JPS62111304A - Control device for rotational frequency of main spindle - Google Patents

Abstract

PURPOSE:To improve reliability by arranging a changing means for changing an output of a numerical controller based on an external command signal applied from an external device in the numerical controller. CONSTITUTION:The numerical controller 10 is provided with a working program, 11, a processing switching circuit 12, a D/A converter 13, and an amplifier 14, etc., and the external device 17 is connected to an input circuit 18 in the control device 10. In this case, a changing means for changing an output of the control device 10 into a signal corresponding to external command signals Sb, Sc supplied from the external device 17 is formed by the input circuit 18 and a processing switching circuit 12 in the control device 10. When the switching command signal Sc is inputted, the circuit 12 switches an operation mode from the working program 11 side to the input circuit 18 side to process the external main spindle rotational frequency command signal Sb. Consequently, the rotational frequency of the main spindle of a working machine or the like can be controlled by the external command signal Sb.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a spindle rotation speed control device that uses a numerical control device as a main control device to control the rotation speed of a spindle of a machine tool or the like.

[Conventional technology]

FIG. 3 is a block diagram showing the configuration of a conventional example.

In the figure, numeral 30 denotes a numerical control device, in which an internal spindle rotational speed command signal SA given from a machining program 31 is processed by a processing circuit 32 consisting of a microcomputer, etc. The voltage is converted into a proportional analog voltage, amplified by an amplifier 34, and output. The output signal SA' from the numerical control wJ device 30 is supplied to the spindle motor amplifier 36 via a switching circuit 35 installed outside the numerical control til+ device 30. Thus, the spindle motor amplifier 36
The spindle motor is driven and controlled at a predetermined rotation speed by electrical energy supplied from the spindle, thereby controlling the rotation speed of the spindle of a machine tool or the like.

On the other hand, 37 is an external device that supplies an external spindle rotation speed command signal SB and a switching command signal SC to the switching circuit 35. When the switching command signal SC is applied to the switching circuit 35, the switching circuit 35 switches from the numerical control device side to the external equipment side. Therefore, instead of the output SA' of the numerical control device 30, the output SB of the external device 37 is supplied to the spindle motor amplifier 36. Thus, as in the case described above, the spindle motor is driven by the electrical energy supplied from the spindle motor amplifier 36, and the rotational speed of the spindle of the machine tool or the like is controlled.

[Problem that the invention seeks to solve]

In this way, in the conventional spindle rotation speed control device, in order to control the spindle rotation speed by an external command from the external device 37, the switching circuit 3 is installed separately from the numerical control device 30.
5 is set. Therefore, the number of components increases, and it is necessary to connect this switching circuit between the amplifier 34 of the numerical control device 30 and the spindle motor amplifier 36.
The circuit configuration is 711, which has the drawback of lowering reliability of operation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a spindle rotation speed control device that has a small number of parts, a simple circuit configuration, and can be expected to operate with high reliability.

[Means for solving problems]

In order to solve the above problems and achieve the objects, the present invention is characterized by taking the following measures.

(1) A numerical control device capable of sending out a numerical control device based on an internal spindle rotation speed command signal given from a machining program is provided.

(2) A means is provided to supply the required electrical energy to the main shaft motor in accordance with the output of the numerical control device.

(3) An external device is provided to output an external command signal consisting of a switching command signal and an external spindle rotation speed command signal.

(4) A changing means is provided for changing the output of the numerical control device to one corresponding to the external command based on an external command signal given from the external device.

This changing means includes an input circuit that introduces an external command signal given from the external device into the numerical system t[I device, and a switching command signal in the external command signal introduced by this input circuit to control switching and processing the processing. a switching circuit that switches an internal spindle rotation speed command signal from the program to an external spindle rotation speed command signal from the external device;
It is assumed that it is provided within the numerical control unit 15A.

[Effect]

An input circuit that introduces an external command signal from an external device into the numerical control device, and a switching circuit that switches between an internal spindle rotation speed command signal generated within the numerical control device and an external spindle rotation speed command signal from the external device. is provided within the numerical control device, so external spindle rotation speed control is possible without separately providing a conventional switching circuit outside the numerical control device. Moreover, since the high filtering ability inherent in the numerical control device can be effectively utilized, efficient and highly reliable operation can be performed.

〔Example〕

1 and 2 are diagrams showing an embodiment of the present invention. FIG. 1 is a block diagram showing the overall configuration, and FIG. 2 is a block diagram showing the configuration of the processing/switching circuit shown in FIG. 1. be.

In FIG. 1, 1o is a numerical control device. A machining program 11 in this numerical control device 10 is a program for numerical control, and an internal spindle rotation speed command signal Sa is commanded within this program. The internal spindle rotation speed command signal 3a given from the machining program 11 is supplied to a processing/switching circuit 12. The processing/switching circuit 12 is composed of a microcomputer, and reads the internal spindle speed by processing the internal spindle rotation speed command signal Sa, and reads the external spindle speed by processing the external spindle rotation speed command signal sb, which will be described later. Take the lead. The output of this processing/switching circuit 12 is D/
The signal is supplied to the A conversion circuit 13. The D/A conversion circuit 13 is
It converts the spindle rotation speed, which is the output of the processing/switching circuit 12, expressed as a digital value, into an analog voltage directly proportional to the spindle rotation speed.The amplifier 14 amplifies the analog voltage and outputs it to the outside.

The numerical control device output from the numerical control device 10 is as follows:
It is supplied to the spindle motor amplifier 16. The main shaft motor amplifier 16 is for rotating the main shaft motor. The rotational speed of the spindle motor is determined by the analog voltage output from this amplifier 16. Thus, the spindle motor amplifier 3
The main shaft motor is driven to rotate at a predetermined rotational speed by the electrical energy supplied from 6, and the rotational speed of the main shaft of a machine tool or the like is controlled.

On the other hand, 17 is an external device. This external device 17 is composed of a control device such as a sequence controller or equipment such as a switch mechanism, and is configured to receive an external spindle rotation speed command signal s.
b and outputs an external command signal consisting of a switching command signal SC.

By the way, in the numerical control device 10, the external device 1 is
A changing means is provided for changing the output of the numerical control device 10 based on an external command signal given from 7 to one corresponding to the external command.

This changing means includes the input circuit 18 and the processing/switching circuit 1.
It consists of two switching parts. The input circuit 18 receives an external command signal sb output from the external device 17,
This is a circuit for introducing SC into the numerical control device 10, and each of the above-mentioned signals Sb, introduced by this input circuit 18,
Sc is supplied to the processing/switching circuit 12. The processing/switching circuit 12 receives a switching command signal S
When C is input, the operation mode is switched from the machining program 11 side to the input circuit 18 side. Therefore, instead of the internal spindle rotation speed command signal Sa, the external spindle rotation speed command signal sb
will be processed and output.

FIG. 2 is a diagram showing the configuration of the main parts of the processing/switching circuit 12. The processing/switching circuit 12 is constituted by a general microcomputer, and is also used as a control circuit for the entire numerical control device. FIG. 2 is a diagram showing only the parts directly involved in processing and switching the spindle speed. In the figure, 21 is a CPU (central processing unit), and 22 is a ROM (
read-only memory). This ROM 22 contains a program for processing and switching the spindle speed and a numerical control device [
A program for controlling the entire 10 is stored. 23 is a RAM (memory for constant speed calls), and the above R
This is a memory that temporarily stores data necessary for executing the OM22 program. 24 and 25 are interfaces for the CPU to recognize input/output signals. 2
6 is a data bus, which is a transmission path for address and control signals.

Next, the operation of the apparatus configured as described above will be explained. The CPLJ 21 in the processing/switching circuit reads the internal spindle rotation speed command signal 3a from the machining program 11.

Similarly, the CPIJ 21 reads an external spindle rotation speed command signal sb and a switching command signal SC from the external device 17 via the input circuit 18 and the interface 24. Also CP
U21 determines which of the internal spindle rotation speed command signal @Sa and the external spindle rotation speed command signal SI) is to be selected depending on the state of the switching command signal SC. When the internal or external spindle rotation speed command signal Sa or sb is selected according to the determination result, the selected signal is output to the D/A conversion circuit 13 via the data bus 26 and the interface 25.

The series of operations described above are executed by the CPU 21 according to a processing program stored in the ROM 22.

The RAM 23 is used as a temporary data storage area when performing these processes.

The spindle rotation speed command signal input to the D/A conversion circuit 13 is converted here to an analog voltage proportional to the input value (digital value), and is installed outside the numerical control device 10 through an amplifier 14. It is supplied to the spindle motor amplifier 16. Thus, the output of the amplifier 16 drives the main shaft motor at a predetermined rotational speed.

As described above, according to this device, by introducing the external spindle rotation speed command signal @Sb from the external device 17 and the switching command (No. 3 Sc) into the numerical control device 10 and processing the signals,
The rotation speed can be controlled based on an external spindle rotation speed command signal without providing an auxiliary circuit for switching.

〔Effect of the invention〕

According to the present invention, a changing means for changing the output of the numerical control device to one corresponding to the external command based on an external command signal given from an external device, that is, an input circuit for introducing the external command signal; A changing means is provided in the numerical control device 11, which comprises a switching circuit that is switched and controlled by a switching command signal from the machining program and switches an internal spindle rotation speed command signal from an external device to an external spindle rotation speed command signal. , the spindle rotation speed can be controlled externally without installing an auxiliary circuit for switching outside the numerical control I device, and the spindle has a small number of parts, a simple circuit configuration, and can be expected to operate with high reliability. A rotation speed control device can be provided.

[Brief explanation of drawings]

1 and 2 are diagrams showing an embodiment of the present invention. FIG. 1 is a block diagram showing the overall configuration, and FIG. 2 is a block diagram showing the configuration of the processing/switching circuit shown in FIG. 1. be. Third
The figure is a block diagram showing the configuration of a conventional example. 10... Numerical control device, 11... Machining program,
12... Processing/switching circuit, 13... D/A conversion circuit, 14... Amplifier, 16... Spindle motor amplifier,
17... External device, 18... Input circuit, 30...
Numerical control device, 35... switching circuit. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] a numerical control device capable of sending out a numerical control output based on an internal spindle rotation speed command signal given from a machining program; a means for supplying required electrical energy to the spindle motor in accordance with the output of the numerical control device; An external device that outputs an external command signal consisting of a switching command signal and an external spindle rotation speed command signal, and an output of the numerical control device based on the external command signal given from this external device to be changed in accordance with the external command. The changing means includes an input circuit for introducing an external command signal given from the external device into the numerical control device, and a switching means for switching according to the switching command signal in the external command signal introduced by the input circuit. A switching circuit for switching an internal spindle rotation speed command signal from the machining program to an external spindle rotation speed command signal from the external device is provided in the numerical control device. Number control device.