JPS62278609A - Numerical controller - Google Patents

Abstract

PURPOSE:To clearly display various speed changes without using an oscilloscope and also to facilitate the setting of a proper motor time constant as well as the check of the abnormality of a servo system, by displaying graphically the command speed signal, the feedback speed signal and the error signal. CONSTITUTION:The command speed signal 4 of each axis (motor) is obtained through an arithmetic processing part 1 and undergoes the acceleration/ deceleration processing. The speed differences between the signal 4 undergone the acceleration/deceleration processing and the feedback speed signal detected by a detector 6 are accumulated to obtain the error signal 8. At the time of graphic display, those signals 4, 7 and 8 are stored in each memory and the address of each memory is replaced. Then the signal 8 is sent to a motor 5 after D/A conversion. These said actions are repeated in the sampling cycles and the magnification, reduction and clipping are given to the signals 4-8 based on the data stored in each memory. Then these signal are displayed on a CRT 2.

Description

[Detailed Description of the Invention] 6. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a numerical control device that completely controls machine tools and the like.

[Conventional technology]

FIG. 5 is a block diagram showing the configuration of a conventional numerical control device. In the figure, (1) is the arithmetic processing unit that creates everything such as the command speed of the machine (motor) (for example, the movement t of the sampling period), and (2) is the cathode ray tube (hereinafter referred to as 1cRT) that displays input data, machining status, etc. 5) (Keyboard for inputting data such as the 31D Canadian program and processing conditions,
(4) is the next command speed signal created by the calculation processing unit (1), (
5) is a motor controlled by a numerical controller; (6)
is a detector that measures the speed of the motor (the movement of the machine), (7) is the feedback speed signal detected by this detector (6), and (8) is the command speed signal (4) and the feedback Velocity signal (accumulates the difference with force and is a ratio error signal.

Figure 6 is an explanatory diagram showing all the changes in the command speed signal (4) before and after the acceleration/deceleration processing performed in step 13 (first-order delay in the figure). The vertical axis shows speed and the horizontal axis shows time. In this figure, the broken line represents the command speed Gi before acceleration/deceleration processing, and the solid line represents the command speed signal after acceleration/deceleration processing.

Next, its operation will be explained. First, the arithmetic processing unit tx
Command each axis (each motor) with t! If (for example, movement fi of the sampling period) signal (4) is requested, acceleration/deceleration processing (-second delay, second delay, etc.) is performed.

Here, the command speed signal (4) after acceleration/deceleration processing and the detector (
6) An error signal (8) can be obtained by multiplying the speed signal fed back (sword speed difference t''J!).This error signal (8) is sent to a digital A/-7fog (D/A) converter. ;9), it is converted into an analog signal and sent to the motor (5).When detecting a change in the error signal (8), the change in the voltage supplied to the motor (5) is detected using an oscilloscope. My friend who is measuring. Similarly, when detecting all changes in feedback velocity signal (force), the change in signal voltage fed back from detection 0 (6) with an oscilloscope was measured. Problems] Conventional numerical control devices are configured as described above, so when detecting speed changes in the servo system, minute changes in acceleration and deceleration are unclear even when using an oscilloscope with a set of memory. In addition, there were other problems such as the inconvenience of carrying the oscilloscope.

This invention was made to solve all of the above-mentioned problems, and is a numerical control system that can detect changes in the command speed signal, feedback speed signal, and error signal more clearly in detail than the conventional oscilloscope 7. Equipment (for all purposes).

[Means to solve all problems]

The numerical control system fIL according to the present invention is useful because it allows command speed signals, feedback speed signals, and error signals to be graphically displayed on a CRT.

[For production]

By graphically displaying changes in various speeds, the numerical control device according to the present invention can obtain clearer images than conventional oscilloscopes, and can also be enlarged and a! Small display is also easy.

[One Example of the Invention] An example of the invention will be described below with reference to the drawings. 1st
In the figure, parts that are the same as those in the conventional device shown in FIG.

In the arithmetic processing unit (1), αl is an error signal memory that stores the data of the error signal (8) within an arbitrary time, and αυ is the command M degree signal (4) within an arbitrary time.
), a command speed signal memory (I'J
is a feedback velocity signal memory that stores feedback velocity signal (force data) within an arbitrary time.

Fig. 2 is an explanatory diagram showing a display example of 7Jll deceleration (here - next delay), and Fig. 6 is an explanatory diagram showing a complete display example when the motor (5) decelerates and stops when DO deceleration with a second delay is performed. 4 shows an enlarged view of the area within the broken line in FIG. 3 for the following explanation.

First, the arithmetic processing unit (1) obtains command speed signals for each axis (motor) and performs acceleration/deceleration processing. Then, the speed difference between the command speed signal (4) after acceleration/deceleration processing and the feedback speed signal (force) detected by the detector (6) is accumulated to produce an error signal +81 tl.
-Seek. When graphic display is performed, the command speed signal (4), feedback speed signal (7), and error signal (8) are stored in respective memories, and the addresses of each memory are updated. Next is the error signal! 81 to digital-analog (D
/A) Convert and send to motor (5).

The above operation sound sampling period is repeated. Then, based on the data stored in each memory, enlargement, reduction, and clipping are performed and displayed on CR, T +2).

For example, after displaying a second-order delay deceleration stop as shown in Figure 6,
By enlarging and inspecting the waveform within the broken line as shown in FIG. 4, an appropriate time constant can be set. In addition, the command speed signal (4) and feedback speed signal (7) are displayed simultaneously,
This makes it possible to check for abnormalities in the amplifier, motor, etc.

〔Effect of the invention〕

As described above, according to the present invention, since the command speed signal, feedback speed signal, and error signal can be displayed graphically, it is possible to clearly display the M degree change of each string without using an oscilloscope. It becomes easier to set the time constant and check for abnormalities in the servo system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a numerical control device according to an embodiment of the present invention, FIGS. 2 to 4 are explanatory diagrams showing graphic displays, FIG. 5 is a block diagram showing a conventional numerical control device, and FIG. The figure is a characteristic diagram showing speed changes before and after acceleration/deceleration processing. In the figure, +1) HA performance W processing jilIffi, +21HCR
T, t31ij Keyboard, (,1) command speed signal, (5) motor, (6) detector, (7) feedback speed signal, (8) error signal, (9) VA converter ,
(10) is a memory for error signals, (2) is a memory for command speed signals, and til) is a memory for feedback speed signals. Note that the symbol @ in the middle of each figure indicates the same as -M, and fc indicates the corresponding portion t.

Claims (1)

[Claims] A numerical control device that has the function of graphically displaying changes in the command speed signal output to the motor and changes in the speed signal fed back from a detector connected to the motor.