HF ERW PIPE MILL LINE

I. Summary

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The tube mill, pipe making machine is intended for manufacturing of round pipe of Φ89mm-Φ273mm with thickness of 4.0mm–12.0mm 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 pipe, square and rectangle pipe.

II. The technical flow of the production line

{SteelTape}→→ Double-head un-coiler→→Five-roll Flattener →→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 →→seam annealer→→

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: Φ89mm-Φ273mm

Pipe Thickness: 4.0– 12.0mm

2. Square and rectangle pipe: 70x70-200X200mm

Pipe Thickness: 4.0 – 12.0mm

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: Φ600-800mm

Outer diameter: Φmax=1800mm

Strip steel width: 280mm-860mm

Strip steel thickness: 4.0mm-12.0mm

The maximum weight: 15.0 tons

c) Electric installed capacity: appro. 1800KW

d) Size of the whole line: appro. 130X16m

e) Line Speed: 10-40m/min

Forming & sizing section

5.1 Forming mill gearbox, universal joint

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

5.1.2 Forming mill consists of:

- Driven stand: 12 sets (Horizontal)

- Driven stand shaft: Φ 180mm

- Material of shaft: 42CrMo

- Side roll stand: 9 sets(Vertical)

- Side roll stand shaft: Φ120mm

- Material of shaft: 40Cr

- Gear box & universal joint: 12 sets

- Material of gear box: cast steel

- Material of gear: 20CrMnTi

- Main motor: 185kW 2 sets

- Main redactor: 2 sets

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

5.2 Sizing mill gear box, universal joint

5.2.1 Sizing mill consist of:

- Driven stand: 6 sets (Horizontal)

- Driven stand shaft: Φ 180mm

- Material of shaft: 42CrMo

- Side roll stand: 6 sets (Vertical)

- Side roll stand shaft: Φ 120mm

- Material of shaft: 40Cr

- Gear box & universal joint: 6 sets

- Material of gear box: cast steel

- Material of gear: 20CrMnTi

- Main motor: 200kW Model: Z4-280-21 1 set

- Main redactor: 1 set

- 2 sets single head Turkshead, with 4 rollers*2sets

- 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.