JPS5951004B2 - Check system in the control system of numerical control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a control system for a numerical control device that is commanded by a tape to which a predetermined operation sequence is applied, and includes a tape reader, a computer with calculation and storage functions, and a pulse distribution circuit. It is related to the Nikku system.

To machine the pin portion of the crankshaft, the rotation of the crankshaft and the feed of the tool are synchronously controlled to perform the desired machining.

For example, a tape reader that reads the operating sequence from a tape. - A computer that has calculation and storage functions and calculates and stores them based on commands (input sequences). - Distributes pulses to the drive circuit based on the computer's output. A numerical control device (hereinafter referred to as an NC device) with a built-in pulse distribution circuit controls the operation of the crankshaft rotation drive body and the tool feed drive body, and synchronously controls the rotation of the crankshaft and the feed of the tool. There is.

However, such a control system has the following problems.

1. The machine operation sequence is input to the NC device via tape, but if the tape reader makes a reading error, the operation sequence will not proceed normally.

In the arithmetic circuit of the 2NC device, the feed amount of the tool is calculated based on a certain function with respect to the rotation angle of the crankshaft, but if a calculation error occurs, normal machining cannot be performed.

F3 Pulses are distributed to the drive circuit based on the calculation results from the arithmetic circuit, but if the drive circuit has missing pulses or exceeds the number of pulses, normal machining cannot be performed.

When this occurs, the synchronization between the rotation of the workpiece, the tool feed, and i is disrupted, making it impossible to perform normal machining operations. At the same time, the tool may run out of control, damaging the tool or damaging the workpiece, resulting in production and economic problems. This is extremely inconvenient.

In other words, in conventional control systems, if a reading error occurs in the tape reader, a calculation error in the computer's arithmetic circuit, or an error in the pulse distribution circuit occurs, the drive unit cannot be operated according to the correct operation sequence. are doing.

The present invention was made in view of the above circumstances, and its purpose is to provide a numerical control system that can detect the occurrence of reading errors in a tape reader, calculation errors in a computer's arithmetic circuit, errors in a pulse distribution circuit, etc. An object of the present invention is to provide a check system in a control system of an apparatus.

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

The tape reader 13 of the NC device 2 reads the operation sequence (command) applied to the tape 1, but as shown in FIG.
The tape reader 13 reads this content twice.

At this time, the twice reading circuit 14 receives and stores this command value D when the tape reader 13 is reading the first D, and then twice when the tape reader 13 reads the next D. The reading circuit 14 compares the stored value of the first D to check whether the tape reader 13 is correctly reading the first D and the subsequent D without making a reading error. Similarly, all the commands on tape 1 have the same contents twice, and the double reading circuit 14 checks whether there are any mistakes in reading the tape reader 13 for all the commands. If so, an alarm (warning) A will be generated. That is, as shown in FIG. 3, data (commands) from the tape reader 13 are connected to a decoder 30 in the NC device 2, and also to a first memory M1 and a second memory M2.

C1 is a binary counter which is inverted every time the CR code commanding the plotter of tape 1 comes.

Since the binary counter C1 is initially reset, the R terminal is set to 1.

In this state, when the tape reader 13 reads data from tape 1, the data is input to the decoder 30 of the NC device 2, and is stored in the first memory M1 when R of the binary counter C1 is 7r. I'll keep it.

When the reading of data for one block is completed, since a CR code is written on the tape 1 to indicate the end of the block, this command is decoded by the decoder 30 and a CR signal is given to the binary counter C1, which is inverted and R is input. becomes “O” and S
becomes 7.

The tape reader 13 continues reading the next data, but since the S terminal of the binary counter C1 becomes 1, the tape reader 13 continues reading the next data.
The data of No. 3 is input to the NC device 2 and the second memory M2, and this data is stored.

When the data of one proc is completed, the tape 1 receives a proc end command.

Since the CR code is input, this CR code and the S terminal of the binary counter C1 are connected to the gate G1, so this gate G1 is set to 0N and a comparison command is given to the comparator 31. At this time, the comparator 31 is the first memory M] and the second memory M
2 and when a difference is found in each data, an alarm signal A'' is generated.

The tape reader 13 is R when the binary counter S terminal is 1.
When the code is read, StOp is performed.

The binary counter C1 is designed to be inverted when the CR signal falls.

Further, the timing of each signal is as shown in FIG. Next, the signal from the tape reader 13 is input to the computer 15, and based on this, the feed amount of the tool relative to the rotation angle of the crankshaft is calculated and stored, and the result is necessary for the pulse distribution circuit. The arithmetic circuit of the computer 15] 5a calculates according to y=f (θ) as shown in FIG.
Feed amount Y1 at any angle within the range of ゜~180゜
is calculated, and then the feed amount Y2 at an arbitrary angle within the rotation angle range (180° to 360°) is calculated.

On the other hand, the data check circuit 16 is connected to the arithmetic circuit 15a (
Compare and check the data of the first time and the data of the second time, but the method of checking is based on the rotation angle θ゜
≦180°) and -Y2 at a rotation angle (360-θ)° are compared to see if Y1 - Y2 are the same, and if they are not the same, an alarm (warning) B is generated.

If they are the same, the data Yl and Y2 are input to the memory circuit 15b and are called out as necessary to the pulse distribution circuit 1.
It will be sent to 7th.

When the pulse distribution circuit 17 receives a signal from the computer 15, it operates the work rotation motor 5, based on the signal.
A signal is pulse-distributed to the tool feed motor 13, and a certain number of pulses are sent to each motor drive circuit 3a, 5a.

Reference numeral 18 denotes a pulse distribution check circuit, into which the number Nt of pulses output from the pulse distribution circuit 17 is input, and on the other hand, the signal (pulse number Nt) input from the computer 15 to the pulse distribution circuit 17 is input. )
N, is received and stored, and the remaining number of pulses NS after being output from the pulse distribution circuit 17 to the motor drive circuit.
(remaining movement amount) and pulse distribution check circuit 18
Then, calculate NS+Nt=NO, and check whether N,=NO every time one pulse is output from the pulse distribution circuit 17 until all pulses N are output, and then calculate N, -N.
If O is maintained, it is normal, but if N or \NO, an alarm (warning) C is generated.

That is, as shown in FIG. 6, Nt is N, based on the distribution data of the pulse distribution circuit 1.
This pulse Nt is counted by a counter 32 in the pulse distribution check circuit 18.

Add this count value. 33, and input the remaining movement amount data Ns from the pulse distribution circuit 17 to the P terminal of the adder 33. input to the terminal. Distribution data N, is stored in memory 34 within pulse distribution check circuit 18. The comparator 35 constantly compares and checks the contents of the memory 34 and the contents of the output 0 of the adder 33.
When the output MO of the adder 33 becomes no longer equal to the output 0 of the adder 33, it is because some abnormality has occurred in the pulse distribution circuit 17, and an alarm C is generated. Further, the counter 32 is cleared by a signal C so that it is cleared once when data is stored in the memory 34.

As described above, the tool feed motor is controlled based on the tape command while repeating each check in the control system, so if there is an abnormality in the eight steps mentioned above, an alarm is generated. Since the machine can be stopped, reading errors by the tape reader 13, calculation errors by the arithmetic circuit 15a, and pulse distribution circuit 17, as in the conventional case, are avoided.
The rotation of the workpiece and the feed of the tool can be completely synchronized, allowing machine operation with higher production efficiency.

Although the above embodiment has been described in the case of machining a crankshaft, the present invention is not limited to this, but can be used as a check system in the control system of an Nc device when controlling the operation of a drive body based on the operation sequence applied to the tape. Of course, it can also be used. Since the present invention is configured as described above, reading errors by the tape reader 13, calculation errors by the computer 15, and pulse distribution errors can be detected.

Therefore, it is possible to detect and prevent the driver from performing an operation other than the operation sequence.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall explanatory diagram, FIG. 2 is an explanatory diagram of the data application state of the tape, FIG. 3 is a detailed explanatory diagram of the two-time reading circuit, and FIG. FIG. 4 is a table showing timings of various signals in FIG. 3; FIG. FIG. 5 is an explanatory diagram showing calculation data in the calculation circuit 15a, and FIG. 6 is a detailed diagram of the pulse distribution check circuit. 1 is a tape, 13 is a tape reader, 14 is a two-time reading circuit, 15 is a computer, 16 is a data check circuit, 17 is a pulse distribution circuit, and 18 is a pulse distribution check circuit.

Claims (1)

[Claims] 1. In the control system of the numerical control device, which includes a tape reader 13 that reads commands applied to the tape 1, a computer 15 with calculation and storage functions, and a pulse distribution circuit 17, various command contents are processed for each command content. The tape reader 13 reads the command contents of the tape 1 twice, and the double reading circuit 14 checks whether the contents read twice are the same. a data check circuit 16 that causes the computer 15 to perform calculations twice based on the command contents and checks whether the calculation results are the same both times;
The number of pulses Nt that the pulse distribution circuit 17 outputs to the drive circuit based on the command content from the computer 15.
a counter 32 for counting the computer 1;
A memory 34 that stores the number N_1 of pulses from 5, the remaining number NS of pulses in the pulse distribution circuit 17 at the time of output from the pulse distribution circuit 17 to the drive circuit, and the number N of pulses
a pulse distribution check circuit 18 comprising an adder 33 for adding t and a comparator 35 for comparing the output of the adder 33 with the value in the memory 34 and outputting a signal when there is a mismatch;
A check system for a control system of a numerical control device, characterized in that it is provided with: