On the Rounding-Up Process in High-Production Internal Grinding Machines by Digital Computer Simulation

High-production internal grinding machines are required to grind workpieces, which have an initial runout and stock allowance, in very fast grinding cycles. The runout must be corrected before the stock allowance is used up. As the internal grinding wheel strikes the running-out workpiece, high local instantaneous force intensities on the wheel may develop and may cause the wheel to break down, resulting in a loss of straightness of the finished ground workpiece. By representing the grinding process mathematically, as well as the dynamic characteristics of the grinding machine, a computer program has been developed which traces the rounding-up process, revolution by revolution, and permits the selection of the optimum machine settings so as to grind with the shortest possible cycle without damage of the wheel and without incomplete rounding up of the workpiece.