KR100413031B1 - LCD glass grinding apparatus and grinding method using the same - Google Patents

Abstract

The present invention relates to an LCD glass polishing apparatus and a polishing method using the same, wherein a predetermined polishing pad 112 is attached to an entire upper surface and rotated in a predetermined direction by a motor 130 for rotation driving. ; An upper surface plate 210 which is operated by a separate turning drive motor 240 on the lower surface plate 110 to be rotated left and right by a predetermined angle and in close contact with the lower surface plate 110 to rotate together; An abrasive holder (400) (500) attached to the bottom of the upper surface (210) and having at least two or more placement portions (420) formed symmetrically by the partition portion (410) and sandwiching the LCD glass; It includes; a polishing liquid supply unit 300 for supplying a polishing liquid to the supply pipe 331 installed on the lower surface 110. The polishing method may further include attaching a polishing holder 400 having at least two arrangement portions 420 symmetrically formed by the partition portion 410 to a bottom surface of the upper surface plate 210; Fixing the position on the upper surface plate 210 by sandwiching the LCD glass in the placement unit 420; And supplying the polishing liquid to the lower surface plate 110 while repeatedly operating the upper surface 210 on the lower surface plate 110 so that the LCD glass G adheres to the polishing pad 112. .

Description

LCD glass grinding apparatus and LCD method using the same {LCD glass grinding apparatus and grinding method using the same}

The present invention relates to a polishing apparatus capable of polishing a plurality of LCD glasses at once and an LCD polishing method using the same.

Liquid Crystal Display (LCD) is the next generation product that replaces existing CRT monitors and is used in various fields such as computers, monitors, and TVs. These LCDs inject liquid crystals between two thin glasses and then apply a current to a transparent conductive circuit to display text or pictures.

Glass for manufacturing LCD is mainly used with a thickness of 0.4mm-1.1mm, the flatness is very important for accurate display. Therefore, a predetermined polishing process is essential for LCD glass. In the case of ordinary LCD glass, the flatness after final processing should be maintained at 300 mm / 20 mm or less. The polishing of such LCD glass is achieved by turning one LCD glass back and forth on a lower surface plate of a polishing apparatus to which a predetermined polishing pad is attached and rotating.

On the other hand, since the polishing glass must be supplied continuously in the polishing process, the polishing liquid once used in the polishing process is simply recovered and reused.

However, since the polishing of the LCD glass is made in one unit, a large number of polishing apparatuses are required to polish a large number of LCD glasses. However, since the polishing apparatus is very expensive, the polishing cost of the LCD glass is high, and there is a problem in that the production efficiency is very low because polishing is performed one by one.

In addition, since the polishing liquid recovered in the process of polishing the LCD glass contains glass powder or fine fragments, the glass powder or fragments may damage the LCD glass.

The present invention has been made to solve the above problems, an object of the present invention is to provide an LCD glass polishing holder and a method for polishing the LCD glass using the same to apply to the LCD glass polishing apparatus to polish a plurality of LCD glass at a time. do.

Further, another object of the present invention is to provide an LCD glass polishing apparatus capable of selectively appropriately supplying a polishing liquid and a cleaning liquid to enable continuous polishing, and an LCD glass polishing method using the same.

1 is a cutaway perspective view of an LCD glass polishing apparatus according to the present invention;

2 is a partial cross-sectional view showing a driving mechanism of the LCD glass polishing device of FIG. 1;

Figure 3 is a side view schematically showing the operation of the upper surface is turned up and down in the LCD glass polishing apparatus of Figure 1;

4 is a view showing an embodiment of the polishing holder and the LCD glass attached to the upper surface of Figure 1,

5 is a perspective view of the polishing holder of FIG.

FIG. 6 is a view illustrating left and right turning angles of an upper plate when the lower plate of FIG. 1 rotates in a counterclockwise direction.

7 is a view illustrating left and right turning angles of the upper plate when the lower plate of FIG. 1 rotates in a clockwise direction.

8 is a view showing another embodiment of the polishing holder and the LCD glass attached to the upper surface fixed state.

<Explanation of symbols for the main parts of the drawings>

100 ... lower plate unit 110 ... lower plate

112 ... Polishing pad 130. 131 ... Motors and reducers for rotary drives

140 ... shatterproof walls 141 ... discharge passage

142 ... discharge line 200 ... upper plate unit

210 ... upper plate 220 ... turning arm

222 ... upward pivot 230 ... pivot

240, 241 ... swing motors and reducers

250 ... bracket 260 ... cylinder

261 ... lifting rod 300 ... polishing liquid supply

310 ... polishing liquid receiving tanks 311, 312 ... filter

313 ... pressure pump 314 ... agitator

320 ... cleaning liquid receiving tank 321 ... pressure pump

330 ... 3-way valve 331 ... supply pipe

340 ... Dewaterer 341 ... Valves

400, 500 ... Polishing holders 410, 510 ... Divisions

420 ... Placement G ... LCD Glass

In order to achieve the above object, LCD glass polishing apparatus according to the present invention, a predetermined polishing pad 112 is attached to the entire upper surface and the lower surface plate (rotating in a predetermined direction by the rotary drive motor 130 ( 110); An upper surface plate 210 that rotates left and right by a predetermined angle on the lower surface plate 110 and rotates in close contact with the lower surface plate 110 by a predetermined turning drive motor 240; Polishing holders 400 and 500 attached to the bottom surface of the upper surface plate 210 and having at least two or more placement portions 420 formed symmetrically by the partition portion 410 so as to sandwich the LCD glass. ; And a polishing liquid supply unit 300 for supplying the polishing liquid to the supply pipe 331 installed on the lower surface plate 110, wherein the polishing liquid supply unit 300 is polished via the lower surface plate 110. A polishing liquid receiving tank 310 in which liquid is collected and received; A cleaning liquid containing tank 320 in which the cleaning liquid is accommodated; A 3-way valve connected to the polishing liquid receiving tank 310, the cleaning liquid receiving tank 320, and the supply pipe 331 to selectively convert the flow of the polishing liquid or the cleaning liquid into the supply pipe 331. 330; A filter 311 and 312 and a pressure pump 313 installed between the polishing liquid receiving tank 310 and the 3-way valve 330; And a pressure pump 321 disposed between the cleaning solution accommodation tank 320 and the 3-way valve 330.

Here, the polishing liquid is a mixture of cerium oxide and DI water, or a mixture of cerium oxide and water filtered out, or a detergent and DI water.

The filter 312 is a filter for filtering particles of 3 μm to 7 μm, and the filter 311 is a filter for filtering particles of 0.5 μm to 1.5 μm.

In order to achieve the above object, LCD glass polishing method according to the present invention, the lower surface plate 110 is attached to a predetermined polishing pad 112 on the entire upper surface and rotates in a predetermined direction; An upper surface plate 210 that rotates left and right by a predetermined angle on the lower surface plate 110 and rotates in close contact with the lower surface plate 110; In the polishing method using the LCD glass polishing apparatus having a; Polishing liquid supply unit 300 for supplying a polishing liquid or a cleaning liquid on the lower surface 110, the partition portion 410 on the bottom surface of the upper surface 210 Attaching at least two polishing holders 400 on which at least two placement portions 420 are formed symmetrically; Fixing the position on the upper surface plate (210) by sandwiching the LCD glass in the placement unit (420); The upper plate 210 is lowered on the lower plate 110 so that the LCD glass G is in close contact with the polishing pad 112, and then the left and right repetitive turning operations are performed. Supplying); characterized in that it comprises a.

In the present invention, when the lower surface plate 110 rotates in the counterclockwise direction, the right turning angle (b) of the upper surface plate 210 is the left turning angle based on the central axis of the lower surface plate 110. Greater than (a)

In addition, when the lower surface plate 110 rotates in the clockwise direction, the left turning angle a 'of the upper surface plate 210 is the right turning angle b' based on the central axis of the lower surface plate 110. Greater than)

Further, after the polishing of the LCD glass is finished and before the polishing of the other LCD glass is started, it is preferable to further include the step of supplying a cleaning liquid onto the lower surface 110 to clean the lower surface 110. .

Hereinafter, an LCD glass polishing apparatus and an LCD glass polishing method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cutaway perspective view of an LCD glass polishing apparatus according to the present invention, FIG. 2 is a partial cross-sectional view showing a driving mechanism of the LCD glass polishing apparatus of FIG. 1, and FIG. 3 is an upper portion of the LCD glass polishing apparatus of FIG. 1. It is a side view which shows schematically the operation | movement which a surface plate turns to up-down.

As shown in the figure, the LCD glass polishing apparatus is largely attached and fixed to the lower surface unit 100, the upper surface unit 200, the polishing liquid supply unit 300, and the upper surface plate 210 of the upper surface unit. The polishing holder 400 is included.

The lower surface plate unit 100 is provided for the lower surface plate 110 to which a predetermined polishing pad 112 is attached to the entire upper surface, and is installed on the main body 120 to rotate the lower surface plate 110 in a predetermined direction. The motor 130 and the reducer 131 are included. The outer periphery of the lower surface plate 110 is provided with a scattering prevention wall 140 for preventing the polishing liquid supplied through the supply pipe 331 is scattered, the inner periphery of the scattering prevention wall 140 to one side Since the inclined discharge passage 141 is formed, the used polishing liquid is re-introduced into the polishing liquid supply unit 300 through the discharge pipe 142 drawn outward.

The upper surface unit 200 is attached to the LCD glass to be polished on the bottom surface, the upper surface 210 is rotated in close contact with the lower surface 110, and the upper surface 210, the upper surface of the main body 120 Revolving arm 220 to support the horizontal direction in the direction, the pivot axis 230 for supporting the pivot arm 220 to be turned in both left and right directions, and the pivot axis 230 is repeated in both left and right It includes a swing drive motor 240 and a speed reducer 241 for driving the connecting rod 232 to swing. Here, the bracket 250 is rotatable around the upward pivot shaft 222 is installed at the end of the swing arm 220, the cylinder 250 for elevating the upper surface 210 is installed on the bracket 250 have. The upper surface plate 210 is installed on the lifting rod 261 of the cylinder.

The polishing liquid supplying part 300 supplies the polishing liquid or the cleaning liquid onto the lower surface plate 110 through the supply pipe 331, and the polishing liquid storage tank in which the polishing liquid via the lower surface plate 110 is recovered and accommodated. 310, a cleaning liquid containing tank 320 in which the cleaning liquid is accommodated, and a 3-way valve 330 for switching the flow of the polishing liquid or the cleaning liquid.

In the polishing liquid receiving tank 310, an agitator 314 is provided to stir the abrasive to prevent precipitation from the reflowed polishing liquid.

The cleaning liquid containing tank 320 contains a cleaning liquid in which detergent and DI water are mixed. At this time, the detergent is preferably a 20% solution of alkaline detergent containing calcium hydroxide. The cleaning solution receiving tank 320 is connected to the dea water maker 340 and the valve 341, so that the dea water is smoothly supplied.

The polishing liquid accommodation tank 310, the cleaning liquid accommodation tank 320, and the supply pipe 331 are all connected to the 3-way valve 330. The 3-way valve 330 selectively converts the flow of the polishing liquid or the cleaning liquid into the supply pipe 331.

On the other hand, between the polishing liquid receiving tank 310 and the 3-way valve 330, the filter 311, 312 and the pump pump 313 is installed. At this time, the 312 filter was a filter for filtering particles of 3 µm to 7 µm, and a filter for filtering 5 µm particles was used in this embodiment. In addition, the 311 filter is a filter that filters out 0.5 µm-1.5 µm particles. In this embodiment, a filter that filters 1 µm particles was used. Here, although the grinding | polishing liquid consists of mixing cerium oxide and DI water, it is preferable to implement by mixing 18 liters of water with 1.5 kg of cerium oxide.

In addition, a pressure pump 321 is also installed between the cleaning liquid receiving tank 320 and the 3-way valve 330.

The 3-way valve 330, the pressure pump 313, 321, and the valve 341 are appropriately controlled by a controller (not shown).

Figure 4 is a view showing an embodiment of the polishing holder and the LCD glass attached to the upper surface of Figure 1, Figure 5 is a perspective view of the polishing holder of FIG. Referring to the drawings, in the polishing holder 400 installed on the bottom surface of the upper surface plate 210, four placement portions 420 are formed in which four pieces of LCD glass G are symmetrically arranged. The placement unit 420 is formed by being partitioned by the partition unit 410, and the polishing holder 400 is made of a synthetic resin material such as Bakelite.

As shown in Fig. 8, the polishing holder may have a structure in which two LCD glasses are symmetrically sandwiched. As described above, the number of arrangement portions formed in the polishing holder may be increased as necessary.

A polishing method using the LCD glass polishing apparatus having the above structure will be described.

As shown in FIG. 3, the upper surface 210 is pivoted upward to attach the polishing holder 400 of the present invention to the bottom thereof, and the LCD glass G is disposed on the placement portion 420 of the polishing holder 400. Will be fitted. At this time, a porous sheet is installed on the bottom surface of the upper surface plate 210 in the placement portion 420, and the LCD glass G sandwiched in the placement portion 420 is firmly fixed to the upper surface plate 210. Thereafter, the upper surface 210 is pivoted downward so that the surface of the LCD glass bottom portion and the surface of the polishing pad 120 of the lower surface 110 are in close contact with each other.

Next, when the swing arm 220 is repeatedly rotated in both the left and right directions while rotating the lower surface 110 in one direction, the surface of the LCD glass interposed therebetween is also polished while the upper surface 210 is rotated by the frictional force. . On the other hand, in the polishing process, the polishing liquid is pumped by the pressure pump 313 in the polishing liquid receiving tank 310 and supplied to the lower surface plate 110 through the supply pipe 331, the used polishing liquid is discharge passage Through the 141 and the discharge pipe 142 is recovered to the polishing liquid receiving tank 310 again. At this time, the 3-way valve 330 prevents the cleaning liquid from the cleaning liquid containing tank from flowing into the supply pipe 331. Thereafter, the polishing liquid is again supplied to the supply pipe 331 through the pressure pump 313, where the 312 filter removes relatively large glass powder and debris contained in the polishing liquid, and the 311 filter is fine glass powder. Remove it.

As shown in FIG. 6, when the lower surface plate 110 rotates in the counterclockwise direction, the right turning angle b of the upper surface plate 210 is turned left based on the central axis of the lower surface plate 110. The turning drive motor 240 is controlled to be larger than the angle a. Because, when the upper surface plate 210 comes to the right side, the reverse force is transmitted to the LCD glass G, and the friction force applied to the LCD glass becomes large. If the frictional force is large, the grinding force is increased, but the edge portion of the LCD glass is over-polishing, and the life of the polishing holder 400 is reduced. Therefore, when the upper surface 210 comes to the right with respect to the center of the lower surface 110, the right turn angle (b) of the upper surface is larger than the left turn angle (a) so that the frictional force applied is small. At this time. The right turn angle b of the upper surface plate 210 is such that the portion where the LCD glass G is separated from the edge of the lower surface plate 110 is approximately 1/3 when the diagonal direction of the LCD glass is used. Preferably, the left turning angle a of the upper surface plate 210 is such that the portion where the LCD glass G is separated from the edge of the lower surface plate 110 is 1/3 or less.

On the other hand, when the lower surface plate 110 rotates in the clockwise direction, as shown in FIG. 7, when the left turn angle a 'of the upper surface plate 210 is based on the central axis of the lower surface plate 110 is It is larger than the right turn angle b '. Since this is for the same reason as described in Fig. 6, detailed description thereof will be omitted.

Next, when polishing of the LCD glass is completed, the LCD glass is removed from the upper surface plate 210. Then, before polishing the next LCD glass, the control unit operates the 3-way valve 330 to allow the cleaning liquid of the cleaning liquid receiving tank 320 to flow through the supply pipe 331 to the lower plate 110 for cleaning. To be able.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom.

As described above, according to the LCD glass polishing apparatus of the present invention and the LCD glass polishing method using the same, since a plurality of LCD glass can be polished at a time, the polishing cost of the LCD glass can be lowered and the production efficiency can be improved. There is.

In addition, when the polishing liquid is recycled, by removing the glass powder or debris inside the polishing liquid, it is possible to prevent the damage of the LCD glass in the polishing process as much as possible, and to selectively remove the polishing liquid and the cleaning liquid with a 3-way valve Since it can be supplied, there is an effect that can further eliminate the defects of the polishing process.

Claims (9)

A lower surface plate 110 attached to a predetermined polishing pad 112 on the entire upper surface and rotated in a predetermined direction by a motor 130 for rotating driving; An upper surface plate 210 that rotates left and right by a predetermined angle on the lower surface plate 110 and rotates in close contact with the lower surface plate 110 by a predetermined turning drive motor 240; Polishing holders 400 and 500 attached to the bottom surface of the upper surface plate 210 and having at least two or more placement portions 420 formed symmetrically by the partition portion 410 so as to sandwich the LCD glass. ; And a polishing liquid supply unit 300 for supplying the polishing liquid to the supply pipe 331 installed on the lower surface plate 110. The polishing liquid supply unit 300 includes: a polishing liquid receiving tank 310 in which the polishing liquid via the lower surface plate 110 is recovered and accommodated; A cleaning liquid containing tank 320 in which the cleaning liquid is accommodated; A 3-way valve connected to the polishing liquid receiving tank 310, the cleaning liquid receiving tank 320, and the supply pipe 331 to selectively convert the flow of the polishing liquid or the cleaning liquid into the supply pipe 331. 330; A filter 311 and 312 and a pressure pump 313 installed between the polishing liquid receiving tank 310 and the 3-way valve 330; And a pressure pump (321) installed between the cleaning liquid receiving tank (320) and the 3-way valve (330). delete The method of claim 1, The polishing liquid is an LCD glass polishing apparatus, wherein cerium oxide and DI water are mixed, or water in which cerium oxide and foreign matter have been removed. The method of claim 1, The cleaning liquid, LCD glass polishing apparatus, characterized in that the detergent and DI water is mixed. The method of claim 1, The filter (312) is a filter for filtering particles of 3㎛-7㎛, LCD 311 is a filter for filtering 0.5㎛-1.5㎛ particles, characterized in that the LCD glass polishing apparatus. A lower surface plate 110 attached to a predetermined polishing pad 112 on the entire upper surface and rotating in a predetermined direction; An upper surface plate 210 that rotates left and right by a predetermined angle on the lower surface plate 110 and rotates in close contact with the lower surface plate 110; In the polishing method using an LCD glass polishing apparatus having a; Polishing liquid supply unit 300 for supplying a polishing liquid or a cleaning liquid on the lower surface 110, Attaching a polishing holder (400) on the bottom of the upper surface plate (210) in which at least two or more placement units (420) are formed symmetrically by partitions (410); Fixing the position on the upper surface plate (210) by sandwiching the LCD glass in the placement unit (420); The upper plate 210 is lowered on the lower plate 110 so that the LCD glass G is in close contact with the polishing pad 112, and then the left and right repetitive turning operations are performed. LCD glass polishing method comprising; supplying. The method of claim 6, When the lower surface plate 110 rotates in the counterclockwise direction, the right turn angle (b) of the upper surface plate 210 is greater than the left turn angle (a) based on the central axis of the lower surface plate 110. LCD glass polishing method, characterized in that. The method of claim 6, When the lower surface plate 110 rotates in the clockwise direction, the left turning angle a 'of the upper surface plate 210 is greater than the right turning angle b' when the lower surface plate 110 is rotated in the clockwise direction. LCD glass polishing method characterized in that large. The method according to claim 7 or 8, And after the polishing of the LCD glass is finished, before the polishing of the other LCD glass is started, the cleaning liquid is supplied to the lower surface plate 110 to clean the lower surface plate 110. Glass polishing method.