Efficient rolling of a wide range of materials and gauges

In late 2012, Ningbo Xingye Copper contracted SMS group to supply two RCM for copper and copper alloys. Specifically, our customer ordered one 4-high roughing mill and one 20-high mill. The company is a member of the Xingye Copper International Group Ltd., a leading Chinese manufacturer of top-quality copper strip and plate products. The input stock for the 4-high RCM comes from semi-continuous casting plants or a hot rolling mill. The strips, which are up to 16 mm thick, are wound into loose coils with variable inner diameters. Whatever its gauge, the strip is coiled under tension.

To handle the large strip gauge variations, the entry and exit stations consist of a combined payoff gear and payoff drum with various reel diameters. The finished strip is wound onto a payoff drum before transport to downstream processing stations.  A special feature of this stand is that the strip is fed into the closed roll gap. As a result, the mill rolls the thick, relatively short strip completely from end to end. When the strip end leaves the roll gap it is re-threaded for the reverse pass. This ensures the target gauge along the entire length. That minimizes off-gauge lengths at the strip ends for maximum material utilization.

Main technical data

Materials

Copper, brass, bronze, copper-nickel-silver alloys, copper-beryllium, copper-iron, copper-nickel-silicon-alloys 

Strip width

420 - 680 mm

Strip thickness

16.0 - 0.5 mm

Rolling speed

max. 400 m/min.

Capacity

75,000 t/year 

The ultra-thin-gauge expert

The 20-high mill is a SplitBlock design, type SB 23-26”. It can produce minimum final gauges of 0.05 millimeters. All the required gauge and flatness tolerances are ensured by effective control elements:

  • Hydraulic roll adjustment
  • Crown adjustment of the A-D axes
  • Intermediate roll shifting
  • X-Shape flatness measuring and control system X-Pact®
  • Level 2 offline model
  • Multi-Plate® filter

A practice-proven wiping system reliably removes rolling oil residues from the thin finished strip without damaging the sensitive surface. Moreover, paper winders are integrated to protect the strip surface. The 20-high mill also comes with green, resource-saving technology from SMS in the shape of a Multi-Plate® filter with top filter fineness for cleaning the rolling oil.

Main technical data

Materials

Copper, brass, bronze, copper-nickel-silver alloys, copper-beryllium, copper-iron, copper-nickel-silicon-alloys 

Strip width

400 - 660 mm

Strip thickness

2.5 - 0.05 mm

Rolling speed

max. 800 m/min.

Capacity

55,000 t/year 

SMSgroup Image
SMSgroup Image