JPH07276214A - Grinding device for belt of plate like body - Google Patents

Abstract

PURPOSE:To provide high grinding copying property in deflection and bending of a platelike body by dividing a contact roll which presses a grinding belt against the platelike body into a plural number of parts in the direction of overlapping them, and supporting their central parts via a pin so that they can finely turn vertically in the direction of width of the grinding belt. CONSTITUTION:As for contact rolls 6a, b, c which press a grinding belt 3 against a face to be ground of a platelike body 2 between a drive pulley 4 which rotates the grinding belt 3 in the endless condition and a follow-up pulley 5 whose position can be changed, one contact roll is provided in a central part and one contact roll each is provided on its both sides in proximity to it in such a way that their ends are overlapped by an interval of Xa. The contact rolls 6a, b, c which are supported on a grinding head 8 via an air cylinder mechanism 7 can change pressing position of the grinding belt 3 at the same time due to travel in the horizontal direction of the grinding head 8 which is engaged with a shaft 10 with a screw which rotates by a drive device Mc. Also, each central part is supported via a pin 16 and turned slightly up and down in the direction of width of the grinding belt 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt grinding apparatus applied to grind various metal plates, non-metal plates such as ceramic plates, resin plates and the like.

[0002]

2. Description of the Related Art Conventionally, in the field of steel, for example, surface flaws have been removed during the manufacturing process of steel sheets. For example, the surface flaws of the steel slab used as the material are generally often removed by grinding with a grindstone or a hot scarf. In order to obtain a smooth and smooth ground surface, it has been attempted to employ a belt grinding device in terms of flexibility and controllability of grinding. In the belt grinding apparatus for this steel plate, since the steel plate is the final product, it is required that the ground surface is beautiful as well as the grinding depth accuracy, unlike the steel piece or the like that is a rolling material.

Conventionally, as such a belt grinding device,
For example, there is a device disclosed in Japanese Utility Model Laid-Open No. 61-75953 and a wagon grinder type maintenance machine disclosed in Japanese Patent Laid-Open No. 48-17198. In these belt grinding devices, the grinding belt has a relatively short and narrow width in order to make the weight easy for the operator to handle and to improve the copying property (uniform adhesion) with respect to the bending and bending of the steel plate. Things are being used. In general, as a form of flaw generation in a steel sheet, there are many cases in which the width of a ridge line flaw, a beard, a crack, etc. is 1 mm or less to several tens of mm, and the depth is several hundred μm. , A relatively wide range of several hundred mm. This is because if a grinding belt with a narrow width has a small depth and the width is narrow and the necessary minimum width is ground, a step harmful to the quality will occur at the boundary between the ground and non-ground parts. It is customary to grind a relatively wide range in order to obtain a smooth and smooth ground surface, and since it may occur obliquely or may be densely distributed.

Therefore, when grinding with a wagon grinder, it is necessary to move the entire grinding device back and forth while swinging the entire grinding device by lever operation to perform predetermined flaw maintenance, which requires complicated operation and is a heavy labor. In addition, since the grinding belt has a short life, it needs to be frequently replaced, and it is difficult to say that it is a preferable working condition for the operator of the grinding machine because it is exposed to grinding dust and dust during grinding.

On the other hand, as an automatic grinding apparatus, Japanese Patent Laid-Open No.
There is an invention disclosed in Japanese Patent Laid-Open No. 2154. In this grinding apparatus, a plurality of narrow grinding belts having an axis parallel to the steel sheet transfer direction are arranged in the steel plate width direction so as to be swingable with a minute gap in the steel plate transfer direction, and the steel plate bends, By changing the rocking (tilting) position of each contact roll with respect to bending, it is possible to improve the copying property with respect to the steel plate.

However, such a grinding machine seems to be effective in obtaining a uniform ground surface over the entire surface of the steel sheet, but the grinding belt has a short life and a large number of belts.
Since it is necessary to frequently change the work, productivity of grinding is reduced, and when performing partial grinding with the steel plate stopped, it is necessary to move a plurality of contact rolls so that the flaw part can be ground. Complex control,
When grinding a steel sheet in a transfer state, there are problems that more complicated control is required, that a step is likely to occur on the grinding surface, and it is difficult to secure quality.

[0007]

Therefore, an attempt has been made to introduce an efficient belt grinding device aiming at the automation of partial grinding, but the problem here is to provide an efficient grinding belt width and a steel plate. With respect to the bending and bending of the above, it is intended to secure the contouring property of grinding, to secure the grindability stably, and to obtain a ground surface of good quality. INDUSTRIAL APPLICABILITY According to the present invention, in the case of partial flaw maintenance by belt grinding of the plate-shaped body, an efficient maintenance width can be obtained by one grinding, and the copying property of the plate-shaped body can be easily secured against bending and bending. The present invention provides a belt grinding device that can obtain a grinding surface of excellent quality with no unevenness in the grinding surface with little variation in grinding depth.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a belt grinding apparatus which is stretched by a plurality of pulleys and rotates endlessly, in which a grinding surface of a grinding belt is pressed against a plate-like body by a contact roll to oscillate. A contact roll, which has a rotary shaft parallel to the belt width direction and is supported to move up and down through a cylinder mechanism, is divided into two or more parts in the belt width direction, and the end of the adjacent contact roll moves the grinding belt. The contact rolls are arranged side by side so that they overlap with each other, and the center of each contact roll is supported via a pin, and the pin is supported so that it can be finely rotated vertically in the width direction of the grinding belt. This is a plate-shaped belt grinding device having a feature.

[0009]

In the present invention, the contact roll for pressing the grinding belt, which is relatively wide and easy to obtain stable running and easy to lengthen, into the plate width when the plate-shaped body is partially scratched by the belt grinding. Divided into multiple parts, these short contact rolls are arranged side by side so that the ends of adjacent contact rolls overlap, and the central part is supported via pins, allowing fine rotation up and down in the width direction of the grinding belt. I have to. Therefore, it is possible to improve the contour of the plate against the bending and bending of the plate-like body, obtain an efficient grinding width with one grinding, improve the grinding efficiency and improve the grinding productivity, and The depth accuracy can be improved, the occurrence of step can be prevented, and the surface quality of the plate-shaped body after grinding can be improved.

[0010]

EXAMPLE This example is a case where the present invention is applied to the grinding and removal of surface flaws on a thick steel plate. FIG. 1 is a schematic explanatory diagram of a belt grinding line for this thick steel plate. In the figure, reference numeral 1 is an example of a belt grinding device of the present invention, which can be moved on a track R by a drive device Ma along a conveyance path of a thick steel plate 2. Further, the movable element 1 is engaged with the threaded shaft 13 rotated by the driving device Mf, and the rotation of this shaft causes the moving element 1 to move.
Can be traversed through 4.

An endless grinding belt 3 having an abrasive material on its outer surface, and a drive belt for holding the inner side surface of the grinding belt on one side and rotating it by a drive unit Mb to rotate the grinding belt 3 endlessly. 4 and a driven pulley 5 that holds the inner side surface of the grinding belt 3 on the other side and the position of the driven pulley 5 is variable.
It is provided with three contact rolls 6a, 6b, 6c for pressing the grinding belt 3 against the surface to be ground of the thick steel plate 2 between the grooves. The grinding head 8 that supports each of these contact rolls via the air cylinder mechanism 7 is engaged with the engaging portion of the support body 9 and is horizontally movable, and is engaged with the threaded shaft 10 that is rotated by the drive device Mc. When the shaft is rotated, the contact rolls 6a, 6 are moved horizontally by the rotation of the shaft.
The pressing position in the moving direction of the grinding belt by b and 6c can be changed at the same time.

Therefore, the rotary shaft of the driven pulley 5 is variable in position by following the horizontal movement of the contact rolls 6a (6b, 6c). That is, the driven pulley 5 is supported by the engaging groove portion of the support body 9 so as to be horizontally movable, and the driving device M
It is attached to a moving element 12 that engages with a threaded shaft 11 that rotates by d so that it can be moved horizontally. The horizontal movement amount of the driven pulley 5 is the movement amount of the contact roll 6a (horizontal movement amount + vertical movement amount).
The driven pulley 5 horizontally moves following the displacement (horizontal movement + vertical movement) of the contact roll 6a (6b, 6c).

The positional relationship between the contact roll 6a and the driven pulley can be obtained in advance by numerical calculation and can be automatically controlled. To detect the movement amount of the contact row 6a for this purpose, the movement position detection sensor Sa and the vertical position detection sensor Sb are used. In this embodiment, each of the contact rolls 6a, 6b, 6c is supported by a pin 16 at its central portion, and the contact rolls 6a, 6b, 6c can be finely rotated up and down in the width direction of the grinding belt 3 about this pin, It is possible to easily follow the bending and bending of the steel plate 2 in the belt width direction, and it is possible to obtain considerably improved adhesion as compared with the case where the contact roll is not divided.

Further, regarding the bending and bending of the belt in the longitudinal direction, since the air cylinder mechanism has followability,
This ensures the copying property. In this example, the spring is used as a stopper for the minute rotation of the contact roll, but a bolt or the like may be used to provide a minute gap in this portion. As for the positional relationship of these three contact rolls, as shown in FIG. 1 (c), one (6a) is arranged in the central portion, and both ends are overlapped with each other so that they are close to the contact roll 6a. One (6b, 6c) is provided side by side, and the pressing surface of the grinding belt by these contact rolls is continuous in the width direction of the thick steel plate 2 as shown in FIG. Since an appropriate curvature is provided on the surface, a smooth ground surface can be obtained without causing a step on the ground surface due to the edge of the contact roll or the belt.

When the surface flaw of the thick steel plate 2 is ground by this grinding device, the grinding device is previously positioned at a predetermined position with respect to the conveying path of the thick steel plate in accordance with the range of occurrence of the surface flaw of the thick steel plate. , The thick steel plate is carried under the belt grinding device 1 by the transport roller 18, and the position is fixed by the stopper-19, and then the driving pulley 4 is driven by the driving device Mb to rotate the grinding belt 3. The driving device Mc moves the grinding head 8 through the threaded shaft 10, and at the same time, the driving device Md displaces the driven pulley 5 through the threaded shaft 11 to contact the contact roll 6a (6).
b, 6c) to a predetermined position to move the air cylinder mechanism 7
Is operated to press the grinding surface of the grinding belt 3 against the surface of the thick steel plate 2 with a predetermined pressing force to grind and remove the surface flaws of the thick steel plate.

Regarding the control of the pressing force of the grinding belt 3 by the air cylinder mechanism 7, the contact rolls 6a (6) according to the accumulated grinding amount are based on the grinding characteristics in consideration of the deterioration of the grinding belt which has been examined in advance in this grinding device.
b, 6c) a power program for controlling the pressing force and the number of times of grinding (obtained by an experiment in advance by control for increasing the current value of the driving device Mb at a constant rate according to the integrated grinding amount) is set. Therefore, by performing grinding with a constant grindability, it is possible to ensure a constant grinding performance and a constant grinding accuracy. Further, since the contact rolls 6 differ in the positions of 6a, 6b, and 6c in the longitudinal direction of the belt by the shift amount Xb, the grinding surface position obtained from each contact roll shifts.

Since this is not preferable in terms of quality and aesthetics, 6
A rectangular ground surface can be obtained by changing the ascending / descending timing of the air cylinders a, 6b, and 6c by the shift amount xb. If the surface flaw of the thick steel plate 2 extends in the longitudinal direction of the thick steel plate, the grinding device may be moved or the thick steel plate 2 may be moved, but these are heavy objects. Since the inertia is large and the movement and control of the movement amount are considerably difficult, in this example, as described above, the contact rollers 6a (6b, 6c) and the driven pulley 5 are displaced to contact each other. The roll is moved in parallel in the direction in which the surface flaw extends, and the grinding position is moved to perform grinding.

When the grinding range in this direction exceeds the allowable movement range of the contact roll, for example, a plurality of stoppers-19 are provided in the conveying path of the thick steel plate 2 to divide one thick steel plate 2 into a plurality of times. Consider stopping and grinding. After grinding the surface flaws of the thick steel plate 2 in this way, the stopper-19
And the carrier roller 18 transports it to the yard or to the next step. The surface flaw of the thick steel plate 2 to be ground / removed is detected visually or by using a detection device in advance, and the range and depth to be ground are marked, and the marked grinding range and depth are marked. Correspondingly, movement of the belt grinding device 1, traverse,
The pressing force of the grinding belt by the contact roll 6, the moving range, the moving speed, the number of grinding (moving) times, the displacement amount of the driven pulley 5, and the like are set and controlled.

The conditions for these settings and controls are arithmetically processed by the setter 21 or the arithmetic unit 20 at any time, and the movement, traverse, contact rolls 6a (6b, 6) of the grinding device 1 are processed.
c) lifting and lowering, horizontal movement, rotation of the drive pulley 4 (movement of the grinding belt), horizontal movement of the driven pulley 5, etc.
8 drive control devices Ca, Ce, Cc, C
Drive control is performed via b and Cd. As the structure of the contact roll, a rubber lining having an appropriate hardness is applied to the surface so as to have flexibility in order to improve the copying property.

[0020]

[Experimental Example] Surface defects of a hot-rolled thick steel plate (hereinafter simply referred to as "thick steel plate") having a width of 1.2 m, a length of 8 m, and a thickness of 22 mm obtained by rolling are as shown in FIG. It was ground and removed using a belt grinding device. In this example, the grinding belt 3 has a width of 250 mm, a length of 13 m, and a moving speed (rotational peripheral speed) of 12
It was set to 00 m / min. The distribution of surface defects and the grinding range of the thick steel plate 2 are visually inspected in advance, and the grinding range and the depth are determined according to the inspection result.
King is displayed.

Further, a power program is set in consideration of the deterioration of the grinding belt 3 which has been obtained in advance, so that the grinding amount (grinding depth) per grinding is in the range of 45 to 55 μm. , A drive device M corresponding to this grinding amount
The current value of b, the judgment conditions of the replacement time of the grinding belt, etc. are set. Under such grinding conditions, the thick steel plate 2 is guided below the belt grinding device 1 by the conveyor roller 18, and the stopper 19
Position and control the belt grinding machine 1 to
Align the end of the width of the grinding belt with the end of the width of the marked area on the surface, and contact rollers 6a, 6b,
The position of 6c is moved to the starting side of the grinding range, and the grinding surface of the grinding belt 3 is pressed against the starting position of the thick steel plate 2 to be ground.

Here, the grinding start coordinate button is pressed to set the grinding start coordinates.
The flaw depth is set, and the drive pulley 4 is driven by the drive device Mb controlled by pressing the start button through the drive control device to move (rotate) the grinding belt 3 in an endless manner, and after a predetermined number of grindings. Grind and remove surface flaws on thick steel plates. Meanwhile, the grinding belt 3 by the contact rolls 6a (6b, 6c)
The number of times of grinding is calculated according to the target value of the grinding amount per grinding and the flaw depth setting value. The driving pulley 4 is driven to move (rotate) the grinding belt 3, and the contact roll 6
The surface flaw of the thick steel plate 2 can be ground by pressing a, 6b, 6c against the surface to be ground of the thick steel plate 2 and moving from the grinding start to the end coordinates by the calculated number of grindings.

In this experimental example, the pressing force of the grinding belt by each contact roll is equivalent to 40 kgf, and the power program has a margin for a flaw depth of 200 μm.
The thickness was set to 50 μm, and parallel movement was performed to the rear end side along the surface to be ground of the thick steel plate at a speed of 5 m / min to grind the ground range of the thick steel plate having a slight concave bend in the grinding belt width direction. When the ground surface of the thick steel plate after grinding was examined, variations in the grinding depth within the ground surface were within the allowable values, there were no steps on the ground surface, and there were no burns or chattering, and the surface quality was extremely good. Was very good. FIG. 2 shows a comparison of grinding results between the case of belt grinding using a plurality of divided contact rolls (invention) and the case of belt grinding using a non-divided contact roll (conventional).

As shown in FIG. 2, in the present invention, the grinding depth accuracy, which is a requirement for the maintenance quality, is improved as compared with the case where the contact roll is not divided, and the copyability of the thick steel plate against the bending in the belt width direction is improved. The effectiveness of is clear. It should be noted that here, the bending of the steel sheet is described as a concave bending, but the same result can be obtained also for a convex bending. Incidentally, the present invention, in the belt grinding of the plate,
In order to achieve this purpose, it is necessary to secure the profiling property against bending and bending of the plate-shaped body, to eliminate the level difference in grinding, to secure the grindability stably and to perform grinding efficiently. The required belt width, contact roll, number of divided contact rolls (length), structure of pulleys and the like, mechanism (including control), etc. are not limited to those in the above-described examples and experimental examples. The same applies to the moving structure and mechanism (including control) of the belt grinding device with respect to the object to be ground (surface to be ground). Further, the present invention is not limited to the steel plate,
It can be applied to other plate-shaped bodies such as metal plates or non-metal plates.

[0025]

According to the present invention, a contact roll for pressing a grinding belt, which is comparatively wide and easy to obtain stable running and easy to lengthen, onto a plate-shaped body in the case of partial flaw maintenance by belt grinding of the plate-shaped body, Divide into multiple parts in the width direction of the belt, and arrange the contact rolls of this short length side by side so that the end parts of adjacent contact rolls overlap, and support the center part via pins to move them up and down in the width direction of the grinding belt. It is capable of fine rotation.

Therefore, it is possible to improve the contour of the plate against the bending and bending of the plate-like member, and it is possible to obtain an efficient grinding width with one grinding, thereby improving the grinding efficiency and the grinding productivity. At the same time, the grinding depth accuracy is improved, the occurrence of stepping can be prevented, and the surface quality of the plate-shaped body after grinding can be improved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the present invention, in which (a) is a partially cutaway sectional front view, (b) is a sectional view taken along the line Aa-Ab in (a), FIG. 3C is a plan explanatory view showing an arrangement example of the contact rolls in the present invention.

FIG. 2 is an explanatory view of the operation of the present invention and a conventional example.

[Explanation of symbols]

 1 Belt Grinding Device 2 Thick Steel Plate 3 Grinding Belt 4 Drive Pulley 5 Driven Pulley 6a, 6b, 6c Contact Roll 7 Air Cylinder Mechanism 8 Grinding Head 9 Support 10 Threaded Shaft (For Contact Roll) 11 Screw Shaft (for driven pulley) 12 Moving element 13 Shaft with screw 14 Moving element 15a, 15b Guide 16 pin 17 Spring 18 Conveyor roller 19 Stopper 20 Computing device 21 Setting device Ca, Cb, Cc, Cd, Ce, Cf Drive control device Ma, Mb, Mc, Md, Me, Mf Drive device R Trajectory Sa Moving position detection sensor Sb Vertical position detection sensor Xa Overlap between contact rolls Xb Position shift amount of contact rolls 6a and 6b, 6c

Claims (1)

[Claims] 1. A belt grinding device which is stretched by a plurality of pulleys and rotates endlessly, in which a grinding surface of a grinding belt is pressed against a plate-like body by a contact roll to oscillate,
A contact roll, which has a rotary shaft parallel to the width direction of the grinding belt and is supported to move up and down through a cylinder mechanism, is divided into two or more parts in the belt width direction. The contact rolls are arranged side by side so that they overlap each other when viewed from the moving direction, and the center part of each contact roll is supported via a pin, and is supported so that it can be finely rotated vertically in the width direction of the grinding belt about this pin part. A plate-shaped belt grinding device characterized by: