eliminating casting process for hardware casting |
| CN112853136A (en) * | 2020-12-30 | 2021-05-28 | 贵州华科铝材料工程技术研究有限公司 | Preparation method of sodium-removed aluminum magnesium alloy |
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Application publication date: 20140514 |