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Development and Product Characteristics of High Precision Cold Drawn Soft Magnetic Alloy

In recent years, soft magnetic alloys produced using this technology have been widely used in domestic manufacturing fields such as hydraulic and pneumatic cylinders, coal underground supports (pillars), petroleum pump tubes, and jacks. The popularization and application of high-precision cold drawn soft magnetic alloys are of great significance for saving steel materials, improving processing efficiency, saving energy, and reducing investment in hydraulic cylinder and cylinder processing equipment. The technology was identified by experts from the Ministry of Metallurgy and the Anhui Science and Technology Commission in November 1991. In December 1992, it was identified by experts from the Jiangsu Provincial Science and Technology Commission. The technology was listed by the National Science and Technology Commission as the project guide for the National Key Scientific and Technological Outreach Promotion Project issued by State Department of Science and Technology (No. 500), No. I4-1-4-21.
Second, the product features The so-called high-precision cold-drawn tube refers to the inner and outer diameter accuracy (tolerance range) is strict, internal and external surface finish, roundness, straightness is good, uniform thickness of the soft magnetic alloy.
After a little grinding, the product can be directly used as a hydraulic, pneumatic cylinder block tube. The traditional production process of hydraulic and pneumatic cylinders and tubes is the use of hot-rolled seamless steel tubes and the use of boring-rolling combined cutting technology. During the production process, a large amount of metal is cut into chips and wasted. At the same time, it is also consumed. A lot of electricity. With the development of China's industrial technology, hydraulic cylinder technology has been widely used. According to incomplete statistics, each year the country needs a variety of specifications of about 3.8 million meters of hydraulic cylinders, the use of old technology to produce hydraulic cylinders, it is difficult to adapt The need for production development.
Produce high-precision soft-magnetic alloy cold-drawn tubes using new technologies and cold-drawing methods—Comparison of hydraulic cylinders with traditional cutting technologies, with the following characteristics:
(1) High production efficiency: It takes 154 hours to produce a cylinder with an inner diameter of 420 mm and a length of 12 meters using the traditional method, and it takes only 4 minutes to produce with a cold drawing method.
(2) High quality rate: Since the rolling head of the boring hole also serves as a guide, during the cutting process, the rough tube is subject to deflection due to its own weight, causing the rolling head and the boring knife to go off, resulting in waste products. The authenticity rate can only reach about 60%, and it can be produced by cold-drawing soft magnetic alloy method. The genuine rate can reach more than 95%.
(3) High metal utilization rate: The cylinder body 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 powder, but can be extended by 30%, and the metal utilization rate can reach 95%.
(4) It can improve the mechanical properties of the finished tube metal: It is produced by the drawing method, so that the blank is plastically deformed by more than 30%, and the strength of the metal of the finished tube is greatly increased due to the work hardening. In general, the strength limit of the inner layer of the finished tube is increased by 60%. High-precision cold-drawn tubes are made of seamless hot-rolled steel tubes and straight-welded tubes. After chemical treatment, they are drawn on special cold-drawing machines and designed by special deformation principles to produce high-precision tubes. The dimensional accuracy of H10 ~ H8, straightness of 0.35 ~ 0.5mm / m, surface roughness Ra1.6-0.4.
The production process is as follows: Feeding - Visual Inspection - Mechanical Cleaning - Mechanical Cleaning - Annealing - Straightening - Tube End Processing - Pickling - Neutralization - Washing - Scale - Saponification - - Drawing - Inspection - Cutting Rule - Honing - End Processing - Straightening - Assembly - Testing - Packing

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