JPS5831241B2 - Pair-cross type 4-high rolling mill - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in a pair-cross type four-high rolling mill.

In recent years, demands on the thickness accuracy of rolled products in the Iiyama direction have become increasingly strict.Currently, this is countered by attaching an initial crown to the roll that cancels the deflection of the roll due to the rolling load. When rolling conditions such as Iiyama and thickness change, it is necessary to replace the roll with a roll with a different crown, so it is necessary to have rolls with many different types of initial crowns, and it is also necessary to change the In addition, due to roll wear and thermal expansion as the rolling process progresses, the crowning effect of the rolls changes significantly, so it has traditionally been the case that the rolling mill operation rate is reduced without replacing the rolls. There has been a demand in the industry for a means to control the thickness profile in the Iiyama direction.

As a control method for this, a work roll bending method has been developed and has been shown to be quite effective, but the strength of the work roll shaft limits the amount of pending force that can be obtained, so the ability to modify the shape is not sufficient. Particularly when the width of the rolling mill is narrow relative to the length of the roll, there is a problem in that the contact areas with the work roll at both ends of the backup roll get in the way and are almost ineffective.

Therefore, there has been a strong desire in the industry for a rolling mill that can freely control the thickness profile in the Iiyama direction according to changes in rolling conditions while using the same roll.

Next, rolls, especially work rolls, are subject to severe wear during rolling operations, so they need to be replaced frequently.Moreover, conventionally, rolls are threaded so that the center of the roll coincides with the center of the roll length, so the center of the roll The rolls wore out faster than the ends, and the rolls were replaced when the amount of wear in the center of the roll reached a certain limit.

As a result, the ends of the rolls need to be replaced even if the wear limit has not yet been reached, resulting in a short life span and a high number of replacements.As a result, the operating rate of the rolling mill decreases and losses due to roll wear are large, resulting in high product quality. The impact on costs was also significant.

The present applicant has improved the drawbacks of the conventional device as described above,
It is described in the specification (including drawings) of Japanese Patent Application No. 54-59328 as a new rolling mill that can control a wide range of thickness and shape using the same roll, and can extend the life of the roll by more than double that of conventional rolling mills. We have previously proposed the rolling mill shown below.

(Refer to Fig. 1) This rolling mill is a four-high rolling mill in which one upper and lower inner housing is disposed inside the housing, and a work roll chock and a backup roll chock are disposed as guides on the vertical inner wall of the inner housing. A gap is provided between the inner wall and the outer wall of the inner housing, and a jack for pushing the inner housing disposed in the housing, means for separately setting left and right roll gaps, and a hydraulic jack for roll bending are provided. By adjusting the housing pushing jacks, the upper pair of work rolls and backup rolls and the lower pair of work rolls and backup rolls can be made to intersect at the required angles with respect to the line perpendicular to the rolling direction. This makes it possible to achieve the above-mentioned purpose.

However, in this proposal, the upper work roll and backup roll pair and the lower work roll and backup roll pair are adjusted to the required positions with respect to a line perpendicular to the rolling direction by adjusting the jack for pushing the inner nozzle. When intersecting the angle, the center point of the top inner housing and the center position of the reduction screw will be relatively shifted in the horizontal direction, and a bending moment will be generated on the reduction screw depending on the amount of deviation, which will have an adverse effect on the reduction screw. effect.

Similarly, since the center point of the bottom inner housing and the center position of the hydraulic pressure reduction cylinder are relatively shifted in the horizontal direction, a bending moment is also generated in the hydraulic pressure reduction cylinder, which has a structural drawback in that it has an adverse effect on the hydraulic pressure reduction cylinder. Ta.

The present invention was proposed for the purpose of eliminating the drawbacks of the above-mentioned four-high rolling mill, and includes one upper and lower inner housing inside the housing of the pair-cross type four-high rolling mill. , one upper and lower equalizer beam is provided that abuts on the upper and lower surfaces of the inner housing and can be raised and lowered in the vertical direction, as well as a work roll chock and backup that are raised and lowered using the vertical inner wall of the inner housing as a guide. A roll chock is installed, and the above-mentioned
・An appropriate gap is provided between the inner wall of the housing and the outer wall of the inner housing, and a means is provided for separately setting the inner housing pushing jack disposed in the housing and the left and right roll gaps of the upper and lower work rolls. The present invention relates to a pair-cross type four-high rolling mill characterized by the following.

Further, the present invention provides an upper and a lower inner housing inside the housing of a pair-cross type four-high rolling mill, and the upper and lower inner housings are in contact with the upper and lower surfaces of the inner housing and can be raised and lowered in the middle and lower directions. In addition to disposing equalizer beams, a work roll chock and a backup roll chock are disposed that move up and down using the vertical inner wall of the inner housing as a guide, and a gap is provided between the inner housing wall and the outer wall of the inner housing. , above... In a pair cross type 4-high rolling mill equipped with an inner housing pushing jack installed in the housing and a means for separately setting the left and right roll gaps of the upper and lower work rolls, the axis of the work rolls is This invention relates to a pair-cross type four-high rolling mill characterized in that a work roll bending device is provided at the end.

The present invention will be specifically explained below with reference to embodiments shown in FIGS. 2 to 4.

In those figures, 1 is a rolled plate material rolled by a pair of upper and lower work rolls 2°2', and these work rolls 2 and 2' are supported by work roll chocks 6 and 6'. Backup roll 3, 3 attached to '
' is supported by a backup roll chock 7.7'.

Furthermore, a pair of screw lowering devices 11 (means for separately setting the left and right gaps of the upper and lower work rolls 2, 2') are provided at the top of the housing 8, which are interconnected by a shoe plate 9, and are equipped with a lowering screw 4. is established,
A hydraulic pressure reduction cylinder 10 is provided at the bottom of the housing 8 as shown.

Inner housings 12 and 12' are provided inside the housing 8 with a gap therebetween so as to be able to move up and down and freely rotate around a vertical axis.
Backup roll chocks 7.7' are installed inside the housings 12, 12' so as to be able to slide up and down, and roll bending is installed between the ends of the inner housings 12, 12' and the ends of the work roll chocks 6.6'. A hydraulic jack (roll bending device) 5 is installed.

Equalizer beams 2L are provided between the top inner housing 12 and the reduction screw 4 and between the bottom inner housing 12' and the hydraulic reduction cylinder 10, respectively.
21' is disposed such that it can be raised and lowered vertically and is restrained to the inner wall of the housing so that it cannot move horizontally.

Furthermore, a plurality of pairs of inner housing pushing jacks 13a are provided on both lateral sides of the housing 80.

13b, 13c, and 13d, and on the top of the housing 8, there is provided an inner housing balance cylinder 15 having a lifting rod 14 for suspending the top inner housing 12.

Further, the work rolls 2, 2' are supported by a work roll chock 6.6' via a radial bearing 16, and one end of the work rolls 2, 2' is supported by a thrust support fitting 18 via a thrust bearing 17. The thrust bracket 18 is a chock plate 19 and the inner housing 12
．． It is attached to 12'.

(See Figure 4). In addition, 20 in the figure is a jack receiver for the inner housing pushing jacks 13a, 13b, 13c, and 13d.

Furthermore, the symbols 1.2.2', 3.3'4.5 in the figure
, 6.6', 7.7', 8.9.10°11.
12, 12' 513a-d, etc.
The four-high rolling mill proposed above has the same members as those shown with the same reference numerals in FIG. Almost the same.

One embodiment of the bare-cross type four-high rolling mill of the present invention is constructed as described above, and is
The line is the center line of the sheet width, and the X-X line is a straight line passing through the center of the roll length and parallel to the sheet threading line ■-■.
If the Y line is a straight line perpendicular to the X-X line, and the intersection of the threading line ■-■ and the straight line Y-Y is W, then calculate the weight of the inner housing pushing jacks 13a, 13b, 13c, and 13a. By operating these jacks respectively by the amount that the inner housing 12.12'
rotates around an arbitrary point W on the Y-Y line, and
The upper and lower rolls 2.2' and 3°3' form a pair and each rotate by α0.

In addition, by appropriately operating the left and right screw lowering devices 11, the initial roll angle ε1°ε2 is adjusted, and by appropriately operating the roll bending hydraulic cylinder 5, the roll pending force F1. F
2 is adjusted.

In this way, in the present invention, rotation angle α0, initial roll gap ε ε roll pending force F1 ゜1 j
2) By appropriately adjusting F2, the cross-sectional shape of the rolled sheet material 1 in the sheet width direction can be adjusted over a wide range.

Further, since the upper roll pair 2°3 and the lower roll pair 2', 3' can intersect at point W, the crown effect of the rolls can be made equal for all left and right sides.

Since the bare cross type four-high rolling mill of the present invention has the above-described configuration and operation, according to the present invention, the cross-sectional shape of the rolled plate material can be controlled over a wide range, and Since it is possible to roll at the end of the roll, it is possible to grind the roll into a roughly cylindrical shape, which not only makes it possible to increase the reassembled interval of the rolls and the total rolling tonnage to more than double that of the conventional method. Each roll 2.2', 3.3'
Because a cylindrical roll without a crown can be used, the cost for manufacturing and repolishing the roll is much lower than that of a roll with a crown, which is a practical effect.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a four-high rolling mill previously proposed by the applicant, and FIGS. 2 to 4 are schematic illustrations of an embodiment of the present invention, and FIG. 2 is a front view. , FIG. 3 is a side view, and FIG. 4 is a sectional view taken along the line IV--IV in FIG. 2. 1: Rolled plate material, 2.2': Work roll, 3°3':
Backup roll, 4: Reduction screw 5: Roll pending device (hydraulic jack for roll bending)
, 6.6': Work roll chock, 7.7': Backup roll chock 8: Housing, 10: Hydraulic reduction cylinder, 11 Niscrew reduction device, 12.12
': Inner housing, 13a, 13b, 13c, 1
3a: Inner housing push jack, 21.21
': Equalizer beam ε, ε2: Gap. ) 1

Claims (1)

[Scope of Claims] 1. Inside the housing of a pair-cross type four-high rolling mill, one upper and lower inner housing is provided, and the upper and lower inner housings are in contact with the upper and lower surfaces of the inner housing and are movable up and down in the vertical direction. In addition to disposing equalizer beams, a work roll chock and a backup roll chock are disposed that move up and down using the vertical inner wall of the inner housing as a guide, and an appropriate gap is provided between the inner housing wall and the inner housing outer wall. A pair-cross type 4-stage, characterized by having a jack for pushing the inner housing disposed on the housing, and a means for separately setting the left and right roll gaps of the upper and lower work rolls. rolling machine. 2 Inside the housing of the pair-cross type 4-high rolling mill,
One upper and lower inner housing is provided, which contact the upper and lower surfaces of the inner housing, and can be raised and lowered in the vertical direction.In addition, one equalizer beam is provided on the upper and lower sides, and the vertical A work roll chock and a backup roll chock are disposed that move up and down using the inner wall as a guide, and an appropriate gap is provided between the inner wall of the housing and the outer wall of the inner housing, and an inner housing pushing jack is disposed on the housing;
A pair-cross type four-high rolling mill comprising means for separately setting the left and right roll gaps of the upper and lower work rolls, characterized in that a work roll bending device is provided at the shaft end of the work rolls. Pair-cross type 4-high rolling mill.