JP2930470B2 - Work roll chock position stabilizer for work roll cloth rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a work roll crossing mill in which upper and lower work rolls are crossed with each other and upper and lower backup rolls are parallel to each other. Related to a device for causing

[0002]

2. Description of the Related Art FIG. 4 is a side view showing a main part of a conventional work roll cross rolling mill for crossing upper and lower work rolls.
FIG. 5 is a conceptual plan view showing a cross between upper and lower work rolls and a force (hereinafter, referred to as a crotch tearing force) for increasing a cross angle generated by the cross. In both figures,
51 is an upper work roll, 52 is a lower work roll,
Both ends are pivotally mounted on an upper work roll chock 55 and a lower work roll chock 56 supported by an entrance crosshead 61 and an exit crosshead 62 in a housing 60.

An upper shaft 65 is a right-hand screw, and a lower shaft 67 is a left-hand screw. The nuts 66 and 68 are screwed into the inlet side A and the outlet side B of the housing 60, respectively. 61 and the exit side crosshead 62 are rotatably connected. The motor is rotated via a shaft 64 and a worm speed reducer 63 by a motor (not shown). Reference numeral 71 denotes a hydraulic cylinder, which is provided inside the entry-side crosshead 61, and a block 74 is attached to the tip of a rod 73.

[0006] The rotation of the upper and lower shafts 65 and 67 moves the entrance crosshead 61 and the exit crosshead 62 to the entrance A or the exit B, respectively, so that the upper work roll chock 55 and the upper work roll 51 and the lower work roll 51 are moved. The roll chock 56 and the lower work roll 52 are rotated around the center point (cross point) O in the roll axis direction in a direction opposite to each other at a required cross angle θ to cross each other.
To roll.

[0005] During rolling, the block 74 is moved up and down by the respective hydraulic cylinders 71 and the upper and lower work roll chocks 55 and 56.
The upper and lower work roll chocks 55,5
6, pressed with vertically movable pressure for bending the upper and lower work rolls 51 and 52, to prevent vibration in the horizontal direction perpendicular to the roll axis direction of the upper and lower work roll chocks 55 and 56 due to the occurrence of the crotch tear force F _M ing.

[0006]

In hot rolling, continuity has not yet been achieved, and the rolled material 50 is bitten into the rolling mill at high speed for each charge, so that the upper and lower work rolls 51, 52 Vibration in the horizontal direction perpendicular to the roll axis direction is remarkable, and due to this vibration, the horizontal force acting on the upper and lower work roll chocks 55 and 56 is much larger than the horizontal force acting during rolling 4 to 8 times. become. Further, the work roll cross rolling mill for cross only vertical work rolls 51 and 52, the crotch tear force F _M to be generated between the upper work roll 51 and lower work roll 52, upper work roll 51 and upper backup roll 53 between, and since crotch tear force F _M is added, which is generated between the lower work roll 52 and lower backup roll 54, the sum of the crotch tear force F _M acting respectively on the upper and lower work rolls 51 and 52 mighty It becomes something. When such a work roll cross rolling mill is used for hot rolling, when the rolling mill 50 bites,
And a horizontal force are combined by the vibration crotch tear force F _M, the horizontal force on the drive side D and the working side W does not act in phase.
When the horizontal force is greater than the pressing force of the hydraulic cylinder 71, the amplitude of the vibration increases, and the cross angle θ changes in a different phase between the working side W and the driving side D. Since the roll gap fluctuates, a large plate shape defect such as a plate wedge occurs.

[0007]

In order to solve the above-mentioned problems, the construction of the present invention is to provide a method in which the upper and lower work rolls and the upper and lower work roll chocks are moved by a roll cross direction supporting member so that the roll axis is parallel to the rolled plate surface. In a work roll cross rolling mill that crosses so as to cross each other at a required cross angle, between one of the side surfaces on the entrance side or the exit side of the upper and lower work roll chocks and the roll cross direction supporting member, A roll cross direction pressing means having a back limit stroke limited to a length equal to or less than a length corresponding to a cross angle variation allowable value is provided.

[0008]

[Function] The upper and lower work roll chocks and the upper and lower work rolls are moved in a plane in which the roll axis is parallel to the surface of the rolled plate by moving the roll cross direction support members on the entrance side and the exit side in the horizontal direction orthogonal to the roll axis direction. The upper and lower work roll chocks are raised and lowered for bending of the upper and lower work rolls by the roll cross direction pressing means on either side of the entrance or exit side of the upper and lower work rolls. Pressing with a pressing force that can be performed.

When the upper and lower work rolls at the leading end of the rolling mill are engaged with each other and a horizontal force in the opposite direction greater than the pressing force acts on the upper and lower work roll chocks, the roll cross direction pressing means retreats by losing the horizontal force. When this horizontal force becomes unstable, the upper and lower work roll chock moves or vibrates in the horizontal direction perpendicular to the roll axis direction, but the amplitude is limited by the back limit stroke of the roll cross direction pressing means, and the cross angle of the upper and lower work rolls is changed. Is suppressed below the allowable value.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. The same members and parts as those of the conventional device are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a side view showing a main part of a work roll cloth rolling mill according to a first embodiment of the present invention, and FIG. 2 is an enlarged side view of a main part of FIG. In both figures, reference numeral 1 denotes a hydraulic cylinder, which is housed in each entry-side crosshead 21, and a block 4 is attached to the tip of a rod 3. The back of the plunger 2 and the hydraulic cylinder 1
A back limit stroke S corresponding to the variation allowable value of the cross angle θ is provided between the input side cross head 2 and the head side.
1 is smaller than the gap a between the upper and lower work roll chocks 55 and 56 on the side of the entry side A.

The upper and lower shafts 65 and 67 are rotated by the motor shaft 64 and the worm speed reducer 63 to move the entrance-side crosshead 21 and the exit-side crosshead 62, and the upper work roll chock 55 and the upper work roll 51 The lower work roll chock 56 and the lower work roll 52 are rotated in opposite directions about the cross point O to cross the upper and lower work rolls 51 and 52 at a required cross angle θ.

Next, the block 4 is pressed by the hydraulic cylinder, the plunger 2 and the rod 3 at a pressure at which the upper and lower work rolls 55 and 56 can move up and down for bending of the upper and lower work rolls 51 and 52, and the rolling mill is pressed. The tip of 50 is engaged with the upper and lower work rolls 51 and 52. At this time, when a horizontal force in the opposite direction greater than the pressure acts on the upper and lower work roll chocks 55 and 56, the plunger 2 retreats to the entry side A by losing the horizontal force. Roll chock 5
5 and 56 move or vibrate in the horizontal direction orthogonal to the roll axis direction, but limit the amplitude thereof to the length of the back limit stroke S or less, and allow the cross angle θ of the upper and lower work rolls 51 and 52 to vary. Suppress below the value.

FIG. 3 is an enlarged side view of a main part of a work roll cloth rolling mill according to a second embodiment of the present invention. In this second embodiment, as a roll cross direction pressing means, a rod 12 to which a block 4 is fixed, and a rod 12 fixed to the rod 12 and housed in an entry-side crosshead 21 are freely movable in a horizontal direction orthogonal to the roll axis direction. It comprises a cup-shaped stopper 13 which slides, and a disc spring 11 interposed between the inner surface of the stopper 13 and the rod 12, and is provided between the entrance A of the stopper 13 and the entrance crosshead 21. A back limit stroke S is formed.

The pressing force of the disc spring 11 on the block 4 is adjusted so that the upper and lower work roll chocks 55 and 56 can be raised and lowered, and operates in the same manner as in the first embodiment.

[0016]

According to the present invention, the back limit stroke is provided in the roll cross direction pressing means for pressing either the entrance side or the exit side of the upper and lower work rolls. Even if the upper and lower work roll chocks move or vibrate in the horizontal direction perpendicular to the roll axis direction, the amplitude can be suppressed to a value equal to or less than the allowable cross-angle variation of the upper and lower work rolls. Therefore, it is possible to reduce a plate shape defect such as a plate wedge of a rolled material due to a change in a roll gap near both ends of the upper and lower work rolls to an allowable value or less.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a work roll cloth rolling mill according to a first embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of the first embodiment.

FIG. 3 is an enlarged side view of a main part of a work roll cloth rolling mill according to a second embodiment of the present invention.

FIG. 4 is a side view showing a main part of a conventional work roll cloth rolling mill.

FIG. 5 is a conceptual plan view showing a cross angle and a crotch tearing force of upper and lower work rolls.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic cylinder 2 Plunger 3 Rod 4 Block 11 Disc spring 12 Rod 13 Stopper 21 Entry crosshead 50 Rolling machine 51 Upper work roll 52 Lower work roll 53 Upper backup roll 54 Lower backup roll 55 Upper work roll chock 56 Lower work roll chock 62 Out Side crosshead A Inlet B Outlet S Back limit stroke θ Cross angle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 1 / 22,13 / 14 B21B 31 / 02,31 / 16

Claims (1)

(57) [Claims] A work in which upper and lower work rolls are crossed together with an upper and lower work roll chock so that their roll axes cross each other at a required cross angle in a plane parallel to a rolled plate surface by moving a roll cross direction support member. In the roll cross rolling mill, between any one of the side surfaces on the entrance side or the exit side of the upper and lower work roll chocks and the roll cross direction support member, the length is limited to a length corresponding to the allowable value of the cross angle or less. A work roll chock position stabilizing device for a work roll cross rolling mill, comprising roll cross direction pressing means having a back limit stroke.