CN1190509C - Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof - Google Patents
Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof Download PDFInfo
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- CN1190509C CN1190509C CNB031270719A CN03127071A CN1190509C CN 1190509 C CN1190509 C CN 1190509C CN B031270719 A CNB031270719 A CN B031270719A CN 03127071 A CN03127071 A CN 03127071A CN 1190509 C CN1190509 C CN 1190509C
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Abstract
The present invention relates to a method for purifying impurities in casting and smelting magnesium alloy, and a gas blowing device of the method. The present invention is characterized in that a fusing agent for removing impurities is blown into molten alloy by using pressure inert gas as a carrier, the gas pressure of the inert gas is from 0.05MPa to 0.5MPa, the flow quantity is from 5 L/min to 100 L/min, and the flow quantity of a gas-carrier fusing agent is from 100 g/min to 500 g/min. The purifying method comprises the following steps: firstly, the gas-carrier fusing agent for removing impurities is blown for 10 to 20 min at a refining temperature, and then the fusing agent is stopped to be supplied; secondly, inert gas is continuously and singly jetted for 10 to 20 min and then held for 30 to 40 min, and pouring out of a furnace can be carried out. The gas blowing device of the method has the structure that a fusing agent bag is connected in parallel with a pipeline by which a pressure gas cylinder is communicated with a nozzle, and fusing agents loaded in the fusing agent bag are blown into molten alloy along with gas under the action of negative pressure of gasflow. The method has the advantages that alloy purity and performance are obviously improved, and the production efficiency is improved.
Description
Technical field
The present invention relates to the melting technology of cast magnesium alloys, be specifically related to the method for cleaning impurity in fusion process.
Background technology
The raw material that cast magnesium alloys adopted mainly was pure magnesium and alloying element in the past, promptly directly added alloying element in the pure magnesium and passed through refining and form.Recently along with magnesium alloy product, part are more and more many; running channel in part after the military service and the production, useless part etc. are used to produce again magnesium alloy; but this part material surface scribbles protective membrane or speckles with greasy dirt; and the calcium, the rare earth element that add easy oxidation for the performance (as creep-resistant property) of improving alloy; make producing alloy will be by refining, and the impurity that removes increases.Producing the method for refining that magnesium alloy adopted at present is after treating that the magnesium liquid temp meets the requirements of temperature, manually directly on magnesium liquid surface, shed flux, by machinery or hand mixing flux is entered in the middle of the magnesium liquid again, the producer that has is again by auxiliary stirring of blowing, and makes that impurity collides in flux and the magnesium liquid, by adsorption it is caught, form larger particles, through staticly settling processing, the particle of formation is sunken to furnace bottom at last, make it to separate, with liquid magnesium purification with magnesium liquid.This method of refining exists following several respects deficiency (1) to shed flux and stirring must be carried out simultaneously, because stirring action forms vortex on magnesium liquid surface, flux sprinkles the back and flocks together under the effect of vortex, can not be evenly distributed in the magnesium liquid, the probability that impurity contacts, collides in its flux and the magnesium liquid is lower, and refining time is longer, the magnesium liquid oxidation is more serious, constantly produce new impurity again, the effect of removing impurity is undesirable, can not produce the magnesium alloy of high cleanliness.(2) shed flux because manual operation, inclement condition, and human body had certain harm.The degree of uniformity that flux is shed varies with each individual, and final refining effect also has the fluctuation of certain amplitude.(3) because the refining process time is long, reduced production efficiency, increased the energy of keeping heating, its result increases production cost.(4) the magnesium alloy purity is lower, needs frequently to skim in the melting process before the casting, has not only increased the workload of fusing but also make the loss of melting process magnesium increase.
Summary of the invention
The object of the invention is to provide a kind of purifying method and blowing device thereof of improved casting smelting magnesium alloy, manually shed at present the above-mentioned shortcoming that removal of impurities flux exists to overcome, effectively improve the purity of melting magnesium alloy, to increase substantially its cast article performance quality, and improve working condition, improve labor productivity.
The inventive method adds the impurity reaction formation slag precipitate and separate in removal of impurities flux and the alloy liquid in the magnesium alloy liquation when being later stage refining in melting magnesium alloy technology, it is characterized in that removal of impurities flux is to be blown in the alloy liquid as carrier with the pressure rare gas element, its gaseous tension is 0.05MPa～0.5MPa, flow is 5L/min～100L/min, it is 100g/min～500g/min that gas carries the flux flow, the cleansing operation process is that advanced promoting the circulation of qi stops the flux supply after carrying removal of impurities flux winding-up 10～20min under refining temperature, continue independent blowing inert gas 10～20min again, leave standstill 30～40min cast of coming out of the stove at once then.
Be that the nozzle that will be blown into rare gas element inserts the winding-up down of alloy liquid level in the operation of this method, and simultaneously along horizontal plane with the circular frequency of 10 degree/seconds just carrying out, converse compound rotation.
The blowing device that is used for the purifying method of the above-mentioned casting smelting magnesium alloy of the present invention, comprise pressure cylinder that loads rare gas element and tensimeter, gas meter, filter dehydration meter, hydraulic quick coupler, the valve that connects successively by gas path pipe, it is characterized in that also being included in ball valve on the pipeline that connects between valve and nozzle by threeway and be connected with valvular flux bag, on the gas path pipe that connects nozzle, be connected with electric motor driving, to drive the nozzle rotation by belt pulley set.
Nozzle is that two ends have spout, middle angle is the splayed pipe of 160 degree.
Adopt purifying method of the present invention and blowing device thereof to compare, have the following advantages with present traditional technology:
1) gas carries removal of impurities flux and fully contacts with magnesium liquid, has increased the probability of flux and impurity collision, can effectively catch impurity, thereby effectively reduce foreign matter content.Compare through the magnesium alloy that salt-fog test and traditional technology are produced, purity improves one to two grade, can produce high cleanliness, high-quality cast magnesium alloys.
2) will stir, spread different technological processs such as flux, blowing refining originally, be combined in a technological process and finish, replaced manually, reduce personal errors and working strength of workers on the one hand with machinery, improve workman's work situation on the one hand, helped the healthy of workman.Only just can finish original 2～3 people's work now, save manpower with people's operating device.
3) gas flux blasting, both can increase flux and impurity collision probability, effectively catch impurity, the process merging that to originally carry out is separately again finished, make refining time be reduced to about 1 hour 20 minutes by original about 2 hours 20 minutes, production efficiency improved 20% more originally, produce the magnesium alloy ingot energy per ton and reduce 15～20%, production cost reduces by 10～12%.
4) in fusing, when insulation before Foundry Production,, the number of times of skimming is per hour pulled down the quantity of slag and was reduced 20% more originally by per hour being reduced to for 3 times 2 times originally, reduces the loss about 1% of magnesium, has alleviated foundryman's workload.
5) because magnesium alloy is purified, and the internal quality of casting of cast improves, and compares with the magnesium alloy of traditional explained hereafter, and tensile strength can improve 15%, solidity to corrosion improves one to two grade.
Description of drawings
Fig. 1 is a blowing device synoptic diagram of the present invention.
Embodiment
Embodiment 1
Casting AM50 magnesium alloy, raw material adopts pure magnesium ingot, fine aluminium, pure zinc and Mn-Al alloy, melting in smelting furnace, the alloy liquation carries out blowing refining under 700～730 ℃ of temperature, be about to the blowing device nozzle and insert the alloy liquid from smelting furnace top, in advance N
2Gas carries removal of impurities flux winding-up 10 minutes, and its gaseous tension is 0.25MPa, and it is 200g/min that flow 50L/min, gas carry the flux flow, closes the flux valve and stops the flux supply, continues independent N again
2Gas winding-up 10min closes air-supplying valve then, leaves standstill 30min, the cast of coming out of the stove at once.
The gained foundry goods is checked through salt-fog test, and inclusion content reduces by two grades than former habitual technology, and tensile strength improves 20%, and corrosion resisting property improves two grades, goes out the quantity of slag in the melting and reduces 11%.
Embodiment 2
Casting AM50 magnesium alloy, raw material adopt 50% to reclaim processing waste or the back foundry goods of being on active service, and all the other are pure magnesium ingot, fine aluminium, pure zinc and Mn-Al alloy, melting in smelting furnace, and the alloy liquation carries out refining under 700-730 ℃ of temperature, in advance SO
2Gas carries removal of impurities flux winding-up 19min, its gaseous tension 0.5MP
a, it is 100g/min that flow 95L/min, gas carry the flux flow, stops flux and supplies with, and continues independent SO again
2Gas winding-up 20min leaves standstill the cast of coming out of the stove behind the 40min.
The gained foundry goods is checked through salt-fog test, and inclusion content reduces by a grade than former habitual technology, and tensile strength improves 16%, and corrosion resisting property improves a grade, goes out the quantity of slag in the melting and reduces 10%.
Embodiment 3
Casting AZ91D magnesium alloy, raw material adopts 50% to reclaim processing waste or be on active service the back foundry goods, all the other are pure magnesium ingot, fine aluminium, pure zinc and Mn-Al alloy, melting in smelting furnace, the alloy liquation carries out refining under 720～740 ℃ of temperature, Ar gas carries removal of impurities flux winding-up 17min in advance, and its gaseous tension is 0.35MP
a, it is 200g/min that flow 60L/min, gas carry the flux flow, stops flux and supplies with, and continues independent Ar gas winding-up 20min again, leaves standstill the cast of coming out of the stove behind the 30min.
The gained foundry goods is checked through salt-fog test, and inclusion content reduces than former habitual technology; Two grades, tensile strength improves 15%, and corrosion resisting property improves two grades, goes out the quantity of slag in the melting and reduces 13%.
The nozzle that is blown into rare gas element in the foregoing description inserts the winding-up down of alloy liquid level, and simultaneously along horizontal plane with the circular frequency of 10 degree/seconds just carrying out, converse compound rotation.Rare gas element also can adopt CO
2Or He, SF
6
The embodiment that provides below in conjunction with accompanying drawing does the structure of the blowing device that is used for the inventive method and describes in further detail:
With reference to Fig. 1, this device comprises pressure cylinder 1 that loads rare gas element and tensimeter 2, gas meter 3, filter dehydration meter 4,5, hydraulic quick coupler 6, valve 10 and the nozzle 17 that connects successively by gas path pipe, its feature also is included on the gas path pipe that connects 17 at valve 10 and nozzle by threeway 12 and is provided with the flux bag 9 of valve 11, ball valve 13 on the gas path pipe that connects nozzle 17 drives with motor 14 by belt pulley set 15,16 and is connected, to drive nozzle 17 rotations.
Nozzle 17 is that two ends have spout, middle angle is the splayed pipe of 160 degree.
Ball valve 13 inlet links to each other with threeway, and outlet links to each other with nozzle pipe, and belt pulley set 15,16 is contained on the pipeline of 13 of nozzle 17 and ball valves, and the drive nozzle rotated around ball valve when belt pulley set was rotated.
In order to make the removal of impurities flux that loads in the flux bag 9 flow to nozzle 17 by air-negative-pressure more smoothly, go back and company's one pipeline and flux bag 9 intracavity inter-connections by threeway 7, valve 8 on the gas path pipe after hydraulic quick coupler 6.Like this, the flux in the flux bag is subjected to the pressure of its upper gas and the suction dual function of bottom simultaneously, can more unobstructedly flow out with air-flow reliably.
During work, nozzle 17 is inserted under the alloy liquation liquid level from the top of melting fire door, Open valve 8,10,11 realizes that promptly gas carries the winding-up of removal of impurities flux simultaneously; Open valve 10, valve-off 8,11 is promptly realized blowing separately.
Claims (6)
1. the purifying method of a casting smelting magnesium alloy, it is the impurity reaction formation slag precipitate and separate that when the later stage refining, in the magnesium alloy liquation, adds in removal of impurities flux and the alloy, it is characterized in that removal of impurities flux is to be blown in the alloy liquid as carrier with the pressure rare gas element, its gaseous tension is 0.05MPa～0.5MPa, flow is 5L/min～100L/min, it is 100g/min～500g/min that gas carries the flux flow, its injection method is that nozzle is inserted winding-up under the alloy liquid level, and just carrying out along the circular frequency of horizontal plane simultaneously with 10 degree/seconds, converse compound rotation, the cleansing operation process is that advanced promoting the circulation of qi stops the flux supply after carrying removal of impurities flux winding-up 10～20min under refining temperature, continue independent rare gas element 10～20min again, leave standstill 30～40min cast of coming out of the stove at once then.
2. the purifying method of casting smelting magnesium alloy according to claim 1 is characterized in that described rare gas element can adopt N
2, CO
2Or Ar, He, SF
6, SO
2
3. blowing device that is exclusively used in the purifying method of the described casting smelting magnesium alloy of claim 1, comprise pressure cylinder (1) that loads rare gas element and the tensimeter (2) that connects successively by gas path pipe, gas meter (3), filter dehydration meter (4), (5), hydraulic quick coupler (6), valve (10), it is characterized in that also being included on the pipeline that connects between valve (10) and nozzle (17) by threeway (12) and be provided with the flux bag (9) of valve (11), ball valve (13) on the gas path pipe that connects nozzle (17) is by belt pulley set (15), (16) be connected with motor (14) driving, to drive nozzle (17) rotation.
4. blowing device according to claim 3 is characterized in that described nozzle (17) is that two ends have spout, middle angle is the splayed pipe of 160 degree.
5. blowing device according to claim 3, it is characterized in that described ball valve (13) inlet links to each other with threeway, outlet links to each other with nozzle pipe, belt pulley set (15), (16) are contained on the pipeline between nozzle (17) and ball valve (13), drive nozzle during the belt pulley set rotation and rotate around ball valve.
6. blowing device according to claim 3 is characterized in that going back and company's one pipeline and flux bag (9) intracavity inter-connection by threeway (7), valve (8) on described hydraulic quick coupler (6) gas path pipe afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031270719A CN1190509C (en) | 2003-06-11 | 2003-06-11 | Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031270719A CN1190509C (en) | 2003-06-11 | 2003-06-11 | Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1470658A CN1470658A (en) | 2004-01-28 |
| CN1190509C true CN1190509C (en) | 2005-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031270719A Expired - Fee Related CN1190509C (en) | 2003-06-11 | 2003-06-11 | Purifying method for casting-smelting mag nesium alloy and air blowing apparatus thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463732C (en) * | 2006-05-22 | 2009-02-25 | 苏州有色金属加工研究院 | Casting-rolling process and equipment for magnesium alloy slab |
| CN102586605B (en) * | 2011-01-18 | 2014-02-19 | 华孚精密金属科技(常熟)有限公司 | Method for recovering aluminum-containing magnesium alloy waste material |
| CN102794398A (en) * | 2012-09-12 | 2012-11-28 | 济钢集团有限公司 | Die casting process using protective gas for casting and special casting box |
| CN102794399A (en) * | 2012-09-12 | 2012-11-28 | 济钢集团有限公司 | Casting process for pre-introducing protective gas into casting die and special casting equipment |
| CN105543529B (en) * | 2016-01-04 | 2017-08-25 | 贵州航天风华精密设备有限公司 | A kind of magnesium alloy composite refining method |
| CN107557595A (en) * | 2017-08-25 | 2018-01-09 | 太湖县光华铝业有限公司 | Packaged type aluminum liquid purifying device |
| CN112746191A (en) * | 2020-12-30 | 2021-05-04 | 贵州华科铝材料工程技术研究有限公司 | Preparation method of mixed Sc-Zr aluminum alloy |
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2003
- 2003-06-11 CN CNB031270719A patent/CN1190509C/en not_active Expired - Fee Related
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| CN1470658A (en) | 2004-01-28 |
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