JPH106200A - Grinding wheel applying method and device for rolled steel plate surface inspection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of grinding wheel applied on the surface of a steel plate being moved for rolled steel plate surface inspection. SOLUTION: Plural cylindrical grinding wheels 3 are provided to polish the surface of a steel plate 1 being moved. The grinding wheels 3 are pivotally supported on a shaft 5, which is provided perpendicular to the moving direction of the steel plate 1, via a spring 4 at preset spaces. The spring 4 pushes the grinding wheels 3 against the shaft 5 at a constant pressure and operates as a cushioning mechanism between each grinding wheel 3 and the shaft 5. When the rotating grinding wheels 3 are pressed against the surface of the steel plate 2 being moved for polishing, the grinding wheels 3 can be moved to be freely eccentric on the shaft 5 while following the shape of the steel plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for detecting the presence or absence of defects on the surface of a steel sheet in a manufacturing process line of a rolled steel sheet, in particular, a cold-rolled steel sheet, a surface-treated steel sheet, and a strip (coil etc.) thereof. And a method and an apparatus for grinding the surface of the workpiece. More specifically, the present invention relates to a technique for improving production efficiency by grinding with a rolled steel sheet being moved on the exit side of a process line.

[0002]

2. Description of the Related Art Invisible minute defects (scratches) on the surface of a steel sheet, for example, minute defects such as push flaws and scratches due to deposits on the roll surface, are usually polished with a grindstone. In most cases, this inspection is performed on the exit side of the process line because scratches can be visualized by an inspection called “grinding”. Recent continuous line CA
In the case of L (continuous annealing line), EGL (electrogalvanizing line), etc., the line efficiency is actually reduced because the passing of the sheet is stopped to perform this inspection. Therefore,
Do not stop the line as a measure to prevent line efficiency
It is desired to develop a method of continuously grinding a steel sheet during threading, and the following apparatus has been proposed.

Conventional technique 1: Japanese Utility Model Laid-Open No. 6-5856 Japanese Utility Model Laid-Open No. 6-5856 discloses a conventional technique of an arc moving method using a wiper method. Prior art 1 has the following problems.

[0004] Since a grinding stone is attached to the tip of the long arm, the pressing pressure cannot be controlled well. Because of the wiper system, that is, the pendulum structure, derailment occurs due to centrifugal force at the turning point at the end of the plate.

Conventional technique 2: Japanese Utility Model Application Laid-Open No. 63-7450 [0006] A belt-shaped grinding body (sandpaper) is applied to a steel sheet 1 being passed.
Japanese Utility Model Application Laid-Open No. 63-7450 discloses a technique for pressing the thirteen. FIG. 14 is a perspective view showing Japanese Utility Model Application Laid-Open No. 63-7450.

Conventional technique 3: Japanese Utility Model Laid-Open No. 2-63957 Japanese Utility Model Laid-Open No. 2-63957 discloses a technique for pressing the grindstone 14 against the steel sheet 1 being passed. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows Unexamined-Japanese-Patent No. 2-63957.

The prior arts 2 and 3 are systems in which a grinding body and a grindstone are pressed against a steel sheet being passed with a predetermined pressure to grind the steel sheet surface continuously in the longitudinal direction of the coil. However, the prior arts 2 and 3 have the following problems.

[0008] Because of the single roll system, it is not possible to make the grinding wheel mounting surface uniform in the width direction of the plate. The grinding wheel is damaged by the edge of the plate, and some parts are not polished.

Prior Art 4: Japanese Utility Model Application Laid-open No. Sho 59-183745 As a technique for grinding wheels with rolls, Japanese Utility Model Application Laid-Open No. Sho 59-18
No. 3745 is disclosed. FIG.
FIG. 17 is a front view showing 183745, and FIG. 17 is a side view. The prior art 4 is a method in which polishing is performed by a single roll (sandpaper roll) 15 in which sandpaper or the like is wound around a roll body. However, there are the following problems as in the above-described prior art.

[0010] The grinding surface cannot be made uniform in the plate width direction. The grinding wheel is damaged by the edge of the plate, and some parts are not polished.

[0011]

The above prior arts are all related to a technique of continuously grinding a moving steel plate or a steel strip, but have the above-mentioned problems. Practical use and utilization have not been achieved. The problems of the prior art are summarized as follows.

In the conventional mainstream method of stopping a steel plate and hanging a grindstone, the line efficiency is reduced, and a production loss occurs in a continuous line such as CAL. In the related art in which a grindstone such as a grindstone or a sandpaper is simply pressed onto a passing plate, a portion that is not polished occurs depending on the width direction of the plate, and there is a sufficient possibility that a serious defect may be missed.

A method of moving a single grindstone along a predetermined locus, for example, a wiper method has been proposed as a continuous grindstone hanging means. However, in a continuous line such as CAL and EGL, a threading speed of 30 to 60 mpm is used. In terms of speed, the speed of the steel plate is higher than the speed of the grindstone, so that the grindstone does not hang on the entire surface of the plate, and further, there is a problem in the grinding accuracy, particularly uniformity, in the width direction of the plate.

In other words, the above-mentioned prior art is intended to continuously grind the entire surface of the steel sheet by a single grinding body (grinding wheel). For the purpose,
There was a reduction in the polishing performance on the entire surface of the steel sheet during movement, and a limit in the ability to follow the shape of the steel sheet, such as unevenness.

As described above, the conventional in-line grinding method, that is, the grinding method in the state where the process line is passed, has a great need not only in Japan but also overseas, and its development is desired. However, satisfactory results have not been obtained.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to efficiently perform a uniform grinding on a surface of a steel sheet while moving the steel sheet on a process line. It is to provide a method and an apparatus.

[0017]

According to the first aspect of the present invention,
In order to detect the presence or absence of a rolled steel sheet surface defect, in a method of grinding the surface of the rolling rolled steel sheet during movement, a rotating shaft is provided in a direction perpendicular to the moving direction of the rolled steel sheet, and an elastic body is provided on the rotating shaft. A plurality of cylindrical whetstones through
The grinding wheel rotated by the rotating shaft is eccentrically moved with respect to the rotating shaft to make the grindstone contact the surface of the rolled steel plate and polish while following the irregularities of the rolled steel plate. It has.

According to a second aspect of the present invention, in the method of the first aspect, the elastic body comprises a spring provided between the rotating shaft and the grinding stone.

According to a third aspect of the present invention, in the method according to the first aspect, the elastic body comprises a gas-tight body provided between the rotating shaft and the grinding wheel, and a gas pressure in the gas-tight body. By controlling the pressure, the pressing pressure of the whetstone against the rolled steel plate is controlled.

According to a fourth aspect of the present invention, in the method of the first, second or third aspect, the rotating shaft is movable in the axial direction so that the grinding wheel is movable in a direction orthogonal to the moving direction of the steel plate. The feature is that uneven wear of the grinding wheel is prevented by moving the grinding wheel in the direction.

The invention according to claim 5 is the invention according to claims 1, 2, and 3.
Or the method according to 4, wherein a plurality of rows of the plurality of grindstones fixed to the rotating body are provided in a plurality of rows upstream and downstream in a moving direction of the rolled steel sheet, and in the rows upstream and the rows downstream, the grindstones are provided. Are arranged in a zigzag pattern with their positions shifted in a direction perpendicular to the direction of movement of the rolled steel sheet, thus improving the uniformity of the polished surface of the rolled steel sheet.

According to a sixth aspect of the present invention, there is provided an apparatus for grinding a surface of a moving rolled steel sheet with a grindstone in order to detect the presence or absence of a surface defect of the rolled steel sheet. A rotating shaft rotatable about an axis, and a plurality of cylindrical grindstones fixed to the rotating shaft via an elastic body, wherein the grindstone is formed by the elastic body with respect to the rotating shaft. It is characterized by being operable eccentrically.

According to a seventh aspect of the present invention, in the device according to the sixth aspect, the elastic body comprises a spring provided between the rotating shaft and the grinding stone.

According to an eighth aspect of the present invention, in the apparatus according to the sixth aspect, the elastic body comprises a gas-tight body provided between the rotating shaft and the grindstone, and the gas pressure in the gas-tight body. By changing the pressure, the pressing pressure of the whetstone against the rolled steel plate can be controlled.

According to a ninth aspect of the present invention, in the apparatus according to the sixth, seventh or eighth aspect, there is provided a mechanism for moving the rotary shaft in the axial direction, and the mechanism causes the grinding wheel to be orthogonal to the moving direction of the steel plate. It is characterized in that it can be moved in the direction of

The invention according to claim 10 is the invention according to claims 6, 7,
In the apparatus according to 8 or 9, a plurality of rows of the grindstones fixed to the rotating body are provided in a plurality of rows upstream and downstream in a moving direction of the rolled steel sheet, and in the rows upstream and the rows downstream, It is characterized in that the whetstones are arranged in a zigzag with their positions shifted in a direction orthogonal to the direction of movement of the rolled steel sheet.

[Operation] In order to solve the above-mentioned problems, according to the present invention, it is possible to provide an in-line grindstone hooking means at a process line exit side. Green silicon carbide or brown alumina, etc., among the polishing material, the elastic body between the roll-shaped grinding wheel according to the present invention using a grinding wheel having a high grinding ratio and a good grinding ratio and the rotation axis of the roll-shaped grinding wheel, For example, a uniform grindstone mounting surface can be obtained by incorporating wheels having an elastic body made of a gas-tight body such as a spring, a resin, or an air bag in two or more rows in the plate width direction in the upstream and downstream directions of the steel plate movement. Even in the case of wide polishing of coils, etc., the rotatable grindstones attached to the rotating shaft (shaft) at regular intervals follow the unevenness by the action of the elastic body independently and perform elastic motion. It is possible to carry out a uniform grinding on a steel sheet surface.

As described above, the method of the present invention makes it possible to apply a uniform grinding wheel on-line in the rolling process, improve the accuracy of detecting surface defects of a steel sheet, and improve the product yield.

[0029]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is a side view, FIG.
FIG. 2 is a cross-sectional view illustrating the followability of the grindstone according to the first embodiment of the present invention to the shape of a steel plate. FIG. 11 is a perspective view showing the configuration of an apparatus in which the apparatus of the present invention is provided on a real line, FIG. 12 is a sectional view taken along line AA of FIG. 13, and FIG. 13 is a plan view.

As shown in FIGS. 1 to 4 and FIGS.
The grindstone hanging device of the present invention has a plurality of cylindrical grindstones 3 for polishing the surface of the moving steel plate 1 and the surface of the steel plate end 2. The grindstone 3 is axially fixed via a spring 4 to a hollow rotary shaft 5 provided in the width direction of the steel sheet (a direction orthogonal to the sheet passing direction). Multiple whetstones 3
Are arranged at predetermined intervals in the longitudinal direction of the rotating shaft 5. The rotating shaft 5 has a length whose both ends protrude from both ends of the steel plate 1 and is rotatably provided by a drive device including a servomotor 7 provided outside the steel plate. By the rotation of the rotating shaft 5, the grindstone 3 is rotatable around the shaft. The rows of the plurality of grindstones 3 are provided in two rows upstream and downstream in the steel sheet moving direction indicated by the arrow in the figure (more than two rows may be provided). The grindstones 3 in the second row Y located downstream are located at the positions of the spaces between the three, so that the grindstones 3 in the first row X and the second row Y are arranged in a staggered manner, so that the uniformity of the grindstone mounting surface is improved. Improvement has been achieved (see FIG. 1).

The grindstones 3 arranged in two rows are surrounded by a base frame 11. The rotating shaft 5 is mounted on a grinding wheel pressing device 12 provided with an elevating cylinder 9 provided on a base frame 11 and can move up and down, so that the grinding wheel 3 can also move up and down. The rotating shaft 5 can be moved in the direction of the rotating shaft (the direction perpendicular to the passing direction, ie, the width direction of the steel sheet) by the action of a mechanism (not shown) (see arrow b in FIG. 11). The grindstone 3 is also movable in the above direction.

As shown in FIG. 2 to FIG.
Are arranged with the hollow rotary shaft 5 as a central axis. A boss 6 is provided around the rotating shaft 5, and the grindstone 3 is attached to the rotating shaft 5.
(Boss part 6) and steel spring 4 provided between whetstone 3
Is fixed to the rotating shaft 5 through the shaft.

The grindstone 3 is manufactured using a grindstone material made of a polishing material such as green silicon carbide or brown alumina having a high degree of cutting and a good grinding ratio. The spring 4
An elastic body that can freely move while pressing the grindstone 3 and the rotating shaft 5 (the boss 6) at a constant pressure.
And has a function as a buffer mechanism between them. The spring 4 is attached at an angle to the rotation direction with a certain angle, so that the operation efficiency of the rotational elastic motion of the grindstone 3 is increased, and the grindstone 3 can operate eccentrically with respect to the rotating shaft 5. In addition, the ability to follow the shape of a steel plate can be improved (see FIG. 4). In applying the grindstone, the surface of the moving steel plate 1 is polished while rotating the grindstone 3 at a predetermined speed. If the rotation direction of the grindstone 3 is set such that the moving direction of the grindstone 3 in the portion in contact with the steel plate 1 is opposite to the movement direction of the steel plate 1, the polishing efficiency is good (see arrow a in FIG. 11). When a stone is hung, usually the steel sheet is under tension, but due to the medium elongation tendency of the steel sheet,
Steel plates always tend to bend in the width direction. As shown in FIG. 4, by arranging a plurality of grinding stones 3 in the longitudinal direction of the rotating shaft 5 at regular intervals, the arranged grinding stones 3 perform elastic motion, so that each of the grinding stones 3 is independently formed on the unevenness of the steel plate 1. The copying and the followability to the shape of the steel sheet 1 are improved, and a uniform grinding stone can be applied to the plate surface.

FIG. 5 is a side view showing a second embodiment of the present invention, FIG. 6 is a front view, FIG. 7 is a partially detailed view, and FIG. 8 is a diagram showing a whetstone according to the second embodiment of the present invention. It is sectional drawing explaining followability. The second embodiment differs from the first embodiment in that a gas-tight body such as an air bag is used as the elastic body. As shown in FIGS.
Is fixed to a hollow rotary shaft 5 via an air bag 8. A boss 6 is provided around the rotation shaft 5, and the airbag 8 is provided between the grindstone 3 and the boss 6. An air supply unit 10 for an air bag 8 is provided inside the rotary shaft 5.
Numeral 0 penetrates through the rotating shaft 5 and the boss 6 and communicates with the airbag 8. The airbag 8 is used to
Further, the elastic body is capable of freely moving while pressing the rotating shaft 5 (boss portion 6), and has an action as a buffer mechanism between the grindstone 3 and the rotating shaft 5. And air bag 8
By laminating the gas-tight bodies, it is possible to change the pressure of the compressed air in the air-tight bodies, and it is possible to perform delicate control of the grinding wheel hanging control. The rotating shaft 5 can be moved in the direction of the rotating shaft (a direction perpendicular to the passing direction, ie, the width direction of the steel plate) by the action of a mechanism not shown, and the grindstone 3 can also be moved in the direction. .

The airbag 8 shown in FIGS.
It is possible to finely control the followability to the steel plate 1 and the pressing force more than the spring 4 shown in FIG. Also,
Resin or the like may be used as the elastic body. FIG.
By arranging a plurality of grindstones 3 in the longitudinal direction of the rotating shaft 5 at regular intervals as shown in FIG.
By performing the elastic motion, each of the members independently follows the irregularities of the steel plate 1, the followability to the shape of the steel plate 1 is improved, and a uniform grindstone can be applied to the plate surface.

Next, the arrangement of the apparatus according to the present invention at the end of the steel plate where the grindstone is hard to catch will be described with reference to the drawings. FIG. 9 is a front view showing a normal arrangement at the center of the steel plate, and FIG. 10 is a side view showing an arrangement for preventing uneven wear of the grindstone due to the steel plate edge at the end of the steel plate. As shown in FIG.
In addition to the normal arrangement shown in FIG.
A grindstone 3a dedicated to the end of the steel plate having a width larger than that is further provided. The grindstone 3a is movable in a rotation axis direction (a direction orthogonal to the sheet passing direction, that is, a steel sheet width direction).
When grinding the steel plate end 2 with the grinding wheel, after grinding the steel plate end 2 with the grinding wheel 3a for a certain period of time, then, by moving the grinding position by a predetermined distance in the direction of the rotation axis, grinding failure due to uneven grinding of the grinding wheel is prevented. Is done.

[0037]

As described above, according to the present invention, a rolled steel sheet, in particular, a cold rolled steel sheet, a surface-treated steel sheet, and a steel sheet including an edge in a manufacturing process line of these steel strips (coils and the like) are manufactured. It is possible to grind the entire surface of the steel plate over the entire range of the width and required length. It is possible, the accuracy of steel sheet surface detection is improved and quality control is strengthened,
Yields and line productivity are greatly improved, thus providing an industrially useful effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view showing the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB of FIG. 2 showing the first embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating the followability of the grindstone according to the first embodiment of the present invention to the shape of a steel plate.

FIG. 5 is a side view showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken on line CC of FIG. 5, showing a second embodiment of the present invention.

FIG. 7 is a partially detailed view showing a second embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating the followability of a grindstone to a steel plate shape according to a second embodiment of the present invention.

FIG. 9 is a front view showing the arrangement of grindstones at the center of the steel plate.

FIG. 10 is a plan view showing a grindstone arrangement for preventing uneven wear of the grindstone due to the edge of the steel plate end when polishing the end of the steel plate where the grindstone is difficult to be applied.

FIG. 11 is a perspective view showing an apparatus configuration in which the apparatus of the present invention is provided on a real line.

FIG. 12 is a sectional view taken along line AA of FIG.

FIG. 13 is a plan view showing an apparatus configuration in which the apparatus of the present invention is provided on a real line.

FIG. 14 is a perspective view showing a conventional technique 2.

FIG. 15 is a front view showing a conventional technique 3.

FIG. 16 is a front view showing a conventional technique 4;

FIG. 17 is a side view showing Conventional Technique 4.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Steel plate end 3 Grinding stone 3a Grinding stone for steel plate end 4 Spring 5 Rotating shaft 6 Boss part 7 Servo motor 8 Air bag 9 Elevating cylinder 10 Air supply unit 11 Device base frame 12 Grinding device 13 Belt-shaped sandpaper 14 Whetstone 15 Sandpaper roll 16 Pressing cylinder

Claims (10)

[Claims] 1. A method of grinding a surface of a moving rolled steel sheet with a grindstone to detect the presence or absence of a rolled steel sheet surface defect, wherein a rotating shaft is provided in a direction orthogonal to a moving direction of the rolled steel sheet, A plurality of cylindrical grindstones are fixed to the shaft via an elastic body, and the grindstone rotated by the rotating shaft is operated eccentrically with respect to the rotating shaft to conform to the unevenness of the rolled steel plate. A method for grinding a surface of a rolled steel plate, wherein the grinding wheel is brought into contact with the surface of the rolled steel plate and polished. 2. The method according to claim 1, wherein the elastic body comprises a spring provided between the rotating shaft and the grindstone. 3. The elastic body comprises a gas-tight body provided between the rotating shaft and the grinding wheel, and presses the grinding wheel against the rolled steel plate by changing a gas pressure in the gas-tight body. The method of claim 1, wherein the pressure is controlled. 4. The grinding wheel can be moved in a direction perpendicular to the moving direction of the steel plate by moving the rotating shaft in the axial direction, and the uneven wear of the grinding stone is prevented by moving the grinding wheel in the direction. A method according to claim 1, 2 or 3, wherein 5. A plurality of rows of the grindstones fixed to the rotating body are provided in a plurality of rows upstream and downstream in a moving direction of the rolled steel sheet,
In the upstream row and the downstream row, the whetstones are arranged in a zigzag with their positions shifted in a direction orthogonal to the direction of movement of the rolled steel sheet, and thus the uniformity of the polished surface of the rolled steel sheet. 5. The method according to claim 1,2,3 or 4 for improving 6. An apparatus for grinding a surface of a moving rolled steel sheet in order to detect the presence or absence of a rolled steel sheet surface defect, wherein the apparatus is provided in a direction orthogonal to a moving direction of the rolled steel sheet.
A rotating shaft rotatable around an axis, and a plurality of cylindrical grindstones fixed to the rotating shaft via an elastic body, wherein the grindstone is eccentric to the rotating shaft by the elastic body. A grindstone hanging device for surface inspection of rolled steel sheets, which can be operated freely. 7. The apparatus according to claim 6, wherein said elastic body comprises a spring provided between said rotary shaft and said grindstone. 8. The elastic body comprises a gas-tight body provided between the rotating shaft and the grinding wheel, and presses the grinding wheel against the rolled steel plate by changing a gas pressure in the gas-tight body. 7. The device according to claim 6, wherein the pressure is controllable. 9. The apparatus according to claim 6, further comprising a mechanism for moving the rotating shaft in the axial direction, wherein the mechanism allows the grindstone to move in a direction orthogonal to a moving direction of the steel plate. 10. A plurality of rows of the grindstones fixed to the rotating body are provided in a plurality of rows in the upstream and downstream directions of movement of the rolled steel sheet, and in the upstream row and the downstream row, The apparatus according to claim 6, 7, 8 or 9, wherein the apparatus is arranged in a staggered manner, the position of which is shifted in a direction orthogonal to a moving direction of the rolled steel sheet.