The mill is intended for manufacturing of round pipe of Φ76 mm-Φ168 mm with thickness of 2.0 mm–5.0 mm 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.
I. Tube mill for making pipe
Coil→→ decoilerr →→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→→straightening
III. Basic conditions:
- a) Steel Pipe Specification
- Round Pipe diameter: Φ76 –Φ168mm
- Square pipe: 60X60mm –125X125mm
Rectangle Pipe: 80X40-100X50mm
Pipe Thickness: 2.0 – 5.0mm
- Pipe Length: 6.0m – 12.0m
IV. Equipment makeup and main parameters of single unit:
- Hydraulic Single-arbor uncoiler with peeler
Mandrel expansion by hydraulic, Mandrel position rotation shall be manual, Pneumatic brake.
- Five-roll Flattener
There are pairs of nipping and sending roller. Flatten rolls are arranged for two top and three below. Nipping and sending is pressured by hydraulic cylinder, flatter roll motor is cogged by worm wheel and worm screw reduced speed, the worm screws in front and one in back can come true be in-phase by sleeve connecting, which can ensure top leveling roll and under leveling roll be parallel, thereby which reach in the intention of flatten.
- Shearing & butt welding machine
3.1 Hydraulic shearing parameters machine: Cutting by hydraulic system
- 3. Horizontal spiral accumulator
The accumulator is composed by the following elements: Low bracket, Low bracket, Revolver, 7 rollers Flattening unit, 2 rollers feeding, and coil feeding system
Feeding speed: Max.200m/min
- Forming & sizing section
5.1 Forming mill gearbox, universal joint
Mill entry flattener by up-horizontal roll and below-horizontal roll, one positive five-roll flattener, one pair of feeding vertical roll.
Forming mill consists of: Driven stand, Side roll stand: 8 sets(Vertical) and Horizontal roller frame with worm gear & shaft. adjust up and down at same time and level.
- Welding section
6.1 Welding section consist of: Seam guide unit: 1 set, Squeeze stand: 4 rollers(Φ 90mm), de-burr frame: 1 set (2 heads and horizontal unit for seam ironing: 2 rollers
6.2 Cooling section of Cooling trough: 1 set of 4.0 m
6.3 Solid state High frequency welder(GGP400KW)
Tank circuit output mode: no welding transformer output, secondary resonance with water-water cooler for welder
- CNC flying friction saw
Saw carriage travel: Rack and pinion with gear lath
Motor for travel: DC 37KW
Motor for sawing: AC 90KW
Length Tolerance: 0-6mm
- Run-out table
8.1 Run-out system consists of: Roller conveyer 18 meter (including packing box) pneumatically
- Electric Control System
Horizontal spiral accumulator AC driver.
Double DC drive and control for forming and sizing mill of DC drive,
Main DC drive panel control(instrument etc.)
Mill operation panel (speed adjustment, control etc).
9.3 Flying cut-off control system
Saw carriage drive by DC motor 37KW,
LCD operation pane
(length and batch setting ,control instrument etc).
- Rollers
10.1 Forming and sizing Rollers material
Material: Cr12
Hardness: 60 HRC +/-2
10.2 Welding rollers material
Next： Welded tube mill round/square pipe making machine
