JP6202906B2 - Grinding equipment - Google Patents

Description

  The present invention relates to a plate workpiece grinding apparatus, and is particularly suitable for grinding a hard brittle material such as a glass substrate used in a display unit of a mobile electronic device.

Display panels such as glass substrates are used in various portable devices called media players, tablet terminals, smartphones, and the like.
This plate-like workpiece such as a glass substrate is required not only for external grinding but also for internal grinding such as hole machining and recess machining in accordance with the shape of the display part.
Also, the size of the glass substrate is various.
If a plurality of processes such as the external grinding process and the internal grinding process are performed by a grinding apparatus, a plurality of grinding apparatuses are required, which leads to problems of increase in equipment size and cost.
Patent Document 1 discloses a grinding apparatus that performs inner and outer peripheral machining of a disk used as a recording medium, and is designed to save installation space by providing two sets of machining units in one machine.
However, it cannot be directly applied to the grinding of plate-like workpieces having different outer shapes.

JP-A-2005-271105

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compact and highly productive grinding apparatus that can perform a wide variety of grinding processes, such as external grinding, hole machining and recess machining, on a plate-like workpiece.

A grinding apparatus according to the present invention includes a work table that holds and rotates a plate-shaped workpiece, and a grindstone that grinds the plate-shaped workpiece, the work table is controlled to rotate in the C axis, and the grindstone is controlled to move in the X-axis direction. The C-axis rotation control means is directly driven or decelerated according to the size of the plate-like workpiece.
In the present invention, a polar coordinate system processing control is performed in which a plate-shaped workpiece is held on a work table and a rotating grindstone is controlled close to and away from the workpiece according to the rotation angle of the workpiece axis. As a result, a compact apparatus composed of a work table whose C axis rotation is controlled and a rotating grindstone whose movement is controlled in the X axis direction is obtained.
When such a polar coordinate system control method is adopted, it is necessary to press the processing point with a predetermined force while finely moving the rotating grindstone. Therefore, from the size of the plate workpiece and the center of the C axis of the grinding processing point. Depending on the distance, there is a difference in the torque required to hold the plate-like workpiece.
Therefore, the present invention provides direct drive control to a motor that controls the rotation angle of a work table according to the size of a plate-like work such as a glass substrate for a smartphone and a glass substrate for a tablet terminal having a relatively larger outer shape than that. Or through a speed reducer in the meantime.
Although the direct drive motor can obtain a low rotation speed and high torque, if the plate-shaped workpiece becomes large, it may be pressed against the grindstone and may not be able to hold the workpiece with high accuracy. Is intended.
There are no limitations on the speed reduction means, such as gears, pulleys, and cam floors.

In the present invention, the grindstone has an outer grindstone for grinding the outer shape of the plate-shaped workpiece, and an inner grindstone for drilling or / and recessing the plate-shaped workpiece, and the outer grindstone, the inner grindstone, May be individually controlled to move up and down, and the whole may be controlled to move in the X-axis direction.
In this way, since the outer grindstone, the inner grindstone and other grindstones are controlled in the X-axis direction as a whole without individually controlling the movement in the X-axis direction, the number of parts is reduced and the structure of the control system is simplified. Therefore, it becomes a compact and inexpensive processing device.

In the present invention, it may further include a delivery hand for delivering the plate-like work to the work table, and the delivery hand may be controlled to move up and down and move as a whole along with the grindstone.
Further, a pair of processing stations including a work table and a grindstone may be provided in the front-rear direction.
If it does in this way, it will become a more compact processing device.

  In the present invention, it may have a loading device for delivering a plate-like work to the delivery hand, the work table has a suction holding means for the plate-like work, and the suction holding means is the size of the plate-like work. May be replaceable.

  In the grinding apparatus according to the present invention, by adopting the C-axis rotation control means of the work table corresponding to the size of the plate-like workpiece, it can be used for a wide variety of plate-like workpieces, and a plurality of grinding stones and workpieces can be transferred. When the hands are provided, they are moved and controlled in the X-axis direction as a whole, so that the number of parts can be reduced and a compact device can be obtained.

(A) shows the structure of a grinding-work apparatus typically, (b) is a principal part figure of a work table and a rotating grindstone. The movements of the external grinding wheel and the internal grinding wheel are schematically shown. (A) shows the state where the external grinding wheel is lowered, and (b) shows the state of external grinding. (C) shows a state in which the inner grindstone is lowered and the inner grinding is performed. (A) shows the external grinding of a plate-shaped workpiece, and (b) shows the internal grinding. (A)-(d) shows the flow of delivery of a plate-shaped workpiece. (A) shows the positional relationship of an external grindstone, an internal grindstone, a delivery hand, and a work table, (b) shows a top view. (C) shows a cross-sectional view of the raising / lowering part of the external grinding wheel shaft and the internal grinding wheel shaft.

  Although the structural example of the grinding-work apparatus 10 which concerns on this invention is demonstrated based on drawing below, this invention is not limited to this.

FIG. 1 shows a configuration diagram of a main part of the grinding apparatus 10, and an operation panel, a control unit, a cover member, and the like are not shown.
In the present invention, the horizontal direction of the grinding apparatus is defined as the X-axis direction, and the vertical direction is defined as the Z-axis direction.
In this embodiment, as shown in FIG. 1 (a), a processing station comprising a work table 11, an X-axis slider 12, a Z-axis slider 13 and a loading system for conveying a work is made into a pair of two stations in the front-rear direction. It has become.

The X-axis slider 12 that is controlled to move in the X-axis direction is rotationally controlled by an outer grindstone 21 and an inner grindstone shaft 32 that are rotationally controlled by an outer grindstone shaft 22 as shown in FIG. Further, a delivery hand 41 for delivering the plate-like workpiece W to the inner grindstone 31 and the work table 11 is attached.
As a result, the outer grindstone 21, the inner grindstone 31, and the delivery hand 41 are integrally controlled to move in the X-axis direction.
In addition, what is necessary is just to provide the delivery hand 41 as needed.
Therefore, the number of parts is small and the design is compact compared to a structure that individually controls movement in the X-axis direction.
The external grinding wheel shaft 22 is rotationally transmitted by a belt 24 to a driven pulley 23 b provided on the shaft side and a drive pulley 23 a provided on the belt drive motor 23 side.
The drive system by the external grinding wheel shaft 22 and the belt drive motor 23 is integrally attached to the Z-axis slider 13.
As a result, the outer grindstone 21 is controlled to move up and down by the Z-axis slider 13.
The outer grindstone 21 is mainly for grinding the outer periphery of the plate-like workpiece W as shown in FIG.
The plate-like workpiece W is held by the work table 11 provided on the upper portion of the table rotation shaft 11a that is controlled to rotate in the C axis.
As shown in FIG. 3A, the plate-like workpiece W rotates while the rotation angle θ is controlled by the C axis, and the outer grindstone 21 moves along the outline a of the plate-like workpiece W in the X-axis direction. Move a little.
Thus, the external grinding wheel 21 is externally ground by pressing the side surface of the plate-like workpiece W while being position-controlled in the polar coordinate system with respect to the center of the C axis.
Therefore, the work table holding the plate-like workpiece is loaded with a pressing force by the external grindstone 21, and its size depends on the size of the plate-like workpiece W.
Therefore, according to the present invention, the direct drive control directly connected to the motor that controls the C-axis rotation of the table rotation axis and the method of the deceleration control via the reduction gear are selected and used according to the size of the plate-like workpiece. It is possible.

The inner grindstone 31 is rotationally controlled by the drive motor 33 via the inner grindstone shaft 32.
The inner grinding wheel 31 is controlled to move in the Z-axis direction by an inner grinding wheel elevator 34 together with a drive motor 33.
The inner grindstone 31 is mainly used for machining a recess so as to scrape off a part of the front surface or the back surface of the plate-like workpiece W as shown in FIG. It is done.
Also in this case, the inner grindstone 31 is controlled to move in the X-axis direction by using the polar coordinate system for the plate-like workpiece W whose C-axis rotation is controlled so that the inner shape line b of the plate-like workpiece W can be obtained as in the external grinding. ing.

An example of methods of external grinding and internal grinding will be described with reference to FIG.
When the plate work W is held on the work table 11 and external grinding is performed, the external grindstone 21 is lowered by the Z-axis slider 13 as shown in FIGS. Fine movement control in the X-axis direction is performed by the X-axis slider 12 in accordance with the rotation angle θ.
Moreover, when performing internal shape grinding, as shown in FIG.2 (c), the external shape grindstone 21 raises and it carries out by lowering the internal shape grindstone 31. FIG.

Next, a loading system for the plate workpiece W will be described.
As shown in FIG. 1, work cassettes 17 a and 17 b are provided on the gantry 1 to store a workpiece before grinding and a workpiece after grinding.
A conveyance hand 14 that conveys the plate-like workpiece W is attached to a loader 15 that is controlled to move in the Y-axis direction and the Z-axis direction, and the loader 15 is controlled to move along the guide rail 16 in the X-axis direction. .
The transport hand 14, the loader 15, and the guide rail 16 are also provided as a pair in front and rear.
The plate-like work W taken out from the work cassette by the transport hand 14 is temporarily placed at the position of the pre-centering 18, aligned with the plate-like work, and then delivered to the delivery hand 41.
On the other hand, the plate-like workpiece W for which grinding has been completed is received by the transport hand 14 via the delivery hand 41, dried by the drying unit 19, and stored in the workpiece cassette.
As shown in FIG. 1B, the delivery hand 41 is controlled to move up and down by a hand elevator 42 and is controlled to move in the X-axis direction by the X-axis slider 12.
In the present embodiment, suction holding means 41 a, 14 a, and 14 b are used as work holding means for the delivery hand 41 and the transfer hand 14.
Figure 4 plate workpiece W ₂ before processing that has been transported by the transport hand 14 as shown in (a) is delivered to hand-over hand 41, then it grinding is completed as shown in FIG. 4 (b) take back the plate workpiece W ₁ at the lower side of the suction means 14b.
Plate-shaped workpiece W ₂ before processing that has been handed over to the hand-over hand 41 is conveyed to the work table 11 side as shown in FIG. 4 (d).
The outer grindstone 21, the inner grindstone 31, and the delivery hand 41 are all attached to the X-axis slider 12, and the positional relationship with the work table 11 is shown in FIG.
(A) is a side view, (b) is a plan view, and (c) is a cross-sectional view of the elevating part.
The work table 11 is provided with suction holding means 11b as a work holding means, and is compatible with other work tables 111 having different table upper surface areas depending on the size of the plate-like work.
Moreover, as shown to Fig.1 (a), ATC2 for automatically exchanging a grindstone is provided in the left front part of the mount frame.

1 Stand 2 ATC
DESCRIPTION OF SYMBOLS 10 Grinding apparatus 11 Work table 11a Table rotating shaft 12 X-axis slider 13 Z-axis slider 14 Conveyance hand 15 Loader 16 Guide rail 17a Work cassette 18 Pre-centering 19 Drying unit 21 External grindstone 22 External grindstone shaft 23 Belt drive motor 24 Belt 31 Inner shape grindstone 32 Inner shape grindstone shaft 33 Drive motor 34 Inner shape grindstone lift 41 Transfer hand 42 Hand lift

Claims (2)

A work table that holds and rotates the plate-like workpiece, a grinding wheel for grinding the plate-like workpiece, and a delivery hand for delivering the plate-like workpiece to the work table ,
The work table is controlled by C axis rotation,
The grinding wheel is controlled to move in the X-axis direction,
The C-axis rotation control means is subjected to direct drive control or deceleration control according to the size of the plate workpiece ,
The grindstone has an outer grindstone for grinding the outer shape of the plate-like workpiece and an inner grindstone for drilling or / and recessing the plate-like workpiece,
Whole together with the outer grinding wheel and the inner shape grindstone and said hand-over hand is individually relatively elevation control is integrally X-axis direction movement control,
A transfer hand for transferring the plate-like workpiece to the transfer hand;
The grinding apparatus according to claim 1, wherein the transport hand has suction and holding means for workpieces on the upper side and the lower side, respectively. Wherein the work table has a suction holding means of the plate-shaped workpiece, the suction holding means grinding apparatus according to claim 1, characterized that it is replaceable by the size of the plate-shaped workpiece.

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