Copper Bronze Brass Sheet Strip Cold Rolling Mills

Copper (Bronze, Brass) Strip Rolling Process:

• From hot rolling and cold rolling, hot rolling from billet down to around 17mm thickness by 2hi mill
• the copper cold rolling mill will be first rough rolling mill to get around 3mm sheet by 4hi roughing mill
• from 3mm go to around 1mm thickness by 4hi reverse mill
• then fine rolling mill makes copper strip and even copper foils by 4hi or 6hi hydraulic AGC reversible mill.

Copper strip Reversible Cold rolling Mill can be 4-Hi or 6-Hi to realize rough rolling, fine rolling and foil rolling copper strips.

Take 16mm input reducing down to 1.5mm as example:
16mm-10mm-7mm-5mm-4mm-3.6mm(annealing)
4mm-2.4mm-1.7mm-1.5mm, total 8passes rolling

4Hi Hydraulic Reversible Cold Rolling Mill Specification

Coil strip grade:
Copper (C110/C120/C122/C144),
Yellow Brass (C260/C268/C272),
Red Brass (C230/C220/C210)
Bronzes (C510/C511/C519/C521/C524).

Input coil strip: 12～16×250～400mm
Output coils: 0.8～1.5×250～400mm

Thickness reduction per pass: Max 40%δ
Average thickness reduction per pass: 30%
Total thickness reduction per rolling after once annealing:≤90-95%δ
Thickness reduction to interim annealing: ~75%
Tension control precision: ≤5‰, thickness control precision: ≤土0.005mm

Copper Coils:
Max outer diameter:1200 mm
Inner diameter:raw material coils:500mm  recoiling ID:508 mm
Max coil weight:3t

Max rolling force:2500 KN
Rolling torque:30 KN.m
Rolling speed:max 200 m/min
Recoiling speed:max 220 m/min
Recoiling force:30 KN
 

Copper(bronze, Brass) and copper alloy Strip plates are widely used in industries of electronics, automobiles, electricity, home appliances, etc.to make parts like electric elements, light holder, battery cap, buttons, seals, li-ion battery, etc.

Hydraulic AGC press down system to press copper thickness down to min. 0.03mm, high precision high precision reaction of the hydraulic AGC automatic control system plays critical role:

Composed of 2 hydraulic cylinders for press-down, servo hydraulic system, PLC system, thickness gauge, industrial computer, etc. The PC also shows the drivers PLC parameters for operation and saving.

Functions:

①　Manually press-down or come up

②　Roller gap position control

③　Monitor closed control

④　Pre-feedback closed control

⑤　Pressure closed loop control

⑥　Two hydraulic cylinders in synchronization

⑦　Two hydraulic cylinders in inclination control

⑧　Roller gap zero control

⑨　Mill rigidity measuring control

⑩　Nonlinear compensation control of Servo valve flow and press-down margin control of hydraulic cylinder press-down. 

⑪　Acceleration, deceleration compensation control加,

⑫　Roller gap and thickness manually adjust

⑬　Overload protection control of pressure and pressure difference.

⑭　Overload protection control of Roller gap difference overrun

⑮　Fast open/close control