JPH0536124B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field
It's about roles.

(B) Prior art A variable crown roll (hereinafter referred to as a VC roll) has a pressure chamber formed between an arbor and a sleeve, and a pressurized fluid (for example, water,
The crown of the roll is changed by supplying oil, grease, etc.), thereby controlling the cross-sectional shape (plate crown) or flatness (plate shape) of the rolled material.

Conventional VC rolls can effectively control the crown when the width of the rolled material is wide, but when the width is narrow, the amount of crown does not change much even if the fluid pressure is changed. An example is shown in FIG.

This is because the effective expansion width of the sleeve is designed with the maximum rolling width of the rolling mill in mind, so for narrow-width materials, due to the flexible structure of the sleeve, even if a roll crown is formed when no load is applied, This is because due to the rolled material, the sleeve expansion allowance escapes to both sides where there is no rolled material, making it impossible to obtain the desired plate crown amount.

As a countermeasure to this problem, it is conceivable to narrow the effective expansion width of the sleeve. However, for wide rolled materials, the sleeve flange directly covers the sheet width, resulting in a discontinuous roll crown distribution.
There is a risk that abnormal flatness defects such as edge buckles and quarter buckles may occur in the rolled material.

When introducing VC rolls for thick plate rolls with a body length of 4 to 5 m,
In addition to the above-mentioned problem of roll crown shape relief and deflection, it is necessary to use a thick sleeve in order to maintain a predetermined roll crown shape. As a result, an ultra-high pressure hydraulic system is required, which is not practical under field conditions.

(c) Problems to be Solved by the Invention The problems to be solved by the present invention are that the amount of plate crown can be adjusted effectively for both wide and narrow rolled materials, and the roll has a long body length. The purpose is to obtain a VC role that can also be applied.

(d) Means for Solving the Problems The variable crown roll of the present invention includes an arbor having an inner fluid passage and an outer fluid passage, and an inner pressure chamber that fits into the arbor and communicates with the inner fluid passage. a wide outer sleeve surrounding the inner sleeve and forming an outer pressure chamber that fits in the arbor and communicates with the outer fluid passage; and an end portion of the arbor. a rotary joint that is rotatably attached to the rotary joint and independently communicates with the inner fluid passage and the outer fluid passage, and a fluid source that supplies a separate and independent pressurized fluid to the rotary joint, and The above problem is solved by a configuration characterized in that the center portion of the outer surface of the inner sleeve can be pressed against and separated from the inner surface of the outer sleeve.

(E) Example The structure of the VC roll of the present invention will be explained with reference to FIG.

Arbors 11 at both ends of the sleeve roll 1 are rotatably supported by conventional bearings 2. A conventional rotary joint 6 is attached to one arbor 11 so as to be relatively rotatable. An inner fluid passage 12 and an outer fluid passage 13 are provided along the axial direction of the arbor 11 .

The inner sleeve 4 is attached to the arbor 11 by shrink fitting. An inner fluid pressure chamber 41 is formed between the inner sleeve 4 and the arbor 11 . Pressure chamber 4
1 goes through the passage 12 and reaches the rotary joint 6
The inner fluid introduction section 61 is connected to the inner fluid introduction section 61.

An outer sleeve 5 is attached to the arbor 11 surrounding the inner sleeve 4 by shrink fitting. An outer fluid pressure chamber 51 is formed between the outer sleeve 5 and the arbor 11 and the inner sleeve 4 . The pressure chamber 51 communicates with the outer fluid introduction portion 62 of the rotary joint 6 through the passage 13.

The inner and outer fluid inlets 61 and 62 of the rotary joint 6 each communicate with a separate and independent source of pressurized fluid (not shown).

The shape and dimensions of the inner sleeve 4 are designed taking into account the following points.

a When the inner pressure chamber 41 is in an unpressurized state, the distance between the outer circumferential surface of the inner sleeve 4 and the inner circumferential surface of the outer sleeve 5 is set to 0.1 at the center in the sleeve width direction.
Set to ~1.0mm. This is because when the fluid pressure in the inner pressure chamber 41 is made higher than the fluid pressure in the outer pressure chamber 51, the outer circumferential surface of the inner sleeve 4 immediately contacts the inner circumferential surface of the outer sleeve 5, and the effect of the inner sleeve 4 is increased. This is to ensure that the inner sleeve 4 exerts the same effect and to immediately eliminate the influence of the inner sleeve 4 when the pressure is lowered.

b. When inserting the outer sleeve 5 by shrink fitting, set the maximum gap between the outer circumferential surface of the inner sleeve 4 and the inner circumferential surface of the outer sleeve 5 to 0.5 to 3 mm. This is to facilitate insertion of the outer sleeve 5.

c The outer surface of the inner sleeve 4 is barrel-shaped, and the difference in diameter between the center and both ends is 0 to 10 mm. The barrel shape is used to enhance the control effect of the inner sleeve 4.

d The wall thickness of the inner sleeve 4 is such that a predetermined crown distribution can be obtained for various combinations of pressing forces of the inner and outer sleeves and for various combinations of rolling plate width and rolling load.

The shape and dimensions of the outer sleeve 5 are designed taking into account the following points.

a. When the outer sleeve 5 is attached, the inner surface shape should be such that it can be easily attached without interfering with the flanges at both ends of the inner sleeve 4 and arbor 11 that have already been attached.

b The wall thickness of the outer sleeve shall be such that a predetermined crown distribution can be obtained by various combinations of the internal pressure of the inner sleeve, the width of the rolled material, and the rolling load. however,
The inner shape is limited to obtain dimensional margin during installation, and the outer shape is limited by the target roll and
Due to the constraints of the crown, design must be done within a limited range. In order to increase the crown control effect using only the outer sleeve, the inner thickness of the center part must be reduced, and in the present invention, the outer surface shape is made into a slight barrel shape (concave in the center part). Actual manufacturing dimensions such as inner and outer sleeve shapes and arbor dimensions are determined through simulation and rolling experiments.

In the present invention, as a result of simulation,
The following numerical example was used.

Roll body length: 1650mm Roll outer diameter: 1500mm (backup roll) Inner sleeve body length: 1000mm Inner sleeve wall thickness: 13mm (center), 16mm (pressure chamber end) Inner sleeve thickness distribution: Sine curve Outer sleeve Wall thickness: 30mm straight Gap between inner and outer sleeves at center of body length: 0.3mm
(When no pressure is applied) (F) Function The function of the VC roll of the present invention will be explained.
For a relatively wide rolled material, the fluid pressure in the inner fluid pressure chamber 41 is kept below the outer pressure, and the fluid pressure in the outer fluid pressure chamber 51 is changed to reduce the outer sleeve 5.
control the crown.

For relatively narrow rolled materials, the fluid pressure in the outer fluid pressure chamber 51 is kept below the inner pressure, and the fluid pressure in the inner fluid pressure chamber 41 is changed to bulge the inner sleeve 4. As a result, the inner sleeve 4 pushes up the outer sleeve 5 and controls the crown of the outer sleeve 5.

(G) Effects FIG. 2 shows the results of controlling the fluid pressure in the inner pressure chamber 41 with the outer fluid pressure being 100 Kg/cm ² . It can be seen that the crown control effect can be obtained even for narrow-width rolled materials. This suggests that it is also applicable to rolls with long bodies.

FIG. 3 shows the change in plate crown amount due to the difference in internal and external pressures. Due to the gap between the inner and outer sleeves, the expansion effect of the inner sleeve does not appear unless the internal pressure is increased to a certain level.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the VC roll of the present invention. Second
The figure shows the simulation results of the relationship between the internal fluid pressure of the VC roll of the present invention and the plate crown amount of the rolled material for various plate widths. Figure 3 shows the VC of the present invention.
Simulation results of the relationship between the internal fluid pressure of the roll and the plate crown amount of the rolled material for various external fluid pressures. FIG. 4 is a drawing similar to FIG. 2 and shows simulation results for a conventional VC roll. 1: Sleeve roll, 2: Bearing, 4: Inner sleeve, 5: Outer sleeve, 6: Rotary joint, 11: Arbor, 12: Inner fluid passage, 1
3: Outer fluid passage, 41: Inner fluid pressure chamber, 5
1: Outer fluid pressure chamber, 61: Inner fluid introduction part, 6
2: Outer fluid introduction part.

Claims (1)

[Claims] 1: an arbor having an inner fluid passage and an outer fluid passage; an inner sleeve having a barrel-like narrow outer surface that fits into the arbor and forms an inner pressure chamber communicating with the inner fluid passage; and an outer surface of the inner sleeve. a wide outer sleeve substantially internally surrounding a central portion of the arbor and forming an outer pressure chamber communicating with the outer fluid passageway; a rotary joint that independently communicates with a fluid passageway and an outer fluid passageway, and a fluid source that separately supplies pressurized fluid to the rotary joint; A variable crown roll that can be pressed and separated from the inner surface.