JPH0695721A - Numerical controller - Google Patents

Abstract

PURPOSE:To correct a revolving shaft by a working program to shorten the generation time of the working program with respect to the numerical controller provided with a machine tool having the shaft rotating function. CONSTITUTION:A preprocessing means 2 reads out and analyzes the working program to detect a block including a coordinate rotating command and outputs a revolving shaft command. A revolving shaft correcting means 3 detects rotation position coordinates and the rotation angle from the block, which is detected by the preprocessing means 2 and includes the coordinate rotating command, and corrects the coordinate rotating command to obtain the revolving shaft command. A pulse distributing means 4 distributes pulses to a servo motor 27, which rorates a shaft like a C shaft or an A shaft, based on the revolving shaft command obtained by the revolving shaft correcting means 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device equipped with a machine tool having a shaft rotation function, and more particularly to a numerical control device for correcting a rotary shaft based on a command of a machining program to control a servomotor.

[0002]

2. Description of the Related Art Conventionally, in a numerical controller, a work is machined into a desired shape by moving a tool on a machining path designated by a machining program based on a designated feed rate.

A coordinate rotation command is one of the commands described in this machining program. The coordinate rotation command is a command for rotating the shape defined by the shape definition command with the designated rotation angle about the center of rotation coordinates.
Therefore, for example, when the workpiece attached to the machine tool is at a position rotated by a certain rotation angle with respect to the machine coordinates, the coordinates are corrected using the coordinate rotation command to perform the machining.

[0004]

However, in the conventional coordinate rotation command, only the coordinate position of the defined shape is converted into the coordinate position rotated by the designated rotation angle. For this reason, the angle formed between the machined surface of the work and the tool axis differs depending on whether the work is properly mounted or mounted at a certain rotation angle with respect to the machine coordinates. Therefore, there is a problem that a desired processed shape cannot be obtained.

There is also a method of using a macro program in order to make the angle formed by the machined surface of the work and the tool axis the same, but since it is necessary to create a macro separately, considerable labor is required, and However, there is a problem that it takes a long time to create a machining program.

Further, even if the NC function other than the NC function programmed by the macro program is designated in one block of the machining program, it is ignored. For example, when only the G function is programmed in the macro program, another NC function such as the M function or the T function is not executed even if it is designated as one block of the machining program.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a numerical control device that automatically corrects a rotation axis by a machining program and shortens the time for creating the machining program. To do.

[0008]

In order to solve the above-mentioned problems, the present invention reads out and analyzes a machining program to detect a block including a coordinate rotation command and outputs a rotation axis command, and a preprocessing means. Rotation axis correction means for detecting rotation position coordinates and rotation angle from a block including the coordinate rotation instruction, correcting the coordinate rotation instruction to obtain the rotation axis instruction, and outputting to a servo motor based on the rotation axis instruction. And a pulse distributing means for distributing the pulse to be generated.

[0009]

First, the preprocessing means reads each block of the machining program and analyzes it to detect the block containing the coordinate rotation command. Next, the rotation axis correction means obtains the rotation position coordinates and the rotation angle from the coordinate rotation instruction detected by the preprocessing means, corrects the coordinate rotation instruction, and obtains the rotation axis instruction. Further, the preprocessing means outputs the rotation axis command obtained by the rotation axis correction means. Then, the pulse distribution means distributes the pulses to the servomotors based on the rotation axis command output from the preprocessing means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of an interactive numerical control device which is one of the numerical control devices to which the present invention is applied.

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. An SRAM or the like is used for the RAM 13, and various data such as rotational position coordinates or input / output signals are stored therein. For the non-volatile memory 14, a CMOS backed up by a battery (not shown) is used,
Machining programs, parameters that should be retained after power off,
The pitch error correction amount, the tool correction amount, and the like are stored.

The graphic control circuit 15 converts the digital signal into a signal for display and gives it to the display device 16. A CRT or a liquid crystal display device is used as the display device 16. The display device 16 displays a shape, processing conditions, etc. when creating a processing program in an interactive form. The keyboard 17 is composed of symbolic keys, numerical keys, etc., and is used to input necessary graphic data and NC data. The timer 26 ticks the date and time, and outputs them as time data in response to a command from the processor 11.

The axis control circuit 18 receives the axis movement command from the processor 11 and outputs the axis command to the servo amplifier 19. The servo amplifier 19 receives the commands of the axes and drives the servo motors 27 of the respective axes including the A, B, and C axes in addition to the X, Y, and Z axes provided on the machine tool 20.

The above components are connected to each other by a bus 21. A PMC (Programmable Machine Controller) 22 receives a T function signal (tool selection command) and the like via the bus 21 when executing an NC program. Then, this signal is processed by the sequence program, a signal is output as an operation command, and the machine tool 20 is controlled. Further, it receives a status signal from the machine tool 20, performs a sequence process, and transfers a necessary input signal to the processor 11 via the bus 21.

Further, on the bus 21, software keys 23, N whose functions are changed by a system program or the like.
A serial interface 24 for sending C data to an external device such as a floppy disk, a printer, or a paper tape reader (PTR) is connected. The software key 23 is provided on the CRT / MDI panel 25 together with the display device 16 and the keyboard 17.

In addition to the processor 11 which is the CPU for NC, the bus 21 is connected with a dialogue processor 31 having a bus 30. ROM 32 on the bus 30,
The RAM 33 and the non-volatile memory 34 are connected.

The interactive data input screen displayed on the display device 16 is stored in the ROM 32. On this interactive data input screen, the entire motion trajectory of the tool and the like are displayed as a background animation when the NC sentence is created. Further, the work or data that can be set by the input screen is displayed on the display device 16 in a menu format. The item to be selected from the menu is selected by the software key 23 arranged at the bottom of the screen corresponding to the menu. The meaning of the software key 23 changes for each screen. An SRAM or the like is used as the RAM 33, and various data for dialogue are stored.

The input data is the processor 3 for dialogue.
1 is processed to create a work machining program, and a background animation is sequentially displayed on the display device 16 used interactively. The work machining program stored as an NC sentence in the non-volatile memory 34 is also executed during the machining simulation of the machine tool 20, and is displayed in the foreground animation.

FIG. 1 is a diagram for explaining the principle of the present invention. The numerical control device of the present invention includes a preprocessing unit 2 and a rotation axis correcting unit 3.
And pulse distribution means 4. The preprocessing unit 2 and the rotation axis correction unit 3 are functions realized by the processor 11 executing the system program stored in the ROM 12 of FIG. The pulse distributing means 4 corresponds to the axis control circuit 18 and the servo amplifier 19 shown in FIG.

The preprocessing means 2 reads out and analyzes the machining program to detect a block containing a coordinate rotation command, and outputs a rotation axis command. The preprocessing unit 2 performs a predetermined process for the NC function designated in the block including the coordinate rotation command, and outputs the corresponding command to the pulse distribution unit 4. The rotation axis correction means 3 detects the rotation position coordinates and the rotation angle from the block including the coordinate rotation instruction detected by the preprocessing means 2, and corrects the coordinate rotation instruction to obtain the rotation axis instruction. The pulse distribution unit 4 distributes a pulse to the servo motor 27 that rotates an axis such as the C-axis or the A-axis based on a command such as the rotation axis command obtained by the rotation axis correction unit 3.

Next, the operation of the numerical controller according to the present invention will be described. First, the preprocessing unit 2 reads each block of the machining program 1 and analyzes it to detect a block including a coordinate rotation command. Next, the rotation axis correction means 3 obtains the rotation position coordinates and the rotation angle from the coordinate rotation instruction detected by the preprocessing means 1, corrects the coordinate rotation instruction, and obtains the rotation axis instruction. Further, the pre-processing means 2 outputs the rotation axis command obtained by the rotation axis correcting means 3. Then, the pulse distributing means 4 distributes the pulse to the servo motor 27 based on the rotation axis command.

Therefore, the servo motor 27 can be controlled by the rotation axis command in which the rotation axis is automatically corrected based on the coordinate rotation command instructed by the machining program. Therefore, the angle between the machining surface of the workpiece and the tool axis is the same when the workpiece is properly attached and when it is attached at a certain rotation angle with respect to the machine coordinates, and the desired machining shape is obtained. be able to. In addition, it is not necessary to create a separate macro, and it is possible to shorten the creation time of the machining program.

FIG. 3 is a diagram showing an example of a machining program. FIG. 3A shows a uniaxial coordinate rotation command, and FIG.
Indicates a two-axis coordinate rotation command, respectively. It should be noted that the machining program has many other commands such as a return-to-origin command, but they are omitted in the figure.

In the machining program 300 shown in FIG. 3A, the block 301 specifies the coordinate rotation command (G68), and the block 302 specifies the coordinate rotation cancel command (G68).
69) is specified.

Coordinate rotation command of block 301 (G68)
Requires "X-Y-R-" as a parameter.
Among these, "XY-" indicates the center coordinate of coordinate rotation,
"R-" indicates a rotation angle of coordinate rotation. In addition, an appropriate numerical value for performing coordinate rotation is designated as "-". Also,
The coordinate rotation cancel command (G69) of the block 302 cancels the coordinate rotation.

Further, the machining program 310 shown in FIG.
In the block 311, the C-axis coordinate rotation command (G6
8.1) is specified, and the A-axis coordinate rotation command (G68.2) is specified in block 312, and block 3 is further specified.
In 13, the coordinate rotation cancel command (G69) is designated.

A C-axis coordinate rotation command (G6 of block 311)
8.1) and the A-axis coordinate rotation command (G6) of the block 312.
In 8.2), "XYZR-" is required as a parameter. Among these, "XYZ-" shows the center coordinate of coordinate rotation, and "R-" shows the rotation angle of the coordinate rotation of each axis. Note that, as in FIG. 3A, an appropriate numerical value for performing coordinate rotation is designated for "-". Further, the coordinate rotation cancel command (G69) of the block 313 cancels the coordinate rotation. In the above example, the two blocks, blocks 311 and 312, perform the biaxial coordinate rotation command. However, for example, “G68X-Y-Z-
It is also possible to configure so that the coordinate rotation command can be issued by one block like "RC-RA-".

Thus, it is possible to issue a command for uniaxial or biaxial coordinate rotation and cancel the coordinate rotation. The coordinate rotation command and the cancel command can be issued not only by the G function but also by another NC function such as the M function or a comment sentence.

Next, an example of coordinate rotation will be described.
FIG. 4 is a diagram showing coordinate rotation on the XY axis plane.
A workpiece 41 when correctly placed on the XY axis plane, a tool 42 which performs machining when properly placed, a workpiece 43 which is actually placed, a tool 44 before coordinate rotation and a tool 45 after coordinate rotation. It is shown.

In the figure, the work 43 forms a rotation angle c1 with respect to the work 41 about the coordinates (x1, y1). Conventionally, the tool does not rotate even if the coordinate rotation is commanded, and when machining is performed in the axial direction of the tool 42, machining is performed in the axial direction of the tool 44 by coordinate rotation.
On the other hand, in the coordinate rotation according to the present invention, the tool is rotated by the rotation angle c1 in the axial direction of the tool 44, and machining is performed in the axial direction of the tool 45.

Therefore, the work surface of the work and the tool axis are different depending on whether the work is properly attached like the work 41 or the work 43 is attached at a certain rotation angle c1 with respect to the machine coordinates. The angles formed are the same, and a desired processed shape can be obtained.

FIG. 5 is a flow chart showing the processing procedure of the present invention. Note that this flow chart is based on the RO of FIG.
The system program stored in M12 is processed by the processor 1
1. Rotation axis correction means 3 realized by execution of 1
Is a processing procedure of. In the figure, the number following S indicates a step number. [S51] It is determined whether the command is a coordinate rotation command. For example, G
It is determined whether the function (G68) is included in the block. If the coordinate rotation command (YES), step S
If not (NO), the process proceeds to step S53.
Proceed to. [S52] The offset amount is set. Specifically, a numerical value following the rotation command function (R) is set as an offset amount in a predetermined storage area such as the RAM 13 in FIG. [S53] It is determined whether the command is a coordinate rotation cancel command.
For example, it is determined whether the G function (G69) is included in the block. If the coordinate rotation cancel command (YE
If S), the process proceeds to step S54, otherwise (NO)
If so, the process proceeds to step S55. [S54] The offset amount is initialized. In particular,
The offset amount is set to zero and set in a predetermined storage area as in step S52. [S55] Coordinate rotation is added. That is, while using the offset amount set in the predetermined storage area in steps S52 and S54 as the rotation angle, the rotated position coordinates are calculated using a rotation matrix or the like, and the offset amount is used as the rotation axis such as the C-axis command. Output as a command.

Therefore, the coordinate rotation command and the coordinate rotation cancel command are processed according to the above processing procedure, for example, M
Function or other NC function such as T function is added to the preprocessing means 2 of FIG.
Since the processing is performed by (1), even if another NC function is specified in the block including the coordinate rotation command or the coordinate rotation cancel command, it is surely executed.

In the above description, the present invention is applied to the interactive numerical control device, but the present invention can be similarly applied to other numerical control devices equipped with a machine tool having an axis rotation function.
Further, the rotation axis correction means 3 is configured to output the rotation axis command corresponding to the one-axis or two-axis coordinate rotation command, but is configured to output the rotation axis command corresponding to the three-axis coordinate rotation command. You can also

[0035]

As described above, according to the present invention, the block including the coordinate rotation command of the machining program detected by the preprocessing means is determined by the rotation axis correction means to obtain the rotation position coordinates and the rotation angle, and the coordinate rotation command is issued. Since the correction and pulse distribution means distributes the pulse to the servo motor based on this rotation axis command, the rotation axis is automatically corrected by the coordinate rotation command described in the machining program to control the servo motor. can do.

Therefore, the angle formed between the machined surface of the work and the tool axis is the same when the work is mounted correctly and when it is mounted at a certain rotation angle with respect to the machine coordinates, and the desired machining is achieved. The shape can be obtained. In addition, it is not necessary to create a separate macro, and it is possible to shorten the creation time of the machining program.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing a configuration of an interactive numerical control device.

FIG. 3 is a diagram showing an example of a machining program,
(A) shows a uniaxial coordinate rotation command, and (B) shows a biaxial coordinate rotation command.

FIG. 4 is a diagram showing coordinate rotation on an XY axis plane.

FIG. 5 is a flowchart showing a processing procedure of the present invention.

[Explanation of symbols]

 11, 31 Processor 12, 32 ROM 13, 33 RAM 14, 34 Non-volatile memory 18 Axis control circuit 19 Servo amplifier 23 Software key 27 Servo motor

Claims (2)

[Claims] 1. A numerical control device for controlling a servomotor by correcting a rotation axis based on a command of a machining program, reads a machining program and analyzes the block to detect a block including a coordinate rotation command, and then a rotary axis command. A pre-processing unit for outputting the rotation position coordinate and the rotation angle from a block including the coordinate rotation command, and a rotation axis correction unit for correcting the coordinate rotation command to obtain the rotation axis command; And a pulse distributing means for distributing a pulse to be output to a servo motor based on the above. 2. The numerical controller according to claim 1, wherein the rotation axis correction means is configured to correct at least one rotation axis.