good quality, besy price, low noise

1. General Introduction

HG50High-Frequency Welded Pipe Production Line are able to produce welded pipes of φ12～φ60mm in diameter and 0.8～2.2mm in wall thickness as well as profile pipes of the corresponding size. Adopting roll pass design, the production line can manufacture welded steel pipes with good quality machining and high precision assembling.

2. Main Specification and Technical Data2.1 Raw Material (Steel Strip)

1) Comply with YB189-64 standard.

2) Low carbon steel, low alloy constructional steel

3) Mechanical properties σb≤520Mpa，σs≤340MPa

4)Width range of steel strip 36～180mm

5)Thickness of steel strip 0.8～2.2mm

6) Strip coil

2.2 Pipe Specifications

1) Round Pipe Diameter φ12～φ60mm

 Square pipe 10×10mm～40×40mm

Rectangular Pipe 10×20mm～30×50mm

2)Round Pipe Wall Thickness 0.8～2.2mm(Square/Rectangular≤1.8mm)

3)Length of Cutting  4～7m

4) Length-cutting precision 0～6mm

2.3 Forming Speed 20～90m/min2.4 Total Power Capacity Approx.250KW2.5 Compressed Air1) Flow speed: 6m3/min

2)Pressure 5～7kg/ cm2

2.6 Water Supply for Main Mill

1) Flow Speed 20T/h～30 T/h

2) Pool Capacity  25m3

2.7 Requirements of Workshop

Width 6m Length 60m Height (from Ceiling Trail to Floor) ≥5 m

3. Whole Procedure

Slitting Steel Coil→ Coil feeding → Uncoiling→Cutting and Welding →Cage Accumulator→Forming、HF welding、Deburring、Cooling、Sizing 、Rough Straightening →STD Flying Saw→Checking and Collecting →Packing → Storage

4. Operation Principle and Main Structure

4.1 Double-Cone Uncoiler  KJ50

 Uncoiler is used for supporting strip coil and providing steel strip for the line. It has two cones, one of which prepares for another coil while the other is working.

Outer Diameter of Coil φ1000～φ1400mm;Inner Diameter of Coil  φ480～φ520mm;Thickness of strip 0.8～2.2mm;Width of Strip  36～180mm;Weight of Coil 2T

4.2 Cutting and Welding Machine JH50

Its main function is cutting out the redundant ends of the coils and connecting each other by butt-welding to guarantee continuous production.

Width of Strip  36～180mm

Thickness of strip 0.8~2.2mm

Work cycle max.180s

Work process cutting, then connecting and welding the steel strips by hands.

4.3 Cage Accumulator WLLH50

Accumulator is used for accumulating some strip and sending strip to the main mill continuously. The accumulated strip is pulled out of the accumulator by the main mill.

Width of steel strip  36～180mm

Thickness of steel strip 0.8～2.2mm

Length of the accumulated strip approx. 250m

Accumulating speed Max200m/min

4.4 Forming and Sizing Machine  HGZ50

Steel strip is fed into the forming machine, which rolls steel strip into pipe shape, round or profile.

Then, high frequency induction heating equipment concentrates high frequency current on the two edges of pipe skelp, and, due to the skin effect and the kindred effect, the edges are heated rapidly to the welding temperature and then almost immediately squeezed together under the pressure of squeeze rolls.The welded pipe finally becomes the finished product in expected size after the final cooling, sizing and roughly straightening.

1) Standard height of bottom line of rolling 775mm

2) Main parameters

Outer Diameter of pipe Φ12～Φ60mm

Outer diameter of square pipe10×10mm～40×40mm

Outer diameter of Rectangular pipe 20×10mm～50×30mm

Wall Thickness of pipe  0.8～2.2mm (Square/Rectangular≤1.8mm)

Forming Speed 20～90 m/min

Power of Main Motor 75KW  1set.

3) Layout order of rollers

Forming process needs 7 horizontal rollers and 8 vertical rollers. Sizing Process needs 5 horizontal rollers and 5 vertical rollers. Two Turkey heads are used to roughly strengthen pipe.

(Horizontal Roller, Vertical Roller, and Turk Head are respectively short for H, V and T.)

Strip Feeding—H1—H2—V1—H3—V2—H4—V3—V4—V5—H5—V6—H6—V7—H7—V8—Guiding—Squeezing—Scraping burs—Polishing—Cooling—V9—H8—V10—H9—V11—H10—V12—H11—V13—H12—T1—T2

4) Horizontal Roll Stand

Adopt portal structure with good rigidity and convenient adjustment.

Material of the stand QT450.

Shaft diameter of horizontal roller Φ50mm

Material of horizontal roller 40Cr

Heat treatment: hardening and tempering(HB260～290); superficial hardening(HRC50～55).

Material of bearing slider  forging 45.

5) Vertical Roll Stand

Adopt two-support structure with good rigidity.Shaft diameter of vertical roll: Φ30mm Material of vertical roller  QT450

6)Distribution Box

Adopt spiral bevel gear driving style with strong support, high efficiency, and long life span.

Material of box iron casting HT200

Material of spiral bevel gears 20CrMnTi (Carbonization quenching)

Quantity of moulds 10

7) Main Drive System

Be driven by direct current motor with stable and reliable speed regulating system.

8) Squeeze Roll Stand

Adopt two-roller squeezing style, which is easily controlled and has strong squeezing strength to make good-looking pipes without scratches.

9)  “W” Pass Forming design

Advantages: efficient, reliable and energy-saving.

10)  High-Frequency Induction Welding Method

Advantages: convenient and efficient for operation

11)  Supply Scope

Feeding Device

Forming Mill( 7horizontal rollers and 8 vertical rollers)

one Seam Guide Device

Squeeze Roll Stand (two-roll)

Deburring Machine (two scrapers)

one polishing roll stand

Cooling System

Sizing Mill (5 horizontal rollers, 5 vertical rollers and 2 Turk’s heads)

12 Spiral Bevel Gear Reduction Boxes

Main drive system (2 direct current motors and 2 decelerators )

Working Table for all the units above

4.5 STD Flying Saw FJZ(Y)50

It's used to precisely cut the pipe to length automatically under the condition that the pipe continuously delivered from the mill at high speed.

Fixed Length 4～7m

Cutting Accuracy 0～6mm

Max times of cutting 12 times/min

Max speed 80m/ min

Cutter’s line Speed 90 m/ s

Cutter size: φ600×4m

Cutting AC Motor Power 11KW

Motor-driven Power（Direct current）15KW

Air Pressure 5～7kg/ cm2

4.6 Packing Machine

Auxiliary equipment used for packing pipes in hexagon shape