JP2016135503A - Nozzle structure, molding machine and molding manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle structure of a circular ladle which can achieve stabilized pouring.SOLUTION: In a first cross-section surface, the minimum distance (ds) between a nozzle (10) and a center (3c) is not less than a radius (rc1) of a first circle (c1).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a nozzle structure for pouring molten metal from the inner surface of the ladle body to the outside of the ladle body, a casting machine equipped with the nozzle structure, and a method for producing a casting using the casting machine.

  An example of a nozzle structure for pouring molten metal from the lower surface of the ladle body to the outside of the ladle body is disclosed in Patent Document 1, for example.

Japanese Patent Laid-Open No. 61-3656 (published January 9, 1986)

  By the way, the ladle main body which has the inner surface whose cross-sectional shape of a perpendicular direction is a 1st circular arc, and is rotated centering on the center of the 1st circle | round | yen which comprises a 1st circular arc is provided in this ladle main body. Development of a ladle (hereinafter referred to as an arc ladle) having a nozzle structure for pouring molten metal from the inner surface of the ladle body to the outside of the ladle body has been studied.

  The molten metal stored in the ladle body can be mixed with dirt. The dirt is oxide or sulfide of the molten metal and is light enough to float on the molten metal. According to the arc ladle, by pouring while maintaining the nozzle structure sufficiently below the liquid level of the molten metal, it is possible to prevent the dirt from flowing out together with the molten metal.

  In addition, according to the arc ladle, by rotating the ladle body and making the liquid surface height of the melt relative to the nozzle structure constant during pouring, the pressure applied to the nozzle structure is kept constant, Thereby, the momentum at which the molten metal is poured from the nozzle structure can be kept constant. For this reason, it is easy to quantify the amount of molten metal poured to some extent strictly.

  On the other hand, the nozzle structure disclosed in Patent Document 1 relates to a ladle that pours molten metal from the bottom surface, and is not assumed to be applied to the arc ladle. It does not have a suitable shape. When the nozzle structure disclosed in Patent Document 1 is applied to an arc ladle, there is a problem that the metal structure tends to adhere to the nozzle structure and its periphery, and the pouring becomes unstable.

  The present invention has been made in view of the above problems, and an object thereof is a nozzle structure of an arc ladle, a nozzle structure capable of stabilizing pouring, and a casting provided with this nozzle structure. And a method for producing a casting using the casting machine.

  In order to solve the above problems, the nozzle structure of the present invention has an inner surface whose vertical cross-sectional shape is a first arc, and is rotated around the center of the first circle constituting the first arc. A nozzle structure for pouring molten metal from the inner surface of the ladle body to the outside of the ladle body, and in the vertical cross section, the nozzle structure and the first The shortest distance from the center of one circle is not less than the radius of the first circle.

  According to said structure, it can prevent that a metal | base metal adheres to a nozzle structure and its periphery by providing a nozzle structure so that it may not protrude to the center side of a 1st circle | round | yen with respect to a 1st circular arc. As a result, the pouring can be stabilized.

  Further, the nozzle structure of the present invention is a cylindrical portion having a linear inner wall extending in the pouring direction of the molten metal, the nozzle structure being arranged on the outer side of the ladle body in the vertical cross section. And a curved surface portion that is disposed on the inner surface side of the ladle body with respect to the cylindrical portion, and has an inner wall in which an opening diameter of the nozzle structure increases from the cylindrical portion toward the inner surface of the ladle body. It is preferable.

  According to said structure, the vertical cross-sectional shape is provided with the cylindrical part which has a linear inner wall, and can suppress the dispersion | variation in the flow rate of the molten metal poured.

  Further, in the nozzle structure of the present invention, in the cross section in the vertical direction, the inner wall of the curved surface portion is composed of a second arc different from the first arc, and the radius of the second circle constituting the second arc is It is preferable that it is not less than the opening diameter of the cylindrical portion and not more than the opening diameter of the end portion on the inner surface side of the ladle body in the nozzle structure.

  According to said structure, it can suppress that a base metal adheres to a nozzle structure and its periphery, and can stabilize a pouring even if a base metal adheres.

  In the nozzle structure of the present invention, in the vertical section, the length of the inner wall of the curved portion is preferably 1/6 or more and 1/4 or less of the circumference of the second circle.

  According to said structure, it can suppress that a base metal adheres to a nozzle structure and its periphery, and can stabilize a pouring even if a base metal adheres.

  In the nozzle structure of the present invention, in the vertical section, the length of the cylindrical portion along the pouring direction of the molten metal is preferably three times or more the opening diameter of the cylindrical portion.

  According to said structure, by making a cylindrical part sufficiently long, the flow of the molten metal prescribed | regulated by the Reynolds number can be stabilized.

  Moreover, it is preferable that the nozzle structure of this invention has the part protruded with respect to the outer surface of the said ladle main body.

  According to said structure, since heat can be discharged | emitted effectively from a nozzle structure, a nozzle structure can be enlarged.

  Moreover, the casting machine of this invention is equipped with said nozzle structure, It is characterized by the above-mentioned.

  According to said structure, in a casting machine, the effect similar to said nozzle structure can be acquired.

  Moreover, the manufacturing method of the casting of this invention is a manufacturing method of the casting using said casting machine, Comprising: The molten metal poured through the said nozzle structure is supplied to the cylindrical mold of the said casting machine. A molten metal supply step, and in the molten metal supply step, the molten metal supply portion to the mold is moved in the direction of the nozzle structure while rotating the mold around the cylindrical axis of the mold. It is characterized by.

  According to said structure, the casting by which quality degradation was suppressed can be manufactured by using the casting machine of this invention.

  The present invention is a nozzle structure of an arc ladle and can stabilize pouring.

It is sectional drawing which shows the arc ladle provided with the ladle main body and nozzle structure which concern on this invention. It is sectional drawing which shows the nozzle structure concerning this invention concretely. It is the table | surface which showed the relationship between the shape of the nozzle structure which concerns on this invention, and the stability of pouring. It is sectional drawing which shows the structure of the casting machine which concerns on this invention. FIG. 5 is an enlarged view of a ladle and a chute, which is a molten metal supply structure in the casting machine shown in FIG. 4. It is sectional drawing which shows the structure of another casting machine which concerns on this invention, and has shown the mode at the time of a casting start. It is sectional drawing which shows the structure of another casting machine which concerns on this invention, and has shown the mode at the time of completion | finish of casting. It is a figure which shows an example of the refractory construction method of a ladle.

(Nozzle structure)
The form of the nozzle structure will be described below. FIG. 1 is a sectional view showing an arc ladle having a ladle body and a nozzle structure. The arc ladle 3 shown in FIG. 1 includes a ladle body 9 and a nozzle (nozzle structure) 10.

  The ladle main body 9 stores the molten metal 2 and includes a bottom surface portion 9b. The bottom surface portion 9b has an inner surface whose vertical cross section (hereinafter referred to as a first cross section) is a first arc. Further, the ladle body 9 is rotated within the first cross section about the center 3c of the first circle c1 constituting the first arc. In other words, the first cross-sectional view of the ladle body 9 has a fan shape centered on the center 3c.

  The nozzle 10 is disposed on the bottom surface portion 9b. The nozzle 10 is provided for pouring the molten metal 2 from the inner surface of the ladle body 9 to the outside of the ladle body 9. Since the nozzle 10 also rotates following the rotation of the ladle body 9, the amount of the molten metal 2 poured from the ladle body 9 to the outside is adjusted by controlling the rotation angle of the ladle body 9. Is possible.

  Here, in the first cross section, the shortest distance ds between the nozzle 10 and the center 3c is not less than the radius rc1 of the first circle c1. By providing the nozzle 10 so as not to protrude toward the center 3c with respect to the first arc, it is possible to prevent the metal from being attached to the nozzle 10 and its periphery. As a result, the pouring can be stabilized.

  FIG. 2 is a sectional view specifically showing the nozzle structure. FIG. 2 shows the shape of the first cross section of the nozzle 10.

  In the first cross section, the nozzle 10 includes a cylindrical portion 10y, a curved surface portion 10n, and a linearly expanded portion in order from the outside of the ladle body 9. The cylindrical portion 10 y has a linear inner wall extending in the pouring direction of the molten metal 2. On the other hand, the curved surface portion 10n is disposed on the inner surface side of the ladle body 9 with respect to the cylindrical portion 10y, and has an inner wall in which the opening diameter of the nozzle 10 increases from the cylindrical portion 10y toward the inner surface of the ladle body 9. ing. More specifically, the curved surface portion 10n of the nozzle 10 shown in FIG. 2 has a trumpet shape. By providing the cylindrical part 10y with the first cross-sectional shape having a straight inner wall, variation in the flow rate of the molten metal 2 to be poured can be suppressed.

  In the first cross section, the inner wall of the curved surface portion 10n is formed of a second arc (different from the first arc). And the radius R of the 2nd circle | round | yen c2 which comprises this 2nd circular arc is more than opening diameter (phi) 1 of the cylindrical part 10y, and is less than opening diameter (phi) 2 of the edge part by the side of the inner surface of the ladle main body 9 in the nozzle 10. FIG. In the first cross section, the length Ln of the inner wall of the curved surface portion 10n is not less than 1/6 and not more than 1/4 of the circumference of the second circle c2. In other words, the length Ln is constituted by the curved surface portion 10n. The fan-shaped angle θ1 is 60 ° or more and 90 ° or less. By these, it can suppress that a metal bar adheres to the nozzle 10 and its periphery, and even if a metal bar adheres, pouring can be stabilized.

  Here, the end portion on the inner surface side of the nozzle 10 shown in FIG. 2 is a portion that is linearly expanded in diameter, but the curved surface portion 10n is a shape that forms the end portion on the inner surface side of the nozzle 10, that is, The shape may be such that there is no linearly expanded portion.

  In the first cross section, the length L1 along the pouring direction of the molten metal 2 of the cylindrical portion 10y is preferably at least three times the opening diameter φ1 of the cylindrical portion 10y. By making the cylindrical portion 10y sufficiently long, the flow of the molten metal 2 to be poured, which is defined by the Reynolds number, can be stabilized.

  Moreover, the nozzle 10 has a portion that protrudes from the outer surface of the ladle body 9. Thereby, since heat can be effectively discharged from the nozzle 10, the nozzle 10 can be enlarged.

  In the first cross section, the nozzle 10 is interpreted such that the arrangement of the end portion on the inner surface side of the ladle main body 9 in the nozzle 10 is composed of either the first arc or the outer side of the first circle c1. You can also. Further, the nozzle 10 can be interpreted as having a configuration in which the distance (distance ds) between the nozzle 10 and the center 3c is not less than the radius rc1 in the first cross section.

  The opening diameter of the cylindrical portion 10y shown in FIG. 2 is constant (opening diameter φ1) regardless of the position in the cylindrical portion 10y. On the other hand, the opening diameter of the cylindrical portion 10 y may be a shape that narrows toward the outside of the ladle body 9. With this shape, it is considered possible to further stabilize the pouring.

  Moreover, although the nozzle 10 is provided as a separate body from the ladle body 9 in FIG. 1, the nozzle 10 may be formed by processing the bottom surface portion 9 b of the ladle body 9.

[Consideration of relationship between shape of nozzle structure and stability of pouring]
FIG. 3 is a table showing the relationship between the shape of the nozzle structure and the stability of the pouring. In FIG. 3, four types of nozzles 10 a, 10 c, 10 d, and 10 e were prepared, and data related to the stability of pouring was obtained for each of them. Moreover, in FIG. 3, length L1 is made into length L2 with respect to the nozzle 10a (from the edge part of the inner surface side of the ladle main body 9 in the cylindrical part 10y to the edge part of the inner surface side of the ladle main body 9 in the nozzle 10). The same data as the nozzles 10a, 10c, 10d, and 10e were measured for a nozzle (for convenience, referred to as the nozzle 10b) that was equal to or less than the length of the molten metal 2 along the pouring direction.

  In addition, the measurement method uses the molten iron of 1350 ° C. as the molten metal 2, pours 50 kg of molten metal 2 into the arc ladle 3, and then discharges from each nozzle at about 5 kg / second from the arc ladle 3 for the first time. The rotational speed at the time of pouring was specified, and 125 times of pouring were repeated under the same rotational speed conditions. In addition, in the item “Amount of adhesion of metal after 125 times of pouring g” in FIG. 3, the amount of metal that adhered to a portion having a radius of 100 mm from the center of each nozzle was examined. In addition, the items “flow rate change% for the first time and 125th time” and “flow rate variation%” in FIG. 3 were obtained by examining the molten metal 2 poured from each nozzle.

  The nozzles 10a and 10b, the nozzles 10c and 10d, and the nozzle 10e are compared. The nozzles 10a and 10b have a distance ds greater than or equal to the radius rc1. On the other hand, the nozzles 10c to 10e have a distance ds less than the radius rc1, in other words, are configured to protrude toward the center 3c with respect to the first arc. The nozzle 10e has a larger amount of protrusion (the distance ds is shorter) than the nozzles 10c and 10d.

  The adhesion amount of the metal after 125 times of pouring is less than 160 g at the nozzles 10a and 10b, exceeds 250 g at the nozzles 10c and 10d, and increases to 430g at the nozzle 10e. Moreover, the flow rate change of the 1st time and the 125th time is 3% or less in the nozzles 10a and 10b, whereas it is 5% or more in the nozzles 10c to 10e. From the above, it can be confirmed that by setting the distance ds to the radius rc1 or more, it is possible to prevent the metal structure from adhering to the nozzle structure and the periphery thereof, and as a result, the pouring can be stabilized. It was.

  The nozzle 10a and the nozzle 10b are compared. The nozzle 10a has a length L1 that is at least three times the opening diameter φ1. On the other hand, the length of the nozzle 10b is less than three times the opening diameter φ1.

  The variation in flow rate is 7.5% in the nozzle 10a, and 10.5% in the nozzle 10b. From the above, by providing the cylindrical portion 10y, it is possible to suppress variations in the flow rate of the molten metal 2 to be poured, and by making the cylindrical portion 10y sufficiently long, the flow of the molten metal 2 to be poured. It was confirmed that can be stabilized.

  The nozzle 10c, the nozzle 10d, and the nozzle 10e are compared. The nozzles 10d and 10e have a radius R not less than the opening diameter φ1 and not more than the opening diameter φ2. On the other hand, the nozzle 10c has a radius R less than the opening diameter φ1. Further, the radius R of the nozzle 10e is larger than the radius R of the nozzle 10d.

  The adhesion amount of the metal after 125 times of pouring is 284 g in the nozzle 10c, while it is 253 g in the nozzle 10d. From the above, it has been confirmed that by setting the radius R to be larger than the opening diameter φ1 (and smaller than the opening diameter φ2), it is possible to suppress the adhesion of the base metal to the nozzle structure and its periphery. In addition, the cause of the large amount of metal adhesion at the nozzle 10e (the amount of metal adhesion after 125 times pouring: 430 g) is not due to the radius R, but as described above, the amount of protrusion relative to the first arc is large ( This is because the distance ds is short.

  The first and 125th changes in flow velocity are the smallest for the nozzle 10e and increase in the order of the nozzle 10d and the nozzle 10c. From the above, it was confirmed that the pouring can be stabilized even if the metal is attached by setting the radius R to be equal to or larger than the opening diameter φ1.

[Casting machine 1]
FIG. 4 is a cross-sectional view showing the configuration of the casting machine. Specifically, FIG. 4 shows a state at the end of casting.

  A casting machine 100 shown in FIG. 4 includes an arc ladle 3 to which the molten metal 2 is supplied from the stationary ladle 1, a motor 4, a chute 5, a trough 6, a casting part 7, and a trough moving part 8. The arc ladle 3 includes a ladle body 9 and a nozzle 10.

  The ladle body 9 is rotated by the motor 4. The bottom surface portion 9b is provided so as to extend along the center 3c (rotation axis) (in the front and back direction of the paper).

  The chute 5 is a groove-shaped member that receives the molten metal 2 poured from the arc ladle 3 and guides the received molten metal 2 in the horizontal direction. The chute 5 has a coating mold (graphite or the like) applied to its surface. The molten metal 2 guided by the chute 5 is supplied to the trough 6.

  In the first cross section, the chute 5 has an angle θ (see FIG. 5) formed by a pouring direction from the ladle body 9 to the outside and a direction in which the chute 5 guides the molten metal 2 is 90 ° or more and 270 ° or less. is there. Preferably, it is 180 degrees or less. Here, the direction in which the chute 5 guides the molten metal 2 is the flow direction of the molten metal 2 at the tip of the chute 5 (the direction in which the molten metal 2 is guided to the trough 6), and the angle θ is the main body of the ladle as shown in FIG. This is an angle at which the flow direction changes from the direction of pouring from 9 to the outside and the direction in which the tip of the chute 5 leads the molten metal 2 to the trough 6. In other words, the direction in which the molten metal 2 flows at the tip of the chute 5 is substantially opposite to the direction of pouring from the nozzle 10 and the horizontal direction. Thereby, since the flow of the molten metal 2 poured from the arc ladle 3 can greatly change the flow direction by the chute 5, it is possible to buffer the momentum during pouring from the arc ladle 3. For this reason, the flow of the molten metal 2 supplied from the chute 5 can be stabilized. The chute 5 is a second arc in which the first cross-sectional shape is centered on the center 3c and the distance from the first arc to the center 3c is far. Thereby, it is easy to make the shortest distance d (refer FIG. 5) of the bottom face part 9b and the chute | shoot 5 constant. By making the shortest distance d constant, it is possible to further stabilize the chute 5 from guiding the molten metal 2.

  The trough 6 is a groove through which the molten metal 2 passes, extends slightly inclined so that the casting part 7 side is lowered, and is placed on the carriage 6b. The trough moving unit 8 is, for example, a rail, and moves the carriage 6b along the extending direction of the trough 6. The trough 6 usually has an inclination angle parallel to the rail, but it may be possible to further incline the casting part 7 side relative to the rail.

  The casting unit 7 includes a mold 11, a sleeve 12, a mold rotation mechanism 13, and a vibration damping table 14. The mold 11 and the sleeve 12 are cylindrical. The sleeve 12 is provided concentrically with the mold 11 so as to surround the mold 11. Further, a space 15 is formed between the mold 11 and the sleeve 12, and the mold 11 can be cooled by supplying a cooling fluid (water or the like) to the space 15. The molten metal 2 guided to the trough 6 flows down from the end of the trough 6 on the casting part 7 side (hereinafter referred to as the end of the trough 6) and is guided to the mold 11. That is, the end of the trough 6 is a supply part of the molten metal 2 to the mold 11.

  The mold rotation mechanism 13 rotates the mold 11 and the sleeve 12 about the cylindrical axis of the mold 11 as a rotation axis. As a rotation method by the mold rotation mechanism 13, both ends of the sleeve 12 are supported by support rollers, and a roller mounted on the vibration damping table 14 is brought into contact with the lower side of the sleeve 12 to be mounted on the vibration damping table 14. For example, a method of rotating a roller by a motor can be used.

  The damping table 14 suppresses vibration of the mold 11 when the mold 11 and the sleeve 12 are rotated. Further, as described above, the vibration damping table 14 is provided with a roller, and this roller rotates the mold 11 and the sleeve 12 (part of the function of the mold rotation mechanism 13).

  In the casting machine 100, the position of the nozzle 10 can be changed by rotating the ladle body 9. Thereby, the position where the chute 5 receives the molten metal 2 can be appropriately changed according to the rotation angle of the ladle body 9. As a result, even if the coating mold applied to the molten metal contact surface on the surface of the chute 5 is not thickly applied, it is possible to suppress the occurrence of seizure on the surface of the chute 5 and to reduce damage to the chute 5.

  Further, the width of the bottom surface portion 9b in the direction along the rotation axis is less than the diameter of the circle having the first arc. In other words, the width of the bottom surface portion 9 b is less than the maximum value of the width of the side surface portion that is a sector shape of the ladle body 9. Thereby, since it becomes possible to make small the change of the pouring amount accompanying rotation of the arc ladle 3 by making the width | variety of the ladle main body 9 in the direction perpendicular | vertical with respect to the pouring direction, The amount of pouring can be easily controlled.

  Further, as shown in FIG. 5, the nozzle 10 is formed in a substantially cylindrical shape, and the nozzle 10 is arranged on a line segment connecting the center 3 c (rotating shaft) and the center 10 c of the nozzle 10 in the first cross section. The axial center 10ax is preferably arranged. Thereby, the flow of the molten metal 2 passing through the nozzle 10 can be made smooth.

[Casting machine 2]
6 and 7 are cross-sectional views showing the configuration of another casting machine. Specifically, FIG. 6 shows a state at the start of casting, and FIG. 7 shows a state at the end of casting. The casting machine 140 shown in FIGS. 6 and 7 is different from the casting machine 100 shown in FIG.

  That is, in the casting machine 140, the chute 5 has an angle θ of 90 in the first cross section formed by the pouring direction from the ladle body 9 to the outside and the direction in which the tip of the chute 5 leads the molten metal 2 to the trough 6. Arranged to be less than °. In other words, the direction in which the molten metal 2 flows at the tip of the chute 5 is substantially the same in the horizontal direction and the direction of pouring from the nozzle 10. In the casting machine 140, the chute 5 has a circular arc in the first cross section, but the circular arc is not centered on the center 3c (not the second arc).

  The casting machine 100 can further stabilize the flow of the molten metal 2 than the casting machine 140, and can further stabilize the chute 5 from guiding the molten metal 2. However, also in the casting machine 140, the position where the chute 5 receives the molten metal 2 can be appropriately changed according to the rotation angle of the ladle body 9. Therefore, it is possible to stabilize the flow of the molten metal 2, suppress deterioration of the casting quality, and reduce damage to the chute 5.

[Manufacturing method of casting]
With reference to FIG. 6 and FIG. 7, the manufacturing method of the casting using the casting machine 140 is demonstrated below. The casting machine 100 can also be manufactured by a manufacturing method described below.

  When casting by the casting machine 140 is started, first, the molten metal 2 is poured from the arc ladle 3 through the nozzle 10. The molten metal 2 poured through the nozzle 10 is guided in the order of the chute 5 and the trough 6 and supplied to the mold 11 from the end of the trough 6 (molten supply process).

  At this time, the mold 11 and the sleeve 12 are rotated about the cylindrical axis of the mold 11 by the mold rotation mechanism 13. Further, at this time, as shown in FIG. 6, the trough 6 is moved by the trough moving unit 8 so as to move the end of the trough 6 toward the nozzle 10. Thereby, the terminal end of the trough 6 moves toward the nozzle 10 side in the mold 11. Accordingly, if the initial position of the trough 6 is set so that the molten metal 2 can be supplied to the end of the mold 11 opposite to the nozzle 10, the mold 11 can be moved from the end opposite to the nozzle 10 to the nozzle 10 side. The molten metal 2 is sequentially supplied to the end portion.

  Further, at this time, the trough 6 may be further inclined so that the cast part 7 side is lowered with respect to the rail of the trough moving part 8. Thereby, the molten metal 2 remaining on the trough 6 without flowing through the trough 6 can be guided without leaving the mold 11 from the end of the trough 6. As a result, it is possible to increase the utilization efficiency of the molten metal 2 and to prevent surplus soot (jam) from remaining on the trough 6.

  When the casting by the casting machine 140 is finished, the end of the trough 6 is closer to the nozzle 10 than the mold 11 as shown in FIG. The molten metal 2 is supplied over the entire mold 11. In addition, it is preferable that the arc ladle 3 pours a required amount of the molten metal 2 for each casting.

  Finally, FIG. 8 shows an example of a ladle refractory construction method. After forming bricks on the inner wall of the ladle iron skin and pouring the refractory, set the nozzle from the outer surface side of the ladle and fix the nozzle with patching material to install the refractory inside the ladle It is possible.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention is used in a nozzle structure for pouring molten metal from the inner surface of the ladle body to the outside of the ladle body, a casting machine equipped with the nozzle structure, and a method for producing a casting using the casting machine. be able to.

2 Molten metal 3 Arc ladle 3c Center of first circle 9 Ladle body 9b Bottom face portion 10 Nozzle (nozzle structure)
10n Curved surface portion 10y Cylindrical portion 11 Mold 100 Casting machine 140 Casting machine L1 Length Ln of the cylindrical portion along the pouring direction of the molten metal R Length of the inner wall of the curved surface portion Radius c1 of the second circle c1 First circle c2 Second circle ds Shortest distance rc1 between the nozzle and the center of the first circle Radius θ1 of the first circle Fan-shaped angle formed by the curved surface portion φ1 Opening diameter of the cylindrical portion φ2 Opening diameter of the inner end side of the ladle body in the nozzle

Claims (8)

The vertical cross-sectional shape has an inner surface that is a first arc, and is provided in a ladle body that is rotated about the center of a first circle that constitutes the first arc.
A nozzle structure for pouring molten metal from the inner surface of the ladle body to the outside of the ladle body,
The nozzle structure characterized in that, in the cross section in the vertical direction, the shortest distance between the nozzle structure and the center of the first circle is not less than the radius of the first circle. In the cross section in the vertical direction, the nozzle structure is
A cylindrical portion that is arranged on the outside of the ladle body and has a linear inner wall extending in the pouring direction of the molten metal;
It is arrange | positioned with respect to the said cylindrical part at the inner surface side of the said ladle main body, The curved surface part which has an inner wall which the opening diameter of the said nozzle structure expands toward the inner surface of the said ladle main body from the said cylindrical part is provided. The nozzle structure according to claim 1. In the vertical cross section,
The inner wall of the curved surface portion is composed of a second arc different from the first arc,
The radius of the 2nd circle which constitutes the 2nd above-mentioned circular arc is more than the opening diameter of the above-mentioned cylindrical part, and below the opening diameter of the end part by the side of the inner surface of the above-mentioned ladle main body in the above-mentioned nozzle structure. Item 3. The nozzle structure according to Item 2.   4. The nozzle structure according to claim 3, wherein, in the vertical cross section, the length of the inner wall of the curved surface portion is not less than 1/6 and not more than 1/4 of the circumference of the second circle.   5. The length of the cylindrical portion along the pouring direction of the molten metal in the vertical cross section is at least three times the opening diameter of the cylindrical portion. The nozzle structure according to the item.   The nozzle structure according to any one of claims 1 to 5, wherein the nozzle structure has a portion protruding from an outer surface of the ladle body.   A casting machine comprising the nozzle structure according to any one of claims 1 to 6. It is a manufacturing method of the casting using the casting machine according to claim 7,
A molten metal supply step of supplying the molten metal poured through the nozzle structure to the cylindrical mold of the casting machine,
Further, in the molten metal supply step, the molten metal supply portion to the mold is moved in the nozzle structure direction while rotating the mold around the cylindrical axis of the mold. Method.

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