JPS5916521B2 - rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for rolling a metal strip (hereinafter referred to as a strike IJ strip).

More specifically, the purpose is to provide a rolling mill suitable for efficiently and efficiently rolling a strip,
The purpose of the rolling mill of the present invention is to combine working rolls with a diameter similar to that of a normal four-high rolling mill and working rolls with an extremely narrow diameter similar to that of a multi-high rolling mill using a rational roll device, and to In addition to reducing the equivalent roll diameter of the operating roll, it is also possible to use a roll made of cemented carbide material, which is used in multi-high rolling mills, as the small-diameter operating roll, thereby suppressing the wear of the small-diameter operating roll and improving the overall efficiency of the rolling mill. Furthermore, by reducing the rolling reaction force that occurs during rolling, it is possible to reduce the rolling reaction force that occurs during rolling, thereby making it possible to use hard materials with high deformation resistance or thin strips that are difficult to roll. ) An object of the present invention is to provide a rolling mill capable of efficiently and efficiently rolling an IJ tube.

In other words, in addition to thoroughly reducing the diameter of the working rolls, the present invention realizes further reduction of rolling reaction force by rolling under strong rolling tension and asymmetrical/different speed rolling. This is a rolling mill with high rigidity.
Realizes strip rolling with good thickness accuracy, and what's more? d
This rolling mill makes it possible to reduce the so-called edge drop, which is a sudden drop in the thickness of the strip caused by roll flattening at the width end of the strip, and to roll the strip with high precision.

The present invention also provides the ability to simultaneously roll three times in one pass by a combination of rolls with extremely different diameters: an extremely small diameter working roll and a relatively large diameter working roll similar to that of a conventional four-high rolling mill. This is a rolling mill that can achieve high rolling efficiency with a single rolling mill.

Furthermore, a feature of the present invention is that the threading operation of the tip of the strip, which must be carried out at the start of the rolling operation, can be quickly and easily carried out using extremely simple operations in a conventional rolling mill. It is an efficient rolling mill that can be equipped with special functions that are not available, and that can reduce labor and scale easily.

Furthermore, a feature of the present invention is that the small-diameter operating roll, which is an important element when using an extremely small-diameter operating roll, can be replaced quickly and without labor by a simple operation. It is on a rolling mill.

The purpose and important features of the present invention have been described above, but in order to clarify the importance of the present invention, the functions required of the rolling mill will be summarized and described.

The first performance required of a rolling mill is how easily a material to be rolled, such as a strip, can be rolled and deformed.

That is, how much rolling work can be done with less energy consumption.

Naturally, in this case, it is necessary to reduce the rolling force acting on the rolling rolls.

The size of the rolling mill itself and the size of the equipment involved in driving the rolling rolls are influenced by the magnitude of the rolling force, which greatly affects the construction cost and operating cost of the equipment.

Furthermore, it also affects the progress of wear of the rolls, which greatly affects the frequency of roll replacement, and ultimately the production efficiency, the labor of operating personnel, and the stability of the quality of the strip after rolling.

Second, when passing the material to be rolled through the rolling mill, it must be possible to operate it easily and quickly, without depending on the experience and skill of the operating personnel.

The quality of this operability greatly influences productivity, which in turn influences the reduction of labor for rolling mill operating personnel, and further influences the possibility of remote or automatic operation of the rolling mill.

The third issue is whether the structure of the rolling mill is simple.

This greatly affects the accuracy of the rolling mill and the difficulty of equipment maintenance.

A good example of this is that multi-high rolling mills have complex structures, so even if the rolling work is originally excellent, a small failure can cause the overall work to be poor.
The question is whether or not the roll replacement work can be done easily.

This greatly affects the length of the interruption period of the rolling operation due to roll replacement, and has a large impact on production efficiency.

The fifth issue is whether changes in the shape and cross-sectional profile of the strip due to thermal expansion, wear, and even deflection of the rolling rolls can be stably maintained to a small extent.

This determines whether good quality strips can be produced stably and efficiently.

The present invention provides a rolling mill with new functions and structure that simultaneously satisfies many functions required of such a rolling mill.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The principles and operations of a conventional rolling apparatus and a rolling mill according to the present invention will be specifically explained below with reference to the drawings.

Figures 1 and 2 are the same figures as described in the specification of US Pat. contact rolls a and b with gaps that allow the loop of the strip to pass through a plurality of rolls having the same diameter;
is rotatably supported by a frame with a fixed axle core to directly participate in the rolling operation, and a relatively small diameter roller with a diameter slightly larger than the roll gap is placed directly below the axial center surface of the two contact rolls. A non-driven floating roll C is arranged to pass the strip as shown in the figure, and a contact roll A is placed under the action of the strip tension alone.

A floating roll is drawn into the gap b for rolling.

This rolling equipment uses strong tension and relatively small diameter floating rolls C to efficiently roll the scales, and the rolling equipment is characterized by an extremely simple structure, which is not found in conventional rolling mills. It has excellent rolling ability.

On the other hand, Japanese Patent Application Publication No. 1973-21446 relates to the improvement of the above-mentioned floating roll rolling machine, and FIG. 3 shows the above-mentioned U.S. Pat.
, 756 is shown.

The key point of the improvement in the patent application is to use floating rolls d of relatively large diameter and to carry out rolling under the action of a relatively small tension T, thereby preventing premature wear expected in the case of floating rolls of small diameter. Furthermore, it is said that it prevents a significant drop in flat dust when rolling with a high tension.

Furthermore, floating rolls with a sufficiently large diameter are selected to prevent the floating rolls from escaping from the gaps e and f due to roll wear from the contact rolls (expressed as side rolls in the specification of Japanese Patent Publication No. 41-21446). There is.

Furthermore, in order to compensate for the lack of pressing force due to only the strip tension, a pressure roll is added to press the floating roll, and by applying pressure regardless of the tension, highly efficient rolling can be performed.

The aims of the two inventions with floating rolls according to the above examples are very symmetrical. In the latter case, due to the small diameter of the floating roll, roll wear progresses quickly and the shape deteriorates due to the unavoidable high tension. However, the lack of pressure is compensated for by applying pressure rolls.

In the end, it can be understood that the former aims at efficient rolling using floating rolls, while the latter attempts to retreat from that aim and gain certainty.

The problem with rolling mills with floating rolls is that due to roll wear, the floating roll moves unstably with respect to the axial center surface of the contact roll, and the rolling condition changes significantly due to changes in the diameters of the contact roll and floating roll. It is understood that this is particularly true, and one of the reasons why it is difficult to put this rolling machine into practical use, even though it has excellent features, is that it is difficult to perform sheet threading operations in actual operations.

The present invention has been made in view of the above-mentioned background. Hereinafter, the configuration and operation of the rolling mill of the present invention will be explained with reference to the drawings.

FIG. 4 is a preliminary roll layout diagram illustrating the principle that makes the invention possible.

In the figure, reference numeral 1 indicates an operating roll located at the center of the rolling mill, which will hereinafter be referred to as the center operating roll.

2, 2', and 2'' are three actuation rolls provided radially surrounding the central actuation roll 1, and hereinafter referred to as outer circumferential actuation rolls.

3 indicates a strip which is a material to be rolled. The strip enters from above the outer working roll 2 provided diagonally above as shown by the arrow, passes through the space A between the center working roll 1 and the outer working roll 20, while contacting the working roll, and passes through the central working roll 1. It passes through B between the lower peripheral working roll 2' and the central working roll 10, and further wraps around the central working roll 1.
Passing through C between the other outer working roll 2'' provided diagonally above and the center working roll 1, and coming into contact with the outer working roll 2, the thread moves upward as shown by the arrow. ) When the thickness of the IJ knob is negligibly thin and the outer working rolls 2, 2', and 2'' have the same diameter, 1d>D information-1) 90° 1547D-: 6.464D...
...... (1) However, d: Diameter of the center working roll D: Diameter of the outer working roll With the combination of the central working roll 1 and the outer working rolls 2.2' and 2'' under the conditions shown in equation (1), the outer working roll The working rolls do not come into contact with each other, ensuring smooth rotation.

This fact is very important and convenient for putting the rolling mill of the present invention into practical use.

For comparison, in the Sendzimya rolling mill, which is a typical rolling mill with the smallest working roll diameter among strip rolling mills in practical use, the working roll diameter is 1 to 21 mm.
However, if a central working roll with a diameter of 60 mvt is adopted in the rolling mill of the present invention, and the outer working roll diameter is approximately 387 mm or less, the outer working rolls 2, 2'
, 2'' are no longer in contact with each other and can rotate without interfering with each other's rotation.

This kind of thick outer circumferential working roll is within the range of working rolls for four-way rolling mills that are already in practical use, and has more than sufficient roll strength to roll wide strips. There is.

In other words, in a high-performance rolling mill that efficiently rolls with two working rolls of the same diameter, the working roll shaft rotatably supports the working roll independently of the reinforcing roll shaft box and the rolling mill housing. The box space is secured, the rolls have sufficient roll neck strength to transmit rolling torque, and the operating rolls have sufficient rigidity in the direction of strip travel.

In particular, when the central working roll is extremely thin as in the rolling mill of the present invention, and rolling reaction force and rolling torque are reduced, the peripheral working roll will maintain sufficient strength even if made even thinner.

It has already been confirmed in a practical mill that a working roll with a diameter of 270mm can be used in a regular 4-foot width rolling mill, and that it has sufficient strength.

This means that the diameter of the central working roll of the rolling mill of the present invention is 1-! in wide strip rolling. This suggests the possibility of making it thinner than L inch.

As with the Sendzimir mill, such narrow center-actuating rolls can be made of cemented carbide, which compensates for the shortcomings of small-diameter rolls and reduces wear problems.

On the other hand, the extremely small-diameter working rolls are always firmly supported from three sides at the center of the rolling mill by the outer peripheral working rolls 2, 2', and 2'' fully supported by the reinforcing rolls, so that they are maintained in an ideal supported state.

Unlike the above-mentioned rolling mills with floating rolls, rolling is performed while the center operating roll always maintains a stable position at the center of the rolling mill. It will be appreciated that the roll is reinforced.

FIG. 5 shows the overall roll arrangement of the rolling mill of the present invention based on the principle of FIG.

Reinforcement rolls 4゜4', 4'' and deflector rolls 5,
5' is added to show the state of threading in actual work.

Reference numeral 6 denotes a central working roll support that supports the central working roll 1 and the lubricant spray header 7 of the central working roll.

The support body 6 can be pulled upward, and is movably supported by a rack and pinion or hydraulic device (not shown) so that the center operating roll 1 can be reciprocated between the center of the rolling mill and a timing position 11 above the rolling mill. has been done.

3 indicates a strip of material to be rolled.

The outer peripheral rolls 2 and 2'' are respectively mounted so as to be movable diagonally upward, and the rolling devices 9 and 9' control the amount of movement, that is, the initial threading, the movement of the evacuation pit necessary when changing the rolls, and the rolling target. It is designed to be able to adjust the amount of reduction of the material and also handle the necessary amount of movement in consideration of roll wear.

The state when the outer peripheral rolls 2, 2'' are retracted for initial threading is shown by 22 and 22〃 in the figure.

In the present invention, the other peripheral working roll 2' does not have a rolling device, and is configured to be able to move in the rolling direction by a small amount corresponding to a change in diameter due to wear of the roll. There is.

Next, the actual rolling process will be explained.

) The tip of +J knob 3 is the deflector roll 5, 5'
It moves horizontally on the top and is gripped by the left reel 8'.

Next, the center actuating roll 11 that was positioned above the pass line
forces the strip downward while being supported by the central actuating roll support 6.

At this time, the outer peripheral working rolls 2 and 2' are opened by a rolling device 9, 9' and a roll balancing device (not shown) to a sufficient opening degree for the central working roll 1 to enter the center of the rolling mill.

The central working roll that has pushed the strip from above passes between the opened external working rolls 2 and 2'', and is lowered until it hits the lower peripheral working roll 2', which has been adjusted to a predetermined height ζ, and then is rolled down. The device 9, 9' allows the diagonally upper 2
Once the book's outer circumferential actuation roll has moved, it will clamp the IJ knob and center actuation roll.

Next, a rolling blade according to the purpose of rolling is attached to the rolling device 9゜9'.
As a result, the center working roll 1 is rolled down at the center of the rolling mill so as to sandwich and press the strip from three sides.

Next, while applying tension with the reels 8, 8', any one, two, or even three of the outer circumference actuating rolls 2, 2', 2'' are driven under separate speed control. Rolling is started.

The central working roll 1 is rotated indirectly via the strip.

On the other hand, at the end of the rolling operation, the center operating roll is pulled upward by an operation that is almost the reverse of that at the start of the operation.

Also, the replacement of the center working roll is removed from the support 6 away from the center of the rolling mill.

In this case as well, if the support 6 is made to be able to swing back and forth between the place where used rolls are placed and the place where new rolls are supplied, this can be done quickly and without the need for labor.

The support body 6 rotatably supports the roll end portion,
It is preferable that this roll support mechanism can be quickly supported or released by hydraulic pressure or the like.

In the explanation so far, the three outer working rolls are the same, but in order to make effective use of the outer working rolls, the diameters of the outer working rolls 2, 2', and 2'' may be changed sequentially. This is possible within the adjustment range of the rolling down device.

As described above, unlike a conventional rolling mill having floating rolls, the rolling mill of the present invention has three peripheral working rolls,
In addition, if necessary, three reinforcing rolls are provided to reinforce the operating roll, and the outer operating rolls 2, 2'' are rolled down diagonally from above toward the center, and the diameter of the outer operating roll is approximately equal to the diameter of the large diameter outer operating roll and the outer operating roll. The central working roll has an extremely small diameter close to 1, and the central working roll support pulls out the central working roll out of the rolling mill, and this configuration enables rolling with a small rolling force in an extremely stable state, and at the same time, This allows the sheet threading work and roll replacement work to be carried out quickly and without the need for labor.

In addition, the present invention has high rigidity of the rolling mill due to the three-point support feature.
The rolls can also be used within a large wear range within practical limits, and overall extremely economical operation is possible.

Note that because the diameter of the center working roll 1 is small, it is possible to pull out the center working roll 1 from the center of the rolling mill to the outside of the rolling mill without opening the outer working rolls 2, 2'' wide, so that the strip and the center can still be pulled out from the center of the rolling mill. The relative sliding length of the actuating rolls is also short, and the surface quality of the strip on the central actuating roll side is also maintained well.

Furthermore, since the diameter of the central working roll is extremely small, the amount of thermal expansion of the central working roll is also small, and a stable rolled shape is maintained.

Furthermore, since the outer peripheral working roll is reinforced by the reinforcing roll, the deflection of the outer peripheral working roll is small, and the roll can be stably rolled into a good shape even when the rolling material changes.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a rolling mill using conventionally known small-diameter floating rolls, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a diagram showing the configuration of a rolling mill using conventionally known large-diameter floating rolls. FIG. 4 is a diagram showing the basic principle of the present invention, and FIG. 5 is a diagram showing an embodiment of the present invention. 1... Center operating roll, 2, 2', 2"...
...Peripheral working roll, 3... Strip of material to be rolled, 4, 4'. 4"...Reinforcement roll, 5,5'...Deflector roll, 6...Center operating roll support, 7...Lubricating oil spray header, 8,8'
...Strip take-up reel, 9,9'...
・・Reduction device.

Claims (1)

[Claims] 1. A central actuating roll that is extremely small compared to the diameter of the outer circumferential actuating roll, and two outer circumferential actuating rolls that are close to each other diagonally above and below the central actuating roll. , three large-diameter outer peripheral working rolls arranged radially so as to perform simultaneous rolling at three points between the material to be rolled and the central working roll, and three large-diameter outer working rolls arranged diagonally above the central working roll. 1. A rolling mill comprising a rolling device configured such that two outer circumferential operating rolls are capable of retracting and rolling down the material to be rolled. 2 The center working roll diameter is 1/6 of the outer working roll diameter.
The rolling mill according to claim 1, which has an extremely small diameter close to .