JPS6342522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a roll cross rolling mill.

In a conventional rolling mill in which the upper and lower roll groups are always held orthogonal to the rolling direction, the circumferential speed VR of the work rolls and the advancing speed Vs of the rolled material are almost equal,
The thrust force T in the axial direction is not generated on the work roll, or even if it is generated, it is very small, and the slip VT in the axial direction is very small. Therefore, the frictional force in the rolling force direction due to the thrust force T is small, the hysteresis of the rolling force is small, and the plate thickness control is not adversely affected. For this reason, the sliding type shown in Figure 1 is used for the tip clamp mechanism. In FIG. 1, 1 is a work roll or backup roll, 2 is a roll chock integrally provided on the roll 1, 3 is a housing, and 4 is a clamp that is opened and closed in the direction of the arrow by a hydraulic cylinder 5 when changing rolls. The clamp plate 4 prevents the roll 1 from moving in the roll axis direction due to the thrust force T. If the coefficient of friction of the chock clamp sliding portion is μ, then the frictional force F in the direction of the rolling force due to the thrust force T can be determined by the following formula: F=μ×T. Since the chock clamp mechanism shown in FIG. 1 is a sliding type, the friction coefficient μ is sliding friction and is large, but since the thrust force T is small, the overall frictional force F in the direction of the rolling force is small from the equation. Incidentally, the friction coefficient μ=0.1~0.2,
If the thrust force T=(0.01~0.015)P (where P: rolling force), the frictional force F in the direction of the rolling force is F=(0.001~0.003)P..., which is small.

In response to this, the applicant has already proposed a roll cross rolling mill (see Japanese Patent Application Laid-Open No. 55-64908),
and rolling method (see JP-A-55-153605)
As shown in Fig. 2, the roll jocks of rolls 1a and 1b are displaced in the rolling direction, and the roll axes (see broken lines) are crossed in a horizontal plane with respect to an imaginary line (see dashed line) perpendicular to the rolling direction. , rolled material 6
The circumferential speed VR of the rolls 1a, 1b and the advancing speed of the rolled material 6 differ from Vs by an amount corresponding to the cross angle θ, and the rolls 1a, 1b have a slip VT in the axial direction. As a result, a large thrust force T is generated, so the frictional force F in the direction of the rolling force due to the thrust force T is large, and the hysteresis of the rolling force becomes large. Therefore, when the chock clamp mechanism shown in FIG. 1 was adopted, there was a problem in that it had an adverse effect on plate thickness control.

The present invention addresses the above-mentioned problems in a roll cross rolling mill in which rolling is performed by displacing the roll chock of the roll in the rolling direction and making the roll axis cross in a horizontal plane with respect to an imaginary line perpendicular to the rolling direction. Roll cross rolling, characterized in that it has a rolling friction sliding device that supports the thrust force generated in the roll axis direction, and the roll chock is supported so as to be movable in the rolling force direction via the rolling friction sliding device. The purpose of this invention is to provide an improved roll cross rolling mill that does not adversely affect plate thickness control.

Next, the roll cross rolling mill of the present invention will be explained with reference to an embodiment shown in FIG.
is a choke liner provided on the roll chock 2, 8 and 8' are pusher bars, 9 and 9' are pusher guides, and 10 and 10' are worm jacks, and when the worm jacks 10 and 10' are operated by equal amounts in opposite directions, the movement is Pushshaba 8,
8' to the roll chock 2, so that the axis of the roll 1 crosses an imaginary line perpendicular to the rolling direction. Reference numerals 11 and 11' denote chock clamp plates 1 and 1 mounted on the pusher guides 9 and 9' so as to be movable in the direction of the arrow.
2 and 12' are wheels attached to the roll chock 2 via the rolling bearing 13, and the roll chock 2 is connected to the pusher guides 9 and 9' and the chock clamp plates 11 and 11' via the wheels 12 and 12' and the rolling bearing 13. It is supported between the cylinders and can move in the direction of the rolling force. Also 5,5'
is a hydraulic cylinder that opens and closes the chock clamp plates 11, 11' when changing the rolls.

4 and 5 show that rolling bearings 13, 13' are interposed between the roll chock 2, pusher guides 9, 9', and chock clamp plates 11, 11', so that the roll chock 2 can be moved in the direction of the rolling force. This is another embodiment supported by the following.

The roll cross rolling mill of the present invention has grooves as described above, and the frictional force F in the direction of the rolling force is lower than that of the conventional rolling mill. That is, the frictional force F in the direction of the rolling force is determined by the formula, but the friction coefficient μ is made small as the rolling friction coefficient, so even if the thrust force T is large, the overall frictional force F in the direction of the rolling force is small. . Incidentally, the rolling friction coefficient μ = 0.005 to 0.01,
When the thrust force T=(0.04-0.05)P, the frictional force F in the direction of the rolling force is: F=(0.0002-0.0005)P..., which is less than the conventional (see formula). Therefore, when the roll moves in the direction of the rolling force, the hysteresis that affects the rolling force is reduced, and there is an effect that the plate thickness control is not adversely affected.

Note that if the cross angle θ is set to θ=0, the rolling mill becomes a conventional rolling mill, so it goes without saying that the present choke clamp mechanism can be applied to the conventional rolling mill.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional chock clamp mechanism, Fig. 2 is an explanatory diagram of the operation of a roll cross rolling mill already proposed by the applicant, and Fig. 3 is an implementation of the roll cross rolling machine according to the present invention. FIG. 4 is a plan view showing another embodiment, and FIG. 5 is a longitudinal sectional side view taken along the arrow line in FIG. 4. 1...Roll, 2...Roll check, 13...
...Rolling friction sliding device.

Claims (1)

[Claims] 1 In a roll cross rolling mill that displaces the roll chock of the roll in the rolling direction and performs rolling by crossing the roll axis in a horizontal plane with an imaginary line orthogonal to the rolling direction, the thrust force generated in the roll axis direction is supported. It has a rolling friction sliding device,
A roll cross rolling mill characterized in that the roll chock is supported movably in the direction of rolling force via a rolling friction sliding device.