FIELD: plastic metal working. SUBSTANCE: method of making hollow part comprises steps of chopping blank off rod whose diameter is less than outer diameter of ready part, calibrating rod blank, annealing it and descaling, making ready part by lengthwise extrusion. Rod blank is calibrated by lateral extrusion of it from receiving cavity of die to closed die portion whose diameter is equal to outer diameter of ready part. Working volume of closed portion of die consists 1.02-1.08 of volume of calibrated blank. EFFECT: enhanced efficiency. 3 dwg
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Authors
Dates
1997-07-20—Published
1995-07-27—Filed