JPS6049043B2 - Continuous rolling annealing method for steel plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to equipment that continuously performs cold rolling and annealing of steel plates.

If a process that connects a cold rolling mill and continuous annealing treatment equipment is realized, it will be possible to immediately obtain the final product, a cold-rolled thin sheet, from a hot-rolled steel sheet, resulting in significant energy savings. be.

Generally, in cold rolling, power of about 30 to 80 KWH/TON is consumed as driving power for rolling rolls. This pressure becomes plastic working heat for the steel plate, which increases the temperature of the steel plate and the rolling rolls. However, in conventional cold rolling mills, a large amount of coolant is projected onto the rolling rolls and the steel plate to increase the temperature of the rolls and the steel plate. It was used to prevent temperature rise and provide rolling lubrication. The purpose of cooling the rolling roll is to maintain its surface temperature below a certain value, to prevent deterioration of the roll (particularly a decrease in hardness), and to prevent deterioration of the lubricity of the rolling lubricant.

In addition, in the conventional process for cooling steel plates, the steel plate after rolling is wound up as a coil and left for a long time until it is unwound again in the next process. However, the purpose of this was to prevent this from becoming a stain, which significantly impairs the quality of the finished product. However, in a process in which a cold rolling mill and continuous annealing equipment are connected, the steel plate after cold rolling is immediately sent to the subsequent continuous annealing equipment, and a degreasing process provided at the entrance side of the equipment Rolling lubricating oil on the surface of the steel plate is removed.

In other words, the hot steel plate with rolling oil attached to it will not be left for a long time, and the above-mentioned problems of deterioration and fouling of the rolling oil will be eliminated, so there is no need to cool the steel plate. If the steel plate is sent to the annealing process at as high a temperature as possible, the energy required for heating in the annealing process can be significantly saved. 30 required for the aforementioned cold rolling
If the electric power of ~80KWH/TON is all used as heating energy for the steel plate, the temperature of the steel plate will be 190~5000.
C also increases, and considering that the heating temperature in the annealing step is 700 to 800°C, attention was paid to the fact that extremely large energy savings may be achieved.

Therefore, the present inventors completed the present invention as a result of research to realize the above-mentioned advantages in a process that connects a cold rolling mill and a continuous annealing process.

The present invention will be explained below with reference to the drawings.

In the present invention, the cold rolling mill 1 includes a bridle roll 3
The continuous annealing facility 2 is introduced via the strand looper 4 into the continuous annealing facility 2, which has a known continuous annealing furnace 6 and a loop cark and skin bath mill 8.

Therefore, the steel strip 10 is cold-rolled into a finished product having a predetermined thickness, which is then processed by the winder 9 into a finished coil. Preferably, the bath between the exit side of the rolling mill 1 and the entrance of the annealing furnace 6, which mainly includes the bridle roll 3 and the strand looper 4, is kept warm by a heat insulating wall 11 made of a heat insulating material. Therefore, the plastic working heat in the cold rolling mill is effectively used as part of the heat required in the heating zone of the continuous annealing furnace 6 that follows.

FIG. 2 is an explanatory diagram showing an example of the prior art.

The coolant, usually consisting of a mixture of water and rolling oil, is projected onto the roll 12 and the steel plate 10 by a nozzle 13. The water in the coolant is for cooling purposes, and when the coolant collides with the steel plate, the rolling oil separates from the water and adheres to the steel plate, acting as a rolling lubricant. 14-1
15 is a waste oil tank, 15 is a filter, 14-2 is a clean rolling oil tank, and 16 is a pump.

However, in the conventional method, the coolant naturally has a large cooling effect on the steel plate, and the object of the present invention cannot be achieved.

FIG. 3 illustrates the method of the invention.

A nozzle 17 for cooling the roll is provided on the exit side of the mill and projects toward the contact point between the work roll and the backup roll. A waterproof plate 19 is provided to prevent the coolant from the upper nozzle 17-a from falling onto the steel plate. The waterproof j-board 19 comes into contact with the work roll, and a soft material 20 such as rubber or felt is attached to this contact portion to prevent the work roll from being damaged. According to experimental results, the rate at which rolling power is converted into heat and transmitted to the rolls is 10 to 20%.
Therefore, compared to the conventional method in which all the heat equivalent to the rolling power is removed by coolant, the amount of coolant to be sprayed may be 115 to 1110. 18 is a nozzle for spraying rolling lubricating oil onto the steel plate.

The amount of rolling lubricant oil to be sprayed must be the minimum amount necessary for rolling lubrication, and it must be avoided to cool the steel plate significantly by spraying too much oil. As shown in Figure 3, the roll coolant system supplies a mixture of rolling oil and water to nozzle 1.
7. It may be a circulation method in which water is projected from the nozzle 18, or as another embodiment, the water is ejected from the nozzle 17 and the water is ejected from the nozzle 1.
8 and above, there may be a linear method in which rolling oil alone or highly concentrated rolling oil is projected. This method is suitable for high-speed rolling of relatively thin copper sheets. Example plate thickness = 3.57177
! , board width = 920r1r1n1 product thickness = 1.0-m! n
Original plate temperature = 25°C, rolling speed = 500 TL, / min, rolling mill: 4-stand tandem coolant flow rate (Fig. 3 nozzles 17-A, 17-b)
Flow rate of lubricating oil (projected from nozzles 18-A and 18-b in Fig. 3) = 30 to 40 ' minute stand (concentration and temperature are the same as the coolant) Under the above conditions, the plate temperature on the exit side of the rolling machine was 255 to 26.
It was heated to 0°C.

In addition, the plate temperature at the exit of the rolling mill of Yanghe, which was rolled under the same conditions as above with a large amount of coolant being injected at the inlet side of each stand as before (Fig. 2), was approximately 85°C, and the temperature of the plate at the outlet of the rolling mill of the present invention was approximately 85°C. The effect is clear.

The above-mentioned floor invention can effectively utilize the plastic working heat during rolling in a cold rolling mill, greatly improving the energy efficiency of the cold rolling continuous annealing connection process, and has great industrial effects. .

[Brief explanation of the drawing]

Fig. 1 is an overall explanatory diagram of the present invention, Fig. 2 is an explanatory diagram of the conventional method,
FIG. 3 is an explanatory diagram of the main part of the present invention. 1: cold rolling mill, 2: continuous annealing treatment equipment, 3: bridle roll, 4: strand looper, 6: continuous annealing furnace,
11: heat insulation wall, 12: roll, 13: nozzle, 14: tank, 15: filter 17: nozzle, 19: waterproof board,
20: Soft material.

Claims (1)

[Scope of Claims] 1. A rolling lubricant coolant for a continuous treatment process of steel plates that connects a cold rolling mill and annealing equipment is composed of a roll coolant system and a rolling lubrication system, and the coolant is supplied to the rolling rolls from the exit side of the rolling mill. The coolant adhering to the steel plate is regulated through means for preventing coolant from falling on the rolling rolls, and rolling lubricating oil is supplied from the entrance side of the rolling mill to achieve the minimum amount of lubrication required for cold rolling. A continuous rolling annealing method for a steel plate, which is characterized by controlling the amount of blasting to obtain an effective effect. 2. Continuous rolling of a steel plate according to claim 1, characterized in that the steel plate conveyance path from the exit side of the rolling mill to the entrance of the annealing equipment is protected with a heat insulating material, and the steel plate is conveyed along the conveyance path. Annealing method.