KR20200076590A - Grinding apparatus - Google Patents

Abstract

(Task) Accurately managing the remaining amount of grinding stone.
(Solution means) The grinding means 3 provided in the grinding device 1 is lowered by the grinding feed means 4, the lower surface 340a of the grinding wheel 340 is detected, and the grinding means 3 at this time ) Is measured, and the measurement result is stored in the storage means 80. Similarly, the height position of the grinding means 3 when the lower surface 341a of the base 341 is detected by the detector 5 is measured, and the measurement result is stored in the storage means 80. When both height positions are stored in the storage means 80, their difference is calculated by the residual amount recognition means 81 as the residual amount R of the grinding wheel 340, and the residual amount R of the grinding wheel 340 is calculated. Can be recognized.

Description

Grinding device {GRINDING APPARATUS}

The present invention relates to a grinding device for grinding a workpiece.

The grinding process by the grinding device is performed by making the grinding wheel fixed to the bottom of the base of the grinding wheel provided in the grinding means abut against the upper surface of the workpiece held on the holding surface of the holding means while rotating the grinding wheel. In the grinding process, first, the grinding means is lowered toward the workpiece at a high speed to a height position of the grinding means where the lower surface of the grinding wheel contacts the upper surface of the workpiece, and then, the descending speed of the grinding means is suitable for grinding the workpiece. By changing the speed and grinding the workpiece by lowering the grinding means again, a reduction in processing time is achieved.

In order to perform the above-mentioned grinding processing, it is necessary that the grinding device has previously recognized the height position of the grinding means when the lower surface of the grinding wheel contacts the upper surface of the workpiece. Therefore, before the grinding operation is performed, a setup operation is performed in which the grinding device stores the origin position, which is the height position of the grinding means in contact with the holding surface of the holding means and the lower surface of the grinding wheel, and the origin stored in the grinding device by the setup. The height position of the grinding means raised from the position by the amount of the thickness of the workpiece is recognized as the height position of the grinding means in contact with the lower surface of the grinding wheel and the upper surface of the workpiece. When the grinding wheel is worn out by a certain amount by grinding, the grinding wheel is exchanged, but for the remaining amount of the grinding wheel, grinding is performed from the residual amount of grinding wheel immediately after the exchange measured by Nogis or the like immediately after replacing the grinding wheel. By subtracting the amount of abrasive grind abrasive worn out by processing, the remaining amount of abrasive grindstone was calculated, and the grinding wheel was exchanged when the calculated amount of the current abrasive grindstone was below a predetermined value.

Japanese Patent Application Publication No. 2018-058160 Japanese Patent Application Publication No. 2013-158872

An error may occur between the residual amount of the grinding wheel measured by the operator or the like using an angis etc. immediately after the grinding wheel is replaced, and the actual residual amount of the grinding wheel. Therefore, in order to prevent grinding of the workpiece at the expectation of the grinding wheel, it is necessary to exchange the grinding wheel before the remaining amount of grinding grind is limited by adding the above error, and in fact, it is still grinding below the expectation. Despite the presence of grindstone, the grinding wheel is being replaced. That is, there is a problem that the grinding wheel cannot be used up to the limit where the grinding wheel disappears due to an error factor included in measuring the residual amount of the grinding wheel. The problem to be solved by the present invention is to more accurately manage the remaining amount of grinding wheel.

The present invention relates to a grinding means comprising a holding means for holding a work piece on a holding surface and rotatable, a grinding wheel for grinding a work piece held in the holding means, and a grinding wheel arranged in an annular shape on the base, and a grinding means thereof A grinding device comprising a grinding conveying means for moving the grinding surface in a direction perpendicular to the holding surface, the detector detecting the lower surface of the grinding wheel and the lower surface thereof when the grinding means is lowered by the grinding transport means, and The horizontal movement means for moving the detector and its grinding means in a relatively horizontal direction, the height of the grinding means when the detector detects the lower surface of the grinding wheel, and the lower surface when the detector detects the lower surface of its expectation. It is a grinding device provided with the residual amount recognition means which recognizes the difference in the height of a grinding means as the residual amount of a grinding wheel.

In the present invention, since the difference between the height positions of the grinding means when the expected lower surface and the lower surface of the grinding wheel is detected by the detector is calculated as the remaining amount of the grinding wheel, measurement by Nogis or the like becomes unnecessary, and the grinding wheel You can recognize the exact balance. In addition, it can be confirmed to what extent there is no difference between the actual residual amount of the used grinding wheel and the calculated residual amount of the grinding wheel.

1 is a perspective view showing the entire grinding device.
Fig. 2 is a cross-sectional view showing a grinding device when detecting the lower surface of the grinding wheel, (a) shows the state where the probe is positioned below the grinding wheel, and (b) shows a table of the lower surface of the grinding wheel and the table of the detector. It shows the state which made the contact surface contact.
3 is a cross-sectional view showing a grinding device when detecting the lower surface of the base, (a) shows a state in which the probe is positioned below the base, and (b) contacts the contact surface between the base of the base and the table of the detector. It shows the state to be ordered.
4 is a cross-sectional view comparing the height position of the grinding means when the height position of the lower surface and the base of the grinding wheel is detected, (a) shows the state in which the lower surface of the grinding wheel is detected, and (b) is the expectation The lower surface shows the detected state.
5 is a cross-sectional view showing another example of the detector, (a) shows an example using an AE sensor, and (b) shows an example in which the table is elastically supported upward by a spring.

1 Composition of grinding device

The grinding device 1 shown in FIG. 1 is a grinding device for grinding the workpiece W held by the holding means 20 by the grinding means 3. On the base 10 of the grinding device 1, a holding means 20, a cover 22 surrounding the holding means 20, and a bellows cover 23 connected to the cover 22 are arranged. have. The holding means 20 includes a suction part 200 formed of a porous member and a frame body 201 that supports the suction part 200. The suction means 27 is connected to the lower side of the holding means 20, and the workpiece W placed on the holding surface 200a is lowered by the suction force produced by the suction means 27. From suction. In addition, the holding means 20 is supported by an ordinary casing 24 with a bottom, and is rotatable around the rotation shaft 26 by means of rotating means 25 disposed inside the casing 24. It is done.

On the inner base 100 formed inside the base 10 of the grinding device 1, a horizontal moving means 6 is provided. The horizontal moving means 6 includes a ball screw 60 having a rotation axis 65 in the Y-axis direction, a pair of guide rails 61 arranged parallel to the ball screw 60, and a ball screw 60 Is connected to the motor 62 for rotating the ball screw 40 around the rotation shaft 65, and an internal nut is screwed to the ball screw 60, and the bottom portion is sliding on the guide rail 61 A movable plate 63 in contact is provided. When the motor 62 rotates the ball screw 60 around the rotation shaft 65, the movable plate 63 is guided to the guide rail 61 and moved relatively in the horizontal direction (Y axis direction). As a result, the holding means 20 supported via the casing 24 on the movable plate 63 is configured to reciprocate in the Y-axis direction together with the cover 22. Moreover, when the cover 22 moves in the Y-axis direction, the bellows cover 23 is stretched.

The column 11 is erected on the rear side (+Y direction side) on the base 10 of the grinding device 1, and the grinding means 3 and grinding means 3 are provided on the side of the column 11 on the -Y axis side. ) Is provided with a grinding feed means 4 that moves up and down in the Z-axis direction. The grinding means 3 includes a rotating shaft 30 having an axial center in the Z-axis direction, a housing 31 rotatably supporting the rotating shaft 30, and a motor 32 for rotationally driving the rotating shaft 30, An annular mount 33 connected to the lower end of the rotating shaft 30 and a grinding wheel 34 detachably connected to the lower surface of the mount 33 are provided. The grinding wheel 34 includes a base 341 and a plurality of grinding wheels 340 having a substantially rectangular parallelepiped shape arranged in an annular shape on the lower surface 341a of the base 341. The grinding wheel 340 is formed of, for example, diamond abrasive grains fixed with a resin bond, a metal bond, or the like, and the lower surface 340a serves as a grinding surface for grinding the workpiece W.

The grinding feed means 4 includes a ball screw 40 having a rotation axis 45 in the Z-axis direction, a pair of guide rails 41 arranged parallel to the ball screw 40, and a ball screw 40 The motor 42 is connected to the upper end and rotates the ball screw 40, the inner nut is screwed to the ball screw 40 and the lifting plate 43, the side of which slidingly contacts the guide rail 41, When the motor 42 rotates the ball screw 40, which is connected to the lift plate 43 and holds the grinding means 3, and the motor 42 rotates the ball screw 40, the lift plate 43 is guided by this. It is configured such that it is guided by the rail 41 and moves up and down in the Z-axis direction, and the grinding means 3 held in the holder 44 is ground and conveyed in the Z-axis direction perpendicular to the holding surface 200a.

Above the cover 22, and on the side of the holding means 20, the grinding wheel 340 is brought into contact with the lower surface 340a of the grinding wheel 340 and the lower surface 341a of the base 341, respectively. A detector 5 for detecting the lower surface 341a of the lower surface 340a and the base 341 is disposed, and as the cover 22 is driven and moved by the horizontal moving means 6, The detector 5 and the grinding means 3 move in a relatively horizontal direction (Y axis direction). The detector 5 includes a cylinder 51, a table 50 whose lower portion is accommodated in the cylinder 51 and whose upper portion protrudes upward from the cylinder 51, and a sensor 52 formed inside the cylinder 51. ). The table 50 is disposed on the cover 22 so that it can contact the grinding wheel 340 and the base 341 when the grinding means 3 descends. The sensor 52 shown in FIGS. 2-4 is a transmissive photoelectric sensor, for example, and is provided with the light emitting part 52a and the light receiving part 52b. During the operation of the grinding device 1, light continuously emitted from the light emitting portion 52a goes straight along the detection line 52c and is received by the light receiving portion 52b. The signal transmitting unit 56 is connected to the sensor 52, and the signal transmitting unit 56 detects the blocking of light reception in the light receiving unit 52b. (3) The control means 8 which controls the operation, such as the grinding feed means 4 and the horizontal moving means 6, is notified.

The cylinder 51 of the detector 5 is connected to the air source 55 via a relief valve 53 and a valve 54. The table 50 is elastically supported in the +Z direction by the cylinder 51 to which air produced by the air source 55 is fed and pressurized, and is in the upper limit position in a state in which no pressing force is applied from above. Located in. When the table 50 is pressed from above, the air in the cylinder 51 is pressurized, and when the pressure is equal to or higher than a predetermined pressure, the relief valve 53 is properly opened and supplied from the air source 55 to the inside of the cylinder 51 It is configured such that the air to be exhausted is discharged to a space outside the cylinder 51 (not shown), and the pressure applied to the inside of the cylinder 51 is kept constant.

The elevating plate 43 is provided with a height measuring portion 90 for measuring the height position of the grinding means 3 in the Z-axis direction, and the guide rail 41 is provided with a height measuring portion 90. A scale 91 to be read is provided. When the control means 8 receives the detection signal, the grinding means 3 descending by driving by the grinding feed means 4 stops, and the height measuring section 90 positioned on the scale 91 is stopped. The height position is read as the height position of the grinding means 3. Further, a configuration in which the motor 92 is provided with an encoder 92 and the height position of the grinding means 3 is measured by the output of the encoder 92 may be used.

The control means 8 provided in the grinding device 1 is provided with a storage means 80 and a residual amount recognition means 81. The storage means 80 stores the value of the scale 91 read by the height measuring unit 90. Moreover, the residual amount recognition means 81 calculates the remaining amount of the grinding wheel 341 based on the value stored in the storage means 80.

2 Operation of the grinding device

In the grinding device 1 shown in FIG. 1, the workpiece W is placed on the holding surface 200 of the holding means 20, and the holding surface 200 is sucked by the suction means 27. The workpiece (W) is held in suction. Then, the horizontal moving means 6 moves the holding means 20 in the +Y direction, and the workpiece W is positioned below the grinding means 3.

Next, while the rotating means 25 rotates the holding means 20, the motor 32 rotates the grinding wheel 34, and the grinding conveying means 4 further lowers the grinding means 3 Then, the lower surface 340a of the rotating grinding wheel 340 is brought into contact with the upper surface Wa of the workpiece W, and the upper surface Wa is ground. Then, when the workpiece W is formed to a predetermined thickness, the grinding conveyance means 4 raises the grinding means 3 and ends grinding.

Since the lower surface 340a of the grinding grindstone 340 wears out by such grinding, before the protruding amount (residual amount) of the grinding grindstone 340 from the lower surface 341a of the base 341 becomes too small, It is necessary to replace the grinding wheel 34 with a new one. Therefore, in the grinding device 1, a process of recognizing the remaining amount of the grinding wheel 340 is performed at an appropriate timing. Moreover, such a process is also performed when the grinding wheel 34 is replaced with a new one.

Hereinafter, the operation of the grinding device 1 when recognizing the remaining amount of the grinding wheel 340 by the grinding device 1 having the above configuration will be described.

The ball screw 60 is rotationally driven around the rotation shaft 65 by the driving force of the motor 62 provided in the horizontal moving means 6 shown in FIG. 1, and the movable plate 63 is guided along the guide rail 61. By moving in the Y-axis direction, as shown in Fig. 2(a), the contact surface 50a of the table 50 of the detector 5 formed on the cover 22 is placed on the lower surface 340a of the grinding wheel 340. It is placed in the lower position.

Next, as shown in Fig. 2(b), the grinding means 3 is lowered in the -Z direction by the grinding feed means 4 without rotating the grinding wheel 34, and the lower surface of the grinding wheel 340 340a and the contact surface 50a of the table 50 are brought into contact.

While the lower surface 340a of the grinding wheel 340 and the contact surface 50a of the table 50 are in contact, the grinding wheel 340 is further lowered in the -Z direction by the grinding transfer means 4, By pressing the table 50 downward, the lower surface 340a of the grinding wheel 340 pushes the table 50 down. And, as shown in Fig. 4(a), when the lower surface 50b of the table 50 is pushed down to the position of the detection line 52c, the light emitted from the light emitting portion 52a is blocked by the table 50. As a result, light is not received by the light receiving portion 52b. At the moment when no light is received by the light receiving unit 52b, a detection signal informing that the lower surface 340a of the grinding wheel 340 has been detected is transmitted from the signal transmitting unit 56 of the detector 5 to the control means 8 Is sent to. At this time, the pressure applied to the inside of the cylinder 51 rising by the table 50 being pressed is maintained at a constant pressure by being exhausted by the relief valve 53, and the lower surface 340a of the grinding wheel 340 and The force in the +Z direction applied to the lower surface 341a of the base 341 is kept constant, so that it can be accurately measured.

Moreover, when not measuring, the air in the cylinder 51 is exhausted, the table 50 is lowered to the lowest position, and the upper surface 50a of the table 50 is positioned below the holding surface 200a.

When the control means 8 receives a detection signal indicating that the lower surface 340a of the grinding wheel 340 has been detected, the control means 8 controls the grinding transfer means 4 to control the grinding means 3. Stop the descent. The control means 8 recognizes the value Z1 of the scale 91 read by the height measuring unit 90 at the moment when the descending of the grinding means 3 stops, and stores the value in the storage means 80 Remember.

In this way, the height position of the grinding means 3 when the lower surface 340a of the grinding wheel 340 is detected is measured, the value is stored in the storage means 80, and then the grinding transfer means 4 By this, the grinding means 3 is raised, and the grinding wheel 34 is separated from the table 50. Then, by moving the movable plate 63 in the +Y direction by the movement control in the Y-axis direction by the horizontal moving means 6, as shown in Fig. 3(a), the table 50 is expected 341 It is placed in the lower position.

Thereafter, the grinding wheel 34 is lowered in the -Z direction by the grinding conveyance means 4 without rotating the grinding wheel 34 in the same manner as when detecting the lower surface 340a of the grinding wheel 340 described above. As shown in (b), the lower surface 341a of the base 341 is brought into contact with the contact surface 50a of the table 50. In the state where the lower surface 341a of the base 341 and the contact surface 50a of the table 50 are in contact, the base 341 is further lowered in the -Z direction, and the table 50 is pressed downward to make it stand. The lower surface 341a of 341 pushes down the table 50. Then, as shown in Fig. 4(b), when the lower surface 50b of the table 50 is pushed down to the position of the detection line 52c, the lower surface 340a of the grinding wheel 340 is grounded by the sensor 52. A signal informing that it has been detected is transmitted from the signal transmitter 56 of the detector 5 to the control means 8. When the detection signal is received by the control means 8, the descent of the grinding means 3 is stopped, and the control means 8 is read by the height measuring unit 90 at the moment when the descent of the grinding means 3 is stopped. The value Z2 of the scale 91 is recognized and stored in the storage means 80.

The value Z1 of the height position of the grinding means 3 when the lower surface 340a of the grinding wheel 340 stored in the storage means 80 is detected, and the lower surface 341a of the base 341 are detected The difference in the value Z2 of the height position of the grinding means 3 at the time of being calculated is calculated by the residual amount recognition means 81 and recognized as the residual amount R of the grinding wheel 340 (shown in FIG. 4) do. By displaying the value of the residual amount R on a display (not shown) provided in the grinding device 1, based on the value of the residual amount R, the operator determines whether or not the grinding wheel 34 needs to be replaced. can do. Moreover, when the residual amount R is smaller than a predetermined value, the operator may be informed that the grinding wheel 34 needs to be replaced by, for example, sounding an alarm.

For the detector 5, instead of the sensor 52 which is, for example, the transmission type photoelectric sensor described above, as shown in Fig. 5(a), the contactor 57 is attached to the tip (top) of the table 50. You may use the provided AE sensor. In the detection of the lower surface 340a of the grinding wheel 340 using the AE sensor, the lower surface 340a of the grinding wheel 340 at the moment when the lower surface 340a of the grinding wheel 340 contacts the contactor 57 of the AE sensor ) Is detected. When the AE sensor is used, after the contact 57 of the AE sensor and the lower surface 340a of the grinding wheel 340 contact, the grinding wheel 340 does not need to be lowered by the grinding transfer means 4, and grinding The time taken to recognize the remaining amount of the grindstone 340 can be shortened.

Similarly, as shown in Fig. 5(b), instead of the air source 55, the relief valve 53 and the valve 54 connected to, for example, the cylinder 51, the upper portion for receiving the table 50 is Surrounded by an open bottomed barrel 58 and a bottomed barrel 58, one end is connected to the lower surface 50b of the table 50 and the other end is at the bottom of the inner side of the bottomed cylinder 58. The fixed spring 59 may be provided. By using the spring 59, since the table 50 can be elastically supported upward without arranging a pressure generating mechanism such as an air source 55 on the grinding device 1, the entire grinding device 1 It is possible to reduce the size of and reduce the cost for generating pressure.

Moreover, the sensor 52a shown in FIG. 5(b) may be a proximity sensor that detects the lower surface 50b of the descending table 50.

In addition, as shown in Fig. 5(b), in the case of using the spring 59, the grinding wheel 340 is moved horizontally to a position where the grinding wheel 340 does not come into contact with the table 50 during grinding, so that the probe is used. (5) is formed in a batch. For example, the detector 5 shown in Fig. 1 is placed in the -Y direction to form a batch.

In the above embodiment, although the detector 5 is disposed on the cover 22, the present invention is not limited to this, and the detector 5 is disposed on the movable plate 63 to form a cylinder 51 and a table ( 50) You may make it the structure which protrudes.

In addition, when the height position of the grinding means 3 is measured by the output of the encoder 92 described above, for example, the signal of the height position of the grinding means 3 output from the encoder 92 is stored. When the means 80 receives, the difference in height is calculated in the residual amount recognition means 81 based on it, and recognized as the residual amount of the grinding wheel 340.

In addition, the base 341 shown in FIG. 2-5 may use a base having a portion in which the lower surface 341a is formed in a planar shape as a whole, but the lower surface 341a is formed in a planar form. In this case, the upper surface 50a of the table 50 may be brought into contact with a portion formed even in a plane.

In the so-called setup for setting the origin of the grinding wheel 340 at the time of grinding in the grinding apparatus 1, the grinding wheel 340 is held by the grinding transfer means 4 by lowering the grinding means 3 The height position of the grinding means 3 when it comes into contact with the holding surface 200 of 20 is recognized. Therefore, since the setup diagram and the recognition of the remaining amount of the grinding wheel 340 are performed under the control by the grinding feed means 4, for example, when the grinding wheel 34 is replaced, the setup and grinding wheel 340 are The remaining amount can be recognized as a series of operations.

In addition, in the case of dressing the grinding wheel 340, the grinding transfer means 4 grinds the grinding wheel on the dressing board held in the holding means 20 or a sub table (not shown) by lowering the grinding means 3 by grinding the grinding means 3. The lower surface 340a of 340 is brought into contact. Therefore, the dressing of the grinding wheel 340 and the recognition of the residual amount of the grinding wheel 340 can also be performed as a series of operations.

1: grinding device
10: base
11: Column
100: inner base
20: maintenance means
200: suction part
200a: retaining surface
201: Frame body
22: cover
23: bellows cover
24: casing
25: rotating means
26: rotating shaft
27: suction means
3: Grinding means
30: rotating shaft
31: housing
32: motor
33: mount
34: grinding wheel
340: grinding wheel
340a: bottom surface of grinding wheel
341: expectation
341a: When you expect
4: Grinding conveying means
40: ball screw
41: guide rail
42: motor
43: lift plate
44: holder
45: rotating shaft
5: detector
50: table
50a: contact surface
50b: bottom surface of the table
51: cylinder
52: sensor
52a: Light emitting section
52b: light receiving unit
52c: detection line
53: relief valve
54: valve
55: Air One
56: signal transmitter
6: horizontal moving means
60: ball screw
61: guide rail
62: motor
63: movable plate
65: rotating shaft
8: Control means
80: memory means
81: residual amount recognition means
9: Movement amount measuring means
90: height measuring unit
91: Scale
92: encoder
W: Workpiece
Wa: Top
Z1: Height of the grinding means when the lower surface of the grinding wheel is detected
Z2: Height of the grinding means when the expected lower surface is detected
R: Residual amount of grinding wheel

Claims (1)

Grinding means for holding a workpiece on a holding surface and having a rotatable holding means, a grinding wheel having a grinding wheel for grinding a workpiece held in the holding means, and a grinding wheel arranged in an annular shape on a base, and the grinding means for holding the workpiece Grinding device having a grinding feed means for moving in a direction perpendicular to,
A detector for detecting the lower surface of the grinding wheel and the lower surface of the expected when the grinding means is lowered by the grinding transport means;
Horizontal movement means for moving the detector and the grinding means in a relatively horizontal direction;
A residual amount recognition means for recognizing the difference between the height of the grinding means when the probe detects the lower surface of the grinding wheel and the height of the grinding means when the detector detects the expected lower surface as the remaining amount of the grinding wheel. Equipped grinding device.

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