Performance Optimizing of a Sanitary Towel Production Plant Using Reliability Model

The study was conducted in a rm that manufactures sanitary pads and babies disposable towels which production is below the installed capacity as a result of high production downtime that resulted from incessant breakdown of the subsystems of the production system. The aim of the study was to reduce the production downtime signi cantly, thereby optimizing the machine time, and consequently, raising the reliability of the production system. The research work obtained machine breakdown records from the production unit and used the data to estimate the reliability of the production system to be 0.708. This showed that the production system was idle for about 30% of the total machine time, thereby incurring a huge production loss. The hazard rates of vital subsystems obtained, as well as the provision of redundancy for some subsystem as appropriate helped to determine the improved reliability of the production system to be 0.862. The study concludes that reliability model could be an e ective tool in performance optimization of a production system.Keywords: production system, downtime, reliability, maintenance, redundancy, hazard rat

Development of CNC Program for Piston Production

Development of a computer numerical control program for the machining of a piston is a work that involves the casting and machining of a piston on a computer numerical control machine tool. Aluminum scraps were collected and heated. The molten metal at 7200C was poured into a mould and allowed to cool under atmospheric conditions. A computer numerical control program was written for the turning, grooving and boring of the piston. After cooling, the piston was mounted on a Computer numerical control lathe machine and the program was used to machine the piston. Examination of the dimensional accuracy of the piston showed that the piston with Ø52.553mm had a tolerance value of ±0.004mm which falls within acceptable standard of limit for a piston. Comparison of the piston produced shows that it is of reduced price compared with what is present in the market and with shorter time of production. Keywords: Computer Numerical Control, Turning, Grooving, Borin