JPH06114415A - Cross rolling mill - Google Patents

Abstract

PURPOSE:To uniformize the distribution of surface pressure between a work roll and a back-up roll by using a roll having minus crown as the back-up roll. CONSTITUTION:A solid roll 7 with minus crown whose diameter is smaller in the middle part 6 of the roll as compared to that in both end parts 5 is used as the back-up roll 4. The surface pressure in the middle part of the roll between the work roll 1 and the back-up roll 4 is decreased, the surface pressure in both the end parts 5 is increased, the distribution of surface pressure is uniformized in the axial direction 8 and it is unnecessary to impart high strength to the work roll 1 and back-up roll 4. And, since the distribution of surface pressure is uniformized in the axial direction, friction due to non-uniformity in the distribution of surface pressure is eliminated and the life of the rolls 1, 4 is prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross rolling mill.

[0002]

2. Description of the Related Art Recently, as shown in FIGS. 9 and 10, upper and lower work rolls 1 are rolled into a rolled material 2 in a plane parallel to the rolled material 2.
A cross-type rolling mill has been developed in which a high strip crown control capability can be obtained by inclining (crossing) to the opposite sides with respect to the width direction (direction orthogonal to the line direction 3) of the steel sheet (reference). (See JP-A-58-31241).

Reference numeral 4 is a normal backup roll which supports the work roll 1 from above and below and which has a uniform outer diameter in the cylinder length direction.

[0004]

However, the above conventional cross rolling mill has the following problems.

That is, since the work roll 1 is arranged to be inclined with respect to the backup roll 4, the surface pressure distribution between the work roll 1 and the backup roll 4 is as shown in FIG.
As shown in FIG. 1, since the central part of the roll becomes extremely high and both end parts of the roll become extremely low, the work roll 1 and the backup roll 4 need to have high strength so as to withstand a sudden change in the surface pressure. There is also a problem that the life of the roll is shortened because the central part of the roll is abraded intensively due to high surface pressure.

In view of the above situation, it is an object of the present invention to provide a cross rolling mill capable of making the surface pressure distribution between the work roll and the backup roll uniform.

[0007]

According to a first aspect of the invention, the upper and lower work rolls 1 supported from above and below by a backup roll 4 are defined with reference to the width direction of the rolled material 2 in a plane parallel to the rolled material 2. The cross rolling machine is characterized in that a roll 7 having a minus crown is used as the backup roll 4 in a cross rolling machine which is inclined to the opposite sides to cross each other.

The invention of claim 2 is the backup roll 4
Roll 7 with a minus crown used as
, Crown variable rolls 12, 25, 31, 37, 4
1, 46 is the cross rolling mill according to claim 1.

[0009]

The operation of the present invention is as follows.

In the cross rolling mill, by using the roll 7 having the minus crown as the backup roll 4, the surface pressure distribution between the work roll and the backup roll 4 is made uniform.

Further, the rolls 7 having a minus crown used as the backup rolls 4 are crown variable rolls 12, 25, 31, 37, 41, 46, so that the surface pressure distribution can be finely adjusted. Become.

[0012]

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

1 and 2 show a first embodiment of the present invention.

Further, in the figure, the same components as those in FIGS. 9 to 11 are designated by the same reference numerals and the description thereof will be omitted, and only the configuration unique to the present invention will be described below.

As the backup roll 4, a solid roll 7 having a minus crown whose diameter at the central portion 6 of the roll is smaller than that at both ends 5 is used.

Incidentally, 8 is the axial direction of the roll 7.

Next, the operation will be described.

The process of crossing the upper and lower work rolls 1 to obtain a high plate crown control capability is shown in FIGS.
The description is omitted because it is the same as.

In the present invention, since the backup roll 4 is a solid roll 7 having a minus crown, the central portion 6 of which has a smaller diameter than the end portions 5, is used.
Between work roll 1 and backup roll 4,
Since the surface pressure of the roll central portion 6 decreases and the surface pressure of both end portions 5 increases, the surface pressure distribution is made uniform in the axial direction 8 as shown in FIG. There is no need to give 4 high strength.

Further, since the surface pressure distribution between the work roll 1 and the backup roll 4 is made uniform in the axial direction 8, there is no portion that is intensively worn due to the uneven surface pressure distribution. The rolls 1 and 4 have a long life.

FIG. 3 shows a second embodiment of the present invention. As a backup roll 4, there is a tapered space 9 extending in the circumferential direction inside both ends 5, and the backup roll 4 slides in the tapered space 9. A ring-shaped taper piston 10, which is freely fitted,
A crown variable roll 12 in which 11 is moved in the axial direction 8 to change the wedge engagement degree of the tapered pistons 10 and 11 with respect to the tapered space 9 so that both ends 5 are expanded in diameter and the amount of the minus crown can be changed. Other than using
The same operation and effect as those of the above-described embodiment can be obtained except that the surface pressure distribution can be finely adjusted by providing the same configuration as that of the above-mentioned embodiment.

Reference numeral 13 is a roll core of the variable crown roll 12, 14 is a roll sleeve fitted onto the roll core 13, 15 is a ring-shaped closing plate for closing the tapered space 9 in a liquid-tight state, 16 , 17, 18 are hydraulic chambers formed between the tapered pistons 10, 11 and the closing plate 15 of the tapered space 9, and 19, 20, 21 are hydraulic chambers 16,
A liquid passage for supplying a pressure liquid to 17, 18 and a rotary joint 22 for connecting an external pressure liquid supply source (not shown) to the liquid passages 19, 20, 21.

FIG. 4 shows a third embodiment of the present invention, in which the backup roll 4 has a tapered space 23 inside the roll central portion 6 and is slidably fitted into the tapered space 23. By moving the combined taper piston 24 in the axial direction 8 to change the degree of wedge engagement of the taper piston 24 with respect to the tapered space 23, the roll central portion 6 is reduced in diameter, and the amount of minus crown can be changed. Except that the crown variable roll 25 is used, it has the same configuration as that of each of the above-described embodiments, and the same action and effect can be obtained.

Reference numeral 26 is a roll barrel of the variable crown roll 25, 27 is a roll shaft portion fitted to both ends of the roll barrel 26 to close the tapered space 23 in a liquid-tight state, and 28 and 29 are tapers of the tapered space. The hydraulic chambers are formed on both sides of the piston 24.

FIG. 5 shows a fourth embodiment of the present invention. As a backup roll 4, there is a hydraulic chamber 30 extending in the circumferential direction inside both end portions 5, and a hydraulic liquid is supplied to the hydraulic chamber 30. Except for using the crown variable roll 31 in which both ends 5 are expanded in diameter by supplying and discharging, and the amount of the minus crown can be changed, the same configuration as that of each of the above-described embodiments is provided, and the same operation and The effect can be obtained.

Reference numeral 32 is a roll core of the crown variable roll 31, 33 is a roll sleeve fitted on the roll core 32, 34 is a ring-shaped closing plate for closing the hydraulic chamber 30, and 35 is a hydraulic chamber. A liquid path for supplying a pressurized liquid to 30.

FIG. 6 shows a fifth embodiment of the present invention. As a backup roll 4, a hydraulic chamber 36 extending in the circumferential direction is provided inside the roll central portion 6, and the hydraulic chamber 36 has a hydraulic fluid. The crown central roll 6 is reduced in diameter by feeding and discharging, and the crown variable roll 37 in which the amount of the minus crown can be changed is used. The action and effect can be obtained.

Reference numeral 38 is a liquid passage for supplying a pressure liquid to the hydraulic chamber 36.

FIG. 7 shows a sixth embodiment of the present invention, in which a backup roll 4 has a parallel body portion 39 having uniform outer dimensions in the roll central portion 6 and both end portions 5 going to the end portion side. In addition to the use of the crown variable roll 41 in which the taper body 40 that expands in accordance with the axial direction is movable 8 and the amount of the minus crown can be changed by moving the taper body 40 in the axial direction 8, Also, since it has the same configuration as that of each of the above-described embodiments, the same action and effect can be obtained.

FIG. 8 shows a seventh embodiment of the present invention. As a backup roll 4, a rotary sleeve 43 is rotatably fitted around the outer circumference of a fixed roll core 42 and the work roll 1 of the fixed roll core 42 is mounted. By accommodating the crown changing cylinder 45 capable of projecting and storing the rod 44 in the portion on the contact line with, and changing the projecting amount of the rod 44 in the crown changing cylinder 45, the amount of the minus crown given to the rotary sleeve 43 is changed. Except for using the changeable crown variable roll 46, it has the same configuration as that of each of the above-described embodiments, and the same action and effect can be obtained.

The present invention is not limited to the above-mentioned embodiment, but the crown variable roll may be other than the above as the backup roll, and other various changes may be made without departing from the scope of the present invention. Of course, it can be added.

[0032]

As described above, according to the first aspect of the present invention, the upper and lower work rolls 1 supported by the backup roll 4 from above and below are provided with the width of the rolled material 2 in a plane parallel to the rolled material 2. In the cross rolling machine in which the directions are taken as the reference and the cross rolls are inclined to the opposite sides, the roll 7 having the minus crown is used as the backup roll 4. Therefore, the surface pressure distribution between the work roll and the backup roll is made uniform. The excellent effect of obtaining can be obtained.

According to the second aspect of the present invention, the roll 7 having the minus crown used as the backup roll 4 is replaced by the crown variable rolls 12, 25, 31, 37 ,.
Since it is set to 41 and 46, there is an excellent effect that the surface pressure distribution can be finely adjusted.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the distance from the center of the roll in FIG. 1 and the surface pressure.

FIG. 3 is a partially cutaway side view of a crown variable roll according to a second embodiment of the present invention.

FIG. 4 is a cutaway side view of a crown variable roll according to a third embodiment of the present invention.

FIG. 5 is a partially cutaway side view of a crown variable roll according to a fourth embodiment of the present invention.

FIG. 6 is a partially cutaway side view of a crown variable roll according to a fifth embodiment of the present invention.

FIG. 7 is a side view of a crown variable roll according to a sixth embodiment of the present invention.

FIG. 8 is a cutaway side view of a crown variable roll according to a seventh embodiment of the present invention.

FIG. 9 is a side view of a conventional example.

FIG. 10 is a front view of FIG. 9.

11 is a diagram showing the relationship between the distance from the center of the roll in FIGS. 9 and 10 and the surface pressure.

[Explanation of symbols]

1 Work roll 2 Rolled material 4 Backup roll 7 roll 12, 25, 31, 37, 41, 46 Crown variable roll

Claims (2)

[Claims] 1. The upper and lower work rolls 1, which are supported by a backup roll 4 from above and below, are tilted in opposite directions with respect to the width direction of the rolled material 2 in a plane parallel to the rolled material 2 so as to be crossed. In the cross rolling mill, a roll 7 having a minus crown is used as the backup roll 4, which is a cross rolling mill. 2. The cross rolling mill according to claim 1, wherein the roll 7 having a minus crown used as the backup roll 4 is a crown variable roll 12, 25, 31, 37, 41, 46.