HF STRAIGHT SEAM WELDED TUBE MILL LINE

I. Summary

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The mill 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.