2023-03-20 The development of honing cylinder tubes should start from the early days of the founding of the People's Republic of China. Our country cannot produce seamless steel tubes, let alone honed seamless steel tubes - cylinder tubes!At that time, there was a lack of machinery and technology, and it was impossible to produce seamless steel pipes from round steel.Mainly rely on imported capillary.Although before the founding of New China, the Japanese invaders built a hot-rolled seamless steel pipe factory in Anshan, Northeast China in 1935. After Japan surrendered in 1945, all its equipment was dismantled by the Soviet Union and transported to Ural No. 1 Steel Pipe Factory in Ukraine.Therefore, when the People's Republic of China was founded, China could not produce seamless steel pipes.In order to change the current situation of relying on imports, in August 1952, the first key industrial construction project of New China, Anshan Iron and Steel 'Three Major Projects' seamless steel pipe project was launched.In recent years, after reform and development, my country's hydraulic industry enterprises have provided a large number of hydraulic systems for national key projects and major technical equipment. Most of the hydraulic systems use honing seamless steel tube cylinders.
Read More 2023-03-20 Through rolling forming, a cold work hardening layer is formed on the rolling surface, which reduces the elastic-plastic deformation of the contact surface of the grinding pair, improves the wear resistance of the inner wall of the quilted tube, and avoids grinding burns.After rolling, the reduction in surface roughness can improve matching properties.Rolling is a chip-free machining that uses the plastic deformation of metal at room temperature to flatten microscopic irregularities in the surface of the workpiece, thereby changing the surface structure, mechanical properties, shape and size.Therefore, this method can achieve the two purposes of finishing and strengthening at the same time, which cannot be achieved by grinding.Regardless of the processing method used, small and uneven tool marks will be left on the surface of the part, resulting in interlaced peaks and valleys.The principle of rolling processing is to use the cold plasticity characteristics of metal at room temperature, apply a certain pressure on the surface of the workpiece with rolling tools, so that the metal on the surface of the workpiece will flow plastically, and the pressure finishing will be filled into the original remaining low groove. process, reducing the surface roughness of the workpiece.due to rolling
Read More 2023-03-20 The cold processing of pipes by rolling and drawing at room temperature on the cold-rolled and cold-drawn pipe unit belongs to the deep processing of hot-rolled pipes (including hot-extruded pipes) and welded pipes.It can obtain pipes with smaller diameter, thinner wall thickness, higher dimensional accuracy, lower surface roughness and better performance, as well as various cross-sectional shapes.Various pipes with a diameter of 0.2-765mm and a wall thickness of 0.015-50mm can be produced by cold drawing.Various pipes with a diameter of 4-450mm and a wall thickness of 0.03-35mm can be produced by cold rolling.Compared with cold rolling, cold rolling has the advantages of large amount of deformation per pass, less processing passes, short production cycle and low metal consumption.The disadvantage is that it is difficult to manufacture tools and it is inconvenient to change specifications.Poor production flexibility, high equipment investment and complicated maintenance; due to the periodic rolling, the rolling time is long, the productivity is low, and the energy consumption is high.The advantages of cold drawing are high productivity, convenient specification change in production, and flexibility
Read More 2023-03-20 What are the main factors that cause the cylinder tube to crack?There are the following points: 1. Raw material selection: In order to save costs, some oil cylinder pipe manufacturers will choose round steel produced by small steel mills for processing, but the round steel produced by these small steel mills will have a large number of air bubbles and gas holes and other post-processing After that, it is easy to cause cracking.Procurement from manufacturers, certificate of reliable supply.2. The temperature control of heat treatment is not in place: small manufacturers do not have professional production experience and technology.Workers in the workshop cannot guarantee whether the heat treatment of the steel pipe is in place only by the heating temperature and duration. Heat treatment will affect the change of the mechanical properties of the steel pipe. Meet customer requirements performance indicators.
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