DE102018209664A1 - Reduced wear on coil box rolls - Google Patents

Abstract

Device and method for winding and / or unwinding a strip (1), preferably for winding a metal strip into a coil (2) in metal processing, the device comprising: a plurality of rolls (10a, 10b, 11, 20a, 20b) which are set up in order to be in contact with the belt (1) at least at times, at least one of the rollers (10a, 10b, 11, 20a, 20b) having one or more changeable manipulated variables which can be set by an adjusting device (40) ; a wear detection device (50) which is set up to determine a wear state of at least one of the rollers (10a, 10b, 11, 20a, 20b); the actuating device (40) being set up to set one or more of the manipulated variables taking into account the determined state of wear.

Description

Technical field

The invention relates to a device and a method for winding and / or unwinding a strip, preferably for winding a metal strip into a coil in metal processing.

Background of the Invention

It is known to wind a metal strip capable of winding - for example after emerging from a roll stand of a rolling mill - in a coil box to form a bundle, also referred to as a coil. The coil box usually has a plurality of bending rollers which bend the tape and in this way bring it into a position suitable for winding up, and winding rollers which usually wind up the tape without a thorn, ie with an open eye. The coil box can also have means for transporting the tape, as well as for moving and unwinding the coil. Such a coil box is for example in the DE 198 03 091 A1 described.

The rolls involved in transporting, bending and winding up the strip are exposed to different loads during the process, which means that they wear at different speeds and in different ways. So the engagement times and angle of attack of the belt change relative to the roles over time. This problem becomes more pronounced when several rollers are driven by a common drive train.

The WO 2009/097957 A1 describes a method in which the peripheral speed of the bending rollers is set to the surface speed of the metal strip at the line of contact. This allows the slip between the metal strip and the bending rollers to be reduced, but the bending rollers are still exposed to different loads - for example different engagement times, angles of attack, pressure forces, etc. - which can result in different wear behavior.

Presentation of the invention

An object of the invention is to provide a device and a method for winding and / or unwinding a strip, preferably for winding a metal strip into a coil in metalworking, which improve the wear behavior of rollers, in particular transport, guidance, bending and take-up rolls, optimize.

The object is achieved with a device with the features of claim 1 and a method with the features of claim 7. Advantageous further developments follow from the subclaims, the following description of the invention and the description of preferred exemplary embodiments.

According to the invention, the device is used for winding and / or unwinding a tape. The band is preferably a metal band. For example, the strip can be a metal strip that runs out of a roll stand and is wound up into a bundle by the device. The device has several roles. The rollers are used, for example, to transport, guide, bend, wind and / or unwind the tape and are in contact with it at least temporarily. At least one role, preferably several or all roles, has one or more changeable manipulated variables that can be set by an actuating device.

A manipulated variable is a changeable physical, preferably mechanical, property of the roller. The speed of rotation of the roller can be a manipulated variable, as can the torque, the position and / or orientation of the roller, etc. The manipulated variable can also indirectly describe the condition of the roller, for example by relating to a variable for controlling a drive of the roller. In this sense, the rotational speed of the roller, for example, is also considered as a possible manipulated variable, as is the motor torque of the drive or the excitation current for actuating the drive. If - to give another example - the spatial position of the roller is set via a hydraulic cylinder, the manipulated variable can identify the position of the roller, the position of the piston in the cylinder or the pressures for actuating the hydraulic cylinder. It is important that one or more manipulated variables can be set by a control unit, which is referred to here as an actuating device. Preferably, one or more manipulated variables are during the regular operation of the device, i.e. while winding a tape, adjustable.

The device also has a wear detection device which is set up to determine a wear state of at least one of the rollers. The state of wear comprises at least one physical property of one or more rollers that changes due to wear during the course of the operation of the device. For example, the contact of a roll with the belt over time can cause a change in profile or a change in the diameter of the roll. It should be pointed out that different rollers generally wear at different speeds and in different ways, since they are exposed to different loads, for example different times of engagement and angles of attack. This The problem arises when several rollers are driven by a common drive train. For this reason, the device preferably has a plurality of driven rollers, each of which has at least one manipulated variable that can be set by the actuating device and is driven by its own drive train. The drive train preferably comprises a drive gear, so that the driven rollers are decoupled, at least with regard to the gear, so that the different wear behavior can be taken into account. The individual drive trains preferably also have their own motors, for example electric motors, in order to further optimize the wear behavior.

Regarding the term "state of wear" it should be pointed out that this can be determined by measured values from sensors, on the basis of a theoretical wear model or by a combination of both concepts. For example, the diameter of one or more rollers can be measured continuously or at certain intervals during operation, the change over time of which is used as a determining parameter of the state of wear. As an alternative or in addition, the profiles of rolls can be measured or theoretically determined and considered in the state of wear. For this purpose, manipulated variables can be taken into account as well as the strip thickness, strip width, strip temperature, bending force, the strip weight, the strip size, etc. The wear condition determined on an experimental and / or theoretical basis is thus a measure of the wear of one or more rollers.

The actuating device is set up in such a way that it changes one or more manipulated variables, taking into account the determined state of wear. In other words: The control of one or more rollers, for example the setting of rotational speeds and / or the chronological course of the opening of bending rollers and / or the lowering of winding rollers etc., takes place taking into account the determined state of wear.

The wear behavior can be optimized in this way. In particular, the wear of different rollers can be evened out, which increases their operating time and also reduces maintenance times and times in which the device is at a standstill due to wear. The wear optimization, insofar as it includes bending rollers and / or winding rollers, also contributes to an improvement in the collar eye diameter, the ovality of the collar and the collar opening sequence. Production security is improved by reducing the cobbler rate. The associated improvement in wear prediction also improves downtime and spare parts planning.

The wear behavior can be optimized by readjusting the setting values of the roller drives on the basis of the measured and / or otherwise determined wear on different rollers, for example based on the different engagement times, bandwidths and the loads that occur, as well as the input roller shape, i.e. the original roll shape before the wear-related change, and the roll base material.

A typical wear behavior, especially on hot strip mills, is known under the name "coffin profile". This means the tendency that due to a higher load in the middle than at the edges (seen in the axial direction), rollers wear faster in the middle than at the edges, which creates a concave wear profile. Such wear behavior can be counteracted by applying layers of different hardness along the axial extent of the roller. Another measure, which relates to a preferred embodiment, is to achieve an equalization of the load distribution due to the bandwidth fluctuation by a lateral displacement of the roller. In this case, a measure of the lateral position or displacement of the roller is a manipulated variable in the sense defined above, which can be adjusted via the actuating device, taking into account the state of wear.

The method according to the invention is used like the device for winding and / or unwinding a strip, preferably for winding a metal strip in metal processing. The technical effects, preferred exemplary embodiments and contributions to the prior art, which have been described in relation to the device, apply analogously to the method.

The device and the method are particularly suitable for optimizing the wear of bending rolls and / or winding rolls in coil boxes. But the invention can also be implemented in other areas, for example to optimize wear on transport rollers, guide rollers, unwinding rollers, etc.

Further advantages and features of the present invention are evident from the following description of preferred exemplary embodiments. The features described there can be implemented on their own or in combination with one or more of the features set out above, insofar as the features do not contradict each other. The following description is more preferred Exemplary embodiments are carried out with reference to the accompanying drawings.

list of figures

• The 1 to 6 schematically show the arrangement of bending and winding rolls of a coil box in the course of winding a metal strip.

Detailed description of preferred embodiments

Preferred exemplary embodiments are described below with reference to the figures. The same, similar or equivalent elements are provided with identical reference numerals, and a repeated description of these elements is partially omitted in order to avoid redundancies.

The 1 shows an arrangement of bending and winding rollers in a coil box for winding a metal strip. The coil box has a group of bending rollers with two upper bending rollers 10a . 10b and a lower bending roll 11 on. The top bending roll 10b and the lower bending roll 11 define a bending gap B through which the tape to be wound 1 (see. 2 to 6 ) is passed through. The employment of the upper bending rollers 10a . 10b relative to the lower bending roll 11 is by means of an adjusting cylinder 12 variable. The lower bending roll 11 is designed to be stationary in the present exemplary embodiment, but its position can also be provided so as to be adjustable. The coil box also has two winding rolls 20a . 20b on the bundle that develops and grows during winding 2 (see. 4 to 6 ) carry and store rotatable. The employment of the winding rolls 20a . 20b is through a pitch cylinder 22 changeable.

The pitch cylinders 12 . 22 are each designed as hydraulic cylinders in the present example, but there is no restriction in this regard. The rollers can be adjusted in various ways, for example by means of an electric motor or magnetically. Furthermore, the roles can be adjusted in groups or individually.

Next to the bending rolls 10a . 10b . 11 and the take-up reels 20a . 20b can have additional roles and / or means for guiding and / or transporting the belt 1 be provided. The coil box according to the present example has a form roll, for example 30 and three contact elements 31a . 31b . 31c on that to a defined winding of the tape 1 contribute.

The pitch cylinders 12 . 22 are from an actuator 40 driven. The actuator 40 has a wear detection device described in more detail below 50 on or communicates with one.

The 2 shows a state of the coil box at the beginning of the winding process. The ribbon 1 that through the bending gap B occurs, is removed from the bending rollers during transport 10a . 10b . 11 bent so that it is with the contact element 31a comes into contact. The positions and speeds of the bending and winding rollers 10a . 10b . 11 . 20a . 20b are used by the actuator 40 controlled, whereby the rolls with their lead and lag in relation to the belt speed are brought to a certain speed and held.

The 3 shows a state in which this is due to the bending rollers 10a . 10b . 11 pre-bent tape 1 continue towards the take-up reels 20a . 20b was transported. The ribbon 1 begins to come out without a mandrel and in contact with the take-up reel 20a into a covenant 2 wind up like a comparison with the 4 shows.

When a certain collar diameter is reached, the actuating device initiates 40 opening the upper bending rollers 10a . 10b , ie the positioning cylinder 12 moves one or both of the top bending rollers 10a . 10b from the stationary bending roll 11 away, causing the bending gap B increased. The direction of the opening of the upper bending rollers 10a . 10b is in the 4 shown by an arrow.

In the further course of the winding, triggered by reaching a certain coil diameter, the actuating device initiates 40 in addition to opening the upper bending rollers 10a . 10b lowering the take-up rolls 20a . 20b to make room for the growing covenant 2 to accomplish. This is also indicated by an arrow from the 5 out.

By opening the upper bending rollers 10a . 10b the contact state of the belt changes 1 relative to the bending rolls 10a . 10b . 11 , This changes from a certain opening of the bending gap B the attachment of the tape 1 from contact with all three bending rollers 10a . 10b . 11 to contact with only two bending rollers 10b . 11 , like in the 6 shown. The change in the contact state is not only a function of time, ie the process stage, but also depends on other parameters, such as the material thickness of the strip 1 , the strip temperature and strip strength. It also shifts with the lowering of the take-up reels 20a . 20b the federal focus 2 from the take-up reel 20a and the form roller 30 little by little towards the take-up reel 20b , whereby the Contact points and contact pressures between the rollers and the belt 1 change. This can cause wear imbalances in the rollers.

In order to counteract uneven wear behavior and to reduce wear overall, the coil box has the wear detection device 50 on. This is set up to show a state of wear of one or more of the rollers 10a . 10b . 11 . 20a . 20b to investigate. The state of wear includes at least one physical property of the roll (s) in question, which changes due to wear during the operation of the coil box. For example, a profile change or a change in the diameter of one or more of the bending rollers 10a . 10b . 11 go into the state of wear. The state of wear can be determined in various ways. In particular, the state of wear can be based on a theoretical wear model and / or taking sensor data into account.

For example, the bending rollers 10a . 10b . 11 Sensors can be assigned which measure one or more parameters suitable for determining the state of wear - such as the roller diameter, the roller profile, the speed of rotation, etc. The sensors communicate with the wear detection device 50 , which in turn determines a state of wear from the sensor data and, if necessary, taking into account a theoretical model. The actuator 40 is now set up so that it changes the manipulated variables taking into account the determined state of wear. For example, the speeds of the bending rollers 10a . 10b . 11 and / or the time course of the opening of the upper bending rollers 10a . 10b a function of the state of wear, such as the measured roll diameter.

In this way, the wear behavior of the rollers can be optimized. In particular, the wear of different rolls can be evened out, which increases their operating time, as well as maintenance times and times in which the coil box comes to a standstill due to wear. The wear optimization also helps to improve the collar eye diameter, the ovality of the collar 2 and the federal opening sequence. Production security is improved by reducing the cobbler rate. Furthermore, a more precise wear forecast is possible, which contributes to an improvement in downtime and spare parts planning.

The wear detection device ( 50 ) is preferably set up to determine the state of wear, taking into account measured values measured by one or more sensors, the measured values preferably comprising one or more variables from the following selection: rotational speed of one or more of the rollers ( 10a . 10b . 11 . 20a . 20b) ; Torque of one or more of the rollers; Change in rotational speed of one or more of the rollers; Torque change of one or more of the rollers; Profile of one or more of the roles; Changing the profile of one or more of the roles; Diameter of one or more of the rollers; Change in diameter of one or more of the rollers; Location and / or orientation of one or more of the rollers; Strip thickness; bandwidth; Strip temperature; Bending force; Coil weight; Bund size.

The control device ( 40 ) adjustable manipulated variables preferably include one or more variables from the following selection: rotational speed of one or more of the rollers ( 10a . 10b . 11 . 20a . 20b) ; Torque of one or more of the rollers; Pre- and / or lag factor of one or more of the roles; Location and / or orientation of one or more of the roles.

The roles ( 10a . 10b . 11 . 20a . 20b) preferably comprise a plurality of driven rollers, each of which has at least one manipulated variable that can be set by the adjusting device ( 40 ), and can be driven by a separate drive train (not shown in the figures), which preferably has a drive gear and / or a motor.

As far as applicable, all individual features that are shown in the exemplary embodiments can be combined with one another and / or exchanged without leaving the scope of the invention.

LIST OF REFERENCE NUMBERS

1

tape

2

Federal / Coil

10a, 10b

Upper bending rolls

11

Lower bending roll

12

Adjusting cylinder for the upper bending rollers

20a, 20b

winding rolls

22

Positioning cylinder for the winding rollers

30

forming roller

31a, 31b, 31 c

contact elements

40

setting device

50

Wear detection device

B

bending gap

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 19803091 A1 [0002]
• WO 2009/097957 A1 [0004]

Claims (12)

Device for winding and / or unwinding a strip (1), preferably for winding a metal strip into a coil (2) in metal processing, the device comprising: a plurality of rollers (10a, 10b, 11, 20a, 20b) which are set up to be in contact with the belt (1) at least at times, at least one of the rollers (10a, 10b, 11, 20a, 20b) having one or has a plurality of changeable manipulated variables which can be set by an actuating device (40); a wear detection device (50) which is set up to determine a wear state of at least one of the rollers (10a, 10b, 11, 20a, 20b); in which the actuating device (40) is set up to set one or more of the manipulated variables taking into account the determined state of wear. Device after Claim 1 , characterized in that the actuating device (40) is set up to set one or more of the manipulated variables which are to be set taking into account the determined wear state during the regular operation of the device. Device after Claim 1 or 2 , characterized in that the wear determining device (50) is set up to determine the state of wear taking into account measured values measured by one or more sensors, the measured values preferably comprising one or more variables from the following selection: rotational speed of one or more of the rollers (10a, 10b, 11, 20a, 20b); Torque of one or more of the rollers; Change in rotational speed of one or more of the rollers; Torque change of one or more of the rollers; Profile of one or more of the roles; Changing the profile of one or more of the roles; Diameter of one or more of the rollers; Change in diameter of one or more of the rollers; Location and / or orientation of one or more of the rollers; Strip thickness; bandwidth; Strip temperature; Bending force; Coil weight; Bund size. Device according to one of the preceding claims, characterized in that the wear detection device (50) is set up to calculate the wear state on the basis of a wear model or taking model parameters into account. Device according to one of the preceding claims, characterized in that the manipulated variables adjustable by the adjusting device (40) comprise one or more variables from the following selection: rotational speed of one or more of the rollers (10a, 10b, 11, 20a, 20b); Torque of one or more of the rollers; Pre- and / or lag factor of one or more of the roles; Location and / or orientation of one or more of the roles. Device according to one of the preceding claims, characterized in that the rollers (10a, 10b, 11, 20a, 20b) comprise a plurality of driven rollers, each of which has at least one manipulated variable, adjustable by the actuating device (40), and of its own drive train, which preferably has a drive gear and / or a motor, can be driven. Method for winding and / or unwinding a strip (1), preferably for winding a metal strip into a bundle (2) in metal processing, the method comprising: Transporting, guiding, bending, winding and / or unwinding the tape (1) by means of a plurality of rollers (10a, 10b, 11, 20a, 20b) which are in contact with the tape (1) at least temporarily; Setting one or more manipulated variables of at least one of the rollers (10a, 10b, 11, 20a, 20b) by means of an adjusting device (40); Determining a state of wear of at least one of the rollers (10a, 10b, 11, 20a, 20b) by means of a wear detection device (50); wherein the adjusting device (40) adjusts one or more of the manipulated variables taking into account the determined state of wear. Procedure according to Claim 7 , characterized in that the adjusting device (40) adjusts one or more of the manipulated variables which are set taking into account the determined wear condition during the regular operation of the device. Procedure according to Claim 7 or 8th , characterized in that the wear determining device (50) determines the state of wear taking into account measured values measured by one or more sensors, the measured values preferably comprising one or more variables from the following selection: rotational speed of one or more of the rollers (10a, 10b, 11, 20a, 20b); Torque of one or more of the rollers; Change in rotational speed of one or more of the rollers; Torque change of one or more of the rollers; Profile of one or more of the roles; Changing the profile of one or more of the roles; Diameter of one or more of the rollers; Change in diameter of one or more of the rollers; Location and / or orientation of one or more of the rollers; Strip thickness; bandwidth; Strip temperature; Bending force; Coil weight; Bund size. Procedure according to one of the Claims 7 to 9 , characterized in that the wear determining device (50) indicates the state of wear calculated on the basis of a wear model or taking model parameters into account. Procedure according to one of the Claims 7 to 10 , characterized in that the manipulated variables adjustable by the adjusting device (40) comprise one or more variables from the following selection: rotational speed of one or more of the rollers (10a, 10b, 11, 20a, 20b); Torque of one or more of the rollers; Pre- and / or lag factor of one or more of the roles; Location and / or orientation of one or more of the roles. Procedure according to one of the Claims 7 to 11 , characterized in that the rollers (10a, 10b, 11, 20a, 20b) comprise a plurality of driven rollers, each of which has at least one manipulated variable, which can be set by the actuating device (40), and of its own drive train, which is preferably a drive gear and / or has a motor driven.

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