I. Summary

The mill is intended for manufacturing 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.