Alternating-loading hydraulic system

Abstract

The invention discloses a novel alternating-loading hydraulic system, which comprises an oil tank, an oil pump, a check valve, a pressure meter, a proportional overflow valve, a reversing valve, a pressure sensor, an oil cylinder, a balance valve and a pipeline. When the oil cylinder acts on a workpiece, the proportional overflow valve is used for inputting an alternating control signal, so that the hydraulic system generates corresponding alternating oil pressure; the alternating oil pressure acts on an upper cavity of the oil cylinder, and alternating acting force is applied to the workpiece by the oil cylinder by virtue of a piston rod; and the oil cylinder can be used for changing the amplitude value, the mean value and the frequency of the acting force which acts on the workpiece by changing the amplitude value, the mean value and the frequency of the alternating signal input by the proportional overflow valve, so that the purpose of realizing controllable alternating-loading to the workpiece is realized. The alternating-loading hydraulic system can be extensively applied to a board long-stroke vibratory drawing device, a vibratory residual stress relieving device and the like, and is capable of greatly reducing the energy consumption in a working process, reducing the vibration and the impact of the alternating load to a rack of equipment, and prolonging the service life of the equipment.

Description

Technical field [0001] The invention relates to an alternating loading hydraulic system, in particular to an alternating loading hydraulic system used for a vibration deep drawing device and a vibration elimination residual stress device. Background technique [0002] At present, in the deep drawing process of sheet metal, it is generally necessary to adopt a multi-pass drawing method for long stroke drawing. In order to improve the processing efficiency, there is a kind of drawing which adds vibration during the drawing process. Method, through the additional vibration of the deep drawing cylinder, the deformation stress in the drawing process of the workpiece is eliminated, and a single long stroke drawing is realized. The additional vibration in the existing vibration drawing technology depends on the electric power used in the hydraulic system. The high-frequency reversing of hydraulic servo valves, proportional reversing valves, etc., drives the acting cylinder to produce hi...

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Problems solved by technology

[0002] At present, in the process of sheet metal deep drawing and forming, for long-stroke deep drawing, it is generally necessary to use multi-pass deep drawing methods. In order to improve processing efficiency, there is currently a deep drawing process that adds vibration during the deep drawing process. method, through the additional vibration of the drawing cylinder, the deformation stress in the drawing process of the workpiece is eliminated, and a single long-stroke drawing is realized. The additional vibration in the existing vibration drawing technology depends on the electric power used in the hydraulic system. The high-frequency reversing of valves such as hydraulic servo valves and proportional directional valves, the driving cylinder produces high-frequency reciprocating motion, and the workpiece is alternately loaded to achieve this. This alternating loading method requires the acting cylinder to overcome the cylinder piston, piston rod, The weight of the moving template and the moving mold of the equipment produces high-frequency reciprocating motion to achieve alternating loading. This working method will generate a huge energy consumption

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