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The purpose and requirements of hydraulic piston rod conditioning
Apr 27, 2018

As we all know, the hydraulic cylinder is an important actuator in the hydraulic system of modern construction machinery and plays an important role. As an important part of the hydraulic piston rod quality will also affect the performance and working conditions of the hydraulic cylinder. Therefore, the requirements on the machining and production of hydraulic piston rods are relatively strict.


Under normal circumstances, in order to meet the operating requirements of the hydraulic cylinder, the hydraulic piston rod used should have at least the ability to withstand greater tensile stress. In other words, it must have sufficient strength, stiffness, and toughness, and at the same time, it is easy to produce wear due to abrasion by the abrasive particles during use, and must also have high wear resistance. Usually in the production and production, is the use of 45 steel manufacturing, the processing route is: forging materials (rolling) - cutting - conditioning - straightening - machining - surface hardening, tempering - straightening - head Welding - machining - grinding - stress relief annealing - polishing - hard chromium plating - polishing - cleaning - assembly.


From the above processing process analysis, in the process of manufacturing hydraulic piston rod, the quenching and tempering process is also an important link. The reason why the quenching and tempering treatment is to be carried out is mainly to make the piston rod have a comprehensive mechanical property of good matching of strength, hardness, plasticity, and toughness, and the internal structure is a uniform and fine tempered sorbite body, which is organized for subsequent surface quenching. ready.


It should be noted that when the hydraulic piston rod is subjected to quenching and tempering, the process parameters must be properly controlled. It is usually mounted on a furnace in a well-type furnace. The quenching heating temperature is 830±10°C. After heat preservation for 160 minutes, it is quenched twice and quenched twice. Each time quenched, it is cooled by circulating cooling water and oscillated up and down during quenching. In order to ensure maximum cooling uniformity, cooling to 100 °C (shaft steam but no bubbling) out of the water into the pit tempering furnace.


In addition, during the quenching process, in order to reduce the deformation and further improve the quality of the hydraulic piston rod, a certain amount of quenching additives can be added to achieve the goal. When quenching, the circulating water pump is also used to force the cooling liquid to circulate.http://www.xhychromerod.com/