cold drawn precision steel pipes

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I. Introduction precision cold drawn precision steel tubes is a new high-tech energy-saving products. In recent years, the use of this technology in the production of precision steel has been widely used in domestic hydraulic, pneumatic cylinders, coal mine bracket (pillars), oil pump pipe, jacks and other manufacturing fields. Precision cold drawn precision steel tubes for the promotion and application of steel conservation, improve processing efficiency, saving energy, reducing the hydraulic cylinder, the cylinder machining equipment investment is important. The technology in November 1991 through the Ministry of Metallurgy, Anhui Science and Technology Organization experts, in December 1992 through the Jiangsu Province Science and Technology Organization experts. The technology has been incorporated by the State Science Commission (93) made into a word NSC No. 500 issued a "national scientific and technological achievements to promote the Program" guide, No. I4-1-4-21.

 

Second, the product features refers to the so-called high-precision drawing, the outer diameter accuracy (tolerance) strict, internal and external surface finish, roundness, straightness good, uniform thickness precision steel pipe. The product was a little honing, it can be directly used as hydraulic, pneumatic cylinder cylinder tube. The traditional hydraulic, pneumatic cylinder body tube of the production process is the use of hot-rolled seamless steel pipe, using boring ─ ─ rolling joint cutting process, the production process, a lot of metal waste was cut into chips, but also consume a lot of power. With China's industrial and technological development, the hydraulic cylinder technology has been widely used, according to incomplete statistics, the country each year requires a variety of specifications of the hydraulic cylinder about 380 meters, follow the old technology production of hydraulic cylinders, has been difficult to adapt production development. Adopt new technologies, drawing way to produce high-precision drawing ─ ─ hydraulic cylinder compared with the traditional cutting process has the following characteristics:

 

 (1) high production efficiency: the traditional way of producing a 420 mm diameter, 12 m long cylinder required 154 hours, with the drawing method to produce just four minutes.

 

(2) High rate: As boring rolling head and play the leading role, in the cutting process, the blank tube deflection generated due weight, resulting in rolling head and boring astray, resulting in waste. Genuine rate can only reach about 60%, while the method of producing cold drawn, genuine rate of 95% or more.

 

 (3) Metal utilization: the traditional method of manufacturing the cylinder bore of the metal utilization rate of only 50-70%. Produced a drawing method, the metal is not only cut into the end of iron, but can be an extension of 30%, a metal utilization of 95%.

 

 (4) to improve the mechanical properties of the finished metal tube: a drawing produced by the method, the blank to obtain more than 30% of the plastic deformation, the hardening strength of the metal leaving the finished tube limit greatly improved. Usually in the finished tube inner strength limit by up to 60%. Precision cold drawn seamless tube is rolled steel pipe, welded pipe for the blank, after chemical treatment in special drawing machine, through the special design of the mold deformation theory for drawing, producing precision tube. Its dimensional accuracy of H10 ~ H8, straightness of 0.35 ~ 0.5mm / m, the surface roughness of Ra1.6-0.4. Production process is as follows: Feed - visual inspection - mechanical cleaning - mechanical cleaning - Annealing - straightening - tube head machining - pickling - and in - washing - squamous metaplasia - saponification - - drawing - check - Cut length - Honing - end machining - straightening - assembly - pressure test - packing

 

Third, technical indicators produced by the technology of high-precision cold drawn tube main technical indicators have reached or exceeded the national standard part GB8713 - 88 and international standards ISO4394/I-1980 (E) requirements. The table below: The main technical indicators and standard control menu items actually reach GB8713-88 ISO4394 / I diameter tolerance H8 H9 H10 H8 H9 H10 H8 H9 H10 straightness 0.3/1000 A: 0.3/1000 A: 0.5/1000 B: 1/1000 B: 1/1000 C: 1.5/1000 C: 1.5/1000 5% of wall thickness deviation # 177 # 177 # 177 10% 10% wall thickness of 0.04 no requirement of roundness No provisions

 

 

Fourth, product development, the use of "high-precision cold drawn steel technology" cold drawn precision steel post can be directly used pneumatic cylinder (Yantai, Qingdao, Zhaoqing and other domestic plants have been widely used pneumatic components). According to the special requirements of hydraulic cylinders, honing machine can be equipped with domestic phosphate layer was removed and cold drawn tubes to improve the accuracy, honing amount generally only 0.2mm. This pipe is Xuzhou Xuzhou Construction Machinery Group uses large quantities of hydraulic Factory production of hydraulic cylinders (in 1998 spent more than 1000 tons) and with their host into the international market. Using this technology successfully developed oil pump (1200mm hard piston, 6300mm stroke) bobbin, replace similar imported pipe, Dagang Oilfield, Dagang by Petroleum Machinery Factory (850 tons / 1998) for the introduction of technology from the United States and key equipment built API for the entire tube pump production line, and its products meet ASTM-A513-84a standards. Since 1989, the use of this technology in enterprises has sent large quantities of domestic coal machinery factory provides high-precision drawing 27SiMn precision steel pipes.and cold drawn precision steel pipes