JPH05318300A - Glass plate grinding machine - Google Patents

Abstract

PURPOSE:To grind the periphery of a glass plate simply and accurately by furnishing a base actuator coupled with a slide device so that a grinding wheel is pressed resiliently to and supported by the periphery of the glass plate alongside the normal. CONSTITUTION:A grinding wheel 4 mounted on a spindle device 19 is alongside the normal pressed to the periphery of a glass plate 2 by a fluid actuator 22 of a grinder head 3 in the condition that the grinding wheel 4 is held in a certain specified attitude, for example at a certain angle, relative to the peripheral surface of the glass plate 2. An electropneumatic converter 26 varies the air pressure supplied to the fluid actuator 22 in conformity to the signal given by an NC device, and thereby grinding is performed with changing pressing force of the wheel 4 to the peripheral surface of the glass plate.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding method and a grinding machine suitable for grinding the peripheral edges of various shapes of glass plates having corners and corners, such as automobile glass and other shaped glass.

Of course, a circular or square glass plate can be ground easily and accurately.

The present invention also relates to a grinding method and a grinding machine for grinding a working wheel while moving a peripheral edge of a glass plate by a numerical control device (NC device).

In particular, the present invention relates to a grinding method in which a glass plate is set horizontally, and the peripheral edge of the glass plate is moved and cylindrically ground while the machining wheel is maintained at a constant angle with respect to the outer peripheral surface of the glass plate by numerical control. Related to improvement of grinding machines.

While the machining wheel is maintained at a constant angle with respect to the outer peripheral surface of the glass plate by the numerical control as described above,
The applicant, Bando Kiko Co., Ltd., has already developed a machine for moving and grinding the periphery of the glass plate, and has been operating in the US, Europe and Japan.

The present invention is an invention intended to improve the grinding machine by such numerical control.

By the way, even in such a numerically controlled grinding machine, a machine currently used mainly for automobile glass (a processing head is installed at the end of a swinging arm, and a processing wheel rotates horizontally). Whether it is a machine that presses against a plate and grinds it, the processing spindle and the processing wheel are fixedly supported.

[0008] By the way, automobile glass and the like have a complicated shape, and in particular, they suddenly protrude at the corners and corners in a small rounded shape for a long time.

In order to grind such a corner that protrudes with a small radius, the machine speed of any mechanism is greatly reduced and the processing wheel is made to follow the radius.

However, it is no use if the feed speed is reduced so much that it follows the corner radius accurately.

That is, the shape of the rounded shape may be lost or the finished product may not be finished within specified dimensions.

This is because the grinding time is lengthened by the amount by which the feed bead is dropped, and grinding overshoot occurs at this portion.

That is, since the feed speed is slow, the time in which the glass plate is in contact with the processing wheel per unit length of the glass plate becomes long, and the grinding depth becomes deep.

As a matter of course, if the following speed of the processing wheel is increased at the corner rounded portion, it becomes impossible to accurately follow the corner rounded portion, and the shape is deformed due to the grinding and the dimension becomes severe.

In general, the cutting dimension error of automobile glass etc. before the grinding process is ± 0.5 mm with respect to the measurement dimension.
The grinding allowance is about 0.5 mm.

Since the grinding allowance is small as described above, if there is a slight deviation in the positioning setting of the glass plate, there will be a portion where there is unsliding even if the processing wheel is moved to an accurate orbit.

Therefore, the present invention is intended to provide a grinding method and a grinding machine in which the above defects are removed.

According to the present invention, a grinding wheel and a machining spindle equipped with this machining wheel are used in a grinding method in which a peripheral edge of a glass plate is moved and cylindrical grinding is performed by numerically controlling the machining wheel at an outer peripheral surface of the glass plate at a constant angle. A grinding method and a grinding machine, which are pressed against a glass plate by an air float or a fluid float and grind while changing the air pressure or the fluid pressure at a rounded portion or the like.

It is necessary that the air float or the fluid float of the processing wheel and the processing espindle, and the processing wheel as described above always maintain a constant angle with respect to the outer peripheral surface of the glass plate.

A current copying machine (a machining head is installed at the end of a swinging arm, and a machining wheel is pressed against a horizontally rotating glass plate for grinding), or a numerical value for simply moving the periphery of the glass plate. In the controlled grinding machine, since the grinding point on the processing wheel changes in a wide range, the method of pressing the processing wheel against the glass plate is not fixed, and the structure of the air float type or the fluid float type as in the present invention cannot be obtained.

As in the present invention, when the processing wheel keeps a constant angle with respect to the outer peripheral surface of the glass plate, the grinding point on the processing wheel is set at one place and the pressing direction of the processing wheel is set. Can float.

The processing wheel is usually a diamond wheel.

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

Reference numeral 1 is a glass plate grinding machine controlled by a numerical command from a numerical controller.

In this grinding machine 1 shown in this embodiment, the glass plate is moved linearly in one direction (Y-axis movement) to move the processing head 3
While performing a linear motion (X-axis motion) in a direction orthogonal to this to move the processing wheel 4 around the periphery of the glass plate,
Further, the machining head 3 is rotated about a vertical axis with respect to the glass plate surface (swing axis motion) to perform grinding while keeping the processing wheel 4 at a constant angle with respect to the outer peripheral surface of the glass plate 2.

The present invention particularly relates to the improvement of the working head 3 and to the improvement of the grinding operation of the working head 3. Reference numeral 5 is a table for fixing the glass plate 2 and performing one linear movement. The glass plate 2 is horizontally fixed to the glass suction cup 6 of the table 5.

This table 5 is the Y mounted on the machine base 7.
The slide device 8 is supported by the shaft slide device 8.
To move (directly move in the Y-axis direction).

Of course, the table 5 is numerically driven by the Y-axis feed screw device 10 connected to the Y-axis servomotor 9.

Reference numeral 11 is a head stand. This head stand 11
Is installed above the table 5, and the table 5
Performs a linear motion orthogonal to.

The machining head 3 is mounted on the head base 11 as a bearing device.
Is installed through 12.

The head base 11 is also attached to the X-axis slide device 13 mounted on the machine base 7, and moves linearly on the X-axis slide device 13 (directly moves in the X-axis direction).

Of course, the head base 11 is also driven by the X-axis feed screw device 14 connected to the X-axis servomotor 14.

The bearing device 12 mounted on the head base 11 is provided with a rotary shaft 16 incorporated in the up-down direction. The processing head 3 is suspended from the lower part of the rotary shaft 16 and suspended at the upper part. It is connected to a turning axis servomotor 18 via a gear unit 17.

The machining head 3 is horizontally rotated together with the rotary shaft 16 by driving the rotary shaft servomotor 18.

The horizontal rotation is performed by setting the rotary shaft 16 vertically (vertically) on the glass plate surface on the table 5.

By the way, the machining head 3 mainly comprises a spindle device 19 having the machining wheel 4, a slide device 20 to which the spindle device 19 is attached, a machining head main body 21 to which the slide device 20 is attached, The processing head body 21 includes a fluid actuator 22 for advancing and retracting the spindle device 19 and thus the processing wheel 4.

The processing head 3 is provided so that the processing wheel 4 cylindrically grinds the glass plate 2, and the fluid actuator 22 is provided with the processing wheel 4 and the spindle device.
19 is projected toward the glass plate 2 and the processing wheel 4 is pressed against the glass plate.

The spindle device 19 used is a motor spindle 23 having a spindle function and a motor driving the spindle at the same time.

Further, the slide device 20 normally uses a ball slide bearing so as to be moved by a light load of the fluid actuator 22.

Further, the fluid actuator 22 is usually
An air cylinder, especially a low-friction air cylinder (a bellowram cylinder manufactured by Fujikura Rubber Industry Co., Ltd. may be used) is used.

The processing head 3 is fixed to the rotary shaft 16 of the bearing device 12 in the processing head main body 21.

Further, the processing head main body 21 is composed of two orthogonal slide combinations 24 for adjusting the positional movement of the processing wheel 4 and the spindle device 19 with respect to the glass plate 2.

One of them is a cross slide 25A and the other is a cut adjustment slide 25B.
In B, the slide device 20 and the fluid actuator 22 are installed.

The upper part of the cross slide 25A is the rotary shaft 16 described above.
It is fixed to.

In FIG. 1, reference numeral 26 is an electro-pneumatic converter. The electro-pneumatic converter 26 is a device in which the output air pressure changes in proportion to the input current.

In this embodiment, the electro-pneumatic converter 26 is
The "electro-pneumatic converter IT 600 series" manufactured by Sintered Alloy Co., Ltd. or the "electro-pneumatic converter EN30" manufactured by Nippon Regulator Co., Ltd. is used.

According to the "Electro-Pneumatic converter EN30" manufactured by Nippon Regulator Co., Ltd., a mechanism for converting an electric signal into a pneumatic signal and a volume booster for ensuring a necessary pressure are built in, and the electric signal is converted into a pneumatic signal. The mechanism for converting into a signal is composed of a moving coil that can move freely in a magnetic field, a nozzle and a flapper.

When a current flows through the moving coil, a force proportional to the current is generated, the gap between the nozzle and the flapper is narrowed, and the nozzle back pressure rises.

The back pressure of the nozzle back pressure and the thrust of the moving coil balance at a certain displacement point. That is, the nozzle back pressure is proportional to the electric signal.

The nozzle back pressure is used as a pilot pressure to amplify the pressure to obtain an output.

Now, as shown in the figure, this electro-pneumatic converter
The original air pressure is supplied to 26, the secondary air pressure controlled by the electro-pneumatic converter 26 is transmitted to the fluid actuator 22, and the pressing force of the fluid actuator 22 is controlled and changed.

The signal current input to the electro-pneumatic converter 26 is produced by the current converter 27 and is transmitted.

The current converter 27 interfaces with the auxiliary function section of the numerical controller 28 for controlling the machine body, receives a plurality of auxiliary function signals, and produces a plurality of input current levels. This current converter 27 is usually of variable resistance type or D / A conversion type.

Normally, the above-mentioned fluid actuator 22
Although an air cylinder is used as the above, depending on the case, the secondary air pressure output from the electro-pneumatic converter 26 is connected to a low hydraulic pressure converter (air-hydro unit) to convert it to a hydraulic pressure of the same pressure. It may be transmitted to the fluid actuator 22.

Therefore, the fluid actuator is used instead of the air cylinder.

As another example, the electro-pneumatic converter 26 may be connected to another controller for operation without being connected to the numerical controller 26. That is, another controller,
It may be connected to a controller, an operational amplifier or the like and operated separately.

Grinding operation in the present grinding machine.

The glass plate 2 fixed on the table 5 is united with the table 5 to perform a numerically controlled orthogonal linear motion between the glass plate 2 and the processing head 3 to move the processing wheel 4 to the periphery of the glass plate. While moving, the machining head 3 is simultaneously rotated horizontally by numerical control, and the machining wheel 4 is rotated at a constant angle with respect to the outer peripheral surface of the glass plate 2 (normally, the machining wheel 4 is aligned on the normal line of the outer peripheral surface). In this state, the spindle device 19 and even the processing wheel 4 are held by the fluid actuator 22 of the processing head 3.
Is a mechanism of an air float or a fluid float that is pressed against the glass plate 2, and the electro-pneumatic converter 26 changes the air pressure supplied to the fluid actuator 22 by a signal from the numerical control device 28 to change the machining wheel 4 Grinding while changing the pressing force against the glass plate.

The air pressure is changed by, for example, the processing wheel 4 changing the central straight line of the glass plate to be strong and the angle to be weak to grind.

The feed angle of the processing wheel is normally lowered by the angle of the small protruding radius, but at the same time, the fluid pressure is weakened.

That is, the cutting pressure of the processing wheel 4 is generated, the shape of the processing wheel 4 is deformed, and the dimensional deviation is likely to occur, the fluid pressure is weakened and the pressure load (grinding load) is weakened.

[0062] changes in air pressure, normally, 0.3 kg / cm ² with a fluid actuator over diameter 40mm in the present embodiment ~ 1.5 kg / cm ²
Is.

According to the present invention as described above, (1) the spindle device 19, and thus the processing wheel 4 serves as an air float or a mechanism of a fluid float in which the fluid actuator 22 presses the glass plate 2, and -Because the air pressure is automatically changed by the pneumatic converter 26, the grinding load (float pressure) can be reduced in a place where excessive cutting such as a corner rounded portion is likely to occur or where the shape is easily deformed, and a linear portion can be obtained. You can change it freely, such as by making it stronger with.

For this reason, the grinding depth can be made uniform, the shape is not deformed, and the prescribed dimension is not passed.

(2) The grinding depth is uniform regardless of the feed speed. It is possible to finish within strict dimensional accuracy.

(3) Even if the setting (positioning) of the glass plate is incorrect, there is no residue of rubbing.

(4) The processing wheel 4 is an air float,
Since it is a fluid float, it also has the effect of absorbing vibration. Little chattering.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a grinding machine of the present invention.

FIG. 2 is a side view of the grinding machine of the present invention.

FIG. 3 is a front view of a processing head.

FIG. 4 is a side view of a processing head.

FIG. 5 is a plan view of the processing head during grinding.

FIG. 6 is a connection diagram from an electro-pneumatic converter to a fluid actuator.

[Explanation of symbols]

 1 Grinding Machine 2 Glass Plate 3 Processing Head 4 Processing Wheel 5 Table 6 Sucker 7 Machine Stand 8 Y-axis Sliding Device 9 Y-axis Servo Motor 10 Y-axis Feed Screw Device 11 Head Stand 12 Bearing Device 13 X-axis Sliding Device 14 X-axis Servo Device Motor 15 X-axis feed screw device 16 Rotating shaft 17 Gear device 18 Pivoting axis servo motor 19 Spindle device 20 Sliding device 21 Processing head body 22 Fluid actuator 23 Motor spindle 24 Orthogonal slide combination 25A Cross slide 25B Cutting adjustment slide 26 Electro-pneumatic Converter 27 Current converter 28 Numerical control device

[Procedure amendment]

[Submission date] November 15, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Glass plate grinding machine

[Claims]

The present invention relates to a glass sheet grinding machine.

INDUSTRIAL APPLICABILITY The present invention can be applied to a grinding machine suitable for grinding the periphery of glass plates of various shapes having corners and corners such as automobile glass and other shaped glass.

Of course, a circular or square glass plate can be ground easily and accurately.

The present invention can also be applied to a grinding machine that grinds a processing wheel while moving the peripheral edge of a glass plate by a numerical control device (NC device).

Particularly, in the present invention, the glass plate is set horizontally, and the machining wheel is numerically controlled to maintain a predetermined posture, for example, a constant angle, with respect to the outer peripheral surface of the peripheral edge of the glass plate, while maintaining the peripheral edge of the glass plate. It can be applied to a grinding machine that moves along a part and performs cylindrical grinding.

Incidentally, as described above, a machine for moving and grinding the processing wheel along the peripheral edge of the glass plate while maintaining a constant angle with respect to the outer peripheral surface of the peripheral edge of the glass plate by the numerical control is The applicant, Bando Kiko Co., Ltd., has been developing the world-first, and has been operating in the US, Europe and Japan.

The present invention is intended to improve a grinding machine by such numerical control.

In such a numerically controlled grinding machine developed by the present applicant, or a grinding machine currently mainly used for automobile glass (a machining head is provided at the tip of an arm that performs a swing operation, In a grinding machine in which a processing wheel attached to this processing head rotates in one horizontal plane and is pressed against a glass plate to grind), a processing spindle that rotationally drives the processing wheel and the processing wheel are respectively It is fixedly supported by the processing head.

Further, the cutting dimension error of automobile glass etc. before the grinding process is generally ± 0.5 with respect to the specified dimension.
mm, and the grinding allowance is about 0.5 mm.

Since the grinding allowance is small in this way, if there is any deviation in the positioning setting of the glass plate,
Even if the processing wheel is moved to an accurate track, there is a possibility that there will be some areas where there is unsoiled residue.

Therefore, an object of the present invention is to provide a glass plate grinding machine from which the above-mentioned defects are removed.

According to the present invention, the above object is to provide a table for fixing a glass plate to be ground, a first direction with respect to the table, and a second direction orthogonal to the first direction. With respect to the head base configured to be moved relative to each other by numerical control, and the head capable of being turned by numerical control about a central axis arranged along a third direction orthogonal to the first and second directions. A machining head attached to the table, and a fine adjustment device mounted on the machining head so that the machining head can be finely adjusted in one straight line direction in one plane including the first and second directions. A slide device attached to the fine adjustment device so as to be movable along the one straight line direction, and one straight line direction in which the slide device is movable in a normal direction at a peripheral portion of the glass plate Matched By the turning of the processing head and the relative movement of the head base with respect to the table in the first and second directions respectively, the relative movement along the peripheral portion for grinding the peripheral portion of the glass plate is performed. In order to do so, by moving the processing wheel attached to the slide device and the slide device along the one linear direction, the processing wheel is elastically elastic along the normal direction in the peripheral portion of the glass plate. This is accomplished by a glass plate grinding machine having a gas actuator connected to the slide device for pressure support.

That is, in the grinding machine of the present invention, numerical control is performed to keep the processing wheel along a peripheral edge of the glass plate while maintaining a predetermined posture, that is, a constant angle, with respect to the outer peripheral surface of the peripheral edge of the glass plate. It is a grinding machine that moves and grinds by
The processing wheel is pressed against the peripheral portion of the glass plate by a gas actuator, for example, an air float or a fluid float, and is pressed and supported while elastically applying a pressing force in a gas elastic manner to perform grinding.

As described above, the processing wheel is required to always maintain a constant posture with respect to the outer peripheral surface of the peripheral portion of the glass plate.

The above-mentioned conventional grinding machine in which a processing head is provided at the tip of an arm which swings, and the processing wheel rotates in a horizontal plane and is pressed against a glass plate for grinding, or the peripheral portion of the glass plate. In a conventional numerical control grinding machine that simply moves the grinding wheel, the grinding point on the processing wheel changes in a wide range, so the pressing state of the processing wheel against the glass plate is not fixed, and the air float type like the present invention is used. , The fluid float type structure cannot be applied.

As in the present invention, when the processing wheel maintains a constant posture with respect to the outer peripheral surface of the peripheral edge of the glass plate,
The grinding point on the processing wheel is set in one place, the direction in which the processing wheel is pressed is set, and an air float or a fluid float can be applied.

A diamond wheel is usually used as the processing wheel.

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

Reference numeral 1 is a glass plate grinding machine controlled by a numerical command from a numerical controller.

In this grinding machine 1 shown in this embodiment, the glass plate 2 is moved in one direction (direction perpendicular to the paper surface in FIG. 1).
Along with the linear motion (Y-axis motion), and the machining head 3 along the other direction (left-right direction in FIG. 1) orthogonal to this one direction (X-axis motion). While moving the processing wheel 4 mounted on the processing head 3 via the spindle device 19 along the peripheral edge of the glass plate, the processing head 3 is further moved in a direction orthogonal to each of the one direction and the other direction, that is, A processing wheel 4 is swung about a rotation axis 16 as a central axis arranged in a direction perpendicular to the surface of the glass plate 2 (swing axis movement).
Is configured to perform grinding while maintaining a predetermined posture, for example, a constant angle, with respect to the outer peripheral surface of the peripheral edge of the glass plate 2.

The table 5 which fixes the glass plate 2 and moves linearly in one direction fixes the glass plate 2 horizontally via a glass suction cup 6.

This table 5 is a Y mounted on the machine base 7.
It is supported by a shaft slide device 8 and is directly moved in the Y-axis direction by the slide device 8.

The table 5 is numerically controlled by a Y-axis feed screw device 10 connected to a Y-axis servomotor 9.

Reference numeral 11 is a head stand. This head stand 11
Is mounted above the table 5 by the machine base 7 and performs a linear motion along the other direction orthogonal to the direction of the linear motion of the table 5.

The machining head 3 is mounted on the head base 11 as a bearing device.
Is installed through 12.

The head base 11 is also attached to the X-axis slide device 13 mounted on the machine base 7, and moves linearly on the X-axis slide device 13 in the X-axis direction.

The head base 11 is also numerically driven by an X-axis feed screw device 15 connected to an X-axis servomotor 14.

The bearing device 12 mounted on the head base 11 includes a first bearing device 12 which is orthogonal to the X-axis direction and the Y-axis direction.
The rotary shaft 16 is installed along the vertical direction in the figure, and the processing head 3 is suspended from the lower part of the rotary shaft 16 and the rotary shaft servomotor is mounted on the upper part of the rotary shaft 16 via a gear device 17. It is connected to 18.

The machining head 3 is configured to rotate in the horizontal plane together with the rotary shaft 16 by driving the rotary shaft servomotor 18.

The turning axis servo motor 18 constitutes a drive unit by the Y axis servo motor 9 and the X axis servo motor 14, respectively.

The horizontal rotation is performed by setting the rotary shaft 16 in the vertical direction (vertical) on the surface of the glass plate 2 on the table 5.

By the way, the machining head 3 mainly comprises a spindle device 19 having the machining wheel 4, a slide device 20 to which the spindle device 19 is attached, and a machining head body 21 to which the slide device 20 is attached. Is equipped with
A fluid actuator 22 as a gas actuator for advancing and retracting the machining wheel 4 mounted on the spindle device 19 is mounted on the machining head body 21.

The slide device 20 is mounted on the processing head main body 21 so as to be movable along a straight line direction in a plane including the X-axis direction and the Y-axis direction.

The processing head 3 is so arranged that the processing wheel 4 grinds the peripheral edge of the glass plate 2.
The fluid actuator 22 causes the processing wheel 4 and the spindle device 19 to project in one linear direction toward the outer peripheral surface of the peripheral edge of the glass plate 2 so that the outer peripheral surface of the glass plate 2 receives the elastic force of the gas due to the gas. It is configured to be pressed together.

Therefore, the processing wheel 4 is pressed and supported on the outer peripheral surface of the glass plate 2 while being turned so that the line connecting the center of rotation and the grinding point coincides with the normal direction of the outer peripheral surface of the glass plate 2.

The spindle device 19 uses a motor spindle 23 that simultaneously has the function of a spindle and the function of a motor for driving this spindle.

Further, a ball slide bearing is used as the slide device 20 so that the slide device 20 can move even under a light load of the fluid actuator 22.

Further, the fluid actuator 22 is an air cylinder using gas, particularly an air cylinder which can be operated with low friction (Bellofrum cylinder manufactured by Fujikura Rubber Industry Co., Ltd.).
Is preferably used.

The machining head 3 is fixed to the rotary shaft 16 of the bearing device 12 in the machining head main body 21.

Further, the machining head main body 21 adjusts the positional movement of the machining wheel 4 and the spindle device 19 with respect to the glass plate 2, so that the machining head main body 21 can be slid in two directions orthogonal to each other. The combination 24 is attached.

One of the orthogonal slide combination bodies 24 is a cross slide 25A, and the other is a cut adjustment slide 25B. The slide device 20 is attached to the cut adjustment slide 25B.
And a fluid actuator 22 is mounted.

The upper part of the cross slide 25A is the rotary shaft 16 described above.
It is fixed to.

In FIG. 1, reference numeral 26 is an electro-pneumatic converter. The electro-pneumatic converter 26 is a device configured so that the output air pressure changes in proportion to the input current.

In this embodiment, the electro-pneumatic converter 26 is
The "electro-pneumatic converter IT 600 series" manufactured by Sintered Alloy Co., Ltd. or the "electro-pneumatic converter EN30" manufactured by Nippon Regulator Co., Ltd. is used.

According to the "Electro-Pneumatic Converter EN30" manufactured by Nippon Regulator Co., Ltd., a mechanism for converting an electric signal into a pneumatic signal and a volume booster for ensuring a necessary pressure are built in, and the electric signal is converted into a pneumatic signal. The mechanism for converting into a signal is composed of a moving coil that can move freely in a magnetic field, a nozzle and a flapper.

When a current flows through the moving coil, a force proportional to the current is generated, the gap between the nozzle and the flapper is narrowed, and the nozzle back pressure is increased.

The back pressure of the nozzle and the thrust of the moving coil are balanced at a certain displacement point. That is, the nozzle back pressure is proportional to the electric signal.

This nozzle back pressure is used as a pilot pressure to amplify the pressure and obtain an output.

As shown in FIG. 6, the electro-pneumatic converter 26 supplies the original air pressure to the electro-pneumatic converter 26, and the secondary air pressure controlled by the electro-pneumatic converter 26 is supplied to the fluid actuator. The pressure is transmitted to the fluid actuator 22, and the pressing force of the fluid actuator 22 is controlled and changed. The signal current input to the electro-pneumatic converter 26 is ordered by the current converter 27 and transmitted.

The current converter 27 is configured to interface with an auxiliary function section of the numerical controller 28 for controlling the main body of the grinding machine, receive a plurality of auxiliary function signals, and generate an input current in a plurality of steps. There is.

This current converter 27 is generally of a variable resistance type, a D / A conversion type or the like.

An air cylinder is generally used as the fluid actuator 22.

As another example, the electro-pneumatic converter 26
May be connected to a controller, a controller, an operational amplifier or the like as another control device without being connected to the numerical control device 26, and may be operated separately.

The grinding operation in the glass plate grinding machine according to the present invention will be described below.

The glass plate 2 fixed on the table 5 is
Along with the table 5, a numerically controlled relative linear motion in two mutually orthogonal directions is performed with respect to the machining head 3 to move the machining wheel 4 along the peripheral edge of the glass plate 2. At the same time, however, the machining head 3 is simultaneously caused to perform a turning by a numerical control, that is, a horizontal turning.

The processing wheel 4 has a constant posture with respect to the outer peripheral surface of the peripheral edge of the glass plate 2, for example, a constant angle (the line connecting the rotation center of the processing wheel 4 and the grinding point is on the normal line of the outer peripheral surface). ) Is maintained in this state, the processing wheel 4 mounted on the spindle device 19 is pressed against the outer peripheral surface of the glass plate 2 by the fluid actuator 22 of the processing head 3 along the normal line direction, and electro-pneumatic The converter 26 changes the air pressure supplied to the fluid actuator 22 in response to a signal from the numerical controller 28, and changes the pressing force of the processing wheel 4 against the outer peripheral surface of the glass plate to perform grinding.

The air pressure is changed, for example, by changing the processing wheel 4 so that the straight line at the center of the glass plate is strong and weak at the corners.

At an extremely small radius,
Normally, the feed speed of the processing wheel is reduced, but at the same time, the fluid pressure is weakened.

That is, the cutting pressure of the processing wheel 4 is generated, the shape of the processing wheel 4 is deformed, and the pressure of the grinding wheel 4 is weakened by weakening the fluid pressure at the place where the specified dimension is easily passed.

[0059] The air pressure changes, the diameter of the fluid actuator is 0.3kg / cm ² ~1.5kg / cm ² at 40mm in the present embodiment.

According to this embodiment as described above, (1) the processing wheel 4 mounted on the spindle device 19 is pressed against the glass plate 2 by the fluid actuator 22;
In addition, since the air pressure is automatically changed by the electro-pneumatic converter 26, the grinding load (float pressure) is applied at a place where excessive cutting such as a rounded portion of a corner is apt to occur or where the shape is easily deformed. The size can be made smaller, the straight part can be made stronger, and so on.

Therefore, the grinding depth can be made uniform, the shape is not deformed, and the specified dimension is not passed.

(2) The grinding depth is uniform regardless of the feed speed. Can be finished with high dimensional accuracy.

(3) Even if there is a deviation in the setting (positioning) of the glass plate, it is possible to prevent the occurrence of unscraped residue.

(4) The processing wheel 4 is an air float,
Since it is a fluid float, it also has the effect of absorbing vibration and less chattering.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a grinding machine of the present invention.

FIG. 2 is a side view of the grinding machine of the present invention.

FIG. 3 is a front view of a processing head.

FIG. 4 is a side view of a processing head.

FIG. 5 is a plan view of the processing head during grinding.

FIG. 6 is a connection diagram from an electro-pneumatic converter to a fluid actuator.

[Explanation of symbols] 1 grinding machine 2 glass plate 3 processing head 4 processing wheel 5 table 6 suction cup 7 machine base 8 Y-axis slide device 9 Y-axis servo motor 10 Y-axis feed screw device 11 head base 12 bearing device 13 X-axis slide Device 14 X-axis servo motor 15 X-axis feed screw device 16 Rotation shaft 17 Gear device 18 Swivel axis servo motor 19 Spindle device 20 Sliding device 21 Machining head body 22 Fluid actuator 23 Motor spindle 24 Orthogonal slide combination 25A Cross slide 25B Notch Adjustment slide 26 Electro-pneumatic converter 27 Current converter 28 Numerical control device

Claims (2)

[Claims] 1. A step of numerically controlling a machining wheel for grinding a peripheral end face of a glass plate while relatively moving the peripheral wheel along the peripheral end face, and grinding the peripheral end face, and during the grinding, the machining wheel of the machining wheel is controlled. And a step of controlling the pressing force applied to the peripheral edge surface to be constant. 2. A table for fixing a glass plate to be ground, and a relative movement relative to the table with respect to each of a first direction and a second direction orthogonal to the first direction by numerical control. A configured head stand, and the first
And a machining head mounted on the head base so as to be rotated by numerical control about a central axis arranged along a third direction orthogonal to the second direction, the rotation of the machining head, and the machining head. A machining wheel attached to the machining head so as to relatively move along the peripheral end face of the glass plate for grinding the peripheral end face of the glass plate by the relative movement of the head base relative to the table in the first and second directions, respectively.
A glass plate grinding machine having a fluid actuator connected to the processing wheel so as to control the pressing force applied to the peripheral end surface of the glass plate of the processing wheel to be constant.