| 摘要 |
PURPOSE:To produce two or more pieces of steel bars simultaneously with high productivity at the current roll speed by slitting hot a rolled material to a required number of pieces with special rolls having blade performance and further rolling the slit pieces respectively with succeeding caliber rolls. CONSTITUTION:A billet having a section A is hot-rolled to a flat section B and is further incised to a guadrisected starting section C. The section C is raised 90 deg. and the width is compressed to W2>W3 to round the section roughly equal to d1-4, whereafter the material is rolled down in height from h3 to h4, h5 with pouch-shaped caliber rolls having flanges to divide the angle of incision equally to delta1=about 40 deg., delta2=about 50 deg. and omega1=omega2=about 45 deg.. The material is then slit to 4 pieces of oval g1-1, etc. having angle of inclination beta=15 deg.+ or -5 deg. to the centerline with pouch-shaped caliber rolls having flanges P in the centers and having blades of alpha=about 10 deg. angle of bite; at the same time, the slit pieces are subjected to at least 10% rolling down then to rolling respectively to h1-4, i1-4, j1-4 with caliber rolls and the steel bar products k1-4 are obtained with final rolls. |
