JPH03124302A - Rolling method - Google Patents

Abstract

PURPOSE:To eliminate a roll defect caused during rolling in a four way work roll rolling method, by offsetting a horizontal work roll couple or vertical work roll couple along the transfer pass of the material to be rolled in the specific quantity. CONSTITUTION:Vertical work rolls 13, 14 are offset in the specific quantity (l) so that the perpendicular 16 passing the center axial line thereof is located at the transfer pass downstream side of the material W to be rolled from the center axial line 15 of horizontal work rolls 11, 12. When the material W to be rolled is fed to a four way work roll rolling mill, the material W becomes rolled with its abutment on the vertical work rolls 13, 14 after its abutment on the horizontal work rolls 11, 12 first. In that case, the first abutting horizontal rolls 11, 12 are directly rotated and driven and so no roll defect is caused. Also the horizontal work rolls 11, 12 may be offset to the transfer pass upper stream side of the material W for the vertical work rolls 13, 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling method for rolling a material to be rolled, such as a heat-opened rectangular material, using four-sided work rolls.

In order to prevent problems such as corners, scratches, folds, and center edges of the strained heat-exposed open rectangular material, four work rolls are used to
A rolling mill in which the directions are simultaneously constrained has been known for a long time.
This is configured, for example, as shown in FIG. 2.3.

That is, a pair of upper and lower horizontal work rolls 1.2 are rotationally driven by a driving member (not shown), and a pair of left and right vertical work rolls 3.4 are pressed against the surface of the horizontal work roll 1.2, and the friction force causes the horizontal work rolls 1.2 to be rotated. It is designed to be rotated.

However, in the case of the conventional four-way work roll rolling mill, (1) the vertical line 5 passing through the center axes of the horizontal work rolls 1 and 2 overlaps with the center axis 6 of the vertical work rolls 3 and 4; (2) The vertical work roll 3.4 is not directly driven as described above, but is indirectly driven and rotated by the horizontal work roll 1.2; (3) ) Since the vertical work roll 3.4 has a smaller diameter than the horizontal work roll 1.2, the tip of the material W to be rolled hits the vertical work roll 3.4 on the non-drive side first, causing damage during rolling. There is a problem in that roll defects (partial chipping of corners, denting of surfaces, etc.) occur during rolling, making it necessary to rearrange the rolls during rolling or to stop rolling.

As the cause of such problems.

The extent to which the tip of the material to be rolled first hits the vertical work roll 3.4 will be explained in more detail with reference to FIG. 4.

The material W to be rolled in the example shown in the figure has a length of 7 am), for example, a tube part whose tip end is tapered in the 11 direction.
The tip of this material W is attached to the vertical work roll 3.
．． The position corresponding to No. 4 can be found as the length L2 (20nwn) from the central axis 6 from the amount of one-sided rolling, but if Ll is taken into consideration, it becomes L2L + (207=13nwn). On the other hand, the position corresponding to the horizontal work roll 1.2 is determined by the length L from the perpendicular line 5 passing through the center axis of the horizontal work roll 1.2.
3 (11 mm). From the above, the prior position for the vertical work rolls 3 and 4 is L2-L3 (1
3-11=2 nun). In other words,
In the case of the material W to be rolled as described above, only two plates hit the vertical work rolls 3, 4 before the horizontal work rolls 1.2.

Therefore, the present invention solves the above-mentioned conventional problems and provides a rolling method that prevents the tip of the material to be rolled from first hitting the work roll on the non-driving side and eliminates roll damage. The purpose is to

= 4- In order to achieve the above object, the present invention provides the above-mentioned 4
In the horizontal work roll rolling method, by offsetting the horizontal work roll pair or the vertical work roll pair by a predetermined amount along the conveyance path of the material to be rolled, the leading end of the material to be rolled is placed before the pair of work rolls on the driving side. It is characterized by applying to

In the above, it is preferable that the horizontal work roll pair is on the driving side, and that the vertical work roll pair is offset by a predetermined amount to the downstream side of the conveyance path of the material to be rolled.

11 on the back JL5 Figure 1. +2 is conventional horizontal work roll 1
．． 13.14 is a pair of upper and lower horizontal work rolls similar to 2, and 13.14 is a pair of left and right vertical work rolls. The vertical work rolls 13 and 14 are offset by a predetermined amount so that a perpendicular line 16 passing through their center axes is located downstream of the center axis 15 of the horizontal work rolls I+ and 12 in the conveyance path of the material to be rolled W. This offset amount Q naturally depends on the dimensions of the material W, but is set, for example, in the range of 2IIw11 to 8 mm, taking into consideration L2-L3 (2 mm), which is determined as the initial contact position to the vertical work roll.

Therefore, when the material W to be rolled is sent to the four-way work roll mill, the material W is first rolled by the horizontal work roll +1.12
After hitting the vertical work rolls 13 and 14, the roll is rolled, but since the horizontal work rolls 11 and 12 that are directly rotationally driven first hit the rolls, roll defects may occur. Never happened.

Although in the above embodiment the vertical work rolls 13,14 were offset, an alternative method is to offset the horizontal work rolls o-/l/11.
．． 12 may be offset to the upstream side of the conveyance path of the material to be rolled W with respect to the vertical axis C1/L/13.14. Further, although the horizontal work rolls are directly driven, various design changes are possible in implementation, such as the vertical work rolls may be directly driven.

The present invention is as described above, and by offsetting the pair of horizontal work rolls or the pair of vertical work rolls by a predetermined amount along the conveyance path of the material to be rolled, the leading end of the material to be rolled is brought to the drive side. Since the work rolls are first applied to a pair of work rolls, it is possible to completely eliminate roll defects that occur during rolling in conventional four-way single roll mills. Therefore,
It is possible to maintain smooth and stable rolling operations over a long period of time without having to rearrange the rolls during rolling or stop rolling as in the conventional method.

Moreover, especially in the case of claim 2, since the vertical work roll, which normally has a smaller diameter than the horizontal work roll, is offset, manufacturing is easy and inexpensive.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a front view showing an example of a typical conventional four-way rolling mill, Fig. 3 is a side view thereof, and Fig. 4 is a side view showing an example of the present invention. These are schematic diagrams shown for analysis of problems in the conventional example, in which (A) is an enlarged plan view of a vertical work roll section, and (B) is an enlarged side view of a horizontal work roll section. 11.12...Horizontal work rolls 13, 14...Vertical work rolls 15...Perpendicular line 16...Central axis line Q...Offset amount W...Material to be rolled -7=8- (A ) Band 4M (B)

Claims (1)

[Claims] 1. A pair of upper and lower horizontal work rolls, and a pair of left and right vertical work rolls disposed in pressure contact with the surface of the horizontal work rolls, and these horizontal work roll pairs and the vertical work rolls. In a four-way work roll rolling method in which either one of the pairs is rotationally driven and the other is rotated by receiving this drive by the frictional force caused by the pressure welding, the horizontal work roll pair or the vertical work roll pair is rotated. A rolling method characterized in that the tip of the material to be rolled is first brought into contact with the pair of work rolls serving as the driving side by offsetting the material to be rolled by a predetermined amount along the conveyance path of the material to be rolled. 2. The rolling method according to claim 1, wherein the horizontal work roll pair is on the drive side, and the vertical work roll pair is offset by a predetermined amount to the downstream side of the conveyance path of the material to be rolled.