JP2687120B2 - Numerical control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a numerical control device,
The present invention relates to a numerical control device that controls a plurality of controlled axes. [Prior art] Numerical control devices that instruct the position of a tool with respect to a workpiece by numerical information have advantages such as improved productivity, labor saving, and thorough management, and are applied to various machine tools and widely used. Have been. FIG. 2 shows an example of a conventional numerical controller. In this figure, the control unit (50) includes a central processing unit (hereinafter referred to as "CPU") (52), and a data input / output unit (54) and a signal input / output unit (56). Each is connected. The control unit (50) further includes an arithmetic unit (58) and a storage unit (6
0) and the drive unit (62) are connected to each other, and the drive unit (6
2), a servo motor group (64) is connected. Of these, the data input / output unit (54) is for inputting / outputting processing data, particularly a processing program, to / from an external data input / output device (not shown), and the signal input / output unit (56). ) Is for inputting and outputting control data such as start and stop. Next, the storage section (60) is provided with a data area (60A) and a program area (60B). Other machining data of the machining program input from the data input / output unit is stored in the data area (60A), and control data input from the signal input / output unit (56) is stored in the program area (60B). It is like this. Next, the calculation unit (58) performs a calculation necessary for controlling the servo motor group (64). For example, when a drive command is given at a vector speed, a predetermined speed is calculated from the decomposition speed in the coordinate axis direction. Calculation processing such as interpolation for obtaining the moving distance of time is performed. Next, the drive unit (62) corresponds to the fact that the servo motor group (64) is composed of three servo motors, a servo motor (64A), a servo motor (64B), and a servo motor (64C). And three drive circuits (62A), (62B), (62
C). Note that the servo motor group (64) actually corresponds to a servo motor of a three-axis driving portion of a machine tool such as a lathe or a drilling machine. Next, the operation of the above device will be described. Data necessary for performing processing control is input from an external device by a data input / output unit (54) and a signal input / output unit (56). These data are stored in the data area (60A) and the program area (60B) of the storage unit (60) by the control unit (50). Next, the control unit (50) sets the program area storage unit (60
Based on the programs and data stored in B), the above-mentioned interpolation and other calculations are performed by the calculation unit (58) from the programs and data stored in the data area storage unit (60A), and required for the drive unit (62). Drive command. As a result, the servo motor group (64) is driven, and required processing is executed according to the input data. As described above, the servo motors (64A), servo motors (64B), and servo motors (64C) of the servo motor group (64)
Are not driven independently, but are driven together as a whole. [Problems to be Solved by the Invention] By the way, in the conventional numerical control device as described above, the whole is operated by the control program stored in the program area (60B) of the storage unit (60), and the driving unit is operated. The servo motor (64A), servo motor (64B), and servo motor (64C) connected to (62) cannot be driven independently. For example, a servo motor (64A) is used to rotate a drill on a drilling machine, and a servo motor (64B)
C) cannot be used for lathes. Therefore, it is necessary to provide a numerical controller as shown in FIG. 2 for each machine. Therefore, when numerical control of many machines is performed, a large amount of equipment is required, which is disadvantageous in terms of cost. Further, the content of the machining is determined by the content of the machining program prepared in advance, and there is an inconvenience that the content cannot be easily changed. The present invention has been made in view of the above points, and is capable of efficiently numerically controlling a plurality of machines, freely selecting various processing contents, and performing each of these processings on each machine. It is an object of the present invention to provide a numerical control device which is advantageous in terms of cost. [Means for Solving Problems] According to the present invention, a calculation unit performs necessary calculations based on control data input from a signal input / output unit and a control program and a machining program stored in a storage unit. In a numerical controller that gives a control command required by a control unit to a drive unit to be controlled, a data input / output unit that inputs / outputs machining data and a machining program, and a plurality of data input / output units that can independently input / output control data. A signal input / output unit, a plurality of driving units capable of independently driving a control target, a plurality of different control programs each independently executable, and a predetermined work number are arbitrarily selected and independently controlled. At least one machining program that can be executed by a single numerical controller is provided, and the plurality of signal input / output units, the plurality of driving units, and the plurality of control programs are provided. System control means for forming a system with an arbitrary number of axes by arbitrarily combining a system and a common designation for specifying that the selected machining program can be commonly executed by a system with an arbitrary number of axes combined arbitrarily. Means is provided, and the control unit performs control based on the control program and the machining program for each system of the arbitrary number of axes. [Operation] In the present invention, a single numerical control device is provided with a plurality of signal input / output units, drive units, and control programs, and these units are grouped into a system having an arbitrary number of axes by the system control means. Be divided. The control programs are different programs for each grouped system. Here, the machining program is a program for machining the workpiece, and is described in the so-called NC programming language. Further, the control program means a program for analyzing and executing the machining program, for example, a program written in a computer language such as C language or assembler language, or a program executable on a CPU. Is. Here, the control unit performs control based on a control program for each system divided into groups and the same machining program specified for each system, and controls required for the drive unit for driving the controlled object. Although a command is given, at this time, the control unit can simultaneously execute programs for each system (control program and machining program for each system). Therefore, the control unit executes different control programs under different input conditions, and so-called task control is executed. For example, when the system control means divides the system into a first system of two axes and a second system of three axes, the control program for the first system of the specification that controls the two axes at the same time and the system of the three systems at the same time. A control program for the second system having a specification different from that of the control program for the first system to be controlled is executed and controlled as different tasks. Then, for each control program executed as a task, control data of different input conditions,
For example, start-up data, stop-data, etc. can be independently input / output and executed. Therefore, as compared with a numerical control device equipped with time-divisional control, which is capable of performing time-division of a plurality of control programs of the same specification and inputting data of different conditions and executing the data, it simultaneously executes different control programs of a plurality of systems. be able to. Therefore, control with different specifications is performed for each system having an arbitrary number of axes configured for each group. In addition, since the plurality of signal input / output units can independently input / output control data, even when one driving unit sequentially requires a plurality of control data, the group of signals can be controlled during the control of the driving unit. The control data can be sequentially input / output independently for each of the divided systems, and the control data of the drive units in the other systems will not be input. For this reason,
Control data with different input conditions, such as start data and stop data, can be input independently for each system,
It is possible to control the drive unit of each system independently. Further, a machining program arbitrarily selected by a predetermined work number is designated by the common designation means to be commonly executed by each system divided into the groups. For example, a predetermined work number is selectively stored in advance in the storage unit with respect to the machining program stored in the storage unit, and the common designating means designates a required work number to select an arbitrary machining program. Can be configured to. In this case, the same machining program can be selected in a plurality of systems by designating a common work number by the common designating means. That is, when each of a plurality of independently operating systems processes the same work, a plurality of machining programs stored in the storage unit and a work number corresponding to each machining program are processed by the common control means. By designating an arbitrary work number so as to be specified by the system, the same machining program is selected and executed for each system. The calculation unit performs an interpolation calculation between the control targets combined with the system by the system control unit. That is, the calculation unit performs interpolation calculation between control targets in an arbitrary group. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a numerical controller according to the present invention. In the figure, a data input / output unit (14) is connected to a control unit (12) including a CPU (10). The data input / output unit (14) corresponds to the data input / output unit (54) in FIG. 2 and exchanges a machining program and other machining data with an external data input / output device (not shown). is there. Here, the machining program to be input is a program for machining a workpiece, and is described in a so-called NC programming language. Next, a signal input / output device (16) is connected to the control unit (12). The signal input / output device (16) is composed of signal input / output units (16A), (16B), and (16C) capable of independently inputting / outputting control data.
That is, the signal input / output section (16A), (16B), (16C)
Have the same function as the signal input / output unit (56) of FIG. Next, an arithmetic unit (18) is connected to the control unit (12). The calculation unit (18) performs the above-described interpolation and other calculations. Next, the storage unit (20) is connected to the control unit (12). This storage section (20) has a program area (20
A), (20B) and (20C). These program areas (20A), (20B), (20C) store control programs that are different from each other and can operate independently. That is, the program area (20A), (20
The control programs stored in B) and (20C) have the same functions as the programs stored in the program area (60B) of FIG. 2 and can be executed independently. Here, the control program is a program for analyzing and executing the machining program, for example,
It is written in a computer language such as C language or assembler language, or is a format executable on a CPU. Next, the storage section (20) is provided with a data area (20D). Similar to the data area (60A) of FIG. 2, this data area (20D) stores machining data and machining programs, but in addition, the system control means is programmed and stored. Next, the storage area (20) has a program area (20E).
Is provided. This program area (20E)
It is for storing the input machining program together with a predetermined work number for calling. At least one machining program is stored in the plural program area (20E) if necessary. Furthermore, the storage area (20) has a program area (20F)
Is provided. In this program area (20F), select any machining program stored in the program area (20E), and execute any work stored in the program area (20E) so that it can be executed in common in each control program. Common designation means for designating a number is programmed. Next, the control unit (12) includes the drive units (22), (24),
(26) are connected to each other. These drives (22),
(24) and (26) can operate independently, and the second
Each has the same function as that of the driving section (62) in the figure. However, only one axis can be controlled. Next, servo motors (28), (30), and (32) are connected to the driving units (22), (24), and (26), respectively. The servomotors (28), (30), and (32) are not necessarily of the same machine, but may be of two or more machines, and can operate independently. Next, the common designating means stored in the above data area (20D) will be described. As shown in FIG. 3, first, refer to the data input from the data input / output unit (14) and the signal input / output unit (16), and the control programs stored in the program areas (20A) to (20C). Then, which control program is to be operated is determined (see steps SA, SB and SC). Next, a control program to be operated and a signal input / output unit (16A) for inputting and outputting control data used for the control program
Or (16C) is determined (see step SD). Further, the correspondence between the control program and the drive units (22) to (26) to be operated is determined (step SE).
reference). Next, a machining program corresponding to the machining to be executed is selected (see step SF). Then, the common designation means commonly designates the work numbers stored in the program area (20E) so that the selected machining programs are commonly executed (see step SG). In this way, the system control means operates the signal input / output sections (16A) to (16C), the program areas (20A) to (20C), and the drive sections (22) to (26) according to the content of the required control operation. The system has a systematic grouping function, and the common designating means has a function of designating that the selected machining programs are commonly executed in each group. Next, the overall operation of the above embodiment will be described by taking various cases as examples. First, referring to FIG. 4, a one-axis machine (34),
A case where (36) and (38) are controlled independently will be described. In the signal input / output section (16A), the machine (34)
Control data D (34) is input / output, and the signal input / output unit (16
In B), the control data D (36) of the machine (36) is input / output, and the control data D (38) of the machine (38) is input / output in the signal input / output unit (16C). Further, it is assumed that the control programs for the machines (34) to (38) are stored in the program areas (20A) to (20C), respectively, and the machine areas (34) to (3) are stored in the program area (20E).
It is assumed that the machining programs PA or PD that can be executed in 8) are stored. In this case, the signal input / output section (16A), the program area (20A), and the drive section (22) are systematized by the above-described system control means for the data area (20D), and the signal input / output section ( 16B), a program area (20B), and a drive section (24) are systematized, and a signal input / output section (16C)
, A program area (20C) and a drive unit (26). Then, one of the machining programs PA to PD is selected from the program area (20E) and read by the control section (12) by the work number, and at the same time each machine (34), (by the common designating means of the program area (20F). 3
6) and (38) are specified to be commonly executed. The machines (34) to (38) are control data input from the signal input / output units (16A) to (16C), control programs stored in the program areas (20A) to (20C), and machining programs. Each is independently controlled based on the selected PA or PD. That is, a start operation, a stop operation, and the like are performed independently.
However, the processing content is the same for each machine. At this time,
The control section (12) performs so-called task control. In other words, in the control unit (12), different control programs (20A), (20B), (20C) and machining programs PA to PD are selected under different input conditions for each organized axis, That is, it is executed when each axis is in the activated state or in the stopped state. Moreover, the control program and the machining program to be executed are simultaneously executed, and each axis is in an independent state. Specifically, the control program (20A) and the one based on the machining program, the control program (20B) and the one based on the machining program, and the control program (20C) and the one based on the machining program are executed independently. is there. Therefore, each axis can perform an independent operation. As described above, in this example, the entire device functions as three independent numerical control devices. Next, referring to FIG. 5, the machine (40) having two servo motors and the machine (42) having one servo motor are independently controlled to execute the machining programs PE. The case will be described. In FIG. 5, the signal input / output unit (16A)
The control data D (40) is input / output to / from 0) and the signal input / output unit (16C) inputs / outputs the control data D (42) to / from the machine (42). It is assumed that the control program for operating the machine (40) is stored in, and the control program for operating the machine (42) is stored in the program area (20C). Further, it is assumed that machining programs PA to PF are stored in the program area (20E). In this case, as shown in FIG. 5, the signal input / output unit (16A) is controlled by the system control means of the data area (20D).
And the program area (20B), the drive units (22) and (2
4), and a signal input / output unit (16C), a program area (20C), and a drive unit (26) are systematized. Then, PE is selected from the machining programs PA to PF stored in the program area (20E), and the common designating means designates that. The machine (40) is controlled by the control program stored in the program area (20B) and the selected machining program PE, and the machine (42) is controlled by the control program stored in the program area (20C) and the selected machining. program
Controlled by PE. In addition, since the two servo motors are the targets in the control of the machine (40), the calculation unit (1
In 8), interpolation calculation is performed. As described above, in this example, the whole operates as two independent numerical control devices. In this example, different machining programs are executed on the machines (40) and (42), such as executing the program PB enclosed by the machine (40) and executing the machining program PD on the machine (42). May be. Next, still another operation of the present embodiment will be described with reference to FIG. The figure shows an example in which the machine (44) has three servomotors. In this case, a signal input / output unit (16B) through which control data D (44) is input / output,
The program area (20
A) and the drive units (22) to (26) are systematized.
In this example, the same one-system control as in the apparatus shown in FIG. 2 is performed. However, the machining program to be executed can be arbitrarily selected and executed from any of the programs stored in the program area (20E). Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, up to three independent systems can be constructed. However, two systems may be constructed, or more systems may be constructed. [Effects of the Invention] As described above, according to the present invention, the system control unit includes a plurality of signal input / output units, a plurality of drive units, and a plurality of drive units that are provided in one numerical controller. A machining program that is arbitrarily combined with a control program to form a system with an arbitrary number of axes, and a machining program that is arbitrarily selected by a predetermined work number is common to the system with an arbitrary number of axes that is arbitrarily combined by the common designation means. In order to execute the task control based on the control program and the machining program for each system of the arbitrary number of axes,
There is an effect that numerical control of each of the plurality of units can be efficiently performed, and cost is also advantageous.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG.
FIG. 1 is a circuit block diagram showing a conventional numerical control device, FIG. 3 is an explanatory diagram for explaining the function of a system control means, and FIGS. 4 to 6 are explanatory diagrams showing an operation mode of the embodiment of FIG. is there. In the figure, (12) is a control unit, (16) is a signal input / output device, (18) is an arithmetic unit, (20) is a storage unit, (20A), (20
B), (20C), (20E), (20F) are program areas,
(20D) is a data area, (22), (24) and (26) are drive units, and (28), (30) and (32) are servo motors. Note that the same reference numerals in each drawing indicate the same or corresponding parts.

Claims (1)

(57) [Claims] Based on the control data input from the signal input / output unit, and the control program and the machining program stored in the storage unit, the arithmetic unit performs the necessary arithmetic operation, and the control unit requires the control command for the controlled drive unit. In a numerical control device that gives the data, a data input / output unit for inputting / outputting machining data and a machining program, a plurality of signal input / output units capable of independently inputting / outputting control data, and independently driving a control target A plurality of different driving units, a plurality of mutually different control programs that can be independently executed, and at least one machining program that is arbitrarily selected by a predetermined work number and that can be independently executed. Provided in the numerical control device, the plurality of signal input / output units, the plurality of driving units, and the plurality of control programs are arbitrarily combined to form a system having an arbitrary number of axes. And a common designation means for designating that the selected machining program can be commonly executed by a system having an arbitrary number of axes, which is arbitrarily combined, and the control unit controls the arbitrary axis. A numerical controller characterized by performing control based on the control program and the machining program for each number of systems. 2. 2. The numerical control device according to claim 1, wherein the calculation unit performs an interpolation calculation between control targets combined by the system control unit.