JPS62158507A - Rolling mill - Google Patents

Abstract

PURPOSE:To improve the strength of work rolls and to permit stable bending by housing the work rolls into a frame united to one body, incorporating the assembly into a multi-stage sheet rolling mill and providing a device to act bending force to the frame. CONSTITUTION:The small-diameter work rolls 5 are housed into the frame 1 to constitute a roll frame unit 6 which is then incorporated into the multi-stage sheet rolling mill. The roll frame unit 6 is constituted shiftably and offsetably. The distance L between journal boxes 3 and 4 of the small-diameter work rolls 5 can be, therefore, made shortest possible and the strength thereof is improved by which the extremely large rolling force is obtd. The bending force is acted on the frame 1 by a bending cylinder 15 to bend the entire part of the roll frame unit 6 by which the horizontal bending of the small-diameter work rolls 5 is prevented and the stable bending is executed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a multi-high rolling mill.

[Prior Art] As a means of reducing the rolling load, an effect can be obtained by using a small diameter work roll. Particularly in recent years, rolling of special steel materials that are difficult to process has increased, and rolling force with conventional roll diameter specifications is insufficient. Therefore, small-diameter work rolls have come to be used. On the other hand, the small diameter work roll is used in combination with a conventional roll diameter, or the conventional roll is used as an intermediate roll and the small diameter work roll is inserted therebeneath.

[Problems to be Solved by the Invention] However, in the conventional method described above, the axle boxes on the work side and the drive side that support the small-diameter work rolls are separated, and therefore, as described in detail below, It had various problems.

(A) It is necessary to guide and fix each axle box to the center of the housing on the working side and the driving side, and for this reason, the length of the small diameter work roll becomes long relative to the diameter, and therefore the roll body There is a problem that the strength decreases in response to applied horizontal force, making it easier to bend and break. This problem is more likely to occur when bending force is applied to a small diameter work roll.

CB) As shown in Fig. 6, in a rolling mill in which the small-diameter work roll a is shifted so that its roll width coincides with the width edge of the material (temporary) b, the neck C of the small-diameter work roll a is It is necessary to increase the length by the shift amount, and this, together with the fact that the distance between the axle boxes d and e as shown in FIG.

In addition, when offsetting the small-diameter work roll a, in order to make the offset cylinder act on the axes Nd and e, an offset cylinder is installed in the shift block h, 1 for shifting the small-diameter work roll a and the intermediate roll 9 together. Therefore, when a roll shift is performed, hydraulic piping and the like are also moved due to the movement of the offset cylinder, which causes various problems in terms of design and maintenance. In the figure, j is the lower work roll, k and f are the shift blocks of the lower work roll j, m is the housing, and n and o
indicates a backup roll.

CC) Since the axle boxes d and e on the working side and drive side are not connected, each axle box d and e requires a radial thrust bearing p that can simultaneously support the thrust force as shown in Figure 8. , the equipment becomes expensive.

The present invention was made by focusing on the above-mentioned conventional problems.
By housing the work rolls in a multi-high rolling mill in an integrated frame and inserting them into the rolling mill as a roll frame unit, the strength of the work rolls is improved, making it possible to reduce the diameter of the work rolls and increasing the rolling force. The purpose is to enable stable bending of work rolls.

[Means for solving the problems] The present invention attempts to solve the above technical problems, and
In a multi-high rolling mill, a roll frame unit that houses work rolls supported at both ends by an axle box in an integrated frame is incorporated into a rolling mill housing, and a bending force is applied to the frame. The invention relates to a rolling mill characterized in that it is equipped with a bending device.

[Function] Therefore, in the present invention, the roll frame unit housing the work rolls in the frame is incorporated into the rolling mill housing, and the roll frame unit is bent together, so the work rolls can be bent to the minimum required size. By increasing its strength and rigidity in terms of length, it suppresses horizontal bending, thereby increasing the rolling force by reducing the diameter of the roll.
Allows for stable bending.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an example of a roll frame unit according to the present invention, in which an elongated opening 2 is provided on the inner side of an elongated framework (frame) 1 made of 14 hydride.
A small diameter work roll 5 whose both ends are supported by axle boxes 3 and 4 is inserted and supported inside the opening 2 to form a roll frame unit 6. Also, the frame 1 has one end and one axle box 3 for roll shifting.
The length between the two is formed to a required length S according to the amount of shift. In the above configuration, the pressure ff1L between the axle boxes 3 and 4 can be minimized by making the length of the small diameter work roll 5 the minimum necessary.

FIGS. 4 and 5 show an example of when the roll frame unit 6 is roughly loaded into a rolling mill, in which the intermediate roll 9 backed up by the upper and lower backing rolls 7.8 and the lower work roll 1o are Both sides of the roll frame unit 6 in the width direction are supported so as to be movable in the axial direction of the small diameter work roll 5 along a slide beam 11 attached to a fixed member.

Further, both ends of the roll frame unit 6 are provided in the housing 12 so as to be shiftable (shift blocks 13 .
The bending cylinder 15 provided in 14 allows the claw 1 to
6 to perform bending and roll balancing.

Further, a protrusion 17 formed at one end of the roll frame unit 6 is connected to a lock bolt 18 and a lock plate 19.
is fixed to one shift block 13 by a hook 20 formed at the other end of the roll frame unit 6.
A pivot hook 21 that engages with the other shift block 14 is attached to a connecting member 22 connected to the other shift block 14, and by moving the connecting member 22 through the shift cylinder 23, the shift block 13.14 and The roll frame unit 6 is integrated, and the roll frame unit 6 can be shifted along a slide beam 11.

Further, an offset cylinder 24.25 is provided at a predetermined position on the side opposite to the unit (outside) of the slide beam 11, and the operation of the offset cylinder 24.25 causes the roll frame unit 6 to move in the width direction ( The offset amount of the small-diameter work roll 5 with respect to the upper and lower rolls 9 and 10 can be adjusted by moving it with respect to the traveling direction of the plate. In the figure, 26 indicates a bending cylinder for the intermediate roll 9, and 27 indicates a roller table.

As described above, the roll frame unit 6 in which the small-diameter work roll 5 is housed in the frame 1 is constructed, and this is incorporated into a multi-plate rolling mill, and the roll frame unit 6 is configured to be shiftable and offset. Since the pressure wiL between the axle boxes 3 and 4 of the small-diameter work roll 5 can be shortened to the minimum, and its strength can be greatly increased, the diameter of the small-diameter work roll 5 can be further reduced to obtain a large rolling force. be able to.

That is, in the present invention, since the distance between the axle boxes of the small-diameter work roll 5 can be significantly shortened compared to the conventional distance f between axle boxes (see FIG. 8), the horizontal bending deflection ratio δ1/δ2=(f
/L) 1 horizontal bending stress σ1/σ2=(f/L>2), the roll strength and rigidity can be significantly increased.

In addition, the bending cylinder 15 applies a bending force to the frame 1 to bend the entire roll frame unit 6, thereby preventing the small diameter work roll 5 from bending horizontally and escaping due to the increase in roll strength. This allows stable bending to be performed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be applied to various work rolls that require reduction in diameter, that various configurations can be adopted for the bending device, and that the pond water Of course, various changes may be made without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the rolling mill of the present invention, a roll frame unit in which the work rolls are housed in the frame is configured, the roll frame unit is incorporated into the rolling mill housing, and the roll frame unit Since we have installed a bending device that bends the work roll, we have increased the strength and rigidity of the work roll by reducing its length to the necessary minimum, making it possible to reduce the diameter of the work roll and increasing the rolling force. It has an excellent effect of suppressing work roll escape and producing stable benzo ink.

[Brief explanation of drawings]

Figure 1 is a front view of the roll frame unit of the present invention, Figure 2 is a plan view of Figure 1, Figure 3 is a side view of Figure 1, and Figure 4 is a view of the roll frame unit of the present invention incorporating the roll frame unit. FIG. 5 is a side view showing an example of a rolling mill, FIG. 5 is a view taken along the line v-■ arrow □ in FIG. 4, FIG. 6 is a front view showing an example of a conventional multi-stage rolling mill equipped with small-diameter work rolls, and FIG. 8 is an explanatory diagram showing details of a conventional small-diameter work roll, and FIG. 8 is an explanatory diagram showing details of a conventional axle box. 1 is a frame, 2 is an opening, 3 and 4 are axle boxes, 5 is a small diameter work roll, 6 is a roll frame unit, 7.8 is a backing roll, 9 is an intermediate roll, 1o is a lower work roll, 11 is a slide beam, 12 is the housing, 13.14 is the shift door 0
15 is a bending cylinder, 16 is a pawl, 17 is a protrusion, 18 is a lock pole 1~. 19 is a lock plate,
20 is a hook, 21 is a rotating hook, 22 is a connecting member, 23
indicates a shift cylinder, and 24° and 25 indicate an offset cylinder.

Claims (1)

[Claims] 1) In a multi-high rolling mill, a roll frame unit that stores work rolls supported at both ends by an axle box in an integrated frame is incorporated into the rolling mill housing, and a bending force is applied to the frame. A rolling mill characterized in that it is equipped with a bending device as described above.