I. Summary

The Machine is intended for manufacturing round pipe of Φ20mm-Φ50mm with thickness of 0.8mm–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}→→ 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:

a) Steel Pipe Specification

1. Pipe diameter:              Ø20 –Ø50mm

Pipe Thickness:             0.8 – 3.0mm

2. Square & Rectangle Pipe:    15X15mm –40X40mm

Pipe Thickness:             0.8 – 2.0mm

3. Pipe Length:                6.0m – 9.0m

4. Length Tolerance:           0-6mm

b) SteelTape Specification

1. Material:        Carbon steel (δb≤500Mpa, δs≤235Mpa)

2. Steel Tape: Inner diameter:      Φ470-510mm

Outer diameter:      Φmax=1500mm

Strip steel width:      60mm-160mm

Strip steel thickness:  0.8mm-3.0mm

The maximum weight: 1.5 tons

c) Electric installed capacity:     appro. 400KW

d) Size of the whole line:          appro. 45X5m

e) Line Speed:                    40-100m/min

Forming & sizing section

4.1   Forming mill gearbox, universal joint

4.1.1   Mill entry flattener by five-roll passive levelling, one pair of sending roll, two pairs of vertical roll

4.1.2   Forming mill consists of:

-      Driven stand:            7 sets (Horizontal)

-        Driven stand shaft:             Ø60mm

-      Material of shaft:         40Cr

-         Side roll stand:                 8 sets(Vertical)

-         Side roll stand shaft:       Ø40mm

-      Material of shaft:          40Cr

-         Gear box & universal joint: 7sets

-      Material of gear box:      cast steel

-      Material of gear:          20CrMnTi

4.2        Sizing mill gear box, universal joint

4.2.1   Sizing mill consist of:  

-            Driven stand:               5 sets (Horizontal)

-         Driven stand shaft:              Ø60mm

-      Material of shaft:          40Cr

-         Side roll stand:                  5 sets(Vertical)

-         Side roll stand shaft:        Ø40mm

-      Material of shaft:          40Cr

-         Gear box & universal joint: 5 sets

-      Material of gear box:       cast steel

-      Material of gear:           20CrMnTi

4.2.2   2 setsTurk’s head, with 4 rollers*2sets

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

4.3   Main motor:  100kW   Model: Z4-250-31  1 set

Main reducer:      1 set