SMS group has been a pioneer in blocks with individually driven stands and combined the market´s demand for a 4-pass wire rod block with an individually driven-stand MEERdrive® block. The result was the MEERdrive®PLUS, a 4-pass sizing block that is capable of rolling and finishing wire rod within the 4.5 millimeter to 26 millimeter range. With this wire rod sizing block, it will be possible to achieve tolerances close to 0.05 millimeters and an exceptional ovality thanks to the ORRR (oval round round round) pass sequence.
A typical application of the MEERdrive®PLUS is to install it after an 8 or10 pass traditional finishing block as featured in the Caleotto rolling mill. The technological distances and the water boxes required before and after the wire rod sizing block depend on the relevant steel grades and their end use.
All sizes are finished on the MEERdrive®PLUS, using the 8-pass block as a feeder of small sizes from 4.5 to 12.5 millimeters, and the intermediate mill for the remaining sizes up to 26 millimeters. With this solution, changing times are reduced considerably and the mill utilization time is significantly improved. If the produced mix of sizes is extended especially, a quick-changing device for changing all 4 stands simultaneously is also possible.
The inline MEERgauge® measuring system, which is based on laser light- section technology installed after the MEERdrive®PLUS can measure up to 99 % of the bar surface (depending on the speed). The system uses four sensors and has a scanning rate of up to 15,000 scans per second. A true-shape cross-section is created from up to 400 synchronous measuring points in a shared coordinate system, and is then displayed with maximum precision. Unlike with conventional systems, the true shape of the contour can be represented precisely. With no moving or oscillating parts, the system requires almost no maintenance.