JPS582483Y2 - Roll cooling device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a roll cooling device, and more particularly, to a roll cooling device that is capable of uniformly cooling work rolls used in a cold rolling mill in an extremely short period of time. It is something.

In general, work rolls in cold tandem rolling equipment are re-polished after a certain rolling time or a certain rolling amount (production amount) due to the importance placed on the surface quality of the rolled steel plate. .

The processing accuracy required for this work roll, that is, roundness of 2 cylindrical degrees, radius runout, roll crown, etc., is, for example,
Regarding the surface roughness of the work roll, it is 1.5- as specified by Japanese Industrial Standards (JISB0601).
An ultra-precision finish called S is required, and extremely high roundness with a diameter difference of 0.005WIm (5μ) is also required in order to maintain a high level of plate thickness accuracy.

Therefore, when repolishing the work roll after rolling, it is necessary to satisfy the surface accuracy and roundness as described above, but the temperature of the work roll immediately after rolling is raised to 60 to 70°C due to the heat of rolling. Therefore, if the polishing process is performed as is, it can be expected to obtain the processing accuracy as described above, but it is necessary to perform the polishing process after the work roll has been sufficiently cooled (to room temperature).

Due to the large heat capacity of the work rolls, it takes 96 hours to cool the work rolls to room temperature by natural cooling.
As a result, when considering the cold rolling equipment, in other words, the work roll replacement cycle, it is necessary to have a large number of work rolls, making roll management complicated. Moreover, it also has the disadvantage of increasing production costs.

The present invention is a roll cooling system that can shorten the cooling time of work rolls for tandem mills in cold rolling factories, reduce the number of rolls owned, and improve roll processing accuracy and workability. It is a device.

The feature of the roll cooling device according to the present invention is that frames with openings at the top are installed at intervals for housing the rolls to be processed, and the rolls to be processed that are placed in the frames are placed on top of each frame. The purpose of the present invention is to provide a nozzle that can be adjusted to eject the liquid medium toward the apex of the roll, and to provide a pinch that becomes denser as it approaches the roll neck.

The roll cooling device according to the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is an overall schematic side view of the roll cooling device according to the present invention, in which numeral 1 denotes a roll stand with an open top for storing and placing work rolls R taken out from cold rolling equipment, and a weir 2 at the bottom. is set up to collect the cooling medium W used for cooling the work roll R, and is returned to the hot water tank 4 through the water collection pipe 3. 6, the water is sent to a cooling tower 7, cooled and stored in a cold water tank 8, and then supplied to the roll stand 1 by a pump 9 via a cooling medium supply pipe 10, in a closed circuit.

As shown in detail in FIGS. 2 to 5, the roll stand 1 for cooling the work rolls R has frames 11 erected at equal intervals so as to form an opening at the top so that a pair of upper and lower work rolls can be accommodated. A riser pipe 10 connected to the supply pipe 10 of the cooling medium W is provided in the frame 11.
a is provided at the top of the frame 11 and connected to a header 12 extending in the axial direction of the roll (up to the roll neck).

As shown in FIG. 4, the header 12 has a plurality of nozzles 13 that spray and supply a cooling medium W to the work rolls R accommodated in the roll stand 1. As shown in FIG. In order to achieve a pitch between the left and right roll necks of the work roll, the injection ports are installed to cool the left and right roll necks of the work roll at the required pitch so that they are closer to each other than the pinch to the body near the roll neck part, and The nozzles 13 provided on the frames 11 facing each other with the roll R in between are arranged so as to be adjustable so that the cooling medium W passes through the nozzles 13 and collides with each other at the top vc of the upper work roll R.

The roll cooling device according to the present invention has the above configuration, and its embodiment will be described.

Work rolls R that have been used for a certain period of time and have been placed on a mill are housed in a pair of upper and lower rolls in the frame 11 on a roll stand provided at the lower part of the frame 11, with a spacer 14 inserted between the rolls (Fig. 1). 10).

Next, the pump 9 is operated to supply the cooling medium W via the supply pipe 6.

The cooling medium W is ejected from the nozzle 13 provided in the upper part of the frame 11 toward the top of the processed roll R, and the cooling medium W ejected from the right and left nozzles 13 hits the top of the upper work roll R. It flows down as a laminar flow on the surface of the work roll R while forming a spread in the direction of the mating axis (roll), uniformly cooling the surface of the upper work roll R, and then flowing to the lower work roll R. The work roll R is uniformly cooled while flowing down on its surface in a laminar flow, and then returns to the hot water tank 4 as hot water.

The hot water in the hot water tank 4 is sent to the cooling tower 7 via the hot water pipe 6 by operating the pump 5 to be cooled and then stored in the cold water tank 8.

In forced cooling of the work roll, the cooling medium W ejected from the nozzle 13 collides with the top of the work roll R, and as a result, the cooling medium W covers the entire work roll R in a laminar flow, allowing wide and uniform cooling.

In addition, the Am medium jetting ports of the nozzle 13 are arranged so that the pitch is equal in the center of the work roll R, and the pitch is denser in the vicinity of the neck of the work roll R than in the center, as shown in Fig. 4. From the viewpoint of rust prevention, when the temperature of the work roll R approaches room temperature due to the progress of cooling, by supplying the cooling medium W to the The amount of heat held by the bearings of the rolls that have not been rolled (40 to 50℃ immediately after rolling)
It has a temperature of

), this is to prevent the roll neck from increasing in temperature, thereby making it possible to uniformly cool the entire work roll.

Figure 6 shows the relationship between the surface temperature of the work roll and the cooling time when the work roll is cooled by the roll cooling device according to the present invention. According to this figure, the work roll surface temperature B reaches room temperature in about 3 hours. C (24.6° C.), which is in good agreement with the calculated roll center temperature A.

The cold water tank is provided to reduce the temperature change of the cooling medium between the beginning and end of cooling, and the cooling tower is only used in the summer when the water temperature and wet bulb temperature are high, and during normal operation, the cooling tower is used only when the water temperature and wet bulb temperature are high. Deactivate the tower.

In addition, by containing 3 to 4 times more grinding oil (emulsion) in the cooling medium, the rust prevention effect of the roll to be treated is achieved, and by circulating the cooling medium, the amount of oil and fat used and the amount of oil-containing wastewater treated are reduced. It is something that can be done.

As is clear from the above description, the roll cooling device according to the present invention has the above configuration.
Since the cooling time of work rolls in cold tandem rolling equipment after rolling can be extremely shortened, the number of work rolls held can be extremely reduced, making roll maintenance easier and reducing production costs. The effect is that it can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing the roll cooling device according to the present invention, Fig. 2 is an enlarged schematic view of the frame, Fig. 3 is a detailed enlarged view of the upper part of the frame, Fig. 4 is a schematic view of the nozzle, and Fig. 5 is a schematic diagram showing the flow of the cooling medium, and FIG. 6 is a graph showing the relationship between the temperature of the work roll and the cooling time. 1 - roll stand, 2 - weir, 3 - water collection pipe, 4 - hot water tank, 5, 9 - pump, 6j10 - pipe, 7 - cooling tower, 8 - water tank, 11 - frame, 12 - header, 13 - nozzle, 14~Subey VR~Work roll, W-Rei nail medium.

Claims (1)

[Scope of utility model registration request] Frames that open at the top are set up at intervals for storing the rolls to be processed, and nozzles can be adjusted on the top of each frame to eject cooling medium toward the top of the rolls to be processed that are placed within the frame. A roll cooling device characterized in that the roll cooling device is provided so that the pitch becomes denser as it reaches the roll neck portion.