JPH01311304A - Numerical controller - Google Patents

Abstract

PURPOSE:To simultaneously check the coordinate position of a machine and a work position based upon a program without moving a driving mechanism to be controlled by processing a numerical control instruction based upon the program including a moving command in the locked state of the driving mechanism. CONSTITUTION:When a machine lock command is applied to a control part, a command pulse is stored in the 1st memory area 11, a servo operation part 13 is disconnected from a data bus 2 and only the updating of program coordinates is executed in the machine lock state. When a simulation mode command is applied, the operation part 13 is recognized as a working simulation mode, the machine coordinate value updated based upon the command pulse is stored in a memory 12 through the operation part 13 and an interruption control part 15 interrupts between a servo motor 14 and the operation part 13 and a feedback loop to update only the machine coordinates.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a numerical control device having a function of checking a machine program of a machine tool or the like without moving a controlled object.

(Conventional technology) When operating a normal numerically controlled machine tool, the operation commands necessary for machining and machining the workpiece are read from the NC tape, and command pulses are sent to the servo motor by forming data for tool movement, etc. It is given. The NC tape is created for each part program, and contains calculation instructions for determining tool coordinate values by the processor of the numerical control device,
This includes the tool feed rate and other auxiliary function commands necessary for machining.

However, if there is a programming error in the part program or a setting error in various parameters set depending on the type of machine tool, when the machine tool is actually operated using such NC tape, the tool may be damaged. , resulting in wasted work.

・Therefore, prior to actual operation, it has been necessary to perform a simulation using NC Broaderum.

In other words, in reality, the machine tool operator reads the NC tape without outputting a movement command, and displays the command data at that time on, for example, a display for checking. Such a simulation check of NC programming has conventionally been performed using a machine lock function of a numerical control device.

(Problems to be Solved by the Invention) NC programs read into such numerical control devices are generally designed to be compatible with multiple machine tools, and on the other hand, the absolute coordinate system actually used is , is determined from the positional relationship between the machine and the workpiece, so conventional simulation checking methods can only check program coordinates (workpiece coordinates) or relative coordinate systems, and the It was impossible to check on the machine coordinates. In addition, it is not possible to check the program due to the relationship with the torque limit set on the movable part of the machine tool, the pitch error correction amount, the backlash correction amount, and other setting parameters.
Further, even if there is no programming error, there is a problem that normal operation may not be possible due to a failure in the internal circuit of the numerical control device, making it impossible to accurately check the program.

The present invention was made to solve the above problems, and
To provide a numerical control device having a program simulation function and capable of simultaneously checking a machine coordinate position and a workpiece coordinate position by executing a program without moving a controlled object driven by a drive mechanism. It is an object.

(Means for Solving the Problems) According to the present invention, a program processes a numerical control command based on a program including a movement command while a drive mechanism to be controlled is locked, and checks program coordinates based on the processing result. In a numerical control device having a simulation function, a storage means for storing a mechanical coordinate position of a controlled object driven by the drive mechanism, a cutoff means for cutting off transfer of a command signal based on the numerical control command, and a cutoff means for the cutoff means. a command means for instructing the storage means to perform a machining simulation using the controlled object, and simultaneously checking the machine coordinate position and the workpiece coordinate position by executing a program without involving the eight shifts of the controlled object. We provide a numerical control device that is characterized by:

(Function) In the numerical control device of the present invention, when checking a program, a machining simulation mode is set internally or by an external command, and command pulses to the servo motor of the machine tool are cut off. It is now possible to check not only in the machine coordinate system, but also in the machine coordinate system.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a numerical control device. 1 is a processing unit fi (MPU) such as a microcomputer
and is connected to the control unit 3 via the data bus 2 etc.
It is configured to control a machine tool 4 connected directly to this control section 3 or together with a sequence controller. 5 is a read-only memory (ROM);
Various system data such as operating programs and parameters are stored here. Reference numeral 6 denotes a read/write memory (RAM) in which system data read from the ROM 5 is stored, and program processing in the processing device 1 is executed based on the system data. Reference numeral 7 denotes a non-volatile memory in which the computer program read from the NC tape is recorded. All of these are connected to the data bus 2, and furthermore, this data bus 2
A manual data input device fi (MDI) 8 such as a keyboard and a display, and an operation panel 9 are connected to the .

Note that the system data includes various parameters necessary for the user to operate the machine tool 4 using the numerical control device. These parameters include, for example, motor characteristic values set for the servo motor of the machine tool 4, feedback loop gains, and the like.

FIG. 2 is a block diagram showing the control section 3 that constitutes the main part of the present invention. The control unit 3 includes a first memory area 11 that stores command pulses output to the machine tool 4, such as movement commands, when a machine lock command is issued, and a machine coordinate area that is updated when a simulation mode command is issued. The second memory area 12 is connected to a servo calculation unit 13 that compares feedback data from the servo motor 14 of the machine tool 4 with command data. A cutoff control section 15 is provided which cuts off the feedback loop between the servo motor 14 and the servo calculation section 13 and the feedback loop when receiving the mode signal.

FIG. 3 is a flowchart illustrating a program check operation in the numerical control device M having such a configuration.

NC data created by a predetermined part program and read from a tape reader (not shown) is stored in the non-volatile memory 7, and when predetermined processing is performed by the MPU, step a) % machine lock command is included therein. It is determined whether or not (step b). If a machine lock command is not included, it is then determined whether a simulation mode command is included (
Step C). If there is no command, a command pulse is output to the servo motor 14 of the machine tool 4,
The movement of the mechanical movable part is controlled according to the NC command (step d).

When a machine lock command is given to the control unit 3, the command pulse is stored in the first memory area 11, and the servo calculation unit 13 is initially activated from the data bus 2 and is in the machine lock state, only updating the program coordinates. (step e). Furthermore, when a simulation mode command is given, the servo calculation section 13 is set to the machining simulation mode, and updated mechanical coordinate values based on the command pulse are stored in the second memory area 12 via the servo calculation section 13. At the same time, the cutoff control unit 15 cuts off the command cable and the feedback loop between the servo motor 14 and the servo calculation unit 13, respectively, and only the machine coordinates are updated (
Step f). In this case, the machine coordinate value includes the sum of the workpiece offset amount, pitch error correction amount, backlash correction amount, etc., and the amount of sliding movement is calculated in the machine coordinate system corresponding to the actual machine position with the machine locked. Checking becomes possible (step g).

Further, even when the operation panel 9 is operated manually, it is also possible to perform a simulation check without actually moving the movable parts of the machine tool 4. It should be noted that the description of the embodiment described above is a preferred example of the device of the present invention, and it is known to those skilled in the art that various modifications and applications can be made to the present invention without departing from the spirit and gist thereof. Anyone with this technology can understand this.

(Effects of the Invention) As explained above, according to the numerical control device of the present invention,
When performing a machining simulation, a machining simulation mode is created manually using external signals or setting data for internal parameters, and when executing a program check, it is possible to check not only program coordinate values but also machine coordinate values.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing the control section 3 that constitutes the main part of the present invention, and FIG. 3 is a flow chart explaining the program check operation. It is. 1... Processing unit (MPU), 3... Control unit, 4...
·Machine Tools. Patent applicant: Representative of FANUC Co., Ltd. Patent attorney: Minoru Tsuji Figure 1 Figure 3 C B

Claims (1)

[Claims] A numerical control device having a program simulation function that processes a numerical control command based on a program including a movement command while a drive mechanism to be controlled is locked, and checks program coordinates based on the processing result, wherein the drive mechanism is driven by the drive mechanism. a storage means for storing a machine coordinate position regarding a controlled object; a blocking means for blocking transfer of a command signal based on the numerical control command; and an instruction to the blocking means to instruct the storage means to perform a machining simulation using the controlled object. 1. A numerical control device comprising a command means for simultaneously checking a machine coordinate position and a workpiece coordinate position by executing a program without moving the controlled object.