| Hydraulic press is one of the most universal equipments in the production of molding. To satisfy the market demands, hydraulic press gradually moves towards intellectualization and networking. At present, studies on the intelligent and networked control system of hydraulic press have been actively done and already have some successful applications. However, with reference to previous work, some problems are exposed. One is the intellectualization of control system is at low level lacking functions of fault diagnosis or maintenance, the other is system have no networking capabilities, most of them are still at stand-alone state. In this paper, 16000KN hydraulic deep drawing press was considered as a research subject, a control system integrated with intellectualization and networking was designed and exploited. The main contents are as follows:(1) According to the functional requirements, the general design of the control system was proposed and its composition structure and networked architecture were discussed. The two subsystems, the intelligent control system and the remote networked control system, were analyzed in detail with their working principle and functions.(2) Through researches on the key technologies of the control system, the hardware structure of two-stage control system was designed to meet its functional requirements by using the Omron CJ1H series PLC and TPC-1260T industrial computer as the substrate control unit and host computer unit, respectively. Combining with the requirement of intelligent monitoring, the hydraulic press control system software was developed, including condition monitoring, fault diagnosis, maintenance and digital control of process parameters such as blank holder force, punching speed, slider position.(3) By analyzing possible faults in the running of hydraulic press, an intelligent fault diagnosis expert system was designed, based on fault tree (FTA) and rule reasoning.(4) By researches on the networked control system of hydraulic press, the remote fault diagnosis and maintenance system of hydraulic press was developed, with functions of remote monitoring, intelligent fault diagnosis, interactive online diagnosis, equipment maintenance, etc. A networked control system of hydraulic press was realized using Internet/Intranet technology, information technology, artificial intelligence, and automation technology. The whole system had been tested for many times and the result showed that the expected system design goals were achieved. |
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