TENENG ERW Tube mill machine carbon steel round, square & rectangle pipe HG254

Hydraulic Double arbor Uncoiler with peeler & coil car

The uncoiler adopts a double-cantilever reel with a hydraulic four-link expansion and contraction structure. It is equipped with a coil car featuring electric traveling and hydraulic lifting functions, a pinch roller, a coil pusher, a straightener, a coil anti-loosening device, a coil inertia brake damping device, a hydraulic system, and an electric control system. The reel is powered to enable forward and reverse rotation, and its power can be disconnected via a clutch. Composition of Main body and reel, pinch roll device, coil head aligning drive device, braking system, operation console, straightening and bending guiding device.

Pinch & Leveller

It is used for leveling the head and tail of the steel strip, and driving the steel strip to the shearing and butt welding machine. A 7-roll leveler is adopted (one pair of pinch rolls, three upper leveling rolls and four lower leveling rolls). The upper pinch roll is driven by a hydraulic cylinder. The upper leveling rolls are adjusted downward through two sets of hydraulic motors driving worm gear transmissions to actuate the adjusting lead screws. Side guide rolls are equipped on both sides of the leveler. The material of the pinch rolls, leveling rolls and side guide rolls is GCr15 (heat-treated to HRC 60-62). The whole machine adopts lower transmission, and the motor can be controlled for forward and reverse rotation. 

Automatic shear & butt welder

The automatic shear and butt welding machine is controlled by PLC, driven by a hydraulic system, and adopts CO₂ gas shielded automatic welding. Both the shear blades and the welding head are mounted on the welding carriage. After the head and tail of the steel strip are sheared and clamped, the welding head aligns with the weld seam to perform automatic welding. The weld seam forms a spiral line on the pipe wall, which enhances the weld strength.  Its characteristics are as follows: automatic weld seam positioning, automatic weld width setting, and adjustable welding torch traveling speed, which avoids the common problem of low alignment and seam-joint precision in other shearing and welding machines. The welding base plate is made of copper. The welding machine adopts the Tangshan Panasonic gas shielded welding machine, and the weld seam is inclined at an angle of 3°. 

Spiral accumulator

The horizontal spiral accumulator is used for steel strip storage and provides uninterrupted feeding for the main welded pipe mill, ensuring the continuous production of the main mill. It adopts a fixed-loop structure with the steel strip feeding from the outside and discharging from the inside (the feeding and discharging directions can be arranged according to user requirements). The discharging is realized by the synchronous pulling of the inner cage driving rolls and the rolling mill. The motors for the pinch rolls and the silo are frequency-controlled variable-speed motors. This equipment features low discharging resistance, no scratches or local plastic deformation on the steel strip, uniform wear of all mechanisms, low roll and bearing consumption, stable operation with low energy consumption and noise, as well as easy operation without faults such as cage expansion and strip jamming. 

Forming section

The forming section shapes the steel strip into steel pipes of the required cross-sectional dimensions via roll bending deformation. In the forming zone, the steel strip is roll-bent into a tube blank of the corresponding specification. Then, the high-frequency welding machine utilizes the skin effect and proximity effect of high-frequency current to heat the edges of the formed tube blank to the welding temperature (1130–1350 °C), followed by extrusion welding under the action of squeeze rolls to form a closed tube blank.

Welding section

The guide roll stand is installed in front of the squeeze rolls in the welding section, which serves to guide the weld seam and control the opening angle, ensuring the tube blank smoothly enters the squeeze rolls for welding. A weld scarfing device and a polishing roll stand are arranged behind the squeeze rolls. After welding, the tube blank passes through this section where the external weld burrs are planed off. Then, the weld seam is polished by the polishing rolls, and the tube blank is guided to the intermediate frequency (IF) weld annealing process, followed by air cooling and water cooling sections. The water-cooled tube blank then enters the sizing section.

Sizing section

The sizing section rolls and bends the round pipe into a steel pipe of qualified dimensions via roll bending. After sizing, the tube blank meets the cross-sectional specifications and precision requirements of the finished product, and then enters the flying saw machine after straightening.

Turkshead

It is located at the final section of the sizing mill. Its main function is to perform rough straightening on steel pipes. Composed of two 4-roll rough straightening stands, it allows adjustments in vertical, horizontal and circumferential directions. The three-point straightening method is adopted to straighten the steel pipes.

Milling saw

The entire system adopts the combination of Siemens fully digital motion control system Simotion and Profinet network. All servo motors are controlled via the network. System parameters are input through a 10-inch touch screen, ensuring clear and accurate display of system operating parameters and real-time recording of system alarm information. The base of the flying saw is made of welded steel plates, which is machined after tempering. All moving components are driven by linear guides and ball screws, with a built-in lubrication system. The entire flying saw features stable and reliable mechanical performance and an advanced electric control system. 

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