JPH03142129A - Work processing device - Google Patents

Abstract

PURPOSE:To raise the processing speed to a great extent while maintaining a certain processing accuracy without causing complication of the whole device by furnishing No.1, No.2 control means which control No.1, No.2 rotating means on the basis of phase difference signals. CONSTITUTION:When the phase difference (f) between a grinder gear 10 and a work gear 12 enlarges, the phase difference voltage emitted from a phase comparator 22 itself becomes greater than before, and the amount corresponding to voltage drop due to a phase difference setting device 28 being set to the neg. potential side will be compensated. Accordingly the phase difference voltage entered in No.1 control means 30 recovers the previous size, and the sum voltage with a constant voltage from a speed setting device 32 of the No.1 control means 30 will again become of the same size as the constant voltage from a speed setting device 36 of No.2 control means. That is, the output voltages of amplifiers 31, 35 become equal, and servo motors 16, 14 rotate the above- mentioned work gear 21 and grinder gear 10 again at the specified constant speed.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention relates to a workpiece processing device, and in particular, a gear-shaped grindstone (grindstone gear) is connected to the south face of a gear (workpiece gear). This invention relates to a pressurizing device for a workpiece, which polishes the south surface of a workpiece gear by meshing and rotating the workpiece gear.

(Prior Art) If the south face of the gear is not finished in accurate shape and dimensions, the operation will be uneven, noise will be generated, and mechanical efficiency will be reduced.

Therefore, it is common practice to apply a polishing finish to important gears to improve gear accuracy, finish the south side neatly, and make the gears uniform and less noisy during operation.

Therefore, the gear that is the work (hereinafter referred to as the work gear).
In order to give a polished finish to the work gear, a gear-shaped grindstone (hereinafter referred to as the grindstone gear) is meshed with the south face of the work gear and rotated to reduce the amount of polishing on the south face of the work gear. Two devices have been developed.

Figure 3 shows an example of the configuration of such a work gear polishing device, which is a type of polishing device in which both the grinding wheel gear and the work gear are turned over to finish the work gear. It is a bag type.

In the polishing finishing apparatus shown in FIG. 3, the grindstone gear 10 and the work gear 12 are rotated by servo motors 14 and 16, respectively, and the rotational positions of the grindstone gear 10 and the work gear 12 are controlled by pulse generators (PG) 18. Detected by .20.

The position information detected by the pulse generators 18 and 20 is read into the CPU (central processing unit) 40, and the
In the PU 40, the mutual positional relationship between the grindstone gear 10 and the work gear 12 is calculated by interpolation. Then, the servo motors 14 and 16 are driven based on this interpolation calculation result, and the amount of polishing of the south surface of the work gear 12 is executed.

At this time, the amount of polishing of the tooth surface is controlled by variably adjusting the positional relationship between the grindstone gear 10 and the work gear 12 in interpolation calculation by the CPU 40.

(Problems to be Solved by the Invention) However, the above-mentioned prior art uses the CPU 40 to control each absolute position of the grindstone gear 10 and work gear 12 each time by interpolation calculation, which is currently cost-effective. The scan time of the CPU 40 corresponding to this is short, about 1 millisecond (msec).

For example, this CPU4 with a scan time of 1ms
The required circumferential precision of the work gear 12 with a diameter of 100 millimeters (mm) is 10 micrometers (μm) using
When performing finishing machining, even if all interpolation calculations are performed in advance, the rotational speed of the grindstone gear 10 and work gear 12, that is, the machining speed, will be approximately 0.2 to 0 per minute according to formula 1.
．． It only makes 4 revolutions (rpm).

That is, 60sec+[((100mmXπ)+(10μm
15~10)l x1msec] -0,2~0゜4
rpm Formula, 1 However, (10 μm 15-10) is the actual control accuracy, which is because in order to achieve the required accuracy of 10 μm, a control accuracy that is normally 5 to 10 times that amount is required.

When controlling the absolute positions of the grinding wheel gear 10 and work gear 12 using the CPU 40 in this way, the work gear 12 can only be polished at a pressurizing speed of about 0.2 to 0.4 rpm in the above example. In a finishing device using a profile polishing method, polishing is normally performed at a processing speed of 11,000 rpm or more. Therefore, a device that finishes the south face of the workpiece gear 12 with the grindstone gear 10 under the control of the CPU 40 has a very large limit in terms of processing speed.

The present invention has been made in order to solve the problems of the prior art described above, and is a finishing device for finishing the south side of a work gear using a grindstone gear, the finishing speed of which is 1100 Orp or higher. aim to provide.

[Configuration of the Invention (Means for Solving the Problems) The present invention for achieving the above rotation includes a first rotating means for rotating the tool once, and a 21st rotating means for rotating the workpiece once. l! a first turning stage; a first pulse generating means for generating a pulse signal for detecting the rotational position of the tool; and a second pulse generating means for generating a pulse signal for detecting the rotational position of the workpiece; the first pulse generating means and the second pulse generating means;
a phase comparison means for inputting each pulse signal generated by the pulse generation means and outputting a phase difference signal proportional to the fN'L phase difference between the respective pulse signals; the first pulse generation means; a phase difference setting means for variably setting the phase difference between each pulse signal generated by the second pulse generation means; and a phase difference setting means for inputting the phase difference signal and setting the eleventh! ! A first control means that controls either one of the first rotation means or the second rotation means, and a second control means that controls the other first rotation means or the second rotation means that is not controlled by the first control means. It is characterized by consisting of.

(Function) By configuring in this way, the first rotation means and the second
The tool and the workpiece are rotated by the rotation means, and in response to the rotation of the tool and the workpiece, the first pulse generation means and the second pulse generation means generate pulse signals for detecting the rotational positions of the tool and the workpiece, respectively. . Each of the pulse signals is input to the phase comparison means, and the phase comparison means outputs a phase difference signal having a magnitude proportional to the +14 difference between the pulse signals to the first control means. Then, the first control means controls either the first rotation means or the second rotation means based on the input phase difference signal. At this time, by varying the magnitude of the phase difference signal outputted from the phase comparison means to the first control means by the phase difference setting means, the valley pulse signals generated by the first pulse generation means and the second pulse generation means are respectively generated. The phase difference between 8 and 8 can be arbitrarily and variably set. Therefore, if the side to be controlled by the second control means is used as a reference, it is possible to rotate the other side by shifting the phase by an arbitrarily set phase difference with respect to the rotation of the reference side. Moreover, since only the one-turn phase difference between the tool and the workpiece is feedback-controlled based on analog calculation, the machining speed can be dramatically increased while maintaining a certain machining accuracy.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic configuration diagram of a work gear finishing device according to an embodiment of the present invention, in which a grindstone gear 10, which is a tool, is rotated by a servo motor 14, which is a first rotor stage. The work gear 12, which is a work, is rotated by a servo motor 16, which is a second rotating means, and the grinding wheel gear 10 and work gear 12 are meshed with each other and rotated, so that a polishing finish is applied to the south surface of the work gear 12. It is something. Note that in this embodiment, the grindstone gear 10
The work gear 12 is made to have the same diameter, and is always rotated at a constant speed with the grindstone gear 10 side as a reference. Furthermore, servo motors 14 and 16 with the same performance are used.

In this second device, pulse generators (PG) 18 and 20, which are first pulse generating means and second pulse generating means, are attached to each rotating shaft of a servo motor 14, 16, respectively. This pulse generator 18, 20 generates the same number of square waves as the number of teeth of the grindstone gear 10 and the workpiece gear 12 during one rotation.

This situation is shown in Figure 2, which shows (a) and (
The phase difference f between the grinding wheel gear 10 and the work gear 12 shown in d), that is, the phase difference f between the square waves generated from the pulse generators 18 and 20 shown in FIGS.
Based on this, the amount of polishing of the work gear 12 is determined.

The pulse signal generated by the pulse generator 18.20 is input to the phase comparator 22, which is a phase comparison means. In this embodiment, the square wave from the pulse generator 18.20 can be input to the phase comparator 22. In order to convert the waveform into a sine wave, low-pass filters 24 and 25 are provided between the pulse generator 18, 20 and the phase comparator 22, respectively, to pass only low frequencies.

The phase comparator 22 outputs a voltage proportional to the (rx phase difference f) of the two input waves, but in order to prevent fluctuations in this output voltage and make it a stable voltage, an integrator 26 is provided, and the phase comparator 22 The output voltage from the integrator 26 is passed through the integrator 26.

The phase difference voltage from the phase comparator 22, which has passed through the integrator 26 and has become a stable voltage, is input to a first control means 30, which will be described later, which relatively changes the phase between the grindstone gear 10 and the work gear 12. Therefore, a phase difference setting device 28 is provided as a phase difference setting means. This phase difference setting device 28 is constituted by a variable resistor, and by changing the resistance value, the integrator 26
The phase difference voltage outputted to the first control means can be changed instantaneously.

The first control means 30 is a speed setting device 32 that supplies a constant voltage.
In this first control means 30, the sum voltage of the inputted phase difference voltage and the constant voltage from the speed setting device 32 is inputted to the amplifier 31, and the amplified voltage of the amplifier 31 is The servo motor 16 is controlled by the output voltage to rotate the work gear 12. Further, the second control means 34 includes a speed setter 36 and an amplifier 35 that supply a constant voltage.
A constant voltage from 6 is amplified as it is through an amplifier 35 and output to the servo motor 14, causing the grindstone gear 10 to always rotate at a constant speed. Note that in this embodiment, the amplifier 31
．． As for No. 35, one with the same amplification factor and the same performance is used.

The work gear processing device configured as described above controls the rotational phase difference f between the grinding wheel gear 10 and the work gear 12 by analog feedback control.
Its specific operation is as follows.

When the grindstone gear 10 and the work gear 12 are rotating at a constant constant speed and with a set phase difference f shown in FIG.
1rij-performance servo motor 14.16 as mentioned above
are used, the magnitudes of the voltages output from the amplifiers 35, 31 to the work gears 14, 16 are equal.

1 In other words, in a steady state where the grindstone gear 10 and the work gear 12 are rotating at a constant constant speed, the phase difference voltage output from the phase comparator 22 through the integrator 26 and the constant voltage output from the speed setter 32 The sum voltage is equal to the constant voltage output from the speed setting device 36.

When changing the phase difference f between the grindstone gear 10 and the work gear 12 in order to adjust the amount of polishing of the work gear 12 in such a steady state, for example, when increasing the phase difference f, a phase difference setting device is used. The phase difference setter 28 is set so that the voltage 28 is on the negative potential side, that is, on the side where the phase difference voltage outputted from the phase comparator 22 through the integrator 26 is lowered.

At this time, since the phase difference voltage input to the first control means 30 becomes smaller, the sum voltage with the constant voltage from the speed setting device 32 also becomes smaller as a result. Therefore, the output voltage from the amplifier 31 is lower than the output voltage from the amplifier 35, and the rotation speed of the servo motor 16 is slower than the rotation speed of the servo motor 14. As a result, the phase difference f between the grindstone gear 10 and the workpiece gear 12 increases.

When the phase difference f between the grinding wheel gear 10 and the work gear 12 increases in this way, the phase difference voltage output from the phase comparator 22 itself becomes larger than before, and the phase difference setting device 28 is set to the negative potential side. The voltage drop caused by the setting will be compensated for. Therefore, the phase difference voltage input to the first control means 30 recovers its previous magnitude, and the sum voltage with the constant voltage from the speed setter 32 is again
It has the same magnitude as the constant voltage from 6. That is, amplifier 3
The output voltage from 1.35 becomes equal and the servo motor 1
At step 6.14, the work gear 12 and the grindstone gear 10 are rotated again at a constant speed. At this time, the phase difference f between the grindstone gear 10 and the work gear 12 is larger than before.

Note that the phase difference f between the grindstone gear 10 and the work gear 12
To make it smaller, conversely, set the phase difference setter 28 to the positive potential side. In this case as well, the same feedback as described above will work and the vehicle will immediately return to a steady state of constant velocity.

3 Using the apparatus according to this embodiment, work gear 12 with a diameter of 100 millimeters (mm) was machined under the same conditions as the stage row, that is, with a required circumferential accuracy of 10 micrometers (μm).
When machining, the required frequency response capability of the phase comparator 22 is approximately 260 to 520 to 1040 kilohertz (260 to 520 to 1040 kHz ( kHz).

That is, [((100mmxπ)+(10μm15~10))
x (10~20%)] X (1000rpm÷60
)-260~520~1040kHz2 formula, 2 Therefore, using the device according to this example, 11000rp
In order to achieve this machining speed, it is sufficient to use a phase comparator 22 with a frequency response capability of approximately 520 kilohertz, but a phase comparator 22 with a frequency response capability of this level can be easily inserted. be.

4 Therefore, according to this embodiment, only the rotational phase difference f between the grinding wheel gear 10 and the workpiece gear 12 is controlled by analog feedback control, so that even though the device is relatively simple, It becomes possible to polish the south surface of the work gear 12 with the grindstone gear 10 at a processing speed of 11,000 rpm.

In this embodiment, as shown in FIG. 2, the number of output pulses from the pulse generator 18.20 per revolution is equal to the number of teeth of the grindstone gear 10 and the workpiece gear 12.
However, the number of output pulses per rotation of the pulse generator 18.20 may be an integral multiple of the number of teeth of each gear 10.12. Similarly, a pulse generator 18.
The number of output pulses for grinding wheel gear 10 may be increased.
In order to increase the adjustment range of the phase difference between the work gear 12 and the work gear 12, it is better to have a smaller number of output pulses.

Therefore, the actual number of output pulses is determined in accordance with the user's request, taking into account the control accuracy of the phase difference between each gear 10, 12 and the adjustment width.

Furthermore, in this embodiment, the square wave output from the pulse generator 18, 20 is converted into a sine wave using the low-pass filters 24, 25, but if the phase comparator 22 allows input of the square wave, In this case, the low-pass filters 24 and 25 can be omitted.

Furthermore, in this embodiment, the rotation on the grindstone gear 10 side is used as a reference, but the invention is not limited to this, and the work gear 12 may be always rotated at a constant speed based on the rotation on the work gear 12 side. good.

Further, in this embodiment, the diameters of the grindstone gear 10 and the work gear 12 are made equal, but the diameter is not limited to this, and the diameter of the grindstone gear 10 or the work gear 12 may be made larger than the diameter of the other. Good too.

Furthermore, although the present invention considers the gear 10.12 as a tool and workpiece as in this embodiment, the gear 10.1
In contrast, the device according to the present invention is capable of controlling the positioning of the workpiece based only on the (6 phase difference) between the tool and the workpiece when the surface shapes of the tool 106 and the workpiece 12 are the same, and This is because they are continuous at equal intervals.

[Effects of the Invention] As is clear from the explanation below, according to the present invention,
It has become possible to dramatically increase machining speed while maintaining a certain level of machining accuracy without increasing costs or complicating the entire device.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a work gear finishing device according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the present invention, and FIG.
The figure is a schematic diagram of a conventional work gear device. 10... Grindstone gear (tool), 12... Work gear (
14.16... Servo motor (first and second rotation means), 18.20... Pulse generator (first and second pulse generation means), 22... Phase comparator (phase comparison means), 26... integrator, 28... phase difference setting device (phase difference setting means), 30... first control means, 34
...Second control means. 7

Claims (1)

[Claims] A first rotation means for rotating a tool, a second rotation means for rotating a workpiece, a first pulse generation means for generating a pulse signal for detecting the rotational position of the tool, and a first pulse generation means for detecting the rotational position of the workpiece. a second pulse generating means for generating a pulse signal for the second pulse generating means, and inputting each pulse signal generated by the first pulse generating means and the second pulse generating means, respectively, and generating a pulse signal proportional to the phase difference between the respective pulse signals. a phase comparison means for outputting a phase difference signal; a phase difference setting means for variably setting a phase difference between each pulse signal generated by the first pulse generation means and the second pulse generation means; and the phase difference signal. a first control means for controlling either the first rotation means or the second rotation means based on the phase difference signal; and the other first rotation means not controlled by the first control means. or a second control means for controlling the second rotation means.