JPH0534086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of lubrication in a multi-stage cluster rolling mill that can be applied to a multi-stage cluster rolling mill having split back-up rolls.

Upper and lower work rolls 01 and 02 as shown in FIGS. 1 and 2, and an upper support roll for the work rolls,
A set of two lower intermediate rolls 03, 04, and a plurality of upper and lower reinforcing rolls 05, which support the intermediate rolls.
In a conventional multi-stage cluster rolling mill in which upper and lower reinforcing rolls 06, 07, 05a, 06a, and 07a are arranged symmetrically, a plurality of upper and lower reinforcing rolls 05, 06, 0
7, 05a, 06a, and 07a are each divided into a plurality of pieces and rotatably disposed on one roll axis in the longitudinal direction of the intermediate rolls 03 and 04, and are inserted in the direction of the arrow. The treated plate material A is
A rolling pressure is applied to each of the plurality of reinforcing roll shafts 08 (pushing pressure is applied to the lower part), and the material is rolled and released by the upper and lower work rolls 01 and 02.

In this case, the upper and lower divided reinforcing rolls are 0
5, 06, 07, 05a, 06a, 07a, a set of two on the left and right, upper and lower intermediate rolls 03,
As shown in Fig. 3, the contact surface pressure between the rolls is concentrated on both ends of each divided reinforcing roll, and when operated for a long time, the outer circumferential surface of each intermediate roll is , a striped roll mark M is generated at the contact portion with both ends of each reinforcing roll, and the work rolls 01 and 02 in contact with this mark M are
Moreover, the striped roll marks M on the outer peripheral surface of the work roll caused striped scratches and differences in gloss on the front and back surfaces of the rolled material A, significantly degrading the quality of the product.

The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and is intended to eliminate streak-like scratches and gloss differences caused by roll marks that occur on the front and back surfaces of rolled products in a multi-stage cluster rolling mill capable of high-pressure rolling. The purpose of this is to improve the shape control effect more than before.

In order to achieve this object, the present invention provides a pair of upper and lower work rolls, a pair of upper and lower intermediate rolls that support the work rolls, and a plurality of reinforcing rolls that support the intermediate rolls in a vertically symmetrical manner. Alternatively, in a high-pressure multi-stage cluster rolling mill arranged only on one side, the reinforcing roll is divided into a plurality of parts and rotatably arranged on one roll shaft, and the biting part between the reinforcing roll and the intermediate roll is In a multi-stage cluster rolling mill that is capable of rolling under high pressure and is configured with an oil supply pipe for forcibly supplying lubricating oil for rolling to the biting part between the roll and the work roll, the back-up roll, intermediate roll, and intermediate roll are used. By forcibly supplying rolling lubricating oil to the biting parts of each roll and work roll, uneven flatness of the contact part due to uneven contact pressure between the rolls,
It is characterized by preventing local thermal expansion and roll abrasion due to uneven temperature of each part of the roll, and therefore preventing extremely complicated roll marks and sheet shape defects that appear as a result of combining these factors. It is something to do.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an embodiment of the present invention. By the way, in recent years, from the viewpoint of improving productivity and saving energy, there is a demand for high-reduction rolling mills that can reduce the thickness of the plate by a large amount in one rolling process, and there are also demands for plate thickness accuracy and shape. It is also becoming increasingly strict.

In such high-reduction rolling mills, high-reduction rolling that tends to cause deflection of work rolls, plate thickness accuracy,
There is a problem in that there are conflicting factors such as the requirement to maintain the shape, and it has been extremely difficult to realize a rolling mill that can perform high reduction rolling with excellent shape control. There is a multi-stage cluster rolling mill that enables this cold rolling under high pressure. However, multi-stage cluster rolling mills with split back-up rolls have had problems with roll marks.

Now, in FIG. 4, a pair of upper and lower work rolls 2, 2a and a set of two upper and lower intermediate rolls 31, 32, 31 supporting the work rolls 2, 2a are shown.
a, 32a and the intermediate rolls 31, 32, 31
a, 32a, a plurality of reinforcing rolls 41,
In a multi-stage cluster rolling mill in which 5, 42, 41a, 5a, and 42a are arranged vertically symmetrically or only on one side, when the reinforcing roll is made into a split type, the part where the split reinforcing roll is present and the part where the split reinforcing roll is not present are determined. To prevent a belt-like striped pattern that occurs on the outer peripheral surface of the intermediate roll due to the difference between the parts and the same striped pattern on the front and back surfaces of the rolled material from causing a significant deterioration in product quality. For this purpose, a lubricating pipe 9a is installed at the biting part of the intermediate roll 31 in contact with the work roll 2, and a lubricating pipe 9b is installed in the biting part of the intermediate roll 32, and also a lubricating pipe 9b is installed at the biting part of the intermediate roll 31 in contact with the reinforcing roll 41. An oil supply pipe 10a is installed at the biting part between the reinforcing roll 42 and the intermediate roll 32, and an oil supply pipe 10b is installed at the biting part between the reinforcing roll 42 and the intermediate roll 32, and a lubricating oil for rolling is supplied between the rolls from an oil supply pump 11 (not shown) in the roll rotation direction. The contact surface between each roll is coated with an oil film, which prevents thermal expansion due to uneven temperature of the rolls, as well as roll wear and oil stains.

In addition, oil supply pipes 9a, 9b, 10a, 10b
etc. may be provided branching off from an existing line for the purpose of supplying lubricating oil between the plate and the work rolls and cooling each roll, or may be provided as a separate system from the existing line.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional multi-stage cluster rolling mill, Fig. 2 is a sectional view taken from X to X in Fig. 1, Fig. 3 is a stress distribution diagram applied to the intermediate roll, and Fig. 4 is an embodiment of the present invention. FIG. 2 is a side sectional view of a multi-stage cluster rolling mill. Explanation of the main parts of the figure, 2, 2a... Work roll, 31, 32, 31a, 32a... Intermediate roll, 41, 5, 42, 41a, 5a, 42a...
Reinforcement roll, A...Rolled material.

Claims (1)

[Claims] 1. A multi-stage cluster under high pressure in which a pair of upper and lower work rolls, a pair of upper and lower intermediate rolls that support the work rolls, and a plurality of reinforcing rolls that support the intermediate rolls are arranged vertically symmetrically or only on one side. In the rolling mill, the reinforcing roll is divided into a plurality of pieces and rotatably arranged on one roll axis,
A lubrication method for a multi-stage Tarastar rolling mill, characterized by installing oil supply pipes for forcibly supplying rolling lubricating oil to the biting part between the reinforcing roll and the intermediate roll and the biting part between the intermediate roll and the work roll. .