The mill is intended for manufacturing of round pipe of Φ50mm-Φ114mm with thickness of 1.0mm–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.

 

{SteelTape}→→ Double-head un-coiler →→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→→Zinc Pinting machine →→Cooling unit →→ Sizing unit and straightener →→Flying saw under computer-control →→ Run-out table

 

1. Round Pipe diameter:        Φ50 –Φ114mm

Pipe Thickness:             1.0 – 3.0mm

2. Square & Rectangle Pipe:    40X40mm –90X90mm

Pipe Thickness:             1.0 – 2.0mm

3. Pipe Length:                6.0m – 12.0m

4. Length Tolerance:           0-6mm

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

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

Outer diameter:    Φmax=1800mm

Strip steel width:   160mm-360mm

Strip steel thickness:1.0mm-3.0mm

The maximum weight:  4.0 tons

1. Dynamic power:  AC380V±10%, 3phases, 50Hz±1.0%

2. Control Power:  AC220V±10%, one phase, 50 Hz ±1.0%

d) Electric installed capacity:       appro.500KW

 1. Reservoir for High Frequency equipment:  20m³, one set

 2. Reservoir for circulating cooling water:    25m³, one set

1. Pressure:   0.4Mpa

2. Flow:       1.5m³/h

Annual output: 35,000 ton, according to the yearly working days、daily working hours and the products.

Eight people in total:  One for uncoiler, one for Strip-head Cutter and welder (spiral accumulator), one for Host control, one for flying saw, two for Run-out table. One is for the machine commissioning, one for electrical commissioning.

  i) Line speed:  30-70m/min

 

1.1. Parameters:

-     Coil width:    max.360mm

-     Coil OD:         max. Φ1800mm

-     Coil ID:       Φ470-510mm

-     Coil weight:   max. 4.0 tons

1.2. Mandrel expansion by hydraulic

2.1 Hydraulic shearing parameters machine:

-     Cutting by hydraulic system

-     Width:       ≤360mm

-     Thickness:   ≤3.0mm

2.2 Butt welding machine by manual

  -     TIG welding machine

3.1   Low bracket:          1 set

3.2   Revolver:             1 set

3.3   7 rollers Flattening unit: 1 set

3.4   2 rollers feeding:       1 set

3.5   Accumulator:          1 set

-   Feeding speed:         Max.200m/min

-   Storing capacity:        500meter -700 meter

3.6   High bracket:          1 set

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 80mm

-      Material of shaft:         40Cr

-      Side roll stand:           8 sets(Vertical)

-      Side roll stand shaft:         Φ45mm

-      Material of shaft:          40Cr

-      Gear box & universal joint: 7sets

-      Material of gear box:      cast steel

-      Material of gear:          20CrMnTi

-      Driven stand:             with worm gear(adjust up and down)

4.2      Sizing mill gear box, universal joint

4.2.1   Sizing mill consist of:     

-      Driven stand:                5 sets (Horizontal)

-      Driven stand shaft:         Φ 80mm

-      Material of shaft:          40Cr

-      Side roll stand:            5 sets (Vertical)

-      Side roll stand shaft:          Φ45mm

-      Material of shaft:          40Cr

-      Gear box & universal joint:  5 sets

-      Material of gear box:       cast steel

-      Material of gear:           20CrMnTi

-      2 set single head Turk’s head, with 4 rollers*2sets

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

-      Driven stand:             with worm gear(adjust up and down)

4.3 Main Motor:

-      Main motor:        160kW   Model: Z4-250-42  1 set

-      Main redactor:       ZLY250      1 set

5.1     Welding section consist of:

-     Seam guide unit:                  1 set

-     Squeeze stand:          2 rollers(diameter: Φ50mm) 

-     De-burr frame:                   1 set (2 heads)

-     Horizontal unit for seam ironing:      2 rollers

5.2    Cooling section

-     Cooling trough:                      1 set

-   Cooling trough length :             3.0 m

5.3  Solid state High frequency welder(GGP250KW)

-    Nominal power: 250kW

-    Rated DC power: Pd=300kW

-    Rated DC voltage: UdN=450V

-    Rated DC current: IdN=670A

-    The whole efficiency: η≥85%

-    Output power: Pout＞250kW

-    Designed frequency: f=300~350kHz

-    MOSFET inverter: 60kW×5

-    Tank circuit output mode: no welding transformer output, secondary   resonance

-    With water-water cooler for welder

6.1     Flying cut-off, mechanical section consist of:

-   Saw disk:           OD800mm×ID110mm×5.0mm

-   Saw waver:           Pneumatic

-   Pipe clamp:         Pneumatic

-   Saw carriage travel:  Rack and pinion with gear lath

-    Motor for travel:      DC 18.5KW

-   Motor for sawing:    AC 37KW

-   Length Tolerance:      0-6mm

7.1  Run-out system consists of:

-    Roller conveyer 15 meter (including packing box)

-     Reversed pneumatically

8.1     Horizontal spiral accumulate

-     AC driver.

8.2     Double DC drive and control for forming and sizing mill.

-      DC drive,

-      Main DC drive panel control(instrument etc.)

-      Mill operation panel (speed adjustment, control etc).

8.3     Flying cut-off control system

-    Saw carriage drive by DC motor 22KW,

-    LCD operation pane

(length and batch setting ,control instrument etc).

9.1     Forming and sizing Rollers material

-    Material:   Cr12

-    Hardness:   60 HRC +/-2

9.2  Welding rollers material

-   Material :   H13

-   Hardness:   50 HRC +/-3