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.
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