THE INTERNAL STRETCHING TENSION IN THE IRON CASTING
Aspects of emergence of the internal stretching tension in the chugunakh depending on a form of graphite inclusions and their influence on the dimensional accuracy of casting are considered. In work on the basis of flat mathematical model it is shown that under all other equal conditions, distinction of preshrinkable expansion in castings in comparison with castings from gray cast iron can make of high-strength cast iron from 3 to 6 times and is defined by a form of graphite inclusions. The component of preshrinkable expansion and linear shrinkage will be defined by distinction of the internal stretching tension depending only on a form of graphite inclusions that it is necessary to take into consideration when determining foundry allowances of foundry equipment for the purpose of increase of dimensional accuracy.