I. Summary
The mill is intended for manufacturing of round pipe of Φ25mm-Φ114mm with thickness of 1.2mm–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} →→ Un-coiler →→ Strip-head Cutter and welder →→
Spiral accumulator →→ Forming section(Flattening unit +Main driving unit +Forming unit +Guide unit +High frequency induction welding unit +squeeze roller) →→ De-burr frame →→ 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: Φ25-Φ114mm
Pipe Thickness: 1.2-3.0mm
2. Square pipe: 20X20-90X90mm
Rectangle Pipe: 15X25mm –60X120mm
Square Pipe Thickness: 1.2-2.0mm
3. Pipe Length: 6.0m-12.0m
4. Length Tolerance: 0-6mm
b) SteelTape Specification
1. Material: Galvanized Steel (Carbon steel) (δb≤500Mpa, δs≤235Mpa)
2. Steel Tape: Inner diameter: Φ470-Φ510mm
Outer diameter: Max.Φ1500mm
Strip steel width: 75-360mm
Strip steel thickness: 1.2-4.0mm
The maximum weight: 3.0 ton
c) Electricity
1. Dynamic power: AC400V±10%, 3phases, 60Hz±1.0%
2. Control Power: AC220V±10%, one phase, 50 Hz ±1.0%
d) Electric installed capacity: appro. 450KW
e) Cooling water
1. Reservoir for High Frequency equipment: 20 m³, one set
2. Reservoir for circulating cooling water: 15 m³, one set
f) Compressed air
1. Pressure: 0.4Mpa
2. Flow: 1.5m3/h
g) Production capacity
Annual output: 35000 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
g) Size of the whole line: appro. 60m x 7m
114mm Automatic erw pipe mill