RU2273544C1 - Mold of billet continuous casting machine - Google Patents

Abstract

FIELD: metallurgy, namely billet continuous casting machines.

SUBSTANCE: mold of machine for continuous casting of billets includes wide walls forced together through narrow walls arranged between them by means of springs, hydraulic cylinders and braces placed at outer side of one of wide walls. Walls are mounted in rigid outer framework. In openings of one side of rigid outer framework hydraulic cylinders with braces and springs are mounted. Wide wall of mold arranged at opposite side of wide wall forced by means of hydraulic cylinder rests upon other inner side of outer framework. Springs are mounted in cavity of each hydraulic cylinder between rod and housing. There is through axial opening in rod of each hydraulic cylinder; brace is arranged in said opening. Brace is in the form of pressure screw and it is arranged in threaded through axial opening of rod. Units for fixing screws and wide wall are placed in tail portion of several pressure screws. Nut is screwed on rod outside housing of each hydraulic cylinder. Fixing unit may be in the form of C-shaped vertical guide secured to wide wall and supporting stop for tail portion of pressure screw.

EFFECT: enhanced operational characteristics of mold, simplified condition for maintaining it in machines for continuous casting of blooms.

3 cl, 4 dwg

Description

The invention relates to metallurgy, in particular to continuous casting machines.

Known mold continuous casting machine according to patent EP 920937 (publ. 09.06.99), containing wide walls and clamped between them and offset relative to each other in order to adjust the width of the format narrow walls. To ensure controlled movement and clamping force, the crystallizer unit mounted in a rigid outer frame is equipped with hydraulic cylinders. The wide walls are centered inside a rigid outer frame.

The known mold is essentially a mold of a continuous slab casting machine. The use of continuous operation of hydraulic cylinders in it is due to the need to change the working force of compression of the wall pack when changing the width of the slab during casting. Given the casting of the melts in series in the known mold, the hydraulic cylinders continuously operate for several days, which negatively affects their work. In the proposed mold, the format of the cast ingots during casting does not change, but it is necessary to increase the resistance of the walls, which depends on the flow of liquid metal into the joints between wide and narrow walls. In this connection, before the walls of the mold are completely warmed up, an increase in the working force of compression of these walls is required. After that, the casting can be continued with less effort to compress the walls, which is feasible with pre-compressed springs.

A known mold according to the patent of the Russian Federation No. 2015819 (publ. 15.07.94). This mold contains wide walls, pulled together through narrow walls installed between them by means of springs, hydraulic cylinders and couplers, springs are installed on one end of each coupler, hydraulic cylinders on the opposite, and springs and hydraulic cylinders are located on the outside of each wide wall, and in the rod of each hydraulic cylinder a through hole is made in which the screed is located.

In this mold, which is closest in technical essence to the proposed one, the arrangement of hydraulic cylinders and springs on the outside of each wide wall is not possible when casting blooms on multi-strand machines due to the limited space between the streams.

The present invention solves the problem of improving the health of the mold and the conditions of its service in continuous casting machines blooms.

To achieve this technical result, in the mold of the continuous casting machine containing wide walls, compressed between themselves through the narrow walls installed between them by means of springs, hydraulic cylinders and couplers, springs and hydraulic cylinders are located on the outside of one of the wide walls, and in the rod of each hydraulic cylinder a through axial hole in which the screed is located, while the mold is equipped with a rigid outer frame, in the openings of one of the sides of which hydraulic cylinders are installed with the wide mold wall located on the opposite side of the wide wall pressed by the hydraulic cylinders, and the springs are placed in the cavity of each hydraulic cylinder between the rod and the housing, and the screed is made in the form of a pressure screw and is located on the other inner side of the outer frame in the threaded through axial hole of the rod, and on the tail of some pressure screws are fixed nodes for fixing screws and a wide wall, and on the rod outside the body of each hydraulic cylinder is screwed and the nut. The fixation unit is a C-shaped vertical guide mounted on a wide wall, and the stop of the tail of the pressure screw mounted in it.

Distinctive features of the proposed mold of the continuous casting machine from the above known, closest to it, is the presence of a rigid outer frame, in the openings of one of the sides of which hydraulic cylinders with couplers and springs are installed, and a wide crystallizer wall located on the other inner side of the outer frame is located opposite side of the wide wall, preloaded by hydraulic cylinders, in addition, the springs are placed in the cavity of each hydraulic cylinder between the rod and the housing, and the coupler The ka is made in the form of a pressure screw and is located in a threaded through axial hole of the rod, and on the rear part of some pressure screws the fixing units for screws and a wide wall are installed, and a nut is screwed on the rod outside the body of each hydraulic cylinder. The fixation unit is a C-shaped vertical guide mounted on a wide wall, and the stop of the tail of the pressure screw mounted in it.

Due to the presence of these signs, the compression of the walls of the mold is performed by squeezing one of the wide walls from a rigid outer frame. As a result, the entire mechanism of preloading the walls is located on one side, which allows it to be used in multi-strand continuous casting machines of blooms.

The walls of the mold, which are worn out from the inside, are replaced in the mold without dismantling the preload nodes of the wide and narrow walls that remain in the rigid outer frame. The preload nodes are necessary to provide mechanized removal of the pressure screw with a wide wall when dismantling narrow walls.

The proposed design of the pressure device allows the preliminary compression of the springs to a predetermined force outside the mold, and in the mold itself, only the force is transmitted to the package of working walls.

In addition, hydraulic cylinders operate only until the crystallizer walls are completely warmed up in order to increase the magnitude of the working compression force of these walls. After that, the casting is continued with a smaller force of compression of the walls, which is carried out by pre-compressed springs.

Below is an embodiment of the invention, not excluding other options within the claims, with reference to the drawings shown in figures 1-4.

Figure 1 shows a top view of the mold;

figure 2 is the same, a longitudinal section along aa;

figure 3 is the same, a section along BB;

figure 4 is the same, a section along BB.

The mold of the continuous casting machine comprises two cooled wide walls 1 and 2 located opposite each other, made in the form of support frames and equipped with copper plates 3. Between them are cooled narrow walls 4, also equipped with copper plates 5, and nodes of movement 6 of narrow walls along relation to each other. The wide and narrow walls are located inside the rigid outer frame 7. The wide wall 1 is supported on the inner surface of one of the sides of the outer frame 7, and the wide wall 2 is supported by six plunger hydraulic cylinders 8. Each hydraulic cylinder 8 includes a housing 9, a rod with a piston 10. The piston of the hydraulic cylinder is made at the same time with the rod 10, outside the outer frame 7. In the cavity of the hydraulic cylinder between the rod 10 and the housing 9 is placed a compression spring 11. To preload the spring at the outer end of the rod 10 is installed nut 12. The housing 9 of the hydraulic cylinder made in the form of a support cup and installed in the hole of the outer frame 7. In the rod 10 of the hydraulic cylinder there is a through axial hole, the parts of which are threaded and the screw screw 13 is screwed. Fixation assemblies are installed on the tail of the upper and lower pressure screws 14. The fixation unit is a A C-shaped vertical guide 15, mounted on a wide wall 2, and a stop 16 of the tail of the pressure screw 13 mounted therein.

To exclude the rotation of the piston rod 10 relative to the housing 9 during rotation of the pressure screw 12, a pin 17 is installed in the housing, which enters the groove of the piston 10.

Preparation for operation of the mold continuous casting machine is as follows.

Inside the rigid outer frame 7, narrow 4 and wide 1, 2 walls with copper plates are wound up, and assembled movement nodes 6 narrow walls and wide wall preload units consisting of hydraulic cylinders 8, pressure screws 13 and springs 11 are installed in the holes of the frame walls.

When the pressure screw 13 is rotated, it extends from the rod 10 of the hydraulic cylinder 8 as far as the stop into the wide wall 2. The rotation continues until a gap “f” is formed between the nut 12 and the cylinder body 9. This indicates the transfer of force from the spring 11 to the walls 1, 2 and clamping between them narrow walls 4.

The removal of the wide walls 1, 2 from the narrow walls 4 is carried out by rotating the pressure screw 13 in the opposite direction.

The work of the mold CCM is as follows.

Before casting, the working fluid is supplied under pressure to the hydraulic cylinders 5, which allows to increase the compression force of the wide walls 1, 2 to maximize the selection of the gaps in their junction with the narrow walls 4. After heating the working walls, i.e. 3 ... 5 min after the liquid metal enters the mold, the pressure in the hydraulic cylinder is reset to zero, and then, during the entire casting, the package of working walls is compressed only by the force of pre-compressed springs 11.

The wall preload mechanism is located on one side, which makes it possible to use it in multi-strand continuous casting machines of blooms.

The walls of the mold, wearing out from the inside, are replaced without dismantling the nodes of the preload of the wide and narrow walls that remain in the rigid outer frame.

Thus, hydraulic cylinders increase the compression force of wide walls to maximize the selection of gaps at their junction with narrow walls only in the initial casting period.

Claims (2)

1. The mold of the continuous casting machine, containing wide walls, compressed between each other through the narrow walls installed between them by means of springs, hydraulic cylinders and couplers, while the springs and hydraulic cylinders are located on the outside of one of the wide walls, and a through axial shaft is made in the rod of each hydraulic cylinder the hole in which the screed is located, characterized in that the mold is equipped with a rigid outer frame, in the openings of one of the sides of which are installed hydraulic cylinders with couplers and springs, and about the inner side of the outer frame is supported by a wide crystallizer wall located on the opposite side of the wide wall, pressed by the hydraulic cylinders, in addition, the springs are placed in the cavity of each hydraulic cylinder between the rod and the body, and the coupler is made in the form of a pressure screw and is located in the threaded through axial hole of the rod moreover, on the tail end of some pressure screws there are mounted nodes for fixing screws and a wide wall, and a nut is screwed on the rod outside the body of each hydraulic cylinder. 2. The mold of the continuous casting machine according to claim 1, characterized in that the fixing unit is a C-shaped vertical guide mounted on a wide wall, and the stop of the tail of the pressure screw mounted therein.

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