| 摘要 |
PURPOSE:To produce the compound roll for steel bar rolling having excellent rolling efficiency by forming the compound structure of the outer layer material for caliber groove forming having different depth and core material, in case of producing the compound rolling roll for steel bar production having plural caliber grooves on the surface. CONSTITUTION:A cylindrical sleeve 4 is inserted to the inner face of the mold 3 for centrifugal casting and sandmold 5, 5' are inserted to the upper and lower thereof. The outer layer part 7 of which the thickness of the lower part is thicker than that of the upper part is solidified with casting by pouring the molten metal for forming the outer layer of high hardness of an adamite, etc., from a gate 6 with turning this mold at high speed. In succession the compound rolling roll is subjected to a centrifugal casting by solidifying by pouring the molten metal for the tough core part of a graphite steel, etc. The caliber groove K1-K7 having different depth for forming steel bar is formed on the outer layer 1. The caliber is made to make the <=1/2-1/3 deeper and the balance in sharrow groove, and the sharrow groove secures the outer layer thickness upto the abolishing diameter to satisfy the necessity of the deeper groove as the groove bottom part and core part. |
