Micro-computer control of Petro-Forge machines

Abstract

The firing cycle of Petro-Forge hammers is controlled by a solid state timer. This generates signals to initiate the sequence of valve opening/closure to fill the combustion chamber with a combustable mixture of air and fuel, the ignition of this and its exhaust. The system has proven to be highly reliable but (1) it is not able to adapt itself to changing conditions arising during the warming up stage of fast cycling machines. (2) It operates at a constant cycle time, irrespective of the size of the billet formed. (3) It is complex and hence its maintenance requires specially trained personnel. A micro-computer control system has been developed which ensures that the blow energy is kept within close limits, irrespective of the thermal state of the machine. Its cycle time increases with the blow energy. It has built-in diagnostic capabilities without requiring additional transducers/sensors beyond those needed for the normal operation of the machine. In addition, the micro-computer control system ensures an increase of the maximum blow energy by about 20%. The blow energy can be controlled from a central processor which supervises the operation of a group of machines and as well as costing and estimating, the CAD and CAM of forging dies. process planning and scheduling, etc, within a Computer Integrated Forming System (CIFS).