JPH0798304B2 - Drilling and chamfering method - Google Patents

Description

The present invention relates to a method for punching and chamfering a hard and brittle plate such as a ceramic plate or a glass plate.

[Conventional technology]

Flat glass is widely used as a functional structural material, and is also used in large quantities as vehicle window glass. For example, in the case of passenger cars, holes are made in the glass as a method of fixing the window glass,
Metal fittings are fixed with bolts, and they are secondarily attached to bodies and doors, and glass opening / closing mechanisms are attached.

The hole processing is conventionally performed by grinding,
At that time, if the hole is left as a straight hole, when tightening the fixing bracket with a bolt, stress concentrates on the edge part of the hole end face and causes minute cracks. There was a problem that not only the entire structure was cracked and it became unusable but also it became dangerous. In addition, when machining a straight hole, there was a problem that the edge edge portion was cracked immediately before the completion of the machining. Therefore, a method has been used in which chamfering is applied to both ends of the plate glass.

The method is shown in FIG. In this method, on the upper and lower sides of the plate glass 1 to be drilled, spindle motors 21, 22, 23 are provided vertically along the surface along the feed direction of the plate glass 1, and the grindstones 311, 312, 313 are fixed using chucks 211, 212, 213,
It is facing the plate glass.

The grindstone 311 holds the grindstone shaft 301 by the chuck 211 and fixes it.
Spindle motor 21 allows rotation.

The shape of the grindstone is a flat or conical tip 33 from the tip.
1 has a cylindrical portion 321, and the cylindrical portion 321 is used for drilling.

On the other hand, in the grindstones 312 and 313, the chucks 212 and 213 have grindstone shafts 302 and 303.
It is grasped and fixed, and is rotated by spindle motors 22 and 23.

The tip has tapered tip parts 332, 333 for surface trimming,
Following the cylindrical parts 322, 323 having a diameter larger than that of the hole forming cylindrical part 321.

With these two spindles 22 and 23, the upper and lower surfaces of the glass sheet 1 are subjected to surface trimming, and only the tip tapered portions 332 and 333 are used.

The processing order is that the first spindle motor 21 moves up and down to perform hole processing, the plate glass is sent to the right side, and the processed hole comes directly below the second spindle motor 22.

Next, the second spindle motor 22 moves up and down to perform the first surface trimming, the plate glass 1 is further sent to the right side, and the third spindle motor 23 similarly performs the second surface trimming.

By such a method, the cracks on the end faces of the holes are eliminated, and the yield is improved.

[Problems to be solved by the invention]

Although the yield was improved by the above method, the spindle motor had to be arranged along the feed direction of the plate glass on the upper side and the lower side of the plate glass, and since the head for mounting and fixing the spindle motor was provided, the space bone ratio was extremely high. It was bad.
Further, since it is necessary to position the machining position directly in front of each spindle, there is a drawback that time for positioning is required and production efficiency is lowered.

[Means for solving problems]

A first method according to the present invention is to use a grindstone capable of chamfering the upper and lower surfaces, for example, a grinding tool in which both ends of a grindstone having a diameter smaller than the diameter of a through hole are tapered so that a spindle motor can be moved in the Z direction. Thus, a slider function such as an XY table that enables movement parallel to the surface of the plate glass is added.

In the second method, a magnetic bearing is used for the spindle motor, and a command device for giving a holding position command for the two radial bearings is used for the bearing controller.

By doing so, one spindle motor and one grindstone can perform the processing.

[Work]

According to such a method, since the grindstone can be moved circularly in the plane parallel to the surface of the plate glass after the hole processing, the upper surface chamfering processing and the lower surface chamfering processing can be performed by one spindle motor. .

〔Example〕

 The method according to the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention. In the figure,
The same symbols as those used above indicate the same contents.

The grindstone 3 has a tip tapered portion 332, a cylindrical portion 321, and a second tapered portion 34, and the chuck 211 is fixed via a grindstone shaft 301.

The size of the grindstone 3 corresponds to the diameter of the hole processing and the diameter of the cylindrical portion 321.

The spindle motor 21 is installed on the upper side of the plate glass 1 and with the grindstone 3 down, perpendicularly to the surface of the plate glass. This is seen from above in FIG. 2, and the motor 21 is fixed by the support base 8, and the second slider 7 and the first slider 6 enable movement within a plane parallel to the plane of the plate glass 1. Is supported. Further, a Z-direction slider that enables movement in the rotation axis direction to bring the grindstone 3 closer to or farther from the plate glass is also provided, but is omitted.

The second slider 7 rotatably supports a screw screw 73 by a motor 76 fixed to a base 71 and a base side bearing 72. A slider side bearing 75 and a screw nut 74 are fixed to the support base 8, the former is connected with a screw screw 73 so as to be rotatable and axially movable, and the latter constitutes a screw screw 73 and a screw.

Therefore, the spindle motor 2 can be moved up and down on the paper surface of FIG. 2 by the movement of the motor 76. First
The slider 6 rotatably supports a screw screw 63 by a motor 66 fixed to a base 61 and a base side bearing 62.

A slider side bearing 65 and a screw nut 64 are fixed to the base 71 of the second slider 7, and the former is a screw screw 63.
Is rotatably and axially movably connected, and the latter constitutes a screw screw 63 and a screw.

Therefore, by the action of the motor 66, the spindle motor can be moved left and right on the paper surface of FIG.

In this way, the support base 8 can be finely moved within the XY plane.

In addition to the above-mentioned configuration, there is an NC device (not shown) that operates three sliders, and its function enables the grindstone 3 of the spindle motor 2 to move three-dimensionally.

Next, the operation will be described.

First, as shown in FIG. 1, the spindle motor 21 and the grindstone 3 are brought to just above the hole processing position of the plate glass 1, and then the grindstone 3 is rotated by the spindle motor 21. (First Step) Next, the third slider is made to work to move the spindle motor 2 downward to make a hole. (Second step) Next, the center of the hole 5 and the rotation center of the grindstone 3 are eccentric to chamfer the lower surface b of the plate glass 1 (third step) ... See FIG. The centers are made the same, and the grindstone 3 is pulled up through the hole 5. (Fourth step) Next, the center of the hole 5 and the center of the grindstone 3 are eccentric to chamfer the a portion of the upper surface of the plate glass 1 (fifth step) ... See FIG. 4. Next, a second embodiment will be described. To do.

FIG. 5 shows a spindle motor 2 using a magnetic bearing,
A chuck 211 is fixed to the tip portion of the shaft 11, and the grindstone 3 is held by the grindstone shaft 301.

The shaft 11 is supported in non-contact with the first magnetic bearing 91 and the second magnetic bearing 92 in the radial direction, and the motor unit 10 in the middle thereof is supported.
The rotational torque is applied at.

A thrust bearing is provided above the second magnetic bearing 92, and the thrust direction is supported in a non-contact manner, but is not shown.

The first magnetic bearing 91, the motor unit 10, and the second magnetic bearing 92 are
The stators 912, 102, 922 are fixed to the frame 12 side, and the rotors 911, 101, 921 are fixed to the shaft 11 side. And it is rotatable.

These magnetic bearings are controlled by the magnetic bearing controller 13 and are held at given levitation positions. The flying position is given by the command device 14.

The operation is the same as that of the first embodiment except that the grindstone 3 is circularly moved, and therefore the description thereof is omitted. Only the point of causing the grindstone 3 to circularly move will be described.

FIG. 6 shows the control shaft of the magnetic bearing by taking out only the rotating portion of FIG. 5, where the downward direction is the z axis and the rightward direction is the x axis.
The y-axis is the direction perpendicular to the axis and the paper surface.

The position of the shaft of the bearing unit steadily follows the command given by the command device 14 to the magnetic bearing controller 13. Therefore, the displacement commands of the first bearing 91 in the x direction and the y direction and the displacement commands of the second bearing 92 in the x direction and the y direction are cos (ω
t), sin (ωt), cos (ωt + π), sin (ωt + π).

Here, ω is an angle for rotating the shaft of the bearing portion once.

At this time, if the distances between the grindstone 3 and the first bearing 91 and between the first bearing 91 and the second bearing 92 are l ₁ and l ₂ , the displacement of the grindstone in the x and y directions is And draw a circular motion (Fig. 7).

When the amount of displacement can be reduced, both the first bearing 91 and the second bearing 92 use x, y direction displacement commands as cos (ωt), sin (ω
If given by t), the displacement of the grindstone is also cos (ωt), sin
(Ωt).

As described above, in the second embodiment, if the commanding device gives a floating position command to the magnetic bearing controller so that it draws a circle, the grindstone 3 also draws a circle, so that the entire spindle motor is parallel to the surface of the sheet glass. It is unnecessary to move it in a plane.

As a third embodiment, an example in which a spindle motor is held by a robot and processing is performed will be described.

The type of robot is not limited as long as it can move in the same manner as the two embodiments. It consists of the robot body, its controller, robot hand end effects, and the spindle held by it.

The processing procedure is the same as in the first and second embodiments,
The circular movement or the conical movement is performed by the movement of the robot hand. If the spindle motor uses magnetic bearings, the robot hand moves to the machining position,
The chamfering process is performed by the same method as in the second embodiment.

〔The invention's effect〕

As described above, according to the present invention, only one spindle motor and one grindstone are required to perform the chamfering process after drilling, so that the space efficiency of the processing line is improved. In the case of the second embodiment, since the sliders in the x direction and the y direction are unnecessary, the space efficiency is further improved, fine movement can be given to the grindstone, and high-speed rotation is possible, so that the production efficiency is improved. It also has the advantages.

Although the spindle motor is arranged above the plate glass in the two embodiments, it goes without saying that the spindle motor may be arranged below.
The direction of the plate glass is also arbitrary.

Needless to say, the processing content is not limited to countersink processing and the material is not limited to glass.

[Brief description of drawings]

FIG. 1 is a side view of the first embodiment of the present invention, FIG. 2 is a plan view thereof, FIGS. 3 and 4 are operation explanatory views, and FIG. 5 is a magnetic bearing used in the second embodiment. FIG. 6 is a side view of only the rotating portion of the spindle motor, FIG. 7 is an operation explanatory view of the spindle motor in the second embodiment, and FIG. 8 is an explanatory view of a conventional drilling method. Is. 1 …… Sheet glass 2,21,22,23 …… Spindle motor 211,212,213 …… Chuck 301,302,303 …… Whetstone shaft 3,311,312,313 …… Whetstone 321,322,323 …… Cylindrical part 331 …… Tip 332,333 …… Tip taper 5 …… Hole 6… … First slider 7 …… Second slider 61,71 …… Base 62,72 …… Base side bearing 63,73 …… Screw screw 64,74 …… Screw nut 65,75 …… Slider side bearing 66, 76 …… Motor 8 …… Support base 91 …… First magnetic bearing 911,101,921 …… Rotor 912,102,922 …… Stator 92 …… Second magnetic bearing 10 …… Motor part 11 …… Shaft 12 …… Frame 13 …… Magnetic Bearing controller 14 ... Commanding device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Fujiki 1-6-1, Otemachi, Chiyoda-ku, Tokyo Yasukawa Electric Co., Ltd. Tokyo branch office (56) References U)

Claims (5)

[Claims] 1. A drilling and chamfering method for fixing a grinding wheel to the shaft end of a spindle motor for machining, using the surface on the tip side of the grinding wheel, the outer peripheral surface and the surface on the rear side in the axial direction. A method of drilling and chamfering that is characterized by that. 2. The drilling and chamfering method according to claim 1, wherein the diameter is made smaller than the diameter of the through hole and the grinding is performed with a grinding wheel having tapered both ends. 3. The drilling and chamfering method according to claim 1, wherein the outer peripheral surface is holed, and the front end surface and the axial rear surface are chamfered. 4. The method of boring and chamfering according to claim 1, wherein, when chamfering, the spindle motor is moved within a plane perpendicular to the rotation axis for machining. 5. The method of boring and chamfering according to claim 1, wherein, when the chamfering is performed, the rotary shaft of the spindle motor is tilted to perform a conical movement.