Roll Surface Inspection Device and Roll Grinding Method

Abstract

To perform a surface examination including a minute change spreading over a roll surface.SOLUTION: A roll surface examination device that is installed in a roll polishing machine which polishes a roll installed on a rotation stage by a rotating grinder, comprises: an examination unit that has a camera that is arranged on an extention line in a direction orthogonal to an axis direction of the roll with respect to the rotating grinder and photographs a rotating roll surface, and an illumination device irradiating the roll surface including a photographing range of the camera, and is provided movably together with a movement of the rotating grinder by a movement device of the roll polishing machine moving the rotating grinder with respect to the roll; and a control device that detects a pattern of the roll surface appearing by undulated-way generation of a difference in roll surface roughness by polishing, using a photographed image to be output from the camera during the polishing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to roll surface inspection technology and roll grinding technology.

Background Art

[0002] Since the surface of the roll affects the quality of the material to be rolled or conveyed, as described in Patent Documents 1 and 2, surface inspection is performed, and surface grinding is performed to remove unevenness and defects.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] For grinding the roll surface, a grindstone is brought into contact with the rotating roll, and the grindstone is moved in the axial direction. Thereby, the entire roll surface is ground.

[0005] On the other hand, it is known that fine changes occur on the roll surface by grinding. The fine changes on the roll surface are detected as a "pattern" by the occurrence of undulations in the difference in roll surface roughness. Typical patterns include chatter marks, feed marks, and diagonal marks.

[0006] There is a correlation between the relative displacement between the grinding wheel and the roll and the surface roughness. The causes of such minute changes include vibrations between the grinding wheel in contact with the roll surface and the contact state of the grinding wheel. For example, the grinding wheel or the grinding device itself vibrates with respect to the rotating roll, or the moving mechanism vibrates when the grinding wheel is moved in the axial direction. Also, although the grinding device rotatably holds the roll, vibrations may occur due to the roll surface undulating with respect to the rotation axis because the holding accuracy is insufficient, or vibrations due to a resonance phenomenon of the rotation speed ratio between the roll and the grinding wheel are also conceivable.

[0007] Moreover, when the way of applying the grinding wheel is insufficient, such as when the contact surface of the grinding wheel is not parallel to the roll circumferential surface, or when the edge of the grinding wheel itself is too sharp or clogged, it is conceivable that patterns will occur as minute changes during grinding.

[0008] Conventionally, minute changes that appear as patterns on the roll surface have been visually confirmed by workers after grinding. However, the appearance varies depending on the skills and experience of the workers, the working environment such as the way of lighting, the viewing angle, the surrounding brightness, the physical condition, etc., and human errors such as overlooking may also occur. For this reason, there has been a problem that it is difficult to conduct a quantitative inspection by hand. In particular, visual confirmation requires the worker to approach the rotating roll, and measures for ensuring the safety of the worker are also necessary.

[0009] Therefore, if the surface inspection for detecting minute changes that appear as patterns on the roll surface can be automated, it is possible to conduct a surface inspection that suppresses evaluation variations while ensuring the safety of the worker. However, with conventional surface inspection methods, there has been a problem that it is difficult to capture minute changes (patterns) spreading on the roll surface.

[0010] As a conventional surface inspection method, for example, there is one that uses laser reflected light described in Patent Documents 1 and 2. However, the inspection area of this method is extremely small. That is, since the laser light is locally irradiated on the roll surface, the detection accuracy of defects such as scratches is high. However, as described above, fine changes (patterns) are generated with spread on the roll surface by grinding. Therefore, it is difficult to detect them only in a locally narrow area, and it is difficult to capture fine changes unless they are detected in an area having a certain size on the roll surface.

[0011] Thus, in order to capture fine changes, it is necessary to capture them as a "surface" rather than a "point". When trying to capture fine changes (patterns) using a conventional surface inspection method that uses laser reflected light, data as a "point" obtained by locally irradiating laser light must be acquired over the entire area of a certain size, and the amount of that data becomes enormous. Also, in order to capture fine changes spreading on the roll surface, the enormous data acquired as points must be connected and analyzed as an area "surface" of a certain size. Therefore, it is difficult to operate at a practical level.

[0012] Also, in the inspection of the roll surface, it is also necessary to capture the entire surface of the roll uniformly without unevenness and without omission. Applying a conventional inspection method that uses laser reflected light makes the inspection very difficult.

[0013] An object of the present invention is to provide a roll surface inspection apparatus capable of performing a surface inspection including fine changes spreading on the roll surface.

[0014] Also, as another aspect, an object is to provide a roll grinding method capable of accurately performing grinding by feeding back the inspection result of the roll surface inspection apparatus to a roll grinding apparatus.

Means for Solving the Problems

[0015] (1) The roll surface inspection device of the present invention is provided in a roll grinding device that grinds a roll installed on a turntable with a rotary grinding wheel. The roll surface inspection device is in a direction orthogonal to the axial direction of the roll Same including a rotary grinding wheel and is arranged on an extension line, includes a camera that photographs the rotating roll surface, and an illumination device that irradiates the roll surface including the photographing range of the camera, Before the surface of the roll rotating while being ground by the same rotary grinding wheel enters the imaging range of the camera, a draining member for removing water or grinding fluid supplied for grinding from the roll surface, and has an inspection unit that is movably provided together with the movement of the rotary grinding wheel by a movement device of the roll grinding device that moves the rotary grinding wheel relative to the roll, and a control device that detects a pattern on the roll surface caused by the difference in the roll surface roughness due to grinding occurring in a wavy shape using a photographed image output from the camera. And the camera, the lighting device, and the draining member can be arranged in a row on the same extension line, and the draining member is arranged upstream in the rotation direction of the roll surface with the lighting device interposed therebetween, and the camera is arranged downstream in the rotation direction. At this time, the draining member and the camera can be configured to be arranged on opposite sides across the rotation top in the roll surface portion.

[0016] (2) In the above (1), as the draining member, a contact-type draining member that contacts the roll surface to remove the water or grinding fluid from the roll surface, or a non-contact-type draining member that blows air against the roll surface to remove the water or grinding fluid from the roll surface can be used.

[0017] (3) In the above (1) or (2), the inspection unit can be configured to be connected to a cover member that covers at least a part of the rotary grinding wheel and be arranged above the roll. At this time, the lens of the camera can be provided so as to face the central axis of the roll, and the lighting device can be configured to be fixedly arranged in a positional relationship that illuminates the imaging range with respect to the lens facing the central axis.

[0018] (4) In the above (3), the inspection unit can be configured to include an inspection unit moving device that relatively moves the inspection unit so that the lens of the camera faces the central axis of the roll with respect to the movement of the rotary grinding wheel in a direction orthogonal to the axial direction of the roll.

[0019] ( 5 ) A method of grinding a roll with a roll grinding device provided with the roll surface inspection device of the present invention includes the following steps. Here, the roll surface inspection device is in a direction orthogonal to the axial direction of the roll Same including a rotary grinding wheel of a roll grinding apparatus and is arranged on an extension line, includes a camera that photographs the rotating roll surface, and an illumination device that irradiates the roll surface including the photographing range of the camera, Before the surface of the roll rotating while being ground by the same rotary grinding wheel enters the imaging range of the camera, a draining member for removing water or grinding fluid supplied for grinding from the roll surface, and has an inspection unit that is movably provided together with the movement of the rotary grinding wheel by a movement device of the roll grinding device that moves the rotary grinding wheel relative to the roll, and a control device that detects a pattern on the roll surface caused by the difference in the roll surface roughness due to grinding occurring in a wavy shape using a photographed image output from the camera. The camera, the lighting device, and the draining member can be arranged in a row on the same extension line, and the draining member is arranged upstream in the rotation direction of the roll surface with the lighting device interposed therebetween, and the camera is arranged downstream in the rotation direction. At this time, the draining member and the camera can be configured to be arranged on opposite sides across the rotation top in the roll surface portion. Then, this method includes a step of photographing the roll surface with the camera and detecting the above pattern while grinding the roll surface with the rotary grinding wheel, and a step of controlling the relative position between the rotary grinding wheel and the roll surface based on the pattern detected by the roll surface inspection device.

Advantages of the Invention

[0020] In the present invention, since the camera is arranged on the extension line in a direction orthogonal to the axial direction of the roll with respect to the rotary grinding wheel and is provided so as to be movable together with the movement of the rotary grinding wheel by the moving device of the roll grinding device that moves the rotary grinding wheel, it is possible to accurately capture and photograph the grinding position on the roll surface during grinding.

[0021] Then, since the pattern on the roll surface generated by the difference in the roll surface roughness due to grinding occurring in a wavy shape is detected from the photographed image, variations in inspection quality can be suppressed and inspection accuracy can be improved, and since it is not necessary for the operator to approach the roll grinding device, the safety of the inspection work is ensured.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Best Mode for Carrying Out the Invention

[0023] Hereinafter, embodiments will be described with reference to the drawings.

[0024] (First Embodiment) FIGS. 1 to 3 are diagrams for explaining a roll grinding device with a roll surface inspection device according to the first embodiment. The roll can include a rolling roll for steel, a roll for papermaking, etc., and the shape of the roll and the like are not particularly limited, and it can be applied to roll surface inspection and grinding by this device.

[0025] FIG. 1 is a configuration diagram of a roll surface inspection device 100 and a roll grinding device 10 in which the roll surface inspection device 100 is installed.

[0026] In the roll grinding device 10 of this embodiment, a roll rotation driving device 1 is provided on a base 8, and a roll R to be ground (inspected) is installed between the roll rotation driving device 1 and a rotary support 1a serving as a support column. The roll R is installed between the roll rotation driving device 1 and the rotary support 1a such that its longitudinal direction (axial direction) is parallel to the base 8.

[0027] Further, the base 8 is provided with a first moving device 2 that can reciprocate left and right in the longitudinal direction of the roll R. The first moving device 2 is provided with a second moving device 3 that can move forward and backward in a direction orthogonal to the axial direction of the roll R. Thereby, the rotary grinding wheel 5 that contacts the surface of the roll R for grinding can be moved along the longitudinal direction of the roll R by the first moving device 2, and can move forward and backward with respect to the surface of the roll R (in a direction orthogonal to the rotation axis of the roll R).

[0028] The rotary grinding wheel 5 is a disk-shaped grinding wheel having a grinding surface with a predetermined width, and is rotationally driven by a rotary grinding wheel driving device 4. Further, the rotary grinding wheel 5 is provided with a cover member 6, leaving only a part including the grinding surface, and covering at least a part of the rotary grinding wheel 5.

[0029] With respect to the roll R installed in the roll rotation driving device 1, the rotary grinding wheel 5 is moved to the axial end of the roll R by the first moving device 2, and further, the second moving device 3 is used to bring the rotary grinding wheel 5 closer to the roll R to bring the grinding surface of the rotary grinding wheel 5 into contact with the surface of the roll R. Then, the surface of the roll R is ground by rotationally driving the roll R and the rotary grinding wheel 5 by the roll rotation driving device 1 and the rotary grinding wheel driving device 4, respectively.

[0030] The roll grinding device 10 is an NC machine tool controlled by a roll grinding control device 7. The roll grinding control device 7 performs drive control of a roll rotation drive device 1, a first moving device 2, a second moving device 3, and a rotary grinding wheel drive device 4. The roll grinding control device 7 controls the grinding speed by controlling the rotation speed of the roll R and the rotation speed of the rotary grinding wheel 5, advances and retracts the second moving device 3 with respect to the surface of the roll R, and variably controls the relative position between the grinding surface of the rotary grinding wheel 5 and the surface of the roll R. Note that as the roll grinding device 10 of the present embodiment, a known grinding device as described in Patent Document 2 can be applied.

[0031] Then, the roll surface inspection device 100 of the present embodiment is attached to the roll grinding device 10. With reference to FIGS. 1 and 2, the roll surface inspection device 100 will be described in detail.

[0032] The roll surface inspection device 100 includes a camera 110, a lighting device 120, a draining member 130, and a roll surface inspection device 140. The camera 110, the lighting device 120, and the draining member 130 are unitized and attached to the roll grinding device 10.

[0033] Specifically, as shown in FIGS. 1 and 2, a column member 101 is fixed to a cover member 6 of the rotary grinding wheel 5 and extends in the vertical direction. An attachment member 102 is provided at an end of the column member 101 and extends upward from the column member 101 above the roll R. The attachment member 102 is provided with an inspection unit attachment portion 103 to which the camera 110, the lighting device 120, and the draining member 130 are attached. The camera 110, the lighting device 120, and the draining member 130 are attached above the roll R as an inspection unit toward the roll R located below the inspection unit attachment portion 103.

[0034] By configuring in this way, the inspection unit can be provided so as to be movable in the axial direction and in a direction orthogonal to the axial direction together with the movement of the rotary grinding wheel 5 by the moving devices (the first moving device 2 and the second moving device 3) of the roll grinding device 10 that move the rotary grinding wheel 5 to the roll R.

[0035] As shown in FIG. 1, the camera 110 is arranged on the extension line in a direction orthogonal to the axial direction of the roll R with respect to the rotary grinding wheel 5, and photographs the surface of the rotating roll R. That is, the camera 110 is installed at a position where the surface (circumferential surface) in contact with the rotary grinding wheel 5 continuously enters the imaging range by the rotating roll R, and the imaging range becomes a predetermined-sized imaging area including the surface in contact with the rotary grinding wheel 5. Further, the lens 111 of the camera 110 is provided so as to face the central axis (center of the rotation axis) of the roll R.

[0036] The lighting device 120 irradiates the roll surface including the imaging range of the camera 110. For example, it can be composed of an LED lighting device or the like. Note that the lighting device 120 is fixedly arranged in a positional relationship for illuminating the imaging range with respect to the lens 111 facing the central axis of the roll R as shown in FIG. 2.

[0037] The inspection unit of the present embodiment further includes a draining member 130, and removes water or grinding fluid supplied for grinding from the surface of the roll R before the surface of the roll R rotating while being ground by the rotary grinding wheel 5 reaches the imaging range of the camera 110. Thereby, even during grinding, the influence of water droplets and the like can be reduced, and the surface of the roll R can be photographed by the camera 110. In particular, for inspection, that is, for imaging, since it is not necessary for an operator to manually drain the surface of the roll R, not only the draining operation, but also it is not necessary to stop the grinding operation for surface inspection, and the working efficiency of grinding and surface inspection is improved.

[0038] Note that the draining member 130 only needs to be able to contact the surface of the rotating roll R and remove water or grinding fluid from the surface of the roll R. For example, in consideration of scratches on the surface of the roll R, at least the portion in contact with the surface of the roll R can be configured to apply a relatively soft material such as resin.

[0039] Next, with reference to FIG. 2, the minute changes on the roll surface caused by grinding will be described. As described above, the difference in the surface roughness of the roll R occurs in a wavy shape and emerges as a "pattern". Representative patterns include chatter marks (vibrations) in the captured image A, feed marks in the captured image B, and diagonal marks in the captured images C and D. Further, the captured image E shows defects and the like formed on the surface of the roll R.

[0040] Such a "pattern" is not local to the surface of the roll R, but occurs with an extent in the circumferential direction of the roll R and / or in the axial direction of the roll R. In the present embodiment, the camera 110 captures the circumferential surface in contact with the grinding wheel and acquires a captured image such that the imaging range has a predetermined size. Thereby, the "pattern" formed with an extent on the surface of the roll R can be accurately captured.

[0041] In particular, since the camera 110 is arranged on the extension line in a direction orthogonal to the axial direction of the roll R with respect to the rotary grinding wheel 5 and is provided to be movable together with the movement of the rotary grinding wheel 5 by the moving device of the roll grinding device 10, regardless of the size of the diameter of the roll R, the grinding position on the roll surface during grinding can be accurately captured and imaged.

[0042] Therefore, the roll surface inspection can be automated, the variation in inspection quality can be suppressed, and the inspection accuracy can be improved. And since the work by the operator is reduced, the efficiency of the surface inspection itself can be achieved, and since the operator does not need to approach the roll grinding device 10, the safety of the inspection work is ensured.

[0043] On the other hand, the roll surface inspection device 100 of the present embodiment can perform surface inspection in real time during the surface grinding of the roll R, and this inspection result can be fed back to the roll grinding device 10 and used for grinding control in the roll grinding device 10.

[0044] For example, since there is a correlation between the relative displacement between the grinding wheel and the roll and the surface roughness, for the detected "pattern", the relative position between the grinding surface of the rotary grinding wheel 5 and the surface of the roll R is controlled, and the relative position is finely adjusted in real time while photographing the surface of the roll R until the "pattern" disappears or so that the "pattern" does not appear. In this way, the "pattern" detected by the roll surface inspection device 100 is output to the roll grinding control device 7, and feedback control based on the inspection result can be performed.

[0045] For example, according to each "pattern" shown in FIG. 2, it is possible to set in advance how to control the relative position between the grinding surface of the rotary grinding wheel 5 and the surface of the roll R. The roll grinding control device 7 performs control such as moving the rotary grinding wheel 5 closer to the surface of the roll R or increasing or decreasing the rotational speed of the roll R or the rotary grinding wheel 5 with respect to the detected "pattern". By obtaining the inspection result in real time for this grinding control and performing fine control according to the change of the "pattern", the grinding can be advanced while checking the difference in the surface roughness of the roll R one by one.

[0046] Also, the grinding control can be manually performed by an operator. In the present embodiment, the "pattern" generated on the surface of the roll R during grinding can be acquired in real time. Therefore, the operator can adjust the relative position between the grinding surface of the rotary grinding wheel 5 and the surface of the roll R via the roll grinding control device 7 so that the "pattern" disappears.

[0047] FIG. 3 is a flowchart of a roll grinding method including the roll surface inspection of the present embodiment.

[0048] First, the operator sets the roll R in the roll grinding device 10, operates the roll grinding control device 7 to move the rotary grinding wheel 5 to the grinding start position, and brings the rotary grinding wheel 5 into contact with the surface of the roll R. The roll grinding control device 7 starts grinding based on the control information such as the rotational speed of the roll R and the rotational speed of the rotary grinding wheel 5 input by the operator or input in advance (S101).

[0049] ​ When the roll surface inspection device 100 starts grinding by the grinding control device 7, the camera 110 starts photographing the area irradiated by the lighting device 120 (S102). The photographed image taken by the camera 110 is continuously input to the roll surface inspection control device 140, and the roll surface inspection control device 140 performs "pattern" detection on the photographed image (S103). For the "pattern" detection, image processing techniques such as object recognition and object detection can be applied. For example, the boundary between the bright part and the dark part can be recognized, and the area partitioned as a pattern can be identified as a "pattern". Note that for the image processing technique of "pattern" detection, a known method can be applied as appropriate. Also, a learning model using an AI algorithm for image recognition may be constructed, and each "pattern" may be learned to perform "pattern" detection.

[0050] When the roll surface inspection control device 140 determines that there is a "pattern" as a result of the "pattern" detection process (YES in S104), the roll surface inspection control device 140 outputs the detection result to the roll grinding control device 7. Then, based on the pattern detected by the roll surface inspection device 100 as described above, the roll grinding control device 7 displaces the relative position between the rotary grinding wheel 5 and the surface of the roll R and continues grinding (S105).

[0051] As described above, in this embodiment, during the grinding of the surface of the roll R by the rotary grinding wheel 5, the camera 110 photographs the surface of the roll R, and the pattern on the roll surface generated by the difference in the roll surface roughness due to grinding occurring in a wavy shape is detected in real time. Then, based on the above-described pattern detected by the roll surface inspection device 100, feedback control for displacing the relative position between the rotary grinding wheel 5 and the surface of the roll R is performed in real time.

[0052] According to this embodiment, by monitoring in real time the surface area of the roll R corresponding to the grinding surface of the rotary grinding wheel 5, "pattern" detection ⇒ grinding feedback control ⇒ "pattern" detection is performed, and the difference in surface roughness generated by the rotary grinding wheel 5 can be reduced in real time. Thereby, the working efficiency of roll grinding and surface inspection can be improved.

[0053] The roll grinding control device 7 performs feed control of the rotary grinding wheel 5 up to the grinding end position in grinding control (NO in S106, S107). After performing the feed control of the rotary grinding wheel 5 up to the grinding end position, it determines that grinding is finished and ends the grinding (YES in S106, S108).

[0054] When grinding is finished, a final inspection is performed by the roll surface inspection device 100 (S109). The roll surface inspection control device 140 outputs surface inspection control information to the roll grinding control device 7, rotates the roll R at a predetermined rotational speed, and moves it axially at a predetermined speed of the rotary grinding wheel 5 (cover member 6) while photographing the entire surface of the roll R (S110, S111). Note that the rotary grinding wheel 5 is separated from a position where it contacts the surface of the roll R.

[0055] After the roll surface inspection control device 140 photographs the entire surface of the roll R, it performs "pattern" detection processing (S112). At this time, the roll surface inspection control device 140 can generate detected "pattern" position information on the entire surface of the roll R. For example, as shown in FIG. 2, the circumferential surface of the roll R is continuously photographed, and the circumferential surface continuous photographing is further continuously performed in the axial direction of the roll R, so that the entire surface of the roll R can be grasped. Therefore, the position (coordinate information) of the "pattern" detected for the entire surface of the roll R can be mapped and output to the roll grinding control device 7 as mapping information of the "pattern" position.

[0056] In step S112, if the "pattern" is not detected, the roll surface inspection control device 140 determines that the inspection result is OK (YES in S113) and ends the final inspection (S114). On the other hand, if the "pattern" is detected in step S112, it is determined that the inspection result is NG (NO in S113), and the mapping information of the generated "pattern" position is output to the roll grinding control device 7. The roll grinding control device 7 can move the rotary grinding wheel 5 to the "pattern" position on the entire surface of the roll R based on the mapping information and perform grinding (S115). Even during this grinding, the grinding location can be photographed in real time to detect the "pattern", and grinding with feedback control can be performed. After the grinding is completed (S108), the process proceeds to the final inspection step again (S109).

[0057] In this way, by photographing the entire surface of the roll R and mapping the locations where the "pattern" is detected, only the locations (areas) where the "pattern" is detected can be ground, and the grinding operation can be performed efficiently.

[0058] As described above, regarding this embodiment, the roll surface inspection control device 140 of the roll surface inspection device 100 can be configured integrally with the roll grinding control device 7 in addition to the mode of being configured separately from the roll grinding control device 7. For example, as a function of the roll grinding control device 7, the control device of the roll surface inspection device 100 can be included.

[0059] Also, the roll surface inspection device 100 of this embodiment can be retrofitted to the roll grinding device 10 and can also be provided as an individual roll surface inspection device 100 for the existing roll grinding device 10.

[0060] Also, as an example of the draining member 130, the mode of contact with the surface of the roll R has been described as an example. However, it can also be configured to include a non-contact type draining member (draining mechanism) that does not contact the surface of the roll R. For example, as the non-contact draining member, an air nozzle connected to an air compressor is applied, and by blowing a wide air curtain against the roll surface, water or grinding fluid can be removed before reaching the shooting range.

[0061] Also, the final inspection shown in FIG. 3 is performed in a separated state at a position where the rotary grinding wheel 5 does not contact the surface of the roll R. Therefore, the inspection unit (camera 110, lighting device 120, and draining member 130) can be provided with an inspection unit moving device (not shown) that relatively moves the inspection unit so that the direction of the lens 111 of the camera 110 can always capture the central axis (center of the rotation axis) of the roll R even when the rotary grinding wheel 5 moves by the second moving device 3. Specifically, in accordance with the movement of the rotary grinding wheel 5 in the direction approaching or moving away from the roll surface by the second moving device 3, the inspection unit (attachment member 102 or inspection unit attachment portion 103) is moved in the opposite direction.

[0062] In this way, by providing a moving device that allows the inspection unit attachment portion 103, to which the camera 110, the lighting device 120, and the draining member 130 are fixed, to horizontally move in the direction approaching or moving away from the roll surface with respect to the rotary grinding wheel 5 (or the column member 101 connected to the rotary grinding wheel 5), even when the rotary grinding wheel 5 performs a roll surface inspection in a non-contact state with the roll surface, or when the rotary grinding wheel 5 moves in the direction approaching or moving away from the roll surface during grinding, the direction of the lens 111 of the camera 110 can always capture the central axis (center of the rotation axis) of the roll R.

[0063] In addition, the roll surface inspection process during grinding in the present embodiment can be performed in grinding processes such as intermediate grinding and finish grinding. The grinding process in the roll grinding apparatus 10 can be mainly divided into rough grinding, intermediate grinding, and finish grinding. In rough grinding, only grinding can be performed without performing the roll surface inspection process. Thus, the roll surface inspection process during grinding can be applied according to the grinding situation and purpose.

Explanation of Reference Numerals

[0064] 10 Roll grinding apparatus 1 Roll rotation drive device 1a Rotation pedestal 2 First moving device 3 Second moving device 4 Rotating grinding wheel drive device 5 Rotating grinding wheel 6 Cover member 7 Roll grinding control device 100 Roll surface inspection device 101 Column member 102 Mounting member 103 Inspection unit mounting portion 110 Camera 111 Lens (lens barrel) 120 Lighting device 130 Drainage member R Roll

Claims

**Claim 1** A roll surface inspection device provided in a roll grinding device for grinding a roll installed on a turntable with a rotary grinding wheel, a camera arranged on the same extension line including the rotary grinding wheel in a direction orthogonal to the axial direction of the roll for photographing the rotating roll surface, an illumination device for irradiating the roll surface including the photographing range of the camera, and a draining member for removing water or grinding fluid supplied for grinding from the roll surface before the rotating roll surface being ground reaches the photographing range of the camera; and an inspection unit movably provided together with the movement of the rotary grinding wheel by a moving device of the roll grinding device that moves the rotary grinding wheel relative to the roll, a control device for detecting a pattern on the roll surface caused by undulations in the difference in roll surface roughness due to grinding using a photographed image output from the camera during grinding, characterized by comprising: the camera, the illumination device, and the draining member are arranged in a row on the same extension line, the draining member is arranged upstream in the rotation direction of the roll surface with the illumination device interposed therebetween, and the camera is arranged downstream in the rotation direction, the draining member and the camera are arranged on opposite sides of the roll surface portion with the rotational apex therebetween, a roll surface inspection device. **Claim 2** The roll surface inspection device according to claim 1, wherein the draining member is a contact type draining member that contacts the roll surface to remove the water or grinding fluid from the roll surface, or a non-contact type draining member that blows air against the roll surface to remove the water or grinding fluid from the roll surface. **Claim 3** The inspection unit is arranged above the roll in connection with a cover member covering at least a part of the rotary grinding wheel, the lens of the camera is provided so as to face the central axis of the roll, and the illumination device is fixedly arranged in a positional relationship for illuminating the photographing range with respect to the lens facing the central axis, a roll surface inspection device according to claim 1 or 2. **Claim 4** The roll surface inspection device according to claim 3, wherein the inspection unit includes an inspection unit moving device that relatively moves the inspection unit so that the lens of the camera faces the central axis of the roll with respect to the movement of the rotary grinding wheel in a direction orthogonal to the axial direction of the roll. **Claim 5** A method of grinding a roll with a roll grinding apparatus provided with a roll surface inspection apparatus, comprising: The roll surface inspection apparatus includes: a camera that is arranged on the same extension line including the rotary grinding wheel of the roll grinding apparatus in a direction orthogonal to the axial direction of the roll and photographs the rotating roll surface; an illumination device that irradiates the roll surface including the photographing range of the camera; and a draining member that removes water or grinding fluid supplied for grinding from the roll surface before the rotating roll surface being ground by the rotary grinding wheel reaches the photographing range of the camera. An inspection unit is provided so as to be movable together with the movement of the rotary grinding wheel by a moving device of the roll grinding apparatus that moves the rotary grinding wheel relative to the roll. a control device that detects a pattern on the roll surface caused by a difference in roll surface roughness due to grinding occurring in a wavy shape using a photographed image output from the camera. The camera, the illumination device, and the draining member are arranged in a row on the same extension line, the draining member is arranged upstream in the rotation direction of the roll surface with the illumination device interposed therebetween, and the camera is arranged downstream in the rotation direction. The draining member and the camera are arranged on opposite sides of the roll surface portion with the rotation apex therebetween. During grinding of the roll surface with the rotary grinding wheel, photographing the roll surface with the camera and detecting the pattern; Based on the pattern detected by the roll surface inspection apparatus, controlling the relative position between the rotary grinding wheel and the roll surface; A grinding method characterized by including the above steps.

Images