ESTIMATION OF THERMAL PRESSURE ARISING AT HOT HAMMER FORGING OF FORGE INGOT

Abstract

Within the limits of the theory of flat deformation the problem for the balance equations in displacements that has allowed to define a field of thermoelastic stresses in a forge ingot of many-sided section in the course of its cooling or heating is put and decided. Tangent normal stresses in blankets are stretching and exceed an elasticity limit when difference of temperatures between an axis and an ingot side reaches the greatest value. The method of lines of sliding receives a field of the plastic stresses arising at free forging of an ingot in mixed strikers. It is received a total stress tehsor of thermoelastic pressure and plastic hammer forging pressure, showing possibility of formation of longitudinal superficial cracks. Results are enclosed to hammer forging a 7-ton ingot of 8-faced section from the alloyed steel at temperatures 1100, 850 and 680 °C.