KR100418989B1 - Roll cooling device by porous media - Google Patents

Abstract

The present invention relates to a technique for cooling a rolling roll used in a hot rolling process, and more particularly, to a roll cooling apparatus configured to increase cooling efficiency by using a porous body and to reduce cooling water.

The present invention provides a cylindrical porous body (9) that can be rotated in contact with the cooling target roll (1), and a cooling water supply pipe (11) installed inside and outside the porous body (9) so that the cooling water can be supplied and retained in the porous body (9). ), And the porous body 9 is made of a porous body such as polyester having a porosity in the range of 0.2 to 0.98.

Description

Roll cooling device using porous body {ROLL COOLING DEVICE BY POROUS MEDIA}

The present invention relates to a technology for cooling a roll for hot rolling a rolled material into a plate in a rolling process, which is one of the production processes of a hot rolled steel sheet of a steel mill, and in particular, it is possible to improve cooling efficiency by using a porous body, and to reduce cooling water and It relates to a roll cooling apparatus using a porous body designed to bring about a reduction in overall costs.

In the existing hot rolling process, the rolling roll is sprayed toward the roll 1 at a high pressure, as shown in FIG. 2 (a), so that the roll cooling is performed by the sprayed spray coolant (4). Also, as shown in Fig. 2B, a roll cooling method for bringing the water film 6 by the cooling jacket 5 into contact with the roll has also been used.

In the case of the rolling roll 1 used in the hot rolling process as shown in the example of FIG. 1, since the contact with the high temperature raw material 2 at high pressure occurs in the contact portion between the roll and the raw material, the temperature becomes very high, It will rise to temperature. Therefore, in order to cool the rolls, a high-pressure, high-capacity pump is currently operated to cool by the cooling water spray method of FIG. 2 (a) or the water film forming method of (b). However, in the case of the spray cooling method as shown in FIG. 2 (a), the sprayed cooling water 4 is immediately lost by gravity after the sprayed cooling water 4 contacts the roll, and the cooling water 7 that is lost serves its utility. Therefore, there is a serious problem of waste of the roll cooling water. In addition, in the cooling method by the water film as shown in FIG. 2 (b), the cooling jacket 5 for forming the water film 6 is installed to surround the roll, which causes the cooling jacket 5 to scratch the roll surface. There is a problem that causes serious damage to the roll, such as scratching occurs.

Accordingly, an object of the present invention is to provide a roll cooling apparatus of a further improved form to effectively solve the above conventional problems.

1 is a schematic perspective view of a rolling roll to which the present invention is applied;

Figure 2 (a), (b) is a schematic perspective view showing a conventional roll cooling method,

Figure 3 is an enlarged cross-sectional view of the porous body,

4 is a schematic diagram of porosity calculation of a porous body;

5 is a schematic cross-sectional view showing a roll cooling state to which the present invention is applied;

Figure 6 is a perspective view of the state of use of the cooling device according to the present invention.

Explanation of symbols on the main parts of the drawings

1: rolled roll 2: rolled material

3: spray nozzle 4: spray cooling water

5: Water Cooling Jacket 6: Water Film

7: Lost cooling water 8: Pore of porous body

9: Porous Media 10: Unit area for porosity calculation

11: cooling water supply pipe 12: cooling water

13: porous roll cooling device

Hereinafter, with reference to the accompanying drawings, the present invention for achieving the above object will be described in more detail.

Figure 3 shows the cross-sectional configuration of the porous body 9 as applicable to the present invention in a schematic manner, which is preferably made of resin such as polyester, synthetic resin, ceramic, nylon, fiber, etc. It is made, and more preferably a material made of polyester. The porous body 9 is characterized by having a suitable pore (8), good functionality and free change of shape. The present invention is intended to be applied to the cooling of a rotating roll using such a porous body. In the case of the porous body as described above, the water functionality and permeability are changed according to the porosity. The porosity is defined as the area of the pores 8 per unit area 10 of the porous body 9 as shown in FIG. If the porosity is low, the water content is lowered, but it can be used even at high speed. If the porosity is large, the cooling effect is increased, but at high speed, the water content is decreased by centrifugal force. In the present invention, the porosity of the porous body in the range of 0.2-0.98 to adjust the cooling capacity. The following equation (1) is a calculation formula of the porosity.

Porosity = pore area / unit area -------------- (1)

5 and 6, the present invention constitutes a cylindrical porous body 9 which rotates in contact with the roll 1 for cooling the rotating roll 1. A cooling water supply pipe 11 is installed inside the cylindrical porous body 9 to supply cooling water, and a cooling water supply pipe 11 is also installed on the outer surface of the porous body 9 to supply cooling water from the surface. The roll 1 is in contact with the cylindrical porous body 9 of the present roll cooling device 13 while rotating after contact with a high temperature material, and at this time, the roll 1 is in contact with the cooling water held by the porous body 9 Cooling is performed by boiling or forced convection. At this time, the porous body 9 is in contact with the roll 1 and idlely rotated, so that no additional driving means for rotation is needed, but is supported only by a member such as a bracket. Only the rotating shaft is required and the cooling water supply pipe 11 installed therein may take its role.

When performing the roll cooling using the roll cooling apparatus 13 using the porous body of the present invention as described above, there is almost no roll cooling water lost due to the action of the porous body 9, thereby increasing the efficiency of cooling. The energy saving, productivity improvement, thermal breakdown of the roll can be reduced accordingly. In addition, the surface quality of the product can be improved because the surface of the roll does not scratch the surface defects such as scratches.

Claims (3)

In the apparatus for cooling the rolling roll (1) used in the rolling of hot rolled steel sheet, It includes a cylindrical porous body (9) that can be rotated in contact with the cooling target roll (1), and a cooling water supply pipe (11) installed inside and outside the porous body (9) so that the cooling water can be supplied to the porous body (9). The roll cooling apparatus using the porous body characterized by the above-mentioned structure. The roll cooling apparatus according to claim 1, wherein the porous body (9) has a porosity in the range of 0.2-0.98. The roll cooling apparatus using a porous body according to claim 1 or 2, wherein the porous body (9) is made of a porous body such as polyester, synthetic resin, ceramic, nylon, and fiber.