JPS60114424A - Automatic mating device in gear grinding device - Google Patents

Abstract

PURPOSE:To improve efficiency by detecting a pulse of a rotary whetstone and a pulse concerning teeth of a work, and storing the number of the pulses. CONSTITUTION:A pulse generator 42 for generating a pulse in responce to revolutions of a cutting tool is connected to a counter 64 while connected from the counter 64 to a count memory circuit 74. Information of a pulse generated from the pulse generator 42 and that of a pulse detected by rotation of a work 20 are introduced into the count memory circuit 74 via the counter 64 and compared with pulse information already stored. A second rotation driving source is controlled by an output signal of the compared result. In such a way, efficiency and processing accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic meshing device for a gear grinding machine, and more particularly, the present invention relates to an automatic meshing device for a gear grinding machine. The present invention relates to an automatic meshing device that can prevent incorrect loading of different types of workpieces and detect abnormal workpieces.

BACKGROUND OF THE INVENTION A device is used that grinds a large number of teeth of a gear by meshing a grindstone with spiral grooves on the circumferential surface of a workpiece, such as a gear. 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, and the desired gear will not be obtained. Therefore, for the synchronized operation of the grindstone and the gear, the following relationship holds true: rotation speed of the grindstone x number of teeth on the grindstone - rotation speed of the workpiece x number of teeth on the workpiece.

Therefore, in the above-mentioned relationship, in the conventional technology, when a new gear is attached and the machining process is to be carried out, the initial meshing must be done manually with the grindstone and gear stopped. Must be. For this reason, when machining a large number of identical gears, it is necessary to stop the grinding wheel each time. Especially when the grinding wheel rotates at high speed and has a high inertia factor, stopping time is wasted, and automatic There was an inconvenience that continuous operation could not be performed.

Furthermore, when a large number of gears to be machined are placed on standby for the grinding process, different types of gears may be mistakenly mixed together. for example,
This is the case when the number of teeth is different even if the modules are the same. If different types of gears that cannot be identified by sight are subjected to the grinding process, it goes without saying that the grinding will not be done properly.
This can also greatly disrupt the grinding process itself.

The present invention has been made to overcome the various problems described above, and includes a first rotational drive source for rotating a cutting tool, and a predetermined pulse generated in accordance with the rotation of the cutting tool. A pulse generator, a second rotational drive source for rotating a work piece that meshes with the cutting tool, and a detector that generates a predetermined pulse in response to rotation of the work piece,
The pulse generator is connected to a counter and from this counter to a count memory circuit, while the output side of the detector is connected to the counter and to the count memory circuit, respectively, so that a predetermined pulse generator generated by the pulse generator is connected. Pulse information and predetermined pulse information detected by the rotation of the workpiece are stored in the count memory circuit via a counter, and then new pulse information is obtained from the detector by the rotation of the workpiece to be mounted. is introduced into the count memory circuit to compare the stored pulse information with the stored pulse information, and the second rotary drive source is controlled based on the output signal.

Next, preferred embodiments of the apparatus of 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, in which reference numeral 10 indicates a bed, and a cutting table 12 is disposed on the upper surface of this bed 10. be done. The cutting table 12 moves forward and backward in the direction of arrow A under the rotational action of the cutting motor 14. A traverse table 16 is further disposed on the upper surface of the cutting table 12, and this cutting table 16 has a driver smoke 18.
As a result, it moves forward and backward at right angles to the direction of arrow B, that is, in the direction of arrow B. Also, on the traverse table 16,
A gear, that is, a workpiece 20 and a workpiece sensor 21 are disposed close to the workpiece 20 . This work 20
is rotated by a work spindle motor 22. The work sensor 21 optically detects the number of teeth of the motor 22 rotated by the motor 22, and generates a predetermined pulse. On the other hand, in the advancing direction of the cutting table 16 and the bed 1
A column 24 is disposed on the 0, and a rotating table 26 is held on this column 24. The turning table 26 is turned in the direction of arrow C by a motor (not shown) disposed in the column 24, and a shift table 28 is further provided on the turning table 26, and this shift table 28 is used for shifting. The motor 30 moves it in the direction of the arrow. A grindstone spindle unit 32 is attached to the shift table 28 . As shown in FIG. 2, the grindstone spindle unit 32 includes a grindstone rotation drive motor 34,
The motor 34 causes a rotating first gear 36 to mesh with the first gear 36, and a grindstone 38 is attached to one end of the rotating shaft.
It basically consists of a second gear 40 to which a second gear 40 is attached, and a first pulse generator 42 that engages with the other end of the rotating shaft of the second gear 40. The circular grindstone 38 has several grooves carved around its periphery.

On the other hand, on the workpiece side, the workpiece 20 is removably supported on one end of a rotating shaft 44 via a pair of clamp jigs 46, and a clutch is attached to the other end of the rotating shaft 44. A gear 50 having a relatively large diameter is pivotally supported. The gear 5
0 meshes with a gear 52 having a smaller diameter than that. gear 52
is supported by a shaft 56, one end of which is connected to the workpiece motor 22 via a compression ring 58, and the other end is connected to a second pulse generator 60 (
(See Figure 3).

Next, in the gear grinding machine constructed as described above, an electric circuit for operating the automatic meshing device will be explained with reference to FIG. 4.

Regarding the first pulse generator 42 on the grindstone unit 32 side, the output side of the A-phase pulse is branched, and one side is connected to the input side of the index calculator 62, and the other side is connected to the counter 64.
connected to one input side of the 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. The output sides of both AND gates 66 and 68 are connected to an OR gate 70, and the output of the OFF gate 70 is amplified by an amplifier 72 connected thereto and introduced into the work spindle motor 22. Next, the pulse from the zero point of the pulse generator 42 is introduced into the other input side of the counter 64. counter 64
The output side of is connected to a count memory 74. In addition,
The count memory 74 also receives the output of a shaping circuit 76 that shapes the waveforms of the output of the counter 64, the pulse from the branched zero point of the pulse generator 42, and the output of the sensor 21 facing the workpiece 20. In this case, the output of the shaping circuit 76 is also introduced into the counter 64. One output side of the count memory 74 is connected to the input side of a counter 78 , and the output of said counter 78 is introduced into one input side of an AND gate 80 . A cutting command signal for the workpiece 20 is introduced into the other input side of the AND gate 80 . The output signal of the analog cutter 80 is amplified by an amplifier 82 and input to the cutting motor 14. The output of the count memory 74 is branched to an AND gate 66, and the other output of the memory 74 is input to an AND gate 68.
Configure it to go in. In addition, in the figure, reference numeral 84
shows an amplifier that amplifies a signal for automatically engaging the workpiece 20 and the grindstone 38, and the amplified signal is introduced into the electromagnetic clutch 48.

Therefore, the operation of the automatic meshing device for a gear grinding machine configured as described above will be explained next.

First, the initial phase alignment between the grindstone 38 and the workpiece 20 is as follows:
Thereafter, when a large number of identical workpieces are to be ground, information about the workpieces, such as number 1, module, number of teeth, etc., is used to teach the device itself.

Therefore, first, turn off the electromagnetic clutch 48. As a result, the work spindle 44 can be rotated lightly by hand (FIG. 5, step 1). Next, the cutting motor 14 is energized to move the cutting table 12 forward (step 2 in the same example).

At this time, the grindstone spindle motor 34 is not energized, and the grindstone 38 is in a stopped state. Therefore, the grindstone 38 and the workpiece 20 can be brought into mesh with each other, and phase alignment can be easily performed manually.

Next, the grindstone spindle motor 34 is rotated at low speed (step 3). Therefore, the grindstone 38 also rotates slowly, and the work spindle motor 22 is also driven to rotate in synchronization with this. Since the workpiece 20 is meshed with the grindstone 38, its rotation causes it to rotate in the opposite direction.

In this state, the number of A-phase pulses (N) of the pulse generator 42 is counted starting from the zero point of the pulse generator 42 until a pulse is output from the workpiece sensor 21 (step 4 of the same) (step 4). (See Figure 6). That is, the A-phase pulse of the pulse generator 42 is introduced into the counter 64, and a signal starting from the 0 point is also introduced into the counter 64. On the other hand, the waveform signal from the sensor 21 is once shaped into a pulse by the waveform shaping circuit 76 and then introduced into the counter 64, and the A-phase pulses are counted until this signal is introduced. This counted pulse value N is stored in the count memory 74. At the same time, the A-phase pulses of the second pulse generator 60 are counted from the time of the first pulse output obtained from the workpiece sensor 21, and this counting is continued until the next pulse output of the workpiece sensor 21. In this case, the count number is set to M (see FIG. 6).

Therefore, regarding this count number M, the following equation holds true.

Gate = 1 /Z2 X P2 XTI/T2... (
Equation 1) However, near 2...Number of teeth on the workpiece TI...Number of teeth on the gear 50 T2...Number of teeth on the gear 52 P2...Number of A-phase pulses per rotation of the second pulse generator 60 Therefore, the workpiece spindle If the number of teeth 22 of the workpiece 20 to be attached to the workpiece 44 is known in advance, the count number M
is a definite value. For this reason, if the counter 64 is equipped with a digital display function in advance, when a measured value m different from the theoretical value M is displayed on the counter 64, it may be caused by incorrect loading of the workpiece, faulty output of the workpiece sensor, or defective workpiece. (Step 5).

When the theoretical value (M) and the measured value (m>) match, the drive of the grindstone spindle motor 34 is stopped (step 6
), at the same time the work spindle motor 22 also stops its rotation. Then, the cutting motor 14 is energized again to move the cutting table 12 and the initial phase alignment is completed (
Same, step 7>. At this time, as mentioned above, the count value (N)
It should be noted that is retained in the count memory 74 as is. Of course, the theoretical value (M) and the measured value (m
) is different, the workpiece 20 indicates that the workpiece 20 has been erroneously inserted, so it goes without saying that it is necessary to remove the workpiece 20.

1 Next, a process of automatically meshing the grindstone 38 and the workpiece 20 using the value N stored in the count memory 74 during the initial phase matching will be described.

Grinding wheel spindle motor 3 with workpiece 20 attached
4, the work spindle motor 22 electrically connected thereto is also driven, and both enter synchronous operation.

Therefore, if the electromagnetic clutch notch 48 is energized (Fig. 7, Ste. Knob 1), the workpiece 20 will be rotated by the work spindle motor 22 (Fig. 7, Ste. Knob 2).
.

In this state, if the cutting motor 14 is energized, the cutting table 12 will gradually move forward (step 3 in the same table). is de-energized.

This is because when the lid is closed and the workpiece 20 is in a normal state, the workpiece 20 has a phase shift with respect to the grindstone 38, and it is necessary to correct the phase shift.

Therefore, the number of A-phase 2 pulses (No.) is counted by the counter 64 starting from the 0 point of the pulse generator 42 until the output of the workpiece sensor 21 is received, and is led out to the count memory 74. As a result, the count memory 74 compares the already stored value (N) with the current count value N'' (step 4 of the same).
). When (N) and (No) are equal, this indicates that there is no phase shift, and just to be sure, counting N' is continued a predetermined number of times (K times) via the counter 78. Step 6) If both times show equality, the signal is introduced into the AND gate 80 (see FIG. 8). When a cutting command signal is input to the other input terminal of the AND gate 80, the AND gate 80 is opened, and the signal is sufficiently amplified by the amplifier 82 to energize the cutting motor 14 and the cutting table 12.
(Step 7). On the other hand, the signal related to this equality is introduced into the AND gate 66, and since the rotation signal n/α with a normal period from the index calculator 62 is introduced into the AND gate 66, the gate is opened. . 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 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 reaches the amplifier 72 via the OR gate 70 and increases or decreases the number of revolutions of the work motor 220 in accordance with the value (N') (step 5 in the same example). By repeating this, a value N' that is approximately equal to the value N is finally obtained, and the phase shift is eliminated.

That is, the n/α signal from the index calculator 62 and the N#N' signal from the count memory 74 enter the AND gate 66, and the output signal opens the OR gate 70, and the output signal between the grinding wheel 38 and the workpiece 20 is input to the AND gate 66. Synchronous operation is restored to normal.
Thereafter, the workpiece 20 will maintain the same phase with respect to the grindstone 38.

In this case, since the count memory 74 indicates N#N', the signal is introduced into the counter 78, and after the confirmation check, the cutting motor 14 is energized as described above. The same is true.

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

For example, for a workpiece having the number of teeth (Z2), (Z2+
Let us consider the case where a workpiece having the number of teeth of 1) is mistakenly inserted. At that time, the following formula holds true.

In the case of a normal workpiece: N'' -N If the number of teeth is one more than that of a normal workpiece, N'=N -Pi (K -1) ・1/Z2+1...
(Second formula) However, Pl...The number of pulses per rotation of the first pulse generator 42, that is, the difference from the normal workpiece is △=P1.(K-1).1/Z2+1...(Third (Formula) Here, if Pl is set to 500, the number of teeth 22 is set to 50, and the difference in count values △ is set to 10, then from the third equation, = 2.02.In other words, by measuring with the counter 78 three times in a row, N'
This means that it can be confirmed that #N.

According to the present invention, as described above, pulses related to the rotating grindstone and pulses related to the teeth of the workpiece detected by a sensor placed close to the workpiece are detected, and pulses related to the teeth of the workpiece are detected. The number of pulses related to the grinding wheel described above 6 until the rising edge of the grinding wheel is stored, and this is configured so that it can be provided as rotation information of the workpiece to be processed in the next stage. Not only can initial phase alignment for synchronous operation of workpieces be easily achieved, but it has also become extremely easy to confirm the type of workpieces to be continuously machined and to check whether the workpieces themselves are good or bad. Therefore, not only improved machining efficiency but also effects such as being able to obtain a ground workpiece of good quality in a short time were obtained.

[Brief explanation of the drawing]

The figures relate to an automatic meshing device in a gear grinding machine according to the present invention, in which Fig. 1 is a perspective view showing its external configuration, Fig. 2 is an explanatory view showing the relationship between the grindstone and the workpiece, Fig. 3 is an explanatory diagram showing the relationship between the workpiece, the pulse generator, and the workpiece motor that drives them; Fig. 4 is a circuit diagram for initial phase alignment and automatic meshing of the grindstone and the workpiece; and Fig. 5 6 is a flowchart of initial phase matching, FIG. 6 is a time chart of initial phase matching, FIG. 7 is a flow chart of automatic meshing, and FIG. 8 is a time chart for automatic meshing. 10... Bed 12... Cutting table 14... Cutting motor 16... Traverse table 18... Driver smoke 20... Work 21... Work sensor 22... Work spindle motor 24... Column 26... Turning Table 2... Shift table 30... Shift motor 32... Grinding wheel spindle unit 34... Grinding wheel motor 36... First gear 38... Grinding wheel 40... Second gear 42... First pulse generator 44 ... Rotating shaft 46 ... Clamp jig 48 ... Clutch 50.52 ... Gear 5
6.. Axis 58.. Compling 60.. 2nd pulse generator 62.. Index calculator 64.
・Counter 66.68...And gate 70...Or gate 72
... Amplifier 74 ... Count memory 76 ... Shaping circuit 78 ... Counter 80 ... And gate 82.84 ... Amplifier patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] (1) A first rotational drive source for rotating a cutting tool, a pulse generator for generating a predetermined pulse in response to rotation of the cutting tool, and a first rotational drive source for rotating a work piece meshed with the cutting tool. 2 and a detector that generates a predetermined pulse according to the rotation of the workpiece, the pulse generator is connected to a counter, and the counter is connected to a count memory circuit; The output side of the device is connected to the counter and the count memory circuit, respectively, and predetermined pulse information generated by the pulse generator and predetermined pulse information detected by the rotation of the workpiece are sent to the count memory via the counter. Stored in the circuit, and then introducing new pulse information obtained from the detector by rotation of the work to be mounted into the count memory circuit and comparing it with the stored pulse information,
An automatic meshing device for a gear grinding machine, characterized in that the second rotational drive source is controlled by the output signal thereof.