JPH0120049Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold structure in which a supporting movement device for the shorter sides of the mold is improved when a water-cooled mold in continuous casting equipment is made into a variable-width mold.

Figure 1 shows the arrangement of the long sides and short sides constituting this type of variable width mold, which are mutually restrained and tapered or curved downward at a constant interval W in the longitudinal direction. A pair of mold short sides 2, 2, which maintain a slight gap from the mold long side surface between a pair of mold long sides 1, 1, are supported by short side support rods 3, 3 and move toward or away from each other. The width B of the slab A having a square cross section can be changed by changing the width B of the slab A having a rectangular cross section. FIG. 2 shows a longitudinal sectional front view of a conventional mold short side support device, in which each mold short side 2 is supported horizontally movably in parallel by pushers 5a, 5b of a frame 4 at the top and bottom of the outside. The short side support rods 3a and 3b are driven individually via feed screws 7a and 7b and worm reducers 8a and 8b to move the short side of the mold to an arbitrary position. It's getting old. The purpose of supporting the short side 2 of the mold above and below is to maintain the gap between the long side of the mold and the specified value, and also to accommodate the solidification process of the casting meniscus in the mold when shortening the slab width during casting. Place the lower part of the short side of the mold on the lower short side support rod 3.
This is to perform operations such as moving the mold forward in advance as shown by the chain line by b and moving the upper part of the short side of the mold to follow.

This conventional mold short side supporting device has sufficient rigidity because the short side of the mold is usually clamped by the long side of the mold after the width of the slab is set. However, since this clamp is released during automatic width change during casting, the short side of the mold is supported on a cantilever, which causes various problems, especially when it is desired to increase the movement stroke of the short side of the mold.

In other words, when changing the width during casting, the mold short side 2
is subjected to deformation resistance from the slab and static pressure of the molten slab as shown by arrow F, and the mold is vibrated in the vertical direction V by the mold vibration device. The force of the expression acts. {(Slab deformation resistance) + (Slab molten steel static pressure)} x (Friction coefficient between mold short side and slab surface) + (Mold short side weight) This large vertical force acting on mold short side 2 Since the short side support rods 3a, 3b are bent by the short side support rods 3a, 3b, one countermeasure is to make the rods 3a, 3b have large cross-sections with high rigidity, but this alone is insufficient and the rods 3a, 3b and the push rods are bent. 5
Since there is a gap or backlash in the fitting part between the rods 3a and 5b, the short side 2 of the mold in a freely supported state vibrates up and down, and if the stroke of the support rods 3a and 3b is increased, the deflection will increase. remains unresolved.

The present invention was made to solve the above-mentioned problem of the short side support rod being bent when changing the width during casting or when increasing the movement stroke of the short side of the mold in a variable width mold for continuous casting.
A short side support plate is provided that is guided by a guide plate provided on the long side over the position change range of the short side of the mold, and the short side of the mold is connected to the short side support plate with a pin to prevent the above-mentioned large force applied from the slab when the short side of the mold is moved. The force is supported by the guide plate via the short side support plate, and the deflection force applied to the short side support rod is eliminated or reduced.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 3 shows a longitudinal sectional front view of a variable width mold according to an embodiment of the present invention, and FIG. 4 shows a longitudinal sectional side view thereof. A pair of mold short sides 2, 2 is provided between a pair of mold long sides 1, 1 so as to be movable in the longitudinal direction of the mold long side 1.
In this example, a pair of mold long sides 1, 1 have a guide plate 1 having guide grooves 9, 9 with opposing concave sections on the upper surface.
0 and 10, and a guide block, that is, a short side support plate 12 having convex edges 11, 11 at both ends that fit into the guide grooves 9, 9 is fitted so as to be movable in the longitudinal direction of the guide plates 10, 10. Then, the short side support plate 12 and the mold short side 2 are connected by pins 13. This structure can be provided on both mold short sides.

In order to move the mold short side 2, pins 6 are attached to the ends of short side support rods 3a and 3b which are supported parallel to the pushers 5a and 5b of the frame 4 at the top and bottom of the outside.
a, 6b, each short side support rod 3a,
3b can be driven via feed screws 7a, 7b and worm reducers 8a, 8b to be individually movable, which can be the same as the conventional structure shown in FIG. Advantageously, pin 13 is provided above pin 6a.

According to the device of the present invention having the above configuration, the mold short side 2 is connected to the short side support plate 12 via the pin 13, and the short side support plate 12 is connected to the guide plate 10 installed on the upper surface of the mold long side 1 to guide the concave side. Since it is supported slidably in the mold width direction via the groove 9 and restrained in the flow direction C of the slab A, even if the width is changed during casting, the short piece support rods 3a, Since no bending force acts on 3b, the problem of deflection of the short side support rod is solved. Short side support rod 3
Since it is not necessary to make a and 3b larger than necessary to make them strong and rigid, it is now possible to manufacture a variable width mold with a large stroke. Furthermore, since the mold short side 2 and the short side support plate 12 are connected via the pin 13, the widthwise taper amount D can be freely set when changing the width during casting, as shown in FIG. It is possible.

As described above, according to the present invention, by adding a small amount of equipment to a variable width mold for continuous casting, there is no need to increase the size of the support rod device for the short side of the mold, and the movement stroke of the short side of the mold can be increased. There are effects such as improved functions such as being able to increase the amount of taper in the width direction.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a variable width mold, FIG. 2 is a longitudinal sectional front view of a variable width mold including a conventional mold short side support and movement device, and FIG. 3 is a schematic plan view of a variable width mold according to an embodiment of the present invention. 4 is a vertical sectional front view taken along the line in FIG. 4, FIG. 4 is a vertical sectional side view taken along the line 3 in FIG. 3, and FIG. 1... Long side of the mold, 2... Short side of the mold, 3, 3a,
3b...Short side support rod, 4...Frame, 5
a, 5b...Push, 6a, 6b, 13...Pin, 7a, 7b...Feed screw, 8a, 8b...Worm reducer, 9...Guide groove, 10...Guide plate, 11...Convex shape Edge, 12...Short side support plate, A...
...Slab, B... Width, C... Slab flow direction, D...
Amount of taper in the width direction, W: distance between long sides of the mold, F: force acting on the slab, V: vibration direction.

Claims (1)

[Scope of utility model registration request] In a variable width mold for continuous casting, a pair of guide plates are provided opposite to the long sides of the mold, and a short side support plate is provided that moves along the longitudinal direction by fitting a concave groove and a convex ridge. A mold structure characterized by connecting the short sides of the mold with pins.