Abstract
Compressibility of hydraulic oil is very significant for large diameter cylinder presses, especially if they are exposed to high pressures. The paper presents a theoretical analysis of the process of compression and decompression of oil in the cylinders with and without the presence of air presenting an analog model. Although considerations are relating to the ideal conditions of the process of compaction, the paper defines the basic mathematical processes depending on compression and discharge of the same. They refer to the definition of the time discharge and elimination of adverse effects in the same.
Highlights
Discharge the working chambers of the cylinder, exposed to pressure and is followed by the rapidly expanding elastically deformed mass of oil
With the cylinder of large diameter and high-pressure pressing, takes place unchecked, it leads to hydraulic shock and oscillatory movement of the cylinder’s piston with a supporting tool, which is accompanied by strikes
In order to avoid these undesirable effects the excess of compressed oil must take controlled using the appropriate nozzle diameter. Those ones, must be selected to provide an optimal conducting process: if the diameter of the nozzle was too small the time of the removal of excess fluid would be too long, and if the diameter of the nozzle was too big cannot be avoided, the above mentioned harmful effects of process of the decompression hydraulic oil
Summary
Discharge the working chambers of the cylinder, exposed to pressure and is followed by the rapidly expanding elastically deformed mass of oil. Those ones, must be selected to provide an optimal conducting process: if the diameter of the nozzle was too small the time of the removal of excess fluid would be too long (which would increase the duration of the technological cycle), and if the diameter of the nozzle was too big cannot be avoided, the above mentioned harmful effects of process of the decompression hydraulic oil To solve these problems in the scientific literature has little practical information while solving of this problem and nozzle selection is performed relying on experience. The paper analyzes the influence of compressibility modulus (via compression modulus) and the manner of its determining through secant and tangent modulus of the fluid (isentropic and isothermal) and the impact of air in the working fluid
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