JPS6230860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides continuous casting using a continuous casting machine, particularly a mold having a trapezoidal casting space in horizontal cross section, and a curved continuous casting method using the above-mentioned molds having different trapezoidal degrees depending on the casting width. This relates to a short side support device for a slab in a machine.

In order to obtain a slab having a rectangular cross-sectional shape as shown in FIG. 3 at the bend straightening completion point 3 of the slab 2 in the curved continuous casting machine 1 shown in FIG. The use of a so-called trapezoidal mold 4 having a trapezoidal shape as shown in the figure is known from Japanese Patent Publication No. 8481/1983.

In detail, for example, as shown in FIG. 2, the long side mold piece 5,
Using a trapezoidal mold 4 in which the inner surfaces of the short side mold pieces 7 and 8 arranged between 6 and 6 are tapered surfaces 9 and 10, the width of the slab surface 11 to which compressive force is applied in the drawing direction of the slab 2 during bend straightening is By casting a slab 2 with a trapezoidal cross-sectional shape that is smaller than the width of the slab surface 12 to which force is applied, a slab with a rectangular cross-sectional shape is created by increasing the width due to compressive force during the bending straightening process and/or decreasing the width due to tensile force. That is.

Now, when the length l _F of the long side mold piece 5 on the inner surface of the _trapezoidal mold 4 and the length _{l L} of the long side mold piece 6 shown in FIG. When defined as a trapezoidal degree of , the guide profile of the slab 2 is fixed from directly below the mold 4 to the point 3 where the bending straightening is completed. In a curved continuous casting machine, when the casting speed is constant, the trapezoidity required to obtain a rectangular cross-sectional slab with a thickness t at the straightening completion point 3 is determined by the casting width [(l _L +l
It is also stated in Japanese Patent Publication No. 44-8481 that the trapezoidity must be increased as the casting width becomes larger depending on the following: _F )/2]. Therefore, in order to obtain slabs with a plurality of different widths and a rectangular cross section using a curved continuous casting machine with a fixed slab guide profile, the casting width [(l _L +l _F )/2] and the trapezoidity [( _It is necessary to prepare _a plurality of different trapezoidal molds in advance and exchange the trapezoidal molds as necessary for casting.

Generally, the short sides of the slab pulled out of the mold are supported by multiple rollers in the slab pulling direction of a slab short side support device installed directly below the mold to prevent short side bulging of the slab. , preventing breakout.

Therefore, in a curved continuous casting machine that uses a mold having a casting space whose horizontal cross section is trapezoidal and has different degrees of trapezoidity depending on the casting width, the mold of the casting machine is When changing to a different mold, it is necessary to adjust the position of the roller of the slab short side support device in the slab width direction and adjust the angle of the roller axis so that the roller surface comes into close contact with the slab short side surface.

The present invention can be used to support the short sides of a plurality of slabs with different trapezoidal degrees, and by simply positioning the roller in the width direction of the slab, the angle of the roller axis is adjusted by the trapezoidal slab pulled out from the trapezoidal mold. Provided is a slab short side support device that is automatically adjusted,
The gist is that in a curved continuous casting machine that uses a mold having a trapezoidal casting space with a trapezoidal horizontal cross section and a mold with a different degree of trapezoidality depending on the casting width, both lengths of the slab drawn from the mold are used. Short side support is made by installing a roller support frame on a movable frame that can freely move forward and backward toward the short side of the slab between the long side support rolls that support each side, and a sleeve attached to the central shaft. Both ends of the central axis of the roller are supported by the spherical recess of the roller support frame,
After positioning the short side support rollers in the slab width direction by moving the moving frame, the angle of the short side support rollers is automatically adjusted by the bottom part of the trapezoidal slab that is pulled out of the trapezoidal mold. There is provided a short side support device for a slab in a curved continuous casting machine, which is characterized by:

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the short side support device of the present invention will be described below with reference to the drawings.

Figure 4 is an overall plan view of the slab short side support device, Figure 5
The figure is a front view of the short side support device for the cast strip, and FIG. 6 is a side view of the short side support device for the cast strip. In the drawings, 13
is a long side support roll that supports both long side surfaces of a slab drawn from a mold having a trapezoidal horizontal cross section. This support roll 13 is supported by a segment frame 14, and a pair of opposing segment frames 14, 14 (only one 14 is shown in the figure)
Between the support rolls 13-13 of both segments (fifth
As shown in the figure, the rollers are connected by a support roll column 15 with an interval corresponding to the thickness of the slab.

16, 16 are sliding bearings fixed on the segment frames 14 on the sides of the support roll columns 15, 15, and 17 is a rod supported by the sliding bearings 16 so as to be movable back and forth in the axial direction of the support roll 13. be.
18 is connected to the sliding bearing 16 and the rod 1
19 is a hydraulic or electric cylinder fixed to the rear end of the case 18. 20 is a joint provided at the tip of the cylinder rod 21 of the cylinder 19, and 22 is a connecting shaft connecting the joint 20 and the rod 17. 2
3 is a moving frame provided with joints 24, 24 on the rear surface 23a. a joint 24 of the moving frame 23;
24 and the tips of the rods 17, 17 are connected by connecting shafts 25, 25, and the moving frame 2
3 is moved back and forth with respect to the short side of the slab between support rolls 13-13 that support both long side surfaces of the slab pulled out from the mold by the forward and backward movement of the cylinders 19,19.

Reference numeral 26 denotes short side support rollers provided at six locations at predetermined intervals in the longitudinal direction of the front surface 23b of the movable frame 23. Referring to FIG. 6, each support roller 26 is mounted and supported on a roller support frame 27 that is removably installed on the front surface 23b of the moving frame 23. As shown in FIG. The roller support frame 27 has a sixth
As shown in the figure, it is a groove-shaped frame and its bottom 2
A rod 29 is protruded from the center of 8, and the rod 29
A groove 31 is formed in the center of the movable frame 23 in which the roller support frame 27 is installed, and a groove 31 is formed in the bottom 32 of the groove 31 to accommodate the roller support frame 27. A through hole 33 is formed through which the 27 rods 29 pass, and further, through holes 34 are formed on both outer sides of the groove 31.

The roller support frame 27 is installed on the moving frame 23 through the screw hole 3 through the through hole 34.
It is connected by a bolt 35 screwed into the
At this time, the disc spring 36 inserted into the rod 29 is
Bottom surface 28 of frame 27 and groove 3 of frame 23
interposed in a compressed state between the bottom part 32 of 1,
In addition, a gap g is formed between the bottom surface 28 of the roller support frame 27 and the front surface 23b of the frame 23, so that when a force greater than the spring force of the disc spring 32 in the compressed state is applied to the roller support frame 27, The roller support frame 27 is attached to the front surface 2 of the frame 23.
It is installed so that it can be retreated up to 3b.

Furthermore, an inner surface of one of the flange portions 37, 37 of the roller support frame 27 has an R
A block 39 has a slit (cut spherical recess) 38 formed therein, and an R slit 38' having the same shape and size as the R slit 38 on the inner surface of the other flange part.
is removably fixed with bolts 40.

Both R slits 38, 38' face each other.

The short side support roller 26 has a structure in which a sleeve 42 is attached to a central shaft 41 via a metal ring 43, and the sleeve 42 and the central shaft 41 are relatively rotatable. At both ends of the central shaft 41, which are located outside both end surfaces of the sleeve 42, protrusions 44 having a thickness that can be inserted into the R slits 38, 38' are respectively formed. The same R as the R surface of 38'
It's becoming a face. The R surfaces of both projections 44 are slidably supported by the R surfaces of both R slits 38, 38'. Therefore the sleeve 42 of the roller 26
is rotatable and can freely rotate about a straight line perpendicular to the center of gravity of the roller 26, that is, point a on the axis 45 in the figure.

Next, the adjustment operation of the slab short side support device configured as described above will be described.

First, when changing the casting width, remove the old mold from the continuous casting machine, install the new mold, and drive the cylinders 19, 19 back and forth to control the roller 26.
Positioning in the width direction is performed. At this time, the roller 26
The angle of the axis 45 is such that the surface of the roller 26 comes into close contact with the short side surface of the slab with a trapezoidal cross section that has been pulled out from the old mold. Next, the sufficiently cooled slab bottom part connected to the dummy bar head from the new mold passes through the slab short side support device. At this time, since the horizontal cross section of the bottom part of the slab has a trapezoidal shape, which is formed by shaving the trapezoidal shape of the new mold, this bottom part passes through each of the rollers 26 of the short side support device of the slab. At times, the roller axis 45 of the roller 26 is rotated until the surface of the roller 26 comes into close contact with the short side surface of the bottom portion, and then stopped. In this way, the angle of the roller 26 is automatically adjusted by passing the bottom portion of the slab.

When the middle part of the slab following the bottom part of the slab passes, the angle of the rotating shaft of the short side support roller 26 of the short side supporting device of the slab with respect to the rotating axis of the long side supporting roll is set to the trapezoidal shape of the new mold. The angle of the short side of the slab relative to the long side of the slab is maintained at an angle determined by the angle of the short side of the slab, which effectively prevents bulging on the short side of the slab and also effectively prevents breakout due to short side bulging.

In FIGS. 4 and 5, reference numeral 46 indicates an air/water injection nozzle provided between the rollers 26 and 26 of the movable frame 23, 47 indicates a gas supply pipe, and 48 indicates a water supply pipe.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a curved continuous casting machine, Figs. 2 and 3 are sectional views taken along A-A and B-B in Fig. 1, and Figs. 4, 5, and 6 are short side supports of the cast slab according to the present invention. FIG. 4 is a plan view showing the entire device, FIG. 5 is a front view of the device, and FIG. 6 is a side view of the device. 1... Curved continuous casting machine, 2... Slab, 3...
Bending correction completion point, 4... Mold, 5... Long side mold piece, 6... Long side mold piece, 7... Short side mold piece, 8...
... Short side mold piece, 9 ... Tapered surface, 10 ... Tapered surface, 11 ... Long side surface of slab, 12 ... Long side surface of slab, 13 ... Long side support roll, 14 ... Segment frame, 15 ...Support roll column, 16
... Sliding bearing, 17 ... Rod, 18 ... Rod case, 19 ... Cylinder, 20 ... Joint, 2
1...Cylinder rod, 22...Connection shaft, 23
...Moving frame, 24...Joint, 25...Connection shaft, 26...Short side support roller, 27...Roller support frame, 28...Bottom surface of frame 27, 2
9... Rod, 30... Screw hole, 31... Groove, 3
2...Bottom surface of groove 31, 33...Through hole, 34...
Through hole bolt hole, 35...bolt, 36...disc spring, 37...flange part, 38...R slit,
39...Block, 40...Bolt, 41...Center shaft, 42...Sleeve, 43...Metal ring, 44...Protrusion, 45...Roller axis line, 46
... Air water injection nozzle.

Claims (1)

[Scope of Claims] 1. In a curved continuous casting machine using a mold having a casting space with a trapezoidal horizontal cross section and having a different degree of trapezoidity depending on the casting width, a slab drawn from the mold. A roller support frame is provided on a movable frame that can move forward and backward toward the short side of the slab between the long side support rolls that support both long sides of the slab, and a sleeve is attached to the central shaft. Both ends of the center axis of the side support roller are supported by the spherical recesses of the roller support frame, and the platform is pulled out from the trapezoidal mold after positioning of the short side support roller in the slab width direction by movement of the movable frame. 1. A short side support device for a cast slab in a curved continuous casting machine, characterized in that the angle of a short side support roller is automatically adjusted by the bottom part of a shaped slab.