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4-HI REVERSING COLD ROLLING MILL

4-HI REVERSING COLD ROLLING MILL

Description:

4-HI REVERSING COLD ROLLING MILL

4-Hi reversing cold rolling mill
Mfc.: L W NASH
Type: 4-Hi reversing cold rolling mill
Built: 1976 Fully revamped in 2012 – new electric system & drive system
Material: high carbon, stainless steel, copper alloys, etc.
Input thickness: max. 7 mm
Exit thickness: min. 0.3 mm
New AGC & Isotope AM241 1Ci (Gamma ray) thickness gauge – Pauly GmbH - 2012
Rolling speed: 300 m/min.
Threading speed: 15 m/min.
Speed up/down time: 25 sec.
Coil width: max 500 mm
Coil max. diameter: 1750 mm
Coil weight: max. 6 tons
Rolling force: 500 tons hydraulic servo cylinder push down type
Back-up roll: roll face 610 mm dia. 524 mm
Work roll: roll face 635 mm dia.175 mm
Thickness measuring: Gamma-ray thickness gauge
Thickness control: AGC FB, FF and mas flow Mfc.: Pauly GmbH
Mill power: main power AC 220 V & 440 V-60 Hz, 3 Ph
Cooling water: max 2 kg/cm2, (max.32 C degree) Air: max 5 kg/cm2

Mechanical units
Mill housing: 1 lot Universal joint: 2 sets
Pinion stand: 1 unit Pay off reel: 1 unit
Tension reel with gear box: 2 units Payoff off reel gear box: 1 unit
Payoff reel coil car: 1 unit Tension reel coil car: 2 units
Roll force hydraulic unit: 1 lot Normal hydraulic unit: 1lot
Lubrication circulation unit: 1 lot Roll coolant tank (clean/dirty): Clean tank & dirty tank 13 m³ each
Pump units (roll coolant): 1 lot Temperature control unit (roll coolant): 1lot
Hoffman type Filter unit (roll coolant): 1 lot Oil mist system: 1 lot
Filter emulsion type Paper type filter without precoat
Electric control system: 1 lot Backup roll: several lots Work roll: several lots
Electric system
Mfc.: Mitsubishi Melsec Type: Q3 PLC system HMI
SPC (Statistical Process Control)
New ABB DC motor drive system – 2012 – DCS800-S2
The roll bending is positive and negative function with PQ valve (Moog GmbH).
Mill motor: DC 500 V, 450 kW, 500/1000 RPM x 2 units 440 V
Pay off reel motor: DC 500 V, 75 kW, 500/1500 RPM 440V
Tension reel motor: DC 500 V, 300 kW, 440V
Roll force hydraulic unit Normal hydraulic unit Lubrication circulation unit
Revamped in 2012:
Revamped and Reused items: housing, various backup, work rolls with chocks, payoff reel with coil feeder, tension reels, coil cars, motors, spindle and Hoffman type filter
Newly attached items: clean/dirty tank, electric control/ABB drive system, AGC/gamma ray thickness gauges, HMI, servo hydraulic system, main roll force cylinder, positive/negative bending, normal hydraulic system, shear, left/right side guides with wiper, left/right reel out board bearings.
New foundation drawing, cabling and piping.