Process and application of high precision cold drawn steel pipe

    High-precision cold drawn steel pipe is a new type of high-tech energy-saving products. In recent years, the use of this technology to produce precision steel pipe has been widely used in domestic hydraulic, pneumatic cylinder, coal downhole stent (pillar), oil pump tube, jack and other manufacturing areas. High-precision cold drawn precision steel pipe to promote the use of saving steel, improve processing efficiency, energy conservation, reduce the hydraulic cylinder, cylinder processing equipment investment is important.

    Cold-drawn way: the production of high-precision cold-drawn tube ─ ─ hydraulic cylinder compared with the traditional cutting process, has the following characteristics:

    (1) High production efficiency: the traditional way to produce a diameter of 420 mm, 12 meters long cylinder to be 154 hours, with cold drawing method to produce only 4 minutes.

    (2) The high rate of genuine: the boring of the rolling head and play a guiding role in the cutting process, the blank tube due to self-weight deflection, resulting in rolling head and boring tool deviation, resulting in waste. Genuine rate can only reach about 60%, while the cold-drawn method of production, genuine rate of up to 95% or more.

    (3) High metal utilization: the traditional boring method of manufacturing cylinder, metal utilization rate of only 50-70%. With the drawing method of production, the metal not only is not cut into iron, but can get 30% extension, metal utilization up to 95%.

    (4) Improve the mechanical properties of finished pipe metal: the use of drawing method, so that the blank get more than 30% of the plastic deformation, due to hardening and processing of the finished tube metal strength limit greatly improved. Generally in the finished product tube strength limit increased by 60%.

    The production process is as follows: Feed - Appearance inspection - Mechanical cleaning - Mechanical cleaning - Annealing - Straightening - Pipe head processing - Pickling - Neutralization - Washing - Sizing - Saponification - - Pull - Check - Cut - Honing - End Machining - Straightening - Assembly - Pressure Test - Packing

    Application:

    (1) Engineering hydraulic machinery: such as hydraulic car hanging, excavators, bulldozers, forklifts and so on.

    (2) Coal mine hydraulic support: the current production of underground hydraulic support of the 48 companies, high-precision cold-drawn tube of the total demand of about 1.2 million meters.

    (3) Hydropower station gate hoist, template machine, especially the Yangtze River Three Gorges Project in the next decade a great demand.

    (4) Construction machinery: high-altitude operation of lifting machinery, general construction of the construction can not be separated from the hydraulic machinery.

    (5) Petroleum geological tube: the oil field of each year to pump more than 30,000 units, the annual consumption of high-precision tube 20-40 million meters, in addition to this technology can also be used to refine all kinds of drill pipe.

    (6) Weapons industry: the military sector is now using spinning method of processing guns, spinning method of low productivity and high cost, with cold drawing method is more appropriate production.

    (7) Bearing industry: the current production of rolling bearing ring to round steel as raw material, sliced after stamping made. Large bearing seat will also be hollow bar hollow to make, metal utilization rate of less than 40%, the urgent need for high precision, bearing steel thick-walled pipe.

    (8) The automotive industry: 95 years drive shaft with precision pipe 6,000 tons, 10,000 tons of casing and a variety of oil pipeline.

    (9) Aviation industry: aluminum alloy landing gear and thick-walled steel pipe.

    (10) Jack industry: China's jack manufacturing has considerable strength, export prospects. The production of enterprises at present the use of solid cylinder bar processing, low production efficiency, high material waste, the need for high-precision cold-drawn tube urgent.

    (11) Other areas: all kinds of printing and dyeing roller, roller roller with tube, stainless steel tube, aluminum tube, brass, shaped tube and inside and outside the composite pipe, etc. can be used to produce this technology.