JP4313285B2 - Edge processing device for plate workpiece - Google Patents

Description

  The present invention relates to an apparatus for grinding a side edge (side or edge) of a plate-like workpiece, and in particular, chamfering and edge finishing of a hard brittle plate such as a glass substrate or a ceramic plate for a display panel. The present invention relates to the above apparatus particularly suitable for machining and other shaping processes.

Sharp edges for cutting the sides of the glass substrate other hard and brittle plate (edge) is formed, in order to prevent the chipping or cracking is generated from this portion, and to prevent the risk of when handling these members Further, a shaping process such as a process of smoothing the cut surface or a chamfering process of a ridge is performed.

  This type of shaping is usually performed by relatively moving the rotating grindstone along the edge of the workpiece to be machined. However, as shown in FIG. A grindstone unit 3u, 3d provided with a plurality of disc grindstones 7 (7a, 7b...) Rotating around a grindstone axis 6 parallel to or substantially parallel to the marginal edge 4 of the workpiece 1 to be worked. The structure which arrange | positions is proposed. In this structure, as shown in FIG. 5, the outer peripheral surfaces of the upper and lower grindstones 7 come into contact with the upper and lower edges of the edge 4 of the workpiece, respectively, and chamfering the edges is performed. Arrow R is the direction of rotation of the grindstone 7 during processing.

Further, Patent Document 1 proposes a technique in which the outer peripheral surface of each disc grindstone is a conical peripheral surface having a small diameter on the workpiece entry side in the edge processing apparatus provided with the plurality of disc grindstones. There has been proposed an edge processing apparatus in which the inclination angle of the conical circumferential surface with respect to the shaft center is set to a larger inclination angle (steep slope) as the disc grindstone is closer to the workpiece.
JP 2002-346890 A

  When chamfering a hard brittle plate such as a glass substrate for a display panel in the grinding apparatus described in Patent Document 1, in order to improve the processing efficiency, if the relative feed speed of the workpiece to the disk grindstone is increased, the processing surface It was recognized that the waviness considered to be due to the uncut portion was generated, and it was necessary to suppress the processing speed to about 6 m / min or less in order not to generate waviness on the processed surface.

  The present invention enables the processing of the edge of a hard brittle plate at a higher speed without causing a decrease in surface accuracy such as waviness on the processed surface, thereby allowing the workpiece edge to be processed on the outer peripheral surface of the grindstone. It is an object to improve the processing efficiency of the edge processing apparatus that performs the above processing.

The present invention, in the disk grinder 7 which rotates in the relative feed direction Y and the flat line grindstone shaft 6 around for the grinder 7 of the workpiece edge 4 to be machined, a conical peripheral surface 10 of the workpiece entering side has a small diameter, the In the edge processing apparatus for a plate-like workpiece that grinds the workpiece edge, a parallel contact peripheral surface 11 that comes into contact with the peripheral edge of the conical peripheral surface 10 of the disc grindstone contacts the peripheral edge in parallel with the relative feed direction Y. By providing the above, the above-mentioned problem is solved.

  The edge processing apparatus having the above structure arranges a plurality of disk grindstones 7 at intervals in the axial direction of the grindstone shaft 6, and the outer peripheral surface of the plurality of disk grindstones 7. By sequentially cutting deeply into 4, the processing speed, particularly the processing speed for a hard brittle plate can be improved.

As means for sequentially cutting a plurality of disc grindstones 7..., The edge 4 for machining the disc grindstones 7... Which are successively increased in diameter toward the workpiece withdrawal side (downstream side in the relative feed direction of the workpiece). feeding direction Y and rotating the parallel to the grinding wheel axis 6 around. In the case of this structure, parallel contact peripheral surface exact cylindrical surface and ing.

The processing speed can be increased as the width of the parallel contact peripheral surface 11 (length in the grinding wheel axis direction) is increased. Parallel contact peripheral surface when provided with a plurality of disk grinder 7 ... the grinding wheel spindle 6 11 have preferred to dispose the all disc grinder 7 .... The cutting amount of the final stage grindstone 7d into the workpiece 1 is desirably smaller than the cutting amount of the preceding stage grindstone, and is preferably at least one half or less, preferably about 4 to 1/5. It is effective to obtain a smoother and more accurate machined surface.

The edge processing apparatus for a plate-like workpiece according to the invention of claim 1 of the present application includes a grinding wheel shaft parallel to the relative feed direction of the workpiece, and three or more sheets that rotate around the grinding wheel shaft and grind the edge of the workpiece. An edge processing apparatus for a plate-like workpiece, comprising a disc grinding wheel, wherein the three or more disc grinding stones are arranged at an interval in the axial direction of the grinding wheel shaft and are gradually increased in diameter toward the workpiece withdrawal side. in all of the outer peripheral surface of the disc grindstone, a conical peripheral surface 10 of the entry side of the workpiece with a small diameter, and the relative feed direction of the continuously connected without work having a step on the workpiece exit side of the conical peripheral surface And a parallel contact peripheral surface 11 that contacts the edge of the workpiece in parallel, the conical peripheral surface (10) is located on the work entry side of each disc grindstone, and the parallel contact peripheral surface (11) is each disc. Located on the workpiece exit side of the grindstone, the diameter difference between adjacent disc grindstones is the workpiece advance It is large enough between the side of the disc grindstone, and in which the apex angle of the cone of the conical peripheral surface corresponding to the diameter difference is characterized in that it is larger as a disk grinding wheel of a workpiece entry side.

Edge processing apparatus of the plate-shaped workpiece according to the present invention of claim 2 is the edge machining device plate workpiece having the above means, a disc adjacent disc grindstone work exit end and in the work entrance side The difference in diameter with the grindstone is ½ or less of the difference in diameter between two adjacent disc grindstones located on the workpiece entry side with respect to the disc grindstone on the workpiece withdrawal side end.

  According to the present invention, the processing speed of the edge of the hard brittle plate by the outer peripheral surface of the disc grindstone 7 can be increased without causing a decrease in the processing surface accuracy such as the generation of waviness. As a specific example, four disk grindstones 7 are used, and a parallel contact circumferential surface 11 of 1 to 2 mm is provided on the workpiece withdrawal side of each disc grindstone outer circumferential surface, and the cutting amount of the second-stage disc grindstone 7b (Radial difference with respect to the previous stage disc wheel) 140 microns and the cut amount of the third stage disc grindstone 7c to 100 microns, the cut amount of the disc grindstone 7d on the fourth step surface (work withdrawal side end) is 20 microns. In the glass substrate chamfering apparatus, when the parallel contact peripheral surface 11 is provided, grinding processing without waviness of 14 m / min is possible with respect to the processing speed 6 m / min when the parallel contact peripheral surface 11 is not provided. there were.

  FIG. 1 is a diagram schematically showing the shape of the outer peripheral surface of the disk grindstone 7... In the chamfering apparatus for a glass substrate shown in FIGS. 4 and 5, and FIG. 2 is a conventional structure in comparison with FIG. It is the figure which showed the outer periphery shape of the disk grindstone in. In the figure, 6 is a rotating grindstone shaft, 7 is a disc grindstone fixed to the rotating grindstone shaft 6, 1 is a workpiece (glass substrate), 4 is the edge of the workpiece to be processed, and Y is the relative feed direction of the workpiece.

  In the conventional structure shown in FIG. 2, the outer peripheral surface of the disk grindstone 7 is a conical peripheral surface 10 having a small diameter in the workpiece entry direction. On the other hand, the outer peripheral surface of the disc grindstone 7 in the edge processing apparatus of the present invention is in contact with the conical peripheral surface 10 having a small diameter on the workpiece entry side and the edge 4 being processed in parallel with the workpiece feed direction Y. The conical circumferential surface 10 is located on the entry side of the workpiece 1, and the parallel contact circumferential surface 11 is located on the withdrawal side of the workpiece 1. In the example of FIG. 1, the grindstone shaft 6 is parallel to the workpiece feed direction Y, and therefore the parallel contact peripheral surface 11 is a cylindrical surface.

  The disc grindstone 7 in the edge processing apparatus of the present invention includes a parallel contact peripheral surface 11 that contacts the processed peripheral edge 4 in parallel to the downstream side of the conical peripheral surface 10 cut into the work in the workpiece feed direction. The processed surface after the parallel contact peripheral surface 11 is cut by the conical peripheral surface 10 is smoothed.

  In the conventional structure of FIG. 2, when the relative feed speed of the workpiece is increased, waviness occurs on the machining surface 12. However, according to the structure of the present invention of FIG. Thus, a highly accurate processed surface 12 can be obtained.

  As shown in FIG. 3, the edge processing apparatus having a preferable structure in which a plurality of disk grinding wheels 7... Are mounted on the rotary grinding wheel shaft 6 at intervals in the axial direction includes a conical circumferential surface 10 on the workpiece entry side. , And four disc grindstones 7 provided with the parallel contact peripheral surface 11 on the workpiece withdrawal side of the conical peripheral surface. The grindstone shaft 6 is parallel to the workpiece feed direction Y, and the disc grindstone on the workpiece entry side has a larger radius difference from the disc grindstone adjacent to the subsequent stage. Correspondingly, the inclination angle of the conical circumferential surface 10 with respect to the grindstone shaft 6 The (cone apex angle) is also larger at the workpiece entry side. The cutting amount of the final stage disc whetstone 7d is one fifth of that of the previous stage, and the main action is that the three front stage disc whetstones 7a to 7c cut into the workpiece and work. The stepped disc grindstone 7d focuses on the action of smoothing the processed surface after being processed.

  By using the disk grindstone shown in FIGS. 1 and 3 in the chamfering apparatus for the glass substrate or other hard brittle plate having the structure shown in FIGS. 4 and 5, the surface system of the machined surface is not lowered. The relative feed speed of the workpiece with respect to the grindstone, that is, the processing speed of the workpiece can be dramatically improved.

The figure which shows the shape of the outer peripheral surface of the disk grindstone in the edge processing apparatus of this invention The figure which shows the shape of the outer peripheral surface of the disk grindstone in the conventional edge processing apparatus The figure which shows the structure which provided the disk grindstone of FIG. 1 with two or more on the same grindstone axis | shaft, and its processing aspect The perspective view which shows the relationship between the grindstone and the workpiece | work of the chamfering processing apparatus of the glass substrate provided with the some disk grindstone. The enlarged front view of the principal part of FIG.

Explanation of symbols

10 Conical surface
11 Parallel contact surface

Claims (2)

A grindstone shaft parallel to the relative feed direction of the workpiece, and three or more disc grindstones that rotate around the grindstone shaft and grind the edges of the workpiece, the three or more disc grindstones are arranged on the grindstone shaft. In the edge processing apparatus for plate-like workpieces that are arranged at intervals in the axial direction and that are sequentially increased in diameter toward the workpiece withdrawal side,
All the outer peripheral surfaces of the disk grindstone are conical circumferential surface (10) having a small diameter on the workpiece entry side, and the workpiece is connected to the workpiece withdrawal side without a step on the relative circumferential direction of the workpiece. A parallel contact peripheral surface (11) that contacts the edge of the workpiece in parallel, the conical peripheral surface (10) is located on the workpiece entry side of each disk grindstone, the parallel contact peripheral surface (11) is Located on the workpiece exit side of each disc grindstone, the difference in diameter between adjacent disc grindstones is increased between the disc grindstones on the workpiece entry side, and the apex angle of the cone on the conical circumferential surface corresponding to this diameter difference An edge processing apparatus for a plate-shaped workpiece, wherein the disk grinding wheel on the workpiece entry side is made larger . Diameter difference of the disc grindstone work exit end with a disc grindstone adjacent to the work entrance side, of the diameter difference between the two adjacent disk grindstone positioned from the disc grindstone of the workpiece exit end to the work entrance side The edge processing apparatus for a plate-like workpiece according to claim 1, wherein the edge processing apparatus is 1/2 or less.

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