CN1657201A - Method of preparing semisolid alloy slurry and its equipment - Google Patents
Method of preparing semisolid alloy slurry and its equipment Download PDFInfo
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- CN1657201A CN1657201A CN 200410039192 CN200410039192A CN1657201A CN 1657201 A CN1657201 A CN 1657201A CN 200410039192 CN200410039192 CN 200410039192 CN 200410039192 A CN200410039192 A CN 200410039192A CN 1657201 A CN1657201 A CN 1657201A
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- 239000007787 solid Substances 0.000 claims abstract description 77
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000013016 damping Methods 0.000 claims description 162
- 229910052751 metal Inorganic materials 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 32
- 239000000498 cooling water Substances 0.000 claims description 27
- 239000000155 melt Substances 0.000 claims description 11
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- 238000000048 melt cooling Methods 0.000 claims description 2
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- 238000010118 rheocasting Methods 0.000 description 4
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- 238000004512 die casting Methods 0.000 description 2
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- 238000007789 sealing Methods 0.000 description 2
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Abstract
A technology for preparing a semi-solid alloy slurry includes such steps as smelting alloy, refining and removing slags in a static furnace, regulating its temp to the temp which is 40-60 deg.C higher than its liquid-phase line, filling a container with bigger cross-section and a damping-cooling tube installed to its bottom, controlling the pressure for constant flow speed, and flowing it through said tube while stirring by a stirring rod in the tube and cooling by cold water a temp which is several deg.C lower than its liquid-phase line.
Description
Technical field
The present invention relates to a kind of method and equipment thereof for preparing semi-solid alloy slurry.
Background technology
Semi-solid-state metal process technology (Semi-Solid Metal Forming or Semi-Solid Metal Process, be called for short SSM) be that metal is in process of setting, carry out strong agitation or pass through the control curing condition, the generation of broken dendrite that is generated or inhibition dendrite, acquisition axle such as has or axle, even, tiny primary phase such as is similar to, and primary phase is uniformly distributed in the suspension semi solid slurry in the liquid phase.This kind slurry still has good mobility even solid rate reaches 60% under the effect of external force.Can utilize technologies such as die casting, extruding, die forging to shape.
The process route of semi-solid processing mainly contains two classes: a class is with semi solid slurry direct forming under the condition that keeps its semi-solid temperature of preparation, is commonly called rheocasting or rheological molding (Rheo-castingor Rheo-moulding); Another kind of is that semi solid slurry is prepared into the blank with non-dendritic structure earlier.According to the product size blanking, then blank is reheated semi-solid temperature and be shaped again, be commonly called thixotropic forming (Thixo-forming or Thixo-moulding).For thixotropic forming, can keep certain shape owing to have when the blank of non-dendritic structure reheats semisolid, be convenient to carry, easily be automated.Therefore, the thixotropic forming process route in industry early obtained application.For rheocasting, owing to the semi solid slurry direct forming for preparing, have the characteristics of efficient, energy-conservation, short flow process, development in recent years is very fast, and this is the direction that semi-solid processing is further applied.
Hold first semisolid international conference from nineteen ninety, held seven special international conferences so far.The characteristics of nearest three sessions are: the 5th international conference of holding in 1998 has large quantities of industrial quarters personages to participate in, and pushes the application of semi-solid processing to a climax; Many practical techniques and method have appearred in the 6th the semisolid international conference of holding in 2000; And in the 7th the semisolid international conference of holding in 2002, emerged large quantities of practical techniques and method, wherein the overwhelming majority is the novel preparation method of relevant semi-solid metal slurry.Simultaneously, also direct rheocasting or rheological molding are mentioned a quite high position.
At present, industrial widely used be the thixotropic forming process route.And it comes with some shortcomings, and is longer as flow process.For this reason, how further simplified processing process flow process and further cutting down finished cost is the basis that the promotion semi-solid processing is used widely.The preparation of semi-solid metal slurry is the core of semi-solid processing, therefore in the last few years, new technology, new technology, the new equipment of many preparation semi-solid metal slurries occurred.Aspect the preparation of semi-solid metal slurry, have the near liquidus casting of double helix paddling process, cooling chute method, control cooling velocity, new MIT method, different liquids to be mixed with method etc., below main two kinds of methods introducing wherein:
(1) cooling chute method (Cooling Slope)
Cooling chute is a Ube Co., Ltd. exploitation new technology, in European application patent.Its principle is: will be poured on a little more than the motlten metal of liquidus temperature on the cooling chute, because the cooling effect of skewed slot has tiny crystal grain forming core to grow up on chute wall, the impact of metal bath makes crystal grain break away from from chute wall and enters container.The control vessel temp, promptly slowly cooling is cooled to be incubated after certain semi-solid temperature, meets the requirements of solid volume fraction, can carry out rheological molding or thixotropic forming subsequently.
(2) " new MIT technology " method is that its technical process is by people such as the Flemings proposition of MIT: insert temperature in the alloy solution in above several years of liquidus temperature with the agitator that has cooling effect, stir.Stirred for several is after second, and melt temperature is reduced to correspondence when having only the fraction solid of several percentages, and agitator is taken out.The alloy solution owing to stir and the acting in conjunction of cooling off, caused the cold forming core of the mistake of alloy grain in the melt volume, and the solid phase alloy grain is evenly distributed in melt under liquidus temperature.Rapid again cooled alloy melt just can obtain comparatively ideal semi solid slurry.
The nearest experimental study of MIT shows that the key factor that influence forms non-dendrite semi solid slurry is the quick cooling and the heat conduction of alloy.Under certain mixing speed, can obtain microstructure of semisolid, further improve mixing speed and do not have much affect, and when mixing time is 2 seconds, just can produce non-dendrite semi solid slurry producing spherical particle.When alloy temperature was lower than liquidus temperature, stirring did not have much affect to final microstructure.
The major defect of above-mentioned two kinds of methods and equipment thereof is, thereby high-temperature fusant easily contacts and the wayward quality that influences product of intensity of cooling with air; In addition, need additionaling power, strengthen production cost.
Summary of the invention
The purpose of this invention is to provide that a kind of technology is simple, the needs of the requirement that adapts to various different-alloy solutions and flow, avoid high-temperature fusant to contact and the method for preparing semi-solid alloy slurry of oxidation with air.
Another object of the present invention provides the equipment that a kind of intensity of cooling controllability is good, do not need the preparation semi-solid alloy slurry of additionaling power, the requirement that can adapt to various different-alloy solutions and flow needs.
For achieving the above object, the present invention takes following technical scheme:
A kind of method for preparing semi-solid alloy slurry, this method comprises the steps:
(1) with alloy in smelting furnace after the melting, the alloy melt temperature controls to the above 100-150 of its liquidus temperature ℃, melt changes over to and leaves standstill in the stove, carries out refining and slagging-off, and the melt temperature after the refining is adjusted to the above 40-60 of its liquidus temperature ℃;
(2) again melt is injected the container of a splendid attire metal bath, the outlet of container bottom connects the cold pipe of damping, the fall head of control melt in container is 500m-800mm, has certain flow velocity (deciding according to the different-alloy melt) to guarantee the melt notes in the cold pipe of damping;
(3) adopt the cold pipe of the damping that is provided with the body of rod in it with stirring action, and cooling water pipe and heater coil have been installed at the tube wall of the cold pipe of damping, by water velocity and water temperature in the control cooling water pipe, make melt cooling via the cold pipe of damping, thereby making the melt temperature that flows out the cold pipe of damping is the following 1-10 of liquidus temperature ℃ (actual temp is decided according to alloy), continuously inject solution from leaving standstill stove to container, to keep the fall head in the container, alloy melt is during via the cold pipe of damping, being subjected to the stirring of the body of rod, is that semi-solid alloy slurry is more even thereby make the slurry that flows out the cold pipe of damping.
In the method for the invention, metal bath flows into the cold pipe of damping from the container of the cold pipe of damping top, flow out the cold pipe of damping again, the alloy solution is cooled in the process via the cold pipe of damping, by the cooling velocity of the cold pipe of control damping, obtain to set the semi-solid alloy slurry of solid volume fraction in the cold pipe outlet of damping to alloy melt.Continuously inject metal bath from leaving standstill stove to the container of the cold pipe of damping top, to keep the Metal Melting scale of construction of cubitainer, i.e. fall head, thereby the stable flowing velocity of maintenance alloy melt.By control cooling water water temperature and flow, can control the cooling velocity of the cold pipe alloy melt of the damping of flowing through.Simultaneously, alloy melt is subjected to the stirring of the damping body of rod during via the cold pipe of damping, makes the semi-solid alloy slurry that flows out the cold pipe of damping distribute comparatively even.
The method for preparing semi-solid alloy slurry of the present invention is that the above 40-60 of liquidus temperature ℃ alloy solution is entered the cold pipe of damping from the container of larger sectional area, and by the fall head of control alloy solution in container and the flow of control alloy solution in the cold pipe of damping, the body of rod can produce stirring action to alloy melt simultaneously.Again because, be provided with cooling system around the cold pipe of damping, promptly be provided with cooling tube in the tube wall, can regulate the cooling velocity of alloy melt effectively.The alloy solution is during by the cold pipe of damping, because the cold tube section area of damping is less, the flowing velocity of alloy melt in cold pipe is very fast.The alloy solution is during by the cold pipe of damping, and the alloy solution forms many tiny nucleus under the cooling of tube wall.After nucleus forms, will grow up rapidly, because the impact flow of alloy melt makes the crystal grain of growing up to certain size enter alloy melt from the tube wall disengaging.When the body of rod of alloy melt by at the cold pipe of damping, alloy melt is stirred, thereby obtains semi solid slurry uniformly.The semi solid slurry that obtains flows into the container of below.Semi solid slurry can directly carry out rheocasting or rheological molding, also can be prepared into the blank of non-dendritic structure.
In the method for the invention, in described step (3), when the intensity of cooling of the cold pipe of damping excessive, when causing the cold inside pipe wall of damping the bulk-solidifying thing to occur, can open and be located at the outer heating system of the cold pipe pipe of damping,, guarantee operate as normal by heater coil heat fused coagulum.
In the method for the invention, in described step (2), in the container processes of melt being injected the splendid attire metal bath, according to the material of alloy melt, the protective gas that can in this container, charge into.
The employed equipment of method for preparing semi-solid alloy slurry of the present invention includes smelting furnace, leaves standstill stove, the container of the larger sectional area of splendid attire metal bath, the lower part outlet of container connects the cold pipe of damping, be provided with the body of rod in the cold pipe of damping, and cooling water pipe and heater coil be installed at the tube wall of the cold pipe of damping with stirring action.
In equipment of the present invention, the container of splendid attire metal bath can be open type, also can be closed.The closed protective gas that is connected with is protected.Leave standstill between stove and the container and be provided with control valve, regulate flow.
In equipment of the present invention, smelting furnace, leave standstill stove and be conventional equipment.The cold pipe of damping can adopt multiple mode, can be the cold pipe of flat pipe type damping of band shunting wedge or the cold pipe of damping of band helicla flute circular cone core bar, and still, the present invention is not limited to this dual mode, as the combination of above-mentioned two kinds of forms.
In equipment of the present invention, the cold pipe of described damping is the cold pipe of flat pipe type damping of band shunting wedge, and it is shaped as the flat tubulose the cold pipe of damping, and the body of rod with stirring action is provided in a side of the below of the cold pipe of damping, promptly is located at the exit.The cross section of tapered shaft is a rhombus, and the axis of tapered shaft is parallel to the long limit of flat pipe, is installed in the centre of outlet.The cold pipe of damping is the flat pipe, and purpose is the contact area that increases metal bath and cold pipe, thereby increases the cooling effect to the metal bath that flows.Tapered shaft can form damping action.
In equipment of the present invention, the cold pipe of described damping is the cold pipe of damping of band helicla flute circular cone core bar, and its cross section is circular, and the junction that the cold pipe of this damping is connected with last cubitainer is a conical section.The body of rod with stirring action is the conical core bar of band spiral fluted.The conical core bar of band helicla flute is made up of conical section and cylindrical section, and cylindrical section is placed in the cold pipe of damping, and the cold bore of the diameter of cylindrical section and damping is gapped.The cone angle of the cold pipe of the cone angle of core bar conical section and damping top conical section has certain differential seat angle.The conical section of core bar and cylindrical section all have helicla flute, and the density of material of core bar is greater than the density of employed alloy melt.When being applied to aluminium alloy, core bar can adopt titanium alloy material.
In equipment of the present invention, described cooling water pipe and the heater coil that is placed in the cold pipe outer tube wall of damping is inside and outside arrangement, and cooling water pipe is closely to contact with tube wall, keeps good heat-conductive characteristic.Cooling water pipe and heater coil can divide two groups or three groups.Can regulate very easily along the cold tubular axis of damping to intensity of cooling or heating efficiency distribute so that better regulate along the cooling velocity or the heating efficiency of the cold tube axis direction of damping.Every group of cooling water pipe and heater coil can independently be controlled.Owing to be provided with cooling system around the cold pipe of damping, and cooling water pipe divides two groups or three groups, therefore, can regulate the cooling velocity of alloy melt effectively, promptly regulates the solid volume fraction of exit semi solid slurry.Excessive when the intensity of cooling of the cold pipe of damping, when causing the cold inside pipe wall of damping the bulk-solidifying thing to occur, can start the heating system that is located at outside the cold pipe pipe of damping, the fusing coagulum guarantees operate as normal.From the below outlet of the cold pipe of damping, can obtain to set the semi solid slurry of solid volume fraction.Further control the vessel temp of the cold pipe of damping below, can further regulate the solid volume fraction of semi solid slurry.
In equipment of the present invention, the heater coil of the cold tube wall of described damping is looped around the nexine in the tube wall, and cooling tube is looped around the skin in the tube wall.The effect of heater coil: the one, can regulate cooling effect accurately; The 2nd, can heat fused and the residual alloy of clearing up in the cold pipe of damping.
Advantage of the present invention is:
1, alloy melt is to flow in the cold pipe of the damping of a sealing, has avoided high-temperature fusant to contact and oxidation with air, is specially adapted to magnesium alloy.This method can effectively prevent the burning and the oxidation of magnesium alloy.
2, the structure of the cold pipe of damping can be diversified, can adapt to the needs of various requirement and flow.
3, the cold pipe of damping is the system of a sealing, and its intensity of cooling controllability is good.
4, the cold pipe method of damping has the characteristics of cooling chute method, does not need additionaling power.
5, the cold Guan Fayu of damping of the present invention " new MIT technology " compares, and has advantage of simple technology; Compare with the cooling chute method, it is good to have controllability, and metal bath does not contact and the advantage of oxidation with air.
Description of drawings
Fig. 1 is the cold pipe schematic diagram of flat pipe type damping of band shunting wedge
Fig. 2 is the A-A cutaway view of Fig. 1
Fig. 3 is the cold pipe schematic diagram of damping of band helicla flute circular cone core bar
The specific embodiment
The present invention prepares the employed equipment of the method for semi-solid alloy slurry.This equipment includes smelting furnace (not shown), leaves standstill stove (label 6 among Fig. 1, Fig. 3); the outlet of leaving standstill stove 6 connects the import on the top of the container of a splendid attire metal bath (label 4 among Fig. 1, Fig. 3); container 4 can be provided with the import and the control valve (not shown) of protective gas pipe (label 7 among Fig. 1, Fig. 3); the lower part outlet of container connects the cold pipe of damping; be provided with the body of rod in the cold pipe of damping, and cooling water pipe (label 2 among Fig. 1, Fig. 3) and heater coil (label 3 among Fig. 1, Fig. 3) be installed at the tube wall of the cold pipe of damping with stirring action.
In equipment of the present invention, the cold pipe of damping adopts the cold pipe of flat pipe type damping of band shunting wedge, as shown in Figure 1 and Figure 2, the cold pipe of flat pipe type damping of band shunting wedge of the present invention includes the cold pipe 1 of flat tubulose damping, the cross section of the cold pipe 1 of damping is the prolate circle, be that its two long limit is that straight flange, two minor faces are the circular arc limit, the prolate circular cross-section can increase the girth in cross section, thereby has increased the cooling effect of tube wall.The tube wall that is looped around the flat pipe has been installed cooling water pipe 2 and heater coil 3, cooling water pipe 2 and heater coil 3 are inside and outside arrangement, heater coil 3 is looped around the nexine in the tube wall, and cooling tube 2 is looped around the skin in the tube wall, and two groups or three groups of cooling water pipe 2 and heater coils 3 minutes.There is the container 4 of the larger sectional area of a splendid attire metal bath top of the cold pipe 1 of this damping, this container 4 with leave standstill stove 6 and be connected.The ratio of cold pipe 1 sectional area of the sectional area of container 4 and damping should be greater than 10, and the ratio of cold pipe 1 sectional area of the sectional area of container 4 and damping is preferably 10-30.The below of the cold pipe 1 of damping, be that the exit is provided with the tapered shaft 5 that top is wedge shape, the axis of tapered shaft 5 is parallel to the long limit of flat pipe, be installed in the centre of outlet, the cross section of tapered shaft 5 is a rhombus, two cornerwise ratios advise that greater than 4 two cornerwise ratios are 4-8, and it is excessive that four angles are circular arc.
As shown in Figure 1 and Figure 2, be equipped with in the method for semi-solid alloy slurry in the cold control of flat pipe type damping of adopting band shunting wedge, with alloy in smelting furnace (not shown) after the melting, the alloy melt temperature controls to the above 110-150 of its liquidus temperature ℃, melt changes over to and leaves standstill in the stove 6, carry out refining and slagging-off, the melt temperature after the refining is adjusted to the above 40-60 of its liquidus temperature ℃.Again melt is injected the container 4 of splendid attire metal bath, and keep the height of the liquid level stabilizing of container 4.Can be filled with protective gas in this container, the outlet of container bottom connects the cold pipe 1 of damping, and the fall head of control melt in container 4 is 500-800mm, so that melt has certain flowing velocity at the cold pipe of damping.Adopt the cold pipe of damping of the cold pipe of flat pipe type damping of band shunting wedge, by the water velocity in the control cooling water pipe 2 and the temperature of cooling water, can reach the intensity of cooling of the cold pipe of control damping to metal bath, make the alloy melt temperature that flows out from the cold pipe of damping be lower than the liquidus temperature several years (deciding), finish the nucleation process of alloy melt substantially according to alloy and instructions for use.Continuously inject solution from leaving standstill stove 6, guarantee to flow into the solution amount of the cold pipe 1 of damping to container 4.The alloy solution remains above-mentioned fall head in container 4, alloy melt is via the stirring action of the cold pipe 1 of damping by tapered shaft 5, and the slurry that flows out from the cold pipe 1 of damping is semi-solid alloy slurry uniformly.
In preparing the method for semi-solid alloy slurry, the alloy melt in the airtight container 4 should keep certain height (500-800mm).The height of alloy melt is closely related in alloy melt flowing velocity in the cold pipe 1 of damping and the container 4, and the height of alloy melt is the driving force that alloy melt flows in the cold pipe 1 of damping in the container 4, therefore requires in the container 4 liquid level stable.Concrete liquid level is relevant with alloy and technological requirement, sees following embodiment 1-4 for details.
In equipment of the present invention, the cold pipe of damping adopts the cold pipe of damping of band helicla flute circular cone core bar, as shown in Figure 3, the cold pipe of damping of band helicla flute circular cone core bar of the present invention includes the cross section and is the circular cold pipe 11 of damping, the top of the cold pipe 11 of this damping is provided with the container 4 of the larger sectional area of a splendid attire metal bath, the junction that the cold pipe 11 of this damping is connected with container 4 is a conical section 13, is provided with the conical core bar 14 of band helicla flute in conical section 13 and the cold pipe 11 of damping.The conical core bar 14 of this band helicla flute is made up of conical section and cylindrical section, cold pipe 11 internal diameters of the diameter of cylindrical section and damping are for there being certain clearance, decide according to alloy melt and caliber in the gap of the cylindrical section of core bar 14 and the cold pipe of damping, and common monolateral gap is in the 2-8mm scope; The cone angle of the cold pipe 11 top conical section 13 of the cone angle of conical section and damping has a differential seat angle, the coning angle of the conical section of core bar 14 than the coning angle of the conical section 13 of the cold pipe of damping 11 tops little 20 °～50 °; The conical section of core bar 14 and cylindrical section all have helicla flute, and the conical section of core bar and the spiral fluted lift angle degree on the cylindrical section are greater than 60 °.Cold pipe 11 length of damping are relevant with the diameter of the cold pipe 11 of damping according to the character of alloy melt, but cold pipe 11 length of damping should be greater than 300mm, cold pipe 11 length of damping are preferably 300-800mm, the length of the cylindrical section of core bar 14 be generally cold pipe 11 length of damping 1/3 to 1/2 between.The material of band helicla flute circular cone core bar 14 is high-strength, heat-resisting, high-abrasive material, and the density of material of core bar 14 is greater than the density of alloy melt, as adopting titanium alloy material.And cooling water pipe 2 and heater coil 3 have been installed at the tube wall of the cold pipe 11 of damping, cooling water pipe 2 and heater coil 3 are inside and outside arrangement, heater coil is looped around the nexine in the tube wall, and cooling tube is looped around the skin in the tube wall, and two groups or three groups of cooling water pipe 2 and heater coils 3 minutes.
Be equipped with in the method for semi-solid alloy slurry in the cold control of damping of adopting band helicla flute circular cone core bar, basically to be equipped with the method for semi-solid alloy slurry identical with the cold control of flat pipe type damping of above-mentioned employing band shunting wedge, its different place is, be to adopt 14 pairs of alloy melts of band helicla flute circular cone core bar to produce stirring action, the density of material of band helicla flute circular cone core bar 14 is bigger than the density of metal bath, core bar 14 is under the impact of metal bath, because the circumferential component effect on the band spiral fluted inclined-plane, belt carcass bar 14 is rotated, metal bath also rotates in the opposite direction simultaneously, thereby plays the stirring action to metal bath.Thereby can obtain semi solid slurry uniformly.
As shown in Figure 1 and Figure 2, AZ91 alloy liquid phase line temperature is 596 ℃.After the melting, the alloy melt temperature controls to about 740 ℃ alloy in smelting furnace, and melt changes over to and leaves standstill in the stove 6, carries out refining and slagging-off, melt temperature is adjusted to about 640 ℃ after the refining.Melt is injected the container of the cold pipe of damping 1 top, container 4 is of a size of 500mm * 300mm * 800mm (length * wide * height) again.Fall head in the control container 4 keeps pressure head at 580mm, and the alloy melt in the container 4 flows into the cold pipe 1 of damping under the effect of deadweight, and the flow velocity of the cold pipe outlet of damping is greater than 20m/min.In container 4, feed a spot of protective gas.The sectional dimension of the cold pipe 1 of damping is 150mm * 50mm (long * wide), and length is 500mm.Tapered shaft 5 is of a size of 150mm * 45mm * 200mm (length * wide * height), and the wedge shape height is 200mm, and top is wedge shape.The water velocity of control cooling water can obtain semi solid slurry solid volume fraction that the cold pipe of damping comes out at 8-15%.Further control the vessel temp of the cold pipe of damping below, the solid volume fraction that can regulate semi solid slurry is 30%, carries out rheological molding then.
As shown in Figure 1 and Figure 2, AlSi7Mg alloy liquid phase line temperature is 635 ℃.After the melting, the alloy melt temperature is about 780 ℃ to alloy in smelting furnace, and melt changes over to and leaves standstill in the stove 6, carries out refining and slagging-off, and the melt temperature after the refining is about 680 ℃.Melt is injected the container of the cold pipe of damping 1 top, container 4 is of a size of 500mm * 300mm * 800mm (length * wide * height) again.Fall head in the control container 4 keeps pressure head at 550mm, and the alloy melt in the container 4 flows into the cold pipe 1 of damping under the effect of deadweight, and the flow velocity of the cold pipe outlet of damping is greater than 20m/min.The sectional dimension of the cold pipe 1 of damping is 150mm * 50mm (long * wide), and length is 500mm.Tapered shaft 5 is of a size of 150mm * 45mm * 200mm (length * wide * height), and the wedge shape height is 200mm, and top is wedge shape.The water velocity of control cooling water can obtain the semi solid slurry solid volume fraction that the cold pipe of damping comes out and can reach 12-18%.Further control the vessel temp of the cold pipe of damping below, the solid volume fraction that can regulate semi solid slurry is 30%, carries out rheological molding then.
As shown in Figure 3, AZ91 alloy liquid phase line temperature is 596 ℃.After the melting, the alloy melt temperature is about 740 ℃ to alloy in smelting furnace, and melt changes over to and leaves standstill in the stove 6, carries out refining and slagging-off, and the melt temperature after the refining is about 640 ℃.Melt is injected the container of the cold pipe of damping 11 tops, the specification of container 4 is Ф 500mm * 750mm (diameter * highly) again.Fall head in the control container 4 keeps pressure head at 550mm.Alloy melt in the container 4 flows into the cold pipe 11 of damping under the effect of deadweight, the flow velocity of the cold pipe outlet of damping is greater than 16m/min.In container 4, feed a spot of protective gas.Cold pipe 11 specifications of damping are Ф 80mm * 500mm (diameter * highly), and the cylindrical section of core bar 14 is Φ 76mm, and the monolateral gap of cold pipe of damping and core bar is 2mm.The conical section 13 of the cold pipe of the conical section of core bar 14 and damping 11 tops matches, and the coning angle of core bar 14 conical section is littler 45 ° than the coning angle of the conical section 13 of cold pipe top.The conical section of circular cone core bar and cylindrical section spiral fluted lift angle are 65 °, and helicla flute is a dovetail groove.The material of circular cone core bar 14 adopts titanium alloy material.Core bar conical section height is 100mm, and the length of cylindrical section is 200mm.The water velocity of control cooling water, obtainable semi solid slurry phase volume fraction is 10-18%.Further control the vessel temp of the cold pipe of damping below, the solid volume fraction that can regulate semi solid slurry is 30%, carries out rheological molding then.
As shown in Figure 3, AlSi7Mg alloy liquid phase line temperature is 635 ℃.After the melting, the alloy melt temperature is about 780 ℃ to alloy in smelting furnace, and melt changes over to and leaves standstill in the stove 6, carries out refining and slagging-off, and the melt temperature after the refining is about 680 ℃.Melt is injected the container of the cold pipe of damping 11 tops, the specification of container 4 is Ф 500mm * 750mm (diameter * highly) again.Fall head in the control container 4 keeps pressure head at 550mm.Alloy melt in the container 4 flows into the cold pipe 11 of damping under the effect of deadweight, the flow velocity of the cold pipe outlet of damping is greater than 16m/min.Cold pipe 11 specifications of damping are Ф 80mm * 500mm (diameter * highly), and the cylindrical section of core bar 14 is Φ 76mm, and the monolateral gap of cold pipe of damping and core bar is 2mm.The conical section 13 of the cold pipe of the conical section of core bar 14 and damping 11 tops matches, and the coning angle of core bar 14 conical section is littler 45 ° than the coning angle of the conical section 13 of cold pipe top.The conical section of circular cone core bar and cylindrical section spiral fluted lift angle are 65 °, and helicla flute is a dovetail groove.The material of circular cone core bar 14 adopts titanium alloy material.Core bar conical section height is 100mm, and the length of cylindrical section is 200mm.The water velocity of control cooling water, obtainable semi solid slurry phase volume fraction is 15-20%.Further control the vessel temp of the cold pipe of damping below, the solid volume fraction that can regulate semi solid slurry is 30%, carries out rheological molding then.
The prepared semi solid slurry of method for preparing semi-solid alloy slurry of the present invention can be directly used in die casting, extruding or rolling.
Claims (8)
1, a kind of method for preparing semi-solid alloy slurry, it is characterized in that: this method comprises the steps:
(1) with alloy in smelting furnace after the melting, the alloy melt temperature controls to the above 100-150 of its liquidus temperature ℃, melt changes over to and leaves standstill in the stove, carries out refining and slagging-off, and the melt temperature after the refining is adjusted to the above 40-60 of its liquidus temperature ℃;
(2) melt is injected the container of a splendid attire metal bath, the outlet of container bottom connects the cold pipe of damping again, and the fall head of control melt in container is 500m-800mm, annotates have certain flow velocity in the cold pipe of damping to guarantee melt;
(3) adopt the cold pipe of the damping that is provided with the body of rod in it with stirring action, and cooling water pipe and heater coil have been installed at the tube wall of the cold pipe of damping, by water velocity and water temperature in the control cooling water pipe, make melt cooling via the cold pipe of damping, thereby making the melt temperature that flows out the cold pipe of damping is the following 1-10 of liquidus temperature ℃, continuously inject solution from leaving standstill stove to container, to keep the fall head in the container, alloy melt is during via the cold pipe of damping, being subjected to the stirring of the body of rod, is that semi-solid alloy slurry is more even thereby make the slurry that flows out the cold pipe of damping.
2, the method for preparing semi-solid alloy slurry according to claim 1, it is characterized in that: in described step (3), when the intensity of cooling of the cold pipe of damping excessive, when causing the cold inside pipe wall of damping the bulk-solidifying thing to occur, can open and be located at the outer heating system of the cold pipe pipe of damping, by heater coil heat fused coagulum, guarantee operate as normal.
3, the method for preparing semi-solid alloy slurry according to claim 1; it is characterized in that: in described step (2); in the container processes of melt being injected the splendid attire metal bath, according to the material of alloy melt, the protective gas that can in this container, charge into.
4, the equipment of the described method use of a kind of claim 1, it is characterized in that: this equipment includes smelting furnace, leaves standstill stove, the container of the larger sectional area of splendid attire metal bath, the lower part outlet of container connects the cold pipe of damping, be provided with the body of rod in the cold pipe of damping, and cooling water pipe and heater coil be installed at the tube wall of the cold pipe of damping with stirring action.
5, equipment according to claim 4, it is characterized in that: the cold pipe of described damping is the cold pipe of flat pipe type damping of band shunting wedge, it is shaped as the flat tubulose, the body of rod with stirring action is the tapered shaft of wedge shape, be located at the below of the cold pipe of damping, promptly be located at the exit, the axis of tapered shaft is parallel to the long limit of flat pipe, is installed in the centre of outlet.
6, equipment according to claim 4, it is characterized in that: the cold pipe of damping is the cold pipe of damping of band helicla flute circular cone core bar, its cold tube section is circular, the junction that the cold pipe of this damping is connected with last cubitainer is a conical section, the body of rod with stirring action is the conical core bar of band spiral fluted, the conical core bar of this band helicla flute is made up of conical section and cylindrical section, be placed in the cold pipe of conical section and damping, the diameter of cylindrical section is gapped the cooperation with the cold bore of damping, the conical section of the cold pipe of conical section and damping top is for there being cone angle poor, the conical section of core bar and cylindrical section all have helicla flute, and the density of material of core bar is greater than the density of employed alloy melt.
7, according to claim 5 or 6 described equipment, it is characterized in that: the cooling water pipe and the heater coil of the cold tube wall of described damping are inside and outside arrangement, and cooling water pipe and heater coil divide two groups or three groups.
8, equipment according to claim 6 is characterized in that: for the preparation aluminium alloy semi-solid slurry, the material of described core bar adopts titanium alloy material.
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| CNB2004100391923A CN1308102C (en) | 2004-02-20 | 2004-02-20 | Method of preparing semisolid alloy slurry and its equipment |
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| CN100569414C (en) * | 2007-01-29 | 2009-12-16 | 南昌大学 | Process for preparing semi-solid metal slurry or billet by multi-tube dispersion and strong cooling |
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| JP3474017B2 (en) * | 1994-12-28 | 2003-12-08 | 株式会社アーレスティ | Method for producing metal slurry for casting |
| US5881796A (en) * | 1996-10-04 | 1999-03-16 | Semi-Solid Technologies Inc. | Apparatus and method for integrated semi-solid material production and casting |
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| CN113798464A (en) * | 2021-08-11 | 2021-12-17 | 昆明理工大学 | Split type totally-enclosed melt constraint flow induced nucleation semi-solid slurry preparation device |
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