FIELD: cold upsetting automatic machine. SUBSTANCE: method involves preliminary and final forming of head. At preliminary forming stage, head is imparted the shape of truncated cone defined at two sides with secant planes. Upper end of cone is formed as circle with diameter equal to that of blank, lower end is formed as part of circle defined by two parallel chords, with space between chords being equal to 2/3 of lower end diameter. Final forming of head is provided at three positions, with loading applied to tool being uniformly distributed. During upsetting of head and gaging, length of head rectangle is increased, width is limited and spherical shape of supporting surface of head is formed. EFFECT: increased efficiency, simplified method and improved quality of bolts. 1 dwg
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