JPH087613B2 - Numerical control unit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a numerical control device for a machine tool whose operation is controlled by an NC code.

[Conventional technology]

In the numerical controller, controls other than the axis drive are controlled by M / S / T.
The code (auxiliary function) is used. The numerical controller is M
・ When executing the S ・ T code, the M ・ S ・ T code (Fig. 6 (A)) is output to the built-in sequencer or the external control device, and then the M ・ S ・ T valid signal (Fig. B))
Is output. Based on this signal, the built-in sequencer or the external control device operates the external device, and after the operation is completed, inputs the next code execution prohibition signal ((C) in the figure) to the numerical control device. The next code execution prohibition signal is generally M ・ S ・
It is called the T end signal, and is hereinafter referred to as the M / S / T end signal.

When the numerical control device recognizes the M / S / T end signal,
Turn off the M / S / T valid signal. When the M / S / T valid signal is turned off, the built-in sequencer or external control device
-Turn off the S / T end signal. The numerical control device is M
When it is recognized that the S / T end signal is off, the NC code is executed next. By this cycle, controls other than the axis drive unit are performed.

[Problems to be Solved by the Invention]

Machine tool users are trying to reduce machining time by just a few, for example, hundreds of milliseconds. What has been an obstacle to shortening the processing time is the time required for signal transmission between the numerical control device and the built-in sequencer or external control device when executing the M / S / T code. This time is a dead time that has nothing to do with the operation of the machine. The time from turning off the M • S • T valid signal to turning off the M • S • T end signal requires, for example, 100 milliseconds. 10-20 M / S / T codes in one program
Since it is used twice, one to two seconds are spent as the dead time in one program.

An object of the present invention is to provide a numerical controller capable of shortening the dead time of signal transmission when executing the M.S.T code and speeding up the signal transmission.

[Means for solving the problem]

The present invention analyzes an NC code and outputs an M / S / T code, which is an NC code indicating an auxiliary function, and a control signal for axis drive, and an execution / next code output from a controlled device. A numerical control device provided with sequence control means for recognizing a prohibition signal is provided with front code type storage means, immediate execution permission means, and post-off execution permission means. The controlled device refers to a device including an internal sequencer of the numerical control device or an external control device.

[Action]

The analysis / execution means outputs the M / S / T code to the controlled device when the read NC code is the M / S / T code, and when it is a code other than the M / S / T code, Executes processing routines other than M / S / T.

When executing M / S / T code, the previously executed NC
When the code is not the M / S / T code, the previous code type storing means is set, and the immediate execution permitting means determines the set state and immediately permits the execution of the next code.
That is, without waiting for the next code execution prohibition signal to turn off,
Enables output of S / T code.

When the previously executed NC code is the M / S / T code, the previous code type storage means is reset. At this time, the post-off execution permission means waits for the next code execution prohibition signal to turn off, and permits execution of the next code.

When the M / S / T code is continuous, if the next M / S / T code is output while the M / S / T end signal is on, correct signal transmission cannot be performed. Since the next M / S / T code is output after the T end signal is turned off, signal transmission can be performed without error.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is an explanatory diagram of the configuration of this numerical controller. The numerical control device 1 is configured by connecting a display device CRT, a keyboard 4, a storage device 5, an axis control unit 6, an input / output device I / O, and a previous code type storage means 8 to a central processing unit CPU. Storage device 5
Consists of ROM and RAM. The axis control unit 6 outputs a control signal to the servo motor M of the controlled device. The input / output device I / O outputs the M / S / T code and the M / S / T valid signal to the controlled device, and the controlled device outputs the M / S / T code.
-The S / T end signal is input. The previous code type storage means 8 has been described with reference to FIG. 1 and comprises a 1-bit register.

The central processing unit CPU and the storage device 5 constitute the analysis / execution means, sequence control means, immediate execution permission means, and post-off execution permission means of FIG. Specifically, the analysis / execution means reads the program by NC code, checks the program grammar, outputs the M / S / T code, and creates a control signal to be output to the axis control unit 6. The sequence control means recognizes the M / S / T end signal to determine the end of M / S / T, and also determines the end of one block of the program and the execution start of the next block (end determination of the program). ..

FIG. 3 shows the control operation of the central processing unit CPU. The NC code program stored in the storage device 5 is read by the central processing unit CPU (S ₁ ) and the NC code is M ・ S ・ T.
It is determined whether or not it is a code (S ₂ ). The M / S / T code is a code that indicates an auxiliary function in a broad sense. It is an auxiliary function code in a narrow sense that commands ON / OFF, etc. on the controlled device side, a spindle function code that specifies the rotation speed of the spindle, and a tool. It includes the tool specification code to specify, the feed function code to specify the feed rate, and so on. NC codes other than the M / S / T codes refer to the preparation function code and coordinate word function code.

When a code other than M · S · T code before setting the code type storing means 8 (S _9), it executes the processing routine other than the M · S · T is the control content of the code (S ₁₀ ). After this, it does termination judgment of the program (S _8), if you do not want to end to read again (S _1).

As shown by the code C ₄ in FIG. 5 (A), when the code is the M / S / T code, the state of the preceding code type storage means 8 is checked (S ₃ ). When the previous code type storage means 8 is in the set state, the previously executed code is not the M.S.T code. At this time, immediately the M.S.T code and the M.S.T valid signal ( Figure 5 (B)) shows the input / output device I /
And outputs it to the O (S _5). When the previous code type storing means 8 is in the reset state, the previously executed code is the M.S.T code, and at this time, it waits until the M.S.T end signal is turned off (S ₄ ), And then M ・ S ・
Outputs T code and M / S / T valid signal. The controlled device receives the M / S / T valid signal
The S / T code is fetched, the operation of the instruction content is performed, and when the operation is completed, the M / S / T end signal is output (FIG. 5 (C)).

Numerical controller 1 is waiting for M · S · T termination signal (S _6), to reset the previous code type storing means 8 when M · S · T termination signal is input (S _7), and program After deciding whether or not is finished (S ₈ ), if not finished, the next code of the program is read (S ₁ ). If it is finished, the termination process is performed.

Explaining with the program of FIG. 4, the operation of FIG. 5 is performed in the case of the M.S.T code indicated by a, b, and c, and the operation of FIG. Become.

In this way, if the previously executed NC code is not the M / S / T code, the M / S / T code is output immediately and the M / S / T is valid without waiting for the M / S / T end signal to turn off. Since the signal is output, the signal can be transmitted to the controlled device at high speed.

When M / S / T codes are continuous, if the next M / S / T code is executed before the M / S / T end signal turns off, the correct signal transmission cannot be performed, but the previous execution code is
If it is an S / T code, the next M / S / T code is output after waiting for the M / S / T end signal to turn off.
It can be performed without error in signal transmission.

Although the preceding code type storage means is composed of a register in the above embodiment, it may be provided in a part of the storage means 5.

〔The invention's effect〕

The numerical control device of the present invention is provided with the preceding code type storing means, and when executing the M.S.T code, if the previously executed NC code is not the M.S.T code, execute the next code. Since the execution of the next NC code is immediately permitted without waiting for the prohibition signal to be turned off, the speed can be increased by the ON period of the substantially next code execution prohibition signal. If the previously executed NC code is the M / S / T code, it waits until the next code execution prohibition signal turns off to allow the next NC code to be executed. The signal can be transmitted without error. As described above, there is an effect that the dead time can be omitted, the signal transmission can be speeded up, and the signal transmission can be performed correctly.

[Brief description of drawings]

FIG. 1 is an explanatory view of the constitution means of the present invention, FIG. 2 is an explanatory view of the constitution of one embodiment thereof, FIG. 3 is a flow chart of its control operation, FIG. 4 is a list of its simulation programs, and FIG. The figure is the same time chart, and FIG. 6 is the time chart of the conventional example. DESCRIPTION OF SYMBOLS 1 ... Numerical control device, 5 ... Storage means, 6 ... Axis control part, 8 ...
Front code type storage means, M ... Servo motor, CPU ... Central processing unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Nagatoshi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 63-205707 (JP, A) JP 63-273105 (JP, A)

Claims (1)

[Claims] 1. An analysis / execution means for analyzing an NC code and outputting an M / S / T code which is an NC code indicating an auxiliary function and a control signal for axis drive, and a next code output from a controlled device. In a numerical control device having a sequence control means for recognizing an execution prohibition signal, the pre-execution NC code is M.
The previous code type storage means set when the S / T code is not set, and the execution of the analysis / execution means is permitted by turning on the next code execution prohibition signal when the previous code type storage means is in the set state. Immediate execution permitting means for resetting the preceding code type storing means, and execution after turning off the execution of the analyzing / executing means until the next code execution prohibition signal is turned off when the preceding code type storing means is in a reset state. Numerical control device provided with permission means.