High Frequency Welded Pipe Mill 1.0mm-3.25mm Wall Thickness Steel 21.3mm-33.7mm

HG60 high frequency straight welded pipe production line is used to manufacture welded steel pipe of Φ21.3mm-Φ33.7mm with 1.0mm-3.25mm of wall thickness, can produce same size profiled pipe.After we absorbed advanced pipe making technology from both abroad and domestic, our innovative designed production line and each single unit of the production line is not only economical but also practical.

II. Basic Conditions:

2.1 Steel pipe specification

2.11 Round Pipe: φ21.3—φ33.7mm Thickness: 1.0 - 3.25mm

2.2 Strip steel

2.2.1 Strip steel width: 65-110mm

2.2.2 Strip steel thickness: 1.0mm-3.25mm

2.2.3 Low carbon steel and low alloy steel: δb≤500Mpa σs≤235MPa

2.2.4 Steel strip coil: Inner diameter: Φ550-610mm (buyer confirm finally)

2.2.5 Outer diameter: 1000mm-1800mm (buyer confirm finally)

2.2.6 Steel strip weight: Max 3.5T

2.3 Electric installed capacity: approximately 400KW Power supply: 380V, 50Hz (According to Local)

2.4 Forming speed: Max. 90m/min

P.S: Max. diameter& max. thickness doesn’t correspond with the max. speed

2.5 Size of the whole line: Approx. 60X6m

III. The technical flow of the production line

Scroll up → Uncoil → Cutting head, tail → Strip Steel head-tail butt welding → Spiral accumulator→ Forming → High frequency induction welding → Removing external burr → Sizing → Cutting→ Checking& collecting → Weighing → Marking → Accessing Warehouse

IV. Equipment makeup and main parameters of single unit:

• Hydraulic Single-Cone Uncoiler

This equipment has Single-cone hydraulic clamping. The uncoiler cones head clamp the steel coil with the function of cone moving cylinder. Then press roller of the end opener moves down to tighten steel coil. The uncoiler cone rotating, the end s opener peeler swings up and close to the coil. When steel coil head rotate to the peeler, it will shovel the coil head and flatten it.

Inner diameter of the strip steel:Φ 550-610mm

Outer diameter of the strip steel:Φ max=1800mm Strip steel width: 65-110mm

Strip steel thickness: 1.0mm-3.25mm

The maximum weight of the strip steel: 3.5T

2. Shear & Welder

Function:

It is used to parallel cut the tail of the steel strip, which has just gone into the accumulator, and the head of the strip coming out of uncoiler, and then weld them together.

Structure: Hydraulic Shearing and manual welding Strip steel width: 65-110mm Strip steel thickness: 1.0mm-3.25mm Centering way: manual

3. Horizontal spiral accumulator

Spiral accumulator is used to receive strip steel discontinuously from uncoiler and at the same time provide the steel strip to forming unit continuously.The capability of reservation can be controlled by spiral parallel. The circumference difference of outer and inner parallel multiply by number of parallel is the capability of reservation. There are guide roll supporting stand and torsion area in front of spiral accumulator. Steel strip will be turned from horizontal state to vertical state. Guide roll supporting stand is made up of carrier frame and holder and two vehicle withdrawal rolls, vehicle withdrawal rolls can alter strip steel from horizontal state to vertical state. Vehicle withdrawal roll is driven by electric machine, which and drive unit of accumulator is controlled by operating table.

Steel width: 65-110mm

Strip steel thickness: 1.0mm-3.25mm

Storage length: 400-1000mm

Max exit Speed: same as the speed of whole line. Working style: outside entrance and inside exit

4. Forming & Sizing Mill

Forming Section:

Horizontal Roll Stands: 7 Vertical Roll Stands: 9

Welding Section:

Guide Roll Stand; Squeeze Roll Stand; weld scraping stand; Grinding Stand; Water Cooling

Sizing Section:

Equipment Main Structure and Performance

Feeding Set

Mainly to upper and lower limit of strip steel, easy for strip out of the loop smoothly into the forming machine, prevent strip bobbing up and down.

Consists of a pair of roller and left and right bracket, the roll material is Gr15, high frequency quenching process.Quenching hardness HRC58-62, the left and right bracket is the steel plate welding structure

Five roll Passive leveler machine

Mainly to level off the steel strip ,for strip into the machine smoothly, prevent strip bobbing up and down

Using upper 2 lower 3 five roller type structure, the above two roller can adjust alone, respectively to control the clearance of the upper and lower roller, ensure leveling effect, leveling roll material is Gr15, high-frequency quenching, quenching hardness HRC58-62

Horizontal roll stand

Horizontal roller frame is the key components of the forming and sizing mill,by the strip into the pipe billet and the guarantee of the size precision of steel tube is done by it

Horizontal roller stand with gantry structure, side out roll change

Diameter of Horizontal Roll Shaft is Ф65mm; material is 40Cr; high frequency quenching. Vertical roll stand

Vertical roll stand is the key components of the forming and sizing mill, main help horizontal roller deformation, prevent strip rebound, absorb part of the edge of the waiting stretching

Vertical roll stand adopts single screw adjusting operation, on the roll change

Diameter of Roll Shaft is Ф40mm, material is 40Cr, high frequency quenching.

Conditioning treatment after rough turning, and then to finish turning, after finish turning high frequency quenching, quenching hardness HRC45-55,grinding after high frequency quenching, the surface roughness is less than 0.8, the coaxial degree is less than 0.02, face runout is less than 0.02

Weld Seam Guide Stand

Weld Seam Guide Stand is mainly control the size of the opening corner and the direction of the weld, the weld accurately into the extruding roller, to ensure the welding quality, guide roller frame can be plus or minus 20 degrees along the pipe axis rotation, adjust up and down, and around.

Squeeze Roll Stand

Squeeze Roll Stand is mainly to the high frequency heating pipe billet extrusion into welded pipe, is a major part of the guarantee welding quality, extruding roller frame structure is the same with vertical roll

Squeeze Roll Shaft Dia. is Ф45mm; material is 40Cr; high frequency quenching.

Conditioning treatment after rough turning, and then finish turning, after finishe turning high frequency quenching treatment, grinding after high frequency quenching

Remove external burr Device

It is used to scrap weld seam and remove external burr. It is made up of two cutters for using alternately. If one is damaged, the other one will take the place to scrap. Scrapers can be adjusted and have the quick lift function by cam. There are two supporting roller underneath knife rest, in order to bear the overdraft of scraping.

Water cooling

It is used to chill weld area for ensuring steel pipe be straighten precisely. It adopts the structure type that combines sprinkling and water bath into one.

Rough Straightening Device

Another name is Turks head and stated at the last part of sizing mill, it is used to straight strip pipe coarsely. It is made up of two sets of four- roller straightening and head can revolve and adjust for right and left. It utilizes three-point way to straight steel pipe.