JPH07132303A - Horizontal mill - Google Patents

Abstract

PURPOSE:To obtain a mill having a simple crossing mechanism and a large controllability by containing a piston rod abutting on upper and lower work roll chock through a housing and providing a strong bender between the chocks and the housing. CONSTITUTION:The crossing mechanism 15 is on the side facing the housing 17 of the upper work roll chock 16 supporting both end face parts of the upper work roll 11. Crossing cylinders 18 are formed before and behind the advancing direction L of a rolled stock and the front end of each piston rod 19 connecting with a piston abutts on the inside face of the window of each housing 17. The extruder output of the rod 19 is adjusted by the charge or discharge of working fluid and the rotation axis of the upper work roll 11 can be crossed into an angle theta to the rectangular direction of the advancing direction L of the rolled stock. Three hydraulic cylinders 20 as strong benders are provided respectively on the side between each housing 17 and the corresponding upper work roll chock 16 to give a large bending force to each chock 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal rolling mill for crossing only upper and lower work rolls.

[0002]

2. Description of the Related Art One of the methods for controlling the cross-sectional shape of rolled products with high accuracy is to change the clearance distribution between rolls by slightly crossing the upper and lower work rolls in the horizontal plane in the direction perpendicular to the traveling direction of the rolling mill. There is a method to do this, and it is put to practical use as a cross mill.

In order to realize this cross mill, a roll cross mechanism is required. For example, as shown in FIG. A guide hole 6 in which a worm jack 4 is attached and a pusher bar 5 reciprocated by these worm jacks 4 is formed in the housing 3.
The work roll 1 is slightly reciprocated (angle θ) with respect to the direction perpendicular to the rolling material traveling direction L in the horizontal plane by reciprocating along the pusher bar 5 against the chock liner 8 on the side surface of the roll chock 7. I have to.

Further, in the conventional cross mills, in order to eliminate generation of thrust force between the upper and lower work rolls and the upper and lower work rolls supporting the work rolls, these upper and lower work rolls are also arranged in parallel with the rotation axis of the work rolls. It has been put to practical use as a pair cross mill designed to cross at the same angle.

Further, a vendor (not shown) may be provided between the housing 3 and the roll chock 7 for crown control.

[0006]

However, in the cross mechanism 2 for realizing the cross mill, the housing 3 is used.
Since it is necessary to form the guide hole 6 of the pusher bar 5 and the like, it becomes complicated and large in size. Especially, it is necessary to modify the existing horizontal rolling mill to the work roll cloth method in order to manufacture mechanical parts or to stop the operation. There was a problem in that it was very difficult. Further, the vendor for crown control is about 75 tons at maximum for one roll chock 7, and there is a problem that the crown control capability cannot be enhanced.

The present invention is intended to solve the above problems. That is, the present invention has a simple work roll crossing mechanism, can be easily applied to an existing rolling mill, and can be easily attached to a strong bender to increase crown control capability. However, it is an object of the present invention to provide a horizontal rolling mill in which the quality of rolled material is improved.

[0008]

In order to achieve the above object, the present invention provides a horizontal rolling mill in which only the upper and lower work rolls are crossed in the horizontal plane with respect to the direction perpendicular to the traveling direction of the rolled material. Each chock has a built-in cross cylinder, and the tip of the piston rod of the cylinder is in contact with the housing so that the work roll can be crossed. Between the housings,
It has a strong vendor.

[0009]

According to the present invention, in a horizontal rolling mill in which only the upper and lower work rolls are crossed in the horizontal plane with respect to the direction perpendicular to the traveling direction of the rolled material, a crossing cylinder incorporated in each chock of the upper and lower work rolls is provided. Moreover, since the tip of the piston rod of the cylinder is in contact with the housing, the work roll can be accurately crossed by adjusting the amount of expansion and contraction of each piston rod. Further, since a strong bender is provided between each of the chocks and the housing, a large bending force can be applied to each roll chock, and the crown control capability is increased.

[0010]

1 and 2 show an embodiment of the present invention. FIG. 1 is a partially cutaway plan view mainly showing an upper work roll, and FIG. 2 shows an arrangement of each roll. It is a front view.

That is, as shown in FIG. 2, the horizontal rolling mill 10 is composed of a four-high rolling mill and is provided with an upper work roll 11, a lower work roll 12, an upper backing roll 13 and a lower backing roll 14. The upper and lower work rolls 11 and 12 in contact with the rolled material (rolled plate) W are configured as a work roll cross mill capable of roll crossing. The upper and lower work rolls 11 and 12 are respectively provided with the same cross mechanism. Here, the cross mechanism 15 of the upper work roll 11 shown in FIG. 1 will be described as an example.

In this cross mechanism 15, a cross cylinder 18 is formed on the side surface of the upper work roll chock 16 which supports both ends of the upper work roll 11 facing the housing 17 and which opens in the front-back direction of the rolling material advancing direction L. The tips of the piston rods 19 connected to the pistons come into contact with the inner surface of the window of the housing 17, respectively, and the amount of extrusion by the rods 19 is controlled by the supply and discharge of the working fluid from a working fluid supply device (not shown). The rotation axis of the upper work roll 11 can be adjusted to slightly cross (angle θ) with respect to the direction perpendicular to the rolling material traveling direction L.

In FIG. 1, reference numeral 20 is a hydraulic cylinder of a strong bender, which will be described later, and is attached to a bracket 21 provided on the housing 17.

In this horizontal rolling mill 10, the cross mechanism 15
The roll cylinder 16 for the cross cylinder 18
Since it is built in the housing 17, it is not necessary to perform any processing on the housing 17, only the simple processing on the roll chock 16 side is required, and the cross mechanism 15 can be easily manufactured.
Even when modifying an existing rolling mill into a cross mill, it can be easily handled by modifying only the roll chock.

Therefore, according to the horizontal rolling mill 10, the structure is simple and the piston rod 19 is
The cross angle can be set with high precision by expanding and contracting, and the ability to control the plate crown is increased compared to the conventional pair roll cross mill.

As shown in FIG. 1, between the housing 17 and one side of the upper work roll chock 16, three hydraulic cylinders 20, 20, 20 as strong benders are provided for each side of the chock 16. There is. The hydraulic cylinder 2
Since 0 has a performance of giving a bending force of 75 tons with one cylinder, it is a strong bender having a performance of 225 tons when the three cylinders 20, 20, 20 are added together.

As for the lower work roll 12 shown in FIG. 2, the upper work roll 1 is vertically symmetrical with respect to the rolled material W.
It has a hydraulic cylinder as a strong vendor with the same structure as the one strong vendor.

FIG. 3 is a side view showing the relationship between the upper work roll 11 and the hydraulic cylinder 20. In FIG. 3, the upper work roll chock 16 is given an upward bending force as indicated by an arrow 22 by the hydraulic cylinder 20 in order to cause the upper work roll 11 to perform incremental bending.

This will be described with reference to the front view of FIG. 4. Since the upper and lower work rolls 11 and 12 are crossed and the upper and lower holding rolls 13 and 14 (see FIG. 2) not shown are straight, the upper work The roll 11 bends convexly downward by the bending force indicated by the arrow 22. At this time, the central portion of the upper work roll 11 and the central portion of the upper backing roll 13 are in contact with each other over a very small area as if they were point contacts, and the upper work roll 11 is moved from the upper backing roll 13 to the arrow 23
Since it receives the reaction force indicated by, it is much easier to bend than in the case of the pair roll cross mill. Further, the lower work roll 12 also vertically bends symmetrically with respect to the rolled material W, because a force similar to that of the upper work roll 11 acts on it.

FIG. 5 shows the upper work roll 11 in order to perform a bending of the decrease.
The downward force indicated by the arrow 24 is applied to the outer end side of the upper work roll chock 16 and the upward force indicated by the arrow 25 is applied to the inner end side of the upper work roll chock 16 by a hydraulic cylinder of a strong bender (not shown). There is. As a result, the upper work roll 11 bends upwardly. The lower work roll also bends downwardly symmetrically when a force similar to that of the upper work roll 11 is applied to the rolled material (not shown) vertically symmetrically.

In FIG. 6, the vertical axis y is the work roll crown control amount (μm), and the horizontal axis P is the bending force (ton) per roll chock, showing the control capability. And + y is the increment side and -y is the decrease side. The solid curve in the figure shows the crown control ability of the work roll cross mill, and the dotted curve shows the crown control ability of the pair cross mill.

From FIG. 6, the bending force P on the horizontal axis is 20.
The controlled variable + y or -y rapidly increases before reaching 0 tons.

From this, the bending force P is 200
The crown control capability Cr1 of the work roll cross mill at the time of ton is the length (height) of the straight line connecting the points A1 and A4, while the crown control capability Cr of the pair cross mill is Cr.
2 is the length (height) of the straight line connecting the points A2 and A3,
It is clear that the work roll cross mill has better crown control capability.

As described above, in the horizontal rolling mill according to the combination of the work roll crossing mechanism and the strong vendor shown in FIGS. 1 to 5, the work rolls 11 and 12 have a simple crossing mechanism, and 11, 12
There is a gap between the two ends due to the cross, and the waiting roll 1
Since 3 and 14 do not interfere, a powerful bender of 200 tons or more can be easily combined, and the crown control capability can be increased.

[0025]

As described above, according to the present invention,
A horizontal rolling mill for crossing only upper and lower work rolls in a horizontal plane in a direction perpendicular to the traveling direction of a rolled material, having a crossing cylinder incorporated in each chock of the upper and lower work rolls, and a piston rod of the cylinder. Since the tip end of the work piece is in contact with the housing, the work roll can be accurately crossed by adjusting the expansion and contraction amount of each piston rod. Moreover, since the structure is simple and the work roll cloth creates a gap between both ends of the work roll and both ends of the backup roll, it becomes easy to combine strong benders, and each work can be easily combined. A large bending force can be applied to the roll chock, and the crown control ability is increased.

[Brief description of drawings]

FIG. 1 is a plan view mainly showing an upper work roll according to an embodiment of the present invention.

FIG. 2 is a front view showing an outline of roll arrangement of a horizontal rolling mill according to an embodiment of the present invention.

FIG. 3 is a side view showing the relationship between the upper work roll of FIG. 1 and a strong vendor.

FIG. 4 is a front view showing a state in which the upper work roll of FIG. 1 is subjected to incremental bending.

FIG. 5 is a front view showing a state in which the upper work roll of FIG. 1 is bent by a decrease.

FIG. 6 is an explanatory diagram showing crown control capability.

FIG. 7 is a plan view showing an example of a conventional technique.

[Explanation of symbols]

 10 Horizontal Rolling Machine 11, 12 Work Roll 15 Cross Mechanism 16 Upper Work Roll Chock 17 Housing 19 Piston Rod 20 Hydraulic Cylinder of Strong Vender W Rolled Material

Claims (2)

[Claims] 1. A horizontal rolling mill for crossing only upper and lower work rolls in a horizontal plane with respect to a traveling right-angle direction of a rolled material, having a cross cylinder incorporated in each chock of the upper and lower work rolls, and The tip of the piston rod of the cylinder is in contact with the housing so that the work roll can be crossed, and further, between the respective chocks and the housing,
A horizontal rolling mill characterized by having a strong vendor. 2. A strong vendor has two roll chocks per roll.
The horizontal rolling mill according to claim 1, which has a performance of giving a bending force of 00 tons or more.