Direct numerical control (DNC) system including one high-speed d

Details Direct numerical control (DNC) system including one high-speed d Direct numerical control (DNC) system including one high-speed d

1993-07-22

1995-02-07

Ruggiero, Joseph

Boots, shoes, and leggings

364132, G05F 1546, G05B 19417

Patent

active

053880510

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a DNC (Direct Numerical Control) system, and in particular, to improvement of a DNC system for die machining.
2. Description of the Related Art
There is a known DNC system having the structure in which a plurality of NC machine tools are connected to one host computer, and NC data is directly transmitted from the host computer to the NC machine tools. Such a system is often applied in performing a complicated diesinking operation requiring mass NC data, or other operations.
However, in the conventional DNC system, a LAN (Local Area Network) system has been directly connected between the host computer and the NC machine tools. For this reason, it is necessary for the host computer to execute all the processings such as converting different-format data (setup or housekeeping data) required for changing a setup into NC data, transmitting the converted setup data and NC data for machining, or the like. Particularly, during the complicated diesinking operation, excessive load is put on the host computer, as a consequence, there tends to be an interference in the data transmission to the NC machine tools. Further, If the NC machine tools perform part of the process to be executed by the host computer, for example, a process for converting different format data for changing the setup into NC data, load on the side of the NC machine tool increases, which causes the processing speed to drop. For this reason, sometimes there is the need of restricting the data transmission from the host computer to the NC machine tools.


SUMMARY OF THE INVENTION

An object of the present invention is to provide a DNC system which is capable of solving the problems raised in the prior art described above, and of efficiently operating each unit at a high speed without causing excessive load on NC machine tools and the host computer.
To achieve the above object the present invention provides a DNC system which controls a plurality of NC machine tools connected to one host computer, including a high-speed data processing unit for each of the plurality of the NC machine tools so that command information transmitted from the host computer can be distributed to each of the NC machine tools through each of the high-speed data processing units.
Preferably, each of the high-speed data processing units converts the data which is not of NC data format out of the command information transmitted from the host computer into NC data, and inputs the converted data to the corresponding NC unit of the NC machine tools.
Preferably, one of the NC machine tools is specified for and transmitting the data required for changing the setup for machining to the high-speed data processing unit corresponding to the specified NC machine tool by using data input means connected to the host computer, and the NC data for machining read out of memory of the host computer is transmitted by the data input means. On the other hand, the high-speed processing unit determines whether the data transmitted from the host computer is data required for changing a setup or machining data. If the data is one required for changing a setup, the processing unit converts the data into NC data for a numerical control, and transmits the converted NC data to the NC unit of NC machine tool corresponding to the high-speed data processing unit. If the transmitted data is machining data composed of NC data, the processing unit transmits it to the NC unit as it is.
Preferably, one of the NC machine tools is specified, and only machining data for one process and data for the next process required for changing a setup in operation schedule of the specified NC machine tool are set, thereby transmitting these data to the high-speed data processing unit corresponding to the specified NC machine tool and storing them therein. On the other hand, when the high-speed data processing unit receives the machining data for one process and data required for changing the setup for next process, the processing unit conv

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patent: 4514814 (1985-04-01), Evans
patent: 4580207 (1986-04-01), Arai et al.
patent: 4698766 (1987-10-01), Entwistle et al.
patent: 4901218 (1990-02-01), Cornell
patent: 4998206 (1991-03-01), Jones et al.
patent: 5291416 (1994-03-01), Hutchins

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