KR101139305B1 - Rolling mill for rolling metallic band - Google Patents

Abstract

In a rolling mill for rolling metal strip ( 1 ), especially steel strip, which has at least one rolling stand ( 2 ), an upstream coiler ( 3 ), and a downstream coiler ( 4 ), wherein an "S" roll unit ( 5, 6 ), which has two rolls ( 7, 8; 9, 10 ) that guide the strip ( 1 ) in the form of an "S", is arranged between the upstream coiler ( 3 ) and the rolling stand ( 2 ) and/or between the rolling stand ( 2 ) and the downstream coiler ( 4 ), the invention provides that a first roll ( 7, 9 ) of the "S" roll unit ( 5, 6 ) is arranged in a fixed manner, and a second roll ( 8, 10 ) of the "S" roll unit ( 5, 6 ) is arranged in such a way that it can move relative to the first roll ( 7, 9 ).

Description

Rolling system for rolling metal bands {ROLLING MILL FOR ROLLING METALLIC BAND}

The present invention includes at least one roll stand, a winch unit that has been displaced, and a winch unit that has been post-installed, the at least one of an area between the rolled winch and the roll stand and an area between the roll stand and the rolled winch. In the area an S-roll unit is arranged, said S-roll unit comprising a roll for guiding a metal band in an S-shape, wherein the first roll of said S-roll unit is fixedly positioned and said S-roll unit The second roll is movably disposed with respect to the first roll, the second roll movably disposed with respect to the first roll is rotatably disposed on the rotary arm and the rotary arm is spatially fixed to one side. A rolling system for rolling a steel band as a metal band, located in an axis.

In particular, as the demand for weight reduction increases in the automotive industry, load-adapted parts, so-called Tailored Blanks, have been developed and used. A substantial feature of the part in connection with this particular interest is that it has a variable thickness. First of all, the cutting blank was produced by welding. More preferably, however, flexible cold rolling has also emerged, in which the cutting blank can be produced for the production of the cutting blank.

In flexible cold rolling, the thickness of the rolled product changes during rolling. At this time, the change of the rolling gap may be performed periodically. Due to this change in thickness, mass flow disturbances and tension vibrations occur, in particular, on the inlet and outlet sides of the roll stand. In this type of facility, a so-called dancer roll is inserted between the roll stand and the winch, since the dynamics of the winch motor are no longer sufficient for its compensation at the rolling speed required for advantageous production.

WO 03/008122 A1 describes this solution. There is disclosed a cold rolling system for cold rolling a metal band, comprising: a single stand having means for adjusting the rolling gap, a winch unit installed in front of a cold rolled single stand for winding the band, and a roll stand for unwinding the band. It includes a winch installed. In order to enable flexible rolling, a band memory is provided between the displaced winch and the roll stand for mass flow control or band tension control of the rolling process. This band memory consists of at least three rolls. Here, the intermediate roll is formed as a dancer roll and can move perpendicular to the conveying direction of the band.

Rolling systems of this type are described in DE 30 24 682 A1 and JP 04 182019 A. Here, a rotary arm for adjusting one roll of the S-roll unit relative to another roll is located above the upper roll. The moving member faces the lower roll bottom. Thus, a very large adjustment path is required to perform the roll adjustment.
A solution similar to WO 03/008122 A1 (with a larger number of rolls, of course) results from EP 1 121 990 A2. Equivalent is valid for the examples known from JP 10034204 A.

The dancer roll described in the above-mentioned patent document is connected to a linear actuator. The dancer roll can be adjusted or controlled by the linear actuator to move in a direction perpendicular to the conveying direction of the band. Accordingly, the band memory function essential for flexible cold rolling can be performed.

From DE 198 18 207 C2 and JP 60231516, for example, a so-called looper, ie a roll, is disclosed which is arranged in a band guided to or derived from a roll stand such that tension transfer can be carried out within the band, for example.

The rolling force in rolling can be reduced by the tension on each side of the rolling gap. At this time, the tension should not be too high only in the final rolling, because otherwise, according to the invention, problems may occur in subsequent processing steps, in particular in the glow step. In order to form a tension difference between the roll stand and the winch, an S-roll unit (S-roll) may be used.

If a band memory function (typically with a dancer roll) is performed and a desired tension difference (generally by an S-roll unit) between the roll stand and the winch occurs, a significant machine cost is required in the already disclosed solution. .

It is therefore an object of the present invention to form a rolling system for rolling metal bands of the kind mentioned above, which can be carried out using simple means and in an economical manner, with the band memory function being provided in particular in flexible rolling and It is to be able to maintain a predetermined difference in tension between the roll stand and the winch.

According to the present invention, the object is that a linear axis of rotation corresponds to the axis of rotation of the first roll, and a linear actuator is flexibly disposed on the rotational arm in the rotational point spaced apart from the spatially fixed axis, the rotational point of the This is achieved by placing on the connecting line between the axes of rotation of the two rolls.

According to the invention, the S-roll unit must be provided between the winch and the roll stand, with the exception of the guide roll of the band, which is further provided in some cases. Here, by the proposed embodiment of the S-roll unit, the band memory function and the necessary tension can be performed on the band.

At this time, the two axes of the roll of the S-roll unit is preferably arranged parallel to each other.

Preferably, a hydraulic-piston-cylinder system is used as the linear actuator.

Means may be provided for driving at least one of the rolls of the S-roller unit in order to optimally influence the formation of tension in the band.

The proposal according to the invention is preferably used in cold rolling equipment. In addition, the roll stand is preferably provided as a single stand. Since the proposed system is particularly suitable for flexible rolling, the roll stand can be provided with means for flexibly adjusting the rolling gap.

Finally, the conveyance of the band or its own operation is improved by providing at least one winch part with means for rotation speed control.

The proposed system provides a rolling system for flexible rolling, which is very simple and can be carried out at low cost and in this way uses substantial band memory. In addition, since the band is also maintained under the required tension, the rolling itself can be carried out in a methodologically preferred manner.

Embodiments of the invention are illustrated in the accompanying drawings. Among the accompanying drawings,

1 is a side view schematically showing a rolling system for flexible rolling of a metal band,

2 is an enlarged view of the S-roll unit on the outflow side of the rolling system.

<Code description>

1 metal band (steel band) 2 roll stand

3 post-winch section 4 post-winch section

5 S-Roll Unit 6 S-Roll Unit

7 rolls 8 rolls

9 rolls 10 rolls

11 rotating arm 12 space stationary axis

13 turning points 14 linear actuators

Carrying direction of R band

In FIG. 1 a rolling system can be seen schematically. That is, as the wound metal band, the steel band 1 is unwound by the displaced winch part 3 and supplied to the single cold roll stand 2. The winch part 4 which is backed in the conveyance direction R of the said metal band 1 behind the roll stand 2 is provided. The winch part 4 rewinds the rolled metal band 1. Since the winches 3, 4 have a drive not shown, the metal band 1 can be unwound or wound in an adjusted or controlled manner.

Flexible cold rolling of the metal band 1 is performed in the roll stand 2. At this time, the metal band 1 has a non-uniform thickness when viewed in its longitudinal direction. This means that during the rolling process the rolling gap changes according to a predetermined profile in order to produce a band in which the thickness changes periodically.

In order to carry out this process in a methodologically suitable manner, it is necessary to compensate for large flow changes in the metal band 1 which occur due to the variable band width. In addition, in order to keep the rolling force small, a predetermined tension must be generated or maintained in the metal band 1.

To this end, an S-roll unit 5 or 6 is respectively provided between the displaced winch part 3 and the roll stand 2 and between the roll stand 2 and the rearward winch part 4, respectively. Is placed. Each S-roll unit 5, 6 has two rolls 7, 8; 9, 10 arranged in one another in a well known manner so that the metal band 1 is guided in an S-shape. By winding the required rolls 7, 8; 9, 10 accordingly, a force is transferred onto the metal band 1 when the roll is correspondingly driven and this desired tension is transferred to the S-roll unit 5. It can be held in the metal band 1 between 6) and the roll stand 2.

In addition to generating tension in the metal band 1, the S-roll units 5 and 6 are formed, as can be seen in FIG. 2, in order to perform a band memory function. Positionally fixed is a roll 9 or 7 which feeds or guides the metal band 1 to the roll stand 2. Alternatively, another roll 10 or 8 is rotatably positioned with respect to the first roll 9. For this purpose, the roll 10 is arranged at the end of the rotary arm 11. At the other end of the rotary arm 11 is located a spatially fixed axis 12 corresponding to the axis of rotation of the first rolls 9, 7.

One end of the linear actuator 14 is disposed flexibly apart from the axis of rotation of the second rolls 8, 10, ie at the point of rotation 13. Here, the linear actuator 14 is formed as a hydraulic piston-cylinder-system. The provision of a linear actuator 14 containing hydraulic oil is shown.

By means of adjusted or controlled actuation of the hydraulic piston-cylinder-system containing hydraulic oil, the rotation point 13 can be raised or lowered, so that the second rolls 8, 10 have their own rotational axis 12 It can be rotated around. Accordingly, a relatively long or short section of the metal band 1 between the roll stand 2 and the winch part 3 or 4 occurs. Thereby, the S-roll units 5 and 6 can perform the band memory function.

Due to the rolling arrangement and in particular the described structure of the two S-roll units 5, 6, it is possible to compensate for the mass flow changes occurring during flexible cold rolling in a very simple configuration, and at the same time the roll stand 2 And the same tension difference may occur between the winch parts (3, 4) to enable an optimal rolling process. During the rapid control of the corresponding linear actuator 14, mass flow disturbances can be compensated without significant tension vibrations.

To date, a larger number of rolls have been provided in order to reach this purpose, and it has been necessary to make corresponding equipment expensive.

Due to the mass flow obstruction and the reduction in tension vibrations that occur with it, the band thickness control can be improved. Adjustment of elasticity suitable for the rolling process can be performed without considering elasticity present in the winch portion.

Now, the compensation and band memory functions of mass flow control are realized in one device, ie in the S-roll unit described above, which has so far required a separate device.

Claims (10)

In a rolling system for rolling a metal band (1) having at least one roll stand (2), a front winch section (3), and a back winch section (4), S-roll units 5, 6 are arranged in at least one of the area between the rolled winch part 3 and the roll stand 2 and the area between the roll stand 2 and the rolled winch part 4. The S-roll unit 5, 6 includes rolls 7, 8; 9, 10 for guiding the metal band 1 in an S shape, The first rolls 7 and 9 of the S-roll units 5 and 6 are arranged in position, and the second rolls 8 and 10 of the S-roll units 5 and 6 are the first rolls. Is arranged to be movable relative to (7, 9), The second rolls 8, 10, which are movably disposed with respect to the first rolls 7, 9, are rotatably arranged with the rotary arm 11 and the rotary arm 11 has a spatially fixed axis to one side. Located within 12, The spatially fixed axis 12 corresponds to the axis of rotation of the first rolls 7, 9, A linear actuator 14 is flexibly disposed on the rotation arm 11 in the rotation point 13 spaced apart from the spatially fixed axis 12, The rolling point (13) is a rolling system for rolling metal bands, characterized in that it is located on the connecting line between the rotational axes of the two rolls (7, 9; 8, 10). The rolling system of claim 1, wherein the linear actuator (14) is a hydraulic piston-cylinder-system. Rolling system according to claim 1, characterized by means for driving at least one roll (7, 8, 9, 10) of the S-roll unit (5, 6). The rolling system for metal band rolling according to claim 1, which is formed as a cold rolling system. The rolling system for rolling metal bands according to claim 1, wherein the roll stand (2) is provided as a single stand. The rolling system for rolling metal bands according to claim 1, wherein the roll stand (2) is provided with means for flexibly adjusting the rolling gap. The rolling system for rolling metal bands according to claim 1, wherein the at least one winch part (3, 4) is provided with means for controlling the rotation speed. delete delete delete

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