JPS62245404A - Numerical control system - Google Patents

Abstract

PURPOSE:To smoothly perform the restart-up of a machine tool, by connecting an automatic shut-down device to the numerical controller of the machine tool, and always stopping automatically the machine tool at a secured position against the change of environment in the neighborhood of the machine tool, such as abnormal temperature rise, humidity rise, or vibration, etc. CONSTITUTION:Abnormality for the temperature rise is detected by a temperature detection circuit 63, and for the humidity rise, by a humidity detection circuit 64, and for the vibration, by a vibration detection circuit 65, respectively. At the detecting time of those abnormality, a signal corresponding to respective abnormal state is transmitted to a numerical control part 2 by a command from a CPU61 through an interface 66, and a cable 7, and the signal is transmitted to a motion control unit 25 by the command from a CPU21. A driving part 4 stops a machine tool at the secured position based on the signal from the motion control unit 25. The secured position in this case, is decided by the CPU61 according to data stored in a storage device 62.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control system that automatically stops a machine tool at a safe position when an abnormality occurs.

[Conventional technology]

FIG. 3 is a block connection diagram showing a conventional numerical control system (hereinafter abbreviated as NC). In the figure, 1 is a data input/output section, 2 is a cable 3 connected to this data input/output section
It is a numerical control device connected via. Here, the numerical control device 2 includes a central processing unit (hereinafter abbreviated as CPU) 21, which is a microprocessor, and a storage device 22, which includes a read-only memory and a random access memory.
, an operation board 23 , an input/output device 24 that inputs and outputs data to and from external equipment such as the operation board 23 , a motion control unit 25 that controls drive motors for machine tools, etc. An interface 26 is provided.

FIG. 4 is a block connection diagram showing the entire numerical control system to which the machine tool 5 is connected. The machine tool 5 is connected to the numerical control device 2 via the drive section 4. As shown in FIG.

Next, one operation will be explained. First, when performing numerical control machining, the operator must
, input processing information such as the Canadian program. As a result, the processing information is stored in the storage device 22 of the numerical control device 2.
will be written to. Next, the operator inputs a machining command from the operation board 23. Then, in response to a command from the CPU 21, the motion control unit 25
The motor is driven while controlling the number of rotations, rotational phase, etc. of the drive motor to be controlled. That is, when a command for the above-mentioned control from the numerical control device 2 is input to the drive section 4, the drive section 4 performs processing control, positioning control, etc. of the machine tool 5 in accordance with the above-mentioned command.

[Problem that the invention seeks to solve]

Since the conventional numerical control system is configured as described above, it has a configuration and a system that can stop the machine tool 5 at a safe position when the machine tool 5 is subjected to abnormal temperature rise or vibration due to fire, earthquake, etc. Therefore, when the machine tool 5 is restarted after the above-mentioned abnormality has been recovered, there is a problem that the numerical control operation of the machine tool 5 becomes erroneous.

This invention was made to solve the above-mentioned problems, such as abnormal temperature rises in machine tools.

The purpose of the present invention is to provide a numerical control system that can safely stop a machine tool at a position even if humidity increases or vibrations occur, and can restart the machine tool smoothly.

[Means for solving problems]

The numerical control system according to the present invention connects an automatic stop control device to the numerical control device, and when an external abnormality occurs to the machine tool, the automatic stop control device moves the machine tool to a safe position. The structure is such that it is stopped at .

[For production]

The automatic stop control device in this invention detects abnormalities such as temperature, humidity, vibration, etc. around the machine tool, and supplies signal data to the numerical control device to stop the machine tool at the safest position according to the detection results. act.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 6 is an automatic stop control device connected to the numerical control device 2 via a cable 7. As shown in FIG. 2, this automatic stop control device 6 includes an interface 66 for inputting and outputting data to and from the numerical control device 2;
A CPU 61 that processes various data, a storage device 62 composed of read-only memory, random access memory, etc., and a temperature detection circuit 63 that detects abnormal temperature, humidity, and vibration, which are external abnormalities to the machine tool.
．． It has a humidity detection circuit 64 and a vibration detection circuit 65. 27 is an interface within the numerical control device 2 connected to the interface 66 of the automatic stop control device 6. Note that other blocks that are the same as those shown in FIGS. 3 and 4 are given the same reference numerals, and redundant explanation thereof will be omitted.

Next, the operation will be described in detail. The operation of the numerical control device 2 is the same as that described for the conventional example, so the automatic stop control of the machine tool 5 will be mainly described here. That is, the temperature detection circuit 63 detects the temperature rise, the humidity detection circuit 64 detects the humidity, and the vibration detection circuit 65 detects the vibration. When these abnormalities are detected, signals corresponding to each abnormal state are transmitted to the numerical control section 2 via the interface 66 and cable 7 according to commands from the CPU 5, and furthermore, according to commands from the CPU 21, the signals is transmitted to the motion control unit 25. In the drive unit 4, the signal from this motion control unit 25 is also used.
Stop the machine tool 5 at a safe position. Note that the safe position in this case is determined by the CPU 131 according to the data stored in the storage device 62.

〔Effect of the invention〕

As described above, according to the present invention, an automatic stop control device is connected to a numerical control device of a machine tool, so that the machine tool can always be safely protected against environmental changes such as abnormal temperature rises, humidity rises, or vibrations. Since the machine tool is configured to automatically stop at a certain position, the machine tool can be restarted smoothly, and the machine tool can be operated and managed smoothly and with high precision. .

[Brief explanation of drawings]

FIG. 1 is a block connection diagram of a numerical control system according to an embodiment of the present invention, FIG. 2 is a more detailed block connection diagram of FIG. 1, and FIG. 3 is a detailed block connection diagram of a conventional numerical control system. FIG. 4 is also a schematic block connection diagram. 1 is a data input/output unit, 2 is a numerical controller, 4 is a drive unit,
5 is a machine tool, 6 is an automatic stop control device, 21 is a central processing unit (CPU), 22 is a storage device, 25 is a motion control unit, 26° 27 is an interface, 61 is a CPU, 62 is a storage device, 63 is a temperature Detection circuit 64 is a humidity detection circuit, 65 is a vibration detection circuit, and 66 is an interface. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. 3rd w 4151

Claims (2)

[Claims] (1) In a numerical control system in which the central processing unit of the numerical control device calculates machining information according to a certain program and controls the operation of the machine tool according to the calculation results,
A numerical control system characterized in that an automatic stop control device is connected to the numerical control device, which controls the machine tool to stop at a safe position when an external abnormality to the machine tool is detected. (2) The numerical control system according to claim 1, wherein the target of abnormality detection is temperature, humidity, or vibration around a machine tool.