(1) High production efficiency: the traditional method takes 154 hours to produce a cylinder with an inner diameter of 420 mm and a length of 12 meters, while the cold drawing method only takes 4 minutes.
(2) Good quality: Since the rolling head of the boring hole also plays a guiding role, during the cutting process, the deviation of the blank tube due to its own weight causes the deviation of the rolling head and the boring tool, resulting in waste products. The quality of high quality can only reach about 60%, while the quality of cold drawing can reach more than 95%.
(3) High metal utilization rate: when using the traditional boring method to manufacture the cylinder block, the metal utilization rate is only 50-70%. When the drawing method is used for production, the metal is not cut into iron powder, it can be extended by 30%, and the metal utilization rate can reach 95%.
(4) It can improve the mechanical properties of the finished steel pipe: it is produced by drawing method, so that the blank can obtain more than 30% plastic deformation, and after hardening, the strength limit of the finished steel pipe is greatly improved. Typically, the strength limit of the inner layer of the finished pipe is increased by 60%. High-precision cold-drawn pipes are composed of seamless hot-rolled steel pipes and straight seam welded pipes. After chemical treatment, it is drawn on a special cold drawing machine through a mold designed according to the special deformation principle to produce high-precision pipes. Its dimensional accuracy reaches H10~H8, straightness reaches 0.35~0.5mm/m, and surface roughness reaches ra1.6~0.4.
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