JPS6238090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grinding blade shift control device in a gear grinding machine, and more specifically, in a screw roll type gear grinding machine, by shifting a grindstone having a spiral groove carved therein to shift the grinding blade. The present invention relates to a grinding blade shift control device configured to automatically and smoothly correct a deviation from a workpiece that occurs when an effective portion of the grinding blade is displaced.

BACKGROUND ART A device is used in which a grindstone having spiral grooves on the circumferential surface is meshed with a workpiece, such as a gear, to grind the teeth of the workpiece. In this case, unless synchronized operation is achieved between the grindstone and the gear, the grinding action of the grindstone will not be uniformly applied to each tooth of the gear, making it impossible to obtain the desired gear.

By the way, in conventional screw roll type gear grinding machines, the grinding wheel is generally shifted by an appropriate amount in the direction of its rotation axis at appropriate intervals in order to uniformly utilize all the spiral threads of the grinding wheel. ing. That is, by shifting the grindstone,
The meshing position of the gear to be machined is displaced, thereby preventing specific spiral threads of the grindstone from being worn out. However, when shifting this grinding wheel, an expert manually displaces the grinding wheel and visually confirms whether the new grinding part of the grinding wheel actually corresponds to the gear to be ground. I was gone. For this reason, the work efficiency for the grindstone shift cannot be expected to be even that great, and there are various inconveniences, such as having to keep an experienced person on standby at all times.

Therefore, as a result of intensive research and efforts, the inventors of the present invention separated the workpiece gear from the workpiece motor via a clutch mechanism, and separated the workpiece gear from the workpiece motor through a clutch mechanism. The rotation follows the rotation of the grindstone, and then the grindstone is shifted by an appropriate amount. During this time, the rotation information of the workpiece that deviates according to this shift is stored as synchronized operation information with the new grinding wheel, and when the shift is completed and the clutch is engaged, the workpiece rotates with the transfer deviation resolved using the new rotation information. However, it has been found that the above-mentioned inconveniences can be solved all at once.

Therefore, an object of the present invention is to provide a first rotary drive source for rotating a cutting tool, a pulse generator that generates a pulse train consisting of a 0-point pulse and an A-phase pulse, respectively, in accordance with the rotation of the cutting tool. , a second rotational drive source for rotating the gear to be cut that meshes with the cutting tool; a clutch mechanism for transmitting the rotational force of the second rotational drive source to the gear to be cut; and a clutch mechanism for rotating the gear to be cut; a detector that generates a pulse according to the number of tooth tips passing through the cutting tool; a shift mechanism that displaces the cutting tool in its axial direction; a counter that receives the zero point pulse of the pulse generator and the A-phase pulse train signal; a count memory circuit connected to the counter, the counter starts counting the pulses of the A-phase pulse train based on the pulses of the 0-point pulse train of the pulse generator, and also starts counting the pulses of the A-phase pulse train based on the pulses of the 0-point pulse train of the pulse generator, and The count value is stored in the count memory control, and a gate circuit is opened using the synchronous operation information related to the count value and the A-phase pulse train of the pulse generator, and the second rotation drive is performed under the biasing action of the clutch mechanism. The cutting tool and the gear to be cut are operated in synchronization by rotating the power source, and the clutch mechanism is once deenergized to displace the cutting tool under the biasing action of the shift mechanism, and at this time the 0 is changed. The count value of the A-phase pulse train counter for the point pulse train is updated with the synchronous operation information already stored in the count memory circuit using the signal from the detector, and the second rotational drive is performed based on this new synchronous operation information. An object of the present invention is to provide a grinding blade shift control device in a gear grinding machine, which is configured to energize a power source.

Next, preferred embodiments of the grinding blade shift control device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the external configuration of a gear grinding machine for carrying out the present invention, with reference numeral 10.
indicates a bed, and a cutting table 12 is disposed on the upper surface of this bed 10. Cutting table 12
moves forward and backward in the direction of arrow A under the rotation of the cutting motor 14. A traverse table 16 is further disposed on the upper surface of the cutting table 12,
This table 16 is moved forward and backward by a traverse motor 18 at right angles to the direction of arrow A, that is, in the direction of arrow B. In addition, traverse table 16
A gear, that is, a workpiece 20 and a workpiece sensor 21 close to the workpiece 20 are disposed above. This work 20 is rotated by a work spindle motor 22. The work sensor 21 optically detects the number of teeth rotated by the motor 22, for example, and generates a predetermined pulse. On the other hand, a column 24 is disposed above the bed 10 in the advancing direction of the cutting table 12, and a turning table 26 is held by this column 24. The turning table 26 turns in the direction of arrow C by a motor (not shown) disposed within the column 24. moreover,
On this turning table 26, there is a shift table 2.
8 is provided, and this shift table 28 is moved in the direction of arrow D by a shift motor 30.
That is, as shown in FIG. 2, the rotating shaft of the shift motor 30 is connected to a long ball screw 32, and the ball screw 32 is connected to an internal thread 36 directly connected to the grindstone spindle unit 34. match. The grindstone spindle unit 34 includes a grindstone rotation drive motor 38, a first gear 40 rotated by the motor 38, and a first gear 40 that is screwed together with the first gear 40 and has a grindstone 42 attached to one end of its rotating shaft. It basically consists of a second gear 44 and a pulse generator 46 that engages with the other end of the rotation shaft of the second gear 44. The circular grindstone 40 has several grooves carved on its periphery.

On the other hand, on the work side, the work 20 is
The rotary shaft 48 is removably supported on one end of the rotating shaft 48 via a clamp jig 50, and a gear 54 having a relatively large diameter is supported on the other end of the rotating shaft 48 via a clutch 52. The gear 54 meshes with a gear 56 having a smaller diameter. The gear 56 is journaled on a shaft 58, which is connected to the work spindle motor 22 via a coupling 60.

Next, in the gear grinding machine configured as described above, an electric circuit for operating the grinding blade shift control device will be described with reference to FIG. 4.

Regarding the first pulse generator 46 on the grinding wheel unit 34 side, the output side of the A-phase pulse is branched, and one side is connected to the input side of the index calculation section 62, and the other side is connected to one input side of the counter 64. connected to the side. One output side of the index calculator 62 is connected to an AND gate 66, and the other output side is connected to an AND gate 68. both and gate 6
The output sides of 6 and 68 are connected to the OR gate 70,
The output of the OR gate 70 is amplified by an amplifier 72 connected thereto, and the output is output to the work spindle motor 2.
2 will be introduced. Next, the pulse from the zero point of the pulse generator 46 is introduced into the other input side of the counter 64, while the output side of the counter 64 is connected to a count memory 74. The count memory 74 also receives the output of the counter 64 and the pulse from the pulse generator 46 for clearing from the 0 point. One output side of the count memory 74 is then connected to an input side of a counter 76, and the output of said counter 76 is introduced into one input side of an AND gate 78. Note that a cutting command signal for the workpiece 20 is introduced into the other input side of the AND gate 78. The output signal of AND gate 78 is amplified by amplifier 80 and input to cutting motor 14 . On the other hand, the output of the count memory 74 is branched and introduced into an AND gate 66, and the other output of the memory 74 is configured to enter an AND gate 68.

In the apparatus of the present invention, the output of the waveform shaping circuit 82 that shapes the output of the sensor 21 facing the workpiece 20 is branched and introduced into the counter 64, and the other branch output of the waveform shaping circuit 82 is is introduced into count memory 74. On the other hand, the potential of the shift signal of the grindstone 42 is inverted by the inverter 84 and inputted to one input terminal of the AND gate 86, and a signal related to automatic meshing is introduced to the other input terminal of the AND gate 86. Ru. Here, the output signal of AND gate 86 enters amplifier 88 and is used for automatic closing operation of clutch 52.

The device of the present invention is basically constructed as described above, and its operation will be explained next.

First, the electromagnetic clutch 52 is turned off. As a result, the work spindle 48 can be rotated lightly by hand. Next, the cutting motor 14
is energized to move the cutting table 12 forward. At this time, the grindstone spindle motor 38 is not energized, and the grindstone 42 is in a stopped state. Therefore, the grindstone 42 and the workpiece 20 can be brought into mesh with each other, and phase alignment can be easily performed by hand. Next, the grindstone spindle motor 38 is rotated at a low speed. Therefore, the grindstone 42 also rotates slowly,
Also, in synchronization with this, the work spindle motor 2
2 is also rotated. Since the workpiece 20 meshes with the grindstone 42, its rotation causes it to rotate in the opposite direction.

In this state, the number of A-phase pulses (N) of this pulse generator is counted from the 0 point of the pulse generator 46 as the starting point until a pulse is output from the workpiece sensor 21. That is, the pulse starting from the 0 point of the pulse generator 46 is
Based on this, the A-phase pulses are counted by the counter 64. On the other hand, the signal from the sensor 21 is once waveform-shaped into a pulse shape by the waveform shaping circuit 82, and then
The pulse is introduced into the counter 64, and the number of A-phase pulses is determined based on it. This counted pulse value N is stored in the count memory 74 by the next pulse of the waveform shaping circuit 76.

Next, a process of automatically meshing the grindstone 42 and the workpiece 20 using the value N stored in the count memory 74 during the initial phase matching will be described.

When the grindstone spindle motor 38 is energized with the workpiece 20 attached, the workpiece spindle motor 22 electrically connected thereto is also driven, and both enter synchronous operation. Therefore, the electromagnetic clutch 52
If energized, the workpiece 20 will be rotated by the workpiece spindle motor 22. In this state, if the cutting motor 14 is energized, the cutting table 12 will gradually move forward, but the workpiece 20 and the grinding wheel 4 will move forward.
2, the cutting motor 14 is temporarily deenergized before the two mesh with each other.

Therefore, starting from the 0 point pulse of the pulse generator 42, the number of A-phase pulses (N') is counted by the counter 64 until the output of the workpiece sensor 21 is received, and the number is derived to the count memory 74. Note that at this time, the pulse related to the 0 point clears the already stored A-phase pulse value N. At this time, when (N) and (N') are equal, this indicates that there is no phase shift, and just to be sure, the counting of N' is continued a predetermined number of times (K times) via the counter 76. , the signal is introduced into the AND gate 78. and gate 78
When a cutting command signal is input to the other input terminal of the AND gate 78, the AND gate 78 is opened, and the signal is sufficiently amplified by the amplifier 80 to energize the cutting motor 14 and advance the cutting table 12. Become. on the other hand,
A signal related to this equality is introduced into an AND gate 66, and this AND gate 66 is provided with an indexing calculator 6.
The gate is opened because the normally synchronous rotation signal n/α from 2 is introduced. This signal is introduced into the OR gate 70 and operates the work motor 22 synchronously via the amplifier 72, thereby transitioning to a normal grinding process.

Now, when the new count number N' and the stored value N are not equal, this means that there is a phase shift between the grindstone 38 and the workpiece 20. Therefore, that signal is introduced into one input terminal of the AND gate 68, and the signal n/α' related to the phase shift from the indexing calculator 62 is introduced into the other input terminal. , the gate will be opened. Therefore,
The signal is passed through an OR gate 70 to an amplifier 72.
The rotation speed of the work motor 22 is increased or decreased in accordance with the value (N'). If you repeat this, eventually,
A value N' that is approximately equal to the value N is obtained, and the phase shift is eliminated. That is, when N≈N', the synchronous operation of the grindstone 72 and the workpiece 20 is restored to normal, and from then on, the workpiece 20 maintains the same phase with respect to the grindstone 42. In this case, since N=N' in the count memory 74, the signal is introduced to the counter 76, and after the K confirmation checks, the cutting motor 14 is energized, as described above. The same is true (Step 1 in Figure 5).
(Figure 6 points and points).

On the other hand, when N' has an extremely large difference from the value N, automatic operation is stopped for safety reasons.

In the present invention, at this point, the clutch 52 is
is annihilated (step 2). That is, when the grindstone shift signal rises, the output from the inverter 84 is inverted, the AND gate 86 which had introduced the automatic meshing signal into one input terminal closes its gate, and the amplifier 88 is also deactivated. As a result, the rotational force of the work spindle motor 22 is
The workpiece 20 is no longer transmitted to the grinding wheel 42.
It follows the rotation of .

Next, the grinding wheel 42 is shifted by an appropriate amount (step 3 in the same figure) (see the dot in Figure 6). That is, the shift motor 30 is energized, and accordingly, the ball screw 3
The screw 36 that screws these together in order to rotate them is D.
As a result, the shift table moves and the grindstone 42 is also shifted. On the other hand, since the workpiece 20 is meshed with the grindstone 42 at that time, the workpiece 20 is moved in accordance with the shift amount of the grindstone 42.
The phase of 0 will shift.

Therefore, at this point, the pulse generator 46
The signal related to the 0 point clears the conventional pulse number N in the memory 74, and the counter 64 counts the number of A-phase pulses based on the 0 point. This count is based on the sensor 2 near the workpiece 20.
This continues until an output pulse of 1 is introduced into the counter 64 via the waveform shaping circuit 82. Therefore, a new number of A-phase pulses Ns is obtained (dots and dots in FIG. 6), and this is stored in the count memory 74. That is, since the output side of the waveform shaping circuit 82 is branched and connected to the count memory 74, when the next pulse of the waveform shaping circuit 82 is input, the number Ns of A-phase pulses is stored in the count memory 82. become.

On the other hand, at the time when the signal relating to the number of A-phase pulses Ns is introduced into the count memory 82, the clutch 52 is in a disengaged state as described above. Therefore, when the shift signal reaches the "0" level, this signal is inverted by the inverter 84 and becomes the "1" level and is introduced into one input terminal of the AND gate 86. Since the automatic meshing signal is introduced into the other input terminal of the AND gate 86, the gate 86 is opened, and the signal is amplified by the amplifier 88 to close the clutch 52 (fifth
Figure step 5). Therefore, the rotational force of the workpiece spindle motor 22, which is rotating based on the new synchronization signal, is transmitted to the workpiece 20, and the grindstone 42
A new cutting blade is applied to the workpiece 20 and cutting of the workpiece is started.

According to the present invention, as described above, pulses related to the rotating grindstone and pulse information related to the workpiece detected by a sensor placed close to the workpiece to be machined are stored in advance in the storage device. , While this stored information achieves synchronized operation between the grinding wheel and the workpiece, when the grinding wheel is shifted and a new cutting blade is brought into engagement with the workpiece, the phase shift caused by this is combined with the pulse information related to the grinding wheel. By modifying the stored contents of the pulse information related to the workpiece, the clutch of the workpiece motor is engaged based on the information, so that a new synchronous operation can be achieved. Therefore, it is extremely easy to shift the cutting edge of the grinding wheel relative to the workpiece, which not only improves the efficient use and durability of the grinding wheel, but also eliminates the need for precise measurement of the amount of shift of the grinding wheel. is obtained.

[Brief explanation of the drawing]

The figures relate to a grinding blade shift device in a gear grinding machine according to the present invention, FIG. 1 is a perspective view showing its external configuration, and FIG. 2 is an explanation showing the relationship between the grindstone and the workpiece. Figure 3 is an explanatory diagram showing the relationship between the workpiece and the workpiece spindle motor that rotates it, and Figure 4 is a circuit diagram for initial phase alignment between the grindstone and workpiece and for phase alignment after the grindstone is shifted. , FIG. 5 is a flowchart for phase alignment related to grindstone shift, and FIG. 6 is a time chart for phase alignment related to grindstone shift. 10...bed, 12...cut table, 14
...cutting motor, 16...traverse table,
18... Traverse motor, 20... Work, 2
DESCRIPTION OF SYMBOLS 1... Work sensor, 22... Work spindle motor, 24... Column, 26... Turning table, 28... Shift table, 30... Shift motor, 32... Ball screw, 34... Grindstone spindle unit, 36... Screw, 38... Grinding wheel rotation drive motor, 40... First gear, 42... Grinding wheel, 44... Second gear, 46... Pulse generator,
48...Rotating shaft, 50...Clamp jig, 52...
...Clutch, 54, 56...Gear, 58...Shaft,
60... Coupling, 62... Indexing calculator, 6
4... Counter, 66, 68... And gate,
70...OR gate, 72...amplifier, 74...
Count memory, 76...Counter, 78...And gate, 80...Amplifier, 82...Waveform shaping circuit, 84...Inverter, 86...And gate, 88...Amplifier.

Claims (1)

[Claims] 1. A first rotary drive source for rotating the cutting tool, a pulse generator that generates a pulse train consisting of a 0-point pulse and an A-phase pulse, respectively, in accordance with the rotation of the cutting tool, and a target that meshes with the cutting tool. a second rotational drive source for rotating the cutting gear; a clutch mechanism for transmitting the rotational force of the second rotational drive source to the gear to be cut; and a number of tooth tips passing through as the gear rotates. a shift mechanism that displaces the cutting tool in its axial direction; a counter that receives the 0-point pulse of the pulse generator and the A-phase pulse train signal; and a counter that is connected to the counter. the counter starts counting the pulses of the A-phase pulse train based on the pulses of the 0-point pulse train of the pulse generator, stops the counting in response to the detection pulse of the detector, and stores the pulses in the count memory circuit. The count value is stored, and the gate circuit is opened using the synchronous operation information related to the count value and the A-phase pulse train of the pulse generator, and the second
The rotary drive source is rotated to perform synchronous movement of the cutting tool and the gear to be cut, and the clutch mechanism is once deenergized to displace the cutting tool under the biasing action of the shift mechanism, and at this time, the cutting tool is displaced. The count value of the A-phase pulse train counter for the 0-point pulse train to be updated is updated with the synchronous operation information already stored in the count memory circuit using the signal from the detector, and the second synchronous operation information is updated based on this new synchronous operation information. A grinding blade shift control device for a gear grinding machine, characterized in that it is configured to energize a rotational drive source.