JPS6284963A - Numerically controlled sheet glass grinding device - Google Patents

Abstract

PURPOSE:To facilitate the positional control of a grindstone after the latter being worn, to prevent excessive cutting, by conducting such a control that the line normal to a peripheral shape, passing through a grinding point, is made to be coincident with the straight line connecting between the grinding point and the rotating center of a machining wheel together with the control of pressing force for grinding. CONSTITUTION:The turn angle of a machining wheel 7 is numerically controlled in such a way that the line normal to the outer peripheral shape of a glass sheet 8, passing through a grinding point A is made to be coincident with the straight line connecting between the grinding point A and the rotating center 41 of the machining wheel 7. Further, the pressure of secondary air fed to an actuator 46 is changed to control pressing force for grinding against the glass sheet 8 on the machining wheel 7. Then, during adjustment of setting position of the wheel 7 which has been worn, the adjustment may be attained by displacing the wheel 7 in only one direction by means of a cut-in direction adjusting slide 42 so that the grinding point is made to be coincident with the turning axis of the wheel, and therefore the control is simple. Further, it is possible to prevent excessive cutting when the feed rate of the wheel 7 is made to be low at a corner section, or the like of the glass sheet where the radius of curvature is less, by controlling the pressing force for grinding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate glass grinding machine using a numerical control system that grinds the peripheral edge of a plate glass while moving a processing wheel along the peripheral edge of the plate glass under numerical control.

In conventional flat glass grinding machines, which use numerical control to move the processing wheel along the periphery of the glass sheet and grind it, the radius of curvature is extremely small because the processing wheel is fixedly supported. When the feed speed of the machining wheel is slowed down at corners, etc., it is easy to cause excessive cutting in the grinding process, and it is difficult to adjust the position of the machining wheel when the grinding wheel of the machining wheel wears out. isn't it.

The present invention was made in view of the above points, and its purpose is to grind a glass plate even when the feed speed of the processing wheel is slowed down at corners where the radius of curvature is extremely small. It is an object of the present invention to provide a plate glass grinding machine using a numerical control system that can prevent excessive cutting of the grinding wheel and facilitate the position adjustment of the processing wheel when the grinding wheel of the processing wheel is worn.

According to the present invention, the object is to provide a plurality of pedestals, a plurality of processing heads disposed corresponding to the pedestals, and a relative positioning of the processing heads with respect to these pedestals in two directions orthogonal to each other. a grinding wheel of the processing head along the periphery of the glass sheet fixed to the pedestal; In a numerically controlled plate glass grinding machine comprising a control means for numerically controlling a linear motion in which The grinding means is supported by the means for causing the grinding so that it can freely turn around the grinding point, and the means for causing the grinding to move freely in parallel to a straight line connecting the grinding point and the center of rotation of the processing wheel of the processing head. The processing head is supported by the processing head 111.
11, and means for individually and independently moving the machining heads in a direction parallel to the straight line, and the control means is arranged to rotate the machining head around a normal line C to the grinding point. This is achieved by means of a grinding machine configured to numerically control the means for swiveling so that the straight line coincides with the straight line.

In FIGS. 1, 2, and 3, this apparatus includes a grinding machine body 1 that moves a processing wheel under numerical control to grind the peripheral edge of a plate glass (ω), and a plate glass that is It consists of a supply device 2 for feeding, and a take-out device 3 for taking out the ground plate glass, each of which is installed on a machine stand 4.

The grinding machine main body 1 shown in this example has a processing head 5 that moves in the X-axis direction, which is the left-right direction when viewed from the front of the device, and a table etc. that moves in the Y-axis direction, which is the front-back direction when viewed from the front of the device. The working wheel 7 is moved along the periphery of the glass sheet 8 while performing the movement and the working wheel 7 is moved around an axis passing through the grinding point of the working wheel 1 and perpendicular to the plane of the glass sheet 8. This machine grinds the periphery of the glass plate 8.

A table 6 installed on the machine stand 4 can move in the Y@ direction, and on the table 6, five pedestals 9 for fixing plate glass 8 for processing are arranged in a - row. These pedestals 9 can fix the glass plate 8 by vacuum suction. For this purpose, the pedestal 9 is connected to a vacuum pump (not shown) via piping and valves. The table 6 has slides 10, 10.10 parallel to each other along the Y-axis direction at both ends thereof, and the slides 10, 10, 10 are connected to the slide rail 11.
, 11.11, the table 6 is supported by the slide rails 11, 11.11.

These slide rails 11, 11.11 are the Y of the machine base 4.
Since the tables 6 are arranged parallel to each other along the axial direction, the tables 6 can move on the machine base 4 in the Y-axis direction.

The servo mechanism for movement in the Y-axis direction is a slide 10°10,
Three sets of feed screw devices 12°12 provided along 10
, 12, a gear box 13.13.13 and a shaft 14 connected to these feed screw devices 12.12.12, and a YJ bite servo motor 16 that drives the shaft 17 via a bell 1-transmission VJ means 15. It consists of The feed screw device @12 consists of a pole screw 17 and a nut 18, and the pole screw 17 is 'j! ! It is fixed to the machine base 4 via 1519, and the nut 18 is fixed to the lower part of the table 6.

The pole screws 17, 17.17 are connected to the gearbox 13.13.13 on the machine base 4, and the gearbox 13
．． 13.13 are connected to each other by a shaft 14. The shirt 1-14 is supported by bearings 20 at several locations on the machine stand 41. The belt transmission means 15 for driving the shaft 14 preferably uses a stepped belt or pulley.

A pedestal 22 is installed above the table 6 via branch pedestals 21 provided at both end sides of the machine pedestal 4.

Two sets of slide rail devices 2 are installed on the front side of this pedestal 22.
3.23 are provided in parallel along the X-axis direction. These slide rail devices 23 and 234 consist of a rail body 24 laid on a pedestal 22 and a plurality of slides 25 that move on this rail body 24.
A linear motion table 26 is fixed to 5. Therefore, linear motion table 2
6 is movable in the X-axis direction by the slide rail device 23.23.

The servo mechanism for the X-axis direction is composed of two sets of slide rail devices I! 23. A feed screw device 27 installed between 23,
The feed screw device 27 usually includes an X-column motor 28 connected to the feed screw device 27 via a belt or the like. Feed screw device 27
consists of a pole screw 29 and a nut 30, the bow screw 29 is fixed to the frame 22 via a bearing 78, and the neck h30 is fixed to the v1 moving base 26.

In FIG. 4, the linear motion table 26 has five grinding heads 31.
are attached so as to be disposed above each pedestal 9 of the table 6, and these grinding heads 31 are connected to a bearing device 32, a processing head 5 suspended from this bearing device 32, and a bearing device 32. It consists of a swing power intake section 33 connected above the device 32. Each grinding head 31 is fixed to the translation table 26 by a bearing device 32.

4 to 6, the processing head 5 includes a spindle motor 34, a cutting direction adjusting slide 42 and a cross slide 43 for adjusting the mounting position of the spindle motor 34 in two orthogonal directions in a horizontal plane. vertical slide 7
A processing wheel 7 is mounted on the shaft of a spindle motor 34. The bearing device 32 consists of a swing @ 36, a plurality of bearings (not shown) that hold the swing shaft 36, and a housing 37 that holds these bearings. There is. The entire machining head 5 is suspended at the lower part of the rotating shaft 36 via a slide device 35, and a bevel gear 1738 is provided at the upper part of the rotating shaft 36 to serve as the rotating power intake part 33. There is. The processing head 5 is rotatable about a pivot shaft 36 of a bearing device 32 as a rotation axis.

In FIGS. 1 and 2, the servo mechanism for the turning movement is
A turning power intake part 33 consisting of a bevel gear 38 installed on the upper part of the turning shaft 36 of the bearing device 32, a line shaft 39 that largely connects the turning power intake part 33 of each grinding head 31, and this lifecycle 1 shaft. 39 and a rotating nervo motor 40 connected to the rotary motor 39. This turning servo motor 4
0 drives the line shaft 39, and further,
Via each pivoting power intake 33, the machining head 5 of each grinding head 31, and thus the machining wheel 7, simultaneously undergo a pivoting movement.

In FIG. 4, the slide adjustment device 3 of each processing head 5
When the center of rotation of the processing wheel 7 is adjusted to match the grinding point A of the processing wheel 1 on the plate glass 8, the processing wheel 7 is moved to the table 6 by numerical control.
According to each movement of the linear motion table 26, a turning movement is performed by numerical control while moving along the periphery of the plate glass 8 fixed to each pedestal 9. Grind it to maintain it.

Next, with reference to FIGS. 4 to 6, a description will be given of the principle and advantages of grinding while the machining wheel 7 performs a numerically controlled turning motion.

The processing wheel 1 is moved along the periphery of the glass sheet 8 so that the milling head 5 passes through the grinding point A of the processing wheel 7 and performs a turning movement around an axis perpendicular to the plane of the glass sheet 8. It is maintained.

At this time, the turning angle of the processing wheel 7 is numerically controlled so that the normal line of the peripheral shape of the glass plate 8 passing through the grinding point Δ matches the straight line connecting the grinding point A and the rotation center 41 of the processing wheel I. . With this arrangement, when the machining wheel 1 becomes worn and its diameter becomes smaller, the installation position of the machining wheel 7 can be adjusted by using the cutting direction adjustment slide 42.
This can be achieved by moving the machining wheel 7 in only one direction so that its grinding point A coincides with the pivot axis 36 of the machining wheel. This has a remarkable effect when a plurality of glass plates 8 are simultaneously ground by a plurality of processing wheels 7, as in the glass plate grinding machine of this specific example. That is,
Since the amount of wear on the machining wheel 1 can be known in advance, by performing a simple operation of moving each cutting direction adjustment slide 42 by the necessary distance, the grinding point of the machining wheel 7 can be adjusted as needed. It becomes easy to reach the turning center 36 of the processing wheel 1. The movement of each cutting direction adjustment slide 42 is preferably as shown in FIG.
It is preferable to control the slider motor 44 by numerically controlling 11 and 9.

Next, go to Fig. 4 and Fig. 6 to control the grinding pressing force I.
A preferred specific example of the a structure will be explained.

In Figures 4 to 6, the same configuration T as in Figures 1 to 3
The I5 element is given the same number.

In these figures, the slide adjustment device 3: consists of a cutting direction adjustment slide 42, a cross slide 43, and a vertical slide 79, and a slide control device 45 to which a spindle motor 34 is attached and a fluid actuator 46. It is arranged on the cutting direction adjustment slide 42. The slide control device 45 is installed so that its moving direction is parallel to the moving direction of the cutting direction adjustment slide 42. Further, the fluid actuator 46 slides the spindle motor 34 and, in turn, the processing wheel 7, in a reciprocating motion along the moving direction of O1lV:=iδ45. , +1111 The pressure surface of the wheel 7 on the glass plate 8 can be changed by x·l. Preferably, a ball slide bearing is used for the sliding control device 45, which moves with a slight operating force η of the fluid actuator 46. Further, it is preferable that θfJ or an air cylinder be used as the fluid actuator 4G.

Next, a method of controlling the pressing force of the 11-piece actuator 4G will be described. As shown in FIG. The secondary air pressure thus generated is transmitted to the fluid actuator 46, and the pressing force of the fluid actuator 46 is controlled. The 1Pi to sudden converter 47 is a device in which the output air pressure changes in proportion to the input current. On the other hand, the current signal input to the electric-to-rush converter 47 is generated by the electric current converter 48. Further, this current converter 48 is interfaced with an auxiliary function section of a numerical control device 49 that controls the grinding machine main body 1, and receives a plurality of auxiliary function signals from the numerical control I device 49. The input of the stage is adapted to produce a current.

This current converter 48 is usually a variable resistance type or a D
/A conversion method. Furthermore, the air converter 47 may be operated by connecting it to another controller, controller, or operational amplifier instead of interfacing it with the numerical control device 49. Note that although an air cylinder is normally used as the fluid actuator 46, it is also possible to use an electric cylinder on the platform.
The secondary air pressure output by the thrust converter 47 may be connected to a hydraulic converter to convert it into i+l+ pressure which is the same pressure as the secondary air pressure, and this oil pressure may be sent to the fluid actuator 46.

In this way, the signal 3 from the numerical control device 49 causes the
The thrust converter 47 changes the secondary air pressure supplied to the fluid actuator 46 to perform grinding while controlling the pressing force of the processing wheel 7 against the glass plate 8 by Zl. This suppressive force is
Preferably, the processing wheel 1 is strong at the straight portions of the periphery of the temporary glass 8 and weak at the corners.1. II ill is desirable. For corners with an extremely small radius of curvature, the feed speed claw of the wheel 7 relative to the plate glass 8 is normally lowered, and at the same time, the secondary air pressure of the multiplex is lowered. In other words, the grinding load is reduced to a low level in the areas where the processing wheel 7 is likely to cause cutting chips on the glass plate 8.
L/1!1, grinding depth is too uniform. 2 water air l
Change 1, book! , : In one example, the diameter of the fluid actuator is 40M and the ratio is 0.3 to 4i/cri to 1, SK9/ci.

In FIGS. 1 to 3, the supply device 2 has (1 and 6 blocks 1-1 applied to each pedestal 9 of the d-cutting machine body 1:) 0△
50E, each block 50Δ to 50[L] is divided into a carrying device 51 for carrying in root glass 8, and this M person device 5.
The plate carried over the lath 8 has a positioning detector 52 that stops the lath 8 at a position corresponding to each pedestal 9.

Further, the supply device 2 includes a lifting device 53 that lifts and lowers the loading device 51 for each block 50Δ to 50E.

The carrying device 51 includes a roller conveyor 54 that slides the glass plate 8 and a belt conveyor 5 that moves the glass plate 8.
Consists of 5. The roller conveyor 54 includes a frame 56 and roller groups 57 disposed on the frame 56, and the frame 56 is supported by the machine base 4 via bins 58. The roller conveyor 54 is vertically swingable with respect to the pedestal 9 about a shaft 58. In addition, the frame body 56 has [Ma,
A belt conveyor 55 consisting of a stopper 59, a pulley 60, a belt 61, and a drive device 62 is provided. This frame 561 is tilted as shown in FIG. 3 when the carrying device 51 is carrying the plate glass 8, and the roller conveyor 5
The peripheral surface of the plate glass 8 and the belt 61 sliding on the surface of the glass plate 8
Due to the frictional force generated due to the contact between bells 1 to 61,
As the sheet glass 8 moves, the glass plate 8 slides on the roller conveyor 54''.

An elevating device 53 serving as an appropriate first elevating device is disposed below each of the conveying devices 51, and a lifting device 53 is provided as an appropriate first lifting device.
When the support frame 56 of each conveyance device 51 is tilted at an angle of preferably 38° with respect to the horizontal, the support frame 56 is set at a raised position δ,
When the plate glass 8 is transferred from the carry-in device 51 to the pedestal 9, the support frame 56 of each carry-in device 51 is controlled to be in a substantially horizontal lowered position.

In this way, the glass plates 8 that have been cut into the required shape in the pre-processing step of the grinding process are sequentially sent from the receiving conveyor 81 to the carrying-in device 51 of the supply device 2. At this time, the belt conveyor 55 of each block 50A to 50E is operated by each drive device 62, and the belt conveyor 55 of each block 50A to 50E is operated by each drive device 62 to
is transported toward the innermost block 50Δ. next,
When the appropriate positioning detector 52 provided on the frame 56 of the block 50Δ detects the arrival of the plate glass 8 at the block 50A, the belt conveyor 55 of the block 50A is stopped, and the frame 56 is moved to the raised position. Waiting state. Similarly, each plate glass 8t is sequentially carried from block 50B to block 50E and stopped. At this time, the table 6, which has been moved in the Y-axis direction toward the conveyance device 51, is waiting under each conveyance device 51 in order to receive the plate glass 8, and each of the nine conveyance devices 51 at the upper Δ position is , n lowering device 53, and the glass plates 8 are simultaneously placed on one of the pedestals 9 and adsorbed. Next, the table 6 that has received the plate glass 8 is moved toward the grinding machine body 1 for grinding.

The take-out device 3 includes a bell 1 to a conveyor 63 as a moving device for receiving plate glass 8 from each pedestal 9 and moving it in the Y-axis direction, and a device as a second lifting device for lifting and lowering the belt conveyor 63. 1 unloading neck 64, feeding plate glass-J' (11-ra conveyor 65, roller conveyor 6
The vehicle is equipped with a driving vj device 66 for driving the motor.

The belt 67 of the belt conveyor 63 is wound around pulleys 69 and 70 provided on the support frame 68 of the lifting device 64. Driven. The support frame 68 of the elevating device 64 is supported by the Sit! Futo? 2 and 7-'8 is supported by the stand 4, and is swung up and down with respect to the pedestal 9 by a drive device 73 about a shaft 72. []-Ra conveyor 65 includes a frame body 74 and a roller group 75 disposed on this frame body 74, and each 1''-ra is connected via a chain transmission means and driven'! It is driven by A position 6G.

In this way, the table 6 on which the plate glass 8, which has been completely ground by the grinding machine main body 1, is placed is moved in the Y-axis direction toward the take-out device S'73, and is cleared at the delivery position 13 (not shown in FIG. 3). Ru. At this time, the support frame 68 of the lifting device 64 is in a substantially horizontal lowered position. Next, each holder 9 releases the suction of the root glass 8, and at the same time, the support frame 68 of the gastrointestinal tube 64 is raised, and the plate lath 8 is received (J passed) on the belt conveyor 63.

Further, the belt conveyor 63 carrying the plate glass 8 is moved in the Y-axis direction by a driving device 71, and the temporary glass 8 is
When it reaches the take-out position C shown in FIG. 3, the lowering device 6
4 is lowered, and the plate glass 8 is delivered to the roller conveyor 65. Then, the plate conveys the lath 8 by driving the roller conveyor 65 and sends it out to the delivery conveyor 77. On the other hand, the table 6 that has delivered the root glass 8 to the take-out device 3 is immediately turned over and moved toward the supply device 2, and the above-mentioned process is repeated.

According to the plate glass grinding machine using the numerical control method configured as described above, it is possible to easily adjust the position of the processing wheel when the processing wheel is worn out, and the grinding point of the processing wheel can be adjusted to match the rotational conditions of the processing wheel. To avoid defeat, this can be achieved by simply moving the machining wheel in the 7'E direction.

Furthermore, as in the specific example, if you control the grinding pressing force (by setting 1 side), you can grind the glass plate even at corners where the radius of curvature is extremely small. Prevent excessive cutting during machining and do 1!

[Brief explanation of drawings]

Fig. 1 is a front view of the grinding machine, Fig. 2 is a plan view of the grinding machine, Fig. 3 is a side view of the +ill ill in machine, Fig. 1 is a partially enlarged side view of the grinding machine, Fig. 5 Figure 6 is a partially enlarged front view of the grinding machine, Figure 6 is a side view of the ω1 grinding machine, and Figure 7 is an electric/pneumatic circuit diagram of the fluid actuator. DESCRIPTION OF SYMBOLS 1...Grinding machine body, 2...Feeding device, 3...Take-out device 'Fl, 5...Processing head, 7...... Processing wheel 8... Plate glass, 1G... Y-axis servo motor, 28...
...X-axis linear motor, 31...Grinding head, 40...Swivel servo motor, 44...
...Slide 1 novo motor.

Claims (8)

[Claims] (1) A plurality of pedestals, a plurality of processing heads arranged corresponding to the pedestals, and a linear movement of the processing heads relative to these pedestals in two orthogonal directions. and numerically controlling the linear movement performed by the means in order to move a processing wheel of a processing head along the periphery of the glass sheet fixed to the pedestal and to grind the periphery of the glass sheet with the processing wheel. In a numerically controlled plate glass grinding machine comprising a control means, each processing head is rotatable around an axis passing through a grinding point of a processing wheel of the processing head on the plate glass and perpendicular to a surface of the plate glass. is supported by the means for causing the linear motion, and is supported by the means for causing the linear motion to be movable in parallel to a straight line connecting the grinding point and the rotation center of the processing wheel of the processing head. Further, means for rotating the machining head around the axis and means for independently moving the machining head in a direction parallel to the straight line are provided, and the control means The grinding machine is configured to numerically control the turning means so that the normal line to the peripheral edge of the plate glass at the grinding point coincides with the straight line. (2) The grinding machine according to claim 1, wherein each of the moving means includes a motor that automatically moves the processing head. (3) The grinding machine according to claim 1, wherein each of the moving means comprises a manually operable screw. (4) The means for supporting the processing wheel while pressing it in the linear direction against the glass plate is supported by the means for causing the linear movement via the moving means. The grinding machine according to any one of Items 3 to 3. (5) The plate glass supply device is disposed on one side of the pedestal row of the grinding machine, and the supply device is connected to a carry-in device for carrying the plate glass and a position where the plate glass corresponds to the pedestal. a positioning detector for detecting when the conveying device has reached the position; and a first positioning detector for raising and lowering the conveying device so that the plate glass is delivered to the pedestal when the conveying device is lowered.
A grinding machine according to any one of claims 1 to 4, comprising a lifting device. (6) The plate glass take-out device is disposed on the other side of the pedestal row of the grinding machine, and the take-out device includes a moving device that transfers the plate glass received from the pedestal to a carry-out device; Claims 1 to 5 further include a second elevating device for raising and lowering the moving device so as to receive the plate glass from the pedestal when the moving device is raised. grinding machine. (7) The grinding machine according to any one of claims 1 to 6, wherein the number of carrying-in devices is the same as the number of pedestals of the grinding machine. (8) The grinding machine according to any one of claims 1 to 7, wherein the carrying-in device comprises a roller conveyor that slides the glass plate and a belt conveyor that moves the glass plate.