1. Brief introduction

The mill is intended for manufacturing of round pipe of Φ10mm-Φ80 mm with thickness of 0.4mm–3.5mm 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.

2. 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

3. Equipment makeup and main parameters of single unit:

1. Double-head un-coiler

1.1. Briefing: Rotary type to change coils easily, with a pneumatic brake

1.2. Parameters:

-     Coil width:    max.160mm

-     Coil OD:         max. Ø1500mm

-     Coil ID:        Ø 470- Ø 510mm

-     Coil weight:   max. 1.0 tons

1.3. Mandrel expansion by Pneumatic

1.4. Mandrel position rotation shall be manual

1.5. Pneumatic brake

2. Shearing & butt welding machine

2.1 Hydraulic shearing parameters machine:

-     Cutting by hydraulic

-     Width:       ≤160mm

-     Thickness:   ≤2.0mm

2.2 Butt welding machine by manual

  -     welding machine

3. ※Horizontal spiral accumulator

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

※Cage loop
3.1 Feeding speed:         200m/min
3.2 Pinch roll drive:         7.5 KW AC motor with gear box
3.3 Pinch roll Dia.:          150mm
3.4 Storage:               300-400m

4. Forming & sizing section

4.1   Forming mill gearbox, universal joint

4.1.1   Mill entry flattener by five-roll passive leveling, 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:         Ø45mm

-      Material of shaft:         40Cr

-         Side roll stand:             8 sets (Vertical)

-         Side roll stand shaft:    Ø30mm

-      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:                 4 sets (Horizontal)

-         Driven stand shaft:          Ø45mm

-      Material of shaft:          40Cr

-         Side roll stand:              4 sets (Vertical)

-         Side roll stand shaft:     Ø30mm

-      Material of shaft:          40Cr

-         Gear box & universal joint: 4 sets

-      Material of gear box:      cast steel

-      Material of gear:          20CrMnTi

-      3 sets single head Turk’s head, with 4 rollers*3sets

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

   4.3 Drived motor

-      Main motor:         55kW   Model: Z4-200-31 1 set

-      Main redactor:            1 set

 

5. Welding section

5.1     Welding section consist of:

       -      Seam guide unit:                 1 set

-      Squeeze stand:                    2 rollers 

       -      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 m

5.3 Solid state High frequency welder (GGP220KW)

-  Nominal power: 220kW

-  Rated DC power: Pd=120kW

-  Rated DC voltage: UdN=450V

-  Rated DC current: IdN=270A

-  The whole efficiency: η≥85%

-  Output power: Pout＞100kW

-  Designed frequency: f=450~500kHz

-  MOSFET inverter: 60kW×2

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

-  With water-water cooler for welder

6. CNC flying friction saw

7.1     Flying cut-off, mechanical section consist of:

-   Saw disk:           OD400mm×ID40mm×2.8mm

-   Saw waver:            Pneumatic

-   Pipe clamp:         Pneumatic

-   Saw carriage travel:  Rack and pinion with gear lath

       -      Motor for travel:      DC 11KW

-   Motor for cutting:     AC 11KW

-   Length Tolerance:        0-6mm

7.  Runout table

7.1 Run-out system consists of:

       -      Roller conveyer 10 meter (including packing box)

-     Reversed pneumatically

8.  Electric Control System

8.1     Spiral Accumulator

  -     DC 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     Cutting saw control system

       -      Saw carriage drive by DC motor 11 KW, CT-01 micro-computer

(with “England Eurotherm” and “American TI” 32bits DSP chip)

       -      LCD operation pane

(length and batch setting ,control instrument etc).

FAQ:

1.Does one machine can only produce one style pipe?

Not exactly. Our machines can produce more kinds of pipes by change their rollers.

2. Do you have after sales support?
Yes, we are happy to give advice and we also send skilled technicians to your place to support the technical guidance. We will let your machines running that in order to keep your business running.

3. What can you do if the machine broken?

Our machine's warranty period is 12months. And if the broken parts can't be repaired, we will send the new one to replace the broken parts. And the only thing you need to do is paying the transport costs. 

If beyond the warranty period, we can through the negotiation to solve the problems, and we will supply the technical support for the whole life of the machine.

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