JP3704846B2 - Grinding method and apparatus for surface inspection of rolled steel sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is widely used to detect the presence or absence of surface defects in rolled steel sheets formed into coils in a manufacturing process line such as rolled steel sheets, particularly cold-rolled steel sheets, surface-treated steel sheets, and steel strips (coils). The present invention relates to a grinding wheel mounting method and apparatus therefor.
[0002]
[Prior art]
In general, defects caused by changes in the state of the rolling roll, such as convex and concave rokis, linear flaws, and chatter marks, are generally very small irregularities, and are usually found by visual inspection. Have difficulty.
[0003]
However, such defects are lifted when pressed or painted, and because of the roll property, they are distributed over the entire length of the coil with periodicity, so that inspection of polishing fine scratches by grinding the steel plate surface. is necessary.
[0004]
The method of grinding on the process online has been filed by the present inventors in Japanese Patent Application No. 8-159957, but in order to improve the efficiency, in addition to the grinding method in the threaded plate, it is wound in a coil shape. It is important to use the whetstone in the state where it is left.
[0005]
Invisible fine defects (scratches) on the surface of the steel sheet, for example, fine defects such as scratches and scratches due to abnormalities on the roll surface deposits and roll surface properties, usually by polishing the steel sheet surface with a grindstone, Defects can be visualized. In most cases, this inspection is conducted on the process line exit side. In recent cold rolling mills (TCM), recoil lines (R / C), etc., the actual situation is that the line efficiency is lowered for this inspection. As a countermeasure for this, for example, the following conventional techniques have been proposed as a method for grinding a steel plate surface (hereinafter referred to as “front surface”), which is essentially a quality assurance surface.
[0006]
Prior art 1: C-direction whetstone method disclosed in Japanese Utility Model Publication No. 61-148558 (Sumitomo Metal) (see FIGS. 11, 12, and 13).
As shown in FIGS. 11, 12, and 13, the prior art 1 has a mechanism for pressing a commercially available grindstone 30 that is normally used against the steel plate 1 via a spring 31, and this mechanism is the steel plate width direction (C direction). It is a proposal of the apparatus to reciprocate. As a problem of the present invention, there is a fatal problem that it is impossible to grind the rolling direction (L direction).
[0007]
Prior Art 2: Roll system disclosed in Japanese Utility Model Laid-Open No. 7-11254 (Kawasaki Steel).
As a problem of the prior art 2, (1) the method of pressing the steel sheet with a grinding body with sandpaper or other abrasive grains applied to the roll is adopted. There's a problem. That is, in this method, the defect to be detected cannot be polished by grinding stones.
[0008]
Prior art 3: disclosed in Japanese Patent Application Laid-Open No. 7-186019 (Kawasaki Steel), a method of pressing a belt-shaped grinding body (sandpaper) on a steel plate, and disclosed in Japanese Utility Model Publication No. 2-63957 (Sumikin). A grindstone method (see FIG. 14).
[0009]
As shown in FIG. 14, this method is a method in which a grindstone 32 is pressed against a steel plate 1 in a passing plate with a predetermined pressure to continuously grind the steel plate surface in the coil longitudinal direction. However, (1) it is impossible to make the grindstone surface uniform in the plate width direction. (2) The grindstone is damaged by the plate edge, and an unpolished part is generated. There is a problem.
[0010]
Prior art 4: Japanese Utility Model Laid-Open No. 59-183745 (Kawasaki Steel), grinding wheel using a roll (see FIGS. 15 and 16).
As shown in FIGS. 15 and 16, the prior art 4 is based on a single roll (sandpaper roll) 33 in which sandpaper or the like is wound around a roll drum. The grindstone surface cannot be made uniform in the plate width direction.
(2) The grindstone is damaged by the plate edge, and an unpolished part is generated. There is a problem.
[0011]
Prior art 5: A grindstone device proposed in the direction of Japanese Utility Model Publication No. 63-7450 (FIG. 17).
As shown in FIG. 17, the prior art 5 is a technique for pressing a belt-shaped grinding body (sandpaper) 34 against the steel plate 1 in the threading plate. In this case, the grinding wheel surface cannot be made uniform. (2) The grindstone is damaged by the plate edge, and a portion that is not polished occurs. There is a problem.
[0012]
As described above, there is nothing that has been put into practical use and utilized with respect to the grinding wheel hanging technology in the state of threading.
[0013]
[Problems to be solved by the invention]
There are no satisfactory results with respect to the conventional method of grinding a coiled steel sheet. The prior art has the following problems.
[0014]
First of all, since an important development issue is after cold rolling, it is necessary to inspect a large number of coils with a grindstone, and therefore efficiency is essential.
Secondly, the surface that is usually grinded is often grinded on the back side due to the line configuration, and the front surface that is originally the quality assurance surface is grinded, that is, the cylindrical cylindrical surface is grinded. There is no method and no prior art.
[0015]
The problems of the prior art are summarized as follows.
{Circle around (1)} The conventional mainstream method, in which the plate is stopped and whetstoned off-line, is usually subjected to surface inspection by wobbling the back surface of the steel plate.
[0016]
(2) In the method of simply pressing a grinding stone body such as a grindstone or sandpaper, as in the conventional method, to the plate in the threading plate, a portion where the grindstone is not applied in the width direction of the plate is generated, and a serious defect is overlooked There are plenty of possibilities.
[0017]
(3) A method such as a wiper method in which a single grindstone is moved along a predetermined trajectory has been proposed in the past as several continuous grindstone hanging means. However, in continuous lines such as CAL, the plate feed speed ( (Steel plate speed) is 30-60 mpm, the steel plate speed is faster than the grindstone speed, no grindstone is applied to the entire steel plate surface, and the grindstone accuracy in the plate width direction, especially the uniformity of the grindstone surface. There was a problem.
[0018]
(4) That is, the above-mentioned conventional techniques are all intended to grind the back surface of the steel sheet with a single grinding body (grinding stone), and when in-line grinding on the line exit side is intended, There was a limit to the uniformity of the grinding wheel performance and the ability to follow the steel plate shape.
[0019]
Therefore, the object of the present invention is to solve the above-mentioned problems and to efficiently grind the surface of the coiled rolled steel sheet formed into a cylindrical shape, that is, the front surface which is originally a quality assurance surface, An object of the present invention is to provide a grinding wheel mounting method and apparatus for surface inspection of a rolled steel sheet.
[0020]
[Means for Solving the Problems]
The invention according to claim 1 is a method of grinding a surface of a coiled rolled steel sheet formed in a cylindrical shape in order to detect the presence or absence of surface defects on the surface of the rolled steel sheet. In polishing, the grindstone body is brought into contact with the outer peripheral surface of the coiled rolled steel sheet, and the contacted grindstone body is rolled in the rolling direction and the width direction of the coiled rolled steel sheet along the outer peripheral surface of the coiled rolled steel sheet. This is a grinding wheel mounting method for surface inspection of a rolled steel sheet characterized by being moved and polished.
[0021]
The invention according to claim 2 moves the grindstone body by a predetermined distance in the rolling direction of the coiled rolled steel sheet, and then moves the grindstone body in the width direction of the coiled rolled steel sheet approximately the same distance as the width of the grindstone body. And then moving the predetermined distance in a direction opposite to the rolling direction in which the grindstone body was first moved, and then moving the grindstone body in the width direction by substantially the same distance as the width of the grindstone body. And the operation is repeated to polish the surface of the steel sheet.
[0022]
In the invention according to claim 3, when the outer peripheral surface of the coiled rolled steel plate made of a cold rolled steel plate is polished, the pressing pressure of the grindstone body against the coiled rolled steel plate is set to 0.3 to 0.5 kgf / cm. ² and the moving speed of the grindstone body is controlled to 2.0 m / sec or less. .
[0023]
In the invention according to claim 4, when the outer peripheral surface of the coiled rolled steel plate made of a pressure-regulated steel plate is polished, the pressing pressure of the grindstone body against the coiled rolled steel plate is 0.2 to 0.3 kgf / cm ^2. And the moving speed of the grindstone body is controlled to 1.5 m / sec or less.
[0024]
The invention according to claim 5 is an apparatus for grinding the surface of a coiled rolled steel sheet formed in a cylindrical shape in order to detect the presence or absence of surface defects on the surface of the rolled steel sheet. A guide rail provided in the width direction of the coiled rolled steel sheet, a guide rail moving mechanism for reciprocating the guide rail along the arcuate outer peripheral surface in the rolling direction of the coiled rolled steel sheet, and the guide rail The grindstone body that is allowed to travel along the surface of the coiled rolled steel sheet is polished along the width of the coiled rolled steel sheet by moving along the guide rail. It is possible to move the guide rail along the arc-shaped outer peripheral surface of the coiled rolled steel sheet by the guide rail moving mechanism. An inspection stone hooking device surface of the rolled steel sheet characterized in that it is capable polishing a surface in the rolling direction.
[0025]
The invention according to claim 6 is an apparatus for grinding a surface of a coiled rolled steel sheet formed in a cylindrical shape in order to detect the presence or absence of surface defects on the surface of the rolled steel sheet, in proximity to the coiled rolled steel sheet. A guide rail provided in the width direction of the coiled rolled steel sheet, a guide rail moving mechanism for reciprocating the guide rail along the arcuate outer peripheral surface in the rolling direction of the coiled rolled steel sheet, and the guide rail A grindstone moving body that can travel along the wheel, a damper mechanism provided in the grindstone moving body, and a grindstone body that is attached to the damper mechanism by a rotating hinge, and the grindstone body includes the damper mechanism and the rotating hinge. It is possible to follow the irregularities on the surface of the coiled rolled steel sheet, and the grindstone body brought into contact with the surface of the coiled rolled steel sheet is The surface of the coiled rolled steel sheet can be polished in the width direction by moving along the rail, and the guide rail is moved along the arcuate outer peripheral surface of the coiled rolled steel sheet by the guide rail moving mechanism. By this, the surface of the coiled rolled steel sheet can be polished in the rolling direction.
[0026]
The invention according to claim 7 is characterized in that the grindstone body is divided into a plurality of parts and arranged vertically and horizontally.
The invention according to claim 8 is characterized in that the grindstone body is divided into a plurality of pieces and arranged in a staggered manner.
[0027]
The invention according to claim 9 is characterized in that an intermediate material made of an elastic body is provided between the grindstone body and the damper mechanism to improve adhesion to the coiled rolled steel sheet. It is what you have.
[0028]
The invention according to claim 10 is characterized in that a polishing powder discharging mechanism for discharging polishing powder is provided in a groove portion that forms a boundary between the grindstone bodies divided into a plurality of parts.
[0029]
In order to detect surface defects, it is necessary to grind the rolling direction (longitudinal direction) of the coil and the width direction (direction orthogonal to the longitudinal direction) of the coil. Therefore, in order to grind the wheel in the rolling direction of the cylindrical coiled steel plate, it is necessary to reciprocate (swing) the grindstone body along the arcuate curved surface. Therefore, in order to move the grindstone body along the arcuate curved surface of the coil, the movement center of the grindstone body is made to coincide with the central axis of the mandrel holding the coil. Thus, the grindstone body can be swung on the same axis regardless of the size of the coil.
[0030]
In order to finely control the followability and the pressing force to the coiled steel plate having an arcuate curved surface, a damper mechanism such as an air cylinder and a rotary hinge are used as a cushioning material. Further, an elastic body such as rubber and a spring are used. By changing the pressure of the compressed air in the airtight body of the air cylinder, it is possible to control the whetstone delicately, and whetstone can be hung along the outer peripheral surface of the uneven steel plate.
[0031]
In order to improve the followability and conformability to the steel sheet surface, the grindstone body is not an integral structure, but the grindstone body is divided into a predetermined size, and the divided grindstone bodies are arranged vertically and horizontally in a grid shape, or each By shifting the grooves that form the boundaries between the grindstone bodies for each row and arranging them in a staggered manner, it is possible to carry the grindstone with high accuracy. Furthermore, it is also possible to discharge fine scouring powder from the groove portion, and this makes it possible to grind the stone with high accuracy without scratching the surface of the steel plate.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the grindstone hanger according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a side view. As shown in FIG. 1 to FIG. 3, the grindstone hanging apparatus A of the present invention includes a grindstone body 6 provided so as to be in contact with the outer peripheral surface of the coil 1 having an arcuate curved surface, and the rolling direction of the coil 1 and It is provided so as to be movable in the width direction, and the surface of the coil 1 is polished by moving the grindstone body 6 in the rolling direction and the width direction along the curved surface of the outer peripheral surface of the coil 1.
[0033]
The coil 1 is disposed on the exit side of the production process line for rolled steel sheets in a state of being wound by a mandrel 16 and a mandrel driving unit 17.
As the grindstone body 6, it is preferable to use a polished material such as green silicon carbide or brown alumina. However, the material of the grindstone body is not limited to the above.
[0034]
The grindstone hooking apparatus A is configured so that the width of the coil 1 is set at a position separated from the coil 1 by a predetermined distance for guiding the grindstone body 6 in the width direction of the coil 1 (C direction, denoted by C in FIG. In the direction, the linear guide rail 7 provided horizontally in parallel with the generatrix of the coil 1 and the grindstone body 6 with the arcuate curved surface in the rolling direction of the coil 1 (that is, the same as the longitudinal direction of the coil 1) (L A circular guide rail 8 provided in the circumferential direction of the coil 1 is provided at a position away from the coil 1 for guiding in the direction, indicated by a symbol L in FIG.
[0035]
The grindstone body 6 is attached to a grindstone moving body 18 provided so as to be movable along the guide rail 7 by a flange 27 and an air cylinder 25. Reference numeral 9 denotes a grindstone traveling drive motor for causing the grindstone moving body 18 to travel along the guide rail 7.
[0036]
One end of the guide rail 7 is attached to a guide rail moving mechanism 2 provided on one side surface of the coil 1. The other end is provided on the other side of the coil 1 in the radial direction of the coil 1, and the lower end is attached to the upper end of the frame body 14 that is rotatably attached to the shaft portion of the mandrel 16. Yes.
[0037]
The guide rail moving mechanism 2 includes a ball screw type grindstone lifting drive servomotor 4 provided in the radial direction of the coil 1, and the one end of the guide rail 7 is attached to the upper end of the servomotor 4. The servo motor 4 is guided by the arc-shaped guide rail 8 by the guide rail moving mechanism 2 and can be rotated in the circumferential direction of the coil 1 around the shaft portion of the coil 1. The coil 1 can reciprocate in the circumferential direction (L direction), that is, can swing. Reference numeral 3 denotes a drive servo motor (R rack and pinion). The servo motor 4 can raise and lower the guide rail 7 in the radial direction of the coil 1, and the frame 14 can raise and lower the other end of the guide rail 7 in accordance with the raising and lowering. It has become. Thereby, the grindstone body 6 disposed on the guide rail 7 can be lowered from the standby position to the surface of the coil 1.
[0038]
The grindstone hanging apparatus A includes a sensor 10 for detecting the outer diameter of the coil 1, a sensor 11 for detecting the end surface of the coil 1, an air cylinder 12 for backrest (retraction) of the steadying center, a steadying center 15, and A shock absorber for reversing the swinging direction and a stopper device 13 are provided to soften the shock at the end when the mechanism swings.
[0039]
The grindstone body 6 is movable in the longitudinal direction (L direction) and the width direction (C direction) of the coil 1 by a grindstone hanging device A having these mechanisms.
4 is a front view showing a mounting structure of a grindstone body according to the grindstone hanging apparatus of the present invention, FIG. 5 is a side view, and FIG. 6 is a bottom view. As shown in FIGS. 4 to 6, the grindstone body 6 is composed of an aggregate of a plurality of grindstone bodies 6 a having a contact surface with the coil 1 having a predetermined size, for example, a square of about 20 × 20 mm. ing. The plurality of grindstone bodies 6a are elastic bodies having a predetermined thickness, for example, on the bottom surface of the rectangular flexible rubber 22, as shown in FIG. 6 in a vertical and horizontal grid pattern, and in this embodiment, 36 (6 × 6 Are arranged. Although not shown, the grindstone bodies 6a may be arranged in a staggered manner by shifting the grooves that form the boundaries between the grindstones for each row. Further, a polishing powder discharge mechanism may be provided in the groove portion between the grindstone bodies 6a, and fine polishing powder may be discharged from the groove portion between the grindstone bodies 6a.
[0040]
On both sides of the flexible rubber 22, a plurality of universal joints 23 provided with link balls are provided in parallel in the horizontal direction. Each of the universal joints 23 is attached to the lower end of the air cylinder 25 via the attachment plate 5. The grindstone body 6 is given a downward pressing force by the cylinder 25 provided between the grindstone moving body 18 and the universal joint 23. In this embodiment, as shown in FIGS. 4 to 6, six universal joints 23 are provided on both sides of the rubber 22.
[0041]
On the other hand, a rotary swing mechanism 24 including a link ball is attached to the upper surface of the rubber 22. The rotary swing mechanism 24 is attached to the lower end of the mounting flange 27, and the rotary swing mechanism 24 has a vertical slide part 24a. The grindstone body 6 can swing freely on a spherical surface around the link ball by the action of the rotary swing mechanism 24. The rotary swing mechanism 24 and the universal joint 23 improve followability to the coil (steel plate) shape. Further, between the flange 27 and the upper surface of the rubber 22, a grindstone pressing spring 26 is provided around the rotary swing mechanism 24, and the rubber 22 is given a force of pressing downward by the spring 26. ing. Due to the action of the cylinder 25, the universal joint 23, the rotary swing mechanism 24, the rubber 22 and the spring 26, the grindstone body moves to the curved surface at the arc-shaped curved surface portion of the coil 1 as shown by 66a in FIG. Can be imitated. The rubber 22 also has a function as a shock absorbing mechanism for impact received from the coil 1.
[0042]
When grinding a wide steel plate such as a coil or a steel plate, the surface of the steel plate is usually not always flat in the plate width direction due to a squeezing due to the shape of the plate or a tendency to stretch in the middle. In the present invention, in order to improve the followability to the steel plate shape, a plurality of mounted grindstone bodies 6a as shown in FIG. 4 to FIG. Further, by combining with the flexible rubber 22, a uniform grinding wheel can be hung on the surface of the coil (steel plate) 1.
[0043]
Next, the grindstone pattern according to the present invention will be described.
7 and 8 are explanatory views showing a first pattern of the grinding stone applying method according to the apparatus of the present invention. FIG. 7 is a perspective view showing a pattern in the rolling direction (hanging in the L direction), and FIG. 8 is a plan view showing hanging in the L direction as viewed from the top of the coil. As shown in FIG. 7 and FIG. 8, the grindstone is hung while feeding one pitch (predetermined dimension, for example, grindstone width) in the width direction while reciprocating (swinging) in the rolling direction (L direction).
[0044]
In this way, the grindstone body is reciprocated (oscillated) in the coil rolling direction, and the surface of the steel sheet is uniformly grinded by following the irregularities while finely moving in the coil width direction successively at a predetermined pitch. be able to.
[0045]
FIG. 9 and FIG. 10 are explanatory views showing a second pattern of the grinding stone applying method according to the device of the present invention. FIG. 9 is a perspective view showing a pattern in the plate width direction (C direction hanging), and FIG. 10 is a plan view showing the C direction hanging as viewed from the upper surface of the coil. As shown in FIGS. 9 and 10, automatic grinding is applied while feeding one pitch (for example, grinding wheel width) in the rolling direction while reciprocating (swinging) in the width direction (C direction).
[0046]
In this way, uniform grinding stone polishing can be performed on the surface of the steel sheet by following the irregularities while finely moving the grindstone body in the coil rolling direction at a certain predetermined pitch while reciprocating the grindstone body in the coil width direction.
[0047]
【Example】
Next, the present invention will be described with reference to examples.
The coil width while using the apparatus of the present invention shown in FIGS. 1 to 6 and applying the grindstone by reciprocating (swinging) the grindstone body in the coil longitudinal direction (rolling direction) according to the patterns shown in FIGS. Grinding to finely move in the direction (sheet width direction) was performed on cold-rolled steel sheets, pressure-regulated steel sheets, and high-carbon SC-based and high-tensile steel sheets. Pressing pressure of the grinding bodies during grinding, for cold-rolled steel sheet 0.3~0.5kgf / cm ^2, tone圧鋼for plate 0.2~0.3kgf / cm ^2, and, high carbon SC systems and high The tensile steel plate was controlled to 0.5 to 0.8 kgf / cm ² . Moreover, the moving speed of the grindstone was controlled to 2.0 m / sec or less. As a result, it was uniformly polished, and an optimum whetstone could be implemented for defect detection.
[0048]
【The invention's effect】
As described above, according to the present invention, uniform grinding stones can be applied to the outer peripheral surface of the coiled steel plate on the delivery side of the rolling process, and the entire width including the edge of the rolled steel plate (coil) and the required length can be obtained. It is possible to grind the entire surface over a predetermined range, and it is possible to adjust the rolling according to the material of the steel strip and control the grinding wheel according to the shape of the steel strip, for example, the tendency of medium elongation, improving the surface defect detection accuracy of the steel sheet. , Improve product yield, enhance quality control, greatly improve line productivity, thus providing industrially useful effects.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a grindstone hanger according to the present invention.
FIG. 2 is a plan view showing an embodiment of the grindstone hanging device of the present invention.
FIG. 3 is a side view showing an embodiment of the grindstone hanging device of the present invention.
FIG. 4 is a schematic front view showing a grindstone holding portion structure according to the grindstone hanging device of the present invention.
FIG. 5 is a side view showing a grindstone holding portion structure according to the grindstone hanger of the present invention.
FIG. 6 is a bottom view showing a grindstone holding part structure according to the grindstone hanger of the present invention.
FIG. 7 is a perspective view showing a pattern in a rolling direction (L direction hanging) of a grindstone according to the present invention.
FIG. 8 is a plan view showing the L-direction hanging as seen from the upper surface of the coil of the grinding wheel hook according to the present invention.
FIG. 9 is a perspective view showing a pattern in a plate width direction (C direction hanging) of a grindstone according to the present invention.
FIG. 10 is a plan view showing the C-direction hanging as seen from the upper surface of the coil of the grinding wheel hook according to the present invention.
FIG. 11 is a front view showing a whetstone hanging device according to prior art 1;
FIG. 12 is a side view showing a whetstone hanging device according to prior art 1;
FIG. 13 is a perspective view showing a grindstone hanging device according to prior art 1;
FIG. 14 is a front view showing a grindstone hanger according to Prior Art 3.
FIG. 15 is a front view showing a grindstone hanging device according to prior art 4;
FIG. 16 is a side view showing a grindstone hanging device according to prior art 4;
FIG. 17 is a perspective view showing a grindstone hanging device according to prior art 5;
[Explanation of symbols]
A Whetstone hanger 1 Steel strip (coil)
2 Guide rail moving mechanism 3 Oscillating drive servo motor 4 Grinding wheel lifting drive servo motor 5 Mounting plate 6, 6a, 66a Grinding wheel body 7 Linear guide rail 8 Arc guide rail 9 Grinding wheel drive motor 10 Coil outer diameter detection sensor 11 Coil End face detection sensor 12 Stabilization center retraction cylinder 13 Shock absorber and stopper device 14 Frame 15 Stabilization center 16 Mandrel 17 Mandrel drive unit 18 Grinding wheel moving body 22 Flexible rubber 23 Universal joint 24 Rotary swing mechanism 24a Vertical slide unit 25 Grinding stone Pressing air cylinder 26 Whetstone pressing assisting spring 27 Flange 30 Whetstone 31 Spring 32 Whetstone 33 Sandpaper roll 34 Belt-shaped grinding body

Claims (10)

In order to detect the presence or absence of surface defects on the surface of the rolled steel plate, in the method of grinding the surface of the coiled rolled steel plate formed in a cylindrical shape, the coiled rolling is performed when polishing the outer peripheral surface of the coiled rolled steel plate. A grindstone body is brought into contact with the outer peripheral surface of the steel sheet, and the contacted grindstone body is moved and polished along the outer peripheral surface of the coiled rolled steel sheet in the rolling direction and the width direction of the coiled rolled steel sheet. A whetstone method for surface inspection of a rolled steel sheet. The grindstone body is moved a predetermined distance in the rolling direction of the coiled rolled steel sheet, and then the grindstone body is moved in the width direction of the coiled rolled steel sheet by a distance substantially the same as the width of the grindstone body, and then the grindstone The body is moved by the predetermined distance in the direction opposite to the rolling direction in which the body is first moved, and then the grindstone body is moved in the width direction by substantially the same distance as the width of the grindstone body. The method according to claim 1, wherein the surface of the steel plate is polished. In polishing the outer peripheral surface of the coiled rolled steel plate made of a cold rolled steel plate, the pressing pressure of the grindstone body against the coiled rolled steel plate is controlled to 0.3 to 0.5 kgf / cm ² , and The method of Claim 1 or 2 which controls the moving speed of a grindstone body to 2.0 m / sec or less. In polishing the outer peripheral surface of the coiled rolled steel plate made of a pressure-regulated steel plate, the pressing pressure of the grindstone body against the coiled rolled steel plate is controlled to 0.2 to 0.3 kgf / cm ² , and the grindstone The method according to claim 1 or 2, wherein the moving speed of the body is controlled to 1.5 m / sec or less. In order to detect the presence or absence of surface defects on the surface of the rolled steel plate, in the apparatus for grinding the surface of the coiled rolled steel plate formed in a cylindrical shape, the width direction of the coiled rolled steel plate in the vicinity of the coiled rolled steel plate A guide rail provided on the guide rail, a guide rail moving mechanism for reciprocating the guide rail along the arcuate outer peripheral surface in the rolling direction of the coiled rolled steel sheet, and a grindstone that can travel along the guide rail The grindstone body brought into contact with the surface of the coiled rolled steel sheet is capable of polishing the surface of the coiled rolled steel sheet in the width direction by moving along the guide rail, and the guide rail The surface of the coiled rolled steel sheet can be polished in the rolling direction by moving along the arcuate outer peripheral surface of the coiled rolled steel sheet by the guide rail moving mechanism. Inspection grindstone hooking device surface of the rolled steel sheet, characterized in that it. In order to detect the presence or absence of surface defects on the surface of the rolled steel plate, in the apparatus for grinding the surface of the coiled rolled steel plate formed in a cylindrical shape, the width direction of the coiled rolled steel plate in the vicinity of the coiled rolled steel plate A guide rail provided on the guide rail, a guide rail moving mechanism for reciprocating the guide rail along the arcuate outer peripheral surface in the rolling direction of the coiled rolled steel sheet, and a grindstone moveable along the guide rail And a damper mechanism provided on the grindstone moving body, and a grindstone body attached to the damper mechanism by a rotary hinge. The grindstone body brought into contact with the surface of the coiled rolled steel sheet moves along the guide rail. Thus, the surface of the coiled rolled steel sheet can be polished in the width direction, and the coiled rolled steel sheet is moved by moving the guide rail along the arcuate outer peripheral surface of the coiled rolled steel sheet by the guide rail moving mechanism. A grindstone for surface inspection of a rolled steel sheet, wherein the surface of the steel sheet can be polished in the rolling direction. The said grindstone body is an apparatus of Claim 5 or 6 divided | segmented into plurality and arranged in the length and width. The said grindstone body is an apparatus of Claim 5 or 6 divided | segmented into plurality and arranged in zigzag form. The apparatus according to claim 5, 6, 7 or 8, wherein an intermediate material made of an elastic body is provided between the grindstone body and the damper mechanism to improve adhesion to the coiled rolled steel sheet. . The apparatus according to claim 7, 8 or 9, wherein a polishing powder discharging mechanism for discharging polishing powder is provided in a groove portion that forms a boundary between each of the grindstone bodies divided into a plurality.

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