JPS59189411A - Numerical control device - Google Patents

Abstract

PURPOSE:To obtain a device which reduces a work quantity executed by a numerical control device at the time of a mechanical operation and executes at a high speed an information processing in the course of the mechanical operation, by providing a command memory for storing an execution command data of an all program portion on the post-stage of a central processing unit. CONSTITUTION:A command memory for storing an execution command data of an all program portion is provided on the post-stage of a central processing unit. For instance, a part program 1 generated by a user is read in advance into a program memory 2 through the central processing unit CPU3 by a command from a console 6, and also a moving command of one block portion and a mechanical control command are read out to a command memory 9 from a program memory 2 and stored temporarily. Subsequently, an execution block pointer is set to the command memory 9 by depressing a start switch of a mechanical operating board 8, and its contents are transferred to an interpolator 4 and a mechanical interface 7. Thereafter, a mechanical operation is started through the mechanical interface 7, also a command is sent out to a servo-mechanism 5 through the interpolator 4, and a load part is operated.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a numerical control device, and more specifically, the present invention relates to a numerical control device.
This invention relates to a numerical control device that can speed up command data creation and automatically program.

[Prior art]

A conventional numerical control device of this type has a configuration as shown in FIG. In FIG. 1, 1 is a part program created by the user, 2 is a program memory that reads the program, and 3 is a central processing unit that reads a program arbitrarily from the program memory 2 and performs arithmetic processing such as decoding the contents. (hereinafter referred to as CPU), 4 is a data interpolator, 5 is a servo mechanism, and the interpolator 4 may be a dedicated hardware configuration, a local microcomputer, or virtually as software executed by the CPU 3. There are several types of configurations, but for example, it is based on a dedicated nodeware configuration, which interpolates between two specified points at a specified speed using a specified method such as circular arc, straight line, acceleration/deceleration, etc. This configuration is such that a command is output to the mechanism 5 to operate the cage portion shown in the figure. 6
is a console that displays the current position of the load section, the part program being executed, etc., and has a keyboard and a CRT display. 7-digit machine interface and 8-digit machine operation panel are shown.

According to the configuration shown in FIG. 1, first, one part program created by the user is read into the program memory 2 in advance by a command from the console 6, and when machine operation is started by a subsequent command from the machine operation panel 80, the CPU 3B program memory 2 One block's worth of part program is read out, the contents are decoded, coordinate calculations and various other processes are performed, and one block's worth of movement commands, display data, machine control signals, etc. are created. These data are sent to the interpolator 4, console 6, and machine interface 7, respectively, to perform operations according to the part program. Then, the interpolator 4 performs interpolation between two specified points at a specified speed using a specified method such as arc, linear, acceleration/deceleration, etc., and outputs a command to the servo mechanism 5 to operate a load portion (not shown).

On the other hand, the console 6 displays the current position of the load section, the part program being executed, etc., and informs the operator of the apparatus. Machine interface 7 is M, S, T
Outputs signals, etc. to perform machine operations other than position control.

When these operations for one block are completed, the next block is taken out and the same process is repeated until the end of the part program.

In this way, the conventionally configured numerical control device was of an integrator type that decoded and executed the part program one block at a time. When using this method for metal processing, etc., the cutting speed is relatively slow (about several 10011 m/Nn).
Even if the command data is created block by block using an interpreter method by reading several blocks in advance and buffering, the command data can be created sufficiently quickly compared to the movement of the machine. There is no risk that the machine will stop temporarily in order to make time for the machine to move, causing a shock or damaging the workpiece.75
) ivy.

However, as the application of numerical control expands, when performing intricate wheel machining on soft non-metallic materials, commands may be given to connect short straight lines or arcs of short blocks at high speed. In this case, there was a problem that the instructions could not be created in time and the machine would stop temporarily. For example, in the case of a cutting device, when the cutting speed is 15 m/m, it takes only 40 m5eci degrees to move IQsun, so it is very difficult to create and execute a command in this time.

That's naive. With this type of numerical control machine, one program processes many of the same items, so the same decoding and calculation process is repeated every time it is processed, resulting in a row fi5.
It takes up a lot of CPH machine time, and if you want to create a new part program or display graphics during machining, you will have to take expensive measures such as using high-speed hardware or using multiple CPUs. There wasn't.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to reduce the amount of work performed by a numerical control device during machine operation and to increase the information processing speed during machine operation.

[Summary of the Invention] The present invention is capable of outputting commands without delaying the operation of mechanical parts during high-speed operation control, maintaining continuity of machine operation, and performing automatic programming in parallel during machine operation. In order to do this, we use the time when it is not operating to perform processing control, and create commands to the mechanical parts in advance and store them in the memory part of the numerical control device. It is designed to read and execute created commands.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4. FIG. 2 is a block diagram of the numerical control device, and the same reference numerals as in FIG. 1 have the same functions. In FIG. 2, a command memory 9 is provided between the CPU 3 and the interpolator 4.
The movement command and machine control command signal for one block read out in step 3 are temporarily stored in this command memory 9.

The internal configuration of this command memory 9 is as shown in FIG. 3, including (a) control flag, (b) interpolation mode, and (c) acceleration.
velocity, (e) slope, (f) end point, ()IM -S -T
Consists of signals, etc. Since the interpolator 4 is configured by hardware in this embodiment, the coordinates,
In addition to the speed and interpolation method, it is necessary to specify the acceleration of acceleration/deceleration, the slope of the straight line, etc., so these calculations are also performed at the time of command creation and stored in the command memory 9. The control flag (a) stores information for controlling the execution order of blocks such as optional block skipping and subprograms, and information for controlling execution processing such as whether or not to move. Further, the M·S@T signal (g) is stored in the form of a BCD code to be output to the machine interface 7. Furthermore, the interpolation mode (b) is straight line - circular arc, straight line - exponential acceleration/deceleration,
It stores information such as synchronous/asynchronous feeding, end point detection axis designation, etc.

The instruction memory 9 created in this manner is executed in accordance with the procedure shown in chart 70 of FIG. That is, when the start switch shown on the machine operation panel 8 in FIG. 2 is pressed, the execution block pointer (c) shown in FIG. 3 is placed at the beginning of the command memory 9 to prepare for machine operation. Then, the contents of the command memory 9 indicated by the execution block pointer (a) are transferred to the interpolator 4 and the machine interface 7.
to start the machine operation. When the machine operation is completed and the M/S-T operation is completed, the execution block pointer (g) is controlled by the plug-in as the execution of the block is completed.
and execute the next block.

When the program end code is detected, execution end processing is performed to end the execution of the part program.

The processing at the time of execution is simply to update the execution block pointer and transfer the contents of the command memory 9 indicated by this to the interpolator 4 and the machine interface 7, so that processing can be performed at high speed. In this embodiment, the transfer and execution are performed by the cPU 3, but the execution part of this command memory 9 is made into hardware, and the subsequent execution is performed automatically by simply transferring the created command to the CPU 3Fi command memory. This also makes it possible to perform even faster processing.

When using the above compiler method, two problems remain: how to display the program being executed and how to deal with part programs that are changed during execution. , which displays the part program and is useful when checking the program. In this embodiment, as described above, one block completes in 10 milliseconds, so even if the program is displayed, the operator cannot be identified, so this display is omitted.

Furthermore, considering various applications, it is better to display the program, so the block number is stored in the control flag, and at the time of execution, the corresponding block in the program memory 2 is read out again and displayed. Furthermore, if a low-speed device is used for the program memory 2, it may not be possible to read and display the data in several tens of milliseconds, but since the operator cannot identify it, there is no problem even if the display is delayed. Another solution is to set up a conventional interpreter-based execution mode for checking, since there is little need to display the program when machining is performed continuously. After checking, there is a method to perform continuous machining using a compiler method without displaying the program.

Part programs that are changed during execution include one tool compensation (for example, in the case of a processing device, the cutting tool is moved until it hits the senna and the tool compensation value is changed based on the actual measurement length, so the locus of subsequent blocks will change). ), manual intervention (pauses during automatic operation, moves manually, and then executes the next block, so the trajectory of the next few blocks changes), override (when the feed rate and spindle rotation speed are being programmed) (multiply by the specified coefficient). Additionally, if the command coordinates change due to automatic tool compensation or manual intervention, the command coordinates must be recompiled to recalculate the command coordinates. However, there is no need for continuity in machine operation to begin with, so this is not a problem.

Regarding overrides, conventional methods have been used such as stopping interpolation and resetting the speed so that changes can be made even in the middle of a block, but in the case of this example, it is not possible to change the feed rate in the middle of a block because it is not in time. Instead, when the speed data in the command memory 9 is transferred to the interpolator 4 for each block, the speed is changed by multiplying it by an override coefficient. Furthermore, if it is necessary to change the speed in the middle of a block, a hardware multiplier is provided between the interpolator 4 and the servo mechanism 5, and the speed can be changed at any timing by multiplying by an override coefficient.

According to the numerical control device using the compiler system as described above, it is possible to output commands without delaying the operation of the machine part during high-speed operation control, thereby maintaining the continuity of the processing machine. Furthermore, since automatic programming and the like are performed in parallel during machine operation, the information processing speed during machine operation is increased.

Therefore, for example, a combination of fast and short blocks can be
In machining, high-precision machining can be achieved because the continuity of motion can be maintained. Furthermore, since the load on the CPU during operation is reduced, more parallel processing is possible, and new part programs and graphic displays can be created and displayed at high speed.

[Effects of the Invention] As is clear from the above-mentioned embodiments, according to the present invention, a command memory is provided to store execution commands created for the entire program before execution of the part program, and the commands are read during execution. Since the contents of the memory are read out and the part program is executed as shown in line 15, the amount of work required by the numerical control unit during machine operation is extremely small, and part program creation and graphic display can be done at high speed. There are advantages.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional numerical control device, FIG. 2 is a block diagram of a numerical control device showing an embodiment of the present invention, and FIG.
The figures are diagrams explaining the internal configuration of the command memory in Figure 2, and Figure 4.
The figure is a flowchart explaining the processing procedure when executing the command memory. 01...Part program, 2...Program memory, 3...CPU, 11...Interpolator, 5...
...Servo structure, 6...Console, 7...Machine interface, 8...Machine operation panel, 9...Command memory Father Rin 1 Figure Freeze 2 Figure 51

Claims (1)

[Claims] A part program is stored in advance in a program memory based on a command from the console, and the operation of the drive unit is started based on a command from the machine operation panel. When the operation of the drive unit starts, the central processing unit writes one block of the part program from the program memory. It requests the information, deciphers the content, performs arithmetic processing such as coordinate calculations, creates and outputs movement commands, display data, machine control signals, etc. for one block program, and controls the operation of the drive unit based on this data. In the numerical control system, a command memory is provided downstream of the central processing unit to store execution command data for all programs created in the program memory, and when a program execution command is received, the command is A numerical control device configured to read out certain data stored in a memory and control the operation of a drive unit according to a part program.