API 5DP drill pipe production line is composed by induction heating furnace, automatic feeding and discharging device, hydraulic upsetting press, drift mandrel testing machine, drill pipe heat treatment line, hydraulic straightening machine, oil country lathe, friction welding machine, welding area heat treatment line, painting machine, length & and weight measuring machine and color coding & marking machine, etc.
I. Product range
Drill pipe diameter range: from 60.3 mm to 168.3 mm (from 
” to 
”)
Steel grade: E75, X95, G105 and S135
Upsetting forms: EU, IU and IEU.
II. Productivity
0.5 piece/min, 2 shifts/day, 260 working days/year.
Productivity per year 0.5×60×2×8×260=124,800 pcs
III. Key equipment description
1. Hydraulic upsetting press
Hydraulic upsetting press chosen for this production has enough capacity to upset the minimum and maximum tube body from ” to ” (from 60.3 mm to 168.3 mm ).
2 sets of hydraulic upsetting presses are placed simultaneously, one set of hydraulic upsetting press is used to finish upsetting to one end of tube body, another set of hydraulic upsetting press used upset another end of tube body, which greatly increase the productivity and efficiency.
The whole upsetting processes, from including tube loading, tube conveying, feeding, induction heating, die clamping, upsetting, die cooling and die lubrication, are full automatic.
2. Drift mandrel testing machine
After upsetting, drift mandrel testing should be done according to API 5DP standard.
This drift mandrel testing machine is a special equipment for oil pipe diameter quality inspection. It adopts standard diameter gauge to test the cylindricity and straightness of the tube body after upsetting.
3. Oil country lathe
Our company can supply economy type flat bed CNC oil country lathe, moderate slant bed CNC oil country lathe and high performance CNC oil country lathe.
Economy type flat bed CNC oil country lathe is equipped with double pneumatic chucks, V4 electric turret, SINUMERIK808D or Fanuc 0i-TF CNC system.
Slant bed CNC oil country lathe is equipped with double hydraulic chucks, H8 hydraulic turret, Fanuc 0i-TF CNC system.
All of 2 types of oil country lathes can be used for facing and boring to tube body after upsetting.
4. Hydraulic friction welding machine
The hydraulic friction welding machine can realize automatic tube body feeding, friction welding, inside and outside welding bead removing, drill pipe discharge after welding. The inner welding bead removal is realized by internal punch, outer welding bead removal is done by cutting tool. The equipment actions are consistent, accurate, and the welding part of workpiece is welded at full contact surface, axial and radial orientation is accurate.
The first and second classes of friction and upsetting are controlled by time, and the time parameters can be preset or changed by PLC and touch screen, which is convenient to change the standard and realize automatic welding when welding many kinds of workpieces.
In the welding process, spindle speed, axial pressure, slide displacement, spindle motor current curve, data and switches state can be displayed in real time.
5. Welding area heat treatment line
Intermediate frequency induction furnace is used to heat the welding area of drill pipe to annealing temperature to remove welding stress. After that, welding area is heated to quenching temperature, then water is sprayed to welding area for cooling. At last, welding area is heated to tempering temperature and kept in this temperature for some time.
The induction coils have functions of position adjustment(up and down, left and right, front and back) to ensure accurate heating position.
During the heating process, drill pipe is rotated on the pipe conveyor to ensure uniform temperature.
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