A Local Loading Hydraulic Servo Control System for Hydraulic Press

Abstract

The invention discloses a local loading hydraulic machine hydraulic servo control system. The local loading hydraulic machine hydraulic servo control system comprises a low-pressure large-flow pump set and a high-pressure small-flow pump set which are connected with oil inlets of a work condition switching valve. Two oil outlets of the work condition switching valve are connected with an oil inletof a first proportional valve or a servo valve and an oil inlet of a second proportional valve or the servo valve correspondingly. One oil outlet of the first proportional valve or the servo motor isconnected with a rodless cavity of a first loading oil cylinder and a rodless cavity of a third loading oil cylinder, and the other oil outlet is connected with a rod cavity of the first loading oilcylinder and a rod cavity of the third loading oil cylinder. The first loading oil cylinder is connected with the third loading oil cylinder through a movable cross beam. The two oil outlets of a second proportional valve or the servo valve are connected with a rodless cavity and a rod cavity of a second loading oil cylinder correspondingly. The loading oil cylinders are provided with pressure sensors, force sensors and displacement sensors. The loading oil cylinders can output corresponding displacement or pressure or output force through a controller. By means of the local loading hydraulicmachine hydraulic servo control system, multiple times of local loading is achieved after one-time heating of the workpiece, and the overall loading forming capability is larger than that under the same installed powder.

Description

Technical field [0001] The invention belongs to the technical field of hydraulic presses, and particularly relates to a hydraulic servo control system of a partially loaded hydraulic press. Background technique [0002] In die forging technology, the upper die of the die is generally installed on the upper slider, and the whole is moved down during the working process, so as to realize the pressure forming of the forging. However, since the entire upper die is loaded at the same time during the loading process, a larger tonnage press is required to form the forging when pressing large forgings, which limits the forming and processing capacity of large forgings. [0003] At present, the usual double-acting hydraulic press is basically composed of two parts of hydraulic system. The main hydraulic system is responsible for the pressure loading of the main cylinder and provides the main forming force. The auxiliary hydraulic system is responsible for blanking the workpiece. The output ...

AI Technical Summary

Problems solved by technology

[0004] In the process of partial loading and forming of large forgings, mold adjustment is generally required, and auxiliary tooling is required to perform auxiliary work to realize the forming of forgings. During forming, it takes a long time to replace molds and heat insulation, and it will Causes great waste of blank parts and affects the microstructure and properties of forgings

Therefore, the use of two local loading steps at a time will greatly limit the application of local loading forming in the forming process of large and complex forgings.

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