JPS60108107A - Lubricating method in multi-cluster mill - Google Patents

Abstract

PURPOSE:To eliminate streaky flaws and gloss unevenness generating in a rolled product by dividing a backup roll into plural ones and supplying a rolling lubrication-oil to respective interroll biting parta of backup rolls, intermediate rolls, and work rolls. CONSTITUTION:A multi-cluster mill is formed by disposing a pair of work rolls 2, 2a upper and lower intermediate rolls, two-in-a-set each, 31, 32, 31a, 32a, and plural backup rolls 41, 42, 41a, 42a for supporting the intermediate rolls. Oil supplying pipes 9a, 9b are installed at biting parts between the work roll 2 and the intermediate rolls 31, 32, and oil supplying pipes 10a, 10b are installed at biting parts between the backup rolls 41, 42 and the intermediate rolls 31, 32. Oil supplying pipes 9c, 9d, 10c, 10d are disposed in the same manner at respective interroll biting parts of the lower side. A rolling lubrication-oil is focibly supplied from respective oil supplying pipes in conformity with the rotating directions of respective rolls, to prevent the partial expansion, wear, and oil burning of the roll.

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 hack-up rolls.

Upper and lower work rolls 01 as shown in FIGS. 1 and 2.
02, a set of two upper and lower intermediate rolls 03.04 that support the same work roll, and a plurality of upper and lower reinforcing rolls 05.06.07.05a, 06a that support the same intermediate roll.
In a conventional multi-stage cluster rolling mill in which upper and lower reinforcing rolls 05.0 and 07a are arranged symmetrically,
6, 07.05a, 06a, and 07a are each divided into a plurality of pieces in the longitudinal direction of the intermediate roll 03.04 and rotatably disposed on one roll axis, and rotate in the direction of the arrow. The loaded processed plate material A is applied with rolling pressure (upward pressure on the lower part) to each of the plurality of reinforcing roll shafts 08, is rolled by the upper and lower work rolls 01.02, and is discharged.

In this case, upper and lower divided reinforcing rolls 05.06.
As shown in Fig. 3, the contact surface pressure between the rolls is on the contact surfaces of the upper and lower intermediate rolls 03.04, which are in contact with 07.05 a, 06 a, and 07 a, respectively. It becomes concentrated at both ends between the divided reinforcing rolls, and when operated for a long time, streak-like roll marks M are generated on the outer circumferential surface of each intermediate roll at the contact area with both ends of each reinforcing roll. , the work roll 01.0 that this mark M is in contact with
2, 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 rolling mill A, significantly degrading the quality of the product.

The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and in a multi-stage cluster rolling mill capable of high reduction rolling,
The purpose is to eliminate streak-like tin and gloss differences caused by roll marks that occur on the front and back surfaces of rolled products, and 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 workpiece rolls, two intermediate rolls each for upper and lower sides that support the same work roll, and a plurality of reinforcing rolls that support the same intermediate roll. In a high-pressure multi-stage cluster rolling mill arranged symmetrically or only on one side, the reinforcing roll is divided into a plurality of parts and rotatably arranged on one roll axis, and one indentation part between the reinforcing roll and the intermediate roll is formed. The multi-stage cluster rolling mill, which is capable of rolling under high pressure, is equipped with an oil supply pipe for forcibly supplying rolling lubricating oil to the biting part between the intermediate roll and the work roll. By forcibly supplying rolling lubricating oil to the biting parts of the intermediate roll and work roll, it is possible to prevent uneven flatness of the roll contact area due to uneven contact pressure between the rolls and the temperature of each part of the roll. It is characterized by preventing local thermal expansion and roll abrasion due to non-uniformity of the roll, and therefore preventing extremely complicated roll marks and poor shape of the plate that appear as a result of the combination of these factors.

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. is becoming increasingly strict.

Such high-reduction rolling mills have the problem of having contradictory factors: high-reduction rolling, which tends to cause deflection of the work rolls, and requirements for sheet thickness accuracy and shape maintenance. It has been considered extremely difficult to realize a rolling mill that can carry out rolling. There is a multi-stage Clasp rolling mill that enables this cold rolling under high pressure. However, multistage cluster rolling mills with split bank-up rolls have had roll mark problems.

Now, in Fig. 4, a pair of upper and lower work rolls 2.2a
, a pair of upper and lower intermediate rolls 31.32.31a, 32a that support the work roll 2.2a, and a plurality of reinforcing rolls 41.5.42 that support the intermediate roll 31.32.31a132a. .41a, 5a, 42a,
In a multi-stage flannel rolling mill that is installed vertically symmetrically or only on one side, if the reinforcing rolls are split, it can be done in minutes! Due to the difference between the part 6) where the I sleeve cuff roll exists and the part where it does not exist, a band-like striped pattern is created on the outer circumferential surface of the intermediate roll, which in turn creates a similar striped pattern gloss difference on the front and back surfaces of the rolled 4A, In order to prevent the quality of the product from significantly deteriorating, a lubricant pipe 9a is installed at the part where the work roll 2 and the intermediate roll 31 engage, and an oil supply pipe 9b is installed at the part where the intermediate roll 32 engages. In addition, the oil supply pipe 10a is attached to the biting part of the intermediate roll 31 in contact with the reinforcing roll 41, and the intermediate roll 32 in contact with the reinforcing roll 42
An oil supply pipe lOb is installed at the biting part between the rolls, and a lubricating oil for rolling is forcibly supplied between the rolls from an oil supply pump 11 (not shown) in accordance with the direction of rotation of the rolls to form an oil film on the contact surface between each roll. This prevents thermal expansion caused by uneven temperature of the roll, as well as roll wear and oil staining.

Note that the oil supply pipes 9a, 9b, 10aS, 10b, etc. may be provided branching off from the existing line for the purpose of supplying lubricating oil between the plate and the work rolls and cooling each roll, or may be provided in conjunction with the existing line. It may be a separate system.

[Brief explanation of the drawing]

- Figure 1 is a side sectional view of a conventional multi-stage cluster rolling mill;
The drawings are a sectional view taken along the line XX in FIG. 1, FIG. 3 is a stress distribution diagram applied to an intermediate roll, and FIG. 4 is a side sectional view of a multi-stage Clasp rolling mill showing an embodiment of the present invention. Description of the main parts of the figures 2.2a - Work rolls 31.32.31a, 32a - Intermediate rolls 41.5.
42.41a, 5a', 42a - Reinforcement roll A - Rolling month

Claims (1)

[Claims] 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 push rolls are arranged vertically symmetrically or only on one side. In the rolling mill, the reinforcing roll is divided into a plurality of 111J and rotatably arranged on one roll shaft, and the reinforcing roll is placed in the biting part between the reinforcing roll and the intermediate roll and the biting part between the intermediate roll and the work roll. For rolling 4
71 Lubricating oil strong Rr! A lubrication method for a multi-stage Clasf rolling mill, characterized in that an oil supply pipe for lubricating is installed.