CN216176486U - Large-specification magnesium alloy round billet semi-continuous casting device - Google Patents
Large-specification magnesium alloy round billet semi-continuous casting device Download PDFInfo
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- CN216176486U CN216176486U CN202122430259.8U CN202122430259U CN216176486U CN 216176486 U CN216176486 U CN 216176486U CN 202122430259 U CN202122430259 U CN 202122430259U CN 216176486 U CN216176486 U CN 216176486U
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Abstract
The utility model provides a semi-continuous casting device of big specification magnesium alloy round billet, belong to magnesium alloy round billet casting technical field, can solve central crackle or surface crack, composition segregation problem and the casting safety problem that current big direct magnesium alloy round billet casting in-process caused because of casting stress inhomogeneous scheduling problem, including the water-cooled crystallizer, the top of water-cooled crystallizer is equipped with the flow distribution disc, the top of water-cooled crystallizer is equipped with the support, the support is connected with the flow distribution disc through reinforcing bar, the both ends of support are equipped with the lead screw that is used for adjusting the flow distribution disc height respectively, the top of flow distribution disc is equipped with the protection gas device, water-cooled crystallizer below is equipped with two cold charge devices, two cold charge devices below is equipped with three cold charge devices, two cold charge devices and three cold charge devices loop through the screw and are connected with the water-cooled crystallizer, the bottom of water-cooled crystallizer is equipped with the dummy bar head. By using the device, the diameter of the large-diameter semi-continuous magnesium alloy product can reach 800-1200 mm.
Description
Technical Field
The utility model belongs to the technical field of magnesium alloy round billet casting, and particularly relates to a large-specification magnesium alloy round billet semi-continuous casting device.
Background
The magnesium alloy is regarded as the lightest engineering metal material, is known as the green engineering material of the 21 st century, and has wide application prospect in the fields of aerospace, rail transit, and the like. With the increase of magnesium alloy application, large-size magnesium alloy round billets are applied to large-size capital construction corrosion prevention and large-size equipment casings, or are applied to the fields of traffic, aerospace and the like after being forged and pressed. However, as the casting diameter increases, particularly at a diameter of 800mm or more, the problems of center cracks, surface cracks, and component segregation increase significantly. The problem of casting safety increases. The traditional small-diameter casting device cannot meet the production and use requirements of products with the diameter of more than 800 mm.
Disclosure of Invention
The utility model provides a large-size magnesium alloy round billet semi-continuous casting device aiming at the problems of central cracks or surface cracks, component segregation and casting safety caused by the problems of uneven casting stress and the like in the casting process of a large direct magnesium alloy round billet, and successfully casts a qualified large-diameter semi-continuous magnesium alloy rod.
The utility model adopts the following technical scheme:
the utility model provides a semi-continuous casting device of big specification magnesium alloy round billet, including the water-cooled crystallizer, the top of water-cooled crystallizer is equipped with the flow distribution plate, the top of water-cooled crystallizer is equipped with the support, the support is connected through reinforcing bar and flow distribution plate, the both ends of support are equipped with the lead screw that is used for adjusting the flow distribution plate height respectively, the top of flow distribution plate is equipped with the shielding gas device, the water-cooled crystallizer below is equipped with two cold charge, two cold charge below is equipped with three cold charge, two cold charge and three cold charge loop through the screw rod and be connected with the water-cooled crystallizer, the bottom of water-cooled crystallizer is equipped with the dummy bar head.
Furthermore, a spiral inner container is arranged inside the water-cooled crystallizer, a water inlet and a water outlet are respectively arranged at two ends of the water-cooled crystallizer, the water inlet is located at the bottom of one end of the water-cooled crystallizer, the water outlet is located at the top of the other end of the water-cooled crystallizer, and the water inlet and the water outlet are respectively in spiral connection with the inner container.
Furthermore, the flow distribution plate comprises a disc and a circular ring, the disc is positioned in the center of the circular ring, the disc and the circular ring are connected through a connecting bridge, and the inner side wall and the outer side wall of the circular ring are respectively provided with a plurality of liquid outlet holes.
Furthermore, the diameter of the liquid outlet hole is 10-20 mm.
Furthermore, the protective gas device comprises an annular protective gas ring I and a protective gas ring II, wherein the annular protective gas ring I is located 1cm above the diverter disc, and the protective gas ring II is located on the edge of the water-cooled crystallizer.
Further, the secondary cooling device comprises an annular secondary cooling water tank, water inlets are formed in two ends of the secondary cooling water tank respectively, water outlet holes are formed in the bottom of the secondary cooling water tank, and the water outlet holes are inclined by 40 degrees towards the blank direction.
Further, the three-cooling device comprises an annular three-cooling water tank, water inlets are formed in two ends of the three-cooling water tank respectively, water outlet holes are formed in the bottom of the three-cooling water tank, and the water outlet holes are inclined by 40 degrees towards the blank direction.
Furthermore, 4 exhaust holes are uniformly arranged on the dummy bar head, and a dovetail groove is formed in the edge of the dummy bar head.
The utility model has the following beneficial effects:
1. by using the device, the diameter of the large-diameter semi-continuous magnesium alloy product can reach 800-1200 mm.
2. The utility model can reduce the casting stress of the blank by adopting the separation of primary cooling and secondary cooling, and realizes the respective adjustment of the primary cooling and the secondary cooling. And adding cold water. Compared with the traditional crystallizer integrating one cooling and two cooling, the crystallizer reduces the generation of central cracks and edge cracks.
3. Compared with the traditional circular integral splitter plate, the splitter plate is improved, so that the liquidity of the liquid is met, and the uniform flow, the homogenization and the uniform heating are realized. Greatly reducing the segregation of the components.
4. The utility model also adds the bracket of the diverter plate, so that the diverter plate keeps the original shape, and the problems of uneven liquid flow, central cracks, surface cracks and the like of blanks and the like caused by deformation of the diverter plate due to uneven cooling and heating are greatly reduced. The method is an important breakthrough for overcoming large-diameter magnesium alloy products, and fills the blank of a large-diameter semi-continuous magnesium alloy blank casting device.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic structural view of the diverter tray of the present invention;
fig. 4 is a schematic perspective view of the diverter tray of the present invention;
FIG. 5 is a schematic top view of the stand of the present invention;
FIG. 6 is a schematic structural view of a shielding gas device according to the present invention;
FIG. 7 is a schematic bottom view of the secondary and tertiary cooling apparatuses of the present invention;
wherein: 1-water cooling crystallizer; 2-a diverter tray; 3-a scaffold; 4-reinforcing steel bars; 5-a screw rod; 6-a shielding gas device; 7-a screw; 8-dummy bar head; 9-inner container; 10-a water inlet; 11-a water outlet; 12-a disc; 13-a circular ring; 14-a connecting bridge; 15-liquid outlet holes; 16-a protective balloon I; 17-protective gas ring II; 18-secondary cooling water tank; 19-a tertiary cold water tank; 20-a dovetail groove; 21-air vent.
Detailed Description
The utility model is further explained with reference to the accompanying drawings.
As shown in the figure, the large-size magnesium alloy round billet semi-continuous casting device comprises a water-cooled crystallizer 1, a flow distribution disc 2 is arranged above the water-cooled crystallizer 1, a support 3 is arranged above the water-cooled crystallizer 1, the support 3 is connected with the flow distribution disc 2 through reinforcing steel bars 4, lead screws 5 used for adjusting the height of the flow distribution disc are respectively arranged at two ends of the support 3, a shielding gas device 6 is arranged above the flow distribution disc 2, a secondary cooling device is arranged below the water-cooled crystallizer 1, a tertiary cooling device is arranged below the secondary cooling device, the secondary cooling device and the tertiary cooling device are sequentially connected with the water-cooled crystallizer 1 through screw rods 7, and a dummy ingot head 8 is arranged at the bottom of the water-cooled crystallizer 1.
The water-cooled crystallizer is provided with a water inlet and a water outlet, and the lower part of the water-cooled crystallizer is not provided with a water outlet hole. The inner container is provided with a spiral, a water inlet is arranged below the inner container, enters from the spiral and finally reaches a water outlet at the upper part of the crystallizer to flow out.
The splitter plate mainly comprises two parts, namely a disk in the middle and a circular ring outside. The disc and the ring are connected by a bridge. The disc is not provided with a liquid outlet. Liquid outlet holes are arranged inside and outside the circular ring, and the aperture is between 10 and 20 mm.
The shunt plate is large in thermal deformation, so that a support is arranged above the shunt plate. The steel bar is used for reinforcing the shunting plate, and the screw rod is used for adjusting the height of the shunting plate.
And a protective gas device is fixed above the splitter disc and below the bracket, and the protective gas device is separated from the splitter disc. The number of the protective air rings is two, an annular protective air ring is arranged at a position 1cm above the splitter disc, another protective air ring is arranged on a small support of the splitter disc and the edge of the crystallizer, and the other protective air ring is placed on the edge of the water-cooled crystallizer by a support sheet.
A secondary cooling device is arranged below the crystallizer and mainly comprises a secondary cooling water tank and two water inlets. The secondary cooling water tank is arranged below the water-cooled crystallizer and is in a circular ring shape. A water outlet hole is arranged below the secondary cooling water tank, and the angle of the water outlet hole inclines to 40 degrees towards the blank direction
A third cooling device is arranged below the second cooling device. The three-cold device mainly comprises a three-cold water tank and two water inlets. The water tank is arranged below the water-cooled crystallizer and is in a circular ring shape. A water outlet hole is arranged below the water tank, and the angle of the water outlet hole inclines to 40 degrees towards the blank direction.
And a dummy bar head is arranged below the water-cooled crystallizer. The dummy ingot head is provided with an exhaust hole and the edge part is provided with a dovetail groove with a small angle. The demoulding is convenient.
The using method of the utility model is as follows:
(1) after the magnesium alloy in the crucible is subjected to alloying, refining and standing, obtaining qualified magnesium alloy melt for casting;
(2) the dummy bar head and the splitter plate are fully preheated by an oxygen-acetylene gun.
(3) And (4) introducing water into the water-cooled crystallizer, the secondary cooling and the tertiary cooling. Adjusting water quantity of crystallizer, and cooling water in 5-10m3H is used as the reference value. Secondary cooling water in the range of 3-15 m3H is used as the reference value. The three-cold water is 10-20m3/h。
(4) Introducing protective gas through a gas protection device to protect the splitter plate and the melt in the water-cooled crystallizer and avoid the oxidation and combustion of the melt; the protective gas is R-134a and CO2Wherein the volume percentage of R-134a is 1-2%.
(5) When the bottom is paved, a stainless steel slag skimming plate is needed to scrape impurities in the splitter plate, and the magnesium alloy melt is guided to uniformly flow into the crystallizer from the splitter holes and the splitter ports. Stirring the magnesium alloy liquid by a slag removing plate to ensure that the magnesium alloy liquid is uniformly paved on the dummy ingot head as much as possible.
(6) And when the magnesium liquid level reaches the start-up line, starting the casting machine. The start-up speed increases with casting. The normal speed is 18-28 mm/min
(7) And when the vehicle speed is normal, buckling a casting protective cover device, and controlling the casting liquid level.
(8) And when the casting length reaches the limit of the casting machine, plugging the plug, stopping pouring the magnesium alloy melt, immediately stopping (stopping the casting machine), taking out the splitter disc, and taking out the casting pipe.
(9) And closing the cooling water and the protective gas when the upper surface of the blank reaches below 100 ℃. Then the car is started to pull the blank downwards out of the crystallizer. And pushing the casting trolley away, and hoisting out the magnesium alloy blank to obtain the qualified blank.
Example 1
The inner sleeve of the crystallizer in this embodiment is made of aluminum alloy.
The shunt disk sleeve in this embodiment is made of stainless steel.
The vertical distance between the upper edge of the splitter plate and the upper surface of the die is 40-70mm in the embodiment.
In this embodiment, the gas protection device is connected with the protection gas tank.
The shielding gases in this example were R-134a and CO2Wherein the volume percentage of R-134a is 1-2%.
In this embodiment, the secondary and tertiary cold water tanks are made of stainless steel and are circular tubes to form an annular device.
In the embodiment, the diameters of the secondary cooling water hole and the tertiary cooling water hole are within the range of 1-3 mm.
In the embodiment, the included angle between the axes of the secondary cooling water hole and the tertiary cooling water hole and the horizontal plane ranges from 38 degrees to 40 degrees.
In the embodiment, the dummy bar head air holes are uniformly distributed on the dummy bar head, the number of the dummy bar head air holes is 4, and the diameter of the dummy bar head air holes is 15-35 mm; and the dummy bar head fixing column is welded and fixed on the casting machine.
The diameter of the AZ31B magnesium alloy round billet in the embodiment is 960mm, and the length is 3200 mm. The components by weight percentage contain 3.2 percent of Al, 1 percent of Zn, 0.2 percent of Mn and the balance of magnesium.
The semi-continuous casting method of the large-size magnesium alloy round billet adopts the device, wherein the AZ31B is carried out according to the following steps:
1) smelting pure magnesium in a resistance smelting furnace, controlling the temperature at 720-730 ℃, and adding three alloy elements of aluminum, zinc and manganese chloride by using an automatic alloying and refining integrated device. So that the components satisfy the AZ31B range.
2) After alloying, the temperature is controlled at 720-730 ℃, and flux refining and argon refining are carried out by using an automatic alloying and refining integrated device.
3) After the refined qualified magnesium alloy liquid is kept stand, the temperature is controlled to be about 700 ℃, and the casting pipe is heated to be red by using electric heating. And coating a layer of high-temperature-resistant lubricant on the surface of the crystallizer. The oxygen-acetylene gun is used for fully preheating the supporting platform and the splitter plate.
4) And (5) introducing water into the crystallizer, the secondary cooling and the tertiary cooling. The water quantity of the crystallizer is adjusted, and the first cooling water is larger, and is 7m cold due to easy cooling of AZ31B3Second cooling for 5m3H, 15m of triple cooling3/h。
5) Starting the protective gas device to start casting. The magnesium alloy liquid enters the splitter plate under the protective gas atmosphere and then enters the crystallizer.
6) When the bottom is paved, a stainless steel slag skimming plate is needed to scrape impurities in the splitter plate, and the magnesium alloy melt is guided to uniformly flow into the crystallizer from the splitter holes and the splitter ports. And (4) enabling the magnesium alloy liquid to be uniformly paved on the dummy ingot head as much as possible by using a slag removing plate.
7) And when the magnesium liquid level reaches the start-up line, starting the casting machine. The start-up speed increases with casting.
8) And finally, the speed is 25mm/min, and when the speed is normal, the casting protective cover device is buckled, and the casting liquid level is well controlled.
9) And when the casting length reaches the limit of the casting machine, plugging the plug, stopping pouring the magnesium alloy melt, immediately stopping (stopping the casting machine), taking out the splitter disc, and taking out the casting pipe.
10) And closing the cooling water and the protective gas when the upper surface of the blank reaches below 100 ℃. Then the car is started to pull the blank downwards out of the crystallizer. And pushing the casting trolley away, and hoisting out the magnesium alloy blank to obtain the qualified blank. The A1 element and the Zn element are uniformly distributed in all directions through detection.
Example 2
The method is the same as example 1, except that:
(1) the prepared large-size magnesium alloy round billet is an AZ80 semi-continuous casting round billet, and the casting temperature is 700 ℃;
(2) the diameter of the AZ80 magnesium alloy round billet is 960mm, the length is 3200mm, and the components by weight percentage contain 8.0 percent of Al, 1 percent of Zn, 0.2 percent of Mn0, and the balance of magnesium.
(3) AZ80 solidified relatively slowly, so we adjusted the cooling water. 9m of cold3Second cooling for 10m3H, 20m of cold3H is used as the reference value. The final vehicle speed was 22 mm/min. The fluidity and the forming of the magnesium liquid are ensured. And successfully casting qualified products. The detected Al element and Zn element are uniformly distributed in all directions.
Claims (8)
1. A large-specification magnesium alloy round billet semi-continuous casting device is characterized in that: including water-cooled crystallizer (1), the top of water-cooled crystallizer (1) is equipped with flow distribution disc (2), the top of water-cooled crystallizer (1) is equipped with support (3), support (3) are connected through reinforcing bar (4) and flow distribution disc (2), the both ends of support (3) are equipped with lead screw (5) that are used for adjusting the flow distribution disc height respectively, the top of flow distribution disc (2) is equipped with protective gas device (6), water-cooled crystallizer (1) below is equipped with two cold charge devices, two cold charge devices below is equipped with three cold charge devices, two cold charge devices and three cold charge devices loop through screw rod (7) and are connected with water-cooled crystallizer (1), the bottom of water-cooled crystallizer (1) is equipped with dummy bar head (8).
2. The large-size magnesium alloy round billet semi-continuous casting device according to claim 1, which is characterized in that: the water-cooled crystallizer is characterized in that a spiral inner container (9) is arranged inside the water-cooled crystallizer (1), a water inlet (10) and a water outlet (11) are respectively arranged at two ends of the water-cooled crystallizer (1), the water inlet (10) is located at the bottom of one end of the water-cooled crystallizer (1), the water outlet (11) is located at the top of the other end of the water-cooled crystallizer (1), and the water inlet (10) and the water outlet (11) are respectively connected with the inner container (9) in a spiral mode.
3. The large-size magnesium alloy round billet semi-continuous casting device according to claim 2, which is characterized in that: the flow distribution plate (2) comprises a disc (12) and a circular ring (13), the disc (12) is located in the center of the circular ring (13), the disc (12) and the circular ring (13) are connected through a connecting bridge (14), and a plurality of liquid outlet holes (15) are respectively formed in the inner side wall and the outer side wall of the circular ring (13).
4. The large-size magnesium alloy round billet semi-continuous casting device according to claim 3, which is characterized in that: the diameter of the liquid outlet hole (15) is 10-20 mm.
5. The large-size magnesium alloy round billet semi-continuous casting device according to claim 4, which is characterized in that: the protective gas device comprises an annular protective gas ring I (16) and a protective gas ring II (17), wherein the annular protective gas ring I (16) is located 1cm above the splitter plate (2), and the protective gas ring II is located on the edge of the water-cooled crystallizer (1).
6. The large-size magnesium alloy round billet semi-continuous casting device according to claim 5, which is characterized in that: the secondary cooling device comprises an annular secondary cooling water tank (18), water inlets are formed in two ends of the secondary cooling water tank (18) respectively, water outlet holes are formed in the bottom of the secondary cooling water tank (18), and the water outlet holes are inclined by 40 degrees towards the blank direction.
7. The large-size magnesium alloy round billet semi-continuous casting device according to claim 6, which is characterized in that: the three-cooling device comprises an annular three-cooling water tank (19), water inlets are formed in two ends of the three-cooling water tank (19) respectively, water outlet holes are formed in the bottom of the three-cooling water tank, and the water outlet holes incline to 40 degrees towards the blank direction.
8. The large-size magnesium alloy round billet semi-continuous casting device according to claim 7, which is characterized in that: the edge of the dummy bar head (8) is provided with a dovetail groove (20), and the dummy bar head (8) is provided with 4 exhaust holes (21) which are uniformly distributed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122430259.8U CN216176486U (en) | 2021-10-09 | 2021-10-09 | Large-specification magnesium alloy round billet semi-continuous casting device |
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| CN202122430259.8U CN216176486U (en) | 2021-10-09 | 2021-10-09 | Large-specification magnesium alloy round billet semi-continuous casting device |
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