| Introduction of steel tube expanding machine
The maximum diameter of steel tube that can be produced on the steel tube expanding machine is 426~529 mm. However, in the large periodic rolling mill, only the seamless steel tube below Φ660 mm can be obtained. Therefore, the method of expanding must be adopted to obtain the non-rough steel tube with larger diameter.At present, the main pipe expanding machines used in various countries are hot dialing and cross rolling.In West Germany, the United Kingdom, the Czech Republic, Sweden and the United States and other countries have oblique expansion pipe machine, in France, the United States, the United Kingdom, Italy and Venezuela and other countries have hot drawing pipe machine.The equipment of the cross rolling pipe expanding machine is more complex, and the steel pipe of the expanding diameter is easy to produce spiral strip, and the surface quality is poor.Therefore, although its productivity is relatively high, the hot dialing tube expanding machine is still mostly used in China, because the hot drawing mechanism is simple to build and easy to operate.
It is possible to expand Φ420 mm steel pipe to 720~950 mm on the hot drawing pipe expanding machine with 100 ton tension installed in the periodic rolling mill of Dalmine factory in Italy.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 steel tube expander 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.
Stroke and composition of pipe expanding machine
The total stroke of the pipe expanding machine is 10-14.5 meters. The loading and unloading mechanism of the pipe expanding machine adopts roller to drive the steel pipe forward to complete the feeding.The intermediate frequency power supply is installed at the front end of the pipe expander, and the intermediate frequency coil is placed on the intermediate frequency coil adjustment frame. The core die of the pipe expander is fixed, the original pipe is put in, the water pump and the intermediate frequency power supply are turned on, and the intermediate frequency power is adjusted to adjust the pipe core
Mold and tube heating.Then start the pipe making machine and you can officially expand the pipe.The intermediate frequency coil, compensating resonant capacitor, reactor and other components of the pipe expander need circulating water cooling.The electrical control part of the pipe expanding machine is installed in the electric control box. The travel switch is installed at both ends of the pipe expanding machine travel. After the push plate moves in place, it will stop automatically.
Special equipment for steel tube hot hole enlargement, mainly for domestic large diameter steel pipe production cannot meet the demand of market and all kinds of steel pipe specification is not complete, meet the needs of small batch more varieties of steel pipe production, can satisfy the different material steel pipe hole enlargement and various non-standard steel tube expanding needs, is currently the main production process of large diameter steel pipe.It has been widely used in military industry, power plant construction, aerospace industry and Marine industry equipment manufacturing, and has made a great contribution to the national steel pipe industry and energy construction.
The equipment is used in the production of thermal expansion of seamless steel pipe, straight seam welded pipe, coil pipe and so on.Can expand the variety of steel pipe: all kinds of carbon steel, alloy steel, stainless steel and so on.
The pipe expanding equipment mainly includes: machine base, main cylinder support plate (including main cylinder), movable push plate, front support plate, automatic feeding mechanism, discharging roller table, mold support, intermediate frequency coil adjusting frame (including intermediate frequency heating coil), intermediate frequency power supply, electrical control system, etc
1805-19015.
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