JPS6368205A - Roll profile variable rolling mill - Google Patents

Abstract

PURPOSE:To change the crown amt. of back-up rolls and to control sheet crown by feeding and discharging oil to and from back-up rolls through axially divided plural oil grooves formed between the arbor and sleeve of said rolls. CONSTITUTION:The oil is supplied only to the oil groove 6-3 at the time of rolling a rolled stock having a narrow width. On the other hand, the oil is fed to all of the oil grooves 6-1, 6-2, 6-3, 6-4, 6-5 if the rolled stock is broad. The axial contact length l1 of the rolled stock 3 with work rolls 2 and the axial contact length l2 of the back-up rolls 1 and the work rolls are thereby made approximately equal to each other. The easy control of the crown is permitted by the device constituted in the above-mentioned manner.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a variable roll profile rolling mill, and particularly to a VC rolling mill.
Variable crown roll
The present invention relates to a rolling mill using a roll as a pick-up roll.

(Prior art) Conventionally, V
C-roll is used.

The VC roll 100 is attached to the arbor 101 as shown in FIG.
A sleeve 102 is fitted around the arbor, an oil groove 103 is formed between the arbor 101 and the sleeve 102, this oil groove 103 and a hydraulic device 104 are connected via a rotary joint 105, and oil is supplied to the oil groove 103. The crown of the roll is changed by supplying and discharging the roll.

Further, there is a four-high mill shown in FIG. 8 as a rolling mill using the above-mentioned VC roll. This four-tier mill is provided with VC rolls 100, 100 as backup rolls on the outside of a pair of work rolls 106, 106.
, 100 to roll the work rolls 106, 106 to the material 1
07 and passes between the work rolls 106, 106 to roll the rolling material 107.

As shown in FIG. 8, the axial length of the contact surface 108 between the workpiece slot 106 and the rolling material 107 is approximately equal to the axial length of the contact surface 109 between the VC roll 100 and the work roll 106. If they are equal, by increasing the roll crown amount of the VC roll 100, the roll flattening deformation due to contact with the rolled material 107 of the work roll 106 as shown in FIG. 9, and the work roll as shown in FIG. It is possible to correct the deflection of the rolled material 106 and reduce the amount of plate crown of the rolled material 107.

(Problems to be Solved by the Invention) As described above, the work roll 106 and the rolled material 107
When the axial contact length between the VC roll 100 and the work roll 106 is approximately equal, the plate crown amount can be reduced, but as shown in FIG. The width of work roll 1 is small.
When the axial contact length between the VC roll 100 and the work roll 106 is shorter than the axial contact length between the VC roll 100 and the work roll 106, the harmful contact surface 110 increases in the area surrounded by the dotted line in FIG. However, even if the roll crown amount of the VC roll 100 is increased, the bending force applied from the contact surface 110 causes flattening deformation of the work roll 106 and the work roll 10.
6 cannot be corrected, and the effect of controlling the plate crown of the rolled material is small.

Therefore, an object of the present invention is to provide a variable roll profile rolling mill that can effectively control the plate crown of a rolled material regardless of the width of the rolled material.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a rolling mill equipped with a backup roll and a work roll, in which an oil groove is formed between the backup roll and the arbor and the sleeve. A VC roll is used, and the oil groove is further divided in the axial direction, and each of the divided oil grooves is independently connected to a hydraulic device.

(Function) The present invention supplies oil to a predetermined oil groove among the divided oil grooves according to the plate width of the rolled material by the above means, and improves the axial contact length between the work roll and the rolled material and the backup. The axial contact length between the roll (VC roll) and the work roll is made equal, and the plate crown of the rolled material is adjusted.

(Example) Hereinafter, an example of a rolling mill according to the present invention will be described based on the accompanying drawings.

FIG. 1 is a front view of a rolling mill (four-high mill) according to the present invention, and the rolling mill has a pair of upper and lower backup rolls 1, 1.
and work rolls 2, 2, the work roll 2.2 is pressed against the rolled material 3 by the backup rolls 1, 1, and the rolled material 3 is rolled (plastically deformed) by passing between the work rolls 2.2. That's what I do.

As shown in FIG. 2, the backup roll 1 is
A sleeve 5 is fitted around the arbor 4 which is the roll shaft,
A plurality of oil grooves 6-1°6-2.6-3.6-4 are divided in the axial direction between the outer circumferential surface of the arm 4 and the circumferential surface of the sleeve 5.
6-5 is formed.

Each of these oil grooves independently communicates with the hydraulic device 9 via an oil passage 7 bored in the arbor 4 (in the illustrated example, only the oil passage 6-3 is shown) and a rotary joint 8. are doing.

When using a rolling mill as described above, the axial contact length between the backup roll 1 and the work roll 2 is changed depending on the width of the rolled material 3.

That is, when rolling a rolled material 3 with a narrow plate width, the oil is supplied only to the oil groove 6-3, and as shown in FIG. 3, the axial contact length Ω1 of the rolled material 3 with the work roll 2 is and,
The axial contact length g of the backup roll 1 and the work roll 2 is made to be approximately equal, and when rolling a rolled material 3 with a large plate width, the oil grooves 6-1.6-2.6-
As shown in FIG. The directional contact length g2 should be approximately equal,
Furthermore, when rolling a material with a medium width, the oil groove 6
-2.6-3゜6-4, and as shown in Fig. 5, the axial contact length Ω1 of the rolling material 3 with the work roll 2 and the axial contact between the backup roll 1 and the work roll 2. The length g2 is made to be approximately equal.

By doing as described above, the harmful contact area between the backup roll 1 and the work roll 2 is reduced, and the effect of controlling the plate crown is increased regardless of the plate width of the rolled material 3.

Further, the number of oil grooves divided in the axial direction can be arbitrarily selected.As shown in FIG. 6, seven oil grooves 6-1, 6-2, 6-3.
6-4.6-5.6-6°6-7 may be formed, and the central oil groove 6-4 may be set longer than the other oil grooves.

〔Effect of the invention〕

As explained above, according to the present invention, a VC roll is used as a backup roll of a rolling mill, and the oil groove of this VC roll is divided in the axial direction so that oil can be supplied and discharged independently to each oil groove. Therefore, the profile of the backup roll, that is, the amount of crown and the crown length in the axial direction can be changed according to the sheet width of the rolled material, and therefore the sheet crown of the rolled material can be easily controlled.

[Brief explanation of the drawing]

Fig. 1 is a front view of the rolling mill according to the present invention, Fig. 2 is a sectional view of the backup roll, Figs. 3 to 5 are diagrams showing rolling methods according to the sheet width, and Fig. 6 is the backup roll. FIG. 7 is a cross-sectional view of a conventional VC roll, FIG. 8 is a front view of a rolling mill using a conventional VC roll, and FIGS. 9 and 10 show rolling materials and workpieces. FIG. 11, which is a diagram showing the relationship with the rolls, is a diagram showing the drawbacks of the conventional rolling mill. 1... Backup role, 2... Work role,
3... Rolled material, 4... Arm, 5... Sleeve, 6-1.6-2.6-3.6-4.6-5°6-6.
6-7...Oil groove. Applicant's agent: Ome Sato 1st page 2nd page 3rd page Figure 4 5th figure 8 Figure 9 弗 10th figure 11th page

Claims (1)

[Claims] In a rolling mill in which a work roll is brought into pressure contact with a rolling material by a backup roll, the backup roll is provided with a sleeve around an arbor, and a plurality of oil grooves divided in the axial direction are formed between the arbor and the sleeve. , a variable roll profile rolling mill characterized in that each of these oil grooves is independently connected to a hydraulic power source.