High Precision Cold Drawn Steel Pipe Technology and Its Application

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 pipe, 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 method of production of an inner diameter of 420 mm, 12 meters long cylinder to be 154 hours, with cold drawing method of production only 4 minutes.
(2) 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 use of 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 is not only cut into iron, but can get 30% extension, metal utilization up to 95%.
(4) Improving the mechanical properties of finished metal pipe: the use of drawing method, so that the blank get more than 30% of the plastic deformation, due to hardening and processing of finished pipe metal strength limit greatly improved. Generally in the finished tube within the strength limit increased by 60%. High-precision cold-drawn tube is a seamless hot-rolled steel pipe, straight seam welded pipe for the blank, after chemical treatment in a special cold drawn machine, through the special deformation of the design of the mold to draw to produce high-precision tube. Its dimensional accuracy of H10 ~ H8, straightness of 0.35 ~ 0.5mm / m, surface roughness of Ra1.6-0.4.

The production process is as follows: feed - appearance inspection - mechanical cleaning - annealing - straightening - pipe head processing - pickling - neutralization - washing - sizing - saponification - drawing - inspection - cutting foot - honing - end machining - straightening - assembly - test pressure - packing