An object-oriented manufacturing control system

Abstract

This paper presents the development of an event-driven control architecture and its implementation in a physical simulator of a computerized manufacturing system using object-oriented techniques. The architecture was developed to improve the efficiency of handling concurrent control events in the DOS environment. In the implementation, the control system of the physical simulator consists of four distinct layers of control devices: a PC/386 computer, a microcontroller, I/O modules and the system's control devices such as motors, solenoids and sensors. A control program residing in the PC/386 coordinates system-level tasks such as event scheduling, while a BASIC program running on the microcontroller handles all low-level control tasks such as sensor monitoring and motion control. The concepts and developments presented in this paper should help in implementing an efficient control system for both CIM systems and their physical simulators.

Machining Process Monitoring System Using Audible Energy Sound Sensors

“…With reference to machining operations, the implementation of these systems requires the supervision of different aspects related to the machine (diagnostic and performance monitoring), the tool or tooling (state of wear, lubrication, alignment), the workpiece (geometry and dimensions, surface features and roughness, tolerances, metallurgical damage), the cutting parameters (cutting speed, feed rate, depth of cut), or the process itself (chip formation, temperature, energy consumption) (Byrne, 1995;D'Errico, 1997;Tönshoff, 1988;Grabec, 1998;Inasaki, 1998;Kopac, 2001;Fu, 1996;Masory, 1991;Huang, 1998;Teti, 1995;Teti, 1999). For the monitoring and control of the above mentioned aspects, it has been necessary to make notable efforts in the development of appropriate process monitoring systems (Burke & Rangwala, 1991;Chen et al, 1994;Chen, 2000). Such systems are typically based on different types of sensors such as cutting force and torque, motor current and effective power, vibrations, acoustic emission or audible sound (Desforges, 2004;Peng, 2004;Lin, 2002;Sokolowski, 2001;Ouafi et al, 2000;Karlsson et al, 2000;Jemielniak et al, 1998;Byrne, 1995;Dornfeld, 1992;Masory, 1991).…”