JP3334817B2 - Polishing method of glass plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for polishing a surface of a glass plate.

[0002]

2. Description of the Related Art Conventionally, as a method of polishing a glass plate of this kind, a method of revolving a plurality of polishing disks while rotating them has been adopted in many cases. FIG. 3 is an explanatory plan view of a conventional polishing method. FIG. 3 (2) shows the center of rotation of the polishing disk (1).
(3) indicates the center of revolution.

[0003]

In the conventional polishing method,
In order to avoid mutual interference between a plurality of polishing disks, a non-polishing region (4) is generated at the center of the revolution, and the outer peripheral locus of the polishing disk remains on the surface of the glass plate in this portion, and the flatness of the polishing surface ,
There was a disadvantage that the flatness was poor.

An object of the present invention is to provide a method for uniformly polishing a glass plate which requires a high degree of flatness and flatness for a liquid crystal or the like as compared with the conventional polishing method.

[Means for Solving the Problems]

In order to achieve the above object, one aspect of the present invention is a method of polishing a glass plate in which a plurality of polishing disks revolve while rotating by a planetary rotating mechanism. Eccentrically mounted from the center,
In addition, the polishing is performed by eccentric rotation so that the polishing disk passes through the center of revolution.

Another aspect of the present invention is a method of polishing a glass plate in which a plurality of polishing plates are revolved while rotating by a planetary rotating mechanism. The polishing plate is made elliptical or rectangular, and the center of rotation is rotated by the planetary rotating mechanism. It is mounted so that it is aligned with the center, and is polished by rotating so that the polishing plate passes through the center of revolution.

[0007]

According to the first method of the present invention, the center of the plurality of polishing disks is eccentric from the rotation center of the planetary rotation mechanism, and the eccentric rotation is performed so that the polishing disk passes through the center of revolution. It is possible to prevent the non-polishing area from being generated at the center of the revolution while avoiding mutual interference between the polishing disks.

In a second method of the present invention, a plurality of planetary rotating polishing plates are formed into an elliptical or rectangular shape, the center of rotation of which is aligned with the center of rotation of the planetary rotation mechanism, and the polishing plate is set at the center of revolution. Since it is rotated so as to pass through, it is possible to prevent a non-polishing region from being generated at the center of the revolution while avoiding mutual interference between the plurality of polishing plates.

[0009]

1 (A) and 1 (B) are a plan explanatory view of a polishing method according to a first invention and a longitudinal sectional side view showing an embodiment of a polishing head. A plurality (three in the figure) of polishing circles are shown. In a method for polishing a glass plate in which a plate (5) is revolved while being rotated by a planetary rotation mechanism (6), the center of the polishing disk (5) is mounted eccentrically from the rotation center (7) of the planetary rotation mechanism, and The polishing disk (5) is eccentrically rotated so as to pass through the center of revolution (8) to polish the glass plate (9).

The planetary rotation mechanism (6) includes a revolving shaft (6a) rotatably supported by a polishing head (not shown).
, The rotation axes (6b) are arranged concentrically at intervals of 120 degrees via a substrate (6c) and a bearing cylinder (6d), and each rotation axis (6b) rotates in the same direction at the same speed, The revolving shaft (6a) is revolved in the same direction as the rotating shaft (6b) or in the opposite direction.

A polishing disk (5) is mounted on each of the rotation shafts (6b) so as to be eccentric to the relative phases shown in FIGS. 1 (A) and 1 (B). On the polishing surface of this polishing disk (5),
A polishing tool (5a) such as a polishing felt or a polishing buff is attached. A balance weight (6e) is attached to each rotation shaft (6b), and each polishing disc (5)
The generation of the shaft vibration due to the eccentric rotation of the shaft is offset. During the polishing of the glass plate (9), the polishing head
The reciprocating unit such as a cylinder can reciprocate in a direction indicated by an arrow (x) in FIG. The glass plate (9) is movable in the direction shown by the arrow (y) in FIG.

According to the polishing method of the first aspect of the present invention, each polishing disk (5) is drawn by drawing a rotation trajectory as shown in FIG.
Revolve while rotating without interfering with each other, and each polishing disk (5) passes through the center of revolution (8), so that a non-polishing area does not occur near the center of revolution (8), and the glass plate (9)
Can be polished uniformly. In addition, the glass plate (9)
At the time of polishing, an abrasive obtained by mixing cerium oxide, red iron oxide or the like having an appropriate particle diameter into water or other liquid is applied between the surface of the glass plate (9) and the polishing tool (5a) of the polishing disk (5). Supply. The supply of the abrasive is performed via any one of the center hole of each rotation shaft (6b), the center hole of the revolution shaft (6a), and an external nozzle.

Next, FIGS. 2A and 2B are a plan explanatory view of a polishing method according to a second invention and a longitudinal sectional side view showing an embodiment of a polishing head, wherein a plurality (two in the figure) are shown. Polishing plate (5 ')
Into an elliptical shape, the rotation center of which is aligned with the rotation center (7) of the planetary rotation mechanism (6), and the polishing plate (5 ') passes through the revolution center (8) of the planetary rotation mechanism (6). Then, the glass plate (9) is polished by being rotated.

The planetary rotation mechanism (6) includes a revolving shaft (6a) rotatably supported by a polishing head (not shown).
, The rotation axes (6b) are arranged concentrically at 180 ° intervals via a substrate (6c) and a bearing cylinder (6d), and each rotation axis (6b) is at the same speed in the same direction or the opposite direction. It rotates, and the revolving shaft (6a) is revolved in the same direction as the revolving shaft (6b) or in the opposite direction.

Each of the rotating shafts (6b) is provided with a polishing plate (5 ') having a relational phase (9) shown in FIGS. 2A and 2B.
(0 degree phase difference). A polishing tool (5) such as a polishing felt or a polishing buff is provided on the polishing surface of the polishing plate (5 ').
a ′). The polishing head is
While the glass plate (9) is being polished, the glass plate (9) can reciprocate in a direction indicated by an arrow (x) in FIG. The glass plate (9) is movable in the direction shown by the arrow (y) in FIG.

According to the polishing method of the second aspect of the present invention, each polishing plate (5 ') is drawn by drawing a rotational trajectory as shown in FIG.
Revolve while rotating without interfering with each other, and each polishing plate (5 ') passes through the center of revolution (8), so that a non-polishing area does not occur near the center of revolution (8), and the glass plate (9)
Can be polished uniformly. In addition, the glass plate (9)
The polishing is performed by supplying an appropriate abrasive.

The second invention provides an elliptical polishing plate (5 ').
However, the same effect can be obtained by using a rectangular polishing plate instead.

Further, the embodiments of the first invention and the second invention are as follows.
The case where the polishing head (not shown) and the glass plate (9) are reciprocated and moved has been described as an example, but it is also possible to carry out the operation with any one fixed.

[0019]

According to the first aspect of the present invention, the centers of the plurality of polishing disks are mounted eccentrically from the rotation center of the planetary rotation mechanism, and the polishing disks are eccentrically rotated so as to pass through the center of revolution. Therefore, it is possible to prevent a non-polishing area from being generated at the center of the revolution while avoiding mutual interference between a plurality of polishing disks, and to ensure uniformity, no trace of the maximum outer periphery, high-precision flatness,
A glass sheet product requiring flatness can be provided.

According to the second aspect of the present invention, the plurality of planetary rotating polishing plates are formed into elliptical or rectangular shapes, the rotation centers of which are aligned with the rotation centers of the planetary rotation mechanism, and the polishing plates are arranged so that the center of revolution is the center. Rotated so that it passes through, it is possible to prevent the occurrence of non-polishing areas at the center of revolution while avoiding mutual interference between multiple polishing plates, uniform, no trace of maximum outer circumference remains, and high-precision flatness A glass sheet product requiring flatness can be provided.

[Brief description of the drawings]

FIG. 1A is an explanatory plan view of a polishing method according to a first invention,
(B) is a side view showing an embodiment of the polishing head, and the left half shows a cross section.

FIG. 2A is an explanatory plan view of a polishing method according to a second invention,
(B) is a side view showing an embodiment of the polishing head, and the left half shows a cross section.

FIG. 3 is an explanatory plan view of a conventional polishing method.

[Explanation of symbols]

 5 Polishing disk 5 'Polishing plate 6 Planetary rotation mechanism 7 Center of rotation 8 Center of revolution 9 Glass plate

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Claims (2)

(57) [Claims] 1. A polishing method for a glass plate in which a plurality of polishing disks are revolved while rotating by a planetary rotating mechanism, wherein the center of the polishing disk is mounted eccentrically from the rotation center of the planetary rotating mechanism, and the polishing disk is mounted. A glass plate being eccentrically rotated so as to pass through a center of revolution. 2. A polishing method for a glass plate in which a plurality of polishing plates are revolved while rotating by a planetary rotation mechanism, wherein the polishing plate is made elliptical or rectangular, and the rotation center thereof is aligned with the rotation center of the planetary rotation mechanism. And polishing the glass plate by rotating the polishing plate so as to pass through the center of revolution.