JPH02152757A - Drilling and chamfering method - Google Patents

Abstract

PURPOSE:To increase the perforating and beveling efficiencies of a glass pane, etc., by forming the both ends of the grindstone in the diameter smaller than bore diameter, for example, making it movable in Z direction and adding a slider function moving in parallel to the face of the glass pane. CONSTITUTION:After moving a spindle motor 21 and grindstone 3 to just above the perforating position of a glass pane 1 the grindstone 3 is rotated by a motor 21, moved downward via a slider and a hole is worked. A supporting base 8 can be moved in Y direction via a screw 73 and nut 74 by the motor 76 fixed to a base 71 and in X direction via a screw 63, nut 64 by the motor 66 fixed to a base 61, so the hole and grindstone 3 rotating centers are made eccentric and the beveling of the lower face of the glass pane 1 is performed. The centers of the hole and grindstone 3 are made the same and after pulling up the grindstone 3 the centers of the hole and grindstone 3 are made eccentric and the beveling of the glass pane 1 upper face is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for drilling and chamfering hard and brittle plates such as ceramic plates and glass plates.

[Prior Art] Temporary glass is widely used as a functional structural material, and is also used in large quantities as window glass for vehicles.

For example, in the case of a passenger, window glass is fixed by drilling holes in the glass, fixing metal fittings with bolts, and secondarily attaching it to the body or door, or attaching a mechanism for opening and closing the glass.

Conventionally, the holes are processed by grinding, but
At that time, if you leave the hole as a straight hole (if you tighten the fixing bracket with the bolt, stress will be concentrated on the edge of the hole end, causing minute cracks, and if you use it in that state, it will cause a relatively weak impact). There was a problem that the entire glass would crack, making it not only unusable (but also dangerous).Also, when drilling straight holes, there was a problem that cracks would appear on the edge of the end face just before the process was completed. Therefore, a method of chamfering the edges of both sides of temporary glass has been used.

The method is shown in FIG. In this method, spindle motors 21, 22, and 23 are provided on the upper and lower sides of the glass plate 1 to be drilled, along the feeding direction of the glass plate 1 and perpendicular to the surface, and the grinding wheels 311 and 23 are installed using chucks 211, 212, and 213, respectively.
312 and 313 are fixed and made to face the plate glass.

The grindstone 311 is fixed by gripping the grindstone shaft 301 by a chuck 211, and is rotatable by the spindle motor 21.

The shape of the whetstone is from the tip to a flat or conical tip 3.
311 and a cylindrical part 321, and the cylindrical part 3 is used for hole drilling.
21 is used.

On the other hand, the grindstones 312, 313 are fixed by gripping the grindstone shafts 302, 303 by the chucks 212, 213, and are rotated by the spindle motors 22, 23.

The cylindrical portion 32 has a tip tapered portion 332, 333 for surface trimming at the tip, and has a larger diameter than the cylindrical portion 321 for hole machining.
Continued to 2,323.

These two spindles 22 and 23 perform surface trimming of the upper and lower surfaces of the temporary glass l, and the tapered tip portions 332 and 333
used only.

In the processing order, the first spindle motor 21 moves up and down to machine the hole, and the temporary glass is sent to the right so that the machined hole is located directly below the second spindle motor 22.

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

This method eliminates cracking on the end face of the hole and improves yield.

[A problem that the invention attempts to solve]

Although the above method has improved the yield, it requires spindle motors to be placed above and below the sheet glass along the feeding direction of the temporary glass, and because a head is provided to mount and fix the spindle motor, space efficiency is extremely low. It was bad.

Furthermore, since it is necessary to position the processing position directly in front of each spindle, time is required for positioning, which has the disadvantage of lowering production efficiency.

[Means for Solving the Problem] A first method according to the present invention is to spin a grinding tool capable of chamfering the upper and lower surfaces, for example, a grinding tool with tapered ends of the grindstone having a diameter smaller than the diameter of the through hole. A slider function such as an X-Y table is added that allows the motor to move parallel to the surface of the glass plate using a guide that is movable in the Z direction.

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

By doing this, the above-mentioned processing can be performed using one spindle motor and one grindstone.

[For production]

According to method 2, after drilling the hole, the grinding wheel can be moved in a circular motion in a plane parallel to the surface of the plate glass, making it possible to perform top chamfering and bottom chamfering with a single spindle motor. be.

〔Example〕

The method according to the invention will be explained below with reference to the figures.

1 and 2 show a first embodiment of the present invention.

In the figure, the same reference numerals as above indicate the same contents.

The grinding wheel 3 has a tapered end portion 332, a cylindrical portion 321, and a second tapered portion 34, and is attached to the chuck 2 via the grinding wheel shaft 301.
11 is fixed.

Regarding the size of the grindstone 3, the diameter of the hole machining corresponds to the diameter of the cylindrical portion 321.

The spindle motor 21 is installed above the temporary glass 1, perpendicular to the surface of the glass plate 1 with the grindstone 3 facing down. Figure 2 shows this viewed from above, and the motor 21 is connected to the support base 8.
and is supported by the second slider 7 and the first slider 6 so as to be movable in a plane parallel to the plane of the glass plate 1.

Furthermore, a Z-direction slider that enables movement in the rotational axis direction in order to bring the grindstone 3 closer to or away from the temporary glass is also provided, but this is omitted.

The second slider 7 is connected to a motor 7 fixed to a base 71.
6 and a base side bearing 72 rotatably support the screw thread 73. The slider side bearing 7 is mounted on the support base 8.
5 and a screw nut 74 are fixed, the former is rotatably and axially movably connected to the screw thread 73, and the latter constitutes a screw with the screw thread 73.

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

The base 71 of the second slider 7 has a slider side bearing 65.
and a screw nut 64 are fixed, the former being rotatably and axially movably connected to the screw thread 63, and the latter forming a thread with the screw thread 63.

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

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

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

Next, the operation will be explained.

First, as shown in FIG. 1, the spindle motor 21 and the grindstone 3 are brought up to just above the hole drilling position of the temporary glass 1, and then the grindstone 3 is rotated by the spindle motor 21. (1st
Step) Next, the third slider is activated to move the spindle motor 2 downward to form the hole. (Second step) Next, the center of the hole 5 and the rotation center of the grindstone 3 are made eccentric, and the bottom surface of the glass plate 1 is chamfered (third step).
...See Fig. 3 Next, align the center of the hole 5 with the center of the grindstone 3, and pull up the grindstone 3 through the hole 5. (Fourth step) Next, the center of the hole 5 and the center of the grinding wheel 3 are made eccentric, and the upper surface of the glass plate l is chamfered at part a (fifth step)...See Fig. 4 Next, the second embodiment I will explain about it.

Figure 5 shows a spindle motor 2 using magnetic bearings.
A chuck 211 is fixed to the tip of the shaft 11, and grips the whetstone shaft 301 to hold the whetstone 3.

The shaft 11 is supported in a non-contact manner in the radial direction by a first magnetic bearing 91 and a second magnetic bearing 92, and rotational torque is applied by the motor section 10 located between them.

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

First magnetic bearing 91, motor section 10, second magnetic bearing 9
2 has a stator 912.10 on the frame 12 side, respectively.
2°922 is fixed, and the rotor 911 is attached to the shaft 11 side.
, 101°921 are fixed. And it can be rotated.

These magnetic bearings are controlled by a magnetic bearing controller 13 and held at a given floating position. Its floating position is given by the command device 14.

Here, since the operation is the same as that of the first embodiment except for making the grindstone 3 perform a circular motion, the explanation will be omitted, and only the operation for making the grindstone 3 perform a circular motion will be explained.

FIG. 6 shows the control axes of the magnetic bearing by extracting only the rotating portion of FIG. 5, with the two axes pointing downward, the X axis pointing to the right, and the y axis perpendicular to the plane of the paper.

When a command is given to the magnetic bearing controller 13 by the command device 14, the position of the shaft of the bearing portion is constantly followed. Therefore, the displacement commands for the first bearing 91 in the X direction and the X direction and the second bearing 92 in the X direction and the X direction are
os(ωt), 5in(ωt), cos(ωt+π
)+5in(ωt+π).

Here, ω is an angular velocity that rotates the position of the shaft of the bearing portion once.

At this time, if the distance between the grinding wheel 3 and the first bearing 91, and the distance between the first bearing 91 and the second bearing 92 is Iz, then χ of the grinding wheel,
The displacement in the y direction is as follows, and it describes a circular motion (Figure 7).

When the amount of displacement can be made small, the x and y direction displacement commands for both the first bearing 91 and the second bearing 92 are set to cos (ωt
), 5in(ωt), the displacement of the grinding wheel will similarly be cos(ωt), 5in(ωt).

In this way, in the second embodiment, if the command device gives a floating position command to the magnetic bearing controller and causes it to draw a circle, the grinding wheel 3 will also draw a circle, so the entire spindle motor can be moved parallel to the surface of the plate glass. It is unnecessary to move within a plane.

As a third embodiment, an example will be shown in which a spindle motor is held by a robot and processed.

The type of robot is not limited as long as it moves in the same way as the two embodiments described above. It consists of a robot body, its controller, an end effect of the robot hand, and a spindle held by it.

The processing procedure is the same as in the first and second embodiments, but
The circular or conical motion is made by the movement of the robot hand. If the spindle motor uses a magnetic bearing, the robot hand moves it to the processing position.
The chamfering process is performed in the same manner as in the second embodiment.

〔Effect of the invention〕

As described above, according to the present invention, only one spindle motor and one grindstone are required for chamfering after hole drilling, thereby improving the space efficiency of the processing line. In the case of the second embodiment, since sliders in the x and y directions are not required, the space efficiency is even better, and the grinding wheel can be given fine movement and high-speed rotation is possible, which increases production efficiency. It has the advantages of both.

In addition, in the two examples, the spindle motor was placed above the plate glass, but it goes without saying that it may be placed below.
The direction of the plate glass is also arbitrary.

It goes without saying that the processing content is not limited to countersinking, and the material is not limited to glass.

[Brief explanation of the drawing]

Fig. 1 is a side view of the first embodiment of the present invention, Fig. 2 is a plan view thereof, Figs. 6 is a side view of only the rotating part of the spindle motor, FIG. 7 is an explanatory diagram of the operation of the spindle motor in the second embodiment, and FIG. 8 is an explanatory diagram of the conventional drilling method. It is. 1... Temporary glass 2.21, 22.23... Spindle motor 211
, 212.213...Chuck 301.302,30
3...Whetstone shaft 3.311, 312.313...Whetstone 321.322
．． 323... Cylindrical part 331... Tip part 332. 333... Tip tapered part 5... Hole 6... First slider 61.71 62.72 63.73 64.74 65.75 66 , 76 911.101,921 912.102,922...Second slider...Base...Base side bearing...Screw screw...Screw nut...Slider side bearing...Motor... ...Support stand...First magnetic bearing...Rotor...Stator...Second magnetic bearing...Motor section...Shaft...Frame...Magnetic bearing controller... command device

Claims (5)

[Claims] (1) A grinding method in which a grinding wheel is fixed to the shaft end of a spindle motor, and is characterized in that processing is performed using the front end surface, outer peripheral surface, and rear surface of the grinding wheel in the axial direction. Drilling and chamfering method. (2) The method for drilling and rounding a hole according to claim 1, wherein the outer circumferential surface is drilled, and the front end side surface and the rear side surface in the axial direction are chamfered. (3) The drilling and chamfering method according to claim 1 or 2, wherein the chamfering process is performed by moving a spindle motor in a plane perpendicular to the rotation axis. (4) The drilling and chamfering method according to claim 1 or 2, wherein the chamfering process is performed by tilting the rotating shaft of the spindle motor and causing it to move conically. (5) The drilling and chamfering method according to claim 4, which uses a magnetic bearing.