500mm Nash 4-Hi Reversing Cold Mill: RM-445

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Roxboro, NC

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Description

Manufacture:
- Nash / New 1976
- Fully revamped 2012 (new electric system & drive system)

Mill Type: 4-Hi Reversing Cold Rolling Mill

Material: High-carbon steel, stainless steel, copper alloys, etc.

Strip Width:
- 500mm max (20")

Strip Thickness:
- 7.0mm max entry down to 0.3mm min exit (.276" - .012")

Line Speed:
- 300 mpm (984 fpm)
- 15 mpm threading speed (49 fpm)

Coil Size:
- OD max - 1750mm (69")
- Weight - 6 mtons (13,200 lbs)

Rolling force:
- 500 tons hydraulic servo cylinder push down type

Equipment:
UNCOILER
- Mandrel type
- 1 x 75 kW, 500 V DC, 500/1500 rpm, 440V
- Coil car, gearbox

MILL
- Work rolls - 635mm face x 175mm diameter
- Backup rolls - 610mm face x 524mm diameter
- In-foundation roll change sled
- Gauge Control:
1. New AGC & Isotope AM241 1Ci (Gamma ray) thickness gauge (new 2012)
2. AGC FB, FF and mass flow
- Roll Bending:
1. Positive and negative function with PQ valve (Moog GmbH)
- Motor/Drive:
1. New ABB DC motor drive system – 2012 – DCS800-S2
2. 2 x 450 kW, 500 V DC, 500/1000 rpm
- Cooling water: max 2 kg/cm2, (max.32 C degree)
- Air: max 5 kg/cm2
- Pinion Stand
- Gearbox
- 2 Universal joints
- Roll force hydraulic unit
- Normal hydraulic unit
- Roll coolant tank (clean/dirty): 13 m³ each / pumps / temperature control unit
- Filter - Hoffman type unit / Oil mist system / Emulsion type filter (paper type filter without precoat)

RECOILER
- 2 mandrel type units
- 2 coil cars
- Motor - DC 500 V, 300 kW, 440V

ELECTRICS
- Manufacturer: Mitsubishi Melsec
- Type: Q3 PLC system - HMI - SPC (Statistical Process Control)

2012 Revamping Notes:
- 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 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, pump unit (coolant), oil mist, drawing and manuals

Specifications

ManufacturerNash
Year1976
ConditionUsed
Stock NumberRM-445