JP2015006697A - Processing device and processing method of plate-like object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate-like object processing device including jet means that jets a coolant to a proper position.SOLUTION: A nozzle 26 of a chamfering device 10 of the invention is installed at a position where the nozzle 26 jets a coolant from a position, which is located at the upstream side relative to a contact position P between an annular groove 34 of a chamfering grindstone 18 and an end edge part 12A of a glass plate 12 in a rotation direction of the chamfering grindstone 18, toward the contact position P. Further, the nozzle 26 is installed at a position where the nozzle 26 jets the coolant in an in-plane direction perpendicular to a rotation shaft 19 of the chamfering grindstone 18. Furthermore, the nozzle 26 is installed at a position where the nozzle 26 jets the coolant in a tangential direction of a peripheral part of the chamfering grindstone 18.

Description

  The present invention relates to a processing apparatus and a processing method for a plate-like object.

  Glass plates (plates) for FPD (Flat Panel Display) used in liquid crystal displays, plasma displays, etc., are formed by forming molten glass into plates and then cutting them into glass plates of a predetermined rectangular size using a cutting device. Is done. Thereafter, the glass plate is chamfered by grinding the edge thereof with a chamfering grindstone of a chamfering device (processing device). As a chamfering device, it is known as in Patent Document 1.

  The chamfering device described in Patent Document 2 includes a chamfering grindstone, a coolant (grinding fluid) injection nozzle, and the like. The chamfering grindstone is rotated around an axis parallel to an axis perpendicular to the plane of the glass plate, and the rotation direction is set to a direction opposite to the conveyance direction of the glass plate in the grinding portion of the glass plate. ing. Moreover, the outer peripheral surface used as the grinding surface of the chamfering grindstone is substantially concave and has an arcuate cross-sectional contour shape, and the edge of the glass plate is ground into an arcuate cross-sectional shape.

  On the other hand, the coolant injection nozzle is configured to inject coolant toward the contact portion from the upstream side in the rotation direction of the chamfering grindstone with reference to the contact portion between the glass plate and the chamfering grindstone. ing.

  In addition, a pair of coolant (coolant) injection nozzles described in Patent Document 3 are disposed on both sides of the workpiece, and are disposed obliquely above the contact portion between the workpiece and the grindstone, and the contact Coolant is sprayed from an oblique direction toward the portion and the vicinity thereof. That is, the processing apparatus of Patent Document 3 includes two coolant injection nozzles.

JP 2002-160147 A JP 2009-172749 A JP 2007-30051 A

  However, in the conventional chamfering device, the coolant spray nozzle is not installed at the optimal position, so the coolant sprayed from the coolant spray nozzle is not sprayed to the optimal position, and the glass plate after grinding is not Burning and chipping occurred at the edge, causing cracks in the glass plate and inhibiting productivity.

  Particularly, in a chamfering grindstone rotating at a high speed of 5000 rpm or more, a thick air layer is formed along the outer peripheral surface of the rotating chamfering grindstone. In the coolant injection device including the coolant injection nozzle, the coolant injection pressure and the injection amount for penetrating the air layer are set, but the coolant injection nozzle is not installed at the optimum position. Has the problem that the injection pressure and the injection amount become unnecessarily large, and the load of the coolant injection device becomes large.

  This invention is made | formed in view of such a situation, and it aims at providing the processing apparatus and processing method of a plate-shaped object provided with the injection means which injects a cooling liquid to the optimal position.

  In order to achieve the above object, the present invention provides a surface plate for holding a plate-like object, and a disk-like or columnar surface for chamfering by grinding an edge of the plate-like object held by the surface plate. A chamfering grindstone, a rotating means for rotating the chamfering grindstone, and a peripheral surface of the chamfering grindstone contacting a grinding surface of an outer peripheral surface of the plate-like object, or the chamfering grindstone or the plate shape A moving means for moving the object along the edge of the plate-like object, and spraying a coolant on the contact portion between the grinding surface of the chamfering grindstone and the edge of the plate-like object, and There is provided an apparatus for processing a plate-like object, comprising: an injection unit that injects the cooling liquid in an in-plane direction orthogonal to a rotation axis of the chamfering grindstone.

  In order to achieve the above object, the present invention presses the grinding surface of a rotating disk-shaped or columnar chamfering grindstone against the edge of the plate-shaped body, and the plate-shaped body and the chamfering grindstone Is moved relatively along the edge of the plate-like body, and a coolant is sprayed onto the contact portion between the grinding surface of the chamfering grindstone and the edge of the plate-like object. Thus, in the plate-like body processing method for chamfering the edge of the plate-like body, the coolant is jetted in an in-plane direction perpendicular to the rotation axis of the chamfering grindstone. Provided is a method for processing a plate-like product.

  According to the present invention, the coolant is injected to the contact portion between the grinding surface of the chamfering grindstone and the edge of the plate-like object, and the in-plane direction orthogonal to the rotation axis of the chamfering grindstone is An injection means was installed at a position for injecting the coolant. Thereby, since the coolant is sprayed to the optimum position, the edge portion of the plate-like object can be well chamfered by the chamfering grindstone, and the coolant spray amount can be reduced. Further, since the present invention injects the cooling liquid to the optimum position using one injection means, the amount of cooling water used is compared with the apparatus of Patent Document 3 using two cooling liquid injection nozzles. Can be reduced. In addition, when a plate-shaped object is a glass plate, generation | occurrence | production of the burning and chipping which arise in the edge part of a glass plate can be reduced.

  It is preferable that the injection means of the present invention injects the cooling liquid in a tangential direction of the grinding surface of the chamfering grindstone.

  According to the present invention, the coolant can be sprayed to the optimum position without applying a rotational load to the chamfering grindstone by the spray pressure of the coolant.

  The chamfering grindstone of the present invention is a disk or columnar shape in which the shape of the grinding surface of the chamfering grindstone is flat, and when the edge of the plate-like object is contacted, the contact pressure Accordingly, it is preferable that the cross-sectional shape of the chamfering grindstone is elastically deformed into a concave shape along the shape of the edge portion.

  The chamfering grindstone of the present invention is not a grooved chamfering grindstone in which an annular groove (grinding surface) is formed on the outer peripheral surface thereof, but the outer peripheral surface is flat and the edge of the plate-like object is in contact Then, the chamfering grindstone whose cross-sectional shape in the thickness direction of the chamfering grindstone is elastically deformed into a concave shape along the shape of the edge portion by contact pressure. In this case, the position of the injection means may be set so that the cooling liquid is injected to the bottom of the elastically deformed recess.

  According to the present invention, since the chamfering grindstone contacts the boundary surface between the end surface of the plate-like object and the main surface among the edge portions of the plate-like object, the boundary surface can be smoothly ground. In the case where the plate-like object is a glass plate, minute chipping (chips) generated on the boundary surface can be reduced.

  The chamfering grindstone of the present invention preferably includes one or a plurality of annular grooves on the outer peripheral surface.

  According to the plate-like material processing apparatus of the present invention, the coolant can be sprayed to an optimum position, so that the edge portion of the plate-like material can be well chamfered by the chamfering grindstone, and the coolant is sprayed. The amount can be reduced.

The top view of the chamfering apparatus to which the processing apparatus of the plate-shaped object of this invention was applied The perspective view which showed the arrangement position of the grindstone for grinding, a glass plate, and a nozzle Explanatory drawing in which the groove of the chamfering grindstone is placed opposite to the edge of the glass plate Explanatory drawing in which the edge part of the glass plate is ground by the groove of the chamfering grindstone Explanatory drawing of the edge part of the glass plate chamfered by grinding Explanatory drawing which looked at the arrangement position shown in FIG. 2 from the side Explanatory drawing which looked at the arrangement position shown in FIG. 2 from the upper surface Overall perspective view showing another chamfering grindstone Explanatory drawing in which the grinding surface of the chamfering grindstone in FIG. 5 is disposed opposite to the edge of the glass plate. Explanatory drawing in which the edge part of a glass plate is ground with the grindstone for chamfering of FIG. Explanatory drawing of the edge part of the glass plate chamfered with the grindstone for chamfering of FIG. Side view in which edge of glass plate is ground by chamfering grindstone in FIG.

  Hereinafter, preferred embodiments of a processing apparatus and a processing method for a plate-like object according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a plan view of a chamfering apparatus 10 according to an embodiment to which a processing apparatus for a plate-like object of the present invention is applied. This chamfering device 10 is a device that chamfers an edge portion of a glass plate (plate-like object) 12 having a thickness of 0.7 mm or less. In addition, the plate-like object applicable to the processing apparatus of the present invention is not limited to the glass plate for a liquid crystal display, but is a glass plate for an FPD such as a glass plate for a plasma display or a glass plate for an LED display, a building material or a mirror. The present invention may be applied to a general glass plate, metal plate, or resin plate. Further, the thickness of the plate-like material is not limited to 0.7 mm or less, and may be a thickness exceeding 0.7 mm.

  The chamfering apparatus 10 grinds the edge of the glass plate 12, a surface plate 14 that sucks and holds the rectangular glass plate 12, a moving device (moving means) 16 that reciprocates the surface plate 14 in the direction of arrows AB. A pair of chamfering grindstones 18 and 20 that are processed and chamfered, motors (rotating means) 22 and 24 that rotate chamfering grindstones 18 and 20 at high speed, and nozzles that inject coolant (injection) Means) 26, 28 and the like.

  The chamfering apparatus 10 according to the embodiment holds the main surface of the glass plate 12 on the mounting surface of the surface plate 14 and moves the surface plate 14 in the direction of arrow A by the moving device 16 while moving the glass plate during the movement. The 12 opposing edge portions 12A and 12B are ground by chamfering grindstones 18 and 20 that are rotating (spinning) in a direction facing the moving direction of the glass plate 12. Thereby, the edge portions 12A and 12B of the glass plate 12 are chamfered. Further, at the time of the grinding process, the coolant is sprayed from the nozzle 26 to the contact portion between the chamfering grindstone 18 and the edge portion 12 </ b> A of the glass plate 12, and the chamfering grindstone 20 and the edge of the glass plate 12. Cooling liquid is sprayed from the nozzle 28 to the contact portion with the portion 12B. Thereby, since the said contact location is cooled with the said cooling liquid, generation | occurrence | production of the burning, chipping, etc. which arise in the edge part 12A of the glass plate 12 is reduced, and the end surface ground with the said main surface of the glass plate 12 Chipping that occurs at the boundary between and is reduced. The nozzles 26 and 28 will be described later.

  The material of the coolant is not particularly limited, and may be pure water, grinding oil, or a mixture thereof.

  In the chamfering device 10, a chamfering grindstone 18 is disposed to face the edge portion 12 </ b> A in order to chamfer a pair of opposite edge portions 12 </ b> A and 12 </ b> B of the glass plate 12 at the same time. 20 is arranged to face the edge 12B.

  In FIG. 1, the chamfering grindstone 18 is rotated counterclockwise by the motor 22, and the chamfering grindstone 20 is rotated clockwise by the motor 24. Further, the rotational speed of the chamfering grindstones 18 and 20 is set to 5000 rpm or more.

  In addition, although the figure shows the chamfering device 10 that grinds the edge portions 12A and 12B with the fixed chamfering grindstones 18 and 20 while moving the glass plate 12 in the direction of arrow A, The chamfering device that fixes the glass plate 12 and moves the chamfering grindstones 18 and 20 along the edge portions 12A and 12B of the glass plate 12 may be used. A chamfering device that moves both the grindstones 18 and 20 along the edge portions 12A and 12B of the glass plate 12 toward each other may be used. Further, the other opposing edge portions 12C and 12D of the glass plate 12 may be ground by a pair of chamfering grindstones (not shown) arranged at the rear stage of the chamfering grindstones 18 and 20 in FIG. . Alternatively, the glass plate 12 is moved in the B direction by the surface plate 14 to return to the original position, and then the glass plate 12 is moved by the surface plate 14 to 90 degrees with the perpendicular in the main surface direction of the glass plate 12 as an axis. After the rotation, the edge portions 12C and 12D may be ground by the chamfering grindstones 18 and 20 whose intervals are changed while the glass plate 12 is moved in the A direction by the surface plate 14.

  The chamfering grindstones 18 and 20 are arranged to face the end face 12E of the glass plate 12 as shown in FIG. Here, the end surface 12E is a surface in a direction orthogonal to the main surface 12F of the glass plate 12, and is a surface before chamfering. The boundary portion between the end surface 12E and the main surface 12F and the portion including the end surface 12E are referred to as end edge portions 12A to 12D, and the end edge portions 12A to 12D are ground by the chamfering grindstones 18 and 20. In addition, as described in Patent Document 1, the rotation axes of the chamfering grindstones 18 and 20 may be inclined at a predetermined angle with respect to a vertical line standing on the main surface of the glass plate 12.

  The chamfering grindstones 18 and 20 are simultaneously driven to rotate, and the opposing edge portions 12A and 12B of the glass plate 12 are simultaneously ground by the chamfering grindstones 18 and 20 by the movement of the glass plate 12 by the moving device 16 of FIG. Processed.

  3A and 3B are enlarged cross-sectional views of main parts of the outer peripheral surfaces 30 and 32 of the chamfering grindstones 18 and 20, respectively. Since the chamfering grindstones 18 and 20 have the same configuration, the chamfering grindstone 18 will be described here, and the description of the chamfering grindstone 20 will be omitted.

  On the outer peripheral surface 30 of the chamfering grindstone 18, a plurality of annular grooves 34 that are grinding surfaces are formed in the horizontal direction, and a plurality of annular grooves 34 are provided in parallel in the vertical direction as shown in the side view of FIG. 4A. ing. The cross-sectional shape in the thickness direction of the chamfering grindstone 18 of the annular groove 34 is not limited to the U shape shown in FIGS. 3A and 3B, and may be a V shape or a concave shape. Although the number of the annular grooves 34 may be one, it is preferable to provide a plurality of the annular grooves 34 as shown in FIG. 4A in order to eliminate the replacement work of the chamfering grindstone 18. Since a plurality of the annular grooves 34 are provided in the chamfering grindstone 18, the chamfering grindstone 18 is moved up and down by the pitch unit of the annular groove 34 by a control device (not shown) when the annular groove 34 in use reaches the end of its life. If the chamfering grindstone 18 is raised and lowered in the direction (thickness direction of the chamfering grindstone 18), the chamfering grindstone 18 can be chamfered without replacement. The shape of the annular groove 34 may be a shape having a single radius of curvature, and includes a portion where the end surface 12E is ground and a boundary surface 12G between the end surface 12E ′ and the main surface 12F which has been ground as shown in FIG. 3C. The part to be ground may have a shape having different radii of curvature.

  As shown in FIG. 3A, the edge 12A of the glass plate 12 is opposed to the annular groove 34, and as shown in FIG. 3B, the chamfering grindstone 18 is fed toward the edge 12A by the grinding allowance. The annular groove 34 of the chamfering grindstone 18 is pressed and brought into contact with the end edge portion 12A. Thereby, as shown in FIG. 3C, the end edge portion 12 </ b> A is ground by the annular groove 34. As shown by a broken line in FIG. 3A, the chamfering grindstone 18 is fed toward the end edge 12A so that the center portion of the end surface 12E in the thickness direction of the glass plate 12 is in contact with the deepest portion of the annular groove 34. It is done.

  As the chamfering grindstones 18 and 20, a metal bond grindstone in which abrasive grains are held with a metal binder such as iron, copper, cobalt, or brass, or abrasive grains are held with a thermosetting resin binder. Examples thereof include a resin bond grindstone, a vitrified bond grindstone in which abrasive grains are held with a porcelain binder such as glass, and an electrodeposited grindstone in which a plating layer is formed on a pedestal surface of the grindstone, and the abrasive grains are fixed to the plating layer.

Examples of the abrasive grains arranged in the binder include diamond, silicon carbide (SiC), and alumina (Al ₂ O ₃ ).

  FIG. 5 is an overall perspective view showing another chamfering grindstone 40, and FIGS. 6A to 6C are explanatory views of grinding of the glass plate 12 by the chamfering grindstone 40 of FIG.

  The chamfering grindstone 40 shown in the figure is a chamfering grindstone having a disk shape or a columnar shape and a substantially flat grinding surface 42 on the outer peripheral surface. Further, the grinding surface 42 of the chamfering grindstone 40 is disposed opposite to the edge portion 12A of the glass plate 12 as shown in FIG. 6A, and the edge portion 12A of the glass plate 12 is ground surface 42 as shown in FIG. 6B. The elastic body made of rubber or the like whose cross-sectional shape in the thickness direction of the chamfering grindstone 40 is elastically deformed into a concave shape along the shape of the end edge portion 12A due to the contact pressure.

  According to this chamfering grindstone 40, when the edge portions 12A to 12D of the glass plate 12 come into contact with the flat grinding surface 42 of the chamfering grindstone 40, the grinding surface 42 has the contour shape of the edge portions 12A to 12D. It is recessed into a substantially matching concave shape. At this time, pressure due to contact concentrates on the boundary portions 12G and 12G between the end surface 12E and the main surface 12F of the glass plate 12, so that the boundary portions 12G and 12G are ground more than the other portions, and the glass plate 12 The edge portion 12A is ground as shown in FIG. 6C.

  FIG. 7 is a side view in which the edge portion 12A of the glass plate 12 is ground by the chamfering grindstone 40 of FIG. As shown in FIG. 7, the upper and lower edge portions 46, 46 of the concave portion 44 of the grinding surface 42 of the chamfering grindstone 40 that is pushed and expanded by the end edge portion 12 </ b> A of the glass plate 12 are the upper and lower boundary portions 12 </ b> G, Since the boundary portions 12G and 12G are in contact with 12G at a low pressure, the boundary portions 12G and 12G are smoothly ground by the edge portions 46 and 46, and the occurrence of chipping at the boundary portions 12G and 12G is reduced.

The chamfering grindstone 40 is configured by dispersing abrasive grains in an elastic body. Examples of the elastic body include butyl rubber, silicone, polyurethane, and natural rubber. Examples of the abrasive grains include diamond, alumina (Al ₂ O ₃ ), silicon carbide (SiC), pumice, and garnet.

  Next, the nozzles 26 and 28 according to the embodiment will be described with reference to FIGS. 2 and 4A and 4B. Since the nozzles 26 and 28 are the same member and the concept of the arrangement position is the same, the nozzle 26 will be described here, and the description of the nozzle 28 will be omitted.

  As described above, the nozzle 26 is recessed on the grinding surface of the chamfering grindstone 18 (the same applies to the chamfering grindstone 40) (in the case of the chamfering grindstone 18, the annular groove 34, and in the case of the chamfering grindstone 40). The chamfering grindstone 18 (40) as shown in FIG. 2 is a position P2 upstream of the chamfering grindstone 18 in the rotational direction with respect to the contact position P1 between the concave portion 44) and the edge 12A of the glass plate 12. It is installed in the position which injects a cooling liquid toward the position P2 (FIG. 4B) from the position of the upstream of the rotation direction. Further, the position P2 is such that the diameter d of the annular groove 34 of the chamfering grindstone 18 and the ratio x / d of the distance x between the contact position P1 and the position P2 are 0.04 (4%) to 0.05 (5%). ) (0.04 (4%) ≦ x / d ≦ 0.05 (5%)).

  Moreover, the nozzle 26 is installed in the position which injects a cooling liquid in the in-plane direction orthogonal to the rotating shaft 19 of the grindstone 18 for chamfering like FIG. 4A. That is, the nozzle 26 according to the embodiment injects the cooling liquid toward the position P2 in a direction parallel to the in-plane direction of the main surface F of the glass plate 12 as indicated by an arrow C in FIG. 4B.

  As a result, according to the nozzle 26 of the embodiment, an air layer in which the coolant is formed along the optimum position of the chamfering grindstone 18 (40), that is, along the outer peripheral surface of the rotating chamfering grindstone 18. Therefore, the chamfering grindstone 18 (40) can chamfer the edge 12A of the glass plate 12 satisfactorily, and the amount of coolant injected can be reduced. In addition, being able to chamfer well means that it is possible to reduce the occurrence of burning and chipping at the edge portion 12A of the glass plate 12 and to reduce chipping generated at the boundary surface 12G. In addition, the distance from the chamfering grindstone 18 (40) to the injection port of the nozzle 26 (28) is not particularly limited, and may be a distance close to each other so as not to contact each other. Since the coolant sprayed from the nozzle 26 (28) installed at the distance is instantaneously supplied to the position P2 along with the rotation of the chamfering grindstone 18 (40), the glass plate 12 is favorably ground. Will not cause any problems.

  Moreover, it is preferable that the nozzle 26 is installed in the position which injects a cooling fluid in the tangential direction of the said grinding surface (annular groove 34, recessed part 44) of the grindstone 18 (40) for chamfering like FIG. 4B. Thus, the coolant is sprayed to the optimum position of the chamfering grindstone 18 (40) without applying a rotational load to the chamfering grindstone 18 (40) by the spraying pressure of the coolant sprayed from the nozzle 26. Can do. In the embodiment, since the coolant is sprayed to the optimum position using the single nozzle 26 (28), compared with the apparatus of Patent Document 3 using two coolant spray nozzles, The amount of cooling water used can be reduced.

  A preferable condition for allowing the coolant injected from the nozzle 26 to penetrate the air layer formed on the outer peripheral surface of the chamfering grindstone 18 (40) during high-speed rotation is that the diameter of the injection port of the nozzle 26 is 2. ~ 3mm, the distance from the position P2 to the injection port of the nozzle 26 is 10 ~ 20mm, the flow rate of the coolant is 10 ~ 20m / sec, and the chamfering speed by the chamfering grindstone 18 (40) (the chamfering of the glass plate 12) The relative speed with respect to the grinding wheels 18 and 20 for use is preferably 12 m / min. By performing chamfering under such conditions, the coolant can be penetrated through the air layer, and the supply amount of the coolant can be reduced to 3 to 5 L / min.

  The object to be processed by the plate-like material processing apparatus of the present invention is not limited to a glass plate for FPD such as a liquid crystal display that requires high chamfering accuracy, and may be a general glass plate for building materials or mirrors. Moreover, it is not limited to a glass plate, A metal-made or resin-made plate-shaped object may be sufficient.

  DESCRIPTION OF SYMBOLS 10 ... Chamfering device, 12 ... Glass plate, 12A-12D ... End edge part, 12E ... End surface, 12E '... End surface, 12F ... Main surface, 12G ... Boundary surface, 14 ... Surface plate, 16 ... Moving device, 18, DESCRIPTION OF SYMBOLS 20 ... Chamfering wheel, 19 ... Rotating shaft, 22, 24 ... Motor, 26, 28 ... Nozzle, 30, 32 ... Outer peripheral surface, 40 ... Chamfering grindstone, 42 ... Grinding surface, 44 ... Recess, 46 ... Edge Part

Claims (5)

A surface plate for holding a plate-like object;
A disc-shaped or column-shaped chamfering grindstone for grinding and chamfering the edge of the plate-like object held by the surface plate;
Rotating means for rotating the chamfering grindstone,
Moving the chamfering grindstone or the plate-like object along the edge of the plate-like object by bringing the peripheral part of the chamfering grindstone into contact with the grinding surface of the outer peripheral surface of the plate-like object Means,
The coolant is sprayed to a contact portion between the grinding surface of the chamfering grindstone and the edge of the plate-like object, and the coolant is in an in-plane direction orthogonal to the rotation axis of the chamfering grindstone. Injection means for injecting
An apparatus for processing a plate-like object.   The plate-like object processing apparatus according to claim 1, wherein the injection unit injects the cooling liquid in a tangential direction of the grinding surface of the chamfering grindstone.   The chamfering grindstone has a disk shape or a columnar shape in which the shape of the peripheral portion of the chamfering grindstone is flat, and when the grinding surface of the plate-like object is contacted, the end is caused by contact pressure. The processing apparatus for a plate-like object according to claim 1 or 2, wherein the chamfering grindstone is an elastic body whose cross-sectional shape in the thickness direction is elastically deformed into a concave shape along an edge shape.   The said chamfering grindstone is a processing apparatus of the plate-shaped object of Claim 1 or 2 provided with the 1 or several annular groove in the said outer peripheral surface. While pressing the grinding surface of the rotating disk-shaped or column-shaped chamfering grindstone against the edge of the plate-like body, the plate-like body and the chamfering grindstone are pressed against the edge of the plate-like body. The edge of the plate-like body is moved by spraying a cooling liquid onto the contact portion between the grinding surface of the chamfering grindstone and the edge of the plate-like object while relatively moving along the chamfering grindstone. In the processing method of the plate-like body to be chamfered,
A processing method for a plate-like object, wherein the cooling liquid is sprayed in an in-plane direction orthogonal to a rotation axis of the chamfering grindstone.

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