JPH01191902A - Numerical control system - Google Patents

Abstract

PURPOSE:To improve the numerical control efficiency to avoid such a case where the difference exceeds the prescribed value between the stored total time needed for execution of data of each executing form and the total time required to read out those stored times. CONSTITUTION:An NC device includes an executing time calculation part 12, an executing time reading part 13 and an executing data generating/executing part 14. The part 12 stores the data SC on the executing form received from an executing data generating part 3 into an idle buffer of a memory in its direct form SP and at the same time calculates the executing time SQ based on the moved distance and the feeding speed of said data SC to store this time SQ in 1:1 into said idle buffer. The part 13 reads the data SR on the executing form and its executing time SS out of a memory 11 every block and for each reading command ST given from a function generating part 4. Then the part 14 compares the total executing time with the prescribed reference time for output of an executing data generating command SW and an executing data generation stop command SX. Thus, the satisfactory executing data are always secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Usage in Business) The present invention relates to a numerical control method for controlling a drive section of a machine using a program.

(Prior Art) FIG. 3 is a block diagram showing an example of a numerical control (hereinafter referred to as NC) device that realizes a conventional numerical control method.
Execute part program S^ from input device 1 such as keyboard or tape reader Read command SE from data generation unit 3
A program reading section 2 reads one block at a time, and one block of data SB from the program reading section 2 of
For example, it is converted into execution format data SC consisting of target values, feed speeds, spindle rotation speeds, etc. that take into account origin offset data and tool offset data, and the buffers (1 to N shown in Fig. 4) in the memory 7 are empty. , and further determines whether there is an empty buffer in the memory 7,
If it is determined that there is an empty buffer based on the signal SD from the memory 7, a reading command SE for the next block is output to the program reading section 1, and it is determined that there is no empty buffer based on the signal SD from the memory 7. In this case, the execution data generating section 3 stops converting data into an executable format until an empty buffer is created. Then, there is a function generating section 4 which reads l blocks of the oldest executable format data SF among the executable format data SC stored in buffers 1 to N in the memory 7 and generates a function;
and a drive control section 5 that controls the drive section 6 according to a function SG from .

(Problems to be Solved by the Invention) In the conventional numerical control method using the NC device described above, the number of buffers in the memory is N multi-stage, and N blocks are always converted into executable data during program operation. That's what I do. By doing this, you can solve the problem that occurs when blocks with short execution times are issued in succession, namely 1.
It is possible to prevent the drive unit from stopping, which occurs when data in the executable format of the next block has not yet been generated at the time when the function generation of the block is completed. However, even if a block with a long execution time, such as a positioning command or a fixed cycle command, is issued in succession, the data is always converted into N execution format data, so the program operation is temporarily interrupted and the operator intervenes. If you perform an operation (M
The DI (Manual Data Input) operation function (inputting commands such as changing offset values) has a drawback in that manual input commands cannot be executed by intervention unless the user waits until the completion of execution of data in N execution formats.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a numerical control method that can execute commands input by intervention operations during program operation in a short period of time.

(Means for Solving the Problems) The present invention sequentially reads consecutive blocks on a program, converts them into executable data, sequentially stores the converted executable data, and stores the stored executable data. The present invention relates to a numerical control method for controlling a drive unit by sequentially reading and executing, and the above object of the present invention is to
When sequentially storing and sequentially reading data in the executable format,
The time required to execute the data of each executable format is stored and read out sequentially, and the difference between the sum of the stored and read times exceeds a predetermined time. Not as mentioned above.

This is accomplished by coordinating conversion, storage, readout, and execution operations.

(Function) In the numerical control method of the present invention, since the execution format data is always prepared without excess or deficiency, it is possible to perform stable and efficient control regardless of the length of execution time of each block.

(Embodiment) Fig. 1 is a block diagram showing an example of an NC device that realizes the numerical control method of the present invention in correspondence with Fig. 3, and the same components are given the same reference numerals and explanations are omitted. do. This NC device receives execution format data SC from the execution data generation section 3.
is stored in the empty buffer (for example, N) of the buffers (1 to N shown in FIG. 5) in the memory in the format SP as it is, and the execution time SQ is calculated based on the moving distance and feed speed in the execution format data SC. an execution time calculation unit 12 that calculates the execution time SQ and stores the calculated execution time SQ in a buffer tH that corresponds one-to-one to the buffer N in which the execution format data SP is stored;
and the corresponding execution time SS to the function generator 47>)
The execution time reading unit 13 reads one block at a time for each read instruction ST from the execution time reading unit 13, and the execution time (of the block that is not executed) Su from the execution time calculation unit 12 is sequentially added. Execution time (of the block being executed) SV is successively subtracted from the execution time added above to obtain the total execution time, and this total execution time is compared with a predetermined reference time to determine whether the total execution time is better. It is comprised of an execution data generation execution determination unit 14 which outputs an execution data generation command SW to the execution data generation unit 3 when the total execution time is smaller, and outputs an execution data generation stop command SX to the execution data generation unit 3 when the total execution time is greater.

In such a configuration, the operation will be explained using the flowchart shown in FIG.
reads one block of part program SA from and outputs it to the execution data generation section 3 (step 51), and
The execution data generation section 3 converts one block of data SB into execution format data SC and outputs it to the execution time calculation section 12. Furthermore, the execution time calculation unit 12 calculates the data S in the execution format.
C is stored in the empty buffer (for example, 1) in the memory 11 in the form SP as it is (step S2), and the execution time SQ is calculated from the moving distance and feed speed in the data SC of the execution form. Buffer t1 that corresponds one-to-one to buffer 1 in which data SP is stored
(step S3), and further outputs the calculated execution time SO to the execution data generation execution determination section 14. Then, the execution data generation execution determination unit 14 compares the execution time Su1, that is, the execution time of the block that has not yet been executed, with a predetermined reference time (step S4).In this case, since it is still the first block, the execution time Since the time is smaller than the reference time, the execution data generation execution determination section 14 outputs an execution data generation command SW to the execution data generation section 3. Then, the execution data generating section 3 outputs a reading command SE to the program reading section 2 (steps 55 and 56), and step S
Return to ]. The operations described above (steps 5l-56
) until the sequentially added execution time exceeds the reference time.
Alternatively, the process is repeated until there are no empty buffers in the memory 11.

On the other hand, in the execution time reading section 13, data SR of the oldest execution format and its corresponding execution time S are read from the memory 11.
S (in this case, what is stored in the buffer! and Ll) and sends the executable data SF to the function generator 4.
Output to. Then, the function generator 4 generates a function SG based on the executable data SF, and the drive controller 5 controls the drive unit 6 in accordance with this function SG. When one block of function generation is completed, the function generation section 4 outputs a read command ST to the execution time reading section 13. The above-described operation is repeated as long as there is data in the memory 11.

By the way, the execution time S read out by the execution time reading unit 13
Since S is the execution time of the block being executed, this execution time SV is subtracted from the execution time that has been sequentially added in advance by the execution data generation execution determination unit 14 to obtain the total execution time, and this total execution time is Based on this, the operations from step S4 onward in FIG. 2 are performed.

However, if blocks with short execution times are commanded consecutively, the multi-stage blocks will be converted to executable data by the time the total execution time of the blocks that have not yet been executed becomes greater than a predetermined reference time. Therefore, after one block of function generation ends on the function generation side, data in the executable format of the next block is always generated, so the machine drive unit does not stop, and blocks with long execution times are If commands are issued continuously, the total execution time will be longer than the standard time for a small number of blocks, so even if an intervention operation is performed during program operation, the operator's commands can be completed by simply waiting for the execution of a small number of blocks. executed.

(Effects of the Invention) As described above, according to the numerical control method of the present invention, it is possible to smoothly control the blocks that make up the program regardless of the length of execution time, thereby increasing work efficiency. Productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an NC device that implements the numerical control method of the present invention, FIG. 2 is a flowchart explaining an example of its operation, and FIG. 3 is a block diagram of an NC device that implements the conventional numerical control method. A block diagram showing an example, FIG. 4 is a conventional N
FIG. 5 is a diagram showing an example of a buffer in the memory of the C device. FIG. 5 is a diagram showing an example of the buffer in the memory of the NC device of the present invention. l...Input device, 2...Program reading section, 3...
- Execution data generation unit, 4... Function generation unit, 5... Drive control unit, 6... Drive unit, 7.11... Memory, 1
2... Execution time calculation unit, 13... Execution time reading unit,
14... Execution data generation execution determination unit. Applicant's agent: Yasuo Yasuo

Claims (1)

[Claims] 1. Sequentially reads consecutive blocks on the program and converts them into executable format data, sequentially stores the converted executable format data, and controls the drive unit by sequentially reading and executing the stored executable format data. In the numerical control method, when the data in the executable format is sequentially stored and read out sequentially, the time required to execute the data in each executable format is stored and read out sequentially, and The numerical control method is characterized in that each of the reading, converting, storing, reading and executing operations is adjusted so that the difference between the sum of the read times and the sum of the read times does not exceed a predetermined time. .