JP5675480B2 - Ladle - Google Patents

Description

  The present invention relates to a ladle, and more particularly to a ceramic ladle in which a metal reinforcing member is embedded.

  Conventionally, some ladles used in the casting process are made of a ceramic molded body having excellent corrosion resistance. In such a ceramic ladle (hereinafter simply referred to as a ladle), a technique for embedding a metal reinforcing member to improve mechanical strength is known (see, for example, Patent Document 1). In a ladle in which a metal reinforcing member is embedded, there is a problem that durability is lowered due to an influence (deviation between different materials) due to a difference in thermal expansion coefficient between the ceramic molded body and the metal reinforcing member.

Japanese Patent Laid-Open No. 10-296427

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ladle having corrosion resistance, mechanical strength and durability.

In order to solve the above problems, the ladle of the present invention is a ladle configured by ceramic molded body lower portion side to form an opening in and an upper end portion with a bottom, it is buried in the opening peripheral wall of the ceramic bodies The metal reinforcing member has an annular shape, and the metal reinforcing member includes a first member formed in a U-shape along the opening, a second member disposed below a pouring gate, and the first member. A pair of third members connecting the lower portions of the end portions of the members and the upper portions of the end portions of the second members, and the upper portions of the end portions of the first members extending along the upper portions of the pouring gates. Including a pair of fourth members to be joined, a pair of cylindrical fifth members disposed on the outside of the pouring spout, and a sixth member as an attachment piece for supporting each fifth member, Ltd. reinforcing member have a plurality of through holes penetrating between the inner diameter side and outer diameter side, Serial metallic reinforcing member, the upper end portion of the ceramic molded body, characterized in that it is embedded in the 1/20 to 1/4 of the range of height of the ceramic body.

(Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of the items (1) to ( 3 ) corresponds to each of claims 1 to 3 described in the claims.

(1) a ladle configured by ceramic molded body lower portion side to form an opening in and an upper end portion with a bottom, having a metallic reinforcing member annulus embedded in the opening peripheral wall of the ceramic molded body, made of metal The reinforcing member includes a first member formed in a U-shape along the opening, a second member disposed below the pouring spout, a lower portion of each end portion of the first member, and each end portion of the second member. A pair of third members that connect the upper part of the first member, a pair of fourth members that extend along the upper part of the pouring spout and are joined to the upper part of each end of the first member, and a pair disposed outside the pouring spout A cylindrical fifth member, and a sixth member as a mounting piece for supporting each fifth member, and the metal reinforcing member includes a plurality of penetrating holes between the inner diameter side and the outer diameter side. have a through hole, the metallic reinforcing member, the upper end portion of the ceramic molded body, the height of the ceramic bodies Ladle characterized in that it is embedded in a range of 1/20 to 1/4.
According to the ladle described in this section, the influence due to the difference in thermal expansion coefficient between the ceramic molded body and the metal reinforcing member, that is, the ceramic part (ceramic molded body) and the metal part (metal) due to the difference in thermal expansion coefficient. Cracks caused by peeling (displacement) occurring at the interface with the reinforcing member) can be effectively suppressed, and the durability of the ladle can be improved. And the upper part side of the ladle (ceramic molded object) to which the largest load acts in the state in which the molten metal was thrown into the ladle can be effectively reinforced.
Also, by embedding a metal reinforcing member (first reinforcing portion) in a range of 1/20 to 1/4 of the height of the ceramic molded body, the coefficient of thermal expansion between the ceramic molded body and the metal reinforcing member It is possible to more effectively suppress the influence due to the difference between the two. If the height of the ceramic molded body (laddle) is set to 400 mm, the metal reinforcing member (first reinforcing portion) is moved 20 mm downward from the upper end (upper end surface) of the ceramic molded body (laddle). It is sufficient to embed in the range of 100 mm.

(2) The metal reinforcing member has a wall thickness of 0.1 to 0.3 times the wall thickness of the opening peripheral wall of the ceramic molded body and a vertical width of 0.05 to 0.20 times the height of the ceramic molded body (1) Ladle.
According to the ladle described in this section, it is possible to more effectively suppress the influence due to the difference in the coefficient of thermal expansion between the ceramic molded body and the metal reinforcing member. If the height of the ceramic molded body (laddle) is 400 mm, the vertical width of the metal reinforcing member may be set to 20 mm to 80 mm.
The metal reinforcing member can be composed of expanded metal. In addition, the metal reinforcing member is, for example, formed in a belt shape and extends around the opening peripheral wall of the ceramic molded body, and is disposed around the pouring port on the front side of the ladle to reinforce the pouring portion of the ladle. It can comprise by the 2nd reinforcement part to do. In this case, the vertical width of the metal reinforcing member described above is a dimension in the vertical direction of the first reinforcing portion (the height direction of the ladle). Further, the thickness of the metal reinforcing member is the thickness of the expanded metal. Furthermore, in the aspect of this term, the expanded metal constituting the first reinforcing portion and the expanded metal constituting the second reinforcing portion are the same. And a 2nd reinforcement part can be comprised by joining the some member which consists of an expanded metal by welding etc. As shown in FIG. Further, the height of the ceramic molded body, in other words, the height of the ladle is a distance from the upper end (upper end surface) of the ceramic molded body forming the opening of the ladle to the lower surface of the ceramic molded body.

( 3 ) In the metal reinforcing member, the average hole diameter of the through holes is 3 to 4 times the wall thickness, and the interval between the adjacent through holes is at least 1 to 2 times the average hole diameter of the through holes (1 ) , (2) Ladle.
According to the ladle described in this section, it is possible to more effectively suppress the influence due to the difference in the coefficient of thermal expansion between the ceramic molded body and the metal reinforcing member.
In the aspect of this section, the average pore diameter of the through-holes is because the through-holes are not limited to a circle (perfect circle) but include an oval, a polygon, and the like. Moreover, the space | interval between adjacent through-holes is the distance between the parts which adjoin most between adjacent through-holes.
In the aspect of this section, the interval between the adjacent through holes can be replaced with the hole area ratio in the metal reinforcing member.

  According to the present invention, a ladle having corrosion resistance, mechanical strength, and durability can be provided.

It is a perspective view of the ladle of this embodiment. It is a perspective view of the metal reinforcement member embed | buried under the ladle of this embodiment. This is a chart showing the results of computer simulation. The horizontal axis represents the ratio of the wall thickness W2 of the metal reinforcing member to the wall thickness W1 of the opening peripheral wall of the ladle, and the ratio of the load resistance to the load acting on the ladle is FIG. 6 is a diagram showing the performance of a plurality of types of metal reinforcing members having different magnifications of the vertical width H2 of the metal reinforcing member with respect to the height H1 of the ladle when set on the shaft. It is a chart showing the results of computer simulation, and the horizontal axis indicates the magnification of the interval between adjacent through holes with respect to the average hole diameter of the through holes formed in the metal reinforcing member, and the load resistance against the load acting on the ladle It is a diagram which shows the performance of several types of metal reinforcement members from which the average hole diameter of a through-hole differs when the magnification of this is set to a vertical axis | shaft.

An embodiment of the present invention will be described with reference to the accompanying drawings. Hereinafter, for convenience of explanation, as shown in FIG. 2, the vertical direction, the front-rear direction, and the left-right direction are defined. 1 is defined as an upper portion 2 of the ladle 1, and a lower portion of the ladle 1 in FIG.
In the following description, the upper part 2 and the lower part 3 of the ladle 1 and the upper part 2 and the lower part 3 of the ceramic molded body 5 are substantially the same. Similarly, the opening 4 of the ladle 1 and the opening (4) of the ceramic molded body 5 are the same in practice.

  As shown in FIG. 1, the ladle 1 of the present embodiment is configured by a ceramic molded body 5 having a bottom on the lower side 3 and an opening 4 on the upper side 2, as in the known technology. . An annular metal reinforcing member 6 shown in FIG. 2 is embedded on the upper portion 2 side of the ceramic molded body 5. The metal reinforcing member 6 includes a plurality of members 8 to 14 formed of expanded metal having through holes 7, and the metal reinforcing member 6 is configured by welding and joining these members 8 to 14. The

  As shown in FIG. 2, the metal reinforcing member 6 is disposed below the first member 8 formed in a substantially U shape along the opening 2 of the ladle 1 and below the pouring port 15 (see FIG. 1) of the ladle 1. Each of the second member 9 to be arranged and a pair of left and right sides of the pouring port 15 of the ladle 1 are connected to connect the lower side of each end of the first member 8 and the upper side of each end of the second member 9. A third member 10, a fourth pair that is disposed in a pair of left and right portions extending in the front-rear direction along the upper portion of the pouring port 15 of the ladle 1 and having the lower side of the rear end joined to the upper side of each end of the first member 8. A member 11, a cylindrical fifth member 12 provided in a pair on the left and right in front of the pouring port 15 of the ladle 1, and a sixth member 13 as an attachment piece used for supporting each fifth member 12 are included.

  Further, the metal reinforcing member 6 includes a substantially V-shaped seventh member 14 provided between the pair of left and right fourth members 11. The seventh member 14 can effectively reinforce the pouring port 15 of the ladle 1. In the seventh member 14, the inner side of the V-shaped valley is formed in an R shape having a predetermined radius of curvature instead of a pin angle (ridge), and thereby stress concentration in the valley of the seventh member 14. Can be prevented. And the metal reinforcement member 6 is also excluded from the pin angle in the members 8 to 13. Each of the third members 10 has a corner 10a on the upper side of the rear end portion formed at an acute angle. In addition, an R-shaped portion 16 having a predetermined radius of curvature is formed at a joint portion between the corner portion 10 a of each third member 10 and the first member 8.

  Further, the opening 17 of the metal reinforcing member 6 is not substantially U-shaped along the periphery of the pouring port 15 of the ladle 1, and as shown in FIG. 2, the upper side having the bottom 17a and the pair of vertical sides 17b is open. It is formed in a substantially U shape. Note that, at the corners of the bottom 17a of the opening 17 and the vertical sides 17b, an R shape is formed instead of a pin angle. Further, the bottom 17a is formed at a position lower than the conventional one with respect to the pouring port 15.

  3 shows the thickness W2 (see FIG. 2) of the metal reinforcing member 6 relative to the wall thickness W1 (see FIG. 1) of the opening peripheral wall 18 of the ladle 1 (ceramic molded body 5), that is, the metal reinforcement. The ratio of the thickness of the expanded metal constituting the member 6 is set on the horizontal axis, and the ratio of the load resistance to the load acting on the ladle 1 during normal use is set on the vertical axis, so that the height H1 of the ladle 1 (see FIG. 1), the ratio of the vertical width H2 (see Fig. 2) of the metal reinforcing member 6 (first member 8) is A1: 0.03 times, A2: 0.05 times, A3: 0.1 times, A4: 0.2 times, A5 : The performance of each metal reinforcing member 6 of A1 to A5 when 0.3 times is represented by a diagram.

  FIG. 3 shows the result of computer simulation when 10 cycles of one cycle consisting of heating (700 ° C.) and cooling (air cooling) are performed. In the drawing, “x” indicates that a crack occurred in the ceramic molded body 5. That is, it indicates that the Mises stress has reached the yield point of the ceramic molded body 5, and ○ in the figure indicates that there is no abnormality, that is, the Mises stress has not reached the yield point of the ceramic molded body 5, and cracks are generated. Indicates not. In the present embodiment, the load-bearing magnification (safety magnification) required for the ladle 1 is set to 3.

  As can be understood from FIG. 3, the conditions for satisfying the load resistance required for the ladle 1 are as shown in the diagrams A2, A3, and A4, where the thickness W2 of the metal reinforcing member 6 is the opening of the ladle 1 (ceramic molded body 5). This is when the wall thickness W1 of the peripheral wall 18 is 0.1 to 0.3 times. In other words, the condition for satisfying the load resistance required for the ladle 1 is that the wall thickness W2 of the metal reinforcing member 6 is 0.1 to 0.3 times the wall thickness W1 of the opening peripheral wall 18 of the ladle 1 (ceramic molded body 5). In addition, the vertical width H2 of the metal reinforcing member 6 (first member 8) is 0.05 to 0.20 times the height H1 of the ladle 1 (ceramic molded body 5) (hereinafter referred to as condition 1).

  On the other hand, FIG. 4 sets the magnification of the interval between adjacent through holes 7 with respect to the average hole diameter of the through holes 7 formed in the metal reinforcing member 6 on the horizontal axis, and in the same way as in FIG. The load capacity magnification against the load acting on the ladle 1 is set on the vertical axis, and the average hole diameter magnification of the through hole 7 with respect to the wall thickness W2 (see FIG. 2) of the metal reinforcing member 6 is B1: 2 times, B2: The performance of each of the metal reinforcing members 6 of B1 to B4 in the case of 3 times, B3: 4 times, and B4: 5 times is represented by a diagram.

  FIG. 4 shows the result of computer simulation when 10 cycles of one cycle consisting of heating (700 ° C.) and cooling (air cooling) are performed, as in FIG. It indicates that a crack has occurred in the body 5, that is, the Mises stress has reached the yield point of the ceramic molded body 5, and ○ in the figure indicates that there is no abnormality, that is, the Mises stress has reached the yield point of the ceramic molded body 5. It indicates that no crack has occurred. As in the case of FIG. 3, the load-bearing magnification (safety magnification) required for the ladle 1 was set to 3.

  As can be understood from FIG. 4, the condition for satisfying the load resistance required for the ladle 1 is that in the diagrams B2 and B3, the magnification of the interval between the adjacent through holes 7 with respect to the average hole diameter of the through holes 7 is 1.0 to 2.0. When it is double. In other words, the condition for satisfying the load resistance required for the ladle 1 is that the average hole diameter of the through holes 7 is 3 to 4 times the wall thickness W2 of the metal reinforcing member 6, and the distance between the adjacent through holes 7 is as follows. Is at least 1 to 2 times the average pore diameter of the through-holes 7 (hereinafter referred to as condition 2). As shown in FIG. 4, the description that the interval between adjacent through holes 7 is at least 1 to 2 times the average hole diameter of the through holes 7 is that the opening ratio of the through holes 7 in the metal reinforcing member 6 is at least. It is possible to replace the description with 10% to 23%.

  Furthermore, in order to satisfy the load resistance required for the ladle 1, the metal reinforcing member 6 is moved from the upper end portion 19 of the ladle 1 (ceramic molded body 5) to 1/20 to 1/4 of the height H1 of the ladle 1. It is desirable to embed in the range R (see FIG. 1) (hereinafter referred to as condition 3). This has been found from the results of computer simulation by the applicant.

This embodiment has the following effects.
According to the present embodiment, the ring-shaped metal reinforcing member 6 is embedded in the upper portion 2 side of the ceramic molded body 5, and the inner diameter side and the outer diameter side of the metal reinforcing member 6 have a thickness W2 (plate thickness). Since the ladle 1 is configured by providing a plurality of through holes 7 penetrating in the direction, the influence due to the difference in thermal expansion coefficient between the ceramic molded body 5 and the metal reinforcing member 6, that is, the difference in thermal expansion coefficient. Cracks caused by peeling (displacement) occurring at the interface between the ceramic portion (ceramic molded body 5) and the metal portion (metal reinforcing member 6) can be effectively suppressed. As a result, the durability of the ladle 1 can be suppressed. It becomes possible to improve. Furthermore, since the upper part 2 side of the ladle 1 (ceramic molded body 5) to which the largest load is applied in a state where the molten metal is poured into the ladle 1 is effectively reinforced, the mechanical strength of the ladle 1 can be improved. it can.

  Further, the condition 1, that is, the thickness W2 of the metal reinforcing member 6 is set to 0.1 to 0.3 times the wall thickness W1 of the opening peripheral wall 18 of the ladle 1 (ceramic molded body 5), and the metal reinforcing member 6 (first member). 8) The vertical width H2 of 0.05 to 0.20 times the height H1 of the ladle 1 (ceramic molded body 5) is affected by the difference in thermal expansion coefficient between the ceramic molded body 5 and the metal reinforcing member 6. Can be more effectively suppressed.

  Furthermore, in condition 2, that is, the average hole diameter of the through holes 7 is 3 to 4 times the wall thickness W2 of the metal reinforcing member 6, and the interval between the adjacent through holes 7 is at least 1 to the average hole diameter of the through holes 7. By making it 2 times, the influence by the difference of the thermal expansion coefficient between the ceramic molded object 5 and the metal reinforcement members 6 can be suppressed much more effectively.

In addition, the metal reinforcing member 6 is placed in the condition 3, that is, in the range R of 1/20 to 1/4 of the height H1 of the ladle 1 from the upper end portion 19 of the ladle 1 (the upper end portion 19 of the ceramic molded body 5). By embedding, the influence by the difference of the thermal expansion coefficient between the ceramic molded body 5 and the metal reinforcing member 6 can be more effectively suppressed.
A person skilled in the art will understand that it is desirable to configure the ladle 1 so as to satisfy the above-described conditions 1 to 3 at the same time.

In addition, embodiment is not limited above, For example, it can comprise as follows.
In the present embodiment, the metal reinforcing member 6 is configured by joining a plurality of members 8 to 14 by welding, but adjacent members may be configured as a single member.
In the present embodiment, expanded metal is used as the material of the metal reinforcing member 6 and the through hole 7 is circular. For example, the through hole 7 is elliptical, polygonal, or a combination thereof. be able to.

1 ladle, 2 upper part, 3 lower part, 4 opening, 5 ceramic molded body, 6 metal reinforcing member, 7 through-hole, 18 opening peripheral wall, 19 upper end part

Claims (3)

A ladle composed of a ceramic molded body having a bottom at the bottom and an opening at the upper end,
An annular metal reinforcing member embedded in the opening peripheral wall of the ceramic molded body;
The metal reinforcing member includes a first member formed in a U-shape along the opening, a second member disposed below the pouring gate, a lower portion of each end of the first member, and the first member. A pair of third members that connect the upper portions of the end portions of the two members, a pair of fourth members that extend along the upper portion of the pouring spout and are joined to the upper portions of the end portions of the first member, A cylindrical fifth member disposed in a pair on the outside of the pouring spout, and a sixth member as an attachment piece for supporting each fifth member,
The metal reinforcing member has a plurality of through holes penetrating between the inner diameter side and the outer diameter side,
The metal reinforcing member is embedded in a range of 1/20 to 1/4 of the height of the ceramic molded body from the upper end of the ceramic molded body. The metal reinforcing member has a wall thickness of 0.1 to 0.3 times the wall thickness of the opening peripheral wall of the ceramic molded body, and a vertical width of 0.05 to 0.20 times the height of the ceramic molded body. The ladle according to claim 1. In the metal reinforcing member, the average hole diameter of the through holes is 3 to 4 times the wall thickness, and the interval between the adjacent through holes is at least 1 to 2 times the average hole diameter of the through holes. The ladle according to claim 1 or 2, wherein

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