JP6263036B2 - Edge grinding wheel and chamfering device - Google Patents

Description

  The present invention relates to a grindstone for processing the peripheral edge of a glass plate or other hard brittle plate and a chamfering device for performing chamfering using the grindstone, and in particular, a glass plate or other hard brittleness having a curved plate surface. The present invention relates to the above grindstone and apparatus suitable for processing the periphery of a plate (hereinafter referred to as “3D panel”).

  A general method of cutting a glass plate is to use the brittleness of the glass. A scribe groove (scratching groove) is formed on the surface of the glass plate with a diamond pointed needle or a roller, and a small amount generated along the scribe groove. This is to cut a vertical crack that is promoted by heat or impact force. A rough ridgeline or a sharp ridgeline due to cracking is formed on the periphery of the glass plate cut by such a method. Therefore, it is necessary to chamfer this ridge line portion to prevent the operator's finger from being damaged or to prevent the ridge line from being chipped or cracked.

  Conventionally, this chamfering is a grindstone called a multi grindstone with a plurality of disc grindstones rotating around an axis substantially parallel to the ridgeline to be chamfered, and a circumferential groove according to the cross-sectional shape of the processed glass plate periphery. It is performed using a grindstone called a general-purpose grindstone having

  FIG. 6 is a partially enlarged view of a conventional general-purpose grindstone 30 and a glass plate w chamfered by the grindstone. The general-purpose grindstone 30 includes a circumferential groove 70 formed by a cylindrical grindstone surface 6 and upper and lower conical grindstone surfaces 8, 9, and an end surface u of the glass plate is ground by the cylindrical grindstone surface 6 and is chamfered by upper and lower chamfers. The surfaces s and t are ground with conical whetstone surfaces 8 and 9, respectively. Conventionally, the chamfering angles (tilt angles) θ of the chamfered surfaces s and t with respect to the surface of the glass plate are generally 45 degrees, but the chamfering angle becomes smaller as the glass plate becomes thinner (for example, θ = 15 degrees to 35 degrees).

  Recently, 3D (three-dimensional) panels have been developed in display panels, their cover glasses, reflecting mirrors, and the like. In other words, a glass plate having a curved surface is used in order to display a three-dimensional image and to obtain a reflection surface corresponding to the unevenness of the projection surface (surface corresponding to the screen) of the image. Even in a 3D panel having such a curved plate surface, the peripheral edge must be chamfered in order to remove the above-described chipping and chipping.

  As described above, the conventional chamfering process of the glass plate is performed by moving the total shape grindstone or the multi grindstone along the periphery of the work to be machined. The rotation center axis of the general-purpose grindstone is perpendicular to the glass plate surface, and the rotation center axis of the multi-grinding stone is parallel to the plate surface of the glass plate. Since the outer periphery of the workpiece is on a two-dimensional plane, it can be processed by moving the grindstone relatively along the periphery of the workpiece in the XY plane in the rectangular coordinate system or the θ-r plane in the polar coordinate system.

  On the other hand, in the peripheral processing of the 3D panel, it is necessary to move the grindstone relative to the workpiece in a two-dimensional plane and also in the Z direction orthogonal to the two-dimensional plane. The control of the position of the grinding wheel in the Z direction can be easily performed by providing a lifting device that moves the grinding wheel in the direction of the rotation center axis, and controlling this lifting device with an NC device that reads the CAD data of the 3D panel. is there.

  However, the chamfering process using the general-purpose grindstone is performed by a circumferential groove provided on the outer periphery of the grindstone, and the circumferential groove rotates in a two-dimensional plane orthogonal to the rotation center of the grindstone. In the portion where the outer periphery of the 3D panel changes in the Z-axis direction, the extending direction of the periphery of the 3D panel and the tangential direction of the grindstone intersect each other. The circumferential groove of the conventional general-purpose grindstone is a trapezoidal cross-section groove, and the inclined surface (conical surface) used for chamfering as the glass plate becomes thinner is the aforementioned θ = 15 ° to 35 °. It is at a shallow angle. For this reason, if the extending direction of the peripheral edge of the workpiece to be chamfered deviates from the tangential direction of the grindstone circumferential groove, the grindstone is deeply cut into the workpiece and the machining shape is disturbed. In order to avoid this, it is necessary to incline the rotation center axis of the grindstone so that the extending direction of the workpiece periphery and the tangential direction of the circumferential groove of the grindstone are parallel to each other, but the mechanical structure and control become extremely complicated.

  It is an object of the present invention to enable chamfering of the periphery of a 3D panel without performing control of tilting the rotation axis of the grindstone. Further, the same machine performs cutting and chamfering of the outer periphery of the 3D panel. It is an object to provide an apparatus that can be performed on a table.

  The peripheral processing grindstone of the plate material according to the present invention is such that the grindstone surfaces 4 (4a, 4b) and 5 (5a, 5b) for grinding the chamfered surfaces s and t are spherical, and the spherical grindstone surfaces 4 and 5 are arranged to face each other. It is characterized by. Here, the spherical grindstone surfaces 4 and 5 include surfaces such as a sphere and a spheroid, and the center is a surface equivalent to a sphere or sphere on the rotation center axis of the grindstone, and faces the workpiece over the entire surface. It is a grindstone surface that is convex. Therefore, the chamfered surfaces s and t of the 3D panel w chamfered with the grindstone of the present invention are curved in a concave shape. Such an internally concave chamfer is also performed in conventional chamfering using a multi-grinding stone.

  If the grindstone 3 (3a, 3b) having the circumferential groove 7 in which the two spherical grindstone surfaces 4, 5 are opposed to each other with the cylindrical grindstone surface 6 sandwiched on the outer periphery of the grindstone is used, it is similar to the conventional general-purpose grindstone. The end face u of the 3D panel and the upper and lower chamfered surfaces s and t can be ground simultaneously.

  The surface in the relative feed direction of the grindstone parallel to the rotation center axis a of the grindstone, and the chamfered surfaces s and t of the spherical grindstone surfaces 4 and 5 and the edge p on the end surface side and the edge q on the plate surface side. As shown in FIG. 4, the intersecting lines e and f of the surfaces m and n and the spherical grindstone surfaces 4 and 5 become quadratic curves e and f close to a circle such as a circle or an ellipse, respectively, and the distance between both curves d is substantially constant.

  When the peripheral edge of the plate material w comes into contact with the spherical grindstone surfaces 4 and 5 obliquely, the contacts c4 and c5 between the plate material w and the spherical grindstone surface move back and forth in the relative movement direction of the plate material w and the grindstone 3. In the grindstone of the present invention in which the surfaces 4 and 5 are spherical, the amount of movement g of the contacts c4 and c5 is small, and the distance d between the curves e and f does not change even at the position after the movement. And the chamfer angle θ hardly change.

  On the other hand, in the conventional grindstone with the chamfering grindstone surface being a conical surface, the curves e and f are hyperbolic curves, and therefore, the chamfering width b and the chamfering angle θ at the portion where the peripheral edge of the 3D panel is inclined. Fluctuates greatly.

  When the upper and lower chamfered surfaces s and t are chamfered at the same time with the spherical grindstone surfaces facing each other, when the 3D panel w is inclined, the width of the end surface u becomes narrower. The chamfering processing of 3D panels, which are smaller than the conventional ones, is hardly a problem.

  The peripheral edge processing grindstone 3 of the plate material of the present invention having the above-described features is a grindstone in which two spherical grindstone surfaces 4 and 5 having the rotation center axis a as a central axis are arranged to face each other, more preferably two pieces. This is a grindstone provided with a cylindrical grindstone surface 6 connected to the inner diameter ends of the spherical grindstone surfaces 4 and 5.

  Further, the chamfering device of the present invention is a chamfering device that enables chamfering processing of the peripheral edge of the 3D panel using the above-described grindstone of the present invention, and is a vertical chamfering device that moves the grindstone up and down in the direction perpendicular to the surface of the workpiece. The chamfering apparatus includes a feed base 25 and includes a control unit that moves up and down in association with the movement of the grindstone along the edge of the 3D panel.

  A grindstone shaft 41 pivotally supported by the vertical feed table 25 and a second grindstone shaft 47 pivotally supported by a lifting table 28 that can be moved up and down on the vertical feed table are provided. 3D panel on the chamfering apparatus of the present invention by mounting the peripheral processing grindstone 3 of the present invention to the cylindrical cutting grindstone 45 whose peripheral surface is the grindstone surface at the lower end of the second grindstone shaft 47. It is possible to perform cutting and chamfering continuously.

  According to the grindstone of the present invention, in the chamfering of the periphery of the 3D panel, the grindstone shaft is moved up and down in accordance with the position of the 3D panel periphery in the Z direction without tilting the grindstone shaft according to the inclination of the panel periphery. With this control, chamfering that is uniform in appearance and substantially uniform can be performed.

  Further, by adding a control means for NC control of the axial movement of the grindstone shaft to a conventionally known chamfering device, there is an effect that a chamfering device capable of chamfering a 3D panel can be provided.

Side view of the first embodiment of the peripheral processing wheel Side view of the second embodiment of the peripheral processing wheel Partial enlarged view of the main part of the grindstone and processed plate material Explanatory drawing of chamfering action when the peripheral edge of the plate is inclined Schematic front view of chamfering device Partial enlarged view of the main part of a conventional grinding wheel and processed plate material

  FIG. 1 is a side view showing a first embodiment of a peripheral edge processing grindstone according to the present invention. FIG. 2 is a side view showing a second embodiment of the peripheral edge processing grindstone of the present invention. The peripheral processing grindstone 3a according to the first embodiment includes a hemispheric grindstone surface 4a, a ball grindstone surface 5a, and a cylindrical grindstone surface 6 between the spherical grindstone surfaces 4a and 5a facing each other. The peripheral edge processing grindstone 3b of the second embodiment includes a cylindrical grindstone surface 6 and two ball band grindstone surfaces 4b and 5b facing each other across the grindstone surface.

  The spherical grindstone surfaces 4 (4a, 4b) and 5 (5a, 5b) are perfectly convex curved surfaces whose intersection line with the plane orthogonal to the rotation center axis a of the grindstone is centered on the grindstone center axis a. The angle formed by the inner end of the spherical grinding wheel surfaces 4 and 5, that is, the generatrix of the spherical grinding wheel surfaces 4 and 5 at the position connected to the cylindrical grinding wheel surface 6 and the generatrix of the cylindrical grinding wheel surface (a line parallel to the rotation center axis) is 105 Degrees to 135 degrees.

  In FIG. 5 showing an embodiment of the chamfering apparatus of the present invention, reference numeral 1 denotes a main shaft. The main shaft 1 is a vertical hollow shaft and is rotatably supported by a bearing 11 fixed to the apparatus frame. A holder 12 is fixed to the upper end of the main shaft 1, and the upper surface 13 of the holder is a curved work holding surface corresponding to the surface of the glass plate w to be processed. The glass plate w conveyed on the holder 12 is vacuum-sucked and held, for example, by a negative pressure supplied through the hollow hole of the main shaft. A spindle motor (servo motor) 15 is connected to the lower end of the spindle 1. The spindle motor 15 is connected to the NC device 60 via a servo amplifier 61, and the rotation angle of the spindle 1 is controlled by a command from the NC device 60.

  Reference numeral 21 denotes a lateral feed base positioned above the main shaft 1. The lateral feed base 21 is movably guided by a horizontal lateral guide (not shown) provided on the apparatus frame, and is screwed into a lateral feed screw 24 that is rotationally driven by a lateral feed motor (servo motor) 23. ing. The lateral feed motor 23 is connected to the NC device 60 via a servo amplifier 62, and the moving position of the lateral feed base 21 is controlled by the NC device 60.

  Reference numeral 25 denotes a vertical feed stand. The vertical feed base 25 is movably mounted on a vertical guide (not shown) fixed in the horizontal feed base 21, that is, in a direction parallel to the main shaft 1, and is rotationally driven by a vertical feed motor (servo motor) 26. The vertical feed screw 27 is screwed. The vertical feed motor 26 is connected to the NC device 60 via a servo amplifier 63, and the moving position of the vertical feed base 21 is controlled by the NC device 60.

  Reference numeral 28 denotes a lifting platform. The lifting / lowering base 28 is slidably mounted on a vertical rail provided on the vertical feed base 25, and its upper end is connected to a rod of a lift cylinder 29 attached to the vertical feed base 25.

  3 (3a, 3b) is a peripheral processing grindstone. The peripheral processing grindstone 3 is attached to the lower end of the grindstone shaft 41 in the vertical direction, which is supported by the bearing 44 on the vertical feed base 25, and thus in the direction parallel to the main shaft 1. The upper end of the grindstone shaft 41 is connected to the grindstone motor 43 by a toothed belt 42.

  45 is a cutting grindstone. The cutting grindstone 45 is attached to the lower end of a vertical cutting grindstone shaft 47 that is directly connected to the rotor shaft of the brushless motor 46 attached to the elevator 28.

  The axis of the main shaft 1, the axis of the grindstone shaft 41, and the axis of the cutting grindstone shaft 47 are located on the same vertical plane parallel to the moving direction of the lateral feed base 21.

  When processing the workpiece with the peripheral processing grindstone 3, the lifting table 28 is raised by the lifting cylinder 29, and the cutting grindstone 45 is retracted to an upper position where it does not interfere with the workpiece w held by the holder 12. On the other hand, when cutting the workpiece w with the cutting grindstone 45, the lifting / lowering base 28 is lowered by the lifting / lowering cylinder 29, and the cutting whetstone 45 is lowered to the processing position by the vertical feed base 25 to cut the workpiece w. At this time, the peripheral processing grindstone 3 is retracted to an upper position where it does not interfere with the workpiece held by the holder 12 due to the relative elevation of the vertical feed base 25 with respect to the elevator base 28.

  In any of the processes, a desired planar shape is cut and a peripheral edge is processed by associating and controlling the movement position of the lateral feed base 21 and the rotation angle of the main shaft 1 in association with each other.

  The chamfering apparatus shown in FIG. 5 includes a cutting grindstone 45 and a peripheral processing grindstone 3. After the 3D panel carried in the holder 12 is cut into a predetermined shape by the cutting grindstone 45, the cutting grindstone 45 is moved upward. It is possible to chamfer the periphery of the 3D panel w after being retracted and cut by the periphery processing grindstone 3. In this case, the peripheral processing grindstone 3 may be a grindstone that does not include the cylindrical grindstone surface 6.

  If a grindstone having a cylindrical grindstone surface 6 is used as the peripheral processing grindstone 3, when the 3D panel cut into a predetermined shape in the previous process is loaded onto the holder 12, the end surface of the 3D panel is finished with the peripheral processing grindstone. Chamfering including grinding can be performed.

  Next, the operation of the chamfering apparatus when cutting and chamfering the 3D panel that has been carried in will be described. When the 3D panel w is carried into the holder 12 and fixed, the elevator 28 is lowered and the rotation of the spindle 1 and the rotation of the lateral feed motor 23 are synchronized by the NC device 60 so that the periphery of the 3D panel w has a predetermined shape. Disconnect.

  Next, the cutting grindstone 45 is retracted upward, and the rotation of the spindle 1 and the rotation of the lateral feed motor 23 are synchronously controlled by the NC device 60 according to the planar shape of the 3D panel w, and the portion to be ground on the holder 12 is controlled. The main shaft 1 is rotated once while the rotation angle of the main shaft 1 and the rotation of the vertical feed motor 26 are synchronously controlled by the NC device 60 according to the change in the height of the peripheral edge of the 3D panel. The chamfered surfaces s and t are processed simultaneously.

  At the time of grinding the chamfered surface, the end surface of the 3D panel edge can be finish-ground with the cylindrical grindstone surface 6 provided between the opposing spherical grindstone surfaces 4 and 5, and a rough grindstone is used as the cutting grindstone 45. It can be used to increase the cutting speed.

3 (3a, 3b) Grinding wheel 4 (4a, 4b) Spherical grinding wheel surface 5 (5a, 5b) Spherical grinding wheel surface 6 Cylindrical grinding wheel surface 7 Circumferential groove 21 Horizontal feed base 25 Vertical feed base 28 Lifting base 41 Grinding wheel shaft 45 Cutting grindstone 47 Second grinding wheel axis a Central axis of grinding wheel b Chamfering width c4, c5 Contact point between plate material and spherical grinding wheel surface d Interval between curves e and f e Line of intersection of spherical grinding wheel surface with e, f m, n g Movement amount m , N parallel to na, plane passing through p, q p end face side edge q plate face side edge s, t chamfered face u end face w plate material (3D panel)
θ Chamfer angle

Claims (4)

  A plate processing peripheral grinding wheel in which two spherical grinding wheel surfaces having a rotation central axis as a central axis are arranged to face each other.   The peripheral processing grindstone of Claim 1 provided with the cylindrical grindstone surface which connects the internal diameter end of two spherical grindstone surfaces. A grindstone relatively moves along the circumference of the workpiece while rotating around the axis of the plane perpendicular to the plane of the rectangular coordinate system or a polar coordinate system, the plate member having a longitudinal feed table for lifting the grinding wheel in the plane perpendicular in chamfering apparatus, the surface of which the longitudinal feed table of and a control means for Ru is raised and lowered according to the change in the height of the peripheral in association with the movement of the grinding wheel along the rim of the 3D panel as the workpiece, the plate material Taking device.   3. A grinding wheel shaft that is pivotally supported by the vertical feed table, and a second grinding wheel shaft that is pivotally supported by a lifting table that can be moved up and down on the feed table, and at the lower end of the grinding wheel shaft. A chamfering device according to claim 3, wherein a peripheral cutting grindstone is mounted, and a cylindrical cutting grindstone having a peripheral surface as a grindstone surface is mounted at a lower end of the second grindstone shaft.

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