Slit rolling for bar production May30

Slit rolling for bar production...

Slit rolling for bar production In merchant bar mills with conventional rolling, rounds and rebars (both of them commonly known as bars) are produced from billets which are rolled in a sequence of passes through a multi stand rolling mill. Each of the stands is having a set of two rolls, grooved on the circumference to give together a desired pass shape. Cross section of the billet is gradually reduced and shaped in a sequence of passes till the final shape and cross sectional size is obtained. While rolling bars in a merchant bar mill, the productivity of smaller diameter bars is generally lower than the bigger diameter bars. To improve such productivity, one of the most significant developments in the area of bars production in recent years is the slit rolling. This method of rolling bars is also called “Multi Slit Rolling (MSR)”. The process of slit rolling is to roll two or more bars simultaneously from a single billet. When compared with the conventional single strand continuous rolling, MSR has reduced number of passes. The multi slit rolling technology use a combination of special roll pass design and designated guide equipment to prepare, shape and longitudinally separate the incoming billet into two or more individual strands for further rolling into the finished size. The bar is slit by rolls without any other special slitting devices. The numbers of slits can be selected by the appropriate design of the roll grooves. A bar can be separately split into two, three or four pieces in one pass. By selecting the number of slits according to the product size, the same productivity of all the products can be achieved in the bar mill. The slitting is done by applying axial force which is done by using special pass...