JP2687119B2 - 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),
Further, the data input / output unit (54) and the signal input / output unit (56)
Are connected to each other. 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 a machining program to / from an external program input / output device (not shown), and the signal input / output unit (56) is
It 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). The machining program input from the data input / output unit (54) is stored in the data area (60A), and the control data input from the signal input / output unit (56) is stored in the program area (60B). Has become. 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. A machining program and control data necessary for performing machining control are input from an external device by a data input / output unit (54) and a signal input / output unit (56). The machining program and the control data are stored in the data area (60A) and the program area (60B) of the storage section (60) by the control section (50). Next, the control unit (50) sets the program area storage unit (60
Control data stored in B) and data area storage (60
The calculation unit (58) performs the above-mentioned calculations such as the interpolation from the machining program stored in A), and issues a necessary drive command to the drive unit (62). As a result, the servo motor group (6
4) is driven and the required processing is executed according to the input data. As described above, the servo motors (64A), the servo motors (64B), and the servo motors (64
C) is not driven independently, but is driven as a whole 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 stored in the machining program and the program area (60B) stored in the data area (60A) of the storage unit (60). The servo motor (64A), the servo motor (64B), and the servo motor (64C) that are operated by the controlled data and are connected to the drive unit (62) cannot be independently driven. For example, a servo motor (64A) is used to move a drill on a drilling machine, and a servo motor (64B) and a servo motor (6
4C) 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. The present invention has been made in view of the above point, and an object of the present invention is to provide a numerical control device that can numerically control a plurality of machines efficiently and is advantageous in cost. [Means for Solving Problems] According to the present invention, an arithmetic unit performs necessary arithmetic operations 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 for inputting / outputting machining data and a machining program, and a plurality of control data input / output units each independently A signal input / output unit, a plurality of drive units capable of independently driving a control target, and a plurality of different control programs that are independently executable are provided in a single numerical controller, and the plurality of control programs are provided. The signal input / output unit, the plurality of drive units, and the plurality of control programs are arbitrarily combined to form a system control unit that forms a system of an arbitrary number of axes. The control is performed based on the control program and the machining program for each number of systems. [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 control program refers to a program for analyzing and executing a machining program, for example, a program written in a computer language such as C language, assembler language, or the like in a form executable on a CPU. It is a thing. The machining program is a program for machining the workpiece, and is described in the so-called NC programming language. Here, the control unit performs control based on a control program for each system divided into groups and a machining program specified for each system, and outputs a control command necessary for the drive unit for driving the controlled object. At this time, the control unit can simultaneously execute the control program and the 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, control data having different input conditions, such as start-up data and stop-data, can be independently input / output and executed for each control program executed as a task. Therefore, compared to a numerical controller equipped with time-sharing control, which can only execute multiple control programs of the same specifications by time-sharing and input data of different conditions, it simultaneously executes different control programs of multiple systems. can do. 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 of different input conditions, such as start-up data and stop data, can be independently controlled for each system by the control program, and the drive units of each system can be independently controlled. 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 inputs / outputs machining data and machining programs. 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). This signal input / output device (16) has a signal input / output unit (16) capable of independently inputting / outputting control data.
A), (16B) and (16C). That is, each of the signal input / output units (16A), (16B) and (16C) has the same function as the signal input / output unit (56) in 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 control programs stored in the program area (60A) of FIG. 2 and can be executed independently. Here, the control program is a program for analyzing and executing a machining program, for example, a program written in a computer language such as C language or assembler language, or a format executable on a CPU. It is a thing. Further, 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 processing data and processing programs, but additionally stores system control means. 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 system control means stored in the data area (20D) will be described. Execution of this means
It is performed by the control unit (12). As shown in FIG. 3, first, a machining program input from the data input / output unit (14), control data input from the signal input / output unit (16), and a machining program stored in the data area (20D) are stored. The control program stored in the program areas (20A) to (20C) is referred to determine which control program is to be operated (see steps SA, SB, and SC). Next, the correspondence between the control program to be operated and the signal input / output units (16A) to (16C) for inputting / outputting control data used therein is determined (see step SD). Further, the correspondence between the control program and the drive units (22) to (26) to be operated is determined (see step SE). In this way, the system control means operates the signal input / output units (16A) to (16C), the program areas (20A) to (20C), and the drive units (22) to (26) according to the content of the required control operation. It has the function of systematizing and grouping. 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 D34 is input / output ((A) in the figure), and control data D36 of the machine (36) is input / output (16B) in the signal input / output section (16B). In 16C), the control data D38 of the machine (38) is input / output ((C) in the figure). The control programs for the machines (34) to (38) are stored in the program areas (20A) to (20C), respectively. In this case, the signal input / output unit (16A), the program area (20A), and the drive unit (22) are systematized by the system control means of the data area (20D) described above (FIG. (A)). ), The signal input / output unit (16B), the program area (20B), and the drive unit (24) are systematized (FIG. (B)), the signal input / output unit (16C), and the program area (20C). And the drive unit (26) are systematized ((C) in the figure). The servomotors (28) to (32) are independently controlled based on the control programs stored in the program areas (20A) to (20C). That is, a start operation, a stop operation, and the like are performed independently. At this time, task control is performed in the control section (12). That is,
In the control section (12), the program area (20A), (20A)
B), different control programs stored in (20C) are executed under different input conditions for each organized axis, that is, when each axis is in the start state or in the stop state. It Moreover, the control programs to be executed are executed simultaneously and each axis is in an independent state. Specifically, the one based on the control program stored in the program area (20A), the one based on the control program stored in the program area (20B), and the control program stored in the program area (20C) What is based is carried out independently. 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, a case where the machine (40) having two servomotors and the machine (42) having one servomotor are controlled independently will be described with reference to FIG. In FIG. 5, the signal input / output unit (16A)
The control data D40 is input to and output from the machine (42) in the signal input / output unit (16C) (FIG. 2B). )), The program area (20A), the machine (40)
It is assumed that a control program for operating the machine (42) is stored in the program area (20C). 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).
, The program area (20A), the drive units (22) and (2
4) and are systematized (Fig. (A)), and the signal input / output unit (1
6C), the program area (20C), and the drive unit (26) are systematized (FIG. 6B). The machine (40) is controlled by the control program stored in the program area (20A), and the machine (42) is controlled by the control program stored in the program area (20C). Since the two servo motors (28) and (30) are the targets in the control of the machine (40), the calculation unit (18) performs interpolation calculation. As described above, in this example, the whole operates as two independent numerical control devices. Next, still another operation mode 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, the signal input / output unit (16B) for inputting / outputting the control data D44, the program area (20A) storing the control program, and the driving units (22) to (26).
And are systematized. In this example, the same one-system control as in the apparatus shown in FIG. 2 is performed. 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 provided in a single numerical control device, a plurality of drive units, and a plurality of different units. To configure a system with an arbitrary number of axes by arbitrarily combining with a control program, the control unit executes task control based on the control program and machining program for each system with 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 program input / output device, (18) is a calculation unit, (20) is a storage unit, (20A),
(20B) and (20C) are program areas, (20D) are data areas, (22), (24) and (26) are drive units, (28),
(30) and (32) are servomotors. 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, 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 drive unit to be controlled. 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 possible driving units, and a plurality of different control programs that can be executed independently of each other are provided in one numerical control device, the plurality of signal input / output units, the plurality of driving units, System control means for forming a system of an arbitrary number of axes by arbitrarily combining the plurality of control programs, the control unit, the control program and the machining for each system of the arbitrary number of axes Numerical controller and performs control based on the program. 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.