JPS5935817A - Rolling mill and roll therefor - Google Patents

Abstract

PURPOSE:To improve the accuracy and the efficiency of rolling, by forming the end part of a core body of roll into a stepped shape and inserting a sleeve to the core body, and making the effective length of a roll body changeable. CONSTITUTION:The end part of a core body 6 of roll and/or the end part 8 of a sleeve 7 are formed into stepped shapes, respectively, and the sleeve 7 is fitted to the core body 6. And ring spacers 10, 11 are respectively inserted to a cylindrical space formed between the end part 8 and the end part of the core body 6. The fitting conditions among the sleeve 7, the core body 6, and the spacers 10, 11 are changed by moving the spacers 10, 11 in the axial direction. A rolling roll having said construction is incorporated as at least one of a work roll, a hollow roll, and a back-up roll into a rolling mill. Both accuracy and the efficiency are improved by using said rolling mill.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill that can perform DI rolling, and aims to improve rolling accuracy, rolling efficiency, and resource conservation.

The four-high rolling mill shown in Fig. 1 has been widely used even now, but the drawbacks of this four-high rolling mill are the rolling rolls (back roll a,
When rolling a rolling plate d having a narrow width compared to the body length of the work roll b), the work roll b)
is curved and the crown of the plate increases. Therefore, in order to prevent the plate crown from increasing, the work roll b + F + h t6
Although bending of the work roll is carried out by applying a force in the separation direction to There's a problem.

Several improvements have been made to overcome these drawbacks, one of which is a system in which the intermediate roll C in a six-high rolling mill shown in FIG. 2 is roll-shifted. However, although the above-mentioned drawbacks have been solved in this method, the following new drawbacks have appeared.

1111, the number of rolls increases and the contact surface pressure distribution of the rolls becomes uneven in the roll body length direction, and its maximum (1(j
The number of rolls increased significantly, leading to severe wear and tear on the rolls and increased roll maintenance costs. Furthermore, since the rolling mill structure (14) is symmetrical about the center, if the rolling plate d deviates from the center of the rolling mill, meandering is likely to occur.

As a simpler improvement, there is also a system in which large chamfers are provided at both ends of the backing roll a to prevent the work roll b and the backing roll a from coming into contact with each other at both ends of the rolls, as shown in FIG. However, although this method is good for narrow boards,
When the width of the plate increases, both ends of the work roll b escape, making the width of the plate thicker and creating a negative crown.

In view of the above-mentioned circumstances, the present invention improves the roll and performs rolling using the further improved roll to eliminate all of the above-mentioned drawbacks. At the same time, a sleeve is fitted to the roll core, a ring spacer is fitted in the cylindrical space formed between the step part of the sleeve and the roll core, and the link spacer is moved in the axial direction. The link spacer is characterized in that the engagement and superposition of the link spacer with the sleeve and the roll core can be changed, and the effective roll body length that contributes to rolling can be changed.

The present invention will be described in detail below with reference to the drawings.

First, referring to FIG. 4, the rolls installed in the rolling mill of the present invention will be explained.

In the figure, 1 is a roll, 2 is an axle box, 3 is a bearing, 4 is a bearing press plate, and 5 is an oil seal fitted to the bearing press plate 4. The roll l has the following configuration.

A sleeve 7 is fitted onto the outer periphery of the roll core 6 by positioning, and the sleeve 7 constitutes the body of the roll 1. The portions of the roll core 6 corresponding to both sleeve ends 8 are stepped portions 9 that are smaller in diameter than the portions that fit into the sleeve 7. The circumferential surface is tapered to a required taper, and a pair of ring spacers 10 and 11 are inserted in the axial direction in the cylindrical space formed by the outer circumferential surface of the stepped portion 9 and the tapered inner circumferential surface of the sleeve end portion 8. Install movably.

The outer peripheral surface of both ring spacers 10.11 is the sleeve end 8.
Each sleeve end f11 on the outer circumferential surface of the ring spacer 10.11 has a tapered surface that can engage with the tapered inner circumferential surface of
A ring groove 12.12 is carved in the piston link 1.
3.13, and groove 1 on the inner circumferential surface opposite to the sleeve end.
Mark 4.14 and fit O-ring 15.15.

Further than the step 9 of the 1m sleeve end 8 (12m1)
The inner diameter of the portion extending to 1 is larger than the tapered inner peripheral surface, and a screw 16 is carved therein. In addition, a step portion 1 extending from the step portion 9 and continuing to the shaft portion 17 has a diameter smaller than that of the neck portion 9.
The seal link 19 is fitted into the seal ring 19, and the one 11111 surface of the seal ring 19 is attached to the iffff resleeve end 8-.
abut against the stepped surface that forms the boundary between the inner circumferential surface of the pad and the screw 16,
Between seal ring 19 and neck portion 18 and seal ring 1
An O-lifter 20, 20 is sandwiched between the sleeve end portion 9 and the sleeve end portion 8. The seal ring 19 is then fixed with a ring nut 21 screwed onto the screw 16.

The space surrounded by the sleeve end 8, the stepped portion 9, and the seal ring 19 into which the ring spacer 10.11 is fitted is in an oil-tight state, and the space between the box surface opposite to the shaft of the ring spacer 10 and both ring spacers 10.11 is sealed. , between the ring spacer 11 and the seal link 19 are a fitJ1 oil chamber 22 and a second oil chamber, respectively.
An oil chamber 23 and a third oil chamber 24 are formed, and the oil chambers 22 and 2
3 and 24 have oil passages 25, 26, and 27 drilled in the stepped portion 9 and neck portion 18, respectively, and connected to a hydraulic power source (not shown).
is connected.

Note that 28 and 29 are spiral grooves carved on the inner and outer surfaces of the ring spacer 10, and the spiral groove 28 communicates with the second oil chamber 23.
The spiral groove 29 communicates with the first oil chamber 22.

Furthermore, 30.31 is the inner and outer surfaces of the ring spacer 11 (this item 1
The spiral groove 30 communicates with the third oil chamber 24, and the spiral groove 31 communicates with the second oil chamber 23.

In addition, in Fig. 4, the half figure is ring spacer 10.11.
When the ring spacer 10.11 is engaged with the tapered inner circumferential surface of the sleeve end 8, that is, when the ring spacer 10.11 is fitted, the sleeve end 8
The lower half of the figure shows a state in which it is fitted between the stepped portion 9 and a slight gap between the tapered inner peripheral surface and the fitted state is a loose state.

In the roll having the above configuration, when pressure oil is supplied to the first oil chamber 22, the link spacer 10.1.1 moves to the axle box 211111.
When the pressure oil is supplied only to the second oil chamber 23, only the ring spacer 10 moves to the side opposite to the shaft oil, and the ring spacers 10 and 11 become engaged (lower half of Figure 4). becomes. Furthermore, if pressure oil is supplied to the second oil chamber 23 and pressure oil with a higher pressure than the second oil chamber 23 is supplied to the third oil chamber 24, both the ring spacers 10 and 11 move toward the opposite shaft oil side and are in the engaged state. (Fig. 4).

Here, the pressure oil supplied to each oil chamber 22, 23, 24 applies a force in the axial direction to the link spacer 10.11, and flows into the spirals 7428, 29.30, 31, and the link spacer 10.11. Provides lubrication between the stepped portion 9 and the sleeve end 8, and seals the sleeve end 8 and the ring spacer 10.11.
to allow easier axial movement.

When a plate roll is used for silking in a rolling mill, the rolling force acting on the sleeve end 8 is not transmitted to the stepped portion 9 when the ring spacers 10 and 11 are loose.
When both ring spacers 10.1.1 are in an loose state, the effective length of the roll body capable of transmitting rolling force is 1°, and when only link spacer 1o is in a loose state, the rolling horn for that part is 1°. is transmitted, so the effective roll length is 1.
Furthermore, when both ring spacers 10 and 11 are in the engaged state, the effective roll body length is 1. bawl.

When the roll is assembled into a rolling mill and rolled, the rolling accuracy can be improved by appropriately engaging and loosening the ring spacers 10 and 11 depending on the width of the strip to be rolled.

Furthermore, when the ring spacer 10.11 is engaged, if the hydraulic pressure J is increased to change the engagement depth, the sleeve end 8 expands due to the wedge effect of the ring spacer 10.11, changing the roll profile. It is possible to further increase the ability to control the shape of the rolled plate.

Fig. 5 shows another example of a roll, in which the inner circumferential surface of the sleeve end 8 and the outer circumferential surface of the ring spacer 10 and 11 are stretched parallel to the axis, respectively, and an annular shape of the same pitch is formed. Alternatively, a spiral groove 32° 33 is carved, and the ring spacer No. 11 is moved in the axial direction by a half pitch of the groove, so that the peak of rM 32° 33 is in contact with the soil and the groove 32.33 This creates a state in which the mountain and the mountain intersect with each other.

! Even if the link spacers 10 and 11 are constructed in such a manner that they can be disengaged, it is possible to create a state in which the link spacers 10 and 11 are engaged and loose, and the same effect as that of the roll described above can be obtained.

In addition, in the configuration of the roll mentioned above, the end of the roll core 6 is shaped like a step to form a cylindrical space, but the sleeve 7
Of course, it is also possible to make the end part of (9) step-shaped.

Next, referring to FIG. 6, a rolling mill according to the present invention using the above roll as a work roll will be explained.

In the figure, numeral 34 is a work roll having the above-described configuration, and numeral 35 is a backup roll.

When rolling a narrow rolling plate 36 as shown in FIG.
Both the link spacers 10 and 11 are brought into a loose state so that there is no downward force transmission effect at these parts. That is, the effective roll body length of the work roll 34 in this state is I. bawl.

Next, when rolling a medium-width rolled plate, only the ring spacer 10 needs to be in the engaged state, and the effective roll body length in this case is 1. Therefore, when rolling a wide rolled plate, the ring spacers 10 and 11 may be brought into engagement with each other, and the effective roll body length in this case is 1. bawl.

The engagement and loose operation of the ring spacers 10 and 11 depending on the width of the rolled plate are basically as described above, but depending on the rolling condition, for example, even when rolling a narrow plate (10), the work roll In order to avoid thermal crowning, it may be better to curve the work roll by rolling force. In that case, the link spacers 10 and 11 are engaged, so that the curved shape of the work roll 34 matches the rolling plate 36.
All you have to do is make it so that it is transferred to . In short, depending on the rolling state, the ring spacers 10, 11 may be appropriately engaged or loosely engaged to change the effective roll body length of the work roll 34 and adjust the plate crown of the rolled plate.

Furthermore, although the state of curvature of the work roll differs greatly depending on the engagement and looseness of the link spacers 10 and 11, it is also possible to use work roll bending (jf) as a means to compensate for this difference.

L (11) When rolling a rolled material of a certain width, it is necessary to reduce the plate crown, and the link spacer 1
Assume that 0.11 is in an idle state. As a result, the curvature of the work roll 34 becomes reversed, and the plate crown decreases too much, resulting in a slightly negative crown. In such cases, the work roll pending force should be reduced and fine adjustments should be made to achieve the optimum crown (11).

The following is a case where the roll having the configuration shown in n11 is incorporated into the work roll of a four-high rolling mill, but it is of course possible to incorporate it into the backing roll as shown in Fig. 7, and in this case, the effective Set the roll body length to 1. ．． 14.

It goes without saying that if you change the width of the ring spacer with the first roll, the first work roll, and the second roll, you can match the width of the ring spacer by changing the combination of ring spacer engagement and play. The number of pieces is 1
Or it may be 3 or more.

Furthermore, can it be incorporated into the intermediate roll of a 6-high rolling mill? −) can also be done.

As described above, according to the present invention, (1) the curved state of the work rolls can be controlled by changing the effective roll body lengths of the work rolls, backing rolls, and intermediate rolls [by changing the load state of rolling force]; (11) The plate crown can be controlled to the optimum value, which improves yield.
Accuracy can be improved and energy can be saved. (12) 011) Rolled plates of various widths can be rolled without changing the work rolls, and the operating rate of the rolling mill can be greatly improved. Since it is symmetrical, it exhibits excellent effects such as preventing the rolled plate from meandering off center.

[Brief explanation of the drawing]

1 to 3 are schematic explanatory diagrams of a conventional rolling mill, FIG. 4 is an explanatory diagram showing a first example of rolls installed in the rolling mill according to the present invention, and FIG. 5 is an explanatory diagram of the same. , FIG. 6 shows the first embodiment of the present invention.
FIG. 7 is a schematic explanatory diagram of the second embodiment of the same IT11. 6 is an oil seal, 7 is a sleeve, 8 is a sleeve end,
9 is a stepped portion, 10.11 is a ring spacer, 22 is a first
23 is a second oil chamber, and 24 is a third oil chamber. (13)

Claims (1)

[Claims] 1) A sleeve is fitted to the roll core, and the end of the roll core,
At least one of the ends of the sleeve has a stepped shape, a ring spacer is fitted into the cylindrical space formed between the sleeve end and the roll core end, and the ring spacer is moved in the axial direction, thereby forming the sleeve. A roll for a rolling mill, characterized in that the fitting state between the roll core and the link spacer is changed. 2) Fit a sleeve to the roll core, make at least one of the end of the roll core and the end of the sleeve a stepped shape, and place a ring spacer in the cylindrical space formed between the end of the sleeve and the end of the roll core. A work roll, a hollow roll, 1< ? The fact that you entered at least -111 on the roll is specially marked as t71&r.
f-rolling machine.