JPS6155702A - Numerical controller - Google Patents

Abstract

PURPOSE:To display an abnormal history at check and maintenance by storing the abnormal history to a storage means. CONSTITUTION:A CPU 3 supervises occurrence of abnormity of a machine tool 2 or a processing operation while a numerical controller 1 is in operation. When the CPU 3 detects the occurrence of abnormity, the content of abnormity and the data of the occurrence of abnormity counted by a timer 5 are stored in an abnormity history RAM 8. Whether or not a maintenance switch 10 is turned on is discriminated afterward, and when it is turned off, the content of abnormity and the date of occurrence of abnormity are stored serially in the RAM 8. When the switch 10 is turned on, the CPU 3 displays all the content of abnormity and date of occurrence of abnormity stored in the RAM 8 on a CRT 12 via a bus 4 and an interface 11. The display continues while the switch 10 is turned on and when the switch 10 is turned off, the state restores to the initial state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a numerical control device having a function of updating an abnormality history when an abnormality occurs in the numerical control device.

[Prior art]

Some conventional numerical control devices include, for example, a CPU (central processing unit) that automatically controls a machine tool according to a pre-stored program so as to match a target value. When an abnormality occurs in the numerical control device or machine tool, or when an abnormality occurs during processing of the workpiece by the machine tool, this is detected by cpσ and the details of the abnormality are displayed on a CRT, etc. each time. etc.

However, as described above, when an abnormality occurs, the content of the abnormality in that section is displayed, so there is a risk that the history of the abnormality may become unclear. Therefore, in order to prevent this, it is necessary to manually record and record the history of abnormalities, which has the disadvantage that it is inconvenient to grasp abnormal trends in the numerical control device.

[Summary of the invention]

The present invention was made with the purpose of improving such drawbacks, and by storing the abnormality history in a storage means, the maintenance
This paper proposes a numerical control device that can display the history of abnormalities during inspections and the like.

[Embodiments of the invention]

FIG. 1 is a schematic diagram showing an embodiment of the present invention. (
1) is a numerical control device, and this numerical control device! (1) automatically controls the machine tool (2). (8) is the CPU in the numerical control device 0 (1), and this cpu (1) performs various calculations and also detects abnormalities in the numerical control device (1) itself or the machine tool (2), etc. do.

(4) is a path, (5) is a timer that counts the date and time, and (6) is a ROM (read-only memory) that stores the operating program for the machine tool (2) inputted by an input device (not shown). , (γ) is a RAM (readable and writable memo! (9) is an interface that conveys maintenance switch ON/OFF information to the CPU (8), αη
is a display device, for example, an interface for transmitting signals between a CRT (to) and a CPU (8), and 03) is a CPU
, (8) and the machine tool (2), and these timers (5), ROM (
6), RAM (7), abnormality history RAM <8), interface (9), (b), and α information exchange signals with the CPU (8) via path (4).

Next, the operation of the above embodiment will be explained with reference to FIG. FIG. 2 is an explanatory diagram of the operation of FIG. 1.

First, when the start switch (not shown) of the numerical control device (1) is turned on, the numerical control device (1) starts operating (step 100), and the operation program stored in the ROM (6) is sequentially executed by cpσ (8). The CPσ(
A work command is given from 8) to the machine tool (2) via the interface αB), and the machine tool (2) operates according to the operation program (step 101). CPU
(8) is the numerical control device (1) itself or this numerical control device! (
1) Occurrence of an abnormality in a machine tool (2) that is controlled by
Or monitor the occurrence of abnormality in machining operation (step 10)
2).

When an abnormality occurs, the CPU (8) detects this and stores the details of the abnormality and the date and time of the abnormality counted by the timer (6) in the abnormality history RAM (8), and then releases the maintenance switch. It is determined whether or not the sound is on (step 104). Note that if no abnormality occurs in step 102 and the operation is normal, the abnormality history storage operation is not performed and the process proceeds to step 104. In step 104, if the maintenance switch α@ is in the OFF state, the process returns to step 101. If an abnormality has occurred, the details and date and time of the abnormality are recorded in the abnormality history RAM (8
) are stored in sequence. On the other hand, in step 104, the maintenance switch (to) is set for maintenance 2 inspection.
When turned on, cpU (a) gives a display command to cn (121) via bus (4) and interface (b) k, and stores it in the abnormality history RAM (8) by the CRT (to). The contents of all the abnormalities and the date and time of abnormality occurrence are displayed, and the maintenance switch is maintained in the on-state display operation (step 106).

When the display is no longer necessary and the maintenance switch is turned off, steps 106 to 101
returns to the initial state.

In this embodiment, the abnormality history contents are automatically stored by the abnormality history R input M (8), and the stored contents can be displayed as appropriate by turning on the maintenance switch αQ. Therefore, the status of the abnormality history can be easily checked, and thereby the characteristics of the numerical control device (1) and operational and maintenance problems can be accurately known.

In the above embodiment, the abnormality return history is displayed on the CRT (b), but a printer may be provided in place of the CRT (2) or in addition to the CR'r (2) to display the abnormality history. It is also possible to print the contents. In addition, a clearing switch is connected to the bus (4) via an interface, and this clearing switch allows RAM (8
) It is also possible to configure the system to delete the abnormality history contents stored in the system. Furthermore, when the maintenance switch (to) is turned on, it is also possible to display the abnormality history on the CRT (2) while sequentially advancing the control program for the machine tool (2).

〔Effect of the invention〕

As described above, according to the present invention, the storage means automatically stores the time of occurrence of the abnormality and the contents of the abnormality, and the stored contents are displayed on the display means using a switch. The content of the abnormality history can be displayed as appropriate during the process, and this allows you to accurately understand the characteristics of the numerical control device and problems in operation and maintenance.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram showing an embodiment of a numerical control device according to the present invention, and Fig. 2 is a flowchart showing the operation of Fig. 1.0 (1) Numerical control device (2) Machine tool (a)・
・c p ry (5)・-Timer (6)--
ROM (8)” @ RAMα@...Maintenance switch (to) #-CRT

Claims (1)

[Claims] In a numerical control device that controls the operation of a machine tool according to a pre-stored program, a detection means for detecting the occurrence of an abnormality in the numerical control device, and a time of occurrence of the abnormality and the contents of the abnormality are stored based on a detection signal of the detection means. memory means to
A numerical control device comprising: a display means for displaying the contents stored in the memory means; and a switch for operating the display means.