JP2588953B2 - Numerical control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a numerical control device, and particularly executes a process different from a process of a programmable controller (PC).
The present invention relates to a numerical controller having an interface with an FA controller.

<Prior Art> In a numerical control device, a PC executes a predetermined sequence process based on a command from a numerical control unit, and each machine element of a machine tool operates based on the sequence process result.
The numerical control unit executes the next numerical control after the operation of the mechanical element is completed. FIG. 2 is a block diagram of such a conventional numerical controller, and 1 is a numerical controller (CN).
C), 2 is a programmable controller (PC), 3 is an NC-PC interface for controlling data exchange between the numerical controller and the PC, and 4 is a machine tool.

The NC-PC interface 3 is connected to the numerical controller and the PC via a bus, and includes a shared RAM 3a accessed by both processors and a bus arbiter 3b for switching the bus.

The PC normally performs sequence control according to a ladder program, outputs commands from the numerical control unit to the machine tool to control the machine tool, and notifies the numerical control unit of the state of the machine tool.

By the way, a numerically controlled machine tool may be connected to a host computer to build an FA system, or a numerically controlled machine tool may incorporate new functions such as adaptive control and tool breakage monitoring. In FIG. 2, 5
Denotes a host computer, 6 denotes a LAN connection adapter, and 7 and 8 denote measuring instruments and sensors for performing tool breakage control and adaptive control.

<Problem to be Solved by the Invention> In such a case, the FA is conventionally stored in a PC ladder program or the like.
It is necessary to make changes or additions to build the system, or to execute new functions, making it difficult to modify the ladder program, and there are limitations on the functions and systems that can be implemented. Was.

In addition, FA systems, tool breakage monitoring systems, adaptive control systems, etc. are often added after the machine is delivered to the user or upgraded in accordance with technological advances, and PCs that originally control machine tools It is preferable to control independently.

Accordingly, it is an object of the present invention to provide a numerical control device which does not require changing a PC program (such as a ladder program) when a new function is added, and which can easily add a new function.

<Means for Solving the Problems> FIG. 1 is a block diagram of a numerical controller according to the present invention.
1 is a numerical controller, 2 is a PC, 3 is a PC-NC interface (first interface), 11 is an FA controller (FA
C) and 12 are NC-FAC interfaces (second interfaces).

<Operation> In addition to the first interface 3 for controlling the data transfer between the numerical controller 1 and the PC 2, a second interface 12 for controlling the data transfer between the numerical controller 1 and the FA controller 11 is provided. 11 executes processing (tool damage monitoring processing, adaptive control processing, etc.) different from the processing performed by the PC, inputs the processing result to the numerical control unit 1 through the second interface 12, and the numerical control unit 1 Command tool change and optimal spindle speed based on data from FA controller.

<Embodiment> FIG. 1 is a block diagram of a system including a numerical controller according to the present invention, and the same parts as those of the conventional system of FIG.

1 is a numerical controller, 2 is a PC, 3 is a PC-NC interface (first interface), 4 is a machine tool, 5 is a host computer, 6 is a LAN connection adapter, 7 is a measuring instrument, 8
Is a sensor.

Reference numeral 11 denotes a programmable FA controller (FAC), which is different from the processing performed by the PC (tool damage monitoring processing,
That perform adaptive control processing, etc., 12
Is an NC-FAC interface (second interface) for controlling data transfer between the FA controller 11 and the numerical controller 1. The numerical controller 1 and the interfaces 3 and 12 constitute a numerical controller 10.

Although not shown, the first and second interfaces 3 and 12 are both configured to have a shared RAM and a bus arbiter, and data can be exchanged between the numerical controller 1, the PC 2, and the FA controller 11 via each interface. I can do it. In addition, the second interface 12 is a numerically controlled machine tool.
When incorporated in an FA system, it is also connected to the LAN connection adapter 6 so that each unit and adapter can exchange data with each other.

Data transmission and reception via each interface is performed by writing a command and data in the storage area of the other party in the shared RAM on the data transmitting side, and reading the command and data on the receiving side (the other party). Which unit is allowed to access the shared RAM is determined by a well-known bus control function of a bus arbiter.

The FA controller 11 is connected to each of the above interfaces, is connected to the machine tool 4, and is connected to a predetermined measuring instrument 7 or a sensor 8 as required, so that measurement data and detection data can be taken.

Hereinafter, the operation of the FA controller 11 regarding the spindle rotation speed control in the adaptive control will be described.

The FA controller 11 periodically fetches data from measuring instruments or sensors, calculates the load on the blade, and monitors whether the load is excessively overloaded.

If the overload is excessive, the FA controller 12 stores the emergency stop data in the shared RAM of the second interface 12.

Since the numerical controller 1 reads its own area of the shared RAM periodically, it reads the emergency stop data at a predetermined timing. As a result, the numerical controller immediately sends an emergency stop signal to the PC 2 via the first interface 3 and causes the PC to stop the machine tool 4 in an emergency. It should be noted that the FA controller 11 may be configured to directly stop the machine tool in an emergency manner, or the PC may read the emergency stop data set in the second interface 12 to apply an emergency stop to the machine tool. You can also.

On the other hand, if the load applied to the cutter is not excessive overload or equal to or less than the overload, the FA controller 11 determines the spindle override amount so that optimal cutting is performed, and performs the second interface operation in the same manner as described above. It is sent to the numerical controller 1 via 12.

The numerical controller 1 changes the main shaft rotation speed based on the override amount, and changes the rotation speed of a spindle motor (not shown).

In the above description, a case is shown in which the numerical controller is constituted by the numerical controller 1, the first interface 3, and the second interface 12, but the PC 2 and the FA controller 11 are incorporated in the numerical controller as appropriate, or Can be attached.

Although the data transmitted and received via the second interface 12 has not been described in detail above, for example, the following data can be considered. In other words, (i) feed speed override, override cancel, spindle speed override, (ii) cycle start, feed hold, reset, emergency stop, etc. (iii) mirror image, block delete, (iv) NC status, (v) machine side Status, (vi) scaling, coordinate rotation data, (vii) tool data table (viii) spindle motor load, speed, servo motor load, deviation, speed spindle, servo motor control limit spindle motor control signal, (ix) machining program Selection / deletion / upload / download / directory (x) Data display / transmission of data related to pallets / work fixtures / work, etc. <Effects of the Invention> According to the present invention, data exchange between the numerical control unit and the PC is controlled. Independent of the first interface And the value control unit
A second interface for data transfer between FA controllers is provided, and a numerical controller is built with an FA controller built-in or externally, so the PC program (ladder program, etc.) is changed when new functions are added. No need. New functions can be added or changed easily and in a short time by connecting an FA controller or changing its program, and the processing capacity (program size and execution time) is greatly improved. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram of a system including a numerical controller of the present invention, and FIG. 2 is a configuration diagram of a system including a conventional numerical controller. 1 Numerical control unit 2 Programmable controller (PC) 3 PC-NC interface 11 FA controller 12 NC-FAC interface

Claims (2)

(57) [Claims] 1. A numerical control device comprising a numerical controller and a first interface for performing data transfer between a programmable controller (PC) for controlling a machine tool by executing a sequence process. A numerical controller comprising: an FA controller for executing another processing and inputting the processing result to the numerical controller; and a second interface for controlling data transfer between the numerical controller and the numerical controller. 2. The numerical controller according to claim 1, wherein said FA controller is built-in.