I. Summary

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The mill is intended for manufacturing of round pipe of Φ32mm-Φ89mm with thickness of 1.5mm–4.5mm 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→→

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:

1. Round Pipe: 32-80mm

Pipe Thickness: 1.5 – 4.5mm

2. Square & Rectangle Pipe: 25X25mm –70X70mm

Pipe Thickness: 1.5 – 4.0mm

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: 470-510mm

Outer diameter: max=1500mm

Strip steel width: 100mm-280mm

Strip steel thickness: 1.5mm-4.5mm

The maximum weight: 4.0 tons

c) Electric installed capacity: appro. 600KW

d) Size of the whole line: appro. 70X6m

e) Line Speed: 20-70m/min

IV . Forming & sizing section

4.1 Forming mill gearbox, universal joint

4.1.1 Mill entry flattener by up-horizontal roll and below-horizontal roll, one positive five-roll flattener, one pair of feeding vertical roll.

4.1.2 Forming mill consists of:

- Driven stand: 7 sets (Horizontal)

- Driven stand shaft: Φ 90mm

- Material of shaft: 40Cr

- Side roll stand: 8 sets(Vertical)

- Side roll stand shaft: Φ50mm

- Material of shaft: 40Cr

- Gear box & universal joint: 7sets

- Material of gear box: cast steel

- Material of gear: 20CrMnTi

- Main motor: 90kW Model: Z4-225-31 1 set

- Main redactor: 1 set

- Horizontal roller frame with worm gear & shaft. adjust up and down at same time and level.

4.2 Sizing mill gear box, universal joint

4.2.1 Sizing mill consist of:

- Driven stand: 5 sets (Horizontal)

- Driven stand shaft: Φ 90mm

- Material of shaft: 40Cr

- Side roll stand: 5 sets (Vertical)

- Side roll stand shaft: Φ50mm

- Material of shaft: 40Cr

- Gear box & universal joint: 5 sets

- Material of gear box: cast steel

- Material of gear: 20CrMnTi

- Main motor: 75kW Model: Z4-225-11 1 set

- Main redactor: 1 set

- 4 sets single head Turk’s head, with 4 rollers*4sets

- One speed testing roller with air cylinder for CNC flying saw

- Horizontal roller frame with worm gear & shaft. adjust up and down at same time and level.