TPT January 2011

A rticle

• Due to the variation of mandrel diameter and in the analysis of original pass-design in accordance with the variation of wall thickness, the elongation of each stand is allocated autonomatically to achieve the reasonable load distribution in the technology mathematical model software. Rolling data analysis Piercing hollow parameter:OD:195+2/-0mm, WT:16.5mm Rolling pipe parameter:

a) The first chart is the specification 114*6.35 of shell wall thickness behind extractor: absolute deviation is 0.78mm, relative deviation is ±6.14%

OD:163.2, WT: 5mm, mandrel diameter: 153.2mm OD:164.1, WT:6mm, mandrel diameter:152.1mm The wall thickness sampling behind extractor:

b) The second chart is the specification 139.7*6.2 of shell wall thickness behind SRM: absolute deviation is 0.62mm, relative deviation is ±4.98%

a) The first chart is the specification 155*5 of shell wall thickness behind extractor: Series 1 Absolute deviation is 0.32mm, relative deviation is ±3.0% Series 2 Absolute deviation is 0.28mm, relative deviation is ±2.8%

c) The third chart is the specification 73*5.51 of shell wall thickness behind SRM: max WT is 5.8mm, min WT is 5.07mm, absolute deviation is 0.67mm, relative deviation is ±6.07%

Five stands lateral roller changing type three-roll MPM unit (TRCM) • Main parameter

inlet hollow diameter: 220, 320, 400mm outlet shell diameter: 192, 293, 366mm Installed capacity: 10,200kw • Radial press down

The existing roll gap adjusting mode is a ‘lever-type roll adjusting’ so during the press down adjusting process, the roll pass centre to the rolling centre line will be deflected.

b) The second chart is the specification 155*6 of shell wall thickness behind extractor: Series 1 Absolute deviation is 0.9mm, relative deviation is ±7.5% Series 2 Absolute deviation is 0.57mm, relative deviation is ±4.75% The sampling behind SRM:

93

www.read-tpt.com

J anuary 2011

›