JP3040905B2 - Double grinding wheel, glass plate edge grinding / polishing method and glass plate edge grinding / polishing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel suitable for grinding or polishing the edge of a glass plate, especially a thick glass plate, and a method of grinding and polishing the edge of a glass plate using the grinding wheel. And equipment.

[0002]

2. Description of the Related Art As is well known, for example, when a glass plate is used as a table top plate or the like, the edges of the glass plate are chamfered and polished. Conventionally, in such chamfering and polishing, in order to finish the edge of the glass plate into a curved surface having an arc-shaped cross section, a grinding wheel 3 as illustrated in FIG.
00 was used. The grinding wheel 300 is provided with a rotating abrasive surface 302 having a substantially semicircular cross section. The rotating grinding surface 302 is brought into contact with an edge 306 of the glass plate 304 and is rotated. 306 was ground or polished to form an arc-shaped curved surface.

[0003]

However, FIG.
As shown in (b), in the vicinity of the outer edge of the rotary grinding surface 302 (indicated by A in the figure), the direction of the force pressing the grinding wheel 300 against the glass plate 304 (arrow B), the direction of the surface of the rotary grinding surface 302 and The ground / polished surface of the edge 306 of the glass plate 304 was almost parallel. For this reason, a force in the direction of pressing the rotary abrasive surface 302 hardly acts on the surface to be ground / polished in this vicinity, and good grinding / polishing could not be performed. In addition, the rotating / grinding surface 302 is
Is applied along the axial direction of the grinding wheel 300, the grinding and grinding near the outer edge of the rotating grinding surface 302 is performed.
Although it can be polished, a step is generated near the boundary between the surface 304a of the glass plate 304 and the edge 306. Therefore, the conventional glass plate 30
As shown in FIG. 10A, the edge portion 306 of No. 4 had to be formed into an arc-shaped curved surface having a cross section less than a semicircle, as shown in FIG.

[0004]

Means for Solving the Problems As means for solving the above problems, a dual grinding wheel according to a first aspect of the present invention comprises
Formed along one edge of a generally disk-shaped base that rotates around
On the formed rotary grinding surface, a frustum-shaped side surface first grinding surface,
The second grinding wheel having a rotating arc-shaped portion connected to the large diameter side of the first grinding surface
A pair of grinding wheels provided with a surface
Substantially coaxially connected to each other on the side opposite to the formed edge
It is characterized by the following.

[0005] Further, the edge of the glass plate of the second invention can be ground.
The polishing method uses the double grinding wheel of the first invention.
From one side of the glass plate,
Grind the edge of the glass plate in the range corresponding to the thickness or
A method of polishing, wherein the two stations are arranged on one surface.
Maintain the above pair while maintaining the tilt angle of the rotating shaft of the
Touch one of the rotating surfaces of the grinding wheel to the edge of the glass plate.
Touch and rotate the grinding wheel to remove the edge of the glass plate
The point is to grind or polish .

[0006] Finally, edge grinding and polishing apparatus for a glass plate of the third aspect of the present invention, in edge grinding and polishing apparatus for a glass plate for grinding or polishing the edge portion of the glass plate, the first origination
It is characterized by being equipped with a light twin wheel .

[0007]

In the dual grinding wheel according to the first aspect of the present invention, the rotary grinding surface includes a frustoconical first side grinding surface and a rotating arc-shaped portion connected to the large-diameter side of the first grinding surface. And a second abrasive surface having the same. Here, the rotating arc shape is a shape corresponding to a side surface of a rotating body formed when the arc is rotated around a central axis located outside the circle, assuming a circle including the arc. Say. Therefore, the cross-sectional shape of the rotating arc-shaped portion along the radius of the rotating body is an arc.

In using this double-type grinding wheel,
Is the edge of the glass plate at one of the paired grinding wheels
If the upper half is ground or polished, the other wheel
Grinding or polishing the other half of the. At this time, the inclination angle of the rotating shaft of the grinding wheel with respect to one surface of the glass plate is maintained at an obtuse angle corresponding to substantially (90 ° + the angle between the first grinding surface and the rotating shaft) and the rotating grinding surface of the grinding wheel is maintained. Abut on the edge of the glass plate. At this time, a part of the second abrasive surface is projected on one surface side of the glass plate, and the first abrasive surface is located on the other surface side of the glass plate. It is preferable that the grinding wheel is in a rotating state prior to the contact.

When the double wheel is rotated while pressing one of the grinding wheels against the edge of the glass plate along the radial direction, the edge of the glass plate has a shape corresponding to the shape of the rotating grinding surface. Ground or polished. Since the rotating grinding surface is in contact with the edge of the glass plate at an angle corresponding to the inclination angle of the rotating shaft of the grinding wheel, the force pressing the second grinding surface toward the surface to be ground or the surface to be polished is Also, it works effectively in the vicinity of the boundary between one surface of the glass plate and the edge, and good grinding and polishing can be performed. Therefore, if a rotating arc-shaped portion corresponding to, for example, a 円 circle is provided on the second grinding surface, the edge of the glass plate is moved from one surface of the glass plate toward the other surface by approximately 1 °. /
It can be ground or polished into an arc shape corresponding to four circles. Thereafter, if the other surface is similarly ground or polished, an arc-shaped ground or polished surface corresponding to a quarter circle can be obtained from both surfaces of the glass plate. If the radius of the arc-shaped portion of the second grinding surface is set to approximately １ ／ of the thickness of the glass plate, the edge portion of the glass plate can be ground or polished in a semicircular shape by the two operations as described above. Note that the inclination angle of the rotation axis of the grinding wheel with respect to one surface of the glass plate is substantially (90 degrees + first angle).
Since the angle is maintained at an obtuse angle corresponding to the angle between the grinding surface and the rotation axis, the portion of the glass plate that is in contact with the first grinding surface is not excessively ground or polished.

As described above, the use of the double-type grinding wheel of the first invention makes it possible to grind and polish in an arc shape also near the boundary between one surface of the glass plate and the edge, and the cross section is reduced. A substantially semi-circular ground or polished surface can be obtained. Only
Also, one of the pair of grinding wheels can perform the first grinding or polishing out of the above-described two grindings or polishing, and the other grinding wheel can perform the second grinding or polishing. When polishing, reversing the direction of the double grinding wheel and / or
There is no need to replace both grinding wheels . Therefore, the efficiency of the grinding or polishing operation is improved.

According to the glass plate edge grinding / polishing method of the second invention , the same effects as described above can be realized.
Furthermore, the same effect as described above can be realized in the apparatus for grinding and polishing the edge of a glass sheet according to the third invention .

[0012]

Next, embodiments of the present invention will be described. As shown in FIG. 1, two series-type grinding wheel 10 of this example, was ligated with an upper grinding wheel 12 and a lower grinding wheel 14 together back side structure
At the center of the upper grinding wheel 12, a chuck shaft 16 to be attached to an apparatus using the dual grinding wheel 10 is fixed. The upper grinding wheel 12, the lower grinding wheel 14, and the chuck shaft 16 are substantially concentric with each other.

The upper grinding wheel 12 has a disk-shaped metal core member 18 to which a chuck shaft 16 is fixed, and a metal member 18 fitted around and fixed to the core member 18 so as to surround the outer periphery of the core member 18. Ring member 20. A metal connecting member 22 having a through hole 22 a at the center is fastened and fixed to the ring member 20 via a plurality of bolts 24.

From the upper surface 20a of the ring member 20 to the outer peripheral surface 20b
The edge portion 20c of the ring member 20 is cut away, and a diamond grindstone 26 having a substantially arc-shaped cross section is fixed thereto. On the upper surface 20a side of the diamond grindstone 26, a truncated cone-shaped first grind surface 28 having an inclination angle of about 5 degrees is provided. The diamond wheel 26 has an approximately 1/4 arc formed on the upper grinding wheel 1 continuously from the first grinding surface 28.
Rotating arc-shaped portion 30a formed by rotating around the axis of No. 2
Is provided. An annular flat grinding surface portion 30b having a width w along a direction substantially perpendicular to the axis of the upper grinding wheel 12 is continuous with the outer periphery of the rotating arc-shaped portion 30a, and the rotating arc-shaped portion 30a and the flat grinding surface portion 30b Thus, the second abrasive surface 30 is formed. The first grinding surface 28 and the second grinding surface 30 are substantially concentric with the upper grinding wheel 12, and the two grinding surfaces 28 and 30 constitute a rotating grinding surface 32 of the diamond grinding stone 26.

On the other hand, the lower grinding wheel 14, which is connected to the upper grinding wheel 12 via a plurality of bolts 33 embedded in the connecting member 22, has a through hole 34a provided in the center and a through hole 34a. An annular groove 34b provided along the outer periphery
And a metal base 34 having: Through hole 34
a is substantially the same diameter and concentric as the through hole 22a of the connecting member 22, and the through hole 34a and the through hole 22a constitute a jig hole 35 in a series. The jig hole 35 is used for the grinding wheel 10
The jig hole 35 is provided for fitting the jig hole 35 into a cylindrical storage jig (not shown) when storing the jig.

An edge 34 on the lower surface 34c side of the base 34
d is cut out, and a diamond grindstone 36 is fixed to the cutout portion of this edge portion 34d similarly to the upper grinding wheel 12. Like the diamond grinding wheel 26 of the upper grinding wheel 12, the diamond grinding wheel 36 has a frusto-conical side surface shaped first grinding surface 38, and a substantially 1/4 arc is used for the lower grinding wheel 14
A second grinding surface 4 formed by a rotating arc-shaped portion 40a formed by rotating about the axis of the shaft and an annular flat grinding surface portion 40b having a width w.
0s are continuously provided. In addition, these first grinding surfaces 3
The second grinding surface 8 and the second grinding surface 40 are substantially concentric with the lower grinding wheel 14, and the two grinding surfaces 38 and 40 constitute a rotating grinding surface 42 of the diamond grinding stone 36.

Further, as shown in FIG. 2, 24 slits 44 are formed in the diamond grindstones 26 and 36 at regular intervals along the radial direction. These slits 44 are used when the grinding wheel 10 is used for grinding or polishing.
It becomes a passage for cooling water. As shown in FIG. 3, this grinding wheel 1
0 using a glass plate edge grinding and polishing device (hereinafter, referred to as
Four support columns 54 (only one is shown) for mounting the glass plate G are erected on the surface plate 52 of the grinding / polishing device 50). A suction cup (not shown) is provided at the upper end of each of the support columns 54, and can suck and hold the glass plate G. The grinding and polishing apparatus 50 includes a gate-shaped frame (not shown) that reciprocates horizontally on the surface plate 52 along the Y axis. A traverser (not shown) that reciprocates horizontally along the X axis is mounted on the frame. The traverser has a vertical arm 56 that can reciprocate along a vertical Z axis and can rotate around a vertical C axis.
The vertical arm 56 is provided with a swing arm 58 that can swing about an A-axis in a horizontal direction orthogonal to the C-axis. The grinding wheel 10 is attached to the tip of the swing arm 58 via a chuck (not shown) and can be removed. The swing arm 58 is provided with a grindstone motor (not shown) for driving the grindstone wheel 10 to rotate. Therefore, the position of the grinding wheel 10 attached to the tip of the swing arm 58 can be changed in the horizontal direction (X axis, Y axis), the vertical direction (Z axis),
Horizontal plane rotation (around C axis) and vertical plane rotation (around A axis)
And the grindstone 10 can be rotationally driven.

The grinding and polishing apparatus 50 includes a control unit 60 for controlling the position and the attitude of the grinding wheel 10 with respect to the five axes. This control unit 6
Numeral 0 incorporates a well-known microcomputer having a CPU, a RAM, a ROM, an A / D converter, etc., and executes various processes in accordance with programs stored in advance and instructions input through an input panel (not shown). A device that is possible and is known as an NC control device. The control unit 60 includes a Y-axis drive circuit 6 for operating and stopping a Y-axis motor (not shown) for horizontally moving the frame.
2. An X-axis drive circuit 64 for operating and stopping an X-axis motor (not shown) for horizontally moving the traverser, and a Z-axis for operating and stopping a Z-axis motor (not shown) for vertically moving the vertical arm 56. A drive circuit 66, a C-axis drive circuit 68 for operating and stopping a C-axis motor (not shown) for rotating the vertical arm 56, and an A-axis motor (not shown) for swinging the swing arm 58 are operated and An A-axis drive circuit 70 for stopping and a grindstone drive circuit 72 for operating and stopping the grindstone motor are connected.
Can control the operation of these drive circuits 62 to 72. Therefore, the driving circuit 6 is controlled by the control unit 60.
By controlling 2 to 72, it is possible to control the position and orientation of the grinding wheel 10 with respect to five axes and control the rotation of the grinding wheel 10.

Next, a case where the above-described grinding and polishing apparatus 50 performs the grinding and polishing of the edge portion of the glass sheet G will be described. First, work data is input to the control unit 60 prior to the grinding / polishing work. As shown in FIG. 4, various operation data is input to the control unit 60 via the operation panel (step 1000). The work data input here is data relating to the base material of the glass sheet G and the geometrical shape (for example, a rectangle, square, circle, ellipse, etc.) at the time of finishing, dimensions, setting of the grinding or polishing step, and the like. is there. In the setting of the process, the type of processing such as chamfering and polishing, the shape of the edge after processing, processing steps such as one-time polishing and two-time polishing, and selection of a grinding wheel to be used in each processing step are input. You. Grinding of one glass plate G
When the operation data necessary for the polishing operation is input, the control unit 60 stores the operation data and ends the input mode.

When the operator instructs the start of the operation after the input mode ends, the control unit 60 starts the execution mode shown in FIG. In this execution mode, the control unit 60 reads the input work data and controls the drive circuits 62 to 72 to perform the grinding / polishing work according to the data, and also performs processing according to the program ( Step 2000).

In this operation, the edge 90 of the glass plate G is
Is polished to a curved surface with a half-arc cross section.
This will be described with reference to FIG. As shown in FIG. 6, in a process prior to the ４５ arc polishing, the edge 90 of the glass sheet G is subjected to 45-degree grinding, and is inclined by 45 degrees with respect to the upper surface 92 a and the lower surface 92 b of the glass plate G. Upper and lower bevels 90a and 90b are formed (see FIG. 6B).

First, the upper bevel 90a side of the glass plate G in the state shown in FIG. 6B is polished into a substantially 1/4 arc shape.
In the polishing, the rotating grinding surface 42 of the lower grinding wheel 14 of the grinding wheel 10 is adjusted with the upper bevel 90 a of the edge portion 90 while the grinding wheel 10 mounted on the grinding and polishing apparatus 50 is rotated.
Abut the upper half including. At this time, the grinding and polishing device 50
Each of the drive circuits 62 to 72 includes a grinding wheel 10 (the lower grinding wheel 1).
The control unit 60 controls the rotation axis O of 4) to incline by about 5 degrees with respect to the vertical axis V, and press the rotary grinding surface 42 against the edge 90.

As shown in FIG. 7, the grinding wheel 10 (the lower grinding wheel 14) revolves around the glass sheet G along the edge 90 of the glass sheet G while rotating (arrow R1) (arrow R2). And
Edge portion 90 of glass plate G ahead of revolution direction on rotating abrasive surface 42
Grinding and polishing. At this time, the grinding wheel 10 (the lower grinding wheel 14) is controlled so as to move toward the center of the glass sheet G at a constant ratio as it proceeds in the direction of the arrow R2 in order to cope with the wear of the rotary grinding surface 42. You. Accordingly, the locus of the center of the grinding wheel 10 (the lower grinding wheel 14) is not a perfect circle but a gentle spiral. The broken line in the drawing is the outline of the edge portion 90 expected after grinding and polishing.

FIG. 6A is a partial cross-sectional view taken along the line PP in FIG. 7, and as shown in FIG.
The rotating arc-shaped portion 40a of the second grinding surface 40 is almost in close contact with the upper half of the edge 90 of the glass plate G, and the flat grinding surface portion 40b projects above the upper surface 92a of the glass plate G. Further, in a portion in contact with the edge portion 90, the first abrasive surface 38 is substantially perpendicular to the upper and lower surfaces 92a and 92b of the glass plate G.
Glass plate G of rotation axis O of grinding wheel 10 (lower grinding wheel 14)
Is inclined at an obtuse angle (about 95 degrees) with respect to the upper surface 92a.
A force for pressing the rotating abrasive surface 42 toward the polished surface side of the edge portion 90 effectively acts. Therefore, the edge 90 of the glass sheet G can be reliably ground and polished even in the vicinity B of the boundary. Further, since the flat abrasive surface portion 40b protrudes toward the upper surface 92a of the glass plate G, there is no step at the boundary between the upper surface 92a of the glass plate G and the edge portion 90.

As described above, the upper surface 92a of the glass plate G
If the edge 90 of the side is ground and polished to a curved surface having a substantially 1/4 arc-shaped cross section, and the lower surface 92b side is also ground and polished in the same manner, the edge 90 will be substantially ほ ぼ circle in cross section. It can be finished into an arcuate curved surface. In grinding and polishing the lower surface 92b, the upper grinding wheel 12 is used, and its rotation axis is inclined by about 5 degrees to the opposite side to the above-described case.

Further, after the grinding and polishing as described above, if the finish polishing is performed in the same procedure as described above using a grinding wheel for finish polishing, the edge portion of the glass plate becomes a more favorable polished surface. be able to. Although the embodiment has been described above,
The present invention is not limited to such an embodiment,
Various implementations can be made without departing from the gist of the present invention.

The double-type grinding wheel of the above embodiment is constructed as described above.
Use a pair of grinding wheels with the same rotating grinding surface
However, as shown in FIG.
02, 104, upper grinding wheel 106, lower grinding wheel 1
08 may be used as a pair to form a double-type grinding wheel 110.
If such a grinding wheel 110 is used, the curvatures (r
An arc-shaped curved surface 116 including two portions 112 and 114 having different positions (1, r2) can be obtained. Further, as shown in FIG. 9, an edge portion 128 having a flat portion 126 between a quarter-arc portion 122 on the upper surface side and a quarter-arc portion 124 on the lower surface side may be used. (FIG. 9
(A)) At this time, the curvatures (r4, r5) of the upper and lower arc-shaped portions 132, 134 can be made different (FIG. 9).
(B)).

Although a diamond grindstone is used in the above embodiment, the present invention is not limited to a diamond grindstone, and other abrasives can be used. Note that the inclination angle of the first abrasive surface is not limited to the above-mentioned 5 degrees. If the inclination angle is 10 degrees or less , grinding / polishing without practical problems can be realized, but it is preferably 7 degrees or less. Further, in the above embodiment, a ridge line is formed at a connection portion between the first grinding surface and the second grinding surface, but it is not necessary to do so. For example, the first grinding surface is formed along a tangent line of the second grinding surface. It can also be formed. Furthermore, the flat abrasive surface does not necessarily need to be formed, and it is sufficient that a part of the second abrasive surface protrudes above the surface of the glass plate during grinding and polishing.

[0029]

As described above, the two stations of the first invention are described.
If a mold grinding wheel is used, it is possible to grind and polish in an arc shape even near the boundary between one surface and the edge of the glass plate, and it is possible to obtain a substantially semicircular ground surface or polished surface . In addition, one of the pair of grinding wheels can perform the above two grinding operations.
Or the first grinding or polishing of polishing and the other grinding
The stone wheel can be used for the second grinding or polishing.
When grinding or polishing, the direction of the grinding wheel is
No need to replace. Because of this, the efficiency of grinding or polishing work
Will be better.

[0030]

Further, according to the method for grinding and polishing an edge portion of a glass sheet of the second invention , the same effect as described above can be realized.
Furthermore, the same effect as described above can be realized in the apparatus for grinding and polishing the edge of a glass sheet according to the third invention .

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of a grinding wheel according to an embodiment.

FIG. 2 is a partially enlarged view of the vicinity of a slit of the grinding wheel according to the embodiment.

FIG. 3 is an explanatory diagram of an outline of an apparatus for grinding and polishing an edge portion of a glass plate according to an embodiment.

FIG. 4 is a flowchart of an input mode in a control unit of the apparatus for grinding and polishing an edge portion of a glass sheet according to the embodiment.

FIG. 5 is a flowchart of an execution mode in a control unit of the apparatus for grinding and polishing an edge portion of a glass sheet according to the embodiment.

FIG. 6 is an explanatory view of an edge portion of a glass plate to be ground and polished by the edge portion grinding and polishing apparatus of the glass plate according to the embodiment;
(A) is a partial cross-sectional view showing a contact state between the edge portion and the rotating grind surface, FIG. 6 (b) is a cross-sectional view of the edge portion in a state of 45 ° grinding, and FIG. It is sectional drawing of the edge part in the state grind | polished to the curved surface of two circular arcs.

FIG. 7 is an explanatory view of a relative position between a glass plate and a grinding wheel when grinding and polishing the edge of the glass plate by the apparatus for grinding and polishing the edge of the glass plate of the embodiment.

8A and 8B are explanatory views of a modified example of the grinding wheel according to the embodiment. FIG. 8A is a partial sectional view of the grinding wheel, and FIG. 8B is a sectional view of an edge portion polished by the grinding wheel. It is.

9A and 9B are explanatory views of a working example using a grinding wheel according to the present invention. FIG. 9A is a partial cross-sectional view of an example in which a quarter-arc portion having the same curvature is formed, and FIG. FIG. 4 is a partial cross-sectional view of an example in which a curvature 1/4 arc-shaped portion is formed.

10 (a) and 10 (b) are explanatory views of a conventional technique, in which FIG. 10 (a) is an explanatory view of a machining example of less than a half arc and FIG. 10 (b) is an explanatory view of a problem of the conventional technique.

[Explanation of symbols]

10 ... grinding wheel, 12 ... upper grinding wheel, 14 ...
Lower grinding wheel, 18: core member (base), 20: ring member (base), 20c: edge portion (edge), 28 ...
-1st grinding surface, 30 ... 2nd grinding surface, 30a ... rotating arc-shaped part, 30b ... flat grinding surface part, 32 ... rotating grinding surface,
34 · · · base, 34 d · · · edge (edge), 38 ·
..First abrasive surface, 40... Second abrasive surface, 40a... Rotating arc-shaped portion, 40b... Flat abrasive surface, 40b. ... Grinding and polishing equipment, 5
Reference numeral 6: vertical arm, 58: swing arm, 60: control unit (control means), 90: edge portion, 92a ...
Upper surface (one surface), 92b... Lower surface (one surface), G
... glass plate, O ... rotary shaft.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B24D 7/18 B24B 9/10

Claims (7)

(57) [Claims] 1. A substantially disk-shaped base rotating around a rotation axis.
On the rotating grinding surface formed along one edge of
First side grinding surface, and rotation continuing to the large diameter side of the first grinding surface
A grinding wheel provided with a second grinding surface having an arc-shaped portion
The pair is mutually opposite on the side opposite to the edge on which the rotating abrasive surface is formed.
A double grinding wheel characterized by being connected substantially coaxially. 2. The double grinding wheel according to claim 1, wherein the angle between the first grinding surface and the rotation axis is 10 degrees or less.
Car . 3. The method according to claim 1, wherein the second grinding surface has a rotating arc shape formed by rotating a substantially 1/4 arc around a rotation axis.
Two-wheel grinding wheel . 4. A 2 according to any one of claims 1 to 3, characterized in that a flat abrasive surface of the annular to said second abrasive surface
Continuous grinding wheel . 5. A double station according to claim 1, wherein :
Using a type grinding wheel, a predetermined area from one side of the glass plate
A method of grinding or polishing an edge of the surrounding glass plate.
Thus, the inclination of the rotation axis of the double grinding wheel with respect to the one surface.
One of the rotating wheels of the paired grinding wheel while maintaining the angle at an obtuse angle
Rotate the grinding wheel with the surface in contact with the edge of the glass plate
Glass to grind or polish the edge of the glass plate
Grinding and polishing method for the edge of a steel plate. 6. An edge portion of a glass plate is ground or polished.
An apparatus for grinding and polishing an edge portion of a glass plate, wherein the dual grinding wheel according to any one of claims 1 to 4 is mounted.
Edge grinding / polishing equipment for glass sheets
Place. 7. An X-axis and a Y-axis of the twin-type grinding wheel.
Horizontal displacement, vertical displacement along the Z axis, C
Rotational displacement along the horizontal plane around the axis and the A axis
5-axis control of rotational displacement along the vertical plane as the center
7. A control means according to claim 6, wherein
Equipment for grinding and polishing the edges of glass plates.