JPS5929344B2 - Mold fastening device for continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold fastening device for a continuous casting machine, and more specifically, a pair of wide long side molds sandwich a pair of short side molds disposed between them. The present invention relates to a fastening device for fastening long side molds to each other in a so-called assembled mold in which a rectangular mold is assembled using these four molds.

As is well known, in a continuous casting machine, molten steel is poured into a mold from a tundish and is rapidly cooled by water cooling, solidifying from the part in contact with the mold wall and forming a solidified shell; As continuous casting slabs (hereinafter simply referred to as slabs) undergo heat shrinkage, in order to prevent gaps from forming between the mold and the slabs, or a delay in the cooling of that part due to this. , it is necessary to set a certain taper in the mold so that it gradually becomes narrower toward the bottom, and if a certain gap is created between the long side molds 1 and 1' and the short side mold 2, In particular, near the molten steel surface in the mold, the molten steel 3 may enter the gap as shown in Figure 1, resulting in a serious accident such as leakage of molten steel. It is necessary to tighten them together so that there is no gap between them and the short side mold 2.

Conventionally, fastening devices configured as shown in FIGS. 2 and 3 have been known or proposed as fastening devices that can meet the above requirements.

That is, the fastening device shown in FIG. 2 fixes one long-side mold 1' to the support frame 4, and the other long-side mold 1 is movable horizontally in the thickness direction of the slab and vertically movable. It is placed on a support frame so that it can support the load, and the other long side mold 1
A single-acting hydraulic cylinder 5 is attached to a predetermined location of the support frame 4 facing the outer wall surface of the mold 1, and a stopper 7 provided at the tip of the piston rod 6 is attached to the outer wall surface of the long side mold 1. 8, and by pushing the piston 9 forward with the elastic force of a disc spring 100 normally disposed on the rear side of the piston 9, the long side mold 1 is moved to a fixed length via the piston rod 6. Pressure oil is applied to the front side of the piston 9 when pressing it toward the side mold 1', and when cleaning the copper plate on the inner wall of the mold or moving the short side mold 2 to change the width of the slab. By supplying the piston rod 6 with
is configured to move backwards.

The fastening device shown in FIG. 3 fixes a fastening rod 11 to one long-side mold 1' fixed to a support frame 4, and passes the tip of the fastening rod 11 through the other long-side mold 1. A nut 12 is screwed into the protruding portion, and a disc spring 13 is disposed between the outer wall surface of the long side mold 1 and the nut 12, and the nut 12 and disc spring 13 are housed therein. The cylinder tube 14 is fixed to the outer wall surface of the long-side mold 1, and a piston 15 is installed inside the rear end of the cylinder tube 14, and a disc spring 13 is normally installed.
The long side mold 1 is pressed with zero elastic force toward the fixed long side mold 1', and when cleaning the copper plate on the inner wall of the mold or moving the short side mold 2, the width of the slab is adjusted. When changing, for example, the long side mold 1 is moved back together with the cylinder tube 14 by supplying pressure oil to the rear side of the piston 15.

However, in the fastening device shown in FIG. 2 or the fastening device shown in FIG.
, 1' and the short-side molds 2, 2' can be satisfied, but on the other hand, the short-side molds 2, 2' can be moved to reduce the width of the slab. There are disadvantages to making the change as described below.

That is, in the fastening device shown in FIG. 2 or 3, the copper plates 2a and 2a' on the inner wall surfaces of the short side molds 2 and 2'
thermally expands during casting, the side edges of the copper plates 2a, 2a' are Fourth
As shown in the figure, the copper plate 1a on the inner wall surface of the long side molds 1, 1'
, la', and as a result, when changing the width of the slab during casting, the force required to move the short side molds 2, 2' is determined by theoretical factors such as static iron pressure. Due to the load and the frictional resistance between the molds 1゜1', 2, 2' and the same soil on each long and short side,
Copper plates 1a, 1a', 2a that are biting into each other
.

This results in a considerably large force including the load for deforming the molds 2a', and there are problems such as the need for a large-sized and large-capacity device for moving the short-side molds 2, 2'.

Therefore, conventionally, when moving the short side molds 2, 2', pressure oil is supplied to the hydraulic cylinder 5 or cylinder cylinder 14 to move the long side mold 1 backward by about 0.01 to 1.0 degrees. Accordingly, each copper plate 1a, la', 2a.

2a' Mutual biting has been eliminated, but such operations must be performed while the operator is performing normal casting work, and this operation often overlaps with successive casting of different steel types. Combined, this puts a heavy burden on the operator, which can lead to operational errors or omissions, resulting in abnormalities in casting, or changing the width by moving the short side mold 2.2'. There was a problem that the equipment could be damaged.

Also. In the fastening device shown in Fig. 2, the receding movement dimension of the long-side mold 1 may be 1.0- or less when changing the width of the slab, and the copper plates 1a, 1a of the long-side molds 1, 1' are inspection,
When cleaning, a distance of 2.0 mm or more is required, so the expansion allowance δ1 of the long-side mold 1, that is, the distance between the tip surface of the hydraulic cylinder 5 and the end surface of the stopper 8, is set to be large (setting Inside, a spacer (not shown) is inserted between these, and the spacer is removed during inspection or cleaning to obtain the required movement dimension of the long side mold 1.
Since it is virtually impossible to remove spacers online, inspection and cleaning of the copper plates 1a and 1a' must be done offline. There was a problem in that it became impossible to detect scratches on the surface of the copper plate, adhesion of splashes, etc., resulting in a decline in the quality of the slab.

As shown in FIG. 5, the fastening device is designed to solve the above-mentioned problems, and the fastening rod 16 is arranged to pass through each long side mold 1, 1', and the length of one of the rods 16 is A spring retainer 17 that comes into contact with the outer wall surface is fitted into a portion of the side mold 1' that protrudes toward the outer wall surface, and a spring retainer 18 is placed at a predetermined interval behind the mold 1' with a nut 19 to prevent removal. A spring 20 having an elastic force smaller than the bulging force of the molten steel is interposed between the spring holder 17 and the spring holder 18, and a sleeve 21 whose tip end is locked to the spring holder 17 is inserted between the spring holder 17 and the spring holder 18. The rod 16 is attached to the presser foot 18, and a nut 22 is screwed onto the part of the rod 16 that protrudes toward the outer wall of the mold 1 on the other long side. A frame body 24 which encloses and accommodates these nuts 22 and springs 23 with a spring 23 having an elastic force greater than the bulging force is fixed to the long side mold 1, and a rod 16 protrudes from this frame body 24. A fastening device has been proposed in which a nut 25 serving as a stopper is threaded onto the end of the bolt.

According to such a fastening device, the long side mold 1 is fixed using the spring 20 having an elastic force smaller than the bulging force of the molten steel.
, 1' are tightened, molds 1, 1 on each long and short side are tightened.
The copper plates attached to the copper plates ', 2.2' will not dig into each other, and various problems associated with this will not occur. The mold is expanded by the bulging force, and as a result, a gap is created between the long side mold 1.1' and the short side mold 2, 2', which poses a problem that hinders the casting operation.

Furthermore, in the fastening device shown in FIG.
Since there is no mechanism for adjusting only the elastic force of 0 and 23, it is necessary to always adjust the clamping force of the long side molds 1 and 1' to the appropriate level in response to changes in casting conditions such as the width of the slab. In addition, since the spring mechanism is provided on the outer wall surface of both long-side molds 1 and 1', it is necessary to assemble the molds as well as the springs 20, 23 or the like. There are also problems in that it takes a lot of time and effort to set up the mechanism.

Further, the fastening device shown in FIG. 5 has a spring 20 as described above.
, 23, the spring 2 has an elastic force greater than the bulging force of the molten steel when the copper plate of the short side mold 2゜2' thermally expands.
30 elastic force acts as a clamping force on the long side molds 1, 1', and as a result, the frictional resistance between the long side molds 1, 1' and the short side molds 2, 2' increases, and the As a result, it becomes difficult to move the short-side molds 2, 2' in order to change the width of the slab, and the width changing device for moving the short-side molds 2, 2' must be large and large-capacity. There were problems such as not being able to do so.

The object of the present invention is to provide a mold fastening device for a continuous casting machine that can advantageously solve the above problems.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 6. One of the long-side molds 1 and 1', which are disposed opposite to each other with the short-side mold 2 sandwiched therebetween, has a base end portion of a fastening rod 30. Ga Natsu 3
1, and the tip of the rod 30 penetrates the other long side mold 1 and projects toward the outer wall surface thereof,
A nut 32 as an adjustment member is screwed into the middle of the protruding portion, and a first spring mechanism 33 is disposed between the nut 32 and the outer wall surface of the other long side mold 1. There is.

This spring mechanism 33 includes a spring receiving plate 3 that loosely fits into the rod 30.
4 is placed along the outer wall surface of the long-side mold 1, and a spring holding plate 35 facing the spring receiving plate 34 is loosely fitted onto the rod 30 on the front side of the nut 32 (on the left side in FIG. 6). A disc spring 36 is interposed between the spring receiving plate 34 and the spring holding plate 35, and a reaction force setting bolt 37 is screwed into the spring holding plate 34 through the spring holding plate 35. Therefore, by tightening the reaction force setting bolt 37 in advance, the disc spring 36 is compressed so that its elastic force is greater than the bulging force caused by the molten metal (and a steel plate (not shown) provided on the inner surface of the short side mold 2). The pressure is preferably set to 1.1 to 2.5 times the pressure of the molten metal so that it is smaller than the thermal expansion force of the molten metal, and in that state, as shown in FIG. Then, by loosening the reaction force setting bolt 37 with the nut 32 in contact with the rear surface of the spring holding plate 35, the other long side mold 1 is moved to one side by the elastic force set as described above. long side mold 1
′.

Further, a male threaded portion is formed on the outer peripheral surface of the spring receiving plate 34, and the base end portion of a cylindrical pusher 38 is screwed onto the outer peripheral surface of the spring receiving plate 34 so as to be able to adjust the position back and forth, and is loosened by an annular locking nut 39. It's stopped.

Furthermore, a fixing member is attached to the tip of the rod 30.
A double nut 40 is screwed on, and a second spring mechanism 41 is disposed between the double nut 40 and the nut 32.

This spring mechanism 41 has a spring receiving plate 42 that is loosely fitted into the iron 30 on the rear side of the nut 32 (on the right side in FIG. 6), and a rod on the front side of the double nut 40 (on the left side in FIG. 6). A spring holding plate 43 is loosely fitted to the spring holding plate 43 , and a disc spring 4 is disposed between the spring receiving plate 42 and the spring holding plate 43 .
4 is interposed, and the reaction force setting bolt 45 is attached to the spring holding plate 4.
3 is screwed through the spring receiving plate 42, and by tightening the reaction force setting bolt 45 in advance, the disc spring 44 is compressed and its elastic force is applied to the disc spring 36 of the first spring mechanism 33. The elastic force is set to be greater than the elastic force, preferably 5 to 10 times the pressure of the molten metal, and in that state, as shown in FIG. 6, the rod 30 is fitted and set at the desired position, and the double By loosening the reaction force setting bolt 45 with the nut 40 in contact with the rear surface of the spring holding plate 43, the elastic force of the disc spring 44 is supported by each of the nuts 32 and 40.

Further, a male threaded portion is formed on the outer circumferential surface of the spring holding plate 43, and a cylindrical stopper 46 is screwed onto the tip thereof so as to be adjustable in its forward and backward position, and an annular locking nut 47 is used to loosen the screw. It's stopped.

Note that the tip of the pusher 38 and the second spring mechanism 4
The spacing δ2 with respect to the spring receiving plate 42 constituting the short-side mold 2 is to allow displacement of the long-side mold 1 due to thermal expansion of the copper plate of the short-side mold 2. It is preferable to correspond to the amount of thermal expansion, and more specifically, it is preferable to set the size to about 1/200 of the thickness of the slab or less.

Further, a spring receiving plate 42 constituting the second spring mechanism 41
The distance δ3 between the end of the stopper 46 and the end of the stopper 46 prevents the long-side mold 1 from moving backward against the elastic force of the disc spring 440 in the second spring mechanism 41 when inspecting or cleaning the copper plate on the inner surface of the mold. Specifically, it is preferable that the interval δ3 is two or more times.

Further, a frame body 48 that surrounds the first and second spring mechanisms 33, 41 is protruded from the outer wall surface of the other long side mold 1, and a cylinder 49 and a cylinder 48 are provided at the distal ends thereof.
9. A mold separating device 51 is installed which includes a piston 50 that is operated by supplied pressure oil and presses the rod 30 in its axial direction.

In the fastening device configured as described above, the long-side molds 1 and 1' are normally tightened by the disc spring 36 of the first spring mechanism 33 to sandwich the short-side mold 2, but the disc spring As mentioned above, the 360 elastic force is larger than the pressure of the molten metal acting on the long side mold 1 (and is set smaller than the thermal expansion force of the copper plate attached to the short side mold 2), so the This prevents the long side mold 1 from moving backward when pouring the metal, thereby creating a gap between it and the short side mold 2 (also, when the copper plate attached to the short side mold 2 thermally expands) The long-side mold 1 moves backward due to the expansion force, and as a result, the copper plates of the molds 1, 1' and 2 do not bite into each other, and since the elastic force of the disc spring 36 is small, Frictional resistance between the molds 1 and 2 becomes smaller.

Therefore, when moving the short side mold 2 in order to change the width of the slab, there is no need for the operator to temporarily retreat the long side mold 1 unlike in conventional fastening devices, which reduces the burden on the operator. In addition, there is no possibility of erroneous operation or damage to the width changing device, and since the frictional resistance is small, the width changing device can be made small and small in capacity.

As a result of thermal expansion of the copper plate of the short side mold 2, when the long side mold 1 moves backward and the tip of the pusher 38 comes into contact with the spring receiving plate 42 of the second spring mechanism 41, the long side mold 1 Mold 1
The elastic force of the second spring mechanism 410 and the disc spring 44 will act against the further backward movement of the disc spring 440, but the elastic force of the disc spring 440 is considerably thick (as described above). Therefore, even if an abnormal force that may occur during the casting operation is applied to the long side mold 1, the long side mold 1 will move backward and a gap will be created between it and the short side mold 2. There isn't.

On the other hand, when inspecting or cleaning the copper plate on the inner surface of the mold, if pressure oil is supplied into the cylinder 49 of the mold separating device 51, the piston 50 is in contact with the rod 30, and the rod 3
0, the long side mold 1 is pulled to the right in FIG. 6 via the frame 48, and the pusher 38 and the spring receiving plate 42 of the second spring mechanism the spacing δ2 between the spring receiving plate 42 and the collar 46;
The long side mold 1 is moved backward until the distance δ3 between the molds becomes zero, and the clearance required for inspection and cleaning of the copper plate on the inner surface of the mold can be automatically set. It will also be possible to bring it online.

As mentioned above, the distance δ2 between the plusher 38 and the spring receiving plate 42 of the second spring mechanism 41 is set equal to the amount of thermal expansion of the copper plate of the short side mold 2. The amount of thermal expansion varies depending on the temperature, the width of the copper plate, etc.
Since the pusher 38 is screwed onto the spring receiving plate 39 of the first spring mechanism 33 so that its position can be adjusted back and forth, the above-mentioned interval δ
2 can be easily and simply set to the required dimensions.

Further, the distance δ3 between the spring receiving plate 42 of the second spring mechanism 41 and the stopper 46 can be adjusted by adjusting the stopper 46 back and forth, since the stopper 46 is screwed onto the spring holding plate 43 so that its position can be adjusted back and forth. This allows it to be easily and simply set to the required dimensions.

Furthermore, the elastic force of the first spring mechanism 330 and the disc spring 360 has a lower limit value and an upper limit value as described above, but these limit values may vary depending on the capacity of the mold itself, the width of the short side mold 20, etc. However, the nut 32 as an adjusting member
By tightening or loosening the elastic force of the disc spring 360, the elastic force of the disc spring 360 can be easily set within each limit value.

Note that by tightening or loosening the nut 32, the above-mentioned intervals δ2 and δ3 will change, but by rotating the pusher 38 and the stopper 46, the intervals δ2 and δ3 can be easily adjusted to the desired dimensions. Can be set to .

In addition, although only one fastening device was shown in the above example,
Practically speaking, it is preferable to provide the above-mentioned fastening devices at a total of four locations on the top, bottom, left and right of the long-side mold 1.

Furthermore, as is clear from the above configuration, since the above-described fastening device uses the elastic force of the springs 36 and 44 to tighten the respective long-side molds 1 and 1', the deviated portions of the long-side mold 1 If a load is applied to the long-side molds 1, 1', there is a risk that the long-side molds 1, 1' may be tilted relative to each other, but in order to avoid such a situation, each long-side mold 1, 1' should be placed with an appropriate guide. They may be connected via arms so that they can approach and separate, so that the long side molds 1, 1' are always parallel to each other.

In this invention, the long-side molds 1 and 1' are a general term for a back plate and a mold provided on its inner surface and having a water passage, and therefore, the fastening rod 30 in this invention is inserted between each bank plate. It may be constructed.

As is clear from the above description, according to the mold fastening device of the continuous casting machine of the present invention, the force that clamps the long side mold and pinches the short side mold is possible within the range that does not create a gap between these molds. Even if the copper plate on the inner surface of the short-side mold expands thermally, it will not bite into the copper plate of the long-side mold, so there is resistance to movement of the short-side mold to change the width of the slab. The overall force is smaller, and as a result, it is no longer necessary for the operator to move the long-side mold backwards before moving the short-side mold, which reduces the burden on the operator and prevents misoperation. In addition, the width changing device for moving the short side mold can be made small and small in capacity.

In addition, by operating the mold separation device, the longer side mold is moved backwards and the clearance required for inspection and cleaning of the copper plate inside the mold can be set, so inspection and cleaning of the copper plate can also be done online. Furthermore, since the first and second spring mechanisms are provided at one end of the fastening rod, it is possible to easily assemble the mold and set the spring mechanism. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram partially showing a state in which molten steel has entered the gap between the long side mold and the short side mold, Fig. 2 is a schematic plan view showing an example of a conventional fastening device, and Fig. 3 The figure is a schematic plan view showing another example of a conventional fastening device, FIG. 4 is a schematic diagram partially showing a state in which a copper plate is bitten, and FIG. 5 is a schematic diagram showing still another example of a conventional fastening device. The plan view and FIG. 6 are cross-sectional plan views showing one embodiment of the present invention. 1.1'... Long side mold, 2,2'... Short side mold, 30... Fastening rod, 32... Nut, 33...
・First spring mechanism, 40...double nut, 41...
Second spring mechanism, 51...mold separating device.

Claims (1)

[Claims] 1. By sandwiching a pair of short side molds between a pair of long side molds, these molds are combined into a rectangular shape, and by moving the short side molds closer to each other and away from each other, the width of the slab is changed. In the mold of the continuous casting machine, the tip of the fastening rod fixed to one long-side mold is made to protrude through the other long-side mold, and an adjustment member is provided in the middle of the protruding part. At the same time, an elastic force is created between the adjusting member and the outer wall surface of the other long-side mold, which is greater than the pressure caused by the molten metal and smaller than the thermal expansion force of the copper plate provided on the inner surface of the short-side mold. A first spring mechanism is compressed and disposed, and a fixing member is attached to the distal end of the fastening rod, and a small A second spring mechanism having an elastic force greater than the elastic force of A mold spacing device is provided to separate the two molds from each other by a certain distance, and as the other long side mold moves backward, the first spring mechanism is compressed by a certain dimension, thereby causing the second spring mechanism to move. A mold fastening device for a continuous casting machine, characterized in that the elastic force starts acting as a fastening force on the long side mold.