JPS5847501A - Rolling mill - Google Patents

Abstract

PURPOSE:To prevent the deviated abrasion of roll surfaces in rolling mills having variable crown rolls by making work rolls movable and adjustable in the axial direction of rolls. CONSTITUTION:Fluid pressure is supplied from an oil hydraulic power unit 9 to a clearance 7 between the sleeve 5 and arbor 6 of a variable crown roll 4 as a backup roll and the rate of the roll crown is changed by regulating the fluid pressure arbitrarily, whereby the sectional shape of a rolled material 1 is controlled with work rolls 2. Further the rolls 2 are movable and adjustable in the axial direction (arrow 12 direction) of the rolls. Thus the contact areas between the upper, lower work rolls 2 and the material 1 are properly changed to make the wear of the surfaces of the rolls 2 uniform over roughly the entire width of the barrel length of the rolls, whereby the deviated abrasion on the roll surface and the excessive abrasion generating in the end part of the material 1 are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for reducing the wear of rolling rolls caused by rolled materials in rolling mills and rolling mills. This invention relates to an improvement of a rolling mill that is capable of controlling the cross-sectional shape of rolled material in consideration of the industry.゛Various rolling mills have been devised in the past that can control the cross-sectional shape of straight-arc products, one of which is a rolling mill that has a so-called variable crown roll that can arbitrarily change the amount of crown of the roll. . These all relate to rolls that can be changed arbitrarily by fluid pressure, and are composed of a roll sleeve and a 7-pa, and are formed between the sleeve and the shank. The amount of four crowns can be changed by injecting high pressure oil into the space where the four crowns are formed and causing three 1tm. In addition, by applying a pending force to the roll end bearing box by a hydraulic cylinder, the roll and axis center 'ti
A four wheel equipped with a roll bending device that can change the amount of crown by bending the crown is manufactured as a known example. In terms of roll strength, the above-mentioned slip type variable crown roll is mainly used as a reinforcing roll for 4R rolling mills. Used for straight arc machine work and reinforcing rolls, all with straight arc accuracy O
This rolling mill has been devised as a rolling mill that can fully exert the effect of modifying the cross-sectional shape. “However, this
No consideration has been given to countermeasures against wear of the rolling mill 4 or the surface of the work roll in direct contact with the rolling mill IIK. When rolling a rolled material using the 4@t or 6-high grinding machine mentioned above in 41, when rolling a large amount of rolled material with a constant plate width (lot), the work p - Only in the part corresponding to the plate width, abnormal wear (hereinafter referred to as uneven wear) 3 occurs in the part corresponding to the plate width, and in addition, in the part that contacts the end of the rolled material, excessive wear occurs. Therefore, it is necessary to grind the surface of the work roll 2 by ΔD shown in the Kgi diagram for subsequent pressure-sanding. In addition, K indicates that the stepped portion 2' of the opening 1-rule caused by the uneven wear 3 of the work roll 20 is affected by other rolls, for example, in the case of a 4' high rolling mill, the reinforcing roll K,
In the case of a 6-high rolling mill, it is transferred to the intermediate rollers and reinforcing rollers, and surface grinding of these rollers is also required. For this reason, the frequency of roll grinding has increased, and the rolling tonnage in the roll disposal trench has decreased, which has seriously worsened the unit consumption of the roll. Conventional rolling mills with variable crown rolls, such as Jin, are rolling mills that have the effect of controlling the cross-sectional shape of the rolled material, but they do not take into account the various work-roll wear countermeasures mentioned above. , Diagram 2 shows an example of a 4-high rolling mill adapted to a sleeve-type variable roll roll and upper and lower reinforcing rolls, where 1 is a rolled material, 2 is a work roll, 4 is
is a reinforcing roll, 5 is a sleeve, 6a7-pa, 7 is a gap,
8 is an oil hole, 9 is a hydraulic power unit, arrow 10 is a direction in which the reinforcing roll 3 is rolled down by a rolling down device (not shown), arrow 1
Reference numeral 1 indicates a direction in which a roll balance and roll shape control device (not shown) K causes the upper and lower work rolls 2 to move away from each other, and a direction in which a roll balance and roll penting force is applied. This rolling mill is constructed by providing a space in the center of the mating surfaces of the sleeve 5 and the aperture 6 of the sleeve-type variable crown coolant as a reinforcing roll.
form.

By applying fluid pressure from the hydraulic power unit 9 to this space 7 through the oil hole 8, the outer circumference of the sleeve 5 is
The purpose is to control the cross-sectional shape of the rolled material 1 through two working seals by elastically deforming the material 1t and changing the amount of roll crown by arbitrarily adjusting the fluid pressure.

However, as shown in FIG. 2, in such conventional rolling mills having variable collage rolls, the work rolls 2 are not adjustable in movement in the roll axis direction, so the rolling material lt- When rolling a lot, the first
As shown in the figure, it is not possible to prevent uneven wear and wear 3 on the roll surface corresponding to the width of the rolled material 1 and excessive wear 3' on the part that contacts the edge of the rolled material, and such work The roll is
For the subsequent rolling, the roll wai is set by ΔD shown in Fig. 1.
It becomes necessary to perform t-grinding, which seriously worsens the unit consumption of the roll.

The present invention eliminates the drawbacks of conventional rolling mills having variable crown rolls, and prevents uneven wear and excessive wear on the upper side of the roll by equalizing the wear on the surface of the roll due to the rolling material. This was proposed for the purpose of improving the four-roll unit consumption, and its purpose is to develop a rolling mill KTh with variable crown rolls that can arbitrarily adjust the amount of the four-roll crown. , it is assumed that a mechanism for adjusting the movement of the work roll in the roll axis direction is provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The rolling mill according to the present invention will be described below based on the embodiments shown below.

The third cabinet shows an example of Tei-tei.

This shows a rolling mill having a variable crown roll shown in 111t2flJK in which the work roll 2 of the rolling mill can be moved and adjusted in the roll axis direction. Made! The roll can be adjusted to move in the roll axis direction using a hydraulic, mechanical, or other appropriate control mechanism (not shown). Note that many proposals have already been made regarding the movement adjustment mechanism for the work roll 2, so a description thereof will be omitted, and the same members as those in FIG.

In the four-high rolling mill according to this embodiment, the sleeve 5 of the variable crown roll 4 as a reinforcing roll is used during the rolling operation.
And Arpa 6's full 117Km pressure Iguwarenit 9
By supplying fluid pressure and arbitrarily adjusting the hydraulic pressure pipe, the amount of crown can be changed, and the cross-sectional shape of the rolled material can be controlled via the work rolls 2. The vertical work roll 2 can be adjusted to move in the roll axis direction (arrow 12 direction) K. For this reason, the contact area between the upper and lower working I-rules 2 and the rolled material 1 can be changed as appropriate, so in FIG. As shown in (2), @) and C)K, move the upper and lower work rolls in the axial direction and change the relative position with respect to the rolled material IK from right to left for the upper work roll, and from right to left for the lower work roll. By sequentially shifting from left to right (it is of course possible to move the upper and lower work rolls 2 in the same direction of the roll axis), the surface of the work roll 2 can be adjusted to the length of the roll body. It can be worn uniformly over the entire width. Therefore, for work roll 2, the 111th
It is possible to prevent the uneven wear 3 of the roll ll1I surface that occurs only in the portion corresponding to the plate width of the rolled material 1 as shown in Figure 1, and the excessive wear 3' that occurs at the end of the rolled material 1, reducing the roll consumption rate. This will greatly contribute to the

As described above with reference to the embodiment shown in Figure INK, the present invention provides a rolling mill that improves the unit consumption of rolling rolls and has the function of modifying the cross-sectional shape of rolled material. In addition, as an example, the case of a rolling mill having a three-type variable crown roll as a reinforcing roll has been described, but the present invention can also be applied to a rolling mill having a variable crown roll having a roll bending device as a reinforcing roll. Needless to say.

[Brief explanation of drawings]

Figure j111 is a theory showing the case where uneven wear occurs in a rolling mill, Figure 2 and! Reference numeral 311 shows a pressure mat having three types of removable loungers, 211 is a conventional example, and FIG. 3 is an example of the present invention. Further, No. 411 is a diagram showing a case where the work roll is moved and adjusted in the axial direction in the rolling mill according to the present invention. In the figure, 1 is the rolled material, 2 is the work roll, 2' is the stepped part, 3 is uneven wear, 3' is excessive wear, 4 is the reinforcement roll, 5 is the sleeve, 6 is the aperture, 7 is the gap , 8 is the oil hole, and 9 is the hydraulic power unit. Patent Applicant Mitsubishi Heavy Industries, Ltd. Patent Attorney Sub-Attorney Shibu Mitsuishi (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 (A) (El) (C) f

Claims (1)

[Claims] A rolling mill having a variable crown roll capable of arbitrarily adjusting the amount of p-ruck, characterized in that it is equipped with a mechanism that allows the work roll to move in the axial direction of the roll. 6