JPS5866117A - Numerical controlling device - Google Patents

Abstract

PURPOSE:To offer a numerical controlling device provided with an abnormality detecting device which detects the abnormality of the numerical controlling device and machine tools which are controlled by this device, by monitoring the cycle time of the working operation. CONSTITUTION:A CPU 1 reads a one-cycle time signal 510 of the normal operation from a timer circuit 51 of an abnormality detecting device 5 and displays it on a set display part 2. When the value is normal, it is set to a set value storage circuit 52 by the set display part 2. When a set value 520 is set and the operation is started, the timer circuit 51 is reset initially and is counted up continuously. The count-up value is compared with the set value in a comparator 53; and when the set value is smaller than the count-up value, a cycle time over signal 530 is outputted to an interruption generating circuit 54, and the circuit 54 generates an interrupt signal 540 to the CPU 1. The CPU 1 outputs an operation interrupting command to a controlling part 4 to stop the operation of a machine tool 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerical control device including a numerical control device and an abnormality detection device 1 for detecting an abnormality occurring in a machine tool controlled by the numerical control device.

As an abnormality detection device for conventional numerical control equipment.

A general method is to add an abnormality detection circuit that can detect an abnormality in a particular circuit or control section from among the several circuits and control sections that make up the numerical value side@device.

Such a method has the disadvantage that only abnormalities in a limited circuit or control section can be detected. Additionally, if an abnormality detection circuit is added to each circuit and control unit that constitutes a numerical control device, the hardware will become extremely complex and expensive, which is impractical, and even with this, errors may occur between each circuit and each control unit. This is the abnormality 1
It was difficult to detect.

This invention was made in view of the above-mentioned drawbacks of the conventional technology, and it is possible to detect abnormalities in a numerical control device and a machine tool controlled by the numerical control device by monitoring the cycle time of ZJO machining operation. The overall purpose is to provide a numerical control device t equipped with an abnormality detection device capable of detecting abnormalities.

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

In the figure, (11 is an electronic computer, and (2) is a setting display section, which is comprised of a setting section that commands setting values and the like to the computer 111, and a display section that displays operating conditions and the like.

(31 is a machine tool, (41d is a control unit that controls the entire machine, (4) is an abnormality detection device that detects abnormality in cycle time, and a timer circuit 6υ.

It is equipped with a set value storage circuit, a comparator, and an interrupt generation circuit.

Next, the operation of this device will be explained.

First, the child calculation Isoyama is the one cycle time signal 510 of the normal machining operation. The timer circuit 6 of the abnormality detection device (5)
1) and display it on the setting display section (2). Here, the operator selects the 1 displayed on the setting display section (2).
Read the cycle time, and if the value is normal, the setting display section (2) will indicate the cycle time to the abnormality detection device (
51 set value storage circuit @. At this time, the value does not have to be the same as the value set for the cycle time, and may be any value.

When the cycle time set value 520 is set in the set value storage circuit (to) and the machining operation is started.

The timer circuit 151) is automatically initialized and continuously counts up during machining operation. Also,
This timer circuit 1511 is automatically initialized when the machining operation is completed, and counts up from the initial state each time the same machining operation is repeated. Furthermore, the count-up value of the timer circuit +5υ and the set value of the set value storage circuit 6 are input to the ratio et#, +531 and compared in magnitude, and when the count-up value is larger than the set value, the above comparison is made. Cycle time over No. 48 5jO is output from the interrupt generator 1531 to the interrupt generation circuit IH) 41. The interrupt generating circuit (to) which received this cycle time over signal 530 immediately generates an interrupt signal 540 for all the above-mentioned electronic computers (11'). A command signal to interrupt the machining operation is output to the control unit (4), and the operation of the machine tool f31 is corrected.This prevents secondary accidents.

As described above, the present invention provides a machine tool equipped with an abnormality detection device for monitoring the cycle time of machining operation and controlled by this numerical control device.
l; i electronic computer; (2) is a setting display section;

(31 is the machine tool, (4) is the control unit, 15+#i abnormality detection device.

(511 is a timer circuit, 1531 is a set value storage circuit,
1541 is a comparator, and 1541 is an interrupt generation circuit.

Agent Nobu Kuzuno - [

Claims (1)

[Scope of Claim] A numerical control device that has a fully built-in electronic computer and controls a machine tool, including one set value memory circuit that stores cycle time set values for normal machining operation. A timer circuit that counts up the cycle time of machining operation, a comparator that compares the set value and the count-up value and outputs a cycle time over signal when the count-up value is larger than the set value, and A numerically controlled glSIi device comprising an abnormality detection device comprising an interrupt generation circuit that receives a signal and generates an interrupt signal to the computer.