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J

anuary

2011

93

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:

OD:163.2, WT: 5mm, mandrel diameter: 153.2mm

OD:164.1, WT:6mm, mandrel

diameter:152.1mm

The wall thickness sampling behind extractor:

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%

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:

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%

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%

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.