CN102181674A - Method for mechanically uniformly dispersing lead 28 lead semisolid size - Google Patents
Method for mechanically uniformly dispersing lead 28 lead semisolid size Download PDFInfo
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- CN102181674A CN102181674A CN 201110088852 CN201110088852A CN102181674A CN 102181674 A CN102181674 A CN 102181674A CN 201110088852 CN201110088852 CN 201110088852 CN 201110088852 A CN201110088852 A CN 201110088852A CN 102181674 A CN102181674 A CN 102181674A
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Abstract
The invention discloses a method for mechanically uniformly dispersing lead 28 lead semisolid size, belonging to the research field of mechanical uniform dispersion of lead 28 lead semisolid size. By the method of mechanical preparation, the method uses a double-vane layer mechanical stirrer to mechanically uniformly disperse the lead 28 lead semisolid size on the condition that the radian of concave cambered surfaces is respectively 48-50 degrees and 61-63 degrees in the thickness directions of the double-surface double-arc vanes of the upper and the lower layer. The method can rapidly realize the uniform distribution of lead liquid drops, and the time for uniform dispersion can be shortened to 7min plus 50s.
Description
Technical field
The present invention relates to a kind of mechanical homodisperse method of aluminium 28 lead semisolid slurry.
Background technology
Publication number: CN1858278A, denomination of invention: on " a kind of method for preparing aluminium 20 tin semi solid slurry by mechanically stirring ", set forth the mechanical preparation method of aluminium 20 tin semi solid slurry, promptly, the circumferential movement that produces when utilizing the two-sided pair of arc shaped blade rotation of mechanical stirrer, inwardly move and move upward, smash the nascent solid phase that forms in the aluminium 20 tin melt solidifying processes, and constantly the aluminium 20 tin melts around the two-sided pair of arc shaped blade are moved on to inside, the aluminium 20 tin melts of bottom are moved on to top, the centrifugal motion and precipitation motion that stop borne tin droplets, realize the dispersion of borne tin droplets, when the circumferential movement state of aluminium 20 tin melts causes the dispersion effect variation of borne tin droplets near two-sided pair of arc shaped blade circumferential movement state, mechanical stirrer changes sense of rotation, utilizes two arcs of two-sided pair of arc shaped blade another side to continue to disperse borne tin droplets; By means of the control device that moves up and down of mechanical stirrer, come the driving device agitator to move up and down, thereby in whole crucible scope, realize the homodisperse of borne tin droplets, obtain the aluminium 20 tin semi solid slurry that borne tin droplets is evenly distributed.In this mechanical preparation method, mechanical stirrer is single blade layer mechanical stirrer, adopt the individual layer blade, in effective contact range of blade and semi solid slurry, by blade borne tin droplets is applied dissipation of ferees, constantly borne tin droplets is distributed in the semi solid slurry, the radian of cancave cambered surface is 20～30 ° on two-sided pair of arc shaped blade length direction of disclosed mechanical stirrer individual layer in patent CN1858278A, the radian of cancave cambered surface is under 45～90 ° of conditions on the thickness direction, single blade layer mechanical stirrer and moving up and down after the control device operation is homodisperse 8～10min can obtain the aluminium 20 tin semi solid slurry that borne tin droplets is evenly distributed.
Aluminium 28 lead semisolid slurry is the semi solid slurry that contains the plumbous drop of 28wt% and nascent solid phase particles of 72wt% and liquid phase, adopt the CN1858278A patented method, be that the radian of cancave cambered surface on 20～30 °, thickness direction is under 45～90 ° the condition at the radian of cancave cambered surface on two-sided pair of arc shaped blade length direction of disclosed mechanical stirrer individual layer, need homodisperse after 10～12 minutes, just can obtain the uniform aluminium 28 lead semisolid slurry of plumbous droplet distribution.
Preparation for aluminium 28 lead semisolid slurry, realizing under the equally distributed prerequisite of plumbous drop, mechanical stirrer and the working time that moves up and down control device thereof are that the homodisperse time is short more, energy consumption is more little, cost is low more, and the pollution that aluminium 28 lead semisolid slurry is subjected to is also few more, and its quality is high more, therefore can realize that the homodisperse time of the equally distributed aluminium 28 lead semisolid slurry of plumbous drop is short more good more.
Summary of the invention
Technical problem to be solved by this invention is, overcome the deficiency of existing machinery preparation method " the homodisperse time is long ", provide a kind of and can realize the homodisperse method of plumbous drop in the aluminium 28 lead semisolid slurry fast, further shorten and realize the equally distributed homodisperse time of plumbous drop.
The technical solution adopted for the present invention to solve the technical problems is: adopt mechanical preparation method, utilize double leaf lamella mechanical stirrer, in cancave cambered surface arc minutes on two-sided pair of arc shaped blade thickness direction of levels is not under the condition of 48～50 ° and 61～63 °, and aluminium 28 lead semisolid slurry is carried out homodisperse.
The invention has the beneficial effects as follows: drip for the heavy-fluid in the melt, want to finish as early as possible its dispersion in melt, must strengthen disperseing intensity.In the semi solid slurry mechanical preparation method, if the individual layer blade drips the enforcement dispersion to the heavy-fluid in the semi solid slurry after, and then utilize another layer blade to implement to disperse for the second time again, so, the dispersion effect that heavy-fluid is dripped in the semi solid slurry will be clearly better, realize that heavy-fluid drips the equally distributed homodisperse time and will further shorten, the present invention utilizes the continuous quadratic of the twi-tier blade after the optimum combination of cancave cambered surface radian on two-sided pair of arc shaped blade thickness direction of levels to disperse, further promote heavy-fluid to drop in the uniform distribution in the semi solid slurry, thereby reached the purpose that shortens the homodisperse time.Utilize the present invention, aluminium 28 lead semisolid slurry is carried out homodisperse, realize that the equally distributed homodisperse time of plumbous drop can shorten to 7 minutes and 50 seconds, shortened 21% at least again than the 10 minutes the shortest homodisperse time of adopting the CN1858278A patented method.
Description of drawings
Fig. 1 carries out the front view of homodisperse device to aluminium 28 lead semisolid slurry for the inventive method.
Among the figure, circular agitator arm 1, two-sided pair of arc shaped blade 2, plumbago crucible 3, heating tube 4, cooling tube 5, aluminium 28 lead semisolid slurry 6 stops up 7, loam cake 8, Ar tracheae 9, underframe 11, bearing shell 12, thrust bearing 13, motor 14, gear drive 15, guide plate 16, guide path 17, tooth bar 18, motor 19, transmission rig 20, upper stroke switch 21, lower stroke switch 22, support 23.
Fig. 2 carries out the A-A view of homodisperse device to aluminium 28 lead semisolid slurry for the inventive method.
Among the figure, thermopair 10.
Fig. 3 carries out the B-B partial view of homodisperse device to aluminium 28 lead semisolid slurry for the inventive method.
Fig. 4 is the microtexture of the aluminium 28 lead semisolid slurry that adopts the inventive method that aluminium 28 lead semisolid slurry is carried out to obtain behind the homodisperse.
Embodiment
As follows to specifying of plumbous drop device in the inventive method homodisperse aluminium 28 lead semisolid slurry in conjunction with the accompanying drawings:
Plumbous drop device comprises in the homodisperse aluminium 28 lead semisolid slurry: mechanical stirrer and drive and move up and down control device, plumbago crucible 3, loam cake 8, obstruction 7, Ar tracheae 9 and thermopair 10.
Plumbago crucible 3 adopts mechanical connection manners to be fixed on the underframe 11, and heating tube 4 and cooling tube 5 uniformly at intervals in its wall are connected with the cooling fluid plenum system with external power source respectively.
Mechanical stirrer is a double leaf lamella mechanical stirrer, by circular agitator arm 1 and up and down two blade layers constitute, material is a heat-stable ceramic.The lower end of circular agitator arm 1 is square, its four sides is tangent with circular agitator arm 1, two blade layers are positioned at the square lower end of circular agitator arm 1 up and down, at interval a is 20mm, and four other shapes and the identical two-sided pair of arc shaped blade 2 of corresponding distribution the cancave cambered surface radian difference on the vane thickness direction are respectively arranged in two blade layers up and down.Four two-sided pair of arc shaped blades 2 of lower floor are positioned at the bottom of the square lower end of circular agitator arm 1, four lateral vertical of its root and the square lower end of circular agitator arm and with it with wide; The lower surface of the lower surface of two-sided pair of arc shaped blade 2 and the square lower end of circular agitator arm is located in the same horizontal plane, and upper surface is parallel with lower surface; The left and right sides two side faces of two-sided pair of arc shaped blade 2 is the Gothic cancave cambered surface, be symmetrically distributed, in the longitudinal direction, cancave cambered surface outwardly, radian is 20～30 °, on thickness direction, cancave cambered surface up, radian is 61～63 °; About the crossing camber line of the top of two side cancave cambered surfaces and two-sided pair of arc shaped blade 2 upper surfaces tangent at two-sided pair of arc shaped blade 2 roots, about the bottom of two side cancave cambered surfaces and two-sided pair of tangent and tangent camber line of arc shaped blade 2 lower surfaces at the tangent line at two-sided pair of arc shaped blade 2 root places perpendicular to the square lower end side of circular agitator arm; Distance c between blade outer end and the crucible inwall is 5mm; Four two-sided pair of arc shaped blades 2 on upper strata are positioned at the top of the square lower end of circular agitator arm 1, the cancave cambered surface radian is 48～50 ° on the vane thickness direction, and the upper surface of the upper surface of this two-sided pair of arc shaped blade 2 and circular agitator arm 1 square lower end is located in the same horizontal plane.
The drive unit of mechanical stirrer is made of motor 14, gear drive 15 and locating mechanism.Locating mechanism is positioned at circular agitator arm 1 top, carry out transverse orientation by two bearing shells 12 up and down, carry out longitudinal register by two thrust bearings 13 up and down, the motor 14 of mechanical stirrer drive unit, gear drive 15 and locating mechanism adopt mechanical connection manner to be fixed on the guide plate 16 respectively, and guide plate 16 can move up and down in the guide path on being fixed in support 23 17.
Mechanical stirrer moves up and down control device and is made of motor 19, transmission rig 20, upper stroke switch 21 and lower stroke switch 22.Transmission rig 20 is made of tooth bar 18 and gear, turbine and worm drive, the lower end of tooth bar 18 adopts mechanical connection manner to be connected with the guide plate 16 of mechanical stirrer drive unit, turning to of motor 19 by upper stroke switch 21, lower stroke switch 22 controls, just, when the two-sided pair of arc shaped blade 2 in the upper strata of mechanical stirrer is moved upwards up to semi solid slurry 6 tops, lower stroke switch 22 is touched on the top of tooth bar 18, and motor 19 changes turn to, and mechanical stirrer is moved down; When two-sided pair of arc shaped blade 2 of the lower floor of mechanical stirrer is moved down into plumbago crucible 3 bottoms, upper stroke switch 21 is touched on the top of tooth bar 18, motor 19 changes turn to, mechanical stirrer is moved up, and motor 19, transmission rig 20, upper stroke switch 21, lower stroke switch 22 that mechanical stirrer moves up and down control device adopt mechanical connection manner to be fixed on the support 23.
Ar tracheae 9 is fixed in the hole of loam cake 8, and thermopair 10 is fixed in the sidewall of plumbago crucible 3, and its end contacts with semi solid slurry 6, stops up 7 and is positioned at plumbago crucible 3 bottoms.
The power of mechanical stirrer is 2kW, and mechanical stirrer changed a sense of rotation every 1～3 minute, and rotating speed is 3～5 revolutions per seconds, mechanical stirrer move up and down speed control continuously at 5～20mm/s.
A kind of mechanical homodisperse method of aluminium 28 lead semisolid slurry, the circumferential movement that produces when utilizing the two-sided pair of arc shaped blade rotation of mechanical stirrer, inwardly move and move upward, smash the nascent solid phase that forms in the aluminium 28 plumbous melt solidifying processes, and constantly the aluminium 28 plumbous melts around the two-sided pair of arc shaped blade are moved on to inside, the aluminium 28 plumbous melts of bottom are moved on to top, the centrifugal motion and precipitation motion that stop plumbous drop, realize the dispersion of plumbous drop, when the circumferential movement state of aluminium 28 plumbous melts causes the dispersion effect variation of plumbous drop near two-sided pair of arc shaped blade circumferential movement state, mechanical stirrer changes sense of rotation, utilizes two arcs of two-sided pair of arc shaped blade another side to continue to disperse plumbous drop; And the control device that moves up and down by means of mechanical stirrer, come the driving device agitator to move up and down continuously, thereby in whole crucible scope, realize the homodisperse of plumbous drop, obtain the uniform aluminium 28 lead semisolid slurry of plumbous droplet distribution, may further comprise the steps:
Embodiment one, at the rotating speed of double leaf lamella mechanical stirrer is that 3 revolutions per seconds, the speed of moving up and down are 5mm/s, to change sense of rotation, a homodisperse temperature every 3 minutes be that the cancave cambered surface radian is under 20 ° on 600 ℃, the two-sided pair arc shaped blade length direction, when the cancave cambered surface arc minutes was not 48 ° and 61 ° on two-sided pair of arc shaped blade thickness direction of levels, the homodisperse time of realizing the equally distributed aluminium 28 lead semisolid slurry of plumbous drop was 7 minutes and 50 seconds.
Embodiment two, at the rotating speed of double leaf lamella mechanical stirrer is that 4 revolutions per seconds, the speed of moving up and down are 20mm/s, to change sense of rotation, a homodisperse temperature every 1 minute be that the cancave cambered surface radian is under 25 ° on 600 ℃, the two-sided pair arc shaped blade length direction, when the cancave cambered surface arc minutes was not 48 ° and 63 ° on two-sided pair of arc shaped blade thickness direction of levels, the homodisperse time of realizing the equally distributed aluminium 28 lead semisolid slurry of plumbous drop was 7 minutes and 40 seconds.
Embodiment three, at the rotating speed of double leaf lamella mechanical stirrer is that 5 revolutions per seconds, the speed of moving up and down are 15mm/s, to change sense of rotation, a homodisperse temperature every 2 minutes be that the cancave cambered surface radian is under 30 ° on 625 ℃, the two-sided pair arc shaped blade length direction, when the cancave cambered surface arc minutes was not 50 ° and 61 ° on two-sided pair of arc shaped blade thickness direction of levels, the homodisperse time of realizing the equally distributed aluminium 28 lead semisolid slurry of plumbous drop was 7 minutes and 40 seconds.
Embodiment four, at the rotating speed of double leaf lamella mechanical stirrer is that 4 revolutions per seconds, the speed of moving up and down are 20mm/s, to change sense of rotation, a homodisperse temperature every 1 minute be that the cancave cambered surface radian is under 25 ° on 625 ℃, the two-sided pair arc shaped blade length direction, when the cancave cambered surface arc minutes was not 50 ° and 63 ° on two-sided pair of arc shaped blade thickness direction of levels, the homodisperse time of realizing the equally distributed aluminium 28 lead semisolid slurry of plumbous drop was 7 minutes and 50 seconds.
Embodiment five, at the rotating speed of double leaf lamella mechanical stirrer is that 3 revolutions per seconds, the speed of moving up and down are 5mm/s, to change sense of rotation, a homodisperse temperature every 3 minutes be that the cancave cambered surface radian is under 20 ° on 617 ℃, the two-sided pair arc shaped blade length direction, when the cancave cambered surface arc minutes was not 49 ° and 62 ° on two-sided pair of arc shaped blade thickness direction of levels, the homodisperse time of realizing the equally distributed aluminium 28 lead semisolid slurry of plumbous drop was 7 minutes and 40 seconds.
As seen, under cancave cambered surface arc minutes on two-sided pair of arc shaped blade thickness direction of levels of double leaf lamella mechanical stirrer is not 48～50 ° and 61～63 ° of conditions, aluminium 28 lead semisolid slurry is carried out mechanical homodisperse, realize that the equally distributed homodisperse time of plumbous drop can shorten to 7 minutes and 50 seconds.
Claims (1)
1. the mechanical homodisperse method of an aluminium 28 lead semisolid slurry, the circumferential movement that produces when utilizing the two-sided pair of arc shaped blade rotation of mechanical stirrer, inwardly move and move upward, smash the nascent solid phase that forms in the aluminium 28 plumbous melt solidifying processes, and constantly the aluminium 28 plumbous melts around the two-sided pair of arc shaped blade are moved on to inside, the aluminium 28 plumbous melts of bottom are moved on to top, the centrifugal motion and precipitation motion that stop plumbous drop, realize the dispersion of plumbous drop, when the circumferential movement state of aluminium 28 plumbous melts causes the dispersion effect variation of plumbous drop near two-sided pair of arc shaped blade circumferential movement state, mechanical stirrer changes sense of rotation, utilizes two arcs of two-sided pair of arc shaped blade another side to continue to disperse plumbous drop; And the control device that moves up and down by means of mechanical stirrer, come the driving device agitator to move up and down continuously, thereby in whole crucible scope, realize the homodisperse of plumbous drop, obtain the uniform aluminium 28 lead semisolid slurry of plumbous droplet distribution, may further comprise the steps:
Step 1, preparation aluminium 28 plumbous melts, temperature is controlled at 760 ℃;
Step 2 is poured aluminium 28 plumbous melts in the plumbago crucible into, and crucible is preheating to 605 ℃ by the heating tube in its wall, cover loam cake after, connect Ar gas with anti-oxidation;
Step 3, start mechanical stirrer and move up and down control device, aluminium 28 plumbous melts are stirred, simultaneously, close in the power supply of heating tube and the cooling tube in sidewall of crucible and to connect water coolant and cool off, melt is cooled to 600～625 ℃ of homodisperse temperature after, close water coolant, open and regulate the power supply of heating tube, make melt temperature be stabilized in this homodisperse temperature; Under this homodisperse temperature, behind the homodisperse certain hour, obtain the aluminium 28 lead semisolid slurry of homogeneous microstructure;
It is characterized in that mechanical stirrer is a double leaf lamella mechanical stirrer, the cancave cambered surface arc minutes is not 48～50 ° and 61～63 ° on two-sided pair of arc shaped blade thickness direction of its levels.
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| CN 201110088852 CN102181674A (en) | 2011-04-10 | 2011-04-10 | Method for mechanically uniformly dispersing lead 28 lead semisolid size |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858278A (en) * | 2006-06-08 | 2006-11-08 | 北京交通大学 | Method for preparing aluminium 20 tin semi solid slurry by mechanically stirring |
| CN101024240A (en) * | 2007-01-11 | 2007-08-29 | 北京交通大学 | Method and apparatus for small metal semi-solid slurry in solidification zone |
| CN201693159U (en) * | 2010-06-20 | 2011-01-05 | 浙江工贸职业技术学院 | Semisolid slurry stirring preparation device for light metal |
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- 2011-04-10 CN CN 201110088852 patent/CN102181674A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858278A (en) * | 2006-06-08 | 2006-11-08 | 北京交通大学 | Method for preparing aluminium 20 tin semi solid slurry by mechanically stirring |
| CN101024240A (en) * | 2007-01-11 | 2007-08-29 | 北京交通大学 | Method and apparatus for small metal semi-solid slurry in solidification zone |
| CN201693159U (en) * | 2010-06-20 | 2011-01-05 | 浙江工贸职业技术学院 | Semisolid slurry stirring preparation device for light metal |
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Application publication date: 20110914 |