Abstract
In the extrusion machine with double booster cylinder hydraulic system, the stability of the extrusion velocity is affected because of the switching process of the two booster cylinders in the hydraulic system. In this paper, the analytical solution of the extrusion velocity fluctuation caused by the double booster cylinder hydraulic system is derived. Firstly, the model of the double booster cylinder hydraulic system was established, and the switching process of the two booster cylinders was studied under the condition of high pressure and high flow. Secondly, the traditional control method cannot obtain stable extrusion velocity under the condition of high pressure and high flow rate, and the new control method was proposed to significantly reduce the fluctuation of extrusion velocity. Thirdly, the fluctuation of extrusion velocity caused by the booster system was derived and the influence of the parameters of the hydraulic components such as the hydraulic cylinder and the hydraulic valve and the working conditions such as the flow rate and the pressure on the fluctuation of extrusion velocity was analyzed. Finally, based on the AMESIM software, the double booster cylinder hydraulic system of the 35 MN extrusion machine was simulated and analyzed. The numerical simulation results were used to verify the analytical solution of extrusion velocity fluctuation. The analytical solution can be applied to the engineering design of the hydraulic system and more in-depth optimization analysis.
Highlights
E use of two booster cylinders for continuous boosting can ensure that the deceleration and reset phase of one booster cylinder piston is just the acceleration and uniform motion phase of the other booster cylinder piston, which eliminates the flow fluctuations of the booster system [9, 10]
A mathematical model of the double booster cylinder hydraulic system is established, and the switching process of the booster cylinders under high pressure and high flow condition is studied in detail. e expression of the extrusion velocity fluctuation caused by the booster system under the condition was derived, and the analytical solution of the extrusion velocity fluctuation was verified by numerical analysis results
The mathematical model of the double booster cylinder hydraulic system is established, and the switching process of the booster cylinders is studied by two methods of theoretical derivation and numerical simulation. e conclusion is as follows
Summary
Under the condition of high pressure and low flow, the switch process of the booster cylinder is controlled by giving the slope signals corresponding to two flow valves. is control method makes the deceleration stage of one booster piston just the acceleration stage of the other, and the sum of the velocity of the two pistons is constant. e output flow of the booster cylinders can be superposed so as to reduce the output flow fluctuation during the switching process of the two booster cylinders and make the extrusion velocity more stable. After a period of time, the pressure in the rod chamber of booster cylinder A is greater than that in the rodless chamber of the main cylinder, and the check valve at its outlet is opened At this time, the control signal r2 has been reduced to 0, and the booster cylinder B has been out of work. In view of the long time of oil compression in the rod chamber of the booster cylinder, the traditional control method of given the slope signal cannot meet the demand of high pressure and high flow system. Erefore, by using the control method of first oil compression and switching, a smaller velocity fluctuation can be obtained under high pressure and high flow conditions. Analytical Solution of Velocity Fluctuation e parameters that affect the extrusion velocity in the switching process are divided into three categories: the first
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