Production Process and Application of High Precision Cold Drawing Steel Pipe

High-precision cold drawn precision steel pipe is a new type of high-tech energy-saving product. The precision steel pipe produced by this technology has been widely used in domestic hydraulic and pneumatic cylinders, coal underground support (pillar), petroleum pump pipe, jack and other manufacturing fields. The promotion and application of high-precision cold drawn precision steel tubes is of great significance for saving steel, improving processing efficiency, saving energy, and reducing investment in hydraulic cylinders and cylinder processing equipment.

Cold drawing method: production of high-precision cold drawn pipe - hydraulic cylinder body compared with the traditional cutting process, has the following characteristics:

1. High production efficiency: It takes 154 hours to produce a cylinder tube with an inner diameter of 420 mm and a length of 12 meters by a conventional method, and it takes only 4 minutes to produce by cold drawing.(2) High genuine rate: Because the rolling head of the boring head also plays a guiding role, during the cutting process, the blank tube is deflected due to its own weight, causing the rolling head and the boring tool to be biased, resulting in waste. The authentic rate can only reach about 60%, and the cold drawing method can produce more than 95%.(3) High metal utilization rate: the cylinder is manufactured by the traditional boring method, and the metal utilization rate is only 50-70%. When produced by the drawing method, the metal is not only cut into iron, but can be extended by 30%, and the metal utilization rate can reach 95%.(4) It can improve the mechanical properties of the finished pipe metal: it can be produced by drawing method, so that the blank can be plastically deformed by more than 30%, and the strength limit of the finished pipe metal is greatly improved due to work hardening. Generally, the strength limit of the inner layer of the finished pipe is increased by 60%. The high-precision cold-drawn tube is made of seamless steel pipe and straight-slot welded pipe as a blank. After chemical treatment, it is drawn on a special cold drawing machine through a special deformation principle to produce a high-precision pipe. Its dimensional accuracy is H10?H8, the straightness is 0.35?0.5mm/m, and the surface roughness is Ra1.6-0.4.

The production process is as follows:Feeding - visual inspection - mechanical cleaning - mechanical cleaning - annealing - straightening - tube processing - pickling - neutralization - washing - scaling - saponification - drawing - Inspection - cutting ruler - honing - end processing - straightening - final assembly - pressure test - packing

application:(1) Engineering hydraulic machinery: such as hydraulic car cranes, excavators, bulldozers, forklifts, etc.(2) Coal mine underground hydraulic support: At present, there are 48 enterprises producing underground hydraulic support in the country, and the total demand for high-precision cold-drawn pipes is about 1.2 million meters.(3) Hydropower station gate hoist and formwork machine, especially the Yangtze River Three Gorges Project, will have great demand in the next decade.(4) Construction machinery: Lifting machinery for aerial work, construction and repair of general buildings are also inseparable from hydraulic machinery.(5) Petroleum geological management: Each oil field in the country needs more than 30,000 oil pump per year, and the annual consumption of high-precision pipes is more than 20-40 million meters. In addition, this technology can be used to refine various types of drill pipes.(6) Weapon industry: The military industry now processes the gun barrel by spinning method. The spinning method has low productivity and high cost, and it is more suitable to produce by cold drawing.(7) Bearing industry: At present, the production of rolling bearing races is made of round steel and is made by stamping. Large bearing races are also made of hollow bars, and the metal utilization rate is less than 40%. High-precision, bearing steel thick-walled pipes are urgently needed.(8) Automobile industry: In the past 95 years, the precision shaft of the transmission shaft is 6000 tons, the semi-axle casing is 10,000 tons and various oil pipelines.(9) Aviation industry: aluminum alloy aircraft landing gear tubes and thick-walled steel tubes.(10) Jack industry: China's jack manufacturing has considerable strength, and the prospect of foreign exchange earning is considerable. At present, all the production enterprises use solid bar material processing, which has low production efficiency and high material waste. The demand for high-precision cold drawing tube is urgent.(11) Other fields: all kinds of printing and dyeing rollers, rollers for roller rollers, stainless steel tubes, aluminum tubes, copper tubes, shaped tubes and internal and external composite tubes can be produced by this technology.

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