JPS647010Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an assembly mold for electromagnetic stirring used in continuous casting.

(Prior Art) In continuous casting, liquid metal is poured from above into a water-cooled mold that is open at both the top and bottom, and is drawn out while solidifying. An assembled mold is usually used as this mold. That is, the mold is assembled by tightening two sets of opposing plates with bolts so as to have a rectangular cross-sectional area. This plate usually consists of a copper plate with good thermal conductivity that is in direct contact with the molten steel, and an outer wall that supports the copper plate, and is cooled with water. The cooling capacity of this mold determines the drawing speed of the slab. With assembly molds, even if the copper plate is worn out, the copper plate surface can be modified and reassembled easily.

Incidentally, in recent years, an electromagnetic stirring method has been applied to stir unsolidified molten steel and improve the quality of slabs. In this method, a solenoid is installed in a mold or a secondary cooling zone, and the alternating magnetic field generated by the solenoid applies electromagnetic force to the molten steel, creating a stirring flow.

When performing electromagnetic stirring in the mold, the solenoid
It is installed outside the assembly mold mentioned above. Incidentally, the magnitude of the magnetic field generated by the solenoid rapidly decays exponentially as the distance from the solenoid increases. Therefore, it is preferable to make the distance between the solenoid and the molten steel as close as possible. This allows greater stirring power to be obtained using the same solenoid and power supply, and a smaller solenoid or power supply is sufficient to achieve the same stirring power. Therefore, it is desirable to make the mold wall thickness as thin as possible.

An example of a conventional assembly mold is shown in FIGS. 1 to 4 (see the specification of Japanese Utility Model Application No. 57-94758).

In Fig. 1, 1 is a mold copper wall, 2,..., 2 is an outer wall, 3, 3 is a support frame, 4, 4 is a support member, and molten steel flows into the above-mentioned copper wall from above in Fig. 1. The molten steel is injected into the molten steel, and a solenoid 16, which will be described later, applies fluid motion to the molten steel. Note that the arrow indicates the direction of flow of cooling water.

The copper wall 1 includes four vertically long flat copper plates 1a, 1a,
A rectangular cylinder formed of 1b, 1b, 1
A set of wide-sided copper plates 1a, 1a and a set of narrow-sided copper plates 1b,
1b are arranged opposite to each other, and their respective widthwise ends are butted against each other. Each copper plate 1
As shown in FIGS. 2 and 3, a and 1b are elongated holes formed in the inner surface of each outer wall 2 that abut the outer periphery of the copper wall 1 and have a large number of stud bolts 5,..., 5 protruding from the outer surface thereof. 6 through the stud bolts 5, and fix each copper plate 1a, 1b to the outer wall 2 with a nut.

The outer wall 2 is made of a non-magnetic material, and as shown in FIG. 4, each wide copper plate 1a, 1b and each narrow copper plate 1b,
The wide outer walls 2a, 2a and the narrow outer walls 2b, 2b are brought into contact with the copper wall 1b in one-to-one correspondence, and are arranged in a rectangular cylindrical shape so as to surround the copper wall 1. Each of the above-mentioned outer walls 2 has a plurality of projecting portions 7,..., 7 protruding from the end face in the width direction at predetermined intervals, and the projecting portions 7,..., 7 are connected to the projecting portions 7 of the adjacent outer wall 2. ，…，
7 and are assembled alternately, and are slightly movable as the copper wall 1 expands due to thermal expansion. On each corresponding surface of each copper plate 1a, 1b and each outer wall 2a, 2b forming the above-mentioned copper wall 1, recesses 8, 9 recessed in the thickness direction of each member are provided, and both recesses are used to form a copper wall. In addition to forming a cooling water passage 10, uneven portions 8a are provided on the bottom surfaces of the recesses 8 of the copper plates 1a and 1b to enhance the cooling effect.

At the top and bottom of each of the above outer walls 2a and 2b,
As shown in FIG. 1, a plurality of water holes S penetrate in the thickness direction and communicate with the cooling water passage 10 described above.
1, ..., S1, S2, ..., S2 are provided, cooling water is supplied into the cooling water passage 10 from the lower water holes S2, ..., S2 to cool the copper wall 1, and the upper water holes S1,
..., the cooling water is discharged from S1.

In addition, a pair of opposing support frames 3, 3 are arranged around the outer periphery of the pair of wide-sided outer walls 2a, 2a, and both support frames 3, 3 are supported by a total of four stay bolts 11, 11, 11 on the upper, lower, left and right sides. The outer walls 2 are clamped together while being able to move slightly in the thickness direction of each of the narrow outer walls 2b, 2b due to thermal expansion of the copper wall 1.

Each support frame 3 has a water passage S connected to the water holes S1, ..., S1 in the wide outer wall 2a at its upper part.
3, and a lower box part 13 that forms two water passages, a first chamber S15 and a second chamber S16, at the bottom. The water passage S3 of the upper box part 12 is connected to the wide outer wall 2 through water holes S4, ..., S4 provided in the inner wall 12a of the box part.
The cooling water flowing through the cooling water passage 10 that communicates with the water holes S1, ..., S1 at the upper part of the wide outer wall 2a
The water is collected from the water holes S1, . . . , S1 in the upper box portion 12 through the water holes S4, . The first chamber S15 of the lower box part 13 is communicated with the water holes S2, ..., S2 in the lower part of the wide outer wall 2a through the water holes S5, ..., S5 provided in the inner wall 13a of the box part. As will be described later, the two chambers S16 are communicated with water holes S2, . . . , S2 at the bottom of the narrow outer wall 2b.

Hanger frame 4, upper and lower water boxes 14, 15
A solenoid 16 is disposed in the space surrounded by the narrow outer wall 2b, and a solenoid 16 is disposed between the support frame 3 and the wide outer wall 2a.
are arranged respectively to constitute an electromagnetic stirring device that electromagnetically stirs the molten steel descending within the copper wall 1.

Further, a pair of opposing support members 4, 4 are connected to both ends of the above-mentioned support frames 3, 3.
The mold is installed on a mold mount (not shown), that is, a vibrating frame, of continuous casting equipment. This vibrating frame also serves as a water supply frame, and cooling water for the mold is supplied and discharged from the vibrating frame through openings 18, 18, .

As described above, in conventional assembled molds, there are stay bolts and water supply and drainage passages on the outside of the mold wall, so the distance between the electromagnetic stirring solenoid and the molten steel is long.

(Purpose of the invention) An object of the invention is to provide an assembly mold for electromagnetic stirring having a structure in which a solenoid can be installed as close to molten steel as possible in order to improve the above-mentioned problems.

(Structure of the invention) For this reason, the electromagnetic stirring is assembled by making the mold side walls, which are made up of a copper wall in contact with molten steel and an outer wall supporting it, facing each other on all sides, and providing a cooling water passage between the copper wall and the outer wall. In the assembly mold, a large number of stud bolts are provided on one of the abutting surfaces of adjacent outer walls, and a fitting part for fitting each of the above-mentioned stud bolts is provided on the other abutting surface. It is assembled by tightening from the outside of the fitting part, and the pair of opposing outer walls are each provided with a support arm extending from the upper end of the outer wall to the mold installation stand, and a water supply and drainage passage connecting the above-mentioned water passage is provided within the support arm. shall be.

(Example) FIG. 5 and FIG. 6 are a plan view and a front sectional view, respectively, of a continuous casting apparatus to which Example 1 is attached. In FIG. 5, the mold copper wall is a rectangular cylinder formed of four vertically long flat copper plates 21a, 21a, 21b, 21b, and one set of wide copper plates 21a, 21a, 21b, 21b.
a, 21a and a pair of narrow width copper plates 21b, 21b are arranged opposite to each other so that their widthwise ends are butted against each other. The wide outer wall 22a is shown in FIGS. 7 to 11, and the narrow outer wall 22b is shown in FIGS.
As shown in FIG. Each of the above copper plates 21a
Although not shown, a large number of stud bolts are attached to the outer surfaces of the copper plates 21a and 21b, and each of the copper plates 21a and 21b is attached to the outer walls 22a and 22b, which are in contact with each other.
Insert the stud bolt mentioned above into the elongated hole 23,
Tighten and secure with nuts. Furthermore, openings 24 for bolts are provided in the side surface of the wide outer wall 22a, while a large number of screw holes 25 are provided in the side surface of the narrow outer wall 22b, corresponding to the positions of the openings 24. By inserting stud bolts (not shown) into the screw holes 25 and tightening them with nuts through the holes 24, the wide copper plate 21a and the narrow copper plate 2
1b is fixed to form a mold of a rectangular cylinder. At this time, a gap is provided between the wide outer wall 22a and the narrow outer wall 22b. Note that the groove 26,
26 is a groove for an O-ring.

There are two water chambers 27 inside the wide outer wall 22a.
a, 27b are provided by the partition wall 28. An arm portion 22C for attaching the mold to the vibration frame 41 is provided at the upper end of the wide outer wall 22a.

Water supply and drainage is performed through this arm portion 22C.
Cooling water first flows from the vibrating frame 41 to the water chamber 27a through the opening 29a provided in the arm 22C.
to go into. On the one hand, it passes through the water holes 30a, 30a and enters the water passage between the wide outer wall 22a and the wide copper plate 21a, and on the other hand, it passes through the water holes 31a, 31a, and enters the water hole in the narrow outer wall 22b. 32a, 32a
It passes through and enters the water passage between the narrow outer wall 22b and the copper plate 21b. On the other hand, the cooling water flows from the water passage between the wide outer wall 21a and the wide copper plate 22a.
Through the water holes 30b, 30b, and on the other hand, from the water passage between the narrow outer wall 21b and the narrow copper plate 22b, through the water holes 32b, 32b, and through the water holes 31b, 31b. , enters the water chamber 27, and exits through the opening 29b. In addition, FIG. 10 and FIG. 11 show the long hole 23a passing through the boundary of the water chamber,
A cross section of the elongated hole 23b passing through each water chamber is shown.

Furthermore, screw holes 33a and 33b for positioning pins are provided in the outer walls 22a and 22b, respectively.

The connector shown in FIG.
It is connected between 1a and 32a and between water holes 31b and 32b. Two cylindrical bodies 35 and bellows 3
6 is attached, and these two bellows are connected via a concave intermediate metal fitting 37, and the water passage 38
is formed and kept airtight by O-rings 39, 39. The length of the water passage 38 is the bellows 36, 36
Changes due to expansion and contraction.

The mold assembled as described above is fixed to the vibrating frame 41 by passing bolts through the bolts 42, 42, . Further, a positioning adjuster 43 is attached to one of the wide outer walls, and is used to adjust the position of this wide outer wall with respect to the vibration frame 41. Note that the vibrating frame 41 also serves as a water supply frame, and supplies and drains water through the openings 28a and 28b.

Note that the vibration frame 41 is a fixed frame 44.
The fixed frame 44 is supported by a vibration lever 45 and is vibrated by a vibration exciter (not shown). The slab 46 is rolled by rolls 47, 47, 4
8, 48, and so on, and is pulled down.

Example 2 Similar to Example 1, the mold copper wall is a rectangular cylinder consisting of a set of wide copper plates 51a and a set of narrow copper plates 51b, and the outer surface of each copper plate 51a and 51b is A large number of stud bolts are installed.
Note that the inner surface of the wide copper plate 51a is provided with a recessed portion in order to take the corners of the slab.

In this embodiment, as schematically shown in FIG. 17, the narrow outer wall 52b of the assembled mold is shaped like a cross and is fitted into the wide outer wall 52a. As in Example 1, stud bolts are used instead of stay bolts, and water supply and drainage to the mold is performed only from the upper surface of the mold.

The wide outer wall 52a is shown in FIGS. 18-22. Further, the narrow outer wall 52b is shown in FIG. 23-2.
This is shown in Figure 7. A number of openings 53 are provided in the outer walls 52a and 52b for passing stud bolts attached to the copper plates 51a and 51b, and the corresponding outer walls and the copper plates are fixed by tightening with nuts. A groove 54 is provided in the convex portion of the narrow outer wall 52b, and a screw hole 55 corresponding to the groove 54 is provided in the side surface of the concave portion of the wide outer wall 52a. Using the stud bolts 56, the pair of wide outer walls 52a and the pair of narrow outer walls 52b are assembled by fitting the irregularities. This fit facilitates mold assembly. Note that distortion of the outer wall is prevented by tightening the gap 59 using the disc spring 57 and the nut 58.

Figures 29 to 32 show a continuous casting machine equipped with this embodiment. In these figures, arrows indicate the direction of cooling water flow. Wide outer wall 52a
A water supply and drainage section 61 is provided perpendicularly to the surface on the upper part of the vibration frame 62, and this water supply and drainage section 61 is fixed to a vibrating frame 62. This vibrating frame 62 also serves as a water supply frame. The solenoid 63 is installed outside the mold. Note that the vibration frame 62 is supported by a fixed frame (not shown), and the fixed frame is vibrated.

Cooling water flows as follows. The cooling water first enters the water supply passage 71 of the vibrating frame 62, and then enters the water supply passage 7 of the water supply and drainage section 61 of the wide outer wall 52a.
Enter 2. Next, the cooling water passes through the opening 73 at the top of the wide outer wall 52a, enters the cooling water passage 74 of the narrow outer wall 52b, flows inside the narrow outer wall 52b to the lower end 75, and then splits into two. One side passes through the opening 76 of the narrow outer wall 52b and passes through the wide outer wall 52a.
The water enters the passage 77, then ascends the cooling water passage 78 between the wide outer wall 52a and the wide copper plate 51a, passes through the opening 79, and enters the drainage passage 80 of the water supply and drainage section 62.
Go out. The other side is the narrow outer wall 52b and the narrow copper plate 51.
b through the cooling water passage 81 between the upper end portion 82
and then exits through the opening 83 and through the opening 84 in the wide external wall, likewise into the drainage channel 80 . Finally, it exits from the discharge port 85 to the vibrating frame 62 via the drainage passage 86. In addition, the O-ring grooves 86, 8
6,... are provided for airtightness.

Note that even in the case of a mold that does not use electromagnetic stirring, the structure can be simplified by using the present invention.

(Effects of the invention) According to the invention, the structure on the outside of the assembled mold is simplified by not using stay bolts and by simplifying the structure of water supply and drainage outside the mold.

Therefore, especially when performing electromagnetic stirring, the solenoid can be installed closer to the molten steel, so the stirring force can be increased, and the solenoid and power source can be made smaller.

Furthermore, when attaching an electromagnetic stirrer to an existing continuous casting machine, the structure of the mold can be simplified, so that the scope of modification can be narrowed. That is, unlike the conventional method, there is no need for a sandwich frame, a hanger frame, a stay bolt, etc., and water supply and drainage to the back surface of the copper plate of the mold is also carried out through the support arms.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of a conventional mold. FIG. 2 is a front view of the copper wall of the mold shown in FIG. 1. FIG. 3 is a sectional view taken along line A-A in FIG. 1.
FIG. 4 is a partially cutaway plan view of the mold shown in FIG. 1. FIG. 5 is a plan view of the continuous casting apparatus to which Example 1 is attached, and FIG. 6 is a front sectional view of FIG. 5. FIG. 7 is a front partial cross-sectional view of the wide-sided outer wall of Example 1. FIG. 8 is a plan view of FIG. 7. FIG. 9 is a sectional view taken along line B-B in FIG. 7. 10 and 11 are cross-sectional views of the elongated hole. FIG. 12 is a front view of the narrow outer wall of Example 1. FIG. 13 is a right side view of FIG. 12. FIG. 14 is a left side view of FIG. 12. FIG. 15 is a sectional view taken along line CC in FIG. 14. FIG. 16 is a cross-sectional view of the water passage between the wide outer wall and the narrow outer wall. FIG. 17 is a schematic perspective view showing the assembly of the second embodiment. FIG. 18 is a front partial cross-sectional view of the wide-sided outer wall of Example 2. 1st
FIG. 9 is a partial cross-sectional plan view of FIG. 18. Second
0 is a partial cross-sectional view taken along the line DD in FIG. 18. FIG. 21 is a side view of FIG. 18. Second
FIG. 2 is a front view on the opposite side of FIG. 18. Second
FIG. 3 is a front view of the narrow outer wall of Example 2. FIG. 24 is a partial cross-sectional plan view of FIG. 23. FIG. 25 is a sectional view taken along line FF in FIG. 23. FIG. 26 is a sectional view taken along line GG in FIG. 23. FIG. 27 is a left side view of FIG. 23. FIG. 28 is a front view on the opposite side of FIG. 23. 29-32 are diagrams showing the assembled mold of Example 2, and FIG. 29 is a diagram showing the H--FIG.
The sectional view taken along line H, FIG. 30, is taken from I-I in FIG. 29.
31 and 32 are cross-sectional views taken along line J--J and line K--K in FIG. 30, respectively. 21a, 21b...Copper wall, 22a, 22b...Outer wall, 24, 24,...Elongated hole for bolt, 25, 25,
...Screw holes for bolts, 51a, 51b...Copper wall, 52
a, 52b...Outer wall, 54, 54,...Bolt hole,
55, 55, ...Screw hole for bolt.

Claims (1)

[Claim for Utility Model Registration] An electromagnetic stirrer assembled by having side walls of a mold consisting of a copper wall in contact with molten steel and an outer wall supporting it facing each other on all sides, and providing a cooling water passage between the copper wall and the outer wall. In the assembly mold, one of the abutting surfaces of adjacent outer walls is provided with a large number of stud bolts, while the other abutting surface is provided with a large number of stud bolts.
Providing a fitting part for fitting each of the above stud bolts,
The outer walls are assembled together by tightening each stud bolt from the outside of the mating portion, and each of the pair of opposing outer walls is provided with a support arm extending from the upper end of the outer wall to the mold mount, and the above-mentioned outer walls are provided within the support arm. An assembly mold for electromagnetic stirring, characterized by providing a water supply and drainage passage connected to a water passage.