JP2014184487A - Degassing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a degassing device capable of surely preventing entrainment caused by wave rising or eddy of a molten metal surface of a molten metal, and capable of sufficiently removing hydrogen gas or inclusions in the molten metal with a simple structure.SOLUTION: The degassing device comprises: a degassing chamber for storing the molten metal; and an agitation body for agitating the stored molten metal. The degassing chamber comprises: a tank body formed into an approximately rectangular parallelepiped and having an inflow part and an outflow part; and buffle plates provided in a projecting state on side wall faces of the tank body. The buffle plates are provided on the respective side wall faces of the tank body, and among the four buffle plates, at least one of them has projection length different from that of others.

Description

  The disclosed embodiments relate to a degasser.

  Conventionally, when casting an aluminum alloy or the like, a degassing process is performed before removing inclusions such as hydrogen gas and oxide in the molten metal. This is because, for example, a molten metal such as an aluminum alloy is stored in the tank of the degassing chamber, and argon gas or the like is blown into the molten metal while stirring the metal melt while rotating the stirrer. Is to remove. In this way, there is one in which the degassed molten metal is poured out of the bath from the tapping section and discharged into the mold.

  As a degassing apparatus for performing such degassing processing, for example, there is a device provided with a cylindrical or semi-cylindrical baffle member for improving the performance of degassing processing in a tank. (For example, see Patent Document 1).

JP 2010-236784 A

  However, it is difficult to fix the cylindrical baffle member inside the tank body. In addition, in the degassing device, it is desirable to reliably prevent the molten metal surface from undulating or swirling so that impurities floating on the molten metal surface are not mixed with the molten metal again. I can't say that.

  One aspect of the embodiment is a degassing capable of sufficiently removing hydrogen gas and inclusions in the molten metal with a simple configuration by reliably preventing the undulation of the molten metal surface due to undulations and vortices. An object is to provide an apparatus.

  The degassing apparatus which concerns on 1 aspect of embodiment is equipped with the degassing chamber which stores a molten metal, and the stirring body which stirs the stored said molten metal. The degassing chamber includes a substantially rectangular parallelepiped tank body having a hot water inlet and a hot water outlet, and a baffle plate projecting from a side wall surface of the tank main body. Further, one baffle plate is provided on each side wall surface of the tank body, and at least one of the four baffle plates has a different protruding length from the other.

  According to one aspect of the embodiment, the metal surface of the molten metal can be reliably prevented from being swollen or swirled by the vortex, and the removal of hydrogen gas, inclusions, and the like in the molten metal can be sufficiently performed with a simple configuration. Can do.

FIG. 1 is a schematic plan view showing an example of a degassing apparatus according to the first embodiment. FIG. 2 is a partial side view schematically showing a degassing chamber in the degassing apparatus same as above. FIG. 3 is a schematic plan view showing the arrangement of the baffle plates. FIG. 4 is a schematic plan view showing an example of a degassing apparatus according to the second embodiment. FIG. 5 is an explanatory diagram showing a specific configuration of the weir body included in the degassing apparatus same as above. FIG. 6 is a front view showing the weir body. FIG. 7 is a schematic plan view showing a modification of the baffle plate and the weir body. FIG. 8 is a schematic plan view showing a modification of the same baffle plate and weir body. FIG. 9 is a schematic plan view showing a modification of the baffle plate and the weir body. FIG. 10 is a schematic plan view showing a modification of the same baffle plate and weir body. FIG. 11 is a schematic plan view showing a modification of the baffle plate and the weir body.

  Hereinafter, an embodiment of a degassing apparatus disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

(First embodiment)
First, the degassing apparatus which concerns on 1st Embodiment is demonstrated using FIGS. 1-3. FIG. 1 is a schematic plan view showing an example of a degassing apparatus according to the first embodiment. FIG. 2 is a schematic side view partially showing a degassing chamber 1 in the degassing apparatus. 3 is a schematic plan view showing the arrangement of the baffle plates. In the following description, an X axis and a Y axis perpendicular to the installation surface (horizontal plane) of the degassing apparatus are defined, and a Z axis is defined in the normal direction of the installation surface.

  As shown in FIG. 1, the degassing apparatus of this embodiment is a two-tank degassing system in which a first tank body 10 and a second tank body 20 having basically the same configuration are communicated with each other through a communication port 4. Consists of chamber 1. Below, the 1st tank main body 10 and the 2nd tank main body 20 may be named generically, and may only be described as the tank main bodies 10 and 20.

  The tank main bodies 10 and 20 are formed in a substantially rectangular parallelepiped shape with an open top surface, both of which have a substantially square bottom wall 100, and a first side wall 110 and a second side wall 120 erected on the bottom wall 100. , A third side wall 130 and a fourth side wall 140. Hereinafter, the first side wall 110, the second side wall 120, the third side wall 130, and the fourth side wall 140 may be collectively referred to as side walls 110, 120, 130, and 140 in some cases.

  As shown in FIG. 1, the hot water inlet portion 2 is provided near the plus X direction of the first side wall 110 of the first tank body 10, while the minus side of the first side wall 110 of the second tank body 20 is near the minus X direction. The hot water supply part 3 is provided. That is, the hot water inlet portion 2 and the hot water outlet portion 3 are disposed on the same side surface of the degassing chamber 1 as far as possible from each other.

  In addition, the hot water inlet 2 for pouring the molten metal 5 into the first tank body 10 has a hot water passage 22 formed to protrude outward from the first side wall 110 of the first tank body 10. On the other hand, the hot water discharge section 3 for discharging the molten metal 5 from the second tank body 20 to the outside has basically the same structure as the hot water supply section 2, and is outward from the first side wall 110 of the second tank body 20. It has a hot water outlet 33 formed to protrude. In the present embodiment, the molten metal 5 is discharged from the outlet portion 3 into the mold.

  Although omitted in FIG. 1, the tank main bodies 10 and 20 each include a lid 11 as shown in FIG. 2. That is, the tank main bodies 10 and 20 are covered with the lid 11 at the upper surface opening portion. The lid 11 is configured by covering an alumina heat insulating material 115 with a skin material 116 made of iron or the like. Although only the first tank body 10 is shown in FIG. 2, the second tank body 20 also includes a lid 11.

  In the degassing chamber 1, the stirring bodies 6 are disposed in the tank bodies 10 and 20, respectively. The stirrer 6 is, for example, a disc having a wing-shaped convex portion, and is rotatably attached to the distal end of a hollow shaft 61 whose base end is connected to a gas supply device (not shown). Further, the base end of the hollow shaft 61 is connected to the rotation drive device 7 disposed at the approximate center of the lid body 11.

  That is, the stirrer 6 is attached to the hollow shaft 61 at substantially the center of the disc body, and the hollow shaft 61 rotates as a rotating shaft to stir the molten metal 5 such as an aluminum alloy. A blown gas mainly composed of argon gas passes through the hollow shaft 61, and the blown gas is discharged into the molten metal 5 from the tip. The discharged blowing gas is dispersed as fine fine bubbles by the rotation of the stirring member 6. Then, ascending as bubbles, hydrogen gas and impurities in the molten metal 5 are taken in and removed by the lift effect.

  In addition, the blowing gas which concerns on this embodiment uses the mixed gas which mixed argon gas and chlorine gas in the ratio of 95-99: 5-1. By using chlorine gas, in addition to the physical lift effect due to bubbles, it is possible to effectively remove hydrogen gas in the molten metal 5 by chemically reacting. In some cases, 100% argon gas is used without mixing chlorine gas.

  The degassing chamber 1 having such a configuration first stores the molten metal 5 that has been poured from the molten metal portion 2 in the first tank body 10, and is rotated and stirred by the stirring body 6. The blown gas is sent from the stirrer 6 to the primary degassing process. Subsequently, it flows out to the 2nd tank main body 20 from the substantially rectangular communication port 4 formed over the 4th side wall 140 of the said 1st tank main body 10 and the 2nd side wall 120 of the 2nd tank main body 20. .

  Then, while the molten metal 5 is stored in the second tank body 20 and is also stirred by the stirrer 6, the blown gas is fed to perform the secondary degassing process.

  In this embodiment, since the tank main bodies 10 and 20 which comprise the degassing chamber 1 are each formed in the substantially rectangular parallelepiped shape, the residence time of the molten metal 5 can be made substantially uniform. Moreover, since the front-end | tip of the hollow shaft 61 used as a gas discharge port was located in the approximate center of the tank main bodies 10 and 20 of planar view substantially square shape, blowing gas can be disperse | distributed uniformly in the whole tank.

  By the way, it is preferable that the upper limit position of the communication port 4 having a rectangular shape is located between the bottom surface 100 of the tank bodies 10 and 20 and the lower surface of the stirring body 6. The lower limit position of the communication port 4 is preferably substantially the same height as the bottom surface 100 or a height of about 5 to 10 mm from the bottom surface 100. When the height is substantially the same as the bottom surface 100, the inside of the degassing chamber 1 can be easily cleaned. When the height is about 5 to 10 mm from the bottom surface 100, sinked inclusions are not easily mixed into the molten metal 5. It is. In addition, the width dimension of the communication port 4 can be appropriately determined according to the amount of molten metal 5 and the amount of treatment.

  In the configuration described above, the degassing chamber 1 according to the present embodiment includes baffle plates that protrude from the surfaces of the side walls 110, 120, 130, and 140 of the tank bodies 10 and 20, respectively.

  The baffle plate according to this embodiment includes a first baffle plate 41 having a protruding length D1 and a second baffle plate 42 having a protruding length D2. The relationship between the protruding lengths is D1 <D2. For example, if one side of the tank main bodies 10 and 20 has a dimension of approximately 800 to 900 mm, D1 can be set to 60 to 80 mm and D2 can be set to 100 to 150 mm. Moreover, as a thickness dimension, it can be set as 30-60 mm. In the following description, when the first baffle plate 41 and the second baffle plate 42 are collectively referred to without distinction, they may be simply referred to as baffle plates without reference numerals.

  As shown in FIGS. 1 and 3, in the degassing chamber 1 according to the present embodiment, the baffle plate is directed toward the stirring body 6 located at the center of the tank main bodies 10, 20, and the side walls 110, 120, 130, It protrudes at approximately the center of 140. Although only the first tank body 10 is shown in FIG. 3, the arrangement of the baffle plate is the same as that of the first tank body 10 in the second tank body 20.

  Thus, in the degassing chamber 1 according to the present embodiment, the first baffle plates 41, 41 having the first protruding length D1 and the second baffle plates 42, 42 having the second protruding length D2 are used. The two are arranged opposite to each other to form a set.

  By adopting such a configuration, even when the molten metal 5 is stirred by the stirrer 6, the molten metal surface of the molten metal 5 can be maintained in a substantially horizontal plane as indicated by the solid line 51 as shown in FIG.

  If there is no baffle plate, the molten metal surface of the molten metal 5 is drawn in the direction of the center of the vortex as shown by an imaginary line 55 shown in FIG. Thus, when the molten metal surface of the molten metal 5 becomes concave, impurities, hydrogen gas, and the like raised to the vicinity of the molten metal surface due to the folding lift effect may be mixed into the molten metal 5 again. Therefore, it is desirable to keep the hot water surface as horizontal as possible.

  Further, if the first projecting length D1 and the second projecting length D2 of the baffle plate are the same, a small rectangular parallelepiped can be created in a pseudo manner, and eventually a vortex that draws the molten metal surface into a concave shape is generated. . Therefore, it is necessary to deliberately lose balance.

  The degassing apparatus according to the present embodiment includes a set of first baffle plates 41, 41 having a first protruding length D1 and a set of second baffle plates having a second protruding length D2. The hot water surfaces are kept horizontal by arranging 42 and 42 to face each other.

  That is, when the molten metal 5 circulated by the stirring body 6 collides with the first and second baffle plates 41 and 42 to generate turbulent flow, a single large vortex flow is generated by the stirring body 6. Is suppressed.

  However, on the other hand, it is also desired that the molten metal 5 be sufficiently stirred with fine bubbles of the blowing gas. Therefore, a sufficiently large eddy current is generated below the stirring body 6 considered to have a high influence of the rotation of the stirring body 6.

  For this purpose, the lower ends of the first and second baffle plates 41, 42 are positioned above the lower end of the stirring member 6, and the molten metal surface of the molten metal 5 is the first and second baffle plates 41, 42. It is desirable to hold it above the upper end.

  Thus, the generation of a single large eddy current is suppressed by the baffle plate from the height position of the stirring body 6 to the position at a predetermined height above the stirring body 6. That is, the circulated metal melt 5 and the baffle plate collide with each other to generate a turbulent flow, thereby suppressing the formation of a single large vortex.

  Furthermore, since the position of the upper end of the baffle plate is positioned below the molten metal surface, it is possible to prevent a small vortex from being generated due to turbulent flow at the boundary between the baffle plate and the molten metal surface.

  As shown in FIG. 2, the degassing chamber 1 according to this embodiment includes an airtight space 160 between the molten metal surface of the molten metal 5 stored in the tank bodies 10 and 20 and the inner surface of the lid body 11. Is formed. The lid body 11 includes a valve body 12 that is opened with a pressure equal to or higher than a predetermined pressure to communicate the airtight space 160 with the outside air.

  As shown in FIG. 2, the hot water inlet 2 provided at the upper position of the first side wall 110 is slightly lower than the portion where the hot water inlet 22 extends downward and projects outward. The first side wall 110 of the first tank body 10 is opened at a position. The opening 23 is flush with the inner side surface of the first side wall 110.

  As shown in the drawing, the molten metal 5 is filled up to the hot water passage 22 so that at least the molten metal surface does not fall below the opening 23. As a result, the airtight space 160 of the first tank body 10 is blocked from the outside air even if the hot water portion 2 is interposed. This is an air lock structure, and the molten metal 5 filled in the first tank body 10 is prevented from coming into contact with air.

  The structure of the “air lock” was described using only the first tank body 10 shown in FIG. 2, and the description of the second tank body 20 was omitted. However, also in the 2nd tank main body 20, it has the structure of the same air lock fundamentally only by changing the hot water input part 2 into the hot water discharge part 3. FIG.

  By the way, as shown in FIG. 1, a cleaning port 150 is formed in the upper center of each third side wall 130 of the tank main bodies 10 and 20. That is, the inside of the cleaning port 150 is appropriately recessed so as to be continuous with the inside of the tank bodies 10 and 20, and inclusions floating in the recessed portions can be collected and removed.

  By the way, in embodiment mentioned above, the 1st baffle plates 41 and 41 of 1st protrusion length D1 and 2nd baffle plates 42 and 42 of 2nd protrusion length D2 each oppose. Arranged configuration.

  However, the configuration and arrangement of the baffle plate are not limited to the above-described form. That is, one baffle plate is provided on each of the side walls 110, 120, 130, and 140 of the tank bodies 10 and 20, and at least one of the four baffle plates has a protruding length different from the others. Any gas chamber 1 may be used.

(Second Embodiment)
In the above-described embodiment, the two-tank type degassing apparatus has been described. However, the degassing apparatus may be a single-tank type. FIG. 4 is a schematic plan view showing an example of a degassing apparatus according to the second embodiment. FIG. 5 is an explanatory view showing a specific configuration of the weir body 8 included in the degassing apparatus, and FIG. 6 is a front view showing the weir body 8 of the same. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the degassing apparatus according to the present embodiment includes a single tank type degassing chamber 1 including a single tank body 30. Similar to the tank bodies 10 and 20 in the previous embodiment, the tank body 30 has a substantially square bottom wall 300 and a first side wall 310, a second side wall 320, and a third side wall that are erected on the bottom wall 300. 330 and a fourth side wall 340 are formed in a substantially rectangular parallelepiped shape with an open top surface. Hereinafter, the first side wall 310, the second side wall 320, the third side wall 330, and the fourth side wall 340 may be collectively referred to as side walls 310, 320, 330, and 340 in some cases.

  As shown in FIG. 4, the degassing apparatus is provided with a hot water inlet 2 at an upper position near the minus Y direction of the first side wall 310 in the tank body 30. On the other hand, the hot water discharge part 3 is provided at the lower position near the plus Y direction of the third side wall 330 (see FIGS. 5 and 6). That is, the hot water inlet portion 2 and the hot water outlet portion 3 are provided so as to be positioned diagonally in the tank body 30 and are separated as much as possible. Therefore, the stirring time of the molten metal 5 can be lengthened, and degassing can be sufficiently performed.

  Further, in the tank body 30 according to the present embodiment, the protruding lengths of the baffle plates protruding from the surfaces of the side walls 310, 320, 330, and 340 are different. That is, the baffle plate according to the present embodiment includes third to sixth baffle plates 43 to 46 having different projecting lengths.

  That is, the baffle plate includes a third baffle plate 43 having a protruding length D11, a fourth baffle plate 44 having a protruding length D12, a fifth baffle plate 45 having a protruding length D13, and a protruding length D14. And a sixth baffle plate 46. Here, the relationship of the protrusion length is D11> D12> D13> D14, but it is of course not limited to this.

  In addition, the degassing apparatus according to the present embodiment includes a weir body 8 that receives the flow of the molten metal 5 on the upstream side of the molten metal 5 that circulates in the tank body 30 in the hot water discharge unit 3. That is, the weir body 8 having a substantially triangular shape when viewed from above is provided on the third side wall 330 provided with the tapping part 3 so as to protrude inward from the side of the opening 31 of the tapping part 3. Moreover, the upper end surface 81 of the weir body 8 is an inclined surface that is inclined with respect to the bottom surface 300 of the tank body 30.

  The weir body 8 is for preventing the molten metal 5 from flowing out from the hot water outlet 3 without flowing sufficiently. Therefore, as shown in FIGS. 5 and 6, the upstream side of the circulating metal melt 5 is closed and the downstream side is opened. That is, as shown in FIGS. 4 and 5, when the stirring member 6 rotates in the direction of arrow A, the flow of the molten metal 5 between the hollow shaft 61 of the stirring member 6 and the third side wall 330 is As shown by an arrow B in FIG. 4, the second side wall 320 is directed to the fourth side wall 340. Therefore, the weir body 8 is provided so that the 4th side wall 340 side may open | release.

  At this time, as shown in FIG. 5 and FIG. 6, the upper end surface 81 of the weir body 8 has a downward slope toward the downstream side of the molten metal 5, that is, a downward slope toward the opening 31 of the tapping part 3. That is, the weir body 8 can also guide the circulating metal melt 5 to the outlet portion 3 side, and does not become an obstacle that completely prevents the circulating metal melt 5 from flowing. Thus, by providing the weir body 8, the molten metal 5 can be allowed to flow out of the hot water outlet 3 over a certain period of time while circulating the molten metal 5.

  In addition, the dimension of the height direction of the weir body 8 which concerns on this embodiment makes the dimension of the wall side about 10-20 mm larger than the dimension of the height direction of the opening 31 of the tap water part 3, for example, and height of a front-end | tip part. The size is made substantially equal to the height of the opening 31 of the hot water supply part 3.

  The surface of the weir body 8 that receives the flow of the molten metal is an inclined surface. The inclination angle is preferably 20 ° to 70 ° with respect to the third side wall 330, and more preferably the third side wall 330. The angle is 25 ° to 65 °. Particularly preferably, the angle is 30 ° to 60 ° with respect to the third side wall 330, and here, the angle is 45 °.

  Although omitted in FIGS. 4 to 6, the tank body 30 is covered with the lid 11 and used even in a single tank type degassing apparatus.

  Here, a modified example of the baffle plate and the weir body will be described with reference to FIGS. 7 to 11 are schematic plan views illustrating modifications of the baffle plate and the weir body.

  The baffle plate shown in FIGS. 1 to 6 protrudes at a right angle to the side wall surface, but as shown in FIG. 7, the baffle plate has a predetermined inclination angle with respect to the side wall surface. You can also. That is, the baffle plate 47 according to the first modification is provided to protrude at a predetermined inclination angle with respect to the wall surfaces of the side walls 310, 320, 330, and 340. The inclination angle is, for example, an acute angle with respect to the rotation direction (arrow A) of the stirring body 6 and can be in the range of 45 degrees to 75 degrees. Here, the inclination angle is approximately 65 degrees.

  Even in such a configuration, a single large vortex flow is generated by the stirring member 6 by causing the circulating metal melt 5 to collide with the four baffle plates 47 according to the first modification to generate turbulent flow. This can be suppressed and the surface of the hot water can be kept horizontal.

  Further, the weir body 800 according to the first modification shown in FIG. 7 is formed in a rectangular plate shape, whereas the weir body 8 shown in FIGS. The side wall 330 is disposed obliquely. Also in this case, the upper end surface of the weir body 800 is an inclined surface that is inclined with respect to the bottom surface 300 of the tank body 30. Even with such a configuration, the molten metal 5 can be allowed to flow out of the hot water outlet 3 over a certain period of time while circulating the molten metal 5.

  In addition, although the height of the weir body 800 which concerns on a 1st modification is not specifically limited, it makes it higher than the height of the opening 31 of the tap water part 3. FIG. Specifically, the weir body 800 is preferably installed so as to be about 10 to 20 mm higher than the upper edge of the opening 31.

  If the weir body 800 is installed lower than the height of the opening 31 of the hot water outlet 3, the outflow of bubbles increases, which causes a decrease in the degassing value.

  The baffle plate 48 according to the second modification shown in FIG. 8 is inclined in the opposite direction to the example shown in FIG. That is, the baffle plate 48 according to the second modified example is provided so as to project at an inclination angle of 105 degrees to 135 degrees with respect to the respective wall surfaces of the side walls 310, 320, 330, and 340. The inclination angle in this case is an obtuse angle with respect to the rotation direction (arrow A) of the stirrer 6.

  Even in such a configuration, a single large vortex flow is generated by the stirrer 6 by causing the circulating metal melt 5 to collide with the four baffle plates 48 according to the second modification to generate turbulent flow. This can be suppressed and the surface of the hot water can be kept horizontal.

  Further, the weir body 810 according to the second modification shown in FIG. 8 has a rectangular shape, and is disposed obliquely with respect to the third side wall 330, as is the weir body 800 according to the first modification. However, the surface that receives the circulating molten metal 5 is curved. Here, the surface on the opening 31 side of the tapping part 3 is concave and the side of the stirring member 6 is convex, but it may be curved conversely. Also in this case, the upper end surface of the weir body 810 is an inclined surface that is inclined with respect to the bottom surface 300 of the tank body 30. Even with such a configuration, the molten metal 5 can be allowed to flow out of the hot water outlet 3 over a certain period of time while circulating the molten metal 5.

  By the way, in the example shown in FIGS. 4-8, the baffle plate was provided in the approximate center of each side wall 310,320,330,340, respectively. However, the four baffle plates 49 according to the third modification shown in FIG. 9 have different attachment positions with respect to the side walls 310, 320, 330, and 340, respectively.

  Moreover, the weir body 820 according to the third modification shown in FIG. 9 is formed in a substantially L shape in a top view. The weir body 820 according to the third modification is formed so as to protrude upward from the bottom surface 300 of the tank body 30 so as to surround the opening 31 of the tapping part 3. The weir body 820 according to the third modified example is also for preventing the molten metal 5 from flowing into the tapping part 3 without circulating.

  That is, the weir body 820 closes the upper side of the flow of the circulating molten metal 5 with the first standing wall 821 and the tip side of the second standing wall 822 extending from the first standing wall 821 to the fourth side wall 340 side at a right angle. Provided to open.

  In this case, the upper end surface 823 of the second standing wall 822 is an inclined surface that is inclined with respect to the bottom surface 300 of the tank body 30, and the upper end surface 823 that forms the inclined surface is downstream of the molten metal 5 as shown in FIG. 10. It has a downward slope toward

  The weir body 820 is installed such that its height is higher than the height of the opening 31. Specifically, the first standing wall 821 is made higher by about 10 to 50 mm than the upper edge of the opening 31, and the tip of the upper end surface 823 serving as an inclined surface is substantially coincident with the upper edge of the opening 31. Even with this configuration, it is possible to prevent the molten metal 5 having a short residence time from flowing out of the hot water outlet 3.

  Further, as shown in FIG. 11, the inclined surface of the weir body 820 can be configured to have an upward gradient toward the downstream side of the molten metal 5. That is, the second standing wall 822 of the weir body 820 is configured to have an upper end surface 824 having an upward slope toward the downstream side of the molten metal 5.

  In this case, the height of the weir body 820 is such that the first standing wall 821 substantially coincides with the upper edge of the opening 31, and the tip of the upper end surface 824 that is an inclined surface is about 10 to 50 mm from the upper edge of the opening 31. Make it high. Even with this configuration, it is possible to prevent the molten metal 5 having a short residence time from flowing out of the hot water outlet 3.

  As described above, in the embodiment described above, a degassing apparatus having the following configuration is provided.

  In other words, the degassing chamber 1 for storing the molten metal 5 and the stirring body 6 for stirring the stored molten metal 5 are provided. The degassing chamber 1 has a substantially rectangular parallelepiped shape having the hot water inlet portion 2 and the hot water outlet portion 3. A degassing apparatus comprising tank bodies 10, 20, 30 and baffle plates that protrude from the side walls 110-140 (310-340) of the tank bodies 10, 20, 30.

  One baffle plate is provided on each of the side walls 110 to 140 (310 to 340) of the tank bodies 10, 20, and 30, and at least one of the four baffle plates has a different protruding length from the other. Degassing device.

  A degassing apparatus in which baffle plates 41, 41 having a first protruding length D1 and baffle plates 42, 42 having a second protruding length D2 are arranged to face each other.

  The baffle plate is a degassing device having a predetermined inclination angle with respect to the side wall surfaces 110 to 140 (310 to 340).

  A degassing device in which the lower end of the baffle plate is positioned above the lower end of the stirring member 6 and the molten metal surface of the molten metal 5 is held above the upper end of the baffle plate.

  A lid 11 is provided to cover the upper surface opening of the tank bodies 10, 20, 30, and an airtight space 160 is provided between the molten metal 5 stored in the tank bodies 10, 20, 30 and the inner surface of the lid 11. Degassing device.

  The lid body 11 is a degassing device including a valve body 12 that is opened at a pressure equal to or higher than a predetermined pressure to communicate the airtight space 160 with the outside air.

  A dam body 8, 800, 810, 820 that receives the flow of the molten metal 5 is provided on the upstream side of the molten metal 5 that circulates in the tank body 30 in the tapping section 3, and the dam bodies 8, 800, 810, 820 are provided. The upper end surfaces 81, 823, and 824 are degassing devices that are inclined surfaces that are inclined with respect to the bottom surface 300 of the tank body 30.

  The inclined surface of the weir bodies 8, 800, 810, and 820 is a degassing device having a downward slope toward the downstream side of the molten metal 5.

  The inclined surface of the weir bodies 8, 800, 810, and 820 is a degassing device having an upward slope toward the downstream side of the molten metal 5.

  According to the degassing apparatus having the above-described configuration, the molten metal 5 is poured into the degassing chamber 1 from the hot water inlet 2 and stored, and the molten metal is rotated and stirred by the stirring body 6, and the blowing gas is discharged to degas. To do.

  Under the present circumstances, the hot_water | molten_metal surface of the molten metal 5 can be maintained on a substantially horizontal surface with the baffle plate each protrudingly provided by the side wall 110-140 (310-340) surface of the tank main bodies 10,20,30. As a result, it is possible to prevent as much as possible the possibility that impurities, hydrogen gas, and the like raised to the vicinity of the molten metal surface due to the lift effect are mixed into the molten metal 5 again.

  Further, for example, in the single tank type degassing apparatus, since the weir body 8 is provided in the vicinity of the opening 31 communicating with the tapping part 3, the molten metal 5 does not flow out without being sufficiently stirred, so that the molten metal can be removed. The gas can be sufficiently performed.

  In the present embodiment, the degassing chamber 1 has been described as a single tank type or a two tank type, but it may be a multi-tank type of three or more tanks.

  Moreover, as a degassing apparatus, the structure shown in 1st Embodiment, the structure shown in 2nd Embodiment, and the structure which concerns on each modification of a baffle plate and the weir body 8 are comprised suitably combining arbitrarily. You can also

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1 Degassing chamber (stirring body for molten metal)
2 Hot-water unit 3 Hot-water unit 5 Molten metal 6 Stirrer 8 Weir body 10, 20, 30 Tank body 11 Lid body 12 Valve body 41, 42 Baffle plate 81 Upper side surface 110, 120, 130, 140 Side wall 160 Airtight space 300 Bottom surface 310 , 320, 330, 340 Side wall 800, 810, 820 Weir body 823, 824 Upper side surface

Claims (10)

A degassing chamber for storing the molten metal, and a stirring body for stirring the stored molten metal,
The degassing chamber is
A substantially rectangular parallelepiped tank body having a hot water portion and a hot water portion,
A degassing apparatus comprising baffle plates protruding from the side wall surfaces of the tank body.   2. The baffle plate according to claim 1, wherein one baffle plate is provided on each side wall surface of the tank body, and at least one of the four baffle plates has a protruding length different from the other. Degassing device.   3. The degassing apparatus according to claim 1, wherein the baffle plates having the first projecting length and the baffle plates having the second projecting length are arranged to face each other.   The degassing apparatus according to any one of claims 1 to 3, wherein the baffle plate has a predetermined inclination angle with respect to the side wall surface.   The lower end of the baffle plate is located above the lower end of the stirrer, and the molten metal surface is held above the upper end of the baffle plate. The degassing apparatus as described in any one. A lid that covers the open top of the tank body;
The degassing apparatus according to any one of claims 1 to 5, further comprising an airtight space between a molten metal surface of the molten metal stored in the tank body and the inner surface of the lid.   The degassing apparatus according to claim 6, wherein the lid body includes a valve body that is opened at a pressure equal to or higher than a predetermined level to communicate the airtight space with the outside air. On the upstream side of the molten metal that circulates in the tank body in the tapping part, a weir body that receives the flow of the molten metal,
The degassing apparatus according to any one of claims 1 to 7, wherein the upper end surface of the weir body is an inclined surface inclined with respect to the bottom surface of the tank body.   The degassing apparatus according to claim 8, wherein the inclined surface of the weir body has a downward slope toward the downstream side of the molten metal.   The degassing apparatus according to claim 8, wherein the inclined surface of the weir body has an upward slope toward the downstream side of the molten metal.

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