EP3086901B1 - Dispositif de rectification de cylindre et procédé de rectification d'un cylindre - Google Patents

Dispositif de rectification de cylindre et procédé de rectification d'un cylindre Download PDF

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Publication number
EP3086901B1
EP3086901B1 EP14823988.2A EP14823988A EP3086901B1 EP 3086901 B1 EP3086901 B1 EP 3086901B1 EP 14823988 A EP14823988 A EP 14823988A EP 3086901 B1 EP3086901 B1 EP 3086901B1
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EP
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Prior art keywords
roll
grinding
measured
roller
tool
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EP14823988.2A
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German (de)
English (en)
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EP3086901C0 (fr
EP3086901A2 (fr
Inventor
Stephan Draese
Jan Hendrik HOLTZ
Gernot NITZSCHE
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Speira GmbH
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Speira GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
    • B24B5/045—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally with the grinding wheel axis perpendicular to the workpiece axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls

Definitions

  • the invention relates to a method for grinding a roll, in particular a work, intermediate or back-up roll, by means of a roll grinding device. Furthermore, the invention relates to a roll grinding device for grinding a roll.
  • Rolls typically have a roll barrel, which is followed axially by roll necks on both sides.
  • the surface of the roll barrel is referred to herein as the roll surface because it is the surface of the roll that comes into contact with the rolled product (in the case of a work roll) or with the rolling surfaces of other rolls (in the case of an intermediate or backup roll) during rolling .
  • the roll necks are inserted into bearings of the rolling mill provided for this purpose, so that the roll is rotatably mounted.
  • One of the two roll necks typically has a connection contour, for example a flattening, for connection to a roll rotary drive.
  • rolls also have to meet criteria with regard to the roll geometry, ie with regard to the contour of the roll barrel, and with regard to their surface quality, ie the quality of the roll surface.
  • the surface quality of the roll usually includes the simultaneous fulfillment of one or more criteria with regard to surface roughness, surface gloss, freedom from patterns and/or freedom from singular or recurring defects in the micrograph of the roll.
  • the surface quality of rolls is particularly important when rolling rolled products, which are themselves subject to high demands on their surface quality, since surface defects on the roll surface, such as scratches or patterns, can be transferred to the rolled product, so that it either has to be post-treated in a complex way or may even have to be scrapped.
  • rolls of rolling mills in particular the work, intermediate and/or back-up rolls, are regularly ground in roll grinding devices provided for this purpose in order to maintain or restore the roll geometry and the surface quality of the roll.
  • CNC Computerized Numerical Control
  • the achievable roughness of the roll surface depends heavily on the parameters of the grinding tool, in particular a commonly used grinding wheel, the roll material, the cooling lubricant used during grinding and the characteristics of the cylindrical grinding system itself.
  • the grinding methods with CNC control from the prior art can only be successful with regard to the target roughness of the roll surface to be set if the conditions on the roll, on the grinding tool, on the cooling lubrication and on the cylindrical grinding system itself during the be kept constant throughout the grinding process.
  • this can hardly be realized in practice, so that the desired target roughness of the roll surface depends on of the experience of the operators of the grinding plant can only be achieved to a certain extent.
  • Offline and online measuring methods are sometimes used to support the operating personnel in assessing the surface created during the grinding process in order to be able to make manual corrections during the ongoing grinding process.
  • the grinding process is interrupted at certain intervals so that measurements can be carried out on the roll. Depending on the result of the measurements, the operator can then continue the grinding process with the same or with modified parameters.
  • this quality is evaluated visually and/or visually with measuring aids or during the grinding process (online) by the operators of the grinding systems when the grinding process is interrupted or after the end of the grinding process (offline), so that the operating personnel can then take corrective measures manually if necessary or repeat the grinding process.
  • the object of the present invention is to provide a roll grinding device and a method for grinding a roll, with which a high surface quality of the work rolls can be reliably achieved.
  • a method for grinding a roll in particular a work roll, intermediate roll or back-up roll, by means of a roll grinding device, in which a roll is ground with a grinding tool of the roll grinding device, in which at least one measured value is measured during the grinding the measured variable related to the surface quality of the roll is measured, during which at least one operating parameter of the roll grinding device is set as a function of the measured variable during the grinding and in which the roll surface area recorded during the measurement is cleaned before the measurement.
  • the measured variable or a variable derived from the measured variable can be used in particular as a controlled variable of a regulation that is to be adjusted to a predetermined or specifiable desired value.
  • An actual value of the controlled variable can be determined via the measurement, which is compared with the setpoint during control.
  • the at least one operating parameter can be used in the regulation, preferably as a manipulated variable, via which the controlled variable is regulated.
  • the value the manipulated variable or the operating parameter is determined in such a control as a function of the deviation of the controlled variable from the target value and thus as a function of the measured value of the measured variable.
  • the detection of the at least one measurement variable related to the surface quality of the roll can preferably also be used to detect one or more measured variables related to the geometry of the roll.
  • at least one operating parameter of the roll grinding device can preferably be set as a function of the measured variable related to the surface quality of the roll and a measured variable related to the geometry of the roll. In this way, the requirements for the geometry and the surface quality of the roll can be met at the same time.
  • the grinding process is subject to a lesser extent to the influence of a subjective visual surface assessment by the operating personnel and that the grinding characteristics achieved, in particular the surface quality achieved, can be controlled to a lesser extent by the operating personnel, the grinding tool, the machined roll, depends on the auxiliary or operating materials used during grinding and/or on the machine characteristics of the roll grinding device.
  • grinding times can be saved and/or incorrect grinding can be avoided, so that there is an overall cost saving.
  • a roll is ground with a grinding tool of the roll grinding device.
  • a grinding tool preferably has a grinding body, in particular in the form of a grinding wheel, which rotates at an adjustable speed of the grinding body during grinding.
  • a grinding wheel can, for example, consist of a matrix, preferably a synthetic resin matrix such as a Bakelite matrix or a ceramic matrix, with embedded grinding particles, preferably corundum particles, boron nitride particles (CBN) and/or silicon carbide particles (SiC).
  • the roller is preferably driven in rotation about its axial axis, in particular at an adjustable roller speed, so that the roller surface can be machined 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.
  • the grinding tool is preferably moved parallel to the axial axis of the roll across essentially the entire width of the roll barrel, so that the roll surface can be machined with the grinding tool over the entire axial extent of the roll barrel.
  • the roller can also be moved in the axial direction relative to the grinding tool during grinding. The relative speed between the grinding tool and the roller during this movement is called the axial feed speed.
  • At least one measured value of at least one measured variable related to the surface quality of the roll is measured during the grinding.
  • a measured variable related to the surface quality of the roll is understood to mean a measured variable which - in contrast to measured variables related to the roll geometry such as the barrel contour or the roll diameter - is aimed at the condition of the roll surface, namely preferably the surface roughness, the surface gloss, the freedom of pattern and/or the freedom from singular or recurring defects of the roll surface. Measured values for several of these measured variables can preferably also be measured during the grinding, preferably continuously.
  • the at least one measured value is measured during the grinding, ie while the roll surface is being ground with the grinding tool. In this way, the surface quality of the roll can be measured during ongoing grinding operations.
  • the at least one measured value is measured at at least one measuring area on the roll surface.
  • the roll grinding device preferably has a measuring device that is set up to measure a measured value at such a measuring area on the roll surface.
  • the measuring device can be an optical measuring device, such as a camera or another light detector that detects light reflected or scattered by the roll surface in the measuring area and calculates a measured value from it.
  • the position and size of the measuring area depend in particular on the area on the roll surface detected by the measuring device and on the movement of the roll relative to the measuring device, for example due to a rotation of the roll during the measuring process.
  • the measuring area is preferably arranged in the immediate vicinity behind the grinding area, preferably at a maximum distance of 30 cm, preferably a maximum of 20 cm, in particular a maximum of 10 cm.
  • An arrangement behind the grinding area is understood to mean that the measuring area is in a position in which an area of the roll surface arrives after it has been processed in the grinding area. For example, if the grinding tool moves from left to right (right to left) along the axial axis of the roller, the measuring area is preferably arranged to the left (right) of the grinding tool.
  • a plurality of measured values are preferably measured during the grinding, for example at specific intervals or in a continuous manner. In this way, the surface quality can be determined during grinding at different measurement areas on the roll surface and/or as a function of time.
  • the roll grinding device preferably has means for determining the position of the measuring area on the roll surface.
  • the position of the measuring device or the measuring area can be determined in the axial direction (z-coordinate).
  • a second sensor in particular an angle sensor, can be used to determine the angle of rotation of the roller or the position of the measuring area in the circumferential position (c-coordinate).
  • the respective z and c coordinates can then be assigned to a measured value measured in a measurement area, and the measured value and the associated coordinates can be stored in a data matrix, for example. 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.
  • At least one operating parameter of the roll grinding device is set as a function of the measured variable during the grinding. This means that at least one operating parameter is set as a function of the at least one measured value of the measured variable measured during grinding.
  • this setting takes place automatically, ie without human intervention, for example by the operating personnel.
  • operating parameters of the roll grinding device can be regulated as a function of the measured values determined during grinding, so that the operating parameters can be regulated as a function of the surface quality of the roll achieved during grinding.
  • the profile of requirements for the surface quality of the roll can be met better and more independently of the environmental conditions or the experience of the operating personnel.
  • one or more measured values of at least one measured variable related to the roll geometry can also be measured and at least one operating parameter can be set as a function of this measured variable.
  • Such a measured variable can relate, for example, to the barrel contour and/or to the roll diameter.
  • a roll grinding device for grinding a roll, in particular a work, intermediate or back-up roll, for example for aluminum cold rolling mills, with a roll holder comprising two bearings, which are designed to rotatably support the roll, with a drive , which is set up to drive the roller in rotation with an adjustable roller speed, and with a grinding tool which is set up to hold and drive a grinding wheel in rotation with an adjustable grinding wheel speed and to position the grinding wheel in relation to the roller
  • the roller grinding device comprising a measuring device for measuring measured values a measured variable related to the surface quality of the roll is set up and the roll grinding device comprises a control device set up 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 roll speed, the grinding wheel speed and/or the angle of inclination of the grinding tool to the roll, as a function of the measured variable, and wherein the roll
  • the bearings of the roll holder are preferably designed to accommodate the roll necks of a roll.
  • the roller grinding device can, for example, each comprise an electric motor.
  • grinding wheels come into consideration as the grinding body.
  • the setting of the grinding tool or the grinding body relative to the roller is understood as meaning the position and/or orientation of the grinding body relative to the roller, in particular the distance from the axial axis of the roller.
  • the diameter of the roll varies in the axial direction.
  • the distance between the grinding body and the axial axis of the roll is therefore preferably adapted to the position of the grinding tool in the axial direction.
  • the pressure with which the grinding body presses on the roller surface can also be set by adjusting the grinding body to the roller.
  • the roll grinding device includes a measuring device that is set up to measure measured values of a parameter related to the surface quality of the roll.
  • the measuring device is preferably set up to measure the measured values in at least one measuring area on the roll surface.
  • the measuring device is preferably designed in such a way that the distance between the measuring device and the 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 and the comparability of different measurements can be improved.
  • the roll grinding device also includes a control device set up to control the roll grinding device.
  • a control device set up to control the roll grinding device.
  • This can be, for example, a control device with at least one microprocessor and preferably at least one memory connected to the microprocessor.
  • the control device is set up to initiate 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 roll speed, the grinding body speed, the direction of rotation of the roll and/or the grinding body, the axial feed speed and/or the Adjust the position of the grinding tool as a function of the measured variable.
  • the at least one operating parameter depends on the at least one measured value of the measurand measured during the grinding is set.
  • the roll grinding device described allows one or more parameters related to the surface quality to be recorded during the ongoing grinding process and to regulate the operating parameters of the roll grinding device with the measured values of these measured variables, so that active control of operating parameters relevant to the roll surface quality is possible and thus the surface quality of the ground rolls that can be achieved with the roll grinding device can be improved.
  • the roll grinding device described above is preferably used to carry out the method described above.
  • control device is set up to carry out the method described above and/or an embodiment of the method described previously or below.
  • control device can comprise a microprocessor and a memory connected thereto with instructions, the execution of which by the microprocessor causes one of the methods or the respective embodiment of the method to be carried out.
  • At least one measurement is taken during the grinding of at least one of the surface roughness of the roll and/or measured at least in relation to a pattern formation on the roll surface, in particular using an optical measuring method.
  • the following measured variables in particular come into consideration as measured variables related to the surface roughness of the roll: R a , R q , R z , R sk , R dq , R Pc (each according to DIN EN ISO 4287), S a , S q , S z , S sk , S dq , S ds (each according to ISO 25178), A q , A sk , A qm (each according to the guideline VDA 2009 "Angle-resolved scattered light measurement technology").
  • at least one measured value of one or more of the aforementioned measured variables can be measured during the grinding.
  • One or more of the measured variables A q , A sk , A qm which can be determined by an optical measuring method, in particular by a scattered light or reflectivity measuring method, are particularly preferred here. In particular, a continuous measurement of these measured variables is also possible.
  • Typical target values for the surface roughness of rolls can be in the range of 0.01 ⁇ m to 1 ⁇ m for the measured variable R a , for example.
  • the measured variables related to the surface roughness of the roll can be influenced or determined in particular by the axial feed speed, the adjustment of the grinding tool or by the speed ratio between the roll and the grinding body in the grinding area. For example, a reduction in the axial feed rate and/or infeed can lead to less roughness. Therefore, preferably at least one of the operating parameters axial feed rate, adjustment of the grinding tool, roller speed, grinding wheel speed, roller direction of rotation and/or grinding wheel direction of rotation is set as a function of the at least one measured variable related to the surface roughness of the roller, such as A q or A qm .
  • the following measured variables come into consideration as measured variables related to pattern formation on the roll surface: measured variables that result from a Fourier transformation (eg using FFT) of an image recording of the Have the roll surface calculated or the standard deviation of A qm , determined in particular over a limited range in the axial direction. For example, it was found that patterns on the roll surface lead to a greater variation in the A qm value, so that patterns on the roll surface can be recognized, for example, by the fact that the standard deviation of A qm exceeds a predetermined limit value. Furthermore, a measured variable related to the vibration state of the roll and/or the roll grinder can also be used to monitor the formation of patterns on the roll surface. In particular, a deviation of the vibration spectrum from a predefined vibration spectrum range, which corresponds, for example, to the range of normal vibration spectra in normal operation of the roll grinding device, can indicate the risk of pattern formation on the roll surface.
  • measured variables related to pattern formation on the roll surface can indicate the risk of pattern formation on the roll surface.
  • the selection of one or more parameters related to the surface quality, in particular the surface roughness of the roll, for which one or more measured values are to be measured during grinding, is preferably made depending on the material of the roll, the application in the roll stand, i.e. a) from Roll stand type or rolling mill type and/or b) the roll type (e.g. work, intermediate or back-up roll), the production step in which the roll is to be used (e.g. running pass, intermediate pass or finishing pass) and/or specific properties of the roll rolled product to be produced (e.g. thickness, gloss and/or roughness).
  • the roll type e.g. work, intermediate or back-up roll
  • the production step in which the roll is to be used e.g. running pass, intermediate pass or finishing pass
  • specific properties of the roll rolled product to be produced 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 from a light source is radiated onto the roller surface and the light reflected or scattered by the roller surface is detected with a light detector, preferably depending on the angle.
  • 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.
  • 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 during the ongoing grinding process.
  • the following measuring methods or the use of measuring devices set up for these measuring methods for determining the surface roughness of the roll can also be considered: laser triangulation or confocal-chromatic measurements using confocal-chromatic point sensors.
  • the roll grinding device has a measuring device that is set up to measure measured values of a parameter related to the surface roughness and/or at least one pattern formation on the roll surface, in particular an optical measuring device.
  • the measuring device is set up to have an essentially stationary position relative to the grinding tool during grinding.
  • the measurement of measured values of the at least one measured variable related to the surface quality of the roll takes place during the grinding in a substantially fixed spatial position relative to the grinding tool.
  • the measuring device can be movement-coupled to the grinding tool, for example, so that the measuring device moves accordingly when the grinding tool is moved becomes. In this way it can be achieved that the measured values recorded during the grinding are in a fixed relationship to the grinding process.
  • the measuring device can be arranged relative to the grinding tool such that a surface section of the roll surface machined by the grinding body reaches the measuring range of the measuring device after a certain time at a predetermined relative axial speed of the grinding tool to the roll.
  • a surface section of the roll surface machined by the grinding body reaches the measuring range of the measuring device after a certain time at a predetermined relative axial speed of the grinding tool to the roll.
  • the relative spatial position of the measuring device or the measuring position in relation to the grinding tool is preferably adapted to the processing direction in such a way that the measuring area is arranged behind the grinding area in each case.
  • the roll grinding device preferably has an adjustment mechanism which is set up to move the measuring device when the sign of the axial feed rate changes such that the measuring area is also arranged after the sign of the feed rate changes behind the grinding area.
  • the measuring area is arranged behind the grinding area, so that in Measuring range that can be measured shortly before the surface machined by the grinding tool.
  • the measuring device is preferably arranged in the area of the grinding tool, for example on the side, above or below the grinding tool.
  • the measuring device is preferably less than 50 cm, preferably less than 35 cm, in particular less than 20 cm at a distance from the grinding tool.
  • the measurement area on the roll surface that is recorded during the measurement is preferable arranged in the area of the area processed by the grinding tool, preferably at a distance of less than 50 cm, preferably less than 35 cm, in particular less than 20 cm.
  • the determined measured values are closely related spatially and temporally to the area of the roll surface processed by the grinding tool, so that the measured values contain representative and timely information about the surface quality of the roll. This achieves a lower control latency, so that countermeasures can be taken in a shorter time to counteract deviations between the target specifications and the measured values measured.
  • This embodiment is particularly advantageous for work, intermediate or back-up rolls of a rolling mill, since these rolls typically have body lengths of up to 2.50 m and diameters of up to 1300 mm.
  • the processing of the entire roll surface by the grinding tool therefore takes a certain amount of time, which as a latency time for regulating the operating parameters can already be too long. Due to the stationary and/or local arrangement of the measuring device to the grinding tool, significantly shorter latency times can be achieved in the control.
  • the roll grinding device has a cleaning device which is set up to clean the measurement area detected by the measuring device before the measurement is carried out.
  • the roll surface area recorded during the measurement is cleaned before the measurement.
  • a grinding emulsion is typically applied to the roll, covering the roll surface.
  • other contaminants such as, for example, particles of the roll material or the abrasive body that have been abraded during grinding can contaminate the roll surface.
  • the grinding emulsion or other contaminants can complicate or falsify the measurement on the roll surface, especially with optical measurement methods
  • the light radiated onto the roller surface in these processes is absorbed or diffusely scattered by the grinding emulsion or the dirt.
  • the cleaning preferably ensures that the surface has constant optical properties before the measurement, which in particular do not vary from measurement to measurement.
  • the roller surface can be scraped free in the area to be measured, for example using a scraper provided for this purpose.
  • the squeegee can, for example, consist essentially of plastic or rubber, preferably with a hardness in the range from 55 to 90 Shore C (according to DIN EN ISO 868), in order not to damage the roller surface.
  • 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 towards an acute angle of the squeegee as a result of the roller rotation.
  • the aforementioned angle is understood to mean the angle between the normal to the roll surface and the plane of the squeegee at a contact point of the squeegee with the roll surface.
  • a squeegee standing perpendicularly on the roller surface would therefore have an angle of 0°.
  • the grinding emulsion or the contaminants can also be blown off or sucked off, in particular by means of a blow-off or suction tool provided for this purpose.
  • the side edge of the squeegee facing the roller surface can also be chamfered at a corresponding angle.
  • the squeegee can also be aligned perpendicularly to the roll surface.
  • one or more of the following operating parameters are controlled as a function of the at least one measured variable: roller speed, grinding wheel speed, direction of rotation of the roller and/or of the grinding wheel, axial feed speed, adjustment of the grinding tool to the roller or volume flow of a grinding emulsion used.
  • a control variable for the pattern formation on the roll surface is controlled, preferably via one or more of the following control variables: the power of the drive for the grinding wheel, in particular the grinding current I(c,z) or the change in grinding current ⁇ I(c,z), the pressure of a grinding body of the grinding tool on the roller, the relative position of the grinding tool to the roller, preferably the infeed of the grinding tool, in particular the position a u and/ or a e of a drive for the fine adjustment of the adjustment of the grinding tool, and/or an operating parameter dependent on one or more of these manipulated variables. It has been shown that these manipulated variables are well suited to counteracting the formation of a pattern on the roll surface.
  • a controlled variable for the roughness of the roll in the axial direction is controlled, preferably via one or more of the following manipulated variables: the relative position of the grinding tool to the roll, preferably the infeed of the grinding tool, in particular the position a u and/or a e of a drive for the fine adjustment of the adjustment of the grinding tool, and/or an operating parameter dependent on this manipulated variable. It has been shown that these manipulated variables are well suited to bringing about a uniform roughness in the axial direction of the roll. Furthermore, a change in the axial feed rate v fa is also conceivable for setting A q (z).
  • a controlled variable for the average roughness of the roll in particular A q , regulated, preferably via one or more of the following manipulated variables: the position of the grinding tool relative to the roll, preferably the infeed of the grinding tool, in particular the position a e and/or a u of a drive for the coarse adjustment or fine adjustment of the inclination of the grinding tool, the rotational speed v w of the roller, the feed speed v fa of the roller or the grinding tool in the axial direction, the rotational speed v c of a grinding body of the grinding tool and/or an operating parameter dependent on one or more of these manipulated variables. It has been shown that these manipulated variables are well suited to achieving a desired mean target roughness of the roll surface.
  • the corresponding controlled variables for the roughness value A qm can in principle also be used, i.e. ⁇ A qm (c, z), A qm (z), A qm etc. It is possible, particularly with a high measuring frequency of the roughness values A q , perform an averaging over a range of roughness values before using them for control.
  • 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 during the grinding and at least one operating parameter of the roll grinding device is set as a function of this measured variable.
  • the operating parameters of the grinding process e.g. B. the roll speed or the grinding wheel speed
  • natural frequencies of the roll or the roll grinder can be excited, so that it can lead to excessive vibrations of the roll or the roll grinder. This can lead to the formation of patterns on the roll surface during grinding and thus to a deterioration in the surface quality of the roll.
  • the vibrations and thus the risk of pattern formation can be reduced overall.
  • Acceleration sensors in different spatial directions can be used, for example, to determine the vibration state of the roll and/or the roll grinding device or parts thereof.
  • the vibration states of the following components of a roll grinding device can be measured: the vibration state of the spindle bearing, i.e. the shaft on which the grinding body such as a grinding wheel is mounted in the grinding tool, the vibration state of the swivel head, i.e. the part of the grinding tool that can be moved relative to the roll, in on which the grinding body is mounted, the vibration state of the grinding body drive and/or the vibration state of a steady rest, i.e. a component intended for mounting a roll neck of the roll.
  • Acceleration sensors can be arranged in or on the spindle, for example, to determine the vibration state of the spindle bearing.
  • the data from a grinding wheel balancing unit integrated in the grinding tool can also be directly included in the analysis of the vibration status.
  • the roll grinding device has a temperature sensor that is set up to determine a temperature of at least one of the two bearings (bearing 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 bearing temperature.
  • the roll is rotatably mounted in at least one bearing of the roll grinding device, at least one measured value of the bearing temperature is measured during grinding and at least one operating parameter of the roll grinding device is set as a function of the bearing temperature.
  • the bearing can heat up due to friction, even if the roll journals in the bearing of a roll grinding device are typically stored in a lubricant such as a lubricating oil or grease. It turned out that this from the Roll speed-dependent heating lead to thermal expansion of the bearing, the lubricant or the roll, which can have an influence on the position of the roll relative to the grinding tool and thus on the grinding effect of the grinding tool on the roll surface. This can result in an irregular and/or degraded surface finish. By detecting and taking into account the bearing temperature when setting the operating parameters of the roll grinding device, these effects can be compensated for and the surface quality of the roll improved as a result.
  • a lubricant such as a lubricating oil or grease.
  • bearings In addition to classic lubricated bearings, there are also roll grinding devices with so-called minimum quantity cooling lubrication systems (oil mist lubrication) for the roll bearings. In these bearings, too, the temperature is preferably monitored.
  • the bearings can be regulated via the amount of lubricant, the valve timing, the valve opening time and/or the air volume.
  • the roll is ground in several passes of the grinding tool over the roll surface.
  • a transition of the grinding tool over the roll surface is understood to mean a method step in which essentially the entire roll surface is processed by the grinding tool. For example, if the roll rotates during grinding, a region of the roll surface over the entire circumference of the roll can be processed by the grinding tool. If, in addition, the rolling tool is moved in the axial direction relative to the roll over the entire axial extent of the roll barrel, the entire roll surface of the roll can be gradually machined by the grinding tool. With such a typical movement configuration, a transition of the grinding tool over the roll surface is understood to mean the complete axial traversing of the axial extent of the roll barrel.
  • the roll is ground in several passes of the grinding tool over the roll surface.
  • the operating parameters Roll grinding devices or their 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 are set for a first group of transitions in order to primarily meet specifications with regard to the roll geometry, i.e. in particular with regard to the barrel contour and/or the roll diameter (pre-grinding), and operating parameters are set for a second group of transitions to primarily meet specifications regarding surface quality (finish grinding).
  • the roll is ground in several passes of the grinding tool over the roll surface and the total number of passes is adjusted during the grinding as a function of the at least one parameter related to the surface quality of the roll. It has been found that depending on the nature of the grinding tool and the roll, the number of passes required to achieve the desired surface finish of the roll can vary. For example, a first roll may require a greater number of passes to achieve a given surface finish than a second roll.
  • the number of transitions required during the process can be determined dynamically by detecting the surface quality of the roll and adjusted accordingly. This can, for example, avoid superfluous transitions and thus minimize the number of transitions. In this way, the abrasion of the rolls during grinding can be reduced, so that the service life of the rolls, in particular the number of possible grinding processes on the roll, is increased.
  • the roll is ground using a predetermined grinding program with several successive grinding steps, each grinding step involving at least one transition of the grinding tool over the roll surface with associated operating parameters includes, during grinding, a surface parameter is determined as a function of the at least one measurement variable related to the surface quality of the roll and, depending on the surface parameter, the grinding program jumps to an earlier or later grinding step.
  • the surface parameter can be a value that is calculated from one or more measured variables related to the surface quality of the roll.
  • the roll is ground as a function of the change in a measured or controlled variable related to the surface roughness of the roll in the previous grinding step or steps.
  • the roughness development before the current grinding step can also be taken into account.
  • the smoothing behavior of the roll surface can vary depending on the roll property.
  • a grinding program typically includes different grinding steps such as pre-grinding and finish-grinding.
  • the pre-grinding or finish-grinding can each also comprise a plurality of grinding steps.
  • the operating parameters are preferably set as a function of the respective grinding step or of the respective transition in such a way that certain properties of the roll are achieved with the grinding step, such as a specific roll geometry during the pre-grinding and a specific Surface finish during finish grinding.
  • the grinding process can be controlled with regard to the surface quality requirements, preferably taking into account the influences of the roll grinding device, in particular the grinding tool, the roll and/or the auxiliary materials and lubricants used in the grinding process. In particular, it is possible to control the method more independently or independently of operator-specific influences.
  • the grinding step to return to is preferably selected depending on the kind of a pattern recognized on the roll surface.
  • a feed pattern for example, a jump can be made to a first grinding step of finish grinding.
  • a feed pattern is understood to be a spiral pattern on the roll surface, which is caused by the spiral trajectory of the grinding body on the roll surface during the axial feed of the grinding tool or the roll.
  • the roll is ground in several passes of the grinding tool over the roll surface and at least one operating parameter of a pass is adjusted as a function of at least one measured value measured during an earlier pass. For example, taking a measurement during a transition can determine how far the surface finish achieved in that transition is from the target surface finish. In this way, one or more subsequent transitions can then be controlled accordingly. This allows subsequent transitions to be dynamically adjusted to reflect the actual surface finish deviation from target.
  • the grinding of the roll takes place in several passes of the grinding tool over the roll surface and during a pass at least one operating parameter, preferably one of the Operating parameters roller speed, grinding wheel speed, direction of rotation of the roller and/or the grinding wheel, axial feed speed, adjustment of the grinding tool to the roller and/or volume flow of a grinding emulsion used, varies within specified limits.
  • the predefined limits for the variation of the at least one operating parameter are preferably set as a function of the transition. For example, limits that are further apart can be used during rough grinding than during finish grinding.
  • the at least one operating parameter can be varied regularly, for example sinusoidally, or also irregularly.
  • the at least one operating parameter is varied in a continuously differentiable manner.
  • the amplitude and/or frequencies of the variations and/or their form and/or frequency preferably determined as a function of the measured values of the measured variable related to the surface quality.
  • a controlled variable for the vibration state of the 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 in one or more operating parameters, in particular the frequency f vw and/or the amplitude A vw of a variation in the peripheral speed v w of the roller and/or the frequency f vc and/or the amplitude A vc of a variation in the peripheral speed v c of a grinding wheel of the grinding tool, and/or one of one or more Operating parameters dependent on these manipulated variables. It has been shown that these manipulated variables are well suited to regulating the state of vibration of the roll grinding device in such a way that undesirable vibrations can be suppressed.
  • the variation of the at least one operating parameter can also be set independently of measured values. Accordingly, the above-described object is also at least partially achieved according to the invention by a method for grinding a roll, in particular a working, intermediate or back-up roll, by means of a roll grinding device, in which a roll is ground with a grinding tool of the roll grinding device, in which the grinding of the Roller takes place in several transitions of the grinding tool over the roller surface and during a transition at least one operating parameter, preferably one of the operating parameters roller speed, grinding wheel speed, direction of rotation of the roller and/or the grinding wheel, axial feed speed, adjustment of the grinding tool to the roller and/or volume flow of a grinding emulsion used, is varied within specified limits.
  • a roll grinding device for grinding a roll, in particular a working, intermediate or back-up roll, for example for Aluminum cold rolling mills, with a roll holder comprising two bearings, which are set up for the rotatable mounting of the roll, with a drive, which is set up for rotating the roll at an adjustable roll speed, and with a grinding tool, which is designed to hold and rotate a grinding wheel with an adjustable grinding wheel speed and is set up to position the grinding body in relation to the roller, the roller grinding device comprising a control device set up to control the device, the control device being set up to determine at least one operating parameter, preferably one of the operating parameters roller speed, grinding wheel speed, direction of rotation of the roller and/or the grinding wheel, axial Feed speed, adjustment of the grinding tool to the roller and / or volume flow of a grinding emulsion used to vary within specified limits.
  • the variation of the at least one operating parameter is in particular independent of a regulation of the grinding process using a controlled variable.
  • the roll grinding device can also have a plurality of measuring devices or measuring systems, with which measured variables related to the surface quality of the roll, in particular with regard to the roughness and/or freedom of pattern, and/or measured variables related to the roll geometry (roll shape).
  • a first measuring device for measuring a parameter for the roughness a second measuring device for measuring a parameter for patterns on the roll surface
  • a third measuring device for example a mechanical probe, for measuring a parameter for the roll geometry
  • a mechanical probe can also be used to detect vibration-related waviness on the roll surface.
  • FIGs 1 to 3 show a roll grinding device 10 for grinding a roll 20.
  • figure 1 shows a perspective view
  • figure 2 a schematic representation in plan
  • figure 3 a schematic representation in side sectional view according to in figure 2 marked cutting plane III. While the depictions in the figures 2 and 3 for the sake of clarity, is limited to certain components, sometimes in a simplified representation figure 1 a more detailed representation of the roll grinding device 10.
  • the roll 20 can be, for example, a work, intermediate or back-up roll of an aluminum cold rolling mill. Such rolls have a roll body 22 with the roll surface 24 and lateral roll necks 26, 28, with which the roll 20 can be rotatably mounted in corresponding bearings of a roll stand for the rolling operation.
  • the roll barrel 22 typically has a barrel-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 set up for the rotatable mounting of the roll 20. Instead of mounting the roll 20 in the bearings 32, 34, the roll can be mounted on steady rests (35 in 1 ) trained camps are stored. Such a steady rest preferably comprises a hydraulic grinding bearing for supporting a roll neck. Furthermore, the roller holder 30 has a drive (not shown), which is set up to drive the roller 20 in rotation at an adjustable roller speed (arrow 36).
  • the roll grinding device 10 also has a grinding tool 40 in which a grinding body 42 designed as a grinding wheel is rotatably mounted. Furthermore, the grinding tool 40 also has a rotary drive (not shown) for driving the grinding body 42 with an adjustable grinding body speed (arrow 44).
  • the position of the grinding tool 40 relative to the roller 20 can be adjusted by means of a drive (arrow 46) designed for this purpose.
  • the drive can include a drive for coarse adjustment and for fine adjustment.
  • the pressure with which the grinding body 42 presses on the roller surface 24 can also be adjusted via this drive.
  • the grinding tool 40 can be moved parallel to the axial direction of the roll 20 over the entire width of the roll barrel 22 by means of a drive designed for this purpose (arrow 48).
  • 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 to be able to adjust the distance between the bearings 32, 34 to different roller lengths .
  • the grinding body 42 is driven by the drive provided for this purpose at a grinding body speed 44 and is moved up to the roller surface 24 with the drive 46 so that the grinding body 42 grinds the roller surface 24 .
  • the roller 20 is driven at roller speed 36 by the drive provided for this purpose, so that the abrasive body 42 can act on the roller surface 24 over the entire circumferential surface. Since the grinding tool 40 is also moved with the drive 48 across the entire width of the roll body 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 body 42 in this way.
  • the one-time traverse of the abrasive tool 40 as the roll 20 rotates is referred to as one pass of the abrasive tool 40 across the roll surface 24 .
  • a grinding process typically includes a plurality of such transitions.
  • the device 10 has a lead 60 (only in Figs figures 2 and 3 shown) with the during grinding a grinding emulsion 62 on the Roller surface 24 can be applied to cool the roller 20 or the abrasive body and improve the grinding process.
  • the device 10 also has a measuring device 70 (only in FIGS figures 2 and 3 shown), which is set up for measuring measured values of a measured variable related to the surface quality of the roll 20 in a measuring area 72 on the roll surface 24 .
  • the measuring device 70 can be, for example, an optical measuring device, for example a measuring device for an optical reflectivity or scattered light measuring method. In particular, the roughness of the roll surface can be determined with such a method. Alternatively or additionally, the measuring device 70 can also be designed to determine patterns on the roll surface 24 .
  • the measuring device 70 can have, for example, an image acquisition system that records an image of the roll surface 24 in the measurement area 72, subjects the acquired image data to a Fourier transformation, and determines periodically recurring structures on the roll surface 24 using excessive frequencies in the Fourier spectrum.
  • the measuring device 70 is set up in such a way that it essentially has a stationary position in relation to the grinding tool 40 .
  • the measuring device 70 can be rigidly coupled to the grinding tool 40 so that the measuring device 70 moves parallel to the axial direction of the roller 20 when the grinding tool 40 is moved.
  • a separate drive 73 can also be provided, with which the measuring device 70 is correspondingly moved along with the movement of the grinding tool 40 parallel to the axial direction of the roller 20 .
  • Measuring device 70 is preferably set up in such a way that measuring area 72 is arranged behind the grinding area, regardless of the grinding direction, so that a surface area of the roll surface machined by grinding tool 40 enters measuring area 72 essentially immediately after grinding.
  • the measuring device 70 can be moved be formed in order to be able to be arranged on one side or the other of the grinding tool 40 depending on the grinding direction.
  • the measuring device 70 can also have two detection systems, one of which is arranged on one side and the other on the other side of the grinding tool 40 .
  • the roll grinding device also has a squeegee 74 (only in Figs figures 2 and 3 shown) with which the grinding emulsion 62 fed from the supply line 60 to the roller 20 and possibly also other impurities can be scraped off from the part of the roller surface 24 moving into the measuring area 72 and this area can thus be cleaned.
  • the doctor blade 74 can be parallel to the axial axis of the roller 20 or (as in 2 ) can also be arranged at an angle to it.
  • the squeegee 74 can be inclined at an angle in the range of 15° and 45° in the direction of rotation of the roller.
  • the plane of the squeegee would then be inclined by an angle of between 15° and 45° in relation to a plane perpendicular to the roller surface 24 in the direction of rotation, so that due to the in 3 indicated direction of rotation of the roller 20 (arrow 36) towards the squeegee 74 area of the roller surface 24 moving towards an acute angle of the squeegee 74 (analogous to a positive rake angle in a cutting tool).
  • the roll grinding device 10 also has a control device 80 (only in figure 2 shown) which is set up to control the roll grinding device 10 .
  • the control device 80 is set up to initiate the measurement of at least one measured value with the measuring device 70 during the grinding, ie while the roller surface 24 is being processed by the grinding body 42 . In this way, the surface quality of the roll 20 can be examined during the ongoing grinding process.
  • control device 80 is set up to determine at least one operating parameter of the roll grinding device 10, in particular the roll speed 36, the grinding body speed 44 and/or the position of the grinding tool in relation to the roll as a function of the measured variable, i.e. dependent on the corresponding one or more measured during grinding measured values.
  • the grinding process can be automatically regulated 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 can further include a temperature sensor 90 (only in figure 2 shown) have, with which the bearing temperature, for example, the bearing 32 can be measured.
  • the control device 80 is preferably set up to also set the operating parameters of the grinding process as a function of this storage temperature.
  • the Figures 4a-b illustrate a reflectivity or scattered light measurement on the roll surface 24 for measuring a measured value of a measured variable relating to the surface roughness of the roll surface, in particular A q , A sk and/or A qm .
  • Figure 4a First shows the measuring device 70, which is designed here as an example for a reflectivity or scattered light measurement, which has a light source 76 for radiating a light beam (left arrow) onto the roller surface 24 in the measuring area 72 and a light sensor 78 for the scattering angle-dependent detection of the light reflected or reflected from the roller surface 24. scattered light rays (right arrows).
  • a measuring device 70 is particularly suitable for measuring the surface roughness using the laser triangulation method.
  • the light source 76 of the measuring device 70 can also be arranged centrally and radiate a light beam perpendicularly onto the roll surface.
  • the light sensor 78 can then be arranged, for example, in a ring around the light source 76 in order to measure the intensity of the light scattered by the roller surface 24 angle-dependent, ie dependent on the scattering angle ⁇ between the roller surface normal and the direction of the scattered light beam to measure.
  • the measuring device 70 or the light sensor 78 can also be a line detector.
  • Figure 4b shows the light intensity I( ⁇ ) detected by such a ring-shaped light sensor 78 as a function of the scattering angle ⁇ .
  • the measurement variables mentioned above can now be determined from the angle-dependent intensity distribution I( ⁇ ), for example from the ratio of the maximum intensity to the variance of the intensity distribution, in accordance with the VDA 2009 guideline "Angle-resolved scattered light measurement technology".
  • the measured variable A q corresponds, for example, to the squared variance of the intensity distribution I( ⁇ ).
  • the measured variable A qm corresponds to an average value from a defined number of individual values for A q .
  • the Figures 5a-b illustrate a method for determining patterns on the roll surface 24.
  • the measuring device 70 can have an image acquisition device with which images of sections of the roll surface 24 can be recorded in a measuring area 72.
  • Figure 5a shows an example of such an image of a section of the roller surface 24, where z and x represent the coordinates of the image (rows and columns).
  • the image data includes an intensity value I(x,z) for each coordinate (x,z).
  • the roller surface 24 has a periodically recurring pattern 100 .
  • the presence of such a pattern 100 can be detected, for example, by means of a Fourier transformation of the image data of the image Figure 5a be determined automatically.
  • Figure 5b shows an exemplary result of an evaluation function F(q x ) that performs a Fourier transformation of the image data
  • Figure 5a includes and in Figure 5b is plotted against the Fourier variable q x of the columns of the image.
  • 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 grinding program 110 with a plurality of successive grinding steps 1 to 10, each of the grinding steps comprising two transitions of the grinding tool 40 over the roll surface 24, namely when the grinding tool 40 moves from one end of the roll barrel to the other end (first transition) and back (second transition).
  • the grinding steps 1 to 10 of the grinding program 110 are grouped into two larger sections, namely a first section 112 with the grinding steps 1 to 5 for pre-grinding the roll 20, in which the roll geometry is adjusted, and a second section 114 with the grinding steps 6 to 10 for finish grinding the roll, in which the desired surface quality of the roll is set.
  • At least one measurement variable related to the surface quality is preferably measured continuously.
  • the control device 80 can then, depending on the determined Set the operating parameters of the current and/or subsequent grinding steps of the grinding program 110 using measured values.
  • control device 80 preferably jumps automatically to an earlier grinding step, for example to Grinding step 3 back in order to be able to rectify this error in the course of the now following grinding steps 4 to 10.
  • FIG. 12 shows a diagram with an exemplary variation of an operating parameter of the roll grinder during grinding.
  • the roll speed W for a transition of the grinding tool 40 over the roll surface 24 is plotted against the axial position z of the grinding tool 40 to the roll barrel 22 .
  • the roller speed W is varied within a corridor between a predetermined upper limit 122 and a predetermined lower limit 124 for the roller speed.
  • the variation of the operating parameter can, as in figure 7 shown, 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 over the roll surface 24, a pattern formation on the roll surface can be prevented.
  • FIG. 12 shows a schematic control diagram for a possible control of one or more control variables via one or more operating parameters of the roll grinding device 10 figure 1 during grinding, ie during the ongoing grinding process.
  • the grinding process represents the controlled system in the control diagram of the grinding wheel 42, external vibrations and other influences on the grinding process, which can lead to deviations from the desired surface quality, in particular the desired roughness or the desired freedom of pattern.
  • offline regulation of the roll grinding device 10 such disruptive influences can be compensated for, with the result that a better grinding result can be achieved.
  • one or more measured variables related to the surface quality of the roll are determined during the grinding and used as controlled variables for the regulation.
  • Possible controlled variables are the local roughness deviation ⁇ A q (c,z), the local roughness value in the axial direction A q (z), the mean roughness value A q and the vibration spectrum of the roll grinder F m are given.
  • ⁇ A q (c,z) the deviation of the local roughness value A q at a point determined by the position z in the axial direction and by the position c in the circumferential direction of the roll becomes an average roughness value A q understood.
  • the local roughness value in the axial direction A q (z) means the roughness value A q of the roll surface as a function of the position z in the axial direction.
  • a q (z) can be determined by measuring scattered light in a measuring area 72 at the axial position z of the roller 20 .
  • a q (z) can be determined by averaging circumferential roughness values A q at substantially the same z-position.
  • a q becomes an average of the roughness values A q determined during the grinding process at various points on the understood roller surface.
  • a q can be determined by averaging the roughness values A q measured in different measuring areas 72 by means of scattered light measurement.
  • an averaging is chosen such that A 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. If the roll grinding device 10 oscillates, for example, at certain frequencies, then the oscillation spectrum F m has a maximum at each of these frequencies.
  • the vibration spectrum F m can be determined in particular by means of an acceleration sensor provided on the roll grinding device 10 .
  • the vibration spectrum can be calculated in a certain time interval by a Fourier transformation of a time series a(t) of the acceleration measured by the acceleration sensor.
  • controlled variables ⁇ A q (c,z), A q (z), A q and F m can of course also be used as alternative control variables, which represent the freedom of pattern, properties of the roughness of the roll 20 or also the vibration state of the roll grinding device 10 .
  • controlled variables can be used that are associated with one or more of the controlled variables ⁇ A q (c,z), A q (z), A q and F m are related or dependent on them.
  • the vibration spectrum F m instead of the vibration spectrum F m , the acceleration a(t) of the roll grinding device 10 or a variable derived from the vibration spectrum F m can also be used directly as the controlled variable.
  • the control is shown below as an example for the controlled variables ⁇ A q (c,z), A q (z), A q and F m described.
  • the control of the roll grinding device 10 can take place simultaneously with one or more controlled variables.
  • regulation can take place via the controlled variable ⁇ A q (c,z) or via another controlled variable related to the freedom from the pattern.
  • To set a Uniform roughness over the roll width can also be controlled via the controlled variable A q (z) or via another controlled variable related to the roughness in the axial direction.
  • regulation via the controlled variable can be used to set a desired target roughness A q or via another controlled variable related to the average roughness.
  • regulation can also be carried out via the controlled variable F m or via another controlled variable related to the vibration state of the roll grinding device.
  • the values recorded during the grinding for the individual controlled variables are fed back and compared with the respective target values for the controlled variables ( ⁇ A q target (c, z), A q target (z), A q target and F m target ) are compared, ie a deviation of the respective controlled variable from the target value is determined, in particular by forming the difference, for example A q - A q should .
  • the target values for the individual controlled variables are also referred to as reference variables.
  • the local roughness deviation is preferably minimized in order to achieve uniform roughness and in particular freedom from pattern. Therefore, ⁇ A q set (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 target (z) is preferably constant for all positions z and in particular equal to the target roughness.
  • the mean roughness value should preferably match the target roughness value, so that A q should preferably correspond to the target roughness.
  • the oscillation spectrum preferably does not have any strong maxima that can lead to the formation of a pattern, so that a spectrum with a constant amplitude or even with an amplitude of zero is preferably selected as F m target .
  • the target values of one or more controlled variables can also be adjusted as a function of the respective grinding step become.
  • the grinding program for pre-grinding can initially be started with larger setpoint values A q set (z) and A q should be started before these target values are reduced until they have finally reached the target roughness in the last grinding step.
  • different target values can be used for rough grinding than for finish grinding.
  • the in figure 8 The controller shown then has 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 target value. Said operating parameters are accordingly the manipulated variables of the regulation. The operating parameters are then set according to the values calculated by the controller and thus act on the grinding process, which closes the control loop.
  • the change in the grinding current ⁇ I(c,z) as a function of the axial direction z can be used as the manipulated variable for the controlled variable ⁇ A q (c,z).
  • the sliding current I(c,z) is understood to mean the current (for example the armature current) of the motor for driving the sliding body 42 .
  • the loop current change ⁇ I(c,z) cannot be controlled directly, but must be regulated in turn.
  • the change in grinding current ⁇ I(c,z) can be regulated in particular via the position a u of the drive for fine adjustment (so-called u-axis) of the positioning of the grinding tool 40 on the roller 20 .
  • the pressure with which the grinding body 42 presses on the roller 20 and thus the torque or the grinding current to be applied by the drive of the grinding body 42 can be adjusted by a u .
  • a u can also be used directly as the manipulated variable for the controlled variable ⁇ A q (c,z).
  • the position a u and/or a e of the drive in particular can be used as the manipulated variable for fine adjustment of the adjustment of the grinding tool 40 to the roller 20 .
  • the controlled variable A q one or more of the following manipulated variables can be used in particular: the position a e and/or a u of the drive for the coarse and/or fine adjustment of the adjustment of the grinding tool 40 to the roller 20, the rotational speed v w of the roller 20, ie the speed of the roller surface 24 due to the rotation of the roller 20, the feed speed v fa of the roller 20 or the grinding tool 40 in the axial direction or the peripheral speed v c of the grinding wheel, i.e. the speed of the grinding wheel surface due to the rotation of the grinding wheel 42.
  • the manipulated variable of the relative speed between the grinding tool 40 and the roll surface 24 can also be used. This depends on v w and v fa .
  • the value for v w can also be taken into account when calculating the value for v fa 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 the rotational speed v w of the roll or the roll speed W or the rotational speed v c of the grinding wheel or the grinding wheel speed S is within predetermined limits during a transition of the grinding tool over the roll surface is varied.
  • An example of such a variation of an operating parameter is in the above described figure 7 shown.
  • the variation in the peripheral speed v w of the roller or the variation in the peripheral speed v c of the grinding body can be characterized by a variation frequency f vc or f vw and a variation amplitude A vw or A vc .
  • one or more of the following manipulated variables can be used for the controlled variable: the frequency f vw and/or the amplitude A vw of the variation in the rotational speed v w of the roller or frequency f vc and/or the amplitude A vc of the variation in the peripheral speed v c of the grinding wheel.
  • the regulation of the roll grinding device 10 can be carried out in particular by the control device 80 .
  • the control device 80 is set up in particular to carry out such a regulation, in particular in accordance with the embodiments and exemplary embodiments described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (15)

  1. Procédé de rectification d'un cylindre (20), en particulier d'un cylindre de travail, d'un cylindre intermédiaire ou d'un cylindre d'appui, au moyen d'un dispositif de rectification de cylindre (10), en particulier d'un dispositif de rectification de cylindre selon l'une des revendications 12 à 15,
    - dans lequel un cylindre (20) est rectifié avec un outil de rectification (40) du dispositif de rectification de cylindre (10),
    - dans lequel, pendant la rectification, c'est-à-dire pendant que la surface du cylindre est rectifiée avec l'outil de rectification, au moins une valeur de mesure d'au moins une grandeur de mesure se rapportant à la qualité de surface du cylindre (20) est mesurée, l'au moins une valeur de mesure étant mesurée au niveau d'au moins une zone de mesure sur la surface du cylindre,
    - dans lequel, pendant la rectification, au moins un paramètre de fonctionnement du dispositif de rectification de cylindre (10) est configuré automatiquement en fonction de la grandeur de mesure, et
    - dans lequel la zone de surface du cylindre détectée lors de la mesure est nettoyée avant la mesure.
  2. Procédé selon la revendication 1,
    caractérisé
    en ce que, pendant la rectification, au moins une valeur de mesure d'au moins une grandeur de mesure se rapportant à la rugosité de surface du cylindre (20) et/ou au moins à une formation de motif sur la surface du cylindre (24) est mesurée, en particulier avec un procédé de mesure optique.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé
    en ce qu'un ou plusieurs des paramètres de fonctionnement suivants sont commandés en fonction de l'au moins une grandeur de mesure : vitesse de rotation du cylindre, vitesse de rotation de meule de rectification, sens de rotation du cylindre et/ou de la meule de rectification, vitesse d'avance axiale, position relative de l'outil de rectification par rapport au cylindre, en particulier avance de l'outil de rectification, ou débit d'une émulsion de rectification utilisée.
  4. Procédé selon l'une des revendications 1 à 3,
    caractérisé
    en ce que, pendant la rectification, au moins une valeur de mesure d'une grandeur de mesure relative à l'état vibratoire du cylindre (20) et/ou du dispositif de rectification de cylindre (10) est mesurée et au moins un paramètre de fonctionnement du dispositif de rectification de cylindre (10) est configuré en fonction de cette grandeur de mesure.
  5. Procédé selon l'une des revendications 1 à 4,
    dans lequel une grandeur de réglage pour la formation de motifs sur la surface du cylindre (24) est réglée, et ce par l'intermédiaire d'une ou de plusieurs des grandeurs de correction suivantes : la puissance de l'entraînement pour une meule de rectification (42) de l'outil de rectification (40), la pression de la meule de rectification (42) sur le cylindre, la position relative de l'outil de rectification (40) par rapport au cylindre (20) et/ou un paramètre de fonctionnement dépendant d'une ou de plusieurs de ces grandeurs de correction.
  6. Procédé selon l'une des revendications 1 à 5,
    dans lequel une grandeur de réglage pour la rugosité du cylindre (20) est réglée dans la direction axiale, et ce par l'intermédiaire d'une ou de plusieurs des grandeurs de correction suivantes : la position relative de l'outil de rectification (40) par rapport au cylindre (20) et/ou un paramètre de fonctionnement dépendant de cette grandeur de correction.
  7. Procédé selon l'une des revendications 1 à 6,
    dans lequel une grandeur de réglage pour la rugosité moyenne du cylindre (20) est réglée, et ce par l'intermédiaire d'une ou de plusieurs des grandeurs de correction suivantes : la position relative de l'outil de rectification (40) par rapport au cylindre (20), la vitesse de rotation vw du cylindre (20), la vitesse d'avance vfa du cylindre (20) ou de l'outil de rectification (40) dans la direction axiale, la vitesse de rotation vc d'une meule de rectification (42) de l'outil de rectification (40) et/ou un paramètre de fonctionnement dépendant d'une ou de plusieurs de ces grandeurs de correction.
  8. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé
    en ce que la rectification du cylindre (20) est effectuée en plusieurs passages de l'outil de rectification (40) sur la surface du cylindre (24) et en ce qu'au moins un paramètre de fonctionnement d'un passage est configuré en fonction d'au moins une valeur de mesure mesurée pendant un passage précédent.
  9. Procédé selon l'une quelconque des revendications 1 à 8,
    caractérisé
    en ce que la rectification du cylindre (20) est effectuée à l'aide d'un programme de rectification prédéfini avec plusieurs étapes de rectification successives, chaque étape de rectification comprenant au moins un passage de l'outil de rectification (40) sur la surface du cylindre (24) avec des paramètres de fonctionnement associés, en ce que, pendant la rectification, une valeur caractéristique de surface est déterminée en fonction d'au moins une grandeur de mesure se rapportant à la qualité de la surface du cylindre (20) et en ce que, en fonction de la valeur caractéristique de la surface, un saut vers une étape de rectification antérieure ou ultérieure est effectué au sein du programme de rectification.
  10. Procédé selon l'une des revendications 1 à 9,
    caractérisé
    en ce que la rectification du cylindre (20) est effectuée en plusieurs passages de l'outil de rectification (40) sur la surface du cylindre (24) et en ce que, pendant un passage, au moins l'un des paramètres de fonctionnement vitesse de rotation du cylindre, vitesse de rotation de la meule de rectification, sens de rotation du cylindre (20) et/ou de la meule de rectification(42), vitesse d'avance axiale, position relative de l'outil de rectification (40) par rapport au cylindre, en particulier avance de l'outil de rectification (40), ou débit volumique d'une émulsion de rectification utilisée, est varié dans des limites prédéfinies.
  11. Procédé selon la revendication 10,
    dans lequel une grandeur de réglage pour l'état vibratoire du dispositif de rectification de cylindre (10) est réglée, et ce par l'intermédiaire d'une ou plusieurs des grandeurs de correction suivantes : la fréquence et/ou l'amplitude d'une variation d'un ou de plusieurs paramètres de fonctionnement et/ou un paramètre de fonctionnement dépendant d'une ou de plusieurs de ces grandeurs de correction.
  12. Dispositif de rectification d'un cylindre (20), en particulier d'un cylindre de travail, d'un cylindre intermédiaire ou d'un cylindre d'appui, par exemple pour des laminoirs à froid d'aluminium,
    - avec un support de cylindre (30) comprenant deux paliers (32, 34) qui sont configurés pour supporter le cylindre (20) de manière rotative,
    - avec un entraînement (36) qui est configuré pour entraîner en rotation le cylindre (20) avec une vitesse de rotation de cylindre configurable,
    - avec un outil de rectification (40), qui est configuré pour recevoir et entraîner en rotation une meule de rectification (42) avec une vitesse configurable de rotation de la meule de rectification ainsi que pour positionner de la meule de rectification (42) par rapport au cylindre (20),
    - le dispositif de rectification de cylindre (10) comprenant un dispositif de mesure (70) qui est configuré pour mesurer des valeurs de mesure d'une grandeur de mesure se rapportant à la qualité de surface du cylindre (20),
    caractérisé
    - en ce que le dispositif de rectification de cylindre (10) comprend un dispositif de commande (80) agencé pour commander le dispositif (10), le dispositif de commande (80) étant agencé pour, pendant la rectification, c'est-à-dire pendant que la surface du cylindre est rectifiée avec l'outil de rectification, provoquer la mesure d'au moins une valeur de mesure avec le dispositif de mesure (70), l'au moins une valeur de mesure étant mesurée au niveau d'au moins une zone de mesure sur la surface du cylindre, et configurer automatiquement au moins un paramètre de fonctionnement du dispositif de rectification de cylindre (10), en particulier la vitesse de rotation du cylindre, la vitesse de rotation de la meule de rectification, la vitesse d'avance axiale et/ou le positionnement de l'outil de rectification (40) par rapport au cylindre (20), comme fonction de la valeur de mesure et
    - en ce que le dispositif de rectification de cylindre (10) comporte un dispositif de nettoyage (74) qui est configuré pour nettoyer la zone de mesure (72) détectée par le dispositif de mesure (70) avant d'effectuer la mesure.
  13. Dispositif de rectification de cylindre selon la revendication 12,
    caractérisé
    en ce que le dispositif de commande (80) est configuré pour mettre en oeuvre un procédé selon l'une des revendications 1 à 11.
  14. Dispositif de rectification de cylindre selon la revendication 12 ou 13, caractérisé
    en ce que le dispositif de mesure (70) est configure pour avoir, pendant la rectification, respectivement une position sensiblement fixe par rapport à l'outil de rectification (40).
  15. Dispositif de rectification de cylindre selon l'une des revendications 12 à 14, caractérisé
    en ce que le dispositif de rectification de cylindre (10) comporte un dispositif de nettoyage (74) sous la forme d'une raclette, qui est configuré pour nettoyer la zone de mesure (72) détectée par le dispositif de mesure (70) avant d'effectuer la mesure.
EP14823988.2A 2013-12-23 2014-12-22 Dispositif de rectification de cylindre et procédé de rectification d'un cylindre Active EP3086901B1 (fr)

Applications Claiming Priority (2)

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DE102013021800 2013-12-23
PCT/EP2014/078979 WO2015097146A2 (fr) 2013-12-23 2014-12-22 Dispositif de rectification de cylindre et procédé de rectification d'un cylindre

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JP (1) JP6337125B2 (fr)
CN (1) CN105848826B (fr)
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CN114589556A (zh) * 2022-04-07 2022-06-07 山东鹤鹏技术有限公司 一种石油油田用钻杆打磨抛光装置
CN114894147A (zh) * 2022-05-20 2022-08-12 南通迅达橡塑制造有限公司 一种带有磨削检测的铁路传送用橡胶辊
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JP2017500216A (ja) 2017-01-05
EP3086901C0 (fr) 2023-06-07
CN105848826A (zh) 2016-08-10
WO2015097146A2 (fr) 2015-07-02
JP6337125B2 (ja) 2018-06-06
CN105848826B (zh) 2018-04-13
EP3086901A2 (fr) 2016-11-02
WO2015097146A3 (fr) 2015-08-13
ES2951593T3 (es) 2023-10-23

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