Ray M. The energetics of the working stroke of crank forging press on the operations of die forging.

The thesis is dedicated to development of methods of analytical computation of power parameters of working stroke of crank forging press on the operations of die forg-ing. Mathematical models and program facilities for power computation of working stroke of crank forging press on the operations of the opened die forging, extruding and trim-ming of flash are developed. Mathematical dependences are developed for computation of losses of energy on friction at constant effort on a slide-block and at the elastic unloading of the press after transition of the slide-block through extreme lower position. The values of the resulted friction coefficient and expenditures of energy on a working stroke are ex-perimentally determined. Normality of distributing of the measured values is tested, the er-ror bounds of the experimental results are determined, the reproducibility of results of measuring is checked. Adequacy of theoretical determinations of expenditures of energy on a working stroke to experimental dataisconfirmed by the computation of the experi-mental Fisher's criteria and their comparison with tabular ones.