Preface：According to the requirements in terms of equipment design, in this workshop will decorate Φ219 seamless steel tube production line, the structure form of punch adopts vertical roller type, accel limit mandrel mill, 14-frames reducing mill, chain cooling bed, six roller straightening machine.
Design condition 1.Tube blank specification 1.1 Diameter：Φ130、Φ150、Φ180、Φ210mm（Reserve Φ230mm） 1.2 Length：1500-3200mm 1.3 Height：max870kg 1.4 Material：Plain carbon steel and alloy steel Capillary specification: Diameter：Φ140-250mm 1.2 Length：max9500mm Arakawa tube specification Diameter：Φ130-230mm Length：max12500mm Finished product specification Diameter：Φ88.9-219mm Wall thickness：6-30mm Length：max12500mm 4.Rolling temperature： 1270℃ Main performance parameter： Tube billet heating zone： 出炉台架 Flitch width 2600mm Conveyor Roller Conveying speed 0.81m/s Transition platform Feeding hydraulic cylinder diameter： ø80mm 1 set Piercing Mill Area： 2.1 Entry table of Piercing Mill Pushing force of billet pusher 45KN Guide Slot Locking Hydraulic Cylinder： ø80/ø56 1 set 2.2 Main frame of perforator Roller diameter ø800-ø700 mm Length 700mm Roller speed 78-106r/min Feed angle 10°-15°adjustable Rolling angle 15°fixed Maximum opening of roll gap in rolling mill (when both rolls are ø800mm) 260mm Rolling torque Max 220KNM 2.3 Main drive of piercing machine Motor power 1600KW（DC）2 sets Reducer speed ratio 5.62（Hardened tooth surface） 2.4 Piercing machine outlet section 1 2.4.1 1Three-rollers guide device 1 Aperture ø120-ø280mm 2.4.2 Output roller table Roller specification ø206.3/ø150*210mm 2.4.3 Withdrawal device Hydraulic cylinder ø63/45*300mm 2.4.4 Three-rollers guide device 2 Aperture ø120-ø250mm 2.4.5 Feeding device Hydraulic Cylinder for Material Distribution ø100 1 piece 2.4.6 Three-rollers orientation adjustment device Motor power 5.5KW Output speed 100r/min 2.5 Piercing machine outlet stage 2 2.5.1 Locking device Blocking Hydraulic Cylinder ø63/45*25mm 2.5.2 Push-rod thrust car Thrust stop 800KN Speed max 2.5m/s 2.5.3 Transmission Device Motor power 150KW（Adjustable speed, low allotment）1set Speed 1600r/min 2.6 Capillary discharge rack Chain drive motor power 22KW Speed 712r/min Chain running speed 1.2m/s 3.Pipe Rolling Area： 3.1 Mandrel Operator Motor power 250KW（Provisional） 3.2 Mandrel Lubrication Station Lubricant Pressure 8-10MPa 3.3 Pipe Mill Entrance Platform Opening Degree of Three-roll Core Holding Device ø120-ø250mm 3.4 Main frame of pipe rolling mill Roller diameter ø450-380mm Roller length 400mm Rolling angle 0°-6° Feeding angle 0°-12° Rolling torque Rolling speed Quick opening of each roll strip 3.5 Main Drive of Pipe Milling Motor power 2400KW（DC） 1 set Speed ratio of reducer 1.69（Hardened tooth surface） 3.6 First section of pipe mill outlet table Motor power 3KW 3.7 Second spection of pipe mill outlet table Rolling motor power 3KW 4.Reducing Mill area： 4.1Conveyor Roller after Reheating Furnace Roller table specification： ø180*ø260*260 Motor power： 1.5KW 4.2 Swing table in front of reducer Roller table specification： ø180*ø260*260 Motor power： 1.5KW 4.3 High pressure water phosphorus removal device High pressure water pressure 18MPa Pressure of the phosphorus removal device on the nozzle：18MPa Sprinkler ring 2sets 4.4 14 racks reducing unit Rack number： 14 Ideal diameter of roller ø480mm Roller width 210mm Rack spacing 440mm （DC）Motor power 147KW*14 Revolution 800/1600/2000 r/min Overload coefficient 2 4.5 Back Swing Roller Table of Reducer Roller table specification：ø180*ø260*260 Motor power： 1.5KW 5 Cooling bed area 5.1 Cooling bed entrance Roller Roller motor power 1.5KW 5.2 Chain cooling bed Cooling bed specification Length 14000mm Width about 60000mm（Divided into four sections） Pitch of chain 328mm Power of transmission motor in transport chain 37KW（Adjustable speed）4 sets Speed 550-1100r/min Power of Push Chain Drive Motor 18.5KW（Adjustable speed） 1set Speed 975-1600r/min 6.Straightener area 6.1 Straightener entrance roller Roller motor power 1.5KW 6.2 Straightener Parameters of Corrected Steel Pipe Specification： Outer diameter ø88.9-ø219mm Thickness 6-30mm Length 6-12.5m Technical parameters of straightener Permissible bending before straightening ≤ 20mm/m Permissible temperature before straightening ≤ 200°C Straightening speed 30-80m/min Roller spacing 2*900mm Straightening roll throat diameter/roll length ø350/460mm Installation angle of straightening roll 34.5°（31.5°-37.5°adjustable） Alignment of straightening rollers 2-2-2（Top three, bottom three, full drive） Column tension： 400KN（Each column） Main drive motor： Power 144KW Speed 675-1700rpm Rated voltage 400V Main drive reducer （2 sets） Speed ratio 5.314 Hydraulic adjustment 6.3 Pinch roll at the outlet of straightener Motor power 5.6KW 6.4 Back leveling platform Length： 14000mm Width： 4000mm Process characteristic The hot rolling production line adopts the production process of fungus roll piercing machine + assel full floating mandrel rolling machine +14 frame microtension reducing machine. This technology has the world advanced level, the equipment movement is reliable, the production efficiency is high. Its main technical features are： 6.4Adopt fungus roll punch The main technical features of the fungus roll piercing machine are as follows： Difficult deformable capillaries such as thin-walled and high alloy steel can be pierced: The rolls of bacterial piercing mill are conical, and the diameter of rolls increases gradually from the inlet to the outlet, which is consistent with the increase of metal flow speed during piercing, thus reducing the circumferential shear force acting on the billet, and is conducive to reducing the internal and external surface defects. High alloy steel and thin capillary can be pierced to provide high quality capillary for tube rolling mill. At the same time, it can also change the piercing, the extension distribution between the two processes of pipe rolling, and increase the elongation of piercing mill, which creates favorable conditions for configuring less stand continuous pipe rolling mill. Continuous casting round billet can be used as billet piercing: because of the role of conical work roll and its rolling angle and guide plate, the deformation and kinematics conditions of metal are changed, and the effect of rotary forging in the process of metal deformation is restrained. Therefore, the continuous casting round billet can be used to penetrate the capillary with less internal defects, good surface quality, high concentricity and uniformity of wall thickness, and the deviation of wall thickness of capillary is ±3-5%. High piercing efficiency: Bacterial roll piercing machine has high piercing speed, short piercing period and high output. It is suitable for use with continuous mill and Azel mill. It can achieve large extension and large diameter enlargement perforation: the elongation coefficient can be more than 4, and the diameter enlargement can be up to 30%, which is conducive to reducing billet specifications and expanding product specifications.
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