KR100276170B1 - Polishing apparatus for flat display glass panel - Google Patents

Abstract

PURPOSE: A plane grinding device of a glass panel for display is provided to improve workability and efficiency by supplying abrasive through a nozzle equipped with an axis of rapping device. CONSTITUTION: A device comprises a support part. A wear table(10) is installed at the support part and supports and rotates a panel. A rapping tool rotates in a rotating direction and an opposite direction of the wear table(10) and has an abrasive nozzle in a central area. A spindle(40) rotates and supports the rapping tool and has an abrasive passage. A head(31) supports the spindle(40). A grinding head(30) has a spindle driving part which drives and rotates the spindle(40). An abrasive supply part is connected to the spindle(40) and supplies an abrasive through the abrasive passage. A slider(20) supports the grinding head(30). A sliding guide part(5) guides a reciprocating motion of the slider(20). An actuator(21) is inserted between the sliding guide part(5) and the slider(20) and make a reciprocating the slider(20) parallel to the surface of the panel within a designated stroke.

Description

Flat polishing device for glass panel for display

The present invention relates to a planar polishing apparatus for a glass panel for a display.

The CRT, or CRT, consists of a glass panel having a display surface and a funnel-shaped glass funnel coupled to the rear of the glass panel. The conventional CRT has a curved display surface, and the curved display surface, that is, the outer surface, is mirror polished by a polishing apparatus, which is developed in various forms. In order to increase the applicability of the fluorescent material, the inner surface opposite to the display surface is provided with a stifle to have an appropriate roughness during the press molding of the panel.

In recent years, monitors employing a CRT having a completely flat display surface have been developed and marketed for increasing visual effects. The glass panel for flat CRTs is molded by dropping molten glass (GOB) having a temperature of around 100 ° C. and below into a mold, and then pressing it with a plunger of a press, similarly to the curved panel. The glass panel on the flat surface is subjected to the mirror polishing process on the outer surface, and then subjected to the internal polishing process to impart the stiple to the inner surface. Such flat panel polishing requires a strict flatness of ± 0.02 mm (± 0.8 mm for curved panels), while a relatively high polishing amount is required to ensure proper productivity. Polishing of flat glass is required not only in the aforementioned flat CRT, but also in other flat panel displays (PDP, LCD).

5 and 6 are a front view and a plan view showing a conventional flat glass polishing apparatus, respectively. As shown in these figures, the conventional polishing apparatus includes a polishing plate 102 on which the polishing mad 102 is placed, a pressing plate 104 provided to face the upper side of the plate 102, and an abrasive. It has a top abrasive supply pipe 106 for supplying the from the top. The polishing table 102 is rotated by a driving device (not shown), and the pressing plate 104 is freely rotatable to the support frame 130 and at the same time swingable within a predetermined angle range as indicated by the dashed-dotted line in FIG. Is supported. In addition, the pressing plate 104 is capable of moving up and down with respect to the surface plate 102 by the lifting unit 131. On the other hand, in addition to the upper abrasive supply pipe 106 for supplying the abrasive from the top, a lower abrasive supply pipe 157 for supplying the abrasive along the rotation axis of the polishing plate 102 is provided.

With this structure, the flat glass 108 to be polished is first adhered to the bottom surface of the pressure plate 104. Then, the abrasive is supplied onto the polishing pad 101 through the upper abrasive supply pipe 106, and the polishing plate 102 is rotated. The pressure plate 104 sufficiently supplied with the abrasive is lowered and pressed by its own weight. At the same time, the pressing plate 104 is rocked as shown by the broken line in FIG. When a predetermined time has elapsed, the air cylinder 145 on the upper portion of the pressure plate 104 is operated to move the pressure plate 104 upwards, and then supply the abrasive through the lower abrasive supply plate 157. Next, the pressure plate 104 is lowered again to resume polishing.

In such a conventional polishing apparatus, since the flat glass which is to be processed should be adhered to the bottom surface of the pressure plate 104, there is a disadvantage in that the installation of the workpiece is difficult. In the initial stage, the polishing agent is supplied at the top, and during polishing, the polishing is suspended and then supplied from the bottom, and then the polishing is resumed. In particular, only the surface plate 102 is rotated and the pressure plate 104 is not rotated. Therefore, when the platen 102 and the axis line coincide with each other during the swinging of the platen, the platen and the platen rotate together to cause a dead zone where the polishing action is stopped.

Accordingly, it is an object of the present invention to provide a planar polishing apparatus for a glass panel for display that can perform planar polishing of the display glass panel with excellent workability and high efficiency.

1 is a front view of a planar polishing device according to the present invention;

2 is an enlarged cross-sectional view of a main part;

Figure 3 is a side view showing a coupling state of the slider and the sliding guide;

4 is a side view of the polishing head;

5 and 6 are a front view and a plan view showing a conventional flat glass polishing apparatus, respectively.

* Explanation of symbols for the main sections of the drawing

4: Rotating Arm 5: Sliding Guide

6: hydraulic cylinder 10: weartable

20: slider 21: actuator

22: bite portion 30: polishing head

31 head portion 32 electric shaft

40: spindle

The above object is, according to the present invention, a flat polishing apparatus for a glass panel for a display having a flat display surface, comprising: a support portion; A wear table installed on the support to support and rotate the panel; A lapping tool having an abrasive nozzle in a central area in contact with the surface of the panel and rotating in a direction opposite to the rotation direction of the wear table, and being formed to extend to the abrasive nozzle along the axis while supporting the lapping tool. A polishing head having a spindle having an abrasive flow path forming a flow path, a head portion for supporting the spindle, and a spindle drive portion for rotating the spindle; An abrasive supply unit connected to the spindle to supply an abrasive through the abrasive passage; A slider for supporting the polishing head; A sliding guide for guiding the reciprocating motion of the slider; And an actuator interposed between the sliding guide portion and the slider to reciprocate the slider within a predetermined stroke range in parallel with the surface of the panel.

Here, it may be configured to further include a pivoting arm which is rotatably supported by the support portion, wherein the sliding guide is advantageously provided on the pivoting arm. And, it may further include a rotation drive means for rotating the rotational arm.

On the other hand, the spindle drive unit, the drive motor, the transmission shaft which is rotated concentrically from the outside of the spindle by the drive motor, and interposed between the transmission shaft and the spindle to transmit a rotational force and the spindle is the rotating shaft It can be configured to include a ball spline to allow movement in the axial direction with respect to.

In addition, it is advantageous to provide a hydraulic cylinder which presses the spindle toward the panel.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a front view of the planar polishing apparatus according to the present invention, Figure 2 is an enlarged cross-sectional view of the main part. As can be seen from these figures, this planar polishing apparatus has a support 1 and a stand 2 standing up on one side of the support 1. At the upper end of the stand 2, a rotational arm 4 rotatably coupled to the swinging hinge 3 is provided, and the rotational arm 4 is driven by a rotational drive means. In this embodiment, the rotation drive means is replaced by a hydraulic cylinder (6) installed on one side of the stand (2).

On the support part 1, the wear table 10 which is rotationally driven by the table drive part 11 is provided in the side part of the stand 2. As shown in FIG. The wear table 10 is driven to rotate about a vertical axis, and a panel P to be polished is supported on the top of the wear table 10.

An upper portion of the wear table 10 is provided with a polishing head 30 that supports a wrapping tool 43 for polishing the panel P, and the polishing head 30 is integrally coupled with the slider 20. .

The slider 20 is supported on the upper portion of the pivoting arm 4 to allow sliding movement in the horizontal direction. 3 is a side view showing a coupling state between the slider 20 and the sliding guide 5 provided at the upper end of the pivot arm 4. The lower lip 22 of the slider 20 and the sliding guide 5 of the pivot arm 4 are engaged with each other in the form of a dovetail, so that the slider 20 is left and right in FIG. 1 with respect to the pivot arm 4. Sliding in the direction. An actuator 21 is provided between the slider 20 and the rotational arm 4 to drive the slider 20 reciprocally sliding in the horizontal direction with respect to the rotational arm 4.

The polishing head 30 integrally coupled to the slider 20 is a cylindrical head portion 31 and a hollow body supported by bearings in the head portion 31 and rotatably received about a vertical axis of rotation. And a spindle 40 concentrically housed within the transmission shaft 32. In addition, the spindle driver (not shown) is interposed between the drive motor 23 and the transmission shaft 32 and the spindle 40 to transmit the rotational force, while allowing the spindle 40 to move in the axial direction with respect to the rotation axis. Ball spline 35. Therefore, the transmission shaft 32 and the spindle 40 are engaged with each other by the ball spline 35 so that the spindle 40 rotates integrally during the rotational movement of the transmission shaft 32, while the spindle 40 is the transmission shaft. It is possible to move along the axial direction with respect to (32).

In addition, a belt pulley 33 is coupled to an upper end of the transmission shaft 32, and the belt pulley 33 drives the driving force from the driving motor 23 provided on the upper side of the slider 20 through the V belt 24. Received. As a result, the transmission shaft 32 and the spindle 40 can be integrally rotated in the opposite direction to the wear table 10.

The spindle 40 is formed in a hollow shaft so as to form an abrasive passage 41 therein. The abrasive is provided in the form of a slurry via the abrasive conduit 48 through an external abrasive supply unit through a connection 47 coupled to a rotary joint at the top of the spindle 40. A flange 42 for coupling the lapping tool 43 is formed at the lower end of the spindle 40, and an abrasive nozzle 44 communicating with the abrasive path 41 in the spindle 40 at the center of the lapping tool 43. ) Is formed. A bellows 45 is installed between the flange 42 and the lower end of the head portion 31 so that foreign matters generated during the polishing operation by the lapping tool 43 are transferred to the head portion 31 and the electric shaft 32 or the spindle ( 40) Do not allow penetration between them.

4 is a side view of the polishing head 30 seen from the right side of FIG. A pair of hydraulic cylinders 35 are mounted on both sides of the head portion 31, and the hydraulic cylinders 35 are connected to the upper end of the spindle 40 through the crossbars 37 to connect the spindle 40. By pressing downward, the wrapping tool 43 serves to press the panel P, which is the workpiece, to provide polishing force.

When the surface grinding of the panel P is started by the above structure, as shown in FIG. ) Rotate in opposite directions, while the slider 20 reciprocates in the horizontal direction by the operation of the reciprocating actuator 21. Then, the spindle 40 is pressurized downward by the pressure hydraulic cylinder 35 to press the wrapping tool 43 against the panel P. The surface of the panel P is evenly ground by the relative rotational movement of the lapping tool 43 and the wear table 10 and the reciprocating linear movement of the slider 20 in the horizontal direction.

At this time, so that the trajectory of the wrapping tool 43 can be evenly applied to the front of the panel (P). The slider 20 and the wear table 10 can be driven according to a program in which the reciprocating motion of the slider 20 and the rotational motion of the wear table 10 are appropriately balanced.

When the polishing operation of the panel P is completed, the supply of the abrasive, the rotational driving of the lapping tool 43, the reciprocating driving of the slider 20 and the rotational driving of the wear table 10 are terminated, and the hydraulic cylinder for rotation 4 ) Rotates the pivot arm 4 to rotate the slider 20 and the polishing head 30 integrally coupled thereto so that the wrapping tool 43 is spaced apart from the top of the wear table 10.

Then, the adjacently arranged pickup head approaches and adsorbs the panel P, which is then taken out by the conveyor for the subsequent process, and the panel P for later new grinding is the upper surface of the wear table 10. Supplied to. When a new panel P arrives, the pivot arm 4 rotates again to bring the wrapping tool 43 to the new panel P, and then resumes a new polishing process. Here, the rotating arm 4 is adjusted to be correctly returned by the rotating hydraulic cylinder 6 based on a signal from a sensor such as a potentiometer so that the horizontality of the slider 20 and the wrapping tool 43 can be secured accurately. do.

In the above-described and illustrated embodiments, the pivot arm 4 pivots up the polishing head 30 after the polishing process is completed to secure the ejection space, but of course, the polishing head 30 may be moved in the horizontal direction. The hydraulic cylinders of other parts may be replaced by other driving means, for example, pneumatic cylinders, etc., which provide the same function.

As described above, in the polishing apparatus of the present invention, the wear table supporting the panel P and the lapping tool rotate in opposite directions, and the lapping tool reciprocates, and the abrasive is continuously maintained through a nozzle provided at the center of the lapping tool. Is supplied. Therefore, compared with the prior art, it is excellent in terms of installation, processing efficiency, workability by continuous supply of abrasives, and the like.

As described above, according to the present invention, there is provided a planar polishing apparatus for a glass panel for display excellent in workability and efficiency.

Claims (5)

A flat polishing apparatus for a glass panel for display having a flat display surface, comprising: a support portion; A wear table installed on the support to support and rotate the panel; A lapping tool having an abrasive nozzle in a central area in contact with the surface of the panel and rotating in a direction opposite to the rotation direction of the wear table, and being formed to extend to the abrasive nozzle along the axis while supporting the lapping tool. A polishing head having a spindle having an abrasive flow path forming a flow path, a head portion for supporting the spindle, and a spindle drive portion for rotationally driving the spindle; An abrasive supply unit connected to the spindle to supply abrasive through the abrasive passage; A slider for supporting the polishing head; A sliding guide for guiding the reciprocating motion of the slider; And an actuator interposed between the sliding guide portion and the slider to reciprocate the slider within a predetermined stroke range in parallel with the surface of the panel. 2. The planar polishing apparatus for a display panel according to claim 1, further comprising a pivoting arm rotatably supported by said support portion, wherein said sliding guide portion is provided on said pivoting arm. 4. The planar polishing apparatus of a display panel according to claim 3, further comprising a rotation driving means for rotating the rotation arm. The spindle drive unit of claim 1, wherein the spindle drive unit comprises a drive motor, a transmission shaft that is rotated concentrically on the outside of the spindle by the drive motor, and is interposed between the transmission shaft and the spindle to simultaneously transmit the rotational force. A planar polishing apparatus for a panel for display, characterized in that the spindle includes a ball spline that facilitates axial movement with respect to the rotation axis. 6. The flat polishing device for a display panel according to claim 5, further comprising a hydraulic cylinder for pressing the spindle toward the panel.

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