EP3086901A2

EP3086901A2 - Roll grinding device and method for grinding a roll

Info

Publication number: EP3086901A2
Application number: EP14823988.2A
Authority: EP
Inventors: Stephan Draese; Jan Hendrik HOLTZ; Gernot NITZSCHE
Original assignee: Hydro Aluminium Rolled Products GmbH
Current assignee: Speira GmbH
Priority date: 2013-12-23
Filing date: 2014-12-22
Publication date: 2016-11-02
Anticipated expiration: 2034-12-22
Also published as: EP3086901B1; WO2015097146A2; EP3086901C0; JP6337125B2; WO2015097146A3; ES2951593T3; CN105848826B; CN105848826A; JP2017500216A

Abstract

The invention relates to a method for grinding a roll (20) by means of a roll grinding device (10). In said method, a roll (20) is ground by means of a grinding tool (40) of the roll grinding device (10), at least one measurable value of at least one variable that relates to the surface quality of the roll (20) is measured during the grinding operation, and at least one operating parameter of the roll grinding device (10) is adjusted during the grinding operation in accordance with the measured variable. The invention further relates to a roll grinding device (10) for grinding a roll (20), comprising a roll mount (30) that includes two bearings (32, 34) designed to rotatably support the roll (20), also comprising a drive (36) designed to rotatingly drive the roll (20) at an adjustable roll speed, as well as a grinding tool (40) designed to accommodate and rotatingly drive a grinding member (42) at an adjustable grinding member speed and position the grinding member (42) against the roll. The roll grinding device (10) further comprises a measuring apparatus (70) designed to measure measurable values of a variable that relates to the surface quality of the roll (20), as well as a control unit (80) designed to control the roll grinding device and, during the grinding operation, trigger the measuring apparatus (70) to measure at least one measurable value, and adjust at least one operating parameter of the roll grinding device (10) in accordance with the measured variable.

Description

Roll grinding apparatus and method for grinding a roll

The invention relates to a method for grinding a roller, in particular a working, intermediate or support roller, by means of a roll grinding device.

Furthermore, the invention relates to a roll grinding device for grinding a roller.

Rollers typically have a roll bale, to which roll journals connect axially on both sides. The surface of the roll bale is referred to herein as the roll surface, since this is the surface of the roll, when rolling with the rolled product (at a work roll) or with the

Rolling surfaces of other rolls (in an intermediate or backup roll) comes into contact. For the use of such a roll in a rolling mill, the roll necks are used in dedicated bearings of the rolling mill, so that the roller is rotatably mounted. One of the two roll necks typically has one

Terminal contour, for example, a flat, for connection to a

Rolling rotary drive on.

The quality of rolled products, for example aluminum strips or foils, depends directly on the nature of the rolls used to roll these products.

Rollers therefore have besides the requirements of the roll material as well

Roll Geometry Criteria, i. regarding the contour of the

Roll bale, and in terms of their surface finish, i. the goodness of

Roll surface to meet. The surface quality of the roll usually includes the simultaneous fulfillment of one or more criteria with respect to the

Surface roughness, the surface gloss, the pattern freedom and / or freedom from singular or recurrent defects in the grinding pattern of the roller. The surface finish of rolls plays a role, in particular, in the rolling of rolled products, which themselves are subject to high demands on their surface quality, since, for example, surface defects on the roll surface, such as scratches or patterns, can be transferred to the rolled product, so that it is either elaborately aftertreated or possibly even scrapped.

For this reason, the rolls of rolling mills, in particular the working, intermediate and / or back-up rolls, are regularly provided therefor

Grinder grinding ground, on the one hand to maintain the roll geometry and on the other hand, the surface quality of the roller or restore.

From the prior art are manual or semi-automated

Cylindrical grinding methods are known which are carried out on conventional or so-called CNC external cylindrical grinding machines (CNC = Computerized Numerical Control). In the semi-automated cylindrical grinding process, the

Roll geometry and the diameter of the roll CNC-supported, ie generated by electronically controlled machines. In addition, some grinding methods also attempt to approach a desired target roughness of the roll surface. However, the achievable roughness of the roll surface depends greatly on the parameters of the grinding tool, in particular a grinding wheel commonly used, the roll material, the cooling lubricant used during grinding and on the characteristics of the cylindrical grinding itself. Therefore, the prior art CNC control grinding methods can theoretically be successful in terms of the target roughness of the roll surface to be set only when the conditions on the roll, on the grinding tool, on the cooling lubrication and on the cylindrical grinding machine itself during the entire grinding process are kept constant. However, this is hardly realizable in practice, so that the desired target roughness of the roll surface depends on The experience of the operator of the grinding system can only be achieved to a certain extent.

To assist the operator in assessing the during the

Partially offline and online measuring methods are used to make manual corrections while running

To make grinding process. For this purpose, for example, the

Grinding process interrupted at certain intervals, so that measurements on the roller can be performed. Depending on the results of the measurements, the grinding process can then be continued by the operating personnel with the same or with changed parameters.

More recently, the requirements for the surface finish of rolled

Products continue to rise, so that correspondingly high demands for the surface quality of the rollers, especially for work rolls exist.

In the conventional or CNC-based grinding method described above, this quality is assessed visually by the operators of the grinding systems during interruptions of the grinding process or after completion of the grinding process (offline) visually and / or with metrological aids or during the grinding process (online), so that the operating personnel then manually if necessary

Take corrective action or repeat the grinding process.

However, the quality of the surface quality of the ground work rolls depends strongly on the wealth of experience of the operating personnel. In addition, particularly high surface finishes in this way can only be achieved unreliable or even partially not at all.

Prior to this prior art, the present invention has the object, a roll grinding or a method for grinding a roller for To provide, with which reliably a high surface quality of

Work rolls can be achieved.

This object is achieved at least partially by a method for grinding a roller, in particular a working, intermediate or support roller, by means of a roll grinding device, wherein a roller with a

Grinding tool of the roll grinding device is ground, in which during grinding at least one measured value of at least one measured on the surface quality of the roll measured variable is measured and in which during grinding at least one operating parameter of the roll grinding is set as a function of the measured variable.

It has been found that by capturing at least one of the

Surface quality of the roll related measurement variable during grinding, an active control of the roll grinding is possible through which the specifications for the surface finish of the roll can be better achieved. In this way, even high demands on the surface quality of the roller regardless of

Experience of the operators of the roll grinding device are met. The measured variable or a variable derived from the measured variable can be used in particular as a controlled variable of a control which is to be regulated to a predetermined or predefinable setpoint. The measurement can be used to determine an actual value of the controlled variable, which is compared to the setpoint during the control. The at least one operating parameter can preferably be used in the control as a manipulated variable, via which the control of the controlled variable takes place. The value of the manipulated variable or of the operating parameter is determined in such a control depending on the deviation of the controlled variable from the desired value and thus dependent on the measured value of the measured variable. The detection of at least one related to the surface quality of the roller

Measured variable may preferably be in addition to detecting one or more of the geometry of the roll related measured variables take place. Preferably, in this case at least one operating parameter of the roll grinding device can be set as a function of the measured quantity related to the surface quality of the roll and a measured quantity related to the geometry of the roll. In this way, at the same time the requirements for the geometry, as well as to the

Surface quality of the roller can be met.

With the method described above, it can be achieved, in particular, that the grinding process to a lesser extent influences a subjective visual

Surface assessment by the operator is subject and that scored

Grinding characteristics, in particular the achieved surface quality, to a lesser extent by the operating personnel, by the grinding tool, by the processed roll, by auxiliary materials or consumables used during grinding and / or by the

Machine characteristics of the roll grinding device depends. As a result, in particular grinding times can be saved and / or incorrect grinding can be avoided, so that the overall result is cost savings.

Furthermore, with the described method, a better reproducibility of the roll grinding of the ground roll and a reduction of tolerances with regard to the parameters of the desired roll surface can be achieved.

In the method, a roller with a grinding tool of

Roll grinding device ground. Such a grinding tool preferably has an abrasive body, in particular in the form of a grinding wheel, which rotates during grinding with an adjustable grinding wheel speed. Such a grinding wheel may for example consist of a matrix, preferably a synthetic resin matrix such as

Example of a Bakelite matrix or a ceramic matrix, with embedded

Abrasive particles, preferably corundum particles, boron nitride particles (CBN) and / or silicon carbide particles (SiC). The roller preferably becomes about its axial axis during grinding

rotationally driven, in particular with an adjustable roller speed, so that the roller surface can be processed with the grinding tool over its entire circumference. The area of the roller currently being processed by the grinding tool or the grinding body is referred to as the grinding area.

Furthermore, during grinding, the grinding tool is preferably parallel to the axial axis of the roller over substantially the entire width of the roller

Roll bale method, so that the roll surface can be processed with the grinding tool over the entire axial extent of the roll bale.

Alternatively, during the grinding, the roller can also be moved in the axial direction relative to the grinding tool. The relative velocity between the grinding tool and the roller during this movement is considered axial

Feed rate called.

During the grinding, at least one measured value of at least one measured quantity related to the surface quality of the roll is measured during the grinding. A measured quantity related to the surface quality of the roll is understood to mean a measured variable which, in contrast to variables relating to the roll geometry, such as the bale contour or the roll diameter, has an effect on the quality of the roll

Roll surface is directed, preferably on the surface roughness, the surface gloss, the pattern freedom and / or the freedom of singular or recurrent defects of the roll surface. Preferably, too

Measured values for several of these measured variables during grinding, preferably continuously, are measured.

The measurement of the at least one measured value takes place during grinding, ie while the roll surface is being ground with the grinding tool. In this way, the surface quality of the roller can be measured in the current grinding operation. Preferably, the at least one measured value is measured on at least one measuring range on the roller surface. For this purpose, the

Roll grinding device preferably a measuring device, which

is set up a measured value at such a measuring range on the

To measure roll surface. For example, the measuring device may be an optical measuring device, such as a camera or another light detector, for example, which detects light reflected or scattered by the roller surface in the measuring range and calculates a measured value therefrom. The location and size of the measuring range are in particular from that of the

Measuring device detected surface on the roll surface and of the

Relative movement of the roller to the measuring device such as due to a rotation of the roller during the measuring process dependent. The measuring area is preferably arranged in the immediate vicinity behind the grinding area, preferably at a distance of not more than 30 cm, preferably not more than 20 cm, in particular not more than 10 cm. An arrangement behind the grinding region is understood to mean that the measuring region is in a position into which a region of the roll surface passes after being processed in the grinding region. If, for example, the grinding tool moves from left to right (right to left) along the axial axis of the roller, then the measuring range is preferably arranged to the left (right) of the grinding tool.

During grinding, a plurality of measured values are preferably measured, for example at specific intervals or in a continuous manner. In this way, the surface quality during grinding at different

Measuring ranges are determined on the roll surface and / or as a function of time.

The determined measured values are preferably assigned information about the position of the associated measuring range. For this purpose, the

Roll grinding device preferably means to determine the position of the measuring area on the roll surface. For example, with a first sensor the position of the measuring device or of the measuring range in the axial direction are determined (z-coordinate). Furthermore, with a second sensor, in particular an angle sensor, the angle of rotation of the roller or the position of the measuring range in the circumferential position can be determined (c-coordinate). A measured value measured in a measuring range can then be assigned the respective z and c coordinates and the measured value and the associated coordinates can be stored, for example, in a data matrix. In this way, the further processing of the measured value can take place depending on the position of the measuring area on the roll surface.

In the method, at least one operating parameter of the roll grinding device is set as a function of the measured variable during grinding. This is understood to mean that at least one operating parameter is set as a function of the at least one measured value of the measured variable measured during the grinding process.

This adjustment is preferably automatic, i. without human intervention such as by the operating personnel. That way you can

Operating parameters of the roll grinding device are controlled as a function of the measured values determined during grinding, so that a control of

Operating parameters depending on the achieved during grinding

Surface quality of the roller is made possible. This can be the

To meet requirements profile of the surface finish of the roller better and more independent of the environmental conditions or of the experience of the operator. During grinding, one or more measured values of at least one measured variable relating to the roll geometry can additionally be measured and at least one operating parameter can be set as a function of this measured variable. Such a measured variable may relate, for example, to the bale contour and / or to the roll diameter. The aforementioned object is further at least partially solved by a roll grinding device for grinding a roll, in particular a working, intermediate or support roll, for example for aluminum cold rolling mills, with a roll support comprising two bearings, which are adapted for the rotatable mounting of the roll with a drive adapted to rotationally drive the roll at an adjustable roll speed, and a grinding tool adapted to receive and rotationally drive a grinding wheel with adjustable grinding wheel speed and to set the abrasive wheel to the roll, wherein the

Roll grinding device comprises a measuring device for measuring

Measured values of a measured quantity related to the surface quality of the roller are set up and the roll grinding device comprises a control device configured to control the device, wherein the control device is set up to cause the measurement of at least one measured value with the measuring device during grinding and at least one operating parameter of the roll grinding device, in particular the axial feed speed, the roller speed, the wheel speed and / or the employment of the

To adjust the grinding tool to the roller, as a function of the measured variable. The setting of the grinding tool to the roller can be determined or adjusted, for example, via the drive current (for example armature current of the motor armature) or the drive power of the rotary drive of the grinding body.

The bearings of the roll holder are preferably designed to receive the roll neck of a roll. To drive the roller with adjustable roller speed or to drive the grinding wheel with adjustable grinding wheel speed, the roll grinding device, for example, each comprise an electric motor. As abrasive grinding wheels in particular come into question.

The position of the grinding tool or of the grinding body relative to the roller means the position and / or orientation of the grinding body relative to the roller, in particular the distance to the axial axis of the roller. In a typical bale shape of the roll, the diameter of the roll varies in the axial direction. To be with the Therefore, the distance of the grinding body to the axial axis of the roller is preferably adapted to the position of the grinding tool in the axial direction of grinding body to achieve a uniform machining of the entire roll surface. In particular, the pressure with which the grinding body presses on the roll surface can also be set via the setting of the grinding body to the roll.

The roll grinding device comprises a measuring device that is set up for measuring measured values of a measured quantity related to the surface quality of the roll. Preferably, the measuring device is adapted to the

Measurements to be measured on at least one measuring range on the roll surface. With regard to the measured values relating to the surface quality of the roller, its measurement and the resulting properties of the measuring device, reference is made to the above description of the method. The measuring device is preferably designed such that the distance of the measuring device to

Roll surface is kept constant during grinding and / or that at least one axis of symmetry of the measuring device is at a fixed angle to the roll surface. In this way, the measurement accuracy or the

Comparability of different measurements can be improved. The roll grinding device further comprises one for controlling the

Roll grinding device configured control device. This may, for example, be a control device having at least one microprocessor and preferably at least one memory connected to the microprocessor. The control device is configured to cause the measuring of at least one measured value with the measuring device during grinding and at least one operating parameters of the roll grinding device, in particular the roller speed, the grinding wheel speed, the direction of rotation of the roller and / or the grinding wheel, the axial feed rate and / or Setting the grinding tool as a function of the measured variable. Below this is

understood that the at least one operating parameter depends on the at least one measured value of the measured variable measured during grinding is set.

In this way, the roll grinding device described, one or more surface quality related to the measured variables during the current

To grasp grinding process and to control the operating parameters of the roll grinding with the measurements of these metrics, so that an active control of relevant for the roll surface quality operating parameters and thus achievable with the roll grinding surface quality of the ground rolls can be improved.

The roll grinding device described above is preferably used for

Implementation of the method described above. In the following, various embodiments of the roll grinding apparatus described above and the method described above will be explained. The individual embodiments apply in full for both the

Roll grinding device as well as for the process, even if individual

Embodiments will be described primarily for the roll grinding device or the method.

In one embodiment of the roll grinding device is the

Control device configured to perform the method described above and / or an embodiment of the method described above or below. For this purpose, the control device a

Microprocessor and an associated memory with commands whose execution by the microprocessor causes the implementation of one of the method or the respective embodiment of the method. In one embodiment of the method, during grinding at least one measured value is at least one on the surface roughness of the roller and / or measured at least on a pattern formation on the roll surface measured variable, in particular with an optical measuring method.

As come on the surface roughness of the roll related measures

in particular the following variables into account: R _a, R _q, R _z, Rsk, Rdq, RPC (in each case in accordance with DIN EN ISO 4287), S _a, S _q, S _z, S _S k, S _dq, S _ds (each by ISO 25178), A _q , A _sk , A _qm (in each case in accordance with VDA 2009 "Angle-resolved scattered light measurement")., For example, during grinding at least one measured value of one or more of the aforementioned measured variables can be measured several of the measured variables A _q , A _S k, A _square , which by an optical measuring method, in particular by a scattered light or

Reflectivity measurement method can be determined. In particular, a continuous measurement of these variables is possible. Typical target values for the surface roughness of rolls can be, for example, for the measured variable R _a in the range of 0.01 μπ to 1 μη.

The measured variables related to the surface roughness of the roll, such as A _q or A _qm , can be influenced or determined in particular by the axial feed rate, the setting of the grinding tool or by the speed ratio between the roll and the grinding body in the grinding area. For example, a reduction of the axial feed rate and / or the delivery can lead to lower roughness. Preferably, therefore, at least one of the operating parameters axial feed rate, adjustment of the grinding tool, roller speed, wheel speed, roller rotation and / or grinding direction as a function of at least one of the

Surface roughness of the roll related measured variable, such as A _q or A _qm set.

For example, the following measured variables can be used as measured quantities related to a pattern formation on the roll surface: measured variables which result from a Fourier transformation (eg by means of FFT) of an image acquisition from the Calculate roller surface or standard deviation of Aqm, in particular determined over a limited range in the axial direction. It has been found, for example, that patterns on the roll surface lead to a greater variation in the Aqm value, so that patterns on the roll surface can be recognized, for example, by the standard deviation of A _qm exceeding a predetermined limit. Furthermore, a measured quantity related to the vibration state of the roll and / or the roll grinding device can also be used to monitor the formation of patterns on the roll surface. In particular, a deviation of the oscillation spectrum of a

predefined oscillation spectral range, which corresponds, for example, to the range of normal oscillation spectrums during normal operation of the roll grinding device, which indicate a risk of pattern formation on the roll surface.

The selection of the one or more on the surface quality, in particular on the surface roughness of the roller related measures, to which during the

Grinding one or more measured values to be measured, is preferably carried out depending on the material of the roll, the application in the rolling stand, i. a) roll stand type and / or b) roll type [e.g. Working, intermediate or back-up roll), the manufacturing step in which the roll is to be used (e.g., pre-stitch, inter-stitch or finish stitch) and / or specific properties of the roll product to be produced with the roll (e.g., thickness, gloss and / or roughness).

The measurement is preferably carried out with an optical measuring method, for example by means of an optical scattered light or reflectivity measurement, in which light is radiated from a light source onto the roll surface and that of the

Roll surface reflected or scattered light with a light detector is preferably detected depending on the angle. Alternatively or additionally, images of the roll surface can also be recorded with an image acquisition device and examined for recurring patterns. This can be done, for example, by a Fourier transformation of the image data captured by the camera. By the Using an optical measuring method, the measured values can be determined without contact, so that on the one hand the roll surface and on the other hand the measuring device used for the measurement are not affected by the measurement. Furthermore, these optical measurements are possible in the current grinding process. As an alternative or in addition, the following measuring methods or the use of measuring devices set up for this purpose are also used

Determination of surface roughness of the roll into consideration: laser triangulation or confocal chromatic measurements using confocal chromatic

Point sensors.

In a corresponding embodiment of the roll grinding device, this has a measuring device for measuring measured values of a on the

Surface roughness and / or at least a pattern formation on the

Roller surface related measured variable is set up, in particular an optical measuring device.

An overview of possible measuring methods and definitions of the associated

Measurands relating to the characteristics of the microstructure of a surface can also be found in the article by R. Brodmann et al., QZ Vol. 53, No. 7, 2008, pages 46-49, the contents of which are fully incorporated herein by reference

Disclosure content is included.

In a further embodiment of the roll grinding device is the

Measuring device adapted to each during grinding a in the

Substantially stationary position relative to the grinding tool exhibit. In a corresponding embodiment of the method, the measurement of

Measured values of the at least one measured quantity related to the surface quality of the roller during grinding, each in a substantially fixed spatial position relative to the grinding tool. For this purpose, the measuring device may, for example, be motion-coupled with the grinding tool, so that the

Measuring device with a movement of the grinding tool moves accordingly becomes. In this way it can be achieved that the measured values recorded during grinding stand in a fixed relationship to the grinding process.

For example, the measuring device can be arranged relative to the grinding tool so that a machined by the abrasive body surface portion of

Roll surface passes at a predetermined relative axial velocity of the grinding tool to the roller after a certain time in the measuring range of the measuring device. Such a fixed temporal relationship between the

Processing and the measurement on a surface portion of the roll surface usually simplifies the adjustment of the operating parameters as a function of the corresponding measured variable.

The relative spatial position of the measuring device or the measuring position relative to the grinding tool is preferably adapted to the machining direction in such a way that the measuring area is arranged behind the grinding area.

Preferably, the roll grinding device has an adjustment mechanism which is set up to move the measuring device during a change in sign of the axial feed rate such that the measuring range is also arranged after the change of sign of the feed rate behind the grinding region. In this way it is achieved that regardless of the sign of the axial feed rate, i. For example, regardless of whether the grinding tool moves relative to the roller in one or the other direction parallel to the axial axis, the measuring range is arranged behind the grinding area, so that can be measured in the measuring area, the recently processed by the grinding tool surface.

The measuring device is preferably arranged in the region of the grinding tool, for example laterally, above or below the grinding tool. Preferably, the measuring device is less than 50 cm, preferably less than 35 cm, in particular less than 20 cm from the grinding tool spaced. Accordingly, the measuring range on the roller surface detected during the measurement is preferably arranged in the region of the grinding tool processed area, preferably with a distance of less than 50 cm, preferably less than 35 cm, in particular less than 20 cm. In this way, the determined measured values are in close spatial and temporal relationship to the area of the roll surface machined by the grinding tool, so that the measured values contain representative and timely information about the surface quality of the roll. As a result, a lower latency of the control is achieved, so that against deviations between the targets and the measured values measured in a shorter time can be countered.

This embodiment is particularly advantageous for working, intermediate or back-up rolls of a rolling mill, since these rolls typically have bales of up to 2.50 m and a diameter of up to 1300 mm. The processing of the entire roll surface by the grinding tool therefore takes a certain time, which may already be too long as a latency for the regulation of the operating parameters. Due to the stationary and / or local arrangement of

Measuring device to the grinding tool significantly shorter latencies in the control can be achieved. In a further embodiment of the roll grinding device, the latter has a cleaning device which is set up to clean the measuring region detected by the measuring device before carrying out the measurement. In a corresponding embodiment of the method, the roll surface area detected during the measurement is cleaned prior to the measurement. When grinding is

Typically, a grinding emulsion is added to the roller, which the

Roller surface covered. Furthermore, other contaminants, such as sanding abraded particles of the roll material or abrasive article, can soil the roll surface. The grinding emulsion or the further impurities can measure the roll surface

complicate or falsify, especially in optical measuring methods, since the at this method is irradiated to the surface of the roll irradiated by the grinding emulsion or the contaminants or diffused scattered.

By cleaning the surface detected during the measurement before measuring, the measurement can be facilitated and the measurement errors reduced. By the cleaning is preferably achieved that the surface before measuring each having constant optical properties, which in particular do not vary from measurement to measurement. Preferably, for this purpose, a substantially residue-free roll surface or one with a uniform thin film, e.g. a thin coolant film or rolling oil film, covered roll surface achieved. For cleaning, the roll surface in the area to be measured

For example, be freigerakelt, for example, by a designated squeegee. The squeegee, for example, substantially plastic or rubber, preferably with a hardness in the range of 55 to 90 Shore-C (according to DIN EN ISO 868), exist so as not to damage the roll surface. To improve the cleaning result, the squeegee is preferably inclined at an angle in the range of 15 ° and 45 ° in the direction of rotation of the roller, so that the roller surface moves through the roller rotation to an acute angle of the squeegee. At the aforementioned angle is at a contact point of the blade with the

Roll surface of the angle between the roll surface normal and the squeegee level understood. Consequently, a squeegee standing perpendicular to the roll surface would have the angle 0 °. Alternatively, the grinding emulsion or the

Impurities are also blown off or sucked off, in particular by a designated blow-off or suction tool. In addition to or instead of an inclination of the doctor blade, the side surface of the doctor blade facing the roller surface can also be chamfered with a corresponding angle. In this case, the doctor blade can also be aligned perpendicular to the roll surface.

In a further embodiment of the method, one or more of the following operating parameters are controlled as a function of the at least one measured variable: roller speed, wheel speed, direction of rotation of the roller and / or of the grinding wheel, axial feed rate, adjustment of the grinding tool to the roll or volume flow of a grinding emulsion used.

In one embodiment of the method, a controlled variable for the

Pattern formation on the roll surface, especially for the local

Roughness deviation AA _q (c, z), regulated, preferably over one or more of the following manipulated variables; the power of the drive for the grinding wheel, in particular the grinding current I (c, z) or the grinding current change AI (c, z), the pressure of an abrasive body of the grinding tool on the roller, the relative position of the grinding tool to the roller, preferably the delivery of the Grinding tool, in particular the position a _u and / or a _{e of} a drive for the fine adjustment of the employment of the grinding tool, and / or a dependent of one or more of these control variables operating parameters. It has been shown that these manipulated variables are well suited to patterning on the roll surface

counteract.

In one embodiment, a controlled variable for the roughness of the roller in the axial direction, in particular A _q (z), regulated, preferably via one or more of the following control variables: the relative position of the grinding tool to the roller, preferably the delivery of the grinding tool, in particular the position a _u and / or a _{e of} a drive for fine adjustment of the employment of

Abrasive tool, and / or dependent on this manipulated variable

Operating parameters. It has been found that these manipulated variables are well suited for effecting a uniform roughness in the axial direction of the roller. Furthermore, to set A _q (z) is also a change in the axial

Feed rate Vf _a conceivable.

In one embodiment, a controlled variable for the average roughness of the roller, in particular _Äq , is regulated, preferably via one or more of the following control variables: the relative position of the grinding tool to the roller, preferably the infeed of the grinding tool, in particular the position _ae and / or _{u u} a drive for coarse adjustment or fine adjustment of

Adjustment of the grinding tool, the rotational speed v _{w of} the roller, the feed speed Vf _{a of} the roller or of the grinding tool in the axial direction, the rotational speed v _{c of} an abrasive body of the grinding tool and / or one of one or more of these manipulated variables dependent operating parameters. It has been found that these manipulated variables are well suited for achieving a desired average target roughness of the roll surface.

Instead of the above-mentioned controlled variables for roughness A _q, so AA _q (c, z), A _q (z), Ä _q etc., the corresponding controlled variables may be used to roughness AQM principle, so AA _qm (c, z) , A _qm (z), Ä _qm etc. Thus, it is possible, in particular at a high measuring frequency of the roughness values A _q , to average over a series of roughness values before they are used for control.

In a further embodiment of the method, during grinding at least one measured value of a measured variable related to the vibration state of the roller and / or the roll grinding device is measured and at least one operating parameter of the roll grinding device is set as a function of this measured variable. It has been found that, depending on the operating parameters of the grinding process, such. B. the rolling speed or the grinding wheel speed, natural frequencies of the roller or the roll grinding device can be excited, so that there are excessive vibrations of the roller or the

Roll grinding device can come. This can lead to the formation of patterns on the roll surface during grinding and thus to a deterioration of the surface quality of the roll. By capturing the

Vibration state of the roll or the Walzenschleifvorrichtung and the corresponding control of the operating parameters, for example by changing the roller speed and / or the grinding wheel speed, the vibrations and thus the risk of pattern formation can be reduced overall. For determining the vibration state of the roller and / or the

Roll grinding device or parts thereof, for example

Acceleration sensors are used in different directions.

In particular, the vibration states of the following components of a roll grinding device can be measured: the vibration state of the

Spindle bearing, i. the shaft on which the abrasive body is mounted, such as a grinding wheel in the grinding tool, the vibration state of

Swivel head, i. of the movable relative to the roller part of the

Grinding tool, in which the grinding body is mounted, the vibration state of the grinding wheel drive and / or the vibration state of a setting stick, i. a provided for supporting a roll neck of the roller component. For the

Determination of the vibration state of the spindle bearing can

Acceleration sensors are arranged for example in or on the spindle. In addition to this, the data of a grinding wheel balancing unit integrated in the grinding tool can also be used directly in the analysis of the

Vibration state are included.

In a further embodiment of the roll grinding device, the latter has a temperature sensor which is set up to determine a temperature of at least one of the two bearings (storage temperature), and the control device is set up to set at least one operating parameter of the roll grinding device as a function of the storage temperature. At a corresponding

According to an embodiment of the method, the roll is rotatably mounted in at least one bearing of the roll grinding device, at least one measured value of the storage temperature is measured during grinding and at least one operating parameter of the roll grinding device is set as a function of the storage temperature.

Upon rotation of the roll during the grinding process, there may be warmed up due to friction in the bearing, even though the rolling pins are typically stored in the bearing of a roll grinding apparatus in a lubricant such as a lubricating oil or grease. It turns out that these are from the Depending on the rolling speed dependent heating to thermal expansions of the bearing, the lubricant or the roller, which may have an influence on the position of the roller relative to the grinding tool and thus on the grinding action of the grinding tool on the roll surface. This can result in an irregular and / or degraded surface finish. By capturing and

Taking into account the storage temperature in the adjustment of the operating parameters of the roll grinding, these effects can be compensated and thereby the

Surface quality of the roller can be improved. In addition to classic

Lubricant bearings are also roll grinding devices with so-called minimum quantity cooling lubrication systems (oil mist lubrication) for the roller bearings.

Also in these camps is preferably carried out a monitoring of the temperature. A regulation can be applied to the bearings via the lubrication amount, the valve timing, the

Valve opening time and / or the amount of air done. In a further embodiment of the method, the grinding of the roll takes place in several transitions of the grinding tool via the roll surface.

A transition of the grinding tool over the roller surface is understood as a method step in which essentially the entire

Roll surface is processed by the grinding tool. For example, if the roller rotates during grinding, a portion of the roller surface can be machined over the entire circumference of the roller by the grinding tool. In addition, if the rolling tool is moved relative to the roll in the axial direction over the entire axial extension of the roll bale, then the entire roll surface of the roll can be processed by the grinding tool bit by bit. In such a typical motion configuration, under a transition of the

Grinding tool on the roll surface understood the complete axial traversing the axial extent of the roll bale. Typically, the grinding of the roller takes place in several transitions of the

Grinding tool over the roll surface. The operating parameters of Roll grinding device or its permissible working or variation ranges can be specified individually for the individual transitions or for groups of transitions. It is conceivable, for example, that operating parameters for a first group of transitions are set in order to fulfill preselections with regard to the roll geometry, ie in particular with regard to the bale contour and / or the roll diameter (pre-grinding), and operating parameters are set for a second group of transitions, primarily to fulfill specifications regarding the surface quality (finish grinding). According to a further embodiment of the method, the grinding takes place

Roller in multiple transitions of the grinding tool across the roller surface and the total number of transitions is set during grinding as a function of the at least one measured quantity related to the surface finish of the roller. It has been found that, depending on the nature of the abrasive tool and the roller, the number of transitions required to achieve the desired surface finish of the roller may vary. For example, in a first roller, a larger number of transitions may be required to achieve a certain surface finish than a second roller. With the embodiment described above, the number of transitions required during the process can be determined dynamically and adjusted accordingly by detecting the surface finish of the roller. As a result, for example, superfluous transitions can be avoided and thus the number of transitions can be minimized. In this way, the roll grinding can be reduced during grinding, so that the life of the rollers, in particular the number of possible grinding processes on the roller, is increased.

In a further embodiment of the method, the grinding of the roller takes place on the basis of a predetermined grinding program with a plurality of successive grinding steps, wherein each grinding step takes place at least one transition of the

Grinding tool on the roll surface with associated operating parameters During grinding, a surface characteristic value is determined as a function of the at least one measured quantity related to the surface quality of the roller and, depending on the surface characteristic value, a jump takes place within the grinding program to an earlier or later grinding step. In which

The surface characteristic value may be a value calculated from one or more measured variables related to the surface quality of the roller.

In a further embodiment of the method, the grinding of the roll is carried out in the previous grinding step or in the previous one, depending on the change in a measurement or controlled variable related to the surface roughness of the roll

Grinding steps. In this way, the roughness development before the current grinding step can be taken into account. This is beneficial, depending on

Walzene property may have a different Einlättungsverhalten the roll surface. By taking into account the change of one to the

Surface roughness of the roll related measured or controlled variable in the previous grinding step or in the previous grinding steps can in particular a

Extrapolation of the expected mean A _q value due to the

previous surface development done. Typically, a grinding program includes various grinding steps such as pre-grinding and finish grinding. Pre-grinding or

Finished grinding can each include a plurality of grinding steps. In the individual transitions of the grinding tool via the roller surface, the operating parameters are preferably adjusted depending on the respective grinding step or of the respective transition, that certain properties of the roller are achieved with the grinding step, such as a certain

Roll geometry during pre-grinding and a certain surface finish during finish grinding. During grinding, it may be due to disturbances, for example

Vibrations, patterning or deviations from the desired Surface quality of the roller come. In particular, for example due to a faulty abrasive body singular errors on the roll surface occur, which can not be resolved within the remainder of the grinding program under certain circumstances. With the embodiment of the method described above, such errors can be dynamically detected during grinding so that, for example, a return to a previous grinding step within the grinding program can be made, which allows a correction of the error within the remaining grinding program. By the embodiments described above, the grinding process in

Regarding the requirements on the surface quality, preferably taking into account the influences of the roll grinding device, in particular the grinding tool, the roller and / or the auxiliary and lubricants used in the grinding process. In particular, one of

operator-independent influences more independent or independent regulation of the method possible.

For the determination of the surface characteristic value, it is possible in particular to use the following measured variables which are suitable, one in the remaining one

Indicate one or more oscillation amplitudes of the roll, the roll grinding device or a part thereof, the local standard deviation of the A _m value, a measured quantity related to a pattern formation on the roll surface. Preferably, a jump to an earlier grinding step is effected when

a) one or more oscillation amplitudes exceed one or more predetermined limit values,

b) the local standard deviation of the A _qm value is a given value

Exceeds limit and / or

c) a measured quantity related to a pattern formation on the roll surface comprises the presence of a pattern, in particular a feed pattern indicates the roll surface, although the target roughness of the roll surface has already been reached, especially if no further transition is provided.

The grinding step to be jumped back to is preferably selected depending on the type of a pattern recognized on the roller surface. In the case of a feed pattern, for example, a jump to a first

Grinding step of finish grinding to be jumped. Under a

Feed pattern becomes a spiral pattern on the roll surface

understood, which is caused by the spiral trajectory of the grinding wheel on the roll surface during the axial feed of the grinding tool or the roller.

If the vibrations of the roller or the roll grinding device become too large, a manual intervention of the operating personnel may be required.

In a further embodiment of the method, the grinding of the roller takes place in several transitions of the grinding tool via the roller surface and at least one operating parameter of a transition is set as a function of at least one measured value during an earlier transition. For example, by capturing a metric during a transition, it is possible to determine how far it reached that transition

Surface finish is removed from the surface finish target. In this way, one or more subsequent transitions can then be controlled accordingly. In this way, a dynamic adaptation is subsequent

Transitions to the actual deviation of the surface finish from the target possible.

In another embodiment, the grinding of the roll takes place in several transitions of the grinding tool via the roll surface and during a transition, at least one operating parameter, preferably one of the Operating parameters roller speed, wheel speed, direction of rotation of the roller and / or the grinding wheel, axial feed rate, adjustment of the grinding tool to the roller and / or flow rate of a used

Grinding emulsion, varies within specified limits.

Previous methods of grinding rolls have attempted to keep the individual operating parameters as constant as possible during a transition in order to avoid the formation of patterns on the roll surface. However, it has been found that this can only be achieved to a certain extent, so that remaining variations can still lead to patterns on the roll surface. With the embodiment described above, a completely different approach is followed by targeted variations of at least one

Operating parameters are performed within predetermined limits. It has been found that through these targeted variations, regular patterns caused, for example, by unintended operating parameter variations or

Vibrations of the roller or the roll grinding device can be caused, reduced or even avoided. The variation of the at least one operating parameter takes place within predefined limits, since a grinding process outside these limits could cause damage to the roll surface or at least a deterioration in the surface quality of the roll.

The predetermined limits for the variation of the at least one operating parameter are preferably set as a function of the transition. So can

For example, during pre-sanding boundaries further apart than during finish-grinding are used.

The variation of the at least one operating parameter can regularly,

for example, sinusoidal, or even irregular. Preferably, the variation of the at least one operating parameter takes place in a continuously differentiable manner. Furthermore, the amplitude and / or frequencies of the variations and / or their shape and / or frequency preferably as a function of

measured values measured on the surface quality related measured variable determined.

In one embodiment of the method, a control variable for the

Vibration state of the roll grinding device, in particular the

Vibration spectrum F _m , regulated, preferably via one or more of the following control variables: the frequency and / or the amplitude of a variation of one or more operating parameters, in particular the frequency f _vw and / or the amplitude A _{w of} a variation of the rotational speed v _w of Roller and / or the frequency f _vc and / or the amplitude A _{vc of} a variation of the rotational speed v _{c of} an abrasive body of the grinding tool, and / or a dependent of one or more of these control variables operating parameters. It has been shown that these manipulated variables are well suited to the vibration state of the

Roll grinding device to regulate so that unwanted vibrations

can be suppressed.

However, the variation of the at least one operating parameter can also be set independently of measured values. Accordingly, the above is described

Task according to the invention further at least partially solved by a method for grinding a roller, in particular a working, intermediate or support roller, by means of a roll grinding device, wherein a roller with a

Grinding tool of the roll grinding device is ground, in which the grinding of the roller takes place in several transitions of the grinding tool on the roll surface and in which during a transition at least one operating parameter, preferably one of the operating parameters roller speed, wheel speed, direction of rotation of the roller and / or the grinding body, axial

Feed rate, adjustment of the grinding tool to the roller and / or flow rate of a grinding emulsion used, is varied within predetermined limits. Likewise, the object is further achieved according to the invention at least partially by a roll grinding device for grinding a roller, in particular a working, intermediate or support roller, for example Aluminum cold rolling mills, comprising a roller support comprising two bearings adapted for rotatably supporting the roller, having a drive for guiding the roller

The rotary drive of the roll is set with adjustable roll speed and with a grinding tool, which is adapted for receiving and for rotational driving a grinding wheel with adjustable grinding wheel speed and for adjusting the grinding wheel to the roller, wherein the roll grinding device comprises a device arranged for controlling the control device, wherein the

Control device is set up, at least one operating parameter, preferably one of the operating parameters roller speed, wheel speed, direction of rotation of the roller and / or the grinding wheel, axial

Feed rate, adjustment of the grinding tool to the roller and / or flow rate of a grinding emulsion used to vary within predetermined limits. The variation of the at least one operating parameter is in particular independent of a regulation of the grinding process by means of a controlled variable.

The roll grinding device can in particular also a plurality of

Have measuring devices or measuring systems with which on the surface quality of the roll related measured quantities, in particular with respect to the roughness and / or on the pattern freedom, and / or on the roll geometry (roll shape) related measured variables can be measured. For example, a first

Measuring device for measuring a measured value for the roughness, a second

Measuring device for measuring a measured quantity for samples on the roll surface and a third measuring device, for example a mechanical probe, for

Measurement of a measured variable for the roll geometry to be provided. One

Mechanical button can basically also be used to

Recognize vibration-induced ripples of the roll surface.

In the following, further embodiments 1 to 19 of the method and the roll grinding apparatus are described: Method for grinding a roll, in particular a working, intermediate or support roll, by means of a roll grinding device, in particular a roll grinding device according to one of embodiments 15 to 19, in which a roll is ground with a grinding tool of the roll grinding device,

in which at least one measured value of at least one measured quantity related to the surface quality of the roll is measured during grinding and in which during grinding at least one operating parameter of the

Roll grinding device is set as a function of the measured variable. Method according to embodiment 1,

characterized,

during grinding at least one measured value of at least one on the surface roughness of the roller and / or at least one

Patterning measured on the roll surface measured variable is measured, in particular with an optical measuring method. Method according to embodiment 1 or 2,

characterized,

that the measurement of measured values of the at least one on the

Surface quality of the roll related measured variable during grinding in each case in a substantially fixed spatial position relative to

Grinding tool is done. Method according to one of embodiments 1 to 3,

characterized,

that one or more of the following operating parameters are controlled as a function of the at least one measured variable: rolling speed,

Abrasive speed, direction of rotation of the roller and / or the grinding wheel, axial feed rate, relative position of the grinding tool for Roller, in particular delivery of the grinding tool, or volume flow of a grinding emulsion used.

Method according to one of the embodiments 1 to 4,

characterized,

during grinding, at least one measured value of a measured variable related to the vibration state of the roll and / or the roll grinding device is measured and at least one operating parameter of the roll grinding device is set as a function of this measured variable.

Method according to one of embodiments 1 to 5,

characterized,

that the roller is rotatably mounted in at least one bearing of the roll grinding device, that at least one measured value of the storage temperature is measured during grinding, and that at least one operating parameter of the roll grinding device is set as a function of the storage temperature. Method according to one of the embodiments 1 to 6,

characterized,

in that the grinding of the roller takes place in a plurality of transitions of the grinding tool via the roller surface and that at least one operating parameter of a transition is set as a function of at least one measured value during an earlier transition. Method according to one of the embodiments 1 to 7,

characterized,

that the grinding of the roll takes place in several transitions of the grinding tool over the roll surface and that the total number of transitions during grinding as a function of at least one of the

Surface quality of the roll related measured variable is set. Method according to one of the embodiments 1 to 8,

characterized,

in that the grinding of the roller takes place on the basis of a predetermined grinding program with a plurality of successive grinding steps, each grinding step comprising at least one transition of the grinding tool via the roller surface with associated operating parameters, during grinding determining a surface characteristic as a function of the at least one measured quantity related to the surface quality of the roller and that depends on the surface characteristic within the

Grinding program, a jump to an earlier or later grinding step takes place.

Method according to one of embodiments 1 to 9,

characterized,

that the grinding of the roller takes place in several transitions of the grinding tool over the roller surface and that during a transition of at least one of the operating parameters roller speed,

Abrasive speed, direction of rotation of the roller and / or the grinding body, axial feed rate, relative position of the grinding tool to the roller, in particular delivery of the grinding tool, or volume flow of a grinding emulsion used is varied within predetermined limits.

Method according to one of the embodiments 1 to 10,

in which a controlled variable for the pattern formation on the roll surface, in particular for the local roughness deviation AA _q (c, z), is regulated, preferably via one or more of the following control variables: the power of the drive for an abrasive body of the grinding tool, in particular the Grinding current I (c, z) or the change of grinding current AI (c, z), the pressure of the grinding wheel on the roller, the relative position of the wheel Grinding tool to the roller, preferably the delivery of the grinding tool, in particular the position a _u and / or a _{e of} a drive for the fine adjustment of the employment of the grinding tool, and / or one of one or more of these manipulated variables dependent operating parameters.

12. Method according to one of the embodiments 1 to 11,

in which a controlled variable for the roughness of the roller in the axial direction, in particular A _q (z), is controlled, preferably via one or more of the following control variables: the relative position of the grinding tool to the roller, preferably the delivery of the grinding tool, in particular the Position a _e and / or _{u u of} a drive for coarse adjustment and / or for fine adjustment of the employment of the grinding tool, and / or an operating parameter dependent on this manipulated variable. 13. Method according to one of the embodiments 1 to 12,

in which a controlled variable for the average roughness of the roll, in particular λ _q , is regulated, preferably via one or more of the following control variables: the relative position of the grinding tool to the roll,

Preferably, the delivery of the grinding tool, in particular the position a _{e of} a drive for coarse adjustment of the setting of the grinding tool, the rotational speed v _{w of} the roller, the feed rate Vf _{a of} the roller or the grinding tool in the axial direction, the

Circulation speed v _{c of} an abrasive body of the grinding tool and / or one of one or more of these manipulated variables dependent

Operating parameters.

14. Method according to one of the embodiments 1 to 13,

in which a controlled variable for the vibration state of

Roll grinding device, in particular the vibration spectrum F _m , is regulated, preferably via one or more of the following

Manipulated variables: the frequency and / or the amplitude of a variation of one or a plurality of operating parameters, in particular the frequency f _vw and / or the amplitude A _{vw of} a variation of the rotational speed v _{w of} the roller and / or the frequency f _vc and / or the amplitude A _{vc of} a variation of the rotational speed v _{c of} an abrasive body of the grinding tool, and / or one of one or more of these manipulated variables dependent operating parameters. Roll grinding device for grinding a roll, in particular a working, intermediate or support roll, for example for aluminum cold rolling mills, arranged for execution or comprising means for carrying out the method according to one of embodiments 1 to 14. Roll grinding device for grinding a roll, in particular a working roll , Intermediate or backup roll, for example for aluminum cold rolling mills,

with a roller holder comprising two bearings adapted for rotatably supporting the roller,

with a drive for rotary drive of the roller with adjustable

Roller speed is set up,

with a grinding tool adapted to receive and rotationally drive a grinding wheel with adjustable grinding wheel speed and to set the grinding wheel to the roller,

characterized,

the roll grinding device comprises a measuring device which is set up to measure measured values of a measured quantity related to the surface quality of the roll, and

in that the roll grinding device comprises a control device set up for controlling the device, wherein the control device is set up to measure at least one during grinding

To cause measured value with the measuring device and at least one operating parameter of the roll grinding, in particular the Roll speed, the wheel speed, the axial

Feed rate and / or the adjustment of the grinding tool to the roller to set as a function of the measured variable.

Roll grinding device according to embodiment 16,

characterized,

in that the control device is set up to carry out a method according to one of the embodiments 1 to 14.

Roll grinding device according to embodiment 16 or 17,

characterized,

in that the measuring device is designed to have a substantially stationary position relative to the grinding tool during grinding.

Roll grinding device according to one of the embodiments 16 to 18, characterized

the measuring device is set up in such a way that the measuring area is arranged behind the grinding area independently of the grinding direction, so that a surface area processed by the grinding tool passes into the measuring area substantially immediately after the grinding.

Roll grinding device according to one of the embodiments 16 to 19, characterized

in that the roll grinding device has a cleaning device which is set up to clean the measuring range detected by the measuring device before carrying out the measurement.

Further features and advantages of the invention described above can be taken from the following description of embodiments, with reference to the accompanying drawings. In the drawings, a roll grinding apparatus for grinding a roll and for carrying out a method for grinding a roll, a schematic representation of the roll grinding apparatus of Figure 1 in plan a schematic representation of the roll grinding apparatus of Figure 1 in side sectional view, a schematic representation of a Reflektivitäts- or ,

Scattered light measurement on a roll surface, a diagram with an exemplary, angle-dependent intensity distribution of the reflectivity or scattered light measurement from FIG. 4 a, a schematic illustration of an image of a roll surface captured by a camera,

FIG. 5b shows a diagram with an example result of a

Fourier transformation of the image from FIG. 5a,

Figure 6 is a diagrammatic representation of a grinding program with

several grinding steps,

FIG. 7 shows a diagram with an exemplary variation of a

Operating parameters during grinding and 8 shows a schematic control diagram for a possible control of one or more controlled variables via one or more operating parameters of the roll grinding apparatus of FIG. 1. FIGS. 1 to 3 show a roll grinding apparatus 10 for grinding a roll 20. FIG. 1 shows a perspective illustration, FIG schematic representation in plan view and Figure 3 is a schematic representation in

Side sectional view corresponding to the section plane III shown in Figure 2. While the illustrations in FIGS. 2 and 3 are limited to specific components, in part in a simplified representation, for the sake of clarity, FIG. 1 shows a detailed representation of the roll grinding device 10.

The roller 20 may be, for example, a working, intermediate or support roller of an aluminum cold rolling mill. Such rolls have a roll bale 22 with the roll surface 24 and lateral roll necks 26, 28, with which the roll 20 for the rolling operation in corresponding bearings of a

Roll stand can be rotatably mounted. The roll bale 22 has

typically a bale-shaped contour that is slightly tapered to the sides. The roll grinding device 10 comprises a roll holder 30 with two bearings 32, 34, which are arranged for the rotatable mounting of the roller 20. Instead of supporting the roller 20 in the bearings 32, 34, the roller can be stored on bearings designed as setting rods (35 in Fig. 1). Such a setter preferably comprises a hydraulic grinding bearing for supporting a roll neck.

Furthermore, the roller holder 30 has a drive (not shown), which is arranged for the rotational drive of the roller 20 with adjustable roller speed (arrow 36). The roll grinding apparatus 10 furthermore has a grinding tool 40 in which an abrasive body 42 designed as a grinding wheel is rotatably mounted. Furthermore, the grinding tool 40 has a rotary drive (not shown) for driving the grinding wheel 42 with adjustable grinding wheel speed (arrow 44). The employment of the grinding tool 40 to the roller 20 can be adjusted by means of a drive designed for this purpose (arrow 46). The drive may include a coarse and fine adjustment drive. In particular, the pressure with which the grinding body 42 presses on the roller surface 24 can also be adjusted by means of this drive. Furthermore, the grinding tool 40 can be moved parallel to the axial direction of the roll 20 over the entire width of the roll bale 22 by means of a drive (arrow 48) designed for this purpose.

The bearing 34 can be moved on a translation device 50 in the axial direction of the roller 20 (see arrow 52) in order to be able to clamp the roller 20 in the bearings 32, 34 or in order to be able to adapt the spacing of the bearings 32, 34 to different roller lengths ,

During the grinding process, the grinding wheel 42 through the

provided drive with a grinding wheel speed 44 driven and with

Drive 46 moved up to the roller surface 24, so that the grinding wheel 42, the roller surface 24 processed grinding. At the same time, the roller 20 is driven by the drive provided with roller speed 36, so that the grinding wheel 42 can act on the roller surface 24 over the entire peripheral surface. In addition, by the grinding tool 40 is moved with drive 48 over the entire width of the roll bale 22 parallel to the axial direction of the roll 20, the entire roll surface 24 of the roll 20 can be processed by the grinding wheel 42 in this way. The one-time operation of the grinding tool 40 with the rotating roll 20 is referred to as a transition of the grinding tool 40 via the roll surface 24. Typically, a grinding process includes a plurality of such transitions.

The device 10 has a feed line 60 (only in FIGS. 2 and 3)

shown), with the during grinding a grinding emulsion 62 on the Roll surface 24 can be applied to the roller 20 and the

To cool grinding wheels and to improve the grinding process.

The device 10 furthermore has a measuring device 70 (shown only in FIGS. 2 and 3), which is set up to measure measured values of a measured variable related to the surface quality of the roller 20 in a measuring region 72 on the roller surface 24. The measuring device 70 may be, for example, an optical measuring device, for example a measuring device for an optical reflectivity or scattered-light measuring method. With such a method, in particular the roughness of the roll surface can be determined. The

Measuring device 70 may alternatively or additionally also for the determination of

Patterns on the roll surface 24 may be formed. For this purpose, the

Measuring device 70, for example, have an image acquisition system, which receives an image of the roller surface 24 in the measuring range 72, the detected image data of a Fourier transform undergoes and periodically recurring structures on the roller surface 24 based on excessive frequencies in the Fourier spectrum.

The measuring device 70 is set up so that it essentially has a stationary position relative to the grinding tool 40. For this purpose, the

Measuring device 70 to be fixedly coupled to the grinding tool 40, so that the measuring device 70 moves along with movement of the grinding tool 40 parallel to the axial direction of the roller 20. Alternatively, a separate drive 73 may be provided with which the measuring device 70 is moved along with the movement of the grinding tool 40 parallel to the axial direction of the roller 20 accordingly.

Preferably, the measuring device 70 is set up in such a way that the measuring region 72 is arranged behind the grinding region, independently of the grinding direction, so that a surface region processed by the grinding tool 40

Roll surface substantially immediately after grinding in the

Measuring range 72 arrives. For this purpose, the measuring device 70 can be moved be formed to be able to be arranged depending on the grinding direction on one or the other side of the grinding tool 40. Alternatively, the measuring device 70 may also comprise two detection systems, one of which is arranged on one side and the other on the other side of the grinding tool 40.

To improve the measurements by the measuring device 70, the

Roll grinding device further comprises a doctor blade 74 (shown only in Figures 2 and 3), with the guided from the feed line 60 to the roller 20

Abrasive emulsion 62 and possibly also other contaminants from which is moved into the measuring area 72 moving part of the roller surface 24 and this area can be cleaned with it. The with the measuring device 70th

The measurement carried out in this way is not disturbed or at least to a lesser extent by absorption or diffuse scattering due to the grinding emulsion. The squeegee 74 may be arranged parallel to the axial axis of the roll 20 or (as in Fig. 2) also at an angle thereto. Furthermore, the squeegee 74 for

Improvement of the cleaning result be inclined at an angle in the range of 15 ° and 45 ° in the direction of rotation of the roller. The squeegee plane would then be inclined in the direction of rotation by an angle between 15 ° and 45 ° with respect to a plane perpendicular to the roller surface 24, so that a direction of rotation of the roller 20 (arrow 36) pointing toward the squeegee 74 moves due to the direction of rotation of the roller 20 shown in FIG Range of the roll surface 24 to an acute angle of the doctor blade 74 (analogous to a positive rake angle in a chip tool) zuliefe.

The roll grinding device 10 further comprises a control device 80 (shown only in FIG. 2) which is set up to control the roll grinding device 10. In particular, the control device 80 is configured to cause the measurement of at least one measured value with the measuring device 70 during grinding, ie while the roll surface 24 is being processed by the grinding wheel 42. In this way, the surface finish of the roll 20 can be examined during the ongoing grinding process. Furthermore, the control device 80 is adapted to at least one operating parameter of the roll grinding device 10, in particular the

Roller speed 36, the wheel speed 44 and / or the setting of the grinding tool to the roller as a function of the measured quantity measured, i. depending on the corresponding one or more measured during grinding

Readings. In this way, the grinding process can be controlled automatically during operation via the surface quality of the roller 20 determined online, so that overall better or reliably adjustable surface qualities of the roller can be achieved with this method.

The device 10 may further comprise a temperature sensor 90 (shown only in Figure 2), with which the storage temperature of the bearing 32, for example, can be measured. Preferably, the control device 80 is adapted to set the operating parameters of the grinding process as a function of this storage temperature.

FIGS. 4a-b illustrate a reflectivity or scattered light measurement on the roller surface 24 for measuring a measured value of a measured variable relating to the surface roughness of the roller surface, in particular A _q , A _s k and / or A _qm .

FIG. 4 a firstly shows the present example for a reflectivity or

Stray light measurement measuring device formed 70, the light source 76 for irradiating a light beam (left arrow) on the roll surface 24 in

Measuring range 72 and a light sensor 78 for the scatter angle-dependent detection of the reflected or scattered from the roller surface 24 light rays (right arrows). Such a measuring device 70 is particularly suitable for measuring the surface roughness by the laser triangulation method. Alternatively, the light source 76 of the measuring device 70 may also be arranged centrally and irradiate a light beam perpendicular to the roller surface. The light sensor 78 may then be annular around the light source 76, for example

be arranged to the intensity of the scattered by the roller surface 24 light angle-dependent, ie dependent on the scattering angle α between the

Roll surface normal and the direction of the scattered light beam to measure. The measuring device 70 or the light sensor 78 may also be a line detector.

FIG. 4b shows the light intensity 1 (a) detected by such an annularly arranged light sensor 78 as a function of the scattering angle o. The light is diffused by the roll surface the more diffuse the roughness of the

Roll surface 24 is. Therefore, the larger the roughness of the roller surface 24, the larger the variance of the intensity distribution. The above measured variables can now be calculated according to the guideline VDA 2009 "Angle resolved

Stray light measurement "from the angle-dependent intensity distribution 1 (a), for example from the ratio of the maximum intensity to the variance of the

Determine intensity distribution. The measured variable A _q corresponds to this case

for example, the quadratic variance of the intensity distribution 1 (a). The

Measurand A _qm corresponds to a mean value of a defined number of

Individual values for A _q .

FIGS. 5a-b illustrate a method for determining patterns on the roller surface 24. For this purpose, the measuring device 70 may include a

Have image acquisition device, with the images of sections of the

Roll surface 24 can be recorded in a measuring range 72. FIG. 5a exemplarily shows such an image of a section of the roller surface 24, wherein z and x represent the coordinates of the image (lines and columns). The

Image data includes an intensity value I (x, z) for each coordinate (x, z).

As can be seen in FIG. 5 a, the roller surface 24 has a periodically recurring pattern 100. The presence of such a pattern 100 can be automatically determined, for example, by means of a Fourier transformation of the image data of the image from FIG. 5a. 5b shows an exemplary result of an evaluation function F _(x q), which comprises a Fourier transform of the image data from Figure 5a, and is plotted in Figure 5b against the Fourier variable _x q columns of the image. An example of one

Evaluation function F (q) for determining recurrent patterns in the direction of the x-axis of the image from FIG. 5a is given below:

The periodically recurring pattern 100 can be seen in the diagram as a clearly pronounced maximum and can be determined automatically in this way.

Figure 6 shows a diagrammatic representation of an exemplary

A grinding program 110 comprising a plurality of consecutive grinding steps 1 to 10, wherein each of the grinding steps comprises two transitions of the grinding tool 40 across the roller surface 24, as the grinding tool 40 moves from one end of the roll bale to the other end (first transition) and back (second Crossing). The grinding steps 1 to 10 of the grinding program 110 are grouped into two major sections, namely a first section 112 with the grinding steps 1 to 5 for pre-grinding the roller 20 in which the roller geometry is adjusted, and a second section 114 with the grinding steps 6 to 10 for finish grinding of the roll, in which the desired surface finish of the roll is adjusted.

During the individual grinding steps 1 to 10, a measurement of at least one measured quantity relating to the surface quality is preferably carried out continuously. The controller 80 may then be dependent on the determined Measured values set the operating parameters of the current and / or subsequent grinding steps of the grinding program 110.

If during the grinding program 110 in progress, for example in the grinding step 8, an error is detected on the roll surface which can no longer be corrected with the subsequent grinding steps 9 and 10, the control device 80 preferably jumps automatically to an earlier grinding step, for example to Grinding step 3 back to this error in the course of the now following grinding steps 4 to 10 can fix.

FIG. 7 shows a diagram with an exemplary variation of a

Operating parameters of the roll grinding device during grinding. In the diagram, for this purpose, the roller speed W for a transition of the grinding tool 40 over the roller surface 24 against the axial position z of the grinding tool 40 to the roller ball 22 is plotted. As can be seen from the graph, the roll speed W is varied within a corridor between a predetermined upper limit 122 and a predetermined lower limit 124 for the roll speed. The variation of the operating parameter can, as shown in FIG. 7, take place regularly, but also irregularly. It has been found that by such a variation of an operating parameter during a transition of the

Grinding tool 40 on the roll surface 24 patterning on the roll surface can be prevented.

Figure 8 shows a schematic control diagram for a possible control of one or more controlled variables over one or more operating parameters of the roll grinding apparatus 10 of Figure 1 during grinding, i. during the ongoing grinding process.

In the control diagram, the grinding process represents the controlled system. During the grinding process, various disturbance variables act, for example

Temperature fluctuations, irregularities of the roll to be ground 20 or of the grinding wheel 42, external vibrations and other influences on the

Grinding process that can lead to deviations from the desired surface quality, in particular the desired roughness or the desired pattern freedom. With an online control of the roll grinding device 10, such disturbing influences can be compensated so that, as a result, a better grinding result can be achieved.

For this purpose, during grinding, one or more measured variables related to the surface quality of the roll are determined and used as controlled variables for the control. 8, the local roughness deviation AA _q (c, z), the local roughness value in the axial direction A _q (z), the mean roughness value λ _q and the oscillation spectrum of the roll grinding device F _m are indicated as possible controlled variables.

Under the local Rauheitsabweichung AA _q (c, the deviation of the local roughness value is A _q at a rate determined by the position z in an axial direction and through the position c in the circumferential direction of the roller body to an average roughness value Ä zj understood _q. For example, AA _q (c, z) by the formula

AA _q (c, z) = A _q (c, z) - Ä _q where A _q (c, z) is the local roughness value determined by means of scattered light measurement in a measuring range 72 at axial position z and circumferential position c of the roller 20 and Ä _{q is} a mean roughness value calculated by averaging over several measuring ranges.

The local roughness value in the axial direction A _q (z) is understood to mean the roughness value A _{q of} the roll surface as a function of the position z in the axial direction. For example, A _q (z) can be determined by means of scattered light measurement in a measuring region 72 at the axial position z of the roller 20. In particular, A _q (z) can be determined by averaging roughness values A _q in the circumferential direction at substantially the same z position. Below the mean roughness value λ _q is an average of the during the

Grinding process determined roughness values A _q at different points of Roll surface understood. For example, λ _q can be determined by averaging the roughness values A _q measured by means of scattered light measurement in different measuring ranges 72. Such an averaging is preferably selected so that λ _{q represents} an average roughness value of substantially the entire roll surface 24.

The vibration spectrum F _{m of} the roll grinding device is understood to mean the frequency-dependent amplitude of the vibrations of the roll grinding device. For example, if the roll grinding device 10 oscillates at certain frequencies, then the vibration spectrum F _m has a maximum at these frequencies. The oscillation spectrum F _m can be determined in particular by means of an acceleration sensor provided on the roll grinding device 10. For example, the vibration spectrum in a certain

Time interval are calculated by a Fourier transformation of a time series a (t) of the acceleration measured by the acceleration sensor.

Instead of the control variables _AAq (c, z), _Aq (z), _Äq and Fm described _above , it is of course also possible to use alternative controlled variables which represent the pattern freedom, properties of the roughness of the roll 20 or also the state of vibration of the roll grinding apparatus 10 , In particular, controlled variables can be used that are related to or dependent on one or more of the controlled variables AA _q (c, z), A _q (z), λ _q and F _m . For example, instead of the oscillation spectrum F _m , the acceleration a (t) of the roll grinding device 10 or a variable derived from the oscillation spectrum F _m can also be used directly as a controlled variable. For the sake of clarity, the regulation is described below by way of example for the controlled variables AA _q (c, z), A _q (z), A _q and m.

The regulation of the roll grinding device 10 can take place simultaneously with one or more controlled variables. For example, to achieve the

Non-pattern control over the controlled variable AA _q (c, z) or other controlled variable related to the sample freedom. To set a uniform roughness over the roll width can be done in addition to a control of the controlled variable A _q (z) or another on the roughness in the axial direction related control variable. Alternatively or additionally, for setting a

desired target roughness control over the controlled variable Ä _q or another on the average roughness related control variable done. Further alternatively or additionally, for the suppression of unwanted vibrations of

Roll grinding device 10 also carried out a control of the controlled variable F _m or another related to the vibration state of the roll grinding controlled variable.

The values recorded during grinding for the individual controlled variables are fed back and compared with the respective setpoint values for the controlled variables (AA _q ^soll (c, z), A _q ^soll (z), Ä _q ^so11 and F _m ^so11 ), ie a deviation of the respective control variable from the desired value is determined, in particular by ^subtraction such as Ä _q - Ä _q ^so11 . The setpoint values for the individual controlled variables are also referred to as reference variables.

The local roughness deviation is preferably minimized to achieve uniform roughness and, in particular, pattern freedom. Therefore, AA _q ^soll (c, z) is preferably small for all positions c and v, in particular zero. The local

Roughness value in the axial direction is preferably as constant as possible and corresponds to the target roughness. Therefore, A _q ^soll (z) is preferably constant for all positions z and in particular equal to the target roughness. The average roughness should preferably adopt the Zielrauheitswert so that Ä _q ^SO11 preferably the Zielrauheit corresponds. The oscillation spectrum preferably has no strong maxima, which can lead to a pattern formation, so that as F _m ^sol! preferably a constant amplitude or even zero amplitude spectrum is selected.

When grinding the roller 20 based on a predetermined grinding program with several successive grinding steps, the target values of one or more controlled variables can also be adjusted depending on the respective grinding step become. For example, the rough grinding program may first be started with larger target values A _q ^{so, 1} (z) and ^λ _q ^so11 before these target values are reduced until they finally reach the target roughness at the last grinding step. In particular, different setpoint values can be used during pre-grinding than in finish grinding.

From the deviations of the respective control variables from the desired value, the controller illustrated in FIG. 8 then calculates values for one or more operating parameters for each controlled variable used in the control in order to counteract the deviation of the respective controlled variable from the desired value. These operating parameters are therefore the manipulated variables of the control. The operating parameters are then set according to the values calculated by the controller and thus affect the grinding process, thus closing the control loop. For the controlled variable AA _q (c, z) can be used as a manipulated variable in particular the change of

Grinding current AI (c, z) are used as a function of the axial direction z. The grinding current I (c, z) is the current (for example the armature current) of the motor for driving the grinding wheel 42. The grinding current change AI (c, z) can not normally be controlled directly, but must be controlled in turn. A regulation of the grinding current change AI (c, z) can take place in particular via the position a _{u of} the drive for the fine adjustment (so-called u-axis) of the employment of the grinding tool 40 to the roller 20. By _{u u} can be adjusted in particular the pressure with which the abrasive body 42 presses on the roller 20, and thus the applied by the drive of the grinding wheel 42 torque or the grinding current. Alternatively, _{u u} can also be used directly as a manipulated variable for the controlled variable AA _q (c, z).

For the controlled variable A _q (z), the position a _u and / or a _{e of} the drive for the fine adjustment of the adjustment of the grinding tool 40 to the roller 20 can be used as the manipulated variable. For the controlled variable e _q particular one or more of the following may

Manipulated variables are used: the position a _e and / or a _{u of} the drive for the coarse and / or fine adjustment of the setting of the grinding tool 40 to the roller 20, the rotational speed v _{w of} the roller 20, ie the speed of

Roll surface 24 by the rotation of the roller 20, the feed rate Vfa of the roller 20 and the grinding tool 40 in the axial direction or the

Orbital velocity v _{c of} the grinding wheel, ie the speed of the

Abrasive surface by the rotation of the grinding wheel 42. Furthermore, the manipulated variable _Äq also the manipulated variable of the relative speed between the grinding tool 40 and the roller surface 24 may be used. This depends on v _w and Vf _a . Alternatively, the value for v _w in the calculation of the value may be considered for Vfa or vice versa.

The vibration spectrum of the roll grinding device 10 can be influenced in particular by the fact that at least one operating parameter such as

Circulation speed v _{w of} the roller or the roller speed W or

Circulating speed v _c of the grinding wheel or the grinding wheel speed S is varied during a transition of the grinding tool on the roll surface within predetermined limits. An example of such a variation of an operating parameter is shown in FIG. 7 described above. The variation of the rotational speed v _{w of} the roller or the variation of the

Circulation speed v _{c of} the grinding wheel can each by a

Variation _frequency f _vc and f _vw and a variation _amplitude A _vw and A _vc

be characterized. For a purely sinusoidal variation, the

Circulating speed v _{w of} the roller during a transition of the grinding tool over the roller surface, for example, be varied as follows depending on the time t: v _w (t) = A _vw ^■ sin (2n · fvw "tl.

Correspondingly, one or more of the following control variables can be used for the controlled variable F _m : the frequency f _vw and / or the amplitude Avw of the variation of the rotational speed v _{w of} the roller or frequency f _vc and / or the amplitude A _{vc of} the variation of the rotational speed v _c of

Grinding wheel.

The regulation of the roll grinding device 10 can in particular by the

Control device 80 take place. For this purpose, the control device 80 is in particular configured to carry out such a control, in particular in accordance with the previously described embodiments and exemplary embodiments.

Claims

P atentansprü che method for grinding a roller (20), in particular a working, intermediate or support roller, by means of a roll grinding device (10), in particular a roll grinding device according to one of claims 12 to 15, wherein a roller (20) with a Grinding tool (40) of the roll grinding device (10) is ground, during which at least one measured value of at least one of the surface quality of the roller (20) related measured variable is measured and during grinding at least one operating parameter of the roll grinding device (10) as a function the measured variable is set. A method according to claim 1, characterized in that during the grinding at least one measured value of at least one on the surface roughness of the roller (20) and / or at least on a pattern formation on the roller surface (24) related measured variable is measured, in particular with an optical measuring method. A method according to claim 1 or 2, characterized in that one or more of the following operating parameters are controlled as a function of the at least one measured variable: roller speed, wheel speed, direction of rotation of the roller and / or the grinding wheel, axial feed rate, relative position of the grinding tool to the roller, in particular Infeed of the grinding tool, or volume flow of a grinding emulsion used. Method according to one of Claims 1 to 3, characterized in that at least one measured value of a measured variable relating to the vibration state of the roll (20) and / or the roll grinding device (10) is measured during grinding and at least one operating parameter of the roll grinding device (10) Function of this measurand is set. Method according to one of Claims 1 to 4, in which a control pattern for the patterning on the roll surface (24) is controlled via one or more of the following control variables: the power of the drive for an abrasive body (42) of the grinding tool (40 ), the pressure of the grinding wheel (42) on the roller, the relative position of the grinding tool (40) to the roller (20) and / or a dependent of one or more of these control variables operating parameters. Method according to one of claims 1 to 5, in which a control variable for the roughness of the roller (20) is controlled in the axial direction, via one or more of the following control variables: the relative position of the grinding tool (40) to the roller (20) and / or an operating parameter dependent on this manipulated variable. Method according to one of claims 1 to 6, in which a controlled variable for the average roughness of the roller (20) is controlled via one or more of the following control variables: the relative position of the grinding tool (40) to the roller (20) Circulation speed vw of the roller (20), the feed rate Vfa of the roller (20) or of the grinding tool (40) in the axial direction, the rotational speed vc of an abrasive body (42) of the grinding tool (40) and / or one of one or more of these manipulated variables dependent operating parameters. Method according to one of claims 1 to 7, characterized in that the grinding of the roller (20) takes place in several transitions of the grinding tool (40) via the roller surface (24) and that at least one operating parameter of a transition depending on at least one during an earlier Transition measured measured value is set. Method according to one of claims 1 to 8, characterized in that the grinding of the roller (20) based on a predetermined grinding program with several successive grinding steps, each grinding step at least one transition of the grinding tool (40) on the roll surface (24) with associated operating parameters comprises, during grinding, determining a surface characteristic value as a function of the at least one measured quantity related to the surface quality of the roller (20) and, depending on the surface characteristic within the grinding program, jumping to an earlier or later grinding step. 10. The method according to any one of claims 1 to 9, characterized in that the grinding of the roller (20) in several transitions of the grinding tool (40) via the roller surface (24) and that during a transition of at least one of the operating parameters roller speed, wheel speed, Direction of rotation of the roller (20) and / or the grinding body (42), axial feed rate, relative position of the grinding tool (40) to the roller, in particular delivery of the grinding tool (40), or volume flow of a grinding emulsion used is varied within predetermined limits.

1. The method according to claim 10,

in which a controlled variable for the vibration state of Roll grinding device (10) is controlled, via one or more of the following control variables: the frequency and / or the amplitude of a variation of one or more operating parameters and / or one of one or more of these control variables dependent operating parameters.

Roll grinding device (10) for grinding a roll (20), in particular a working, intermediate or support roll, for example for aluminum cold rolling mills,

a roller holder (30) comprising two bearings (32, 34) adapted to rotatably support the roller (20),

with a drive (36), which is set up for the rotational drive of the roller (20) with adjustable roller speed,

with a grinding tool (40) which is adapted to receive and rotationally drive an abrasive body (42) with adjustable grinding wheel speed and to set the grinding body (42) to the roller (20),

characterized,

in that the roll grinding device (10) comprises a measuring device (70) which is set up to measure measured values of a measured quantity related to the surface quality of the roll (20), and

in that the roll grinding device (10) comprises a control device (80) set up to control the device (10), wherein the

Control device (80) is arranged to cause the measurement of at least one measured value with the measuring device (70) during grinding and at least one operating parameters of the roll grinding device (10), in particular the roller speed, the grinding wheel speed, the axial

Feed rate and / or the employment of the grinding tool (40) to the roller (20) to set as a function of the measured variable.

Roll grinding device according to claim 12,

characterized, in that the control device (80) is set up to carry out a method according to one of Claims 1 to 11.

Roll grinding device according to claim 12 or 13,

characterized,

in that the measuring device (70) is designed to have a substantially stationary position relative to the grinding tool (40) during grinding.

Roll grinding device according to one of claims 12 to 14,

characterized,

in that the roll grinding device (10) has a cleaning device (74) which is set up to clean the measuring region (72) detected by the measuring device (70) before carrying out the measurement.