JP6490893B2 - Spindle rotation control device for processing machine - Google Patents

Description

  The present invention can easily adjust the rotational speed of the spindle in a general-purpose processing machine such as a general-purpose lathe, a general-purpose drilling machine, a general-purpose milling machine, or a general-purpose grinding machine that adjusts the rotational speed of the main spindle with an analog volume, and The present invention relates to a spindle rotation control device that can display accurately.

In processing machines such as general-purpose lathes, general-purpose drilling machines, general-purpose milling machines, general-purpose grinding machines, etc., centering on manual processing, the rotational speed of the spindle is controlled using a rotational speed control device as shown in FIG. (For example, refer to Patent Documents 1 and 2).
That is, a variable resistance type volume 12 and an amplifier 13 are arranged between the power source 11 and the motor M that rotates the spindle, and the voltage of the power source 11 is changed by rotating the dial type volume 12 to change the resistance value. The output voltage value is made variable, and this output voltage is input to the amplifier 13 to obtain a drive voltage for driving the motor M and apply it to the motor M. In addition, the drive voltage output from the amplifier 13 is displayed on the display unit 16 so that the approximate spindle rotation speed is indicated. Also known is a processing machine that reads the rotational speed of the spindle with a sensor and displays it on the display unit 16.

Japanese Patent Laid-Open No. 6-143091 (see, for example, the description of FIG. 4 and paragraph 0017) JP-A-6-126517 (see, for example, the description of FIG. 2 and paragraph 0011)

  However, the above-described conventional processing machine has a problem that the rotational speed of the spindle is not displayed unless the switch of the motor M is turned on to rotate the spindle. This is the same in both the display unit 16 for displaying the driving voltage and the display unit 16 for reading and displaying the rotation of the main shaft with a sensor. Therefore, there has been a problem that it is not possible to know what rotation speed is set before the main shaft is rotated. In this type of processing machine, the spindle speed is generally set by a combination of switching between high and low speed two-stage gears and the setting of the volume 12, but if the spindle does not rotate, the speed is set. Is not detected, there is a possibility that the main shaft may be rotated while the high speed setting is maintained. Therefore, when the switch of the motor M was turned on, there was a problem that the spindle suddenly started rotating at high speed.

  An object of the present invention is to solve the above-described problem, and it is possible to accurately display the set rotation speed of the main spindle on the display unit without rotating the main spindle, and to set the target rotation speed in advance. An object of the present invention is to provide a spindle rotation control device for a processing machine that can start rotation of a spindle in a set state.

To achieve the above object, the spindle rotation control device of the present invention is a spindle rotation control of a machining machine that controls and displays the rotation speed of a spindle of a general-purpose processing machine including a general-purpose lathe, a general-purpose drilling machine, a general-purpose milling machine, and a general-purpose grinding machine. In the apparatus, the volume by which the output voltage can be adjusted, the constant voltage power source that applies a reference voltage that is always a constant voltage to the volume by turning on the power source of the processing machine, and the power source to the motor that rotates the spindle is turned on. A driving power source for driving a motor, an A / D converter that digitally converts the output voltage output in accordance with the adjustment of the volume with reference to the reference voltage, and outputs it as a control value, and the control value is input And a controller that outputs a drive command to rotate the motor at the number of rotations assigned to the control value, and the drive by turning on the power to the motor. It is constituted to have a driving unit for rotating the motor at a rotational speed based on a command, and a display unit for displaying the rotational speed of the main shaft corresponding to the drive command.
According to this configuration, the output voltage from the volume that outputs the voltage as an analog value is input to the A / D converter, and a digital control value corresponding to the output voltage value from the volume is controlled by this A / D converter. Is input to the department. In the control unit, a drive command signal for rotating the main shaft at a rotation speed corresponding to the control value is output to the drive unit for rotating the motor. At this time, if the power source for rotating the motor is ON, the motor is rotated at a set number of rotations. Further, the number of rotations of the main shaft corresponding to the drive signal is displayed on the display unit. When the value of the output voltage from the volume fluctuates, the average value of the drive command may be output from the control unit for a certain time or a certain number of outputs. The driving unit may have an inverter function. The volume, the constant voltage power source, the A / D converter and the display unit, and the control unit and the drive unit may be selectively provided in one unit. Further, in the case where the processing machine includes a spindle rotation speed adjustment unit that adjusts the rotation speed of the spindle, the control unit receives information on the spindle rotation speed and the control value input from the spindle rotation speed adjustment unit. The drive command may be generated and output from

Since the present invention is configured as described above, the rotation speed of the spindle can be displayed on the display means without driving the motor, and the rotation speed of the spindle can be confirmed and set even when the spindle is stopped. It can be carried out. Further, the rotation of the main shaft can be started at the main shaft rotation speed displayed on the display unit.
Furthermore, flickering may occur in the display of the rotational speed depending on the position of the volume, but if the average value of the driving command is output from the control unit for a certain time or a certain number of times of output, the rotational speed of the spindle Variations and flickering of the rotation speed displayed on the display unit can be suppressed.
The spindle rotation control device according to the present invention has a simple configuration and combines the volume, the constant voltage power supply, the A / D converter and the display unit, and optionally the drive unit and the control unit into one unit. Can be easily retrofitted to existing processing machines.
Moreover, even if the motor provided in the processing machine is a general-purpose motor, by controlling the drive of the motor so as to rotate the spindle at the number of rotations according to the drive signal by providing an inverter function in the drive unit Is possible.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration of a spindle rotation control device according to an embodiment of the present invention.

  As shown in FIG. 1, the spindle rotation control device has a dial-shaped volume 2 for adjusting the rotation speed of a spindle (not shown), and a constant voltage (reference voltage) with respect to the volume 2 by turning on the power of the processing machine. ), A / D converter 3 for A / D converting the voltage value output from volume 2 into a digital control value, and output from this A / D converter The control value thus input is input via the I / O interface 4, and a control unit 5 that generates and outputs a drive signal according to the control value, and the rotation speed according to the drive signal from the control unit 5 The driving unit 7 drives a motor (not shown) for rotating the main shaft, and the display unit 6 displays the number of rotations of the main shaft according to the driving signal.

  Furthermore, the processing machine of this embodiment is provided with a multi-stage pulley type or multi-stage gear type transmission (not shown) that can change the rotational speed of the main shaft in stages by changing belts and chains. Yes. The belt and chain can be switched by operating the speed switching lever 9. By switching the position of the speed switching lever 9, for example, the rotation of the spindle between “high speed mode” and “low speed mode”. You can switch the number. The transmission and the speed switching lever 9 constitute a spindle speed adjusting means for adjusting the spindle speed. The position of the speed switching lever 9 can be detected by detecting means such as a limit switch, and the position information of the speed switching lever 9 detected by the detecting means (that is, information on the rotational speed of the main spindle by the main spindle speed adjusting means). Is input to the control unit 5 via the I / O interface 4. The control unit 5 adds a coefficient based on the position information (for example, the coefficient is set to “3” when the rotation speed of the “high speed mode” is 3 times based on the “low speed mode”) to the control value. To generate a drive signal.

In this embodiment, the volume 2 is a variable resistance type, and outputs a voltage value corresponding to the variable resistance value with reference to the voltage of the constant voltage power supply 1. The control unit 5 outputs a drive command for rotating the motor at the number of rotations assigned to the control value. The drive unit 7 of this embodiment has an inverter function. The rotational speed of the three-phase induction motor provided in the processing machine can be freely adjusted by changing the frequency, and the motor is rotated at the rotational speed corresponding to the drive signal of the drive unit 7. Power for rotating the motor is supplied from a driving power supply 8.
FIG. 2 is a diagram illustrating an example of the spindle rotation control device S configured as described above.
On the surface of the case Sa, a volume 2 for setting the rotational speed of the main shaft and a display unit 6 for digitally displaying the rotational speed of the main shaft are provided. The switch below the volume 2 is a motor / brake ON / OFF switch.

Inside the case Sa, a battery as the constant voltage power supply 1, an A / D converter 3, and an I / O interface 4 are accommodated. The drive unit 7 and the control unit 5 having an inverter function may be provided inside the case Sa or may be provided outside the case Sa.
Thus, since the main part of the spindle rotation control device S of the present invention can be configured as a single unit, it can be easily retrofitted to existing processing machines.

When the power of the processing machine is turned on in the spindle rotation control device having the above configuration, a voltage value corresponding to the variable resistance value of the volume 2 is output from the volume 2 with the voltage of the constant voltage power supply 1 as a reference. Then, the control value digitally converted from the A / D converter 3 is output to the control unit 5 via the I / O interface 4.
From the control unit 5, a drive signal generated based on the control value or a drive signal generated by adding position information of the speed switching lever 9 to the control value is output to the display unit 6 and the drive unit 7. . As a result, the motor is driven to rotate the main shaft at a predetermined rotation number, and the display unit 6 displays the rotation number of the main shaft.

In the variable resistance type volume 2, the value of the output voltage may slightly vary depending on the set position. Then, this fluctuation causes the control value to fluctuate to change the rotation speed of the main spindle or flicker the value of the main spindle rotation speed displayed on the display unit 6.
Therefore, in the spindle rotation control device of this embodiment, as shown in FIG. 3, the control unit 5 generates a drive signal based on the average value of the output voltage value from the volume 2 every certain time or fluctuates, This drive signal is output to the display unit 6 and the drive unit 7. By doing in this way, the dispersion | variation in the rotation speed of a main axis | shaft and the flicker of the rotation speed displayed on the display part 6 can be suppressed.

As mentioned above, although embodiment of this invention has been described, this invention is not limited to said description.
For example, the volume 2 has been described as a dial type that changes the resistance value by rotating, but may be a slide type that changes the resistance value by moving a knob in a linear direction.
In the above description, the drive unit 7 is provided with an inverter function. However, when the motor provided in the processing machine is a servo motor or the like, the inverter function may not be provided.

  The present invention can be suitably applied to general-purpose machine tools such as general-purpose lathes, general-purpose drilling machines, general-purpose milling machines, and general-purpose grinding machines. However, any machine that rotates the spindle by adjusting the volume can be used as a machine tool. The present invention is not limited to the inspection apparatus (which is included in the category of “processing machine” in this specification) and other processing machines.

It is a block diagram concerning one Embodiment of the main-axis | shaft rotation control apparatus of this invention, and explaining the structure. It is a figure explaining the whole spindle rotation control device composition of the present invention. It is a graph explaining the state which produces | generates a drive signal based on the value of the output voltage from a volume based on the average value for every fixed time. It is a block diagram of conventional spindle rotation.

S Spindle rotation control device Sa Case M Motor 1 Constant voltage power supply 2 Volume 3 A / D converter 4 I / O interface 5 Control unit 6 Display unit 7 Drive unit 8 Drive power supply 9 Speed switching lever

Claims (5)

In the spindle rotation control device of a processing machine that controls and displays the rotation speed of a spindle of a general-purpose processing machine including a general-purpose lathe, a general-purpose drilling machine, a general-purpose milling machine, and a general-purpose grinding machine.
A volume with adjustable output voltage,
A constant voltage power source that applies a reference voltage, which is always a constant voltage, to the volume by turning on the power of the processing machine;
A driving power source for driving the motor by turning on the power to the motor for rotating the spindle ;
An A / D converter that digitally converts the output voltage output in accordance with the adjustment of the volume with reference to the reference voltage, and outputs it as a control value;
A control unit that receives the control value and outputs a drive command to rotate the motor at the number of rotations assigned to the control value;
A drive unit that rotates the motor at a rotational speed based on the drive command by turning on the power to the motor;
A display for displaying the number of rotations of the spindle corresponding to the drive command;
A spindle rotation control device comprising: 2. The spindle rotation of a processing machine according to claim 1, wherein when the value of the output voltage from the volume fluctuates, an average value of the drive command for a fixed time or a fixed number of outputs is output from the control unit. Control device. The spindle rotation control device for a processing machine according to claim 1, wherein the drive unit has an inverter function. The spindle rotation control device for a processing machine according to claim 1, wherein at least the volume, the constant voltage power source, the A / D converter, and the display unit are provided in one unit. In a case where the processing machine includes a spindle rotation speed adjusting unit that adjusts the rotation speed of the spindle, the control unit uses the information related to the spindle rotation speed input from the spindle rotation speed adjustment unit and the control value. The spindle rotation control device for a processing machine according to any one of claims 1 to 4, wherein the drive command is generated and output.

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