JPS6130721Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strip guide for a multi-high rolling mill used as a cold strip rolling mill.

Multi-high rolling mills such as 12-high and 20-high rolling mills are often used for this type of rolling. Adjustment of the rolling reduction amount of the work roll is achieved by moving the lower roll set (or upper and lower roll set) consisting of the upper work roll, intermediate roll, and backing roll, so that the height of the biting part of the work roll is adjusted to the height of the bus line of the rolled material. However, since the space between the upper and lower rolls is narrow and it is difficult to install guide rolls, a pair of upper and lower strip guides facing the biting part of the work rolls is installed on the entrance side of the rolling mill and It will be installed on the exit side to guide the strip.

In addition, in this type of rolling mill, in order to remove the heat generated during rolling or to reduce the coefficient of friction at the work roll engagement area, various types of oil, such as balm oil, are applied to the work roll engagement area. It is necessary to supply a certain amount of coolant oil, and this supply is accomplished by using the strip guide itself and making the strip guide have a structure having a coolant oil supply passage.

This coolant oil must be sufficiently and appropriately supplied at the entrance and exit sides of the rolling mill.
At the rear of the exit side, the rolled strip must be removed and recovered before it is wound onto a reel, and this removal is conventionally accomplished by installing an air wiper, rubber wiper, squeezing roll, etc. behind the rolling mill housing. However, there is a problem in that the distance between the rolling mill and the strip take-up reel becomes long due to the installation of these coolant oil removal equipment, and the installation area of the plant equipment becomes large. Furthermore, temperature differences between various parts of the strip during rolling have an adverse effect on the thickness, shape, and precision of the strip after cooling, and tend to increase the off-gauge amount of the strip.

The present invention fundamentally solves the problems of these prior art devices by improving the strip guide itself. The strip guide for a multi-high rolling mill of the present invention is a pair of strip guides that are installed on both the entry and exit sides of work rolls of a multi-high rolling mill and are arranged vertically opposite each other with a pass line in between. A coolant oil supply passage for the work roll is formed inside, and multiple nozzles are installed in the width direction on the surface facing the pass line of the strip guide so that the nozzle near the center is located near the biting part of the work roll. The nozzle is arranged in a V-shape in plan, and a fluid circuit is connected to the nozzle for selectively switching and supplying coolant oil and compressed air.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a partial longitudinal sectional side view of a strip guide according to an embodiment of the present invention, shown in relation to a roll set of a multi-high rolling mill. In this example, the upper and lower roll sets of this multi-high rolling mill consist of a work roll 1, an intermediate roll 2, and a backing roll 3, and have a 12-stage configuration. The strip S passes through a nip point, that is, a nip 4 between the work rolls 1, 1, is rolled, and moves along a pass line P.

Strip guides 5 according to the present invention are installed on the entry and exit sides of the biting portions 4 of the work rolls 1, 1, respectively.
A and 5B are provided to smoothly guide the introduction and extraction of the strip S into the biting part 4 and prevent it from being caught. Since both guides 5A and 5B have the same structure, the exit strip guide 5B
I will represent and explain.

The strip guide 5B consists of an upper guide plate 6 and a lower guide plate 6' which are wider than the strip width. The upper guide plate 6 is pivotally supported near the base end by a bracket 8 attached to the rolling mill housing 7, and is fixed after adjusting the angle so that the left end in the figure faces the biting part 4 of the work roll 1. The lower guide plate 6' is slidably inserted into the guide 20 and supported. Hereinafter, the upper guide plate 6 will be explained as a representative example.

A coolant oil supply passage 10 is formed in the upper guide plate 6 by a groove provided on its outer surface and a cover plate 9 covering the groove, and a spray opening 11 at the left end thereof faces the work roll 1 as a nozzle. Hydraulic pump 1 driven by motor 13 from oil reservoir 12
The coolant oil fed under pressure to the upper guide plate 4 communicates with the header 15 at the base of the upper guide plate 6, passes through the supply passage 10 from here, and is sprayed onto the work roll 1 from the left end spray opening 11.

The upper guide plate 6 is provided with a group of five nozzles 16, which are distributed in the width direction and open on the surface facing the pass line P. As shown in Fig. 8, the nozzles are arranged in a V-shape in a plane so that the nozzles closer to the central position are located closer to the biting portion 4 of the work rolls. These nozzles 16 are connected to a common header 17 and a three-way valve 18 as shown in the fluid circuit of Fig. 2.
The hydraulic pump 14 is connected to the coolant hydraulic supply side and the compressed air source 19 via the three-way valve 18, and these fluids are selectively switched to supply the nozzle 1
In the inlet strip guide 5A, the nozzles 16 are connected to a coolant oil supply system, and in the outlet strip guide 5B, the nozzles 16 are connected to a compressed air system. Figure 4 shows the spray pattern from the nozzles 16 onto the strip S.

The temperature distribution in the width direction of the strip S when passing through the biting part 4 of the rolling mill is shown in FIG. The higher the center, the higher the temperature, and the higher the ends, the lower the temperature. This temperature distribution tendency causes an increase in the amount of off-gauge during the process of cooling the strip from the temperature immediately after rolling to room temperature. This temperature distribution tendency is exacerbated when the material is wound onto a take-up reel. In other words, the temperature drop is large at both ends in contact with the atmosphere, and small at the center. The temperature difference between the sides of the strip immediately after the rolling mill and the center position is, for example, about 5 to 10°C, but the temperature difference between the inside of the wound coil and the sides is estimated to reach 20 to 50°C. These temperature distribution trends are difficult to correct when uniform coolant oil is supplied in the width direction using conventional techniques.

In the present invention, by spraying coolant oil from the 16 groups of nozzles arranged in a V-shape of the inlet strip guide 5A, the coolant oil is supplied closer to the biting part 4 as the nozzles are closer to the center, and is supplied in a concentrated manner. . When the same amount of coolant oil is supplied, the flow rate per unit area is large at the center and small at both ends, and as a result, the temperature drop of the strip is greater near the center than at both ends, so the temperature distribution after cooling is It is possible to approximate the uniform distribution shown by line a in the figure. In this way, apparent errors in the shape due to differences in thermal expansion of the rolled strip, that is, even if the shape is uniform, thick, and flat during rolling, the uniformity of the shape deteriorates when the temperature reaches room temperature. It disappears. Moreover, the winding state of the coil is improved.

Furthermore, by blowing compressed air from the 16 groups of V-shaped nozzles of the exit strip guide 5B, the air wiping effect on the coolant oil adhering to the strip pushes the coolant oil from the center to both sides, allowing it to be efficiently discharged to both ends. can be wiped. The 16 groups of nozzles serving as air wipers are located in the middle of the strip guide and housed in the rolling mill housing, which is advantageous in terms of space compared to the conventional arrangement of separate rubber wipers, air wipers, and squeezing rolls. The distance between the machine and take-up reel can be shortened.

As described above, according to the present invention, it is possible to achieve good strip rolling results using a multi-high rolling mill, it is possible to effectively recover coolant oil, it is possible to omit conventional recovery facilities, and the required floor space for installation of plant equipment is It has a structure that can be used commonly on the inlet and outlet sides of the rolling mill, and has the advantage of being able to be equipped with a strip guide of an integrated configuration with less equipment and operating costs.

[Brief explanation of drawings]

Fig. 1 is a partial vertical cross-sectional side view of a strip guide according to an embodiment of the present invention shown in relation to the roll set of a multi-high rolling mill, Fig. 2 is its fluid circuit diagram, and Fig. 3 is the main part of the nozzle group. FIG. 4 is a plan view of the spray pattern, and FIG. 5 is a temperature distribution diagram. 1... Work roll, 2... Intermediate roll, 3...
... Back roll, 4 ... Biting part, 5A, 5B ... Strip guide, 6 ... Upper guide plate, 6 ... Lower guide plate, 7 ... Rolling mill housing, 8 ... Bracket, 9 ... Cover plate, 10... Supply passage, 11... Spray opening, 12... Oil reverser, 13... Motor, 14... Hydraulic pump, 15
... header, 16 ... nozzle, 17 ... header,
18... Three-way valve, 19... Compressed air source, 20...
Guide, S... Strip, P... Pass line,
a, a′...Temperature distribution curve.

Claims (1)

[Scope of utility model registration request] A pair of strip guides that are installed on both the entry and exit sides of the work rolls of a multi-high rolling mill and are placed vertically opposite each other with the pass line in between. While forming a passage, a plurality of nozzles are arranged in a V-shape in the width direction on the surface facing the pass line of the strip guide so that the nozzles closer to the center are located closer to the biting part of the work roll, A strip guide for a multi-high rolling mill, further comprising a fluid circuit connected to the nozzle, which can selectively switch and supply coolant oil and compressed air.