Electrohydraulic control pressure machine with feeding pressurizing function and return pressure maintaining function

Abstract

The invention discloses an electrohydraulic control pressure machine with a feeding pressurizing function and a return pressure maintaining function. The machine comprises an execution mechanism and a hydraulic control mechanism; the hydraulic control mechanism comprises a first hydraulic pipeline, a second hydraulic pipeline, a third hydraulic pipeline, a pressure reduction valve, a first control unit, a pressurizing mechanism, a second control unit and a hydraulic buffer control mechanism; the pressurizing mechanism of the hydraulic control mechanism is matched with the hydraulic buffer control mechanism to enable a punching rod to enter a third stroke segment so as to enable a workpiece to have elasticoplastic deformation, and therefore the requirement of the workpiece for gradual pressure increasing during elasticoplastic deformation can be met; due to the fact that the hydraulic control mechanism enables the punching rod to meet changes of pressures of three stroke segments, the rigidity of the punched workpiece is good; a return pressure maintaining mechanism is arranged on an oil returning pipeline of the hydraulic control mechanism, and enables a right chamber to have certain pressure, the return speed of the punching rod is stable through the pressure, and during returning of the punching rod, an execution oil cylinder cannot be impacted.

Description

technical field [0001] The invention relates to the electromechanical field, in particular to an electro-hydraulic control pressure machine with a feed pressurizing function and a 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, ...

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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