METHOD OF MAKING THREADED STEPPED TRUNK Russian patent published in 1994 - IPC

FIELD: war industry. SUBSTANCE: when a trunk is produced, an initial blank is obtained at first. Then its thermal and mechanical treatment for the radial squeezing are exercised. When an intermediate product is made the radial squeezing is carried out with the variable degree of deformation till the final dimensions are obtained at the maximum possible length with the curvilinear generatrix of the outer surface of the stepped trunk. The deformation degree on different parts of the blank must satisfy the definite conditions. After the intermediate product is made, the final mechanical treatment is carried out. The method is used for making machine-guns. EFFECT: facilitated manufacture. 3 dwg