| The caliber and diameter produced by the pipe expanding machine
The maximum diameter of steel pipe that can be produced on the pipe end expanding machine is 426~529 mm, while in the large periodic rolling mill, only Φ660 mm less seamless steel pipe can be obtained, so to get a larger diameter of non-rough steel pipe must adopt the method of expanding.At present, the main countries used in the broadening machine is hot dial and cross rolling two.In West Germany, the United Kingdom, the Czech Republic, Sweden and the United States and other countries have the inclined stretching machine, in France, the United States, the United Kingdom, Italy and Venezuela and other countries have the hot drawing expanding machine.The equipment of the cross rolling mill is more complex, and the steel pipe of the expanded diameter is easy to produce the spiral bar, and the surface quality is poor.Therefore, although its productivity is relatively high, at present, China still adopts the hot dial expanding machine, because the hot drawing mechanism is simple to build and easy to operate.
The hot drawing mill with 100 ton tension installed in the periodic mill of Dalmine in Italy can expand Φ420 mm steel pipe to 720~950 mm.When the diameter is enlarged, the tube heating well is dialed on the hot drawing machine and its diameter is enlarged.Heating once can be expanded four times, each diameter of 50~60 mm, so heating once can expand the diameter of 230 mm.Limited by the heating capacity and the speed of hot drawing machine, the drawing speed is about 5 meters/min, and the production capacity is 8~10 roots per hour.
The SCR, medium frequency induction heating coil, compensation capacitor, water cable, reactor and other components of the medium frequency power supply of pipe end reamer need circulating water cooling.The construction of the equipment:
1, cooling circulating water system (pool, water pump, water distributor, upper and lower water pipeline).
2. Storage platform for left and right steel pipes of the equipment.
3. Hydraulic oil for equipment: L-HM anti-wear hydraulic oil 32# ~ 100# (46# is recommended).
4. The equipment in the workshop is connected with wires and cables. See the equipment instruction manual for specifications.
5. Medium frequency induction heating coil and tube expanding die core can be purchased separately according to production needs.
6, auxiliary equipment: hydraulic pressure straightener, pipe end incision band saw, steel pipe testing equipment.
The advantages of tube expanding machine and intelligent constant temperature system
Pipe-expanding machine intelligent control medium frequency power supply at the time of expanding production will steel tube heated to the required temperature and constant, effectively avoid the human factors caused by steel pipe under the high temperature of steel pipe quality and mold scrapped, and to avoid the low temperature and the thermal expansion unit increased thrust rod or die fracture phenomenon, caused by eliminating the unsafe factors.Compared with manual operation, it can heat the steel pipe, save energy and protect the environment, simplify the operation procedure, reduce the labor cost, and make it possible for one operator to monitor more than one tube expanding unit at the same time for normal production and expansion.Each unit is equipped with two temperature measuring points for intelligent automatic temperature control.According to the preset heating temperature of different grades of steel tubes, the heating temperature of the steel tubes to be expanded can be selected and kept constant, and it can be displayed and recorded in real time, and the real time curve and historical curve of the heating parameters can be printed and saved.Provide guarantees for data traceability.
Pipe expanding machine can expand the type of steel pipe: seamless steel pipe, spiral welded pipe, straight seam welded pipe.Pipe varieties are: provide, alloy steel, stainless steel and so on.
1306-13013.
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