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What are the characteristics of high-precision cold drawn tubes produced by cold drawing?
High precision cold drawn tubeIt refers to precision steel pipes with strict inner and outer diameter dimensional accuracy (tolerance range), good inner and outer surface finish, roundness, and straightness, and uniform wall thickness. This product can be directly used as hydraulic and pneumatic cylinder block tubes after slight honing. The traditional production process of hydraulic and pneumatic cylinder block tubes is to use hot-rolled seamless steel pipes and adopt a boring-one-rolling combined cutting process. During the production process, a large amount of metal is cut into chips and wasted, and a large amount of electric energy is also consumed. With the development of my country's industrial technology, hydraulic cylinder technology has been widely used. According to incomplete statistics, the country needs about 3.8 million meters of hydraulic cylinder blocks of various specifications every year. It is difficult to use the old process technology to produce hydraulic cylinder blocks to meet the needs of production development.
Produced using new technology and cold drawing methodHigh precision cold drawn tube(Hydraulic cylinder block) Compared with traditional cutting technology, it 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 using the traditional method, but only 4 minutes using the cold drawing method.
(2) High authenticity rate: Since the rolling head of the boring hole also serves as a guide, during the cutting process, the blank tube deflects due to its own weight, causing the rolling head and boring tool to deviate, resulting in scrap. The authenticity rate can only reach about 60%, but when produced using the cold drawing method, the authenticity rate can reach more than 95%.
(3) High metal utilization rate: Using traditional boring methods to manufacture cylinder blocks, the metal utilization rate is only 50 to 70%. When produced by the drawing method, the metal is not cut into iron powder, but can be stretched by 30%, and the metal utilization rate can reach 95%.
(4) It can improve the mechanical properties of the finished pipe metal: it is produced by drawing method, so that the blank can obtain more than 30% plastic deformation, and the strength limit of the finished pipe metal is greatly improved due to work hardening. Generally, the inner strength limit of finished pipes is increased by up to 60%. High-precision cold-drawn pipes are made from seamless hot-rolled steel pipes and straight-seam welded pipes. After chemical treatment, they are drawn on a special cold drawing machine using a mold designed with a special deformation principle to produce high-precision pipes. The dimensional accuracy reaches H10~H8, the straightness reaches 0.35~0.5mm/m, and the surface roughness reaches Ra1.6~0.4.