High Speed Tube Mill Production Line

What is the ERW steel pipe?

ERW tube or pipes are straight seams electric resistance welded pipe. in brief the ERW pipe, which is a round pipe welded by steel plates. It uses to transport vapor and liquid objects such as oil and natural gas. Electric resistance welding (ERW) refers to a group of welding processes such as spot welding and seam welding. faying surfaces where heat to form the weld is born by the electrical resistance of material combined with the time and the force used to hold the materials together during welding. In general, resistance welding methods are efficient and cause little pollution, however, their applications limited to relatively thin materials.

Electrical resistance welding

Electrical resistance welding will be welders parts formed pressed between two electrodes, and subjected to current, the resistor thermal effects generated by the current flowing through contact with the workpiece surface and the neighboring regions to be heated to melt the plastic state, so that metal-binding method. Resistance welding methods are mainly four types, namely, spot welding, seam welding, projection welding, butt welding.

passed between the two edges of the steel to heat the steel to a point at which the edges are forced together to form a bond without the use of welding filler material.A plate rolled to become a pipe and welded using the Electric Resistance Welding process.

ERW Steel Pipe Making Machine

High speed tube mill production line

The manufacturing pipe mill process or High Frequency ERW Pipe Mill Production Line generally involves the following stages in a step by step procedure.

  • Slitting
  • Uncoiling
  • Forming
  • Welding
  • De beading
  • Seam Annealing
  • Sizing
  • Cutting
  • Galvanizing (zink spray)

High frequency straight seam pipe making machine

  1. Slitting

Coils slit to predetermine widths for each size of pipes.

 

  1. Uncoiling

The slitted coil uncoils at the entry of tube mill line and the ends shear and weld one after another. LOTOS is able to offer the largest range of decoilers from manual to fully automatic, according to a range of strip widths and thicknesses.

 

  1. Accumulator

The main action of the accumulator is to accumulate a steel strip to keep continuously and automatically production in the welding pipe line.

 

  1. Forming

The slitted coils are formed into a cylindrical shape with open edges utilizing a series of forming rolls.

 

  1. Welding

In this stage, the open edges heate to the forging temperature through high-frequency, low-voltage, high current and press welded by forge rolls making perfect and strong.

 

 

  1. Sizing

After water quenching, a little decrease applies to pipes with sizing rolls. This results in producing the desirable precise outside diameter.

 

Advantages High Frequency ERW Pipe Mill Production Line

  • High production efficiency.
  • the machine works stably at a high speed, which improves the yielding of products.
  • Low wastage
  • High accuracy
  • one of the advantages of the ERW tube is that no fusion metals use and the weld seam cannot be seen or felt.

 

Slitting

slitting pipe mill

Uncoiling

decoiler-pipe-mill-line

Accumulator

Accumulator-pipe-mill

Forming

Forming-tube-mill-line

Sizing

sizing-tube-mill

Steel tube production line

. PRODUCE CAPACITY

No.ItemDataRemark
1O.D. Of round pipeΦ32mm~Φ127mm
2Wall thicknessRound pipe δ1mm~3mm

Square pipe δ≤2.5mm

3MILL SPEED30M/min~80M/min
4LENGTH4M~8M

STEEL STRIPS SPECIFICATION

No.ItemDataRemark
1W.T. of stripsΔ1~3 mmMATERIAL

C.S Q195, 235,

Galvanized Steel Strip

2Width of stripsH100~400mm
3O.D. of steel coilΦ800mm~Φ1500mm
4I..D. of steel coilΦ450mm~Φ550mm
5Maxi. Load weight≤5000kg

 

working flow

Raw material (steel coil) → uncoiling → shearing and butt-welding → material accumulating → non-power leveling →mill-forming → high-frequency welding → removing burrs outside of weld seam → Zinc spraying → cooling → sizing → roughly straightening → fixed length cutting → run-out table

. machine parts details

4.1uncoiler two type: hydraulic expanding

Structure type: Double-side 180ºrotary hydraulic expanding tightly, which insure steel coil feeding alternatively and make steel strip going into accumulator freely.

Structure typeHydraulic expanding double side
I..D. of steel coilΦ450mm~Φ550mm
O.D. of steel coilΦ800mm~Φ1500mm
Width of stripsH60mm~H320mm
Maxi. Load weight≤5000kg

4.2 Shear and butt-welder

Shearing and butt-welder, which insure double steel tidily and then welding and  leveling weld seam and supply strips for accumulator.

4.3 Vertical accumulator

It have two AC motor: one is feeding motor and the other is driven motor, and ensure steel strips inputting and outputting for forming.

Diameter of accumulator: Φ4500㎜

Feeding motor: YCT250-4A 18.5KW

Driven motor: YCT250-4B  22KW

TUBE MILL COMPONENTS

4.4 FORMING MACHINE

DescriptionItem Technical parameters
Horizontal-roll standsQuantitySeven stands
Material of horizontal standsHigh-precision forged steel
Diameter of horizontal shaftΦ80mm
Material of horizontal shaft42CrMO
Vertical-roll standQuantityseven stands
Material of vertical standsQT50
Diameter of horizontal shaftΦ50mm
Material of horizontal shaft45# forged steel
Driven gearboxQuantitySeven gearboxes
Material of gearboxQT50
TypeSpiral bevel gear
Material of gearbox20CrMnTi
Material of shaft40Cr
Power transmission methodFrom universal transmission joint to horizontal roll stands

Mainly roughly mill-forming steel strip and controlling weld seam.High Frequency ERW Pipe Mill Production Line.

4.5 Guide and squeeze and scraper

One set of guide roll stand for controlling direction of pipe seam to insure pipe seam flatly and straightly entering into extruding rollers.

One set of extruding roll stand for controlling weld seam to realize successful welding.

Two sets of scraper frame for scraping outside weld seam

Description Technical parametersRemark
Guide typeTurkish-heads type and 360°rotary
Welding rollstwo welding rollers   or

Three welding rollers

Scraper standsAdjusting pole and quickly feeding and exit

 

4.6 Zinc spraying: Repairing the welding seam Zinc surface

4.7 Cooling type: Sink and shower

tube welding line

4.8 Sizing machine

DescriptionItem Technical parameters
Horizontal-roll standsQuantitySix stands
Material of horizontal standsHigh-precision cast or forged steel
Diameter of horizontal shaftΦ80mm
Material of horizontal shaft42CrMO
Vertical-roll standQuantitysix stands
Material of vertical standsQT50
Diameter of horizontal shaftΦ50mm
Material of horizontal shaft45# forged steel
Driven gearboxQuantitySix gearboxes
Material of gearboxQT50
typeSpiral bevel gear
Material of gearbox20CrMnTi
Material of shaft40Cr
Power transmission methodFrom universal transmission joint to horizontal roll stands

Sizing device: Mainly fine shaping pipe after welding and controlling size accuracy. Each 6 sets of horizontal roll stand, vertical roll stand and drive gearbox, 12 sets of universal shaft.(structure same as forming device)

4.9 Roughly straightening machine frame

This unit is used for straightening the pipe after sizing, to reach the required straightness.

 Technical parameters
Straightening stands typeTurk’s head type, and 360°rotary
Diameter of straightening shaftΦ45mm
Material of straightening shaft40Cr

4.10 Main driven motor

 Technical parameters
Main driven motor power2*132 KW
Reducer modelZLY250

 

4.11 Computer controlled cutting machine

Usage: Cutting online as per setting length

No.TypeCNC controller, normal/hot cutting
1Cutting Maxi. DiameterΦ127mm
2Cutting Maxi. Wall-thicknessδ3.0mm
3Cutting toleranceL=4~8m,  ≤±3mm
4Cutting driven typePneumatic feeding and exit
5The specification of saw bladeΦ550㎜
6Cutting motor 37  KW
7Cutting speed80M/min
Rating
stainless-steel-tube

Product Name: High Frequency ERW Pipe Mill Production Line

Product Description: ERW tube or pipes are straight seams electric resistance welded pipe.

Brand: LOTOS

Offer price: 16

Currency: $

Availability: InStock

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