I. Summary
The mill is intended for manufacturing of round pipe of Φ50mm-Φ114mm with thickness of 1.0mm–3.0mm from cold-rolled and hot-rolled coil strip by means of unclosed tubular blank with its subsequent welding into tube, edge heating by means of solid state high-frequency welder, longitudinal seam welding in rolls of tube welding machine, cooling, further sizing or shaping and on-stream cutting of endless tube in measured lengths.
Finished product will be of round, square or rectangular pipe.
II. The technical flow of the production line
{SteelTape}→→ Double-head un-coiler →→Strip-head Cutter and welder→→
Horizontal spiral accumulater →→Forming section(Flattening unit +Main driving unit +Forming unit +Guide unit +High frequency induction welding unit +squeeze roller)+ De-burr frame→→Zinc Pinting machine →→Cooling unit →→ Sizing unit and straightener →→Flying saw under computer-control →→ Run-out table
III. Basic conditions:
a) Steel Pipe Specification
1. Round Pipe diameter: Φ50 –Φ114mm
Pipe Thickness: 1.0 – 3.0mm
2. Square & Rectangle Pipe: 40X40mm –90X90mm
Pipe Thickness: 1.0 – 2.0mm
3. Pipe Length: 6.0m – 12.0m
4. Length Tolerance: 0-6mm
b) SteelTape Specification
1. Material: Carbon steel (δb≤500Mpa, δs≤235Mpa)
2. Steel Tape: Inner diameter: Φ470-510mm
Outer diameter: Φmax=1800mm
Strip steel width: 160mm-360mm
Strip steel thickness:1.0mm-3.0mm
The maximum weight: 4.0 tons
c) Electricity
1. Dynamic power: AC380V±10%, 3phases, 50Hz±1.0%
2. Control Power: AC220V±10%, one phase, 50 Hz ±1.0%
d) Electric installed capacity: appro.500KW
e) Cooling water
1. Reservoir for High Frequency equipment: 20m³, one set
2. Reservoir for circulating cooling water: 25m³, one set
f) Compressed air
1. Pressure: 0.4Mpa
2. Flow: 1.5m3/h
g) Production capacity
Annual output: 35,000 ton, according to the yearly working days, daily working hours and the products.
h) Staffing
Eight people in total: One for uncoiler, one for Strip-head Cutter and welder (spiral accumulator), one for Host control, one for flying saw, two for Run-out table. One is for the machine commissioning, one for electrical commissioning.
i) Line speed: 30-70m/min