| 摘要 |
FIELD: rolled tube production, namely piercing ingots and blanks of titanium base alloys, possibly production of conversion large- and mean-diameter tubes in tube rolling plants with pilger mills. ^ SUBSTANCE: method comprises steps of heating drilled blanks and ingots in muffles till yielding temperature; piercing them in skew rolling mill with use of short mandrel to sleeves at interim cooling of outer surface of ingots and blanks before piercing. Cooling down of ingots and blanks is realized at rotating them in air for time period t =0.45 Db where t - cooling down time period, s; Db - outer diameter of ingots and blanks, mm. Cooling down may be also realized with use of gaseous agent chemically neutral to titanium base alloys and fed onto surfaces of rotating ingots and blanks for time period t = 95xDbxC where Db - outer diameter of ingots and blanks, m; C - speed of gaseous chemically neutral agent, m/s. Revolution number of ingots and blanks is (2 - 5) rev/min. Gaseous agent is fed at speed (2 - 3) m/s. ^ EFFECT: elimination of slipping, jamming and distortions of blanks due to friction factor uniform along perimeter and length. ^ 3 cl, 1 tbl |
