JPS58221645A - Method and device for cooling guide roll or roll of continuous casting installation - Google Patents

Abstract

PURPOSE:To prevent partial overheating of guide rolls and pinch rolls for an ingot in a continuous casting device hence generation of cracking on the surface thereof, by cooling locally the ingot side surface of said rolls. CONSTITUTION:The guide rolls and pinch rolls for a continuous casting ingot to be used for a continuous casting of steel receive much thermal load on the surfaces in contact with the continuous casting ingot on account of a low casting speed and generate cracking in their surfaces. The generation of cracking is prevented by forming passages 5 for cooling water near the side of a roll 2 in contact with a continuous casting ingot 1 and cooling the roll 2 mainly on the side in contact with the ingot 1. A water-feed header 6 and a discharge header 7 are constituted respectiely in the open end parts of the passages 5. Communicating apertures are thus formed axially in the circumferential direction of the cylindrical part of the roll 2, thereby constituting the passages 5. The temp. difference in the surface of the roll 2 as well as the generation of surface cracking are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cooling guide rolls or pinch rolls of continuous casting equipment for unexploded BA, and its installation. Traditionally, in continuous casting equipment, there have been methods for cooling pinch rolls or U-guide rolls (rho, simply referred to as rolls; bo) by flowing cooling water through the center of the rolls, and by cooling the sleeve and shaft of sleeve rolls. f! A method of flowing cooling water was used in '11, but there are the following open circuits.

That is, FIG. 1 is a normal ITU 1 diagram showing a partial cross-section of a roll that is cooled by a single flow of cooling water in the center, and in FIG. A cooling water introduction passage 3 is formed along the axial direction in the central portion #C of the roll 2, and the passage 3 is made up of a Niho pipe 3abdb, and the tip 3C of the passage 3 is closed. Cooling water is introduced from the left side in Figure 1. Cooling water is introduced from the left side of Figure 1 through the rotary joint at the end of the tube in the direction of the arrow. Cool the two rolls through the annular passage, and after cooling, drain through the inner pipe 3b (1' and 3f) to the rotary stain 4 and discharge.

With this cooling method "C", if there is a steady cast-like bag, that is, if the roll is constantly rotating, a large gap R # "
jI don't live there. However, if the roll is in contact with the slab, such as at a casting joint or when trouble occurs, or if the roll is stopped rotating, the surface rim degree of the part of the roll that is in contact with the slab increases significantly. However, the thermal stress on the roll surface is a major factor in promoting heat cracks.

In addition, if the above cooling method is used, the difference between the temperature on the casting side and the non-casting side of the roll will be large, resulting in -f scratches on the roll and the rotation of the roll. The eccentricity of this roll has an adverse effect on the slab and C.
This also leads to overloading of the Ftff-roll itself, and when combined with the heat crack mentioned above, it does not reduce the life of the roll.

The present invention aims to solve the problem of υ, and specifically provides a cooling method and a device 1' which can locally cool the surface of a brazed slab 948. History 1c To give a more detailed explanation, various rolls in continuous casting equipment have a feeling of use at low casting speeds such as 0.8 to 1.2 m/min, so the contact surface of the roll and the non-contact surface of the slab are Even if a cooling force is applied as described above, a large temperature difference occurs between the contact surface and the contact surface, which is a big problem, especially when stopped. It will provoke. In order to solve this problem, the present invention proposes a method for applying heat load;
provide.

The present invention will be described with reference to FIGS.

In addition, FIG. 2 shows a partial cross-section of a roll cooling equipment according to the actual MfJρU of the present invention. Figure 3 is a sectional view taken along the line A-A, and Figure 4 is a front view showing a part of a roll cooling device according to another embodiment 11 of the present invention in cross section. There is.

1. In Fig. 2 and Fig. 3, reference numeral 1 indicates a casting plant j, a two-piece roll 1, and at least one cooling water passage 5 is formed in the vicinity of the slab contact side in this roll 2. . This cooling water passage 5 is connected to the four-hole 2 on the side that contacts the slab IK. The cooling field can be constructed in any manner as long as it can achieve this purpose.

That is, as shown in FIG. 3, a communicating hole is formed along the axial direction in the circumferential direction of the body of one roll 2, and the cooling water passage 5 is formed by this communicating hole. do. The open ends of the 1ft-1 cooling water passage 5 are connected to a water supply header 6 and a drainage header 7, respectively. As shown in FIG. 1, it is sufficient for the water supply vine 6 to be constructed by extending a portion of the cover of the bearing 8 to reach the end of the body of the roll 2, as shown in FIG. A sealing gasket 80 is appropriately provided at a place where the parts come into contact with each other.

f, the drain header 7 and the bearing 10 on the moving side also cover the open end of the cooling water passage 5. In addition to the spacer 9, it reaches the inside of the bearing JO of the MiJ moving 4, and is it smooth together with the roll 2? Reference numeral 9 has a rotatable structure, and a bearing 1 is disposed between the bearing 10 and the spacer 9.

Note that the spacer 9 has a protrusion 9a formed thereon, and the bearing] (
IKilr protrusion J (l a%j (+ b or formation j
t1. , a protrusion on the protrusion E Oas j Ob nl'
This will prevent foreign objects from getting caught between the two shores.

'F'fc, bearing in bearing 10] (ICil, To accommodate movement due to thermal expansion of roll 2, a gap C is provided between bearing IOC and bearing JOP3Vr. Also, a hole facing roll 2Kb in the radial direction ]3, this hole 11 is used as a cooling water discharge hole, and this extraction hole J] is formed as a shaft hole 1.
2, the cooling water is discharged through the cooling water passage 5 to the discharge header 7.
The oil is then discharged by valving the successor 11, shaft hole 12 and rotary joint 4.

In addition, the cooling water passage must be 1. As shown in Fig. 3, there is no need to form a cooling water supply pipe (i a) to lead the cooling water f to the rudder 6. Only in the contact area, cooling water can be supplied only to the cooling water passage 5 in the area that comes into contact with the slab from this hole.

In addition, each water supply and drainage pipe is not necessarily configured as described above,
At least the structure can be constructed as shown in FIG.

In other words, in the row shown in the fourth column, the cooling water supply and drainage headers have the same structure and are 7'C, and the bearing 1 on the moving side
A part of the roll body end KiI is tightened by extending a part of the spring and a part of the spring, and 7 headers on the cooling water discharge side are constructed there. 1 fc% A sealing gasket is provided at this sliding and abutting portion, as in the case of the water supply side header 6, as described above.

As will be described in detail, the present invention forms a cooling water passage in the circumferential direction of the roll to improve the contact between the roll and the slab.
k JS Partially cooled. Accordingly, the slab gi11 of the roll that requires the most cooling water f can be cooled at one point, and the entire life of the roll can be greatly extended.

In addition, the above cooling method can be generally applied to roller casting equipment where the internal water surface of the roll must be imitated, especially when the cooling part is controlled.

[Brief explanation of the drawing]

Is 61σ/1 part of the conventional roll cooling system for Aji IK? I
Figure 2 is a front view showing a cross section of a part of a roll cooling device according to an embodiment of the present invention.
The figures are a cross-sectional view taken along the line A--A in FIG. 2, and a front view showing a partial vr' cross-section of the roll cooling device attached to another implementation decoy 1 in FIG. 4 tJ. Code 1: Slab 2: Low/L/3: Cooling water passage 4: Rotary joint end: Cooling water Passage 6...
... To the water supply side Soda 7 ... Drainage flll11 Header 8 ... Bearing 901106. Spacer 10
・・・・・・III Specialty Fraud Applicant Representative of 111saki Steel Co., Ltd. Patent Attorney Matsushita Kofaten 11φ Attorney Fumio Soejima

Claims (1)

[Scope of Claims] 1) A kit for continuous casting equipment in which a cooling water passage is provided near the slab contact side of a guide roll or pinch roll of continuous casting equipment to locally cool the rolls. Method for cooling rolls or pinch rolls. 2) Cooling water communication holes along the circumferential direction of the body of the guide roll or punch roll? At the same time, 11. A cooling device for a guide roll or a wedged pinch roll in continuous casting equipment, characterized in that the cooling device is formed at both ends of the roll body so as to communicate a water supply header and a drainage header.