Electro-hydraulic control pressure machinery with function of return pressure maintenance

Abstract

The invention discloses an electrohydraulically-controlled pressure machine with a return stroke pressure retaining function. The electrohydraulically-controlled pressure machine with the return stroke pressure retaining function comprises an executing mechanism and a hydraulic control mechanism, wherein the hydraulic control mechanism comprises a first hydraulic pipe, a second hydraulic pipe, a third hydraulic pipe, a pressure reducing valve, a first control unit, a pressurizing mechanism, a second control unit, a magnetic force control mechanism and a return stroke pressure retaining mechanism. Through matching of the pressurizing mechanism and the magnetic force control mechanism in the hydraulic control mechanism, when a stamping rod enters a third stroke section to cause elastoplastic deformation of a workpiece, the pressure increases ceaselessly, so that a requirement on a gradually increasing pressure during the elastoplastic deformation of the workpiece is met, and thus the stamped workpiece has relatively good stiffness. The return stroke pressure retaining mechanism is arranged on an oil returning pipe of the hydraulic control mechanism, the return stroke pressure retaining mechanism endows a right chamber with a certain pressure, and the pressure enables the returning speed of the stamping rod stable, so that the stamping rod does not impact an executing oil cylinder in a return stroke.

Description

technical field [0001] The invention relates to the technical field of electro-hydraulic control, in particular to an electro-hydraulic control pressure machine with return pressure maintaining function. Background technique [0002] In the prior art, two types of power are usually used for stamping workpieces. One is to use mechanical transmission as the power, that is, mechanical power; the other is to use hydraulic transmission as the power, that is, hydraulic power. Generally, when the deformation of the workpiece is reduced, the elastic-plastic modulus of the workpiece is small, and the pressure required for the deformation of the workpiece is small, it is more appropriate to use mechanical power, because the mechanical power makes the stamping action of the stamping rod faster. When the deformation of the workpiece is large, and the elastic-plastic modulus of the workpiece is large, and the pressure required for the deformation of the workpiece is large, it is more app...

AI Technical Summary

Problems solved by technology

[0007] 1. The return stroke control of the stamping rod is complicated, and the return stroke response is not more sensitive

[0008] 2. When the stamping rod returns, the return speed is unstable, resulting in different return times each time

[0009] 3. The feed speed of the first stage and the second stage of the stamping rod is unstable, and the response to pressure changes is slow

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