DE102004045418A1 - Method and device for grinding a roller - Google Patents

Abstract

The invention relates to a method for grinding a roll (1) on a roll grinding machine (2), in which the roll surface (3) is ground with a grinding wheel (4). To improve the economy, the method according to the invention is characterized by the following method steps: a) grinding the roll surface (3) with the grinding wheel (4) in the roll grinding machine (2); b) subsequent or simultaneous testing of the ground roll surface (3) for defects with a sensor means (5) for detecting the geometry of the roll surface (3); c) subsequently automatically evaluating the result of the roller surface test (3) according to step b) by automatically comparing the result of the test with stored data on the nature of the roller surface (3); d) automatically outputting information about the evaluation result according to step c). Furthermore, the invention relates to a roll grinding machine.

Description

The The invention relates to a method of grinding a roll on a roll Roll grinding machine, wherein the roll surface with a grinding wheel is sanded. Furthermore, the invention relates to a roll grinding machine.

at the production of ribbons and foils of metal this is rolled by means of rolling, to a defined strip thickness and also a desired surface finish is reached. To ensure a sufficient quality of the metal strip, The metal strip is involved in one of the last production steps Scanned sensor systems and examined for surface defects. The scanned images will be saved with existing error images compared and so abnormalities detected. Be classified as defective band sections discarded as a committee.

For the investigation of the metal band come commercially available Sensors used. Equally known are evaluation systems, in which a suitable image recognition software and evaluation software be used.

there it is known that a great Part of the surface defects of the metal strip caused by defects on the roll surface become. On the one hand, a distinction must be made between such errors which arise during the rolling process on the roll surface, and such mistakes, on the other hand, already in production the roller are present.

at It is well-known that the roll processing is a largely automated one Manufacturing process, the high precision of the roll surface geometry ensured by a grinding process, d. H. during the last grinding process on a new roll or during recycling already used Rolling before reuse. It also finds during roll grinding a quality control in the way that the roll surface is visually experienced by Operating personnel is inspected in order to possibly existing Close incorrect processing to be able to.

These Type of quality inspection required Substantial experience of the quality auditor, as a variety of possible Mistake to consider is. The result of the quality inspection is however, to a not inconsiderable extent subjectively and by the assessment of the auditors dependent.

A unrecognized defectiveness of the rolls during the grinding process turns up much later when rolling the bands or slides, but relatively quickly, namely already after a few hundred meters of tape length, d. h after about 3 to 4 minutes of production time.

overlooked or have incorrectly classified mistakes when grinding the rolls Therefore, a very negative impact on the economy of Production process of tapes or slides.

Of the The invention is therefore based on the object, a roll grinding process and an associated one Roll grinding machine to create, with the known disadvantages be avoided. The manufacturing process for metal strips and foils and in particular the grinding process for those used there Rolling should be more stable and independent from subjective assessments be made. Thus, the overall profitability of the Procedure increased become.

• a) Zunächst wird die Walzenoberfläche mit der Schleifscheibe in der Walzenschleifmaschine geschliffen.
• b) Anschließend oder gleichzeitig wird die geschliffene Walzenoberfläche mit einem Sensormittel zum Erkennen der Geometrie der Walzenoberfläche auf Fehler geprüft.
• c) Hieran anschließend erfolgt ein automatisches Auswerten des Ergebnisses der Prüfung der Walzenoberfläche gemäß Schritt b) durch automatischen Vergleich des Ergebnisses der Prüfung mit gespeicherten Daten über die Beschaffenheit der Walzenoberfläche.
• d) Schließlich erfolgt ein automatisches Ausgeben einer Information über das Auswerteergebnis gemäß Schritt c).

The solution of this object by the invention is characterized in that the method comprises the following steps:

• a) First, the roll surface is ground with the grinding wheel in the roll grinding machine.
• b) Subsequently or simultaneously, the ground roll surface is checked for defects by means of a sensor means for detecting the geometry of the roll surface.
• c) Following this, an automatic evaluation of the result of the roller surface examination according to step b) is carried out by automatically comparing the result of the test with stored data on the nature of the roller surface.
• d) Finally, an automatic output of information about the evaluation result according to step c).

The The invention thus provides that already in the roll grinding machine an investigation of the ground roll surface is made with respect to its geometry, this includes in particular the surface texture or microgeometry to understand that for the working behavior of the roller and the quality of the metal strip produced is crucial. Because the errors can be detected optically, because their cause is in a shape deviation from the ideal geometry lies. The invention allows It thus, from the variety of known occurring, different surface defects Automatically detect and classify defined errors in a further step automatically determined grinding parameters to change, so that When regrinding the roller, avoid the known errors.

In order to This investigation is quick and economical and on the other hand is free from subjective judgment the evaluation using a database with stored information in the manner of an expert system, the assessment being automatic, is carried out without intervention of the operator of the machine.

A Training of the invention provides that the stored data on the Texture of the roll surface Setpoint data and / or typical error data included. Below is to understand that - preferably - typical Error images are stored and used for comparison. That's exactly how it is possible that ideal, d. H. impeccable surface textures for comparison are used, which are stored.

For error checking the ground roller surface according to the above Step b), an optical sensor is preferably used.

A Particularly advantageous embodiment of the invention provides that the information output according to the above Step d) as a warning signal and then takes place when the result of Evaluation according to the above Step c) a deviation of the tested roll surface of the stored data via the nature of the roll surface results that over a specified and stored tolerance goes beyond. So it will be allowed a certain tolerance within which some geometry data the roll surface allowed to move. Becomes leave the tolerance, there is a corresponding warning, what it possible makes, even then respond, if significant processing errors have not yet occurred or if this still with little effort can be corrected.

The Output of the information according to the above step d) can be done graphically on a machine control panel. alternative or additively, it can be provided that the output of the information done in print, which offers the advantage that then one written quality documentation is present.

The Roll grinding machine for grinding a roll, which is a grinding wheel for grinding the roll surface has, is characterized according to the invention by sensor means for testing the ground roller surface and for recognizing the geometry, i. H. the surface condition or of predefined defect images of the roll surface and means for automatic Evaluate the result of the defect inspection of the roll surface.

there is preferably provided that the means for automatic evaluation the result of the test the roll surface have a memory in which data about the nature of roll surface are included.

Further can be provided that the sensor means for detecting the geometry the roll surface have a laser. Alternatively, the sensor means a Camera, in particular a digital camera, have.

With the proposed measures Is it possible, a fast and economical test and assessment of the surface geometry the ground roller before it is used. surface defects can therefore lead in one Stage are detected and corrected.

In the drawing are embodiments of Invention shown. Show it:

1 a roll grinding machine in perspective view,

2 an alternative embodiment of the roll grinding machines in perspective view,

3 the representation of a flowchart for the examination and evaluation of the result of the roll grinding process,

4 the roll grinder after 1 in front view,

5a and 5b schematically a first defect image in the form of chatter marks in the front view of the roller and in radial section through the roller,

6a and 6b schematically a second defect image in the form of facets of machine malfunctions in the front view of the roller and in the radial section through the roller,

7 schematically a third error image in the form of facets as a result of interruptions of the workpiece surface in the front view of the roller,

8th schematically a fourth defect image in the form of bleed facets in the front view of the roll,

9 schematically a fifth error image in the form of tracking facets in the front view of the roller,

10a and 10b schematically a sixth error in the form of a checkerboard ters in the front view of the roller as well as in radial section through the roller,

11a . 11b and 11c schematically a seventh defect image in the form of a twist in the front view of the roller and in axial section through the roller in two different embodiments of the spin,

12 schematically an eighth defect image in the form of a rhombus pattern in the front view of the roll,

13 schematically a ninth error image in the form of feed marks in the front view of the roller,

14a and 14b schematically a tenth error image in the form of scratches in the front view of the roller and in axial section through the roller,

15 schematically an eleventh defect image in the form of a shell pattern in the front view of the roll,

16a and 16b schematically a twelfth error image in the form of grooves in the front view of the roller and in axial section through the roller,

17 schematically a thirteenth error image in the form of clouds in the front view of the roller and

18 schematically a fourteenth defect image in the form of coarse, clearly defined marks in the front view of the roller.

In the 1 and 2 are roll grinding machines 2 to see rolls for rolling rolls of metal strips and foils. For this comes a grinding wheel 4 used, which serves for grinding the outer shell of the roller. The roll grinding machines shown correspond in design to the known machines, so that an explanation of their structure is unnecessary.

To Termination of the usual Grinding process, an inspection and assessment of the surface is included rotating roller, which in the art of an experienced Operator performed which, however, is subject to its subjective assessment.

The inventive proposal - as an alternative to the visual assessment of the roll surface by the operator - is in 3 shown.

The roll grinding machine 2 is in the embodiment with an optical sensor means 5 equipped in the form of a camera. Commercially available means in the form of video or line scan cameras, which are suitable for light-dark field detection using appropriate software, are used. Alternatively, lasers for detecting the surface condition of the roller can also be used. The sensor means best test the roll surface 3 by being positioned perpendicular to the roll surface or measured perpendicular to the surface.

The sensor means 5 optically capture the workpiece surface, ie the surface 3 the ground roller 1 , If necessary, the measured signals are converted into digital signals. In 4 is a holder 8th to recognize the sensor means 5 hold in the required position or drive these resources when needed in the required position. The sensor means 5 to scan the roll surface can thereby to the existing measuring device of the roll grinding machine 2 be grown. The measuring device is attached to a support, which runs along the roller in the longitudinal direction. With this arrangement and the movement explained above, the sensor means will feel 5 the surface 3 the rotating roller 1 spiral off. The recorded signals are stored to be compared and evaluated with a fault library (see below).

The means for automatically evaluating the measured signal are in 3 shown only very schematically and with 6 designated. The signal evaluation takes place in the machine control. This is the CNC control of the machine 2 with a memory 7 in contact with 3 is referred to as a fault library. This memory stores comparative data used to automatically assess the ground surface 3 the roller 1 to be able to make. The comparison of the sensor means 5 measured signal with the data from the error library 7 using typical error images stored there, of which in the 5 to 18 a selection is displayed, allows a statement as to whether a likewise stored tolerance for certain errors (see below) is reached or exceeded. The detected errors are therefore recorded and classified in terms of data technology (see below), which means that a wide range of applications and possible errors can be covered. However, it only comes to the detection of errors from the grinding process, not for the detection of band-specific errors, which also have a different cause than roll grinding errors.

On a machine control panel, a graphical representation of the determined values and their Ratio to a predetermined tolerance threshold are displayed. If applicable, exceedances of tolerance limits are displayed. It can in this case - ie in tolerance overruns - also triggered warnings of various kinds, eg. B. acoustic or visual signals are output.

At the Machine control console can Furthermore, test reports printed as evidence of the quality achieved.

Are the determined errors of the roll surface 3 within specified tolerances, ie within defined limits, there is an automatic release of the ground roller. If this is not the case, the work piece is locked so that targeted measures can be taken to make it fit for quality reasons (reworking).

As Thus, an automatic quality check of the ground roll takes place already on the machine. The result of the test is either the release or the blocking of the roller. This will reduce the reject rate in Rollers significantly reduced.

The described inspection method is an integral part of the grinding process in the roll grinding machine 2 itself and detects possible errors on the finished ground roll surface.

there becomes independent by the machine operator and also independent of the roll material (forged steel / cast iron) Automatically inspected after completion of grinding the roller surface and assessed. The result is logged and serves as a quality assurance record the roller for the Production of metal strip or metallic foils.

For the assignment the determined surface signals the stored typical fault images is a suitable Image recognition software (in the manner of a neural system), the as such is well known in the art.

Significant importance for the functionality of the inventive concept has, as well as possible, measured signals (images) of the roll surface 3 typical error images that are in memory 7 are deposited.

Exemplary information can be found in the 5 to 18 that show possible errors. The following description of these figures shows not only what the typical error pattern of the respective error looks like, but also what has to be changed to correct the error.

The figures, with the respective errors, are partly only schematic and show the respective errors in an exaggerated way. In most cases at least the view of the surface is shown 3 the roller 1 ,

1st chatter marks

In 5a and 5b are in the front view of the roller as well as in the radial section through the roller Chatter marks drawn (also called Mäusezähne or rockfalls). As mentioned above, the depiction is here exaggerated in order to better recognize the respective disorder.

appearance: Chatter marks are deviations of the macrogeometric shape of the surface (for example, the shape of the circular cylinder) of the length, the corresponds to the effective grinding wheel width. They are usually close together (distance: 3 to 5 mm). When length grinding their changes Location with the intersecting Feed of the grinding wheel.

Reason: The chatter marks arise from self-excited vibrations. The periodically changing forces be uneven hardness grinding wheel and workpiece, Uneven dulling of the grinding wheel u. ä. caused. The energy the vibration is obtained from the machining process. Rattermar ken especially occur when the grinding wheel is dulled or too is finely trained. Their frequency is close to natural frequencies a machine group (usually the system grinding wheel grinding wheel grinding wheel) or of the workpiece.

Remedy: Chatter marks can be achieved by dressing the grinding wheel and Use of evenly divisive Remove grinding wheels, which are also used for fine and ultra-fine grinding evenly add.

2. facets

facets are also called stripes, lines or cross passages.

appearance: Facets are deviations of the macrogeometric shape of the surfaces (z. B. of the shape of the circular cylinder) over the whole or a part the workpiece length, regardless of the effective wheel width. They are usually parallel or only slightly inclined to the workpiece axis and consist of small, mostly difficult to detect elevations and Recesses of the workpiece surface.

facets can be removed by peeling off the surface with a tinted steel strip or clearly visible with copper wire. In the latter method they kick even stronger when the workpiece surface is thin with oil and chalk is deleted.

The following Types of facets are to be flossed:

2. 1. Facets of machine malfunctions

In 6a and 6b are shown in the front view of the roller as well as in the radial section through the roller facets of machine malfunction.

Reason: These facets arise from forced vibrations of the drives (Engines) or the drive elements (gears, chains, drivers) as well by friction (unfavorable Edition of the workpiece in the buttocks, starting machine parts) and from natural vibration forms of the workpiece. ever they emerge more clearly, the more their origin is on the workpiece side to search.

Act the excitement forces only on a part of the workpiece circumference or the workpiece length, so form only cause there produced facets, but usually over the entire workpiece Nachlauffacetten (see section 2.4.).

Often, the source of interference can be determined by counting the facets or measuring their distance and correct the error. It applies to the exciter speed (in rpm) n _e = (d _W / a) × n _W , with the workpiece diameter d _W in mm, the workpiece speed n _W in rpm and the facet spacing a in mm. The excitation speed can also be a multiple of the rotational speed.

2.2. Facets as a result interruptions of the workpiece surface

In 7 Facets are shown as a result of interruptions of the workpiece surface.

Reason: When grinding interrupted workpiece surfaces (eg keyways), they shift due to the different grinding pressure workpiece and grinding wheel axis. When length grinding These displacements build up even after cutting the full workpiece circumference only slowly back off.

Remedy: Grinding with high workpiece speed, sharp grinding wheel and low cutting performance during finish grinding counteract this kind of facets.

2.3. bleed facets

In 8th are shown schematically bleed facets.

Reason: When cutting the grinding wheel on hard, smooth workpiece surfaces is the grinding pressure higher as the grinding spindle centering hydrodynamic pressure in the grinding spindle bearing or the workpiece rigidity. It builds up for a short time a self-excited vibration.

Remedy: The grinding wheel is set hard until a hard surface skin is ground down. After the intermediate dressing is changed with Cutting conditions, especially with other workpiece speed, further ground.

2.4. trailing facets

9 schematically shows an error image in the form of tracking facets.

Reason: Arising from the item 2.1. to 2.3. mentioned reasons a part of the workpiece surface facets, can be during longitudinal grinding due to the associated different grinding pressure and because of the overlap the feed of the grinding wheel obtained a vibrational state, although no causative disorder anymore is available. There are Nachlauffacetten, their appearance the cause resulting facets is the same or similar. trailing facets arise mainly on slender workpieces.

Remedy: Dressing the grinding wheel, grinding with changed Machining conditions, especially other workpiece speed and smaller cutting performance.

3. Checkerboard pattern

In 10a and 10b is in the front view of the roller and in the radial section through the roller to see a checkerboard pattern.

appearance: The checkerboard pattern is a deviation of the macrogeometric Shape of the surface, formed from the overlay of chatter marks and facets. The normally parallel to the workpiece axis running facets are interrupted by those with the feed the grinding wheel wandering chatter marks.

Cause: The self-excited vibration that creates chatter marks is overlaid with a forced vibration. The excitement usually comes from the grinding wheel side imbalances of the grinding wheel or the grinding wheel motor and its electrical errors (harmonics of the rotational speed of the grinding motor).

Remedy: Re-balancing and dressing the grinding wheel and reweighing and passive insulation of the grinding motor.

4th spin

In the 11a . 11b and 11c schematically is a defect image in the form of a twist in the front view of the roller and in axial section through the roller shown in two different embodiments of the twist.

Of the Twist is also referred to as a spiral or skew line.

appearance: The twist is a microgeometric deviation from the normal one Surface shape. It is made by evenly distributed irregularities on the workpiece surface (z. B. commas or the rest surface light or dark spots). The eye captures these irregularities as parallel lines. The slope of these lines can be anyone take any value and is the ratio of the grinding wheel speed to the workpiece speed dependent.

The following relationships apply to the distance of the (imaginary) twist lines, neglecting the helix:
Distance of the twist lines in the workpiece circumferential direction (in mm) a _du = d _W × (n _W / ns) with the workpiece diameter d _W in mm, the workpiece speed n _W in rpm and the grinding wheel rpm n _S in rpm.

Distance of the twist lines in the axial direction (in mm) a _da = V _V / n _W with the feed speed V _V in mm / min and the workpiece speed n _W in rpm.

Often superimpose There are twist lines of different appearance, so you can measure them has to sort out. Are the irregularities in the surface exactly in the direction of the workpiece axis, it is difficult to distinguish twist lines from facets.

twist let yourself, Unlike facets, by scrubbing the surface is not to emphasize more clearly, as it is not by a macrogeometric Shape error of the surface shape (continuous increase or recess) formed in the workpiece surface becomes.

Remedy: Interval switching of the roller speed. Note: An interval the grinding wheel speed does not produce uniform roughness on the roll surface.

The following Types of spin are to be distinguished:

4.1. Twist from grinding wheel failure

Reason: This twist occurs during longitudinal grinding by the processing of a non-uniform grinding wheel surface or edge on the workpiece. Possible Grinding wheel errors are u. a. an uneven hoop hardness, a damage the cutting surface or edge, a blow of the cutting edge and a placement of workpiece material on the grinding wheel.

Remedy: Use of grinding wheels of the same peripheral hardness, eliminating the damage, Reset to default the cutting edge. There are short sanding times after the last one To strive for dressing.

4.2. Twist of forced Vibration on the grinding spindle

Reason: The grinding wheel is in orbit or a multiple thereof due to inaccuracies or errors in the system grinding spindle - grinding spindle bearing excited to forced vibrations. As a result, it is loaded unevenly. Place highest, short-term stress break stronger and mark on the workpiece surface. The The resulting spin pattern usually does not differ from the twist from grinding wheel defects.

Remedy: Check the Grinding spindle and the grinding spindle bearing.

4.3. diamond pattern

In 12 the error image is sketched in the form of a rhombus pattern.

appearance: Diamond patterns are special forms of twist. They arise during longitudinal grinding with little or no grinding wheel delivery. The when sanding of the workpiece in a feed direction resulting swirl when sanding in the other direction new swirl lines superimposed without removing the original ones become.

Cause and remedy: Please refer to the above numbers 4.1 , and 4. 2. referenced.

5. Feed marks

13 shows the error image at feed marks in the front view of the roller.

Appearance: Feed marks are spiraling, steeply rising lines that depend on the workpiece speed and feed rate.

Reason: Feed marks form during longitudinal grinding due to the higher grinding pressure the cutting edge opposite the following smoothing Zones of the grinding wheel.

Remedy: Degradation of the grinding pressure and change of the relationship Workpiece speed to feed. Rounding the cutting edges of the grinding wheel.

6. scratches (commas)

14a and 14b show a defect image in the form of scratches in the front view of the roller as well as in axial section through the roller.

appearance: Scratches or commas are narrow depressions in the circumferential direction in the microgeometric shape of the workpiece surface.

Reason: Scratches or commas form on the workpiece surface due to loose grain on the surface Grinding wheel, through attached workpiece material parts on the grinding wheel and by impurities in the coolant, which are pushed to the interface between grinding wheel and workpiece. Furthermore, the grinding wheel used can be too soft.

Remedy: pressure flushing for the Grinding wheel, use of grinding wheels with large pore space, improvement the coolant cleaning, Change of coolant, Grinding in synchronism, use of grinding wheels with ceramic Binding.

7. Shell pattern

In 15 is a defect image in the form of a shell pattern, also called orange pattern, shown in the front view of the roller.

appearance: Shell patterns are macrogeometric deviations in surface shape a workpiece in the form of bowl-shaped depressions.

Reason: Shell patterns are caused by vibrations of the dressing diamond while truing, caused by faulty brackets or guide of the diamond or if the diamond is not arranged securely. Favor dull diamonds the shell pattern formation.

Remedy: Check the Dressing device and dressing diamond.

8. grooves

The 16a and 16b show a defect image in the form of grooves in the front view of the roller and in axial section through the roller.

Manifestations: Grooves are macrogeometric deviations in the surface shape of a Workpiece circumferentially in the circumferential direction at the distance of the dressing feed.

Reason: Grooves on the workpiece arise especially when plunge grinding when dressing a "thread profile" on the grinding wheel is cut. It forms especially with pointed diamonds, high dressing feed and a dressing feed per wheel revolution, the bigger than the wear surface of the diamond is.

Remedy: Reduce dressing feed and dressing feed.

9. Clouds

In 17 is a defect image in the form of clouds - also called Schlieren - shown in the front view of the roller.

Appearance: Clouds are large, in the shape irregular deviations the microgeometry of the workpiece surface, the occur only with fine or finest ground surfaces and by different Reflection become visible.

Reason: Clouds are caused by aperiodic stiffness changes between the grinding wheel and the workpiece during the course of the movement, especially in older ones Machines occurring, or by insufficient, uneven moderate pressure drop when grinding with the next coarser Grinding wheels.

Remedy: Clouds, which are generated by aperiodic stiffness changes, let can not eliminate itself with simple means. They can be reduced Be made by sanding with very low sanding pressure. In clouds, due to insufficient grinding pressure reduction must be ground again with coarser grinding wheels.

10. Coarse, clear limited marks

These are as a bug in 18 outlined.

Appearance: These markings are mostly deviations in the microgeometry of the workpiece surface, especially on finely ground surfaces due to reflection changes bar and evenly limited in their shape depending on the cause.

Reason: Actions can be from the outside (eg by impacts, the decay slowly), from the workpiece (eg limited zones of different hardness), from the machine (e.g. B. emergence of the feed drive racks on the drive pinion) or from the coolant (eg grinding slug between grinding wheel and workpiece).

Remedy: The respective deficiencies have to be eliminated.

The Storage of the respective faulty images of these and, where appropriate other typical phenomena and the comparison of the measured Signaling or image with these defect images creates the possibility reliable to close on causes of existing manufacturing weaknesses and From this not only an assessment of the quality of the ground To submit roller, but also propose parking measures.

1

roller

2

roll Grinders

3

roll surface

4

grinding wheel

5

sensor means (Camera)

6

medium for automatic evaluation

7

Storage

8th

bracket

Claims (10)

Method for grinding a roller ( 1 ) on a roll grinding machine ( 2 ), in which the roll surface ( 3 ) with a grinding wheel ( 4 ), characterized by the following process steps: a) grinding of the roll surface ( 3 ) with the grinding wheel ( 4 ) in the roll grinding machine ( 2 ); b) subsequent or simultaneous testing of the ground roll surface ( 3 ) for errors with a sensor means ( 5 ) for detecting the geometry of the roll surface ( 3 ); c) Subsequent automatic evaluation of the result of testing the roll surface ( 3 ) according to step b) by automatically comparing the result of the test with stored data about the nature of the roll surface ( 3 ); d) Automatic output of information about the evaluation result according to step c). A method according to claim 1, characterized in that the stored data on the nature of the roll surface ( 3 ) Contain target data and / or typical error data. A method according to claim 1 or 2, characterized in that for error checking the ground roll surface ( 3 ) according to step b) according to claim 1, an optical sensor ( 5 ) is used. Method according to one of claims 1 to 3, characterized in that the output information according to step d) according to claim 1 as a warning signal and then takes place when the result of the evaluation according to step c) of claim 1, a deviation of the measured roll surface ( 3 ) from the stored data about the nature of the roll surface ( 3 ) which exceeds a predetermined and stored tolerance. Method according to one of claims 1 to 4, characterized that the output of the information according to step d) according to claim 1 graphically done on a machine control panel. Method according to one of claims 1 to 5, characterized that the output of the information according to step d) according to claim 1 in printed form. Roll grinding machine ( 2 ) for grinding a roller ( 1 ), which is a grinding wheel ( 4 ) for grinding the roll surface ( 3 ), characterized by sensor means ( 5 ) for checking the ground roller surface ( 3 ) for errors and for recognizing the geometry of the roll surface ( 3 ) and means ( 6 ) for automatically evaluating the result of the roll surface inspection ( 3 ). Roll grinding machine according to claim 7, characterized in that the means ( 6 ) for automatically evaluating the result of the roll surface inspection ( 3 ) a memory ( 7 ) in which data on the nature of the roll surface ( 3 ) are included. Roll grinding machine according to claim 7 or 8, characterized in that the sensor means ( 5 ) for detecting the geometry of the roll surface ( 3 ) have a laser. Roll grinding machine according to claim 7 or 8, characterized in that the sensor means ( 5 ) for detecting the geometry of the roll surface ( 3 ) have a camera, in particular a digital camera.