SLEEVE PRODUCTION METHOD

• Main Authors: ROMANTSEV B.A, SEJDALIEV BREKESH, POLJAKOV K.A, SHIRJAEV V.K, FADEEV M.M, KHARITONOV E.A, GALKIN S.P, FROLOCHKIN V.V, MARCHENKO K.L, BAGAEV N.F, KUZNETSOV V.JU
• Format: Patent
• Language: English; Russian
• Published: 10.02.2005
• Edition: 7
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING

FIELD: processes for making seamless tubes, namely with use of screw rolling equipment. ^ SUBSTANCE: method comprises steps of reducing heated blank in three-roll pass formed by rolls turned by feed angle and having reduction portion; piercing blank in pass formed by mandrel, guiding tool and two rolls turned by feed angle and having piercing portions; reducing blank in three-roll pass at feed angle of rolls consisting 1.4 - 4.0, at inclination angle of generatrix of reduction portion relative to rolling axis consisting 1.3 - 5.6, and at percentage reduction value consisting 1.6 - 6.2 respectively of feed angle, inclination angle of generatrix of roll piercing portion to rolling axis and percentage reduction value before nose of mandrel during piercing process. ^ EFFECT: lowered quantity of technological waste caused by occurring of inner and outer films, improved accuracy of sleeves made by screw rolling, mainly of continuously cast billets. ^ 1 tbl, 3 ex