JP2002113643A - Chamfering device for plate work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chamfering device capable of accurately chamfering a straight edge part of a plate work without being adversely influenced by the sliding resistance and the vibration. SOLUTION: This chamfering device for plate work is provided with a link mechanism 14 for holding a support table 13 for supporting a plate work 4 movable close to and separate from a rotary grinding tool 2 and a hydraulic support means 15 for levitatingly support the table 13 with the predetermined fluid pressure in the link operating direction via the link mechanism. The hydraulic support means 15 is formed of a bellow-type air spring member or an air cylinder having an internal space 33, to/from which the air is supplied and discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for chamfering a plate-like work, and more particularly to an apparatus for chamfering a linear edge of a liquid crystal glass plate or the like using a rotary grinding tool. It is about.

[0002]

2. Description of the Related Art As is well known, for example, a rectangular glass plate used for sealing a liquid crystal or the like is provided with a required linear edge portion between left and right side edges and front and rear side edges of a front surface and a rear surface, respectively.
Chamfering (thread chamfering) of about C0.05 mm to C0.1 mm is performed.

An apparatus used for chamfering a plate-like work of this type pushes a rotary grinding tool slidably supported on a base or the like onto a linear edge of the plate-like work set on a support table. It is configured to be applied.

In this case, the rotary grinding tool is provided with a predetermined feed through a slide mechanism by the operation of a drive means including a drive source such as a drive motor and a drive mechanism such as a feed screw mechanism. Is usually pressed against the straight edge portion of

Therefore, the size of the chamfer formed on the linear edge of the plate-like work is determined according to the feed amount of the rotary grinding tool by the driving means.

[0006]

However, in the conventional chamfering apparatus, when the driving means applies a predetermined amount of feed to the rotary grinding tool and presses the rotary grinding tool against the plate-like workpiece,
Due to the sliding resistance of the slide mechanism or the like, the feed amount of the rotary grinding tool is deviated or varied, and it is difficult to form a chamfered portion having an accurate dimension on the plate-like work. In particular,
When an extremely small chamfered portion is formed on the liquid crystal glass plate as described above, it is difficult to finely adjust the feed amount of the rotary grinding tool, so that such a problem becomes more remarkable.

Further, since the plate-like work is set on the support table with high supporting rigidity, when the rotary grinding tool is pressed against the plate-like work, an impact load acts on the plate-like work from the rotary grinding tool. Cracks etc. occur in the plate-like work. In particular, when a chamfered portion is formed on a thin and brittle plate-like work such as the glass plate for liquid crystal described above, brittle fracture occurs due to an impact load.

On the other hand, according to Japanese Patent Application Laid-Open No. Hei 4-210365, a configuration in which a rotary grinding tool is supported by a parallel link mechanism so as to be able to move toward and away from a workpiece, and a pneumatic cylinder links the parallel link mechanism. Is disclosed. According to this configuration, since the rotary grinding tool is pressed against the work piece by the link operation of the parallel link mechanism by air pressure, sliding resistance does not occur, and it can be expected that the above problem is solved.

However, according to the apparatus disclosed in the above publication, the rotary grinding tool is pressed against the workpiece in a state where the vibration and the like of the rotary grinding tool are transmitted to the parallel link mechanism. It becomes impossible to precisely grind the workpiece. Since the apparatus disclosed in the publication is used mainly for the work of deburring a cast product, it can be assumed that the vibration does not adversely affect the left.

On the other hand, when an extremely small chamfer is applied to a thin plate-like work as described above, vibrations caused by the rotary grinding tool have a fatal adverse effect, and chatter and cracks occur in the plate-like work. In some cases, it becomes impossible to perform chamfering by itself, or the dimensions of the chamfered portion formed on the plate-like work are greatly disturbed or varied.

The present invention has been made in view of the above circumstances, and is a chamfering apparatus capable of accurately chamfering a linear edge portion of a plate-like work without being adversely affected by sliding resistance or vibration. To provide a technical issue.

[0012]

In order to achieve the above technical object, the present invention provides a support table for supporting a plate-like work, and a rotary grinding tool provided at a position corresponding to a chamfer of the plate-like work. In a plate-shaped workpiece chamfering apparatus provided with a link mechanism, a link mechanism for supporting the support table so as to be able to move toward and away from the rotary grinding tool and a link operating direction of the support table via the link mechanism by a predetermined fluid pressure. And a fluid pressure supporting means for floating support.

According to such a configuration, since the support table is floatingly supported by the fluid pressure support means via the link mechanism, when the rotary grinding tool is pressed against the plate-like work supported by the support table. , The support table slightly moves according to the pressing force of the rotary grinding tool. This allows
Since the pressing force of the rotary grinding tool and the fluid pressure of the fluid pressure support means are balanced, the pressing force of the rotary grinding tool can be made uniform. As a result, even if the feed amount of the rotary grinding tool is inconsistent or uneven, or the rotary grinding tool is vibrated, these are absorbed by the fluid pressure support means and the uniform pressing from the rotary grinding tool is performed. The force forms a chamfered portion of a precise size on the plate-like work.

In this case, a rotary grinding wheel can be used as the rotary grinding tool. According to this method, by pressing the outer peripheral surface of the rotary grinding wheel against the plate-like work,
The chamfered portion is formed on the plate-like work with high accuracy.

On the other hand, as the fluid pressure supporting means, an air spring member which can be extended and contracted in the link operation direction of the link mechanism and in which air is supplied and discharged can be used. In this way, the irregularity of the feed amount of the rotary grinding tool is absorbed by the expansion and contraction operation of the air spring member,
A chamfered portion of an accurate dimension is formed on the plate-like work.

Further, as the fluid pressure support means, an air cylinder in which a piston rod moves in and out in the link operation direction of the link mechanism can be used. If you do this,
The deviation of the feed amount of the rotary grinding tool and the like are absorbed by the reciprocating operation of the piston rod of the air cylinder, and a chamfered portion having an accurate dimension is formed on the plate-like work.

[0017] Preferably, the chamfering device includes a fluid pressure control means for controlling the fluid pressure of the fluid pressure support means. According to such a configuration, it is possible to change the dimension of the chamfer formed on the plate-like workpiece by changing the fluid pressure that balances the pressing force from the rotary grinding tool with the fluid pressure control unit. Thus, it is possible to form chamfered portions having different dimensions according to the difference of the plate-shaped work or the request.

Further, in this chamfering device, the link mechanism comprises:
The connecting member includes a pair of guide links each having one end rotatably connected to the base member, and a connecting member having the other end rotatably connected to each of the pair of guide links. Preferably, the support table is supported so as to be movable in the width direction of the rotary grinding tool. According to such a configuration, the support table is favorably moved by the link operation of the parallel link mechanism, fine movement of the support table is performed smoothly, and the support table is moved in the width direction of the rotary grinding tool. In addition, even a large plate-shaped work can be chamfered over the entire length of the linear edge portion.

Further, in this chamfering apparatus, it is preferable that the link operation direction of the link mechanism and the pressing direction of the rotary grinding tool against the plate-like work make an angle of about 45 degrees with the horizontal plane. According to such a configuration, the direction of action of the fluid pressure on the support table by the fluid pressure support means substantially coincides with the direction of pressing the plate-shaped work by the rotary grinding tool, and the pressing force of the rotary grinding tool and In addition to being able to balance the fluid pressure in an appropriate state, if the plate-like work is set horizontally on the support table, it will be inclined approximately 45 degrees to the front or back surface of the plate-like work. As a result, a chamfering operation is smoothly performed after a layout that is geometrically favorable is formed.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the entire configuration of a plate-shaped workpiece chamfering apparatus according to an embodiment of the present invention. As shown in FIG. 1, a chamfering apparatus 1 includes a tool support unit 3 for supporting a rotary grinding tool 2 formed of a rotary grinding wheel, and a work support unit for supporting a plate-shaped work 4 made of a rectangular thin glass plate for liquid crystal. 5, the two support units 3, 5
It is arranged on the upper surface of the base 6, and its periphery is covered by a cover 7.

The tool support unit 3 includes a tool slide mechanism 8 for guiding the rotary grinding tool 2 in a direction substantially at 45 degrees with respect to a horizontal plane, and a driving means for moving the rotary grinding tool 2 via the tool slide mechanism 8. 9 and the driving means 9
Is composed of a drive mechanism 10 such as a feed screw mechanism and a drive source 11 such as a drive motor. The rotary grinding tool 2, the tool slide mechanism 8, and the driving means 9 are provided at the upper end of a tool-side mounting member 12 fixed to the upper surface of the base 6.

The work support unit 5 includes a support table 13 on which the plate-shaped work 4 is set on the upper surface, a parallel link mechanism 14 that supports the support table 13 so as to be movable in a direction substantially at 45 degrees with respect to a horizontal plane, An air spring member 15 as a fluid pressure supporting means for floatingly supporting the support table 13 in the link operation direction via a parallel link mechanism 14
And Then, the drive source 11 of the tool support unit 3
And the operation of the drive mechanism 10 causes the rotary grinding tool 2 to move obliquely downward by a predetermined feed amount via the tool slide mechanism 8 to a position where the plate-shaped work 4 on the support table 13 is to be chamfered. When pressed, the support table 13 is slightly moved diagonally downward by the link operation of the parallel link mechanism 14 in accordance with the pressing force, and the pressing force and the air pressure of the air spring member 15 become equal, and the pressing force is reduced. It is configured to be kept constant.

A support bracket 16 fixed on the base 6 is interposed between the tool support unit 3 and the work support unit 5, and the support bracket 16 has a dresser 18 with a grindstone dresser portion 17. Is designed to be worn only during use. Also, the work support unit 5
A work handling unit 19 for changing the direction of the plate-shaped work 4 transferred from the support table 13 and returning the work to the support table 13 is provided in a space opposite to the tool support unit 3.

FIG. 2 is an enlarged front view showing details of the work supporting unit 5. As shown in the figure, the work supporting unit 5 includes a pair of elevating members 20 arranged on both sides of the support table 13 in the front-rear direction (a direction perpendicular to the paper surface), and extends over the upper ends of the pair of elevating members 20. An elevating and lowering air cylinder 2 as a single elevating drive means attached to a lower part of the supporting table 13 via a supporting member 22 and vertically moving up and down the pair of elevating members 20.
3 is provided. Then, the elevating member 20 moves down by the operation of the elevating air cylinder 23, and the plate member 4 is sandwiched between the set member 21 and the support table 13 as indicated by a dashed line, whereby the plate member 4 is moved. Support table 13
Is set on the upper surface of the.

The parallel link mechanism 14 supporting the support table 13 includes a link-side mounting member 24 fixed to the base 6.
A pair of guide links 25, each of which is rotatably connected to the (first base side member) at a predetermined distance from the first base member,
The other end of each of the pair of guide links 25 includes a link connecting member 26 rotatably connected thereto,
It is arranged in a state inclined at 45 degrees. A work slide mechanism 27 is provided on the upper end of the link connecting member 26.
The support table 13 is held via the. The work slide mechanism 27 includes a guide rail 28 fixed to the upper end of the link connecting member 26 and extending in the front-rear direction.
Guide rail 2 fixed to the lower end of support table 13
8 and a slider 29 supported so as to be slidable in the front-rear direction along the upper surface portion. Therefore, the support table 13 is movable in the width direction of the rotary grinding tool 2. Further, at the lower part of the guide rail 28,
A pair of slide air cylinders 30 as slide drive means for sliding the slider 29 and the support table 13 in the front-rear direction with respect to the guide rail 28 are provided.

The air spring member 15 is a link drive side mounting member 31 (second base side member) fixed to the base 6.
And the link connecting member 26. The air spring member 15 is a bellows member having a hollow bellows shape which can be expanded and contracted in a link operation direction of the parallel link mechanism 14, that is, in a direction substantially 45 degrees with respect to a horizontal plane.
The material may be a flexible material such as resin or rubber, or may be a metal such as stainless steel or copper. In any case, any material can be used as long as it can convert air pressure into displacement.
In this case, one end of the air spring member 15 is fixed to the link driving side mounting member 31 and the other end is the link connecting member 2.
6 fixed. A guide link 25 is provided between the link-side mounting member 24 and the link drive-side mounting member 31.
(Link operation by the weight of the parallel link mechanism 14)
Is disposed at a predetermined position from below.

The internal space 33 of the air spring member 15
Is connected to an air supply / discharge circuit 35 as a fluid supply / discharge circuit, and the air supply / discharge circuit 35 includes an air spring member 1.
An air pressure control means 36 is provided as a fluid pressure control means including a pressure control valve or the like for making a set pressure of air in the internal space 33 of the fifth variable.

Note that the direction of movement of the chamfered portion of the plate-like work 4 accompanying the movement of the support table 13 and the direction of movement of the center of rotation of the rotary grinding tool 2 are set so as to be substantially on the same straight line.

In order to chamfer the plate-like work 4 by the chamfering apparatus 1 having the above-described configuration, first, the driving means 9 of the tool support unit 3 shown in FIG. Is moved obliquely approximately 45 degrees downward by a predetermined feed amount, and the support table 1 of the work support unit 5 is moved.
The rotary grinding tool 2 is pressed against a portion of the plate-shaped work 4 set on 3 to be chamfered. In this case, since the rotary grinding tool 2 is supported by the tool-side mounting member 12 fixed to the upper surface of the base 6 via the tool slide mechanism 8, its support rigidity is supported by, for example, a parallel link mechanism. Therefore, the vibration generated with the rotation of the rotary grinding tool 2 is reduced.

When the rotary grinding tool 2 presses the plate-shaped work 4 as described above, the parallel link mechanism 14 performs a link operation to contract the air spring member 15, and the air spring member 15 at this time is contracted. The air pressure in the internal space 33 and the pressing force of the rotary grinding tool 2 are balanced. Thus, even if the feed amount of the rotary grinding tool 2 is out of order or uneven, or the rotary grinding tool 2 is vibrated, these displacements are absorbed by the air spring member 15. Therefore, the pressing force acting on the plate-like work 4 from the rotary grinding tool 2 is made uniform, and a chamfer having an accurate dimension is formed on the plate-like work 4.

In this case, the air pressure in the internal space 33 of the air spring member 15 is preferably maintained at a set pressure by providing a relief valve or the like in the air supply / discharge circuit 35, for example. With this configuration, the pressing force acting on the plate-shaped work 4 from the rotary grinding tool 2 is reduced by the air spring member 15.
Is determined by the air pressure (set pressure) of the internal space 33, and the size of the chamfer formed on the plate-shaped work 4 is also determined by the air pressure.

As described above, the plate-like work 4 is
If the support table 13 is slid in the front-rear direction by operating the slide air cylinder 30 in a state where the platen work 4 is pressed, a chamfered portion over the entire length is formed on the right edge of the surface of the plate-shaped work 4 in the illustrated example. For example, in this chamfering device 1,
A chamfer of C0.05 mm to C0.1 mm is formed on the plate-shaped work 4.

After completion of the chamfering operation on one linear edge of the plate-like work 4, the lifting / lowering air cylinder 23 is lifted to release the setting of the plate-like work 4, and the work handling from the support table 13 is performed. The plate-like work 4 is transferred to the unit 19, and after this transfer, the plate-like work 4
Rotate horizontally 0 or 180 degrees. Thereafter, the plate-shaped work 4 is transferred onto the support table 13 and set again.
In the same manner as described above, the other linear edge portion of the plate-shaped work 4 is chamfered. In this case, if the air pressure control means 36 changes the air pressure (set pressure) in the internal space 33 of the air spring member 15, the pressing force acting on the plate-like work 4 from the rotary grinding tool 2 changes. The dimensions of the chamfered portion formed on the plate-like work 4 also change.

As described above, under the condition that the rotary grinding tool 2 is stopped with being supported by the high support rigidity, the rotary grinding tool 2 applies the air pressure of the air spring member 15 to the plate-shaped work 4. Since the pressing force acts, it is less likely to be affected by the vibration accompanying the rotation of the rotary grinding tool 2.
In addition, since the link operation of the parallel link mechanism 14 does not cause sliding resistance, the rotary grinding tool 2 is pressed against the plate-shaped work 4 with a pressure exactly corresponding to the air pressure, and is pressed against the thin plate-shaped work 4. Extremely small chamfering can be performed with high precision.

FIG. 3 illustrates a second embodiment of the chamfering device according to the present invention. In FIG. 3, the same components as those in the first embodiment shown in FIG. 2 described above are denoted by the same reference numerals, and description thereof will be omitted. The second embodiment is different from the first embodiment in that the fluid pressure supporting means for linking the parallel link mechanism 14 is approximately 45 degrees with respect to the link operation direction of the parallel link mechanism 14, that is, the horizontal plane. The point is that an air cylinder 38 having a piston rod 37 that can move back and forth in the direction of is used.

The cylinder tube 39 of the air cylinder 38 is fixedly supported by the link drive side mounting member 31 fixed to the base 6, and the tip of the piston rod 37 contacts the lower end of the link connecting member 26. I have. Therefore, also in the second embodiment, the rotary grinding tool 2 is pressed against the plate-shaped work 4 with a pressure corresponding to the air pressure of the air spring member 15, and the same advantages as those in the first embodiment described above. You can enjoy.

[0038]

As described above, according to the chamfering device according to the present invention, the link mechanism for supporting the supporting table for supporting the plate-like work so as to be able to move toward and away from the rotary grinding tool, and the supporting table are provided. And a fluid pressure support means that floats in the link operation direction via a link mechanism, so that when the rotary grinding tool is pressed against a plate-like work supported by the support table, the pressing force of the rotary grinding tool depends on the pressing force. As a result, the support table slightly moves, and the pressing force of the rotary grinding tool is balanced with the fluid pressure of the fluid pressure support means. Therefore, an unreasonable displacement of the rotary grinding tool such as an irregular feed amount, a variation or a vibration is absorbed by the fluid pressure supporting means, and a chamfered portion having an accurate dimension is formed on the plate-like work.

Further, since the link operation of the parallel link mechanism does not involve sliding resistance, the rotary grinding tool is pressed against a plate-like work with a pressure corresponding exactly to the air pressure, thereby forming a thin plate-like work. Extremely small chamfering can be performed with high precision.

Further, since no impact load is applied to the plate-like work from the rotary grinding tool, the occurrence of brittle fracture when the plate-like work is a thin glass plate or the like is avoided.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic overall configuration of a chamfering device according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view showing a main part of the chamfering device according to the first embodiment of the present invention.

FIG. 3 is an enlarged front view showing a main part of a chamfering device according to a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 chamfering device 2 rotary grinding device 4 plate-like work 6 base 13 support table 14 link mechanism (parallel link mechanism) 15 fluid pressure support means (air spring member) 25 guide link 26 linking member (linking linking member) 36 fluid pressure Control means (air pressure control means) 37 Piston rod 38 Fluid pressure support means (air cylinder)

Claims (7)

[Claims] A support table for supporting a plate-like work;
A plate grinding apparatus provided with a rotary grinding tool provided at a position corresponding to a chamfered portion of the plate workpiece, wherein the support table is supported so as to be movable toward and away from the rotary grinding tool. A chamfering apparatus for a plate-like work, comprising: a link mechanism; and fluid pressure supporting means for floatingly supporting the support table in a link operation direction via the link mechanism by a predetermined fluid pressure. 2. The chamfering apparatus for a plate-like workpiece according to claim 1, wherein the rotary grinding tool is a rotary grinding wheel. 3. The air pressure member according to claim 1, wherein the fluid pressure supporting means is an air spring member which is expandable and contractible in a link operation direction of the link mechanism and in which air is supplied and discharged. Chamfering device for plate-like work. 4. The plate work chamfering device according to claim 1, wherein the fluid pressure supporting means is an air cylinder in which a piston rod moves in and out of a link operation direction of the link mechanism. . 5. A fluid pressure control means for controlling a fluid pressure of said fluid pressure support means.
The chamfering apparatus for a plate-like work according to any one of the above. 6. A pair of guide links, one end of each of which is rotatably connected to a base member, the link mechanism comprising:
The other end of each of the pair of guide links is constituted by a parallel link mechanism having a connecting member rotatably connected thereto, and the supporting table is supported by the connecting member so as to be movable in the width direction of the rotary grinding tool. The chamfering apparatus for a plate-like work according to any one of claims 1 to 5, wherein the chamfering is performed. 7. The method according to claim 1, wherein the link operation direction of the link mechanism and the pressing direction of the rotary grinding tool against the plate-like work make an angle of approximately 45 degrees with a horizontal plane. A chamfering device for a plate-like work according to the present invention.