JPH08263120A - Current position display system for cnc - Google Patents

Abstract

PURPOSE: To display a current position that an operator desires on a transformed coordinate system by the current position display system for the CNC which displays the current coordinate position of a tool. CONSTITUTION: A program storage means 1 is stored with a machining program 1a. A transformation condition command means 2 commands conditions of coordinate transformation from an absolute coordinate system commanded by the machining program 1a to an optional relative coordinate system. A coordinate system arithmetic means 3 transforms the absolute coordinate system into the relative coordinate system under the commanded coordinate transformation conditions. A program executing means 4 executes the machining program 1a to control a servo amplifier 5 and then a servo motor 6 is driven to move the tool 7, thereby machining a work 8. During the machining, a display control means 9 computes the current position of the tool 7 on the relative coordinate system computed by the coordinate system arithmetic means 3 and displays it on the screen 10a of a display unit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CNC current position display system for displaying the current coordinate position of a tool, and more particularly to a CNC current position display system for displaying the current position of a relative coordinate system.

[0002]

2. Description of the Related Art Conventionally, when a CNC (numerical control device) machining program is executed, the current coordinate position can be displayed on a screen. This coordinate position is displayed using the absolute coordinate system (work coordinate system) commanded by the machining program.
There is a current position above, a current position on a relative coordinate system, and a current position on a machine coordinate system. The operator can give an instruction to display the current position on the desired coordinate system by operating the operation panel. Also, these coordinate systems can be displayed on the same screen.

[0003]

However, in the conventional display of the current position, the relative coordinate system can be displayed only when the absolute coordinate system is translated. Therefore, the position display corresponding to various conversions cannot be performed.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a current position display system of a CNC capable of displaying a current position on a conversion coordinate system desired by an operator. .

[0005]

In order to solve the above problems, the present invention provides a CNC for displaying the current coordinate position of a tool.
In the present position display method, program storage means for storing a machining program, conversion condition command means for commanding a coordinate conversion condition from the absolute coordinate system commanded by the machining program to any relative coordinate system, and the command Coordinate system calculation means for converting the absolute coordinate system to the relative coordinate system based on the coordinate conversion conditions, program execution means for executing the machining program, and the current position of the tool on the calculated relative coordinate system. A present position display system of a CNC is provided, which comprises display control means for calculating and displaying on a screen.

[0006]

The program storage means stores the machining program. When the conversion condition command means issues a coordinate conversion condition from the absolute coordinate system commanded by the machining program to an arbitrary relative coordinate system, the coordinate system calculation means makes the absolute coordinate system move relative to the absolute coordinate system based on the commanded coordinate conversion condition. Convert to coordinate system. When the program executing means executes the machining program, the display control means calculates the current position of the tool on the calculated relative coordinate system and displays it on the screen.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the concept of the function of this embodiment.
A machining program 1a is stored in the program storage means 1. The conversion condition command means 2 is the machining program 1
Command the coordinate conversion conditions from the absolute coordinate system commanded in a to an arbitrary relative coordinate system. The coordinate system calculation means 3 converts the absolute coordinate system into a relative coordinate system based on the commanded coordinate conversion condition.

The program executing means 4 is the machining program 1
By executing a, the servo amplifier 5 is controlled, the servo motor 6 is driven to move the tool 7, and the work 8 is machined. During machining, the display control means 9 calculates the current position of the tool 7 on the relative coordinate system calculated by the coordinate system calculation means 3 and displays it on the screen 10a of the display device 10.

FIG. 2 is a block diagram showing a schematic configuration of the hardware of the numerical control device that implements the above functions. The numerical controller is mainly composed of the processor 11.
The processor 11 controls the entire numerical controller according to the system program stored in the ROM 12. EPROM or EEPROM is used for the ROM 12. Also, a flash ROM is used in some cases.

An SRAM or the like is used for the RAM 13,
Temporary calculation data, display data, input / output signals, etc. are stored. The non-volatile memory 14 uses a CMOS backed up by a battery (not shown), and stores parameters, machining programs, tool correction data, pitch error correction data, etc. that should be retained even after the power is turned off.

The CRT / MDI unit 20 is arranged on the front surface of the numerical controller or at the same position as the machine operation panel.
Used for displaying data and graphics, inputting data, and operating numerical control devices. Further, the current position of the relative coordinate system described later is also displayed. The graphic control circuit 21 converts digital signals such as numerical data and graphic data into raster signals for display and sends them to the display device 22. Display device 2
2 displays these numerical values and figures. Display device 2
For 2, a CRT or a liquid crystal display device is used.

The keyboard 23 is composed of numerical keys, symbolic keys, character keys and function keys, and is used for creating and editing a machining program and operating the numerical control device. The keyboard 23 is used to input coordinate conversion conditions for relative coordinates, which will be described later, and to issue a current display command for a tool on the relative coordinate system. The software key 24 is provided below the display device 22, and its function is displayed on the display device. When the screen of the display device changes, the function of the software key changes corresponding to the displayed function.

The axis control circuit 15 receives the axis movement command from the processor 11 and outputs the axis movement command to the servo amplifier 1.
6 is output. The servo amplifier 16 amplifies this movement command, drives a servo motor coupled to the machine tool 30, and controls the relative movement of the tool and the work of the machine tool 30. The axis control circuit 15 and the servo amplifier 16 are
The number corresponding to the number of axes of the servo motor is provided.

A PMC (Programmable Machine Controller) 18 is an M processor via a bus 19 from the processor 11.
Receives (auxiliary) function signal, S (spindle speed control) function signal, T (tool selection) function signal, and the like. Then, these signals are processed by a sequence program, and output signals are output, and pneumatic equipment, hydraulic equipment in the machine tool 30,
Controls electromagnetic actuators, etc. Also, the machine tool 30
Upon receiving a signal such as a button signal, a switch signal, and a limit switch from the machine operation panel inside, sequence processing is performed and a necessary input signal is transferred to the processor 11 via the bus 19.

In FIG. 2, the spindle motor control circuit, the spindle motor amplifier, etc. are omitted. In the above example, the number of processors 11 is one, but
It is also possible to use multiple processors in a multiprocessor configuration.

Next, a specific example of the current position display system of this embodiment will be described. FIG. 3 is a diagram showing an example in which the origin position of the relative coordinate system is moved. Here, the relative coordinate system (X
The origin P0 of the a-Ya coordinate system is moved to a point (100, 20) on the absolute coordinate system (XY coordinate system).

FIG. 4 is a diagram showing an example of the current position display when the movement shown in FIG. 3 is performed. Display screen 2 of display device 22
In 2a, the current position in absolute coordinates and the current position in relative coordinates are displayed at the same time. In the setting state of the origin P0 as shown in FIG. 3, the current position in absolute coordinates is (X, Y, Z) = (100.000, 2) as shown in FIG.
0.000, 0.000,), the current position in relative coordinates is (X, Y, Z) = (0.000, 0.000, 0.
000,).

FIG. 5 is a diagram showing a state in which the relative coordinate system is further rotated with respect to the absolute coordinate system from the state of FIG. Here, the relationship between the absolute coordinate system and the relative coordinate system when the relative coordinate system is rotated 45 degrees counterclockwise around the Z axis with respect to the absolute coordinate system is shown. At this time, if the movement to the point P1 where the coordinate value on the absolute coordinate system is (X, Y) = (200.0, 120.0) is performed, the coordinate value on the relative coordinate system of this point P1. Is (X, Y) = (141.4
21, 0.000).

FIG. 6 is a diagram showing an example of the current position display when the conversion of FIG. 5 is performed. The current position in absolute coordinates and the current position in relative coordinates are simultaneously displayed on the display screen 22a as in FIG. Displaying the current position after such rotation conversion has an advantage that it is convenient to confirm the current position on the machining path if a conversion command is issued so that the axis of the relative coordinate system is on the machining path.

As described above, in this embodiment, the coordinate conversion condition from the absolute coordinate system instructed by the machining program to any relative coordinate system can be instructed, and the current position on the instructed relative coordinate system is set. Since it is displayed, the degree of freedom in position confirmation and measurement during processing is increased.

In this embodiment, the current position of absolute coordinates and the current position of relative coordinates are displayed on the same screen, but they may be switched and displayed.
Further, in the present embodiment, an example in which the XY coordinates are rotationally converted is shown in FIG. 5, but rotational conversion including the Z axis is naturally possible. The same applies to a plurality of rotation conversions.

[0022]

As described above, according to the present invention, the coordinate conversion condition from the absolute coordinate system instructed by the machining program to the arbitrary relative coordinate system can be instructed, and the current coordinate on the instructed relative coordinate system can be specified. I've displayed the position, so
The degree of freedom in position confirmation and measurement during processing is increased.

[Brief description of drawings]

FIG. 1 is a diagram showing a concept of functions of the present embodiment.

FIG. 2 is a block diagram showing a schematic configuration of hardware of a numerical control device.

FIG. 3 is a diagram showing an example in which the origin position of the relative coordinate system is moved.

FIG. 4 is a diagram showing an example of a current position display when the movement shown in FIG. 3 is performed.

5 is a diagram showing the relationship between the absolute coordinate system and the relative coordinate system when the relative coordinate system is further rotated 45 degrees counterclockwise around the Z axis with respect to the absolute coordinate system from the state of FIG.

6 is a diagram showing an example of a current position display when the conversion of FIG. 5 is performed.

[Explanation of symbols]

 1 Program Storage Means 1a Machining Program 2 Conversion Condition Command Means 3 Coordinate System Computing Means 4 Program Execution Means 5 Servo Amplifiers 6 Servo Motors 7 Tools 8 Work 9 Display Control Means 10 Display 10a Screen 11 Processor 12 ROM 14 Nonvolatile Memory 22 Display Device 23 Keyboard 30 Machine tool

Claims (4)

[Claims] 1. A CNC for displaying the current coordinate position of a tool.
In the current position display method, program storage means for storing a machining program, conversion condition command means for instructing a coordinate conversion condition from the absolute coordinate system commanded by the machining program to an arbitrary relative coordinate system, and the command Coordinate system calculation means for converting the absolute coordinate system to the relative coordinate system based on the coordinate conversion conditions, program execution means for executing the machining program, and the current position of the tool on the calculated relative coordinate system. A display control means for calculating and displaying on a screen, and a current position display system of a CNC. 2. The current position display system of a CNC according to claim 1, wherein the coordinate conversion condition is a movement amount of an origin of the relative coordinate system with respect to the absolute coordinate system. 3. The current position display system of CNC according to claim 1, wherein the coordinate conversion condition is a rotation amount of the relative coordinate system with respect to each axis of the absolute coordinate system. 4. The current position of the tool on the relative coordinate system is displayed on the same screen as the current position of the tool on the absolute coordinate system.
The current position display method of the described CNC.