Synchronous control method for six-surface jacking press hydraulic oil cylinder

Abstract

The invention discloses a synchronous control method for a six-surface jacking press hydraulic oil cylinder. The method comprises the following steps that firstly, return stroke of working oil cylinders, placement of a composite block, idling and pausing are carried out, then a reciprocating supercharger enters an equal-capacity conversion mode for synchronous liquid injecting the reciprocating supercharger enters a constant volume and pressurization ratio overpressure mode for synchronous overpressure, and finally pressure maintaining and pressure relief are carried out; in the liquid injecting process, high and low pressure outlet oil of the reciprocating supercharger is simultaneously and quantitatively injected into the working oil cylinders so that pistons of the oil cylinders can move quickly and accurately; and in the overpressure process, a piston of the reciprocating supercharger swings left and right, so that the reciprocating pressurized oil continuously is flown into the corresponding working oil cylinders for overpressure. According to the method, the synchronous displacement control precision of six-cylinder equal-volume oil supply is guaranteed, and the synchronous control precision can reaches 0.1 mm-0.2 mm, and meanwhile the reciprocating supercharger can also serve as an ultrahigh-pressure oil source so that the working oil cylinders can be loaded to the working pressure of 120 MPa; and in addition, the six-cylinder synchronous displacement can be accurately controlled in the liquid injecting and overpressure processes.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a method for synchronously controlling a hydraulic oil cylinder of a six-sided press. Background technique [0002] The six-sided top press is the main equipment for synthetic diamond synthesis in my country. Its working principle is: six working oil cylinders are opposite to each other on the three coordinate axes of XZY, and high-pressure oil is introduced from six directions to pressurize the center of the host machine. Push the piston forward to generate ultra-high pressure on the front end of the piston. Under the action of the hard alloy anvil in the center of the host machine, the production raw material block forms a sealed cubic ultra-high pressure chamber, which provides high-pressure conditions for synthetic diamond synthesis. During the pressurization process, the position accuracy of the press piston to the movement of the three coordinate centers has a deci...

AI Technical Summary

Problems solved by technology

At present, there are many traditional six-sided press hydraulic systems such as figure 1 As shown, the electro-hydraulic control system is used to control various components in the hydraulic system, and the speed of the six working cylinders from the throttle valve 23 to the throttle valve 28 is used to adjust the speed of the six working cylinders from the working cylinder 3 to the working cylinder 8. Matching and synchronization accuracy requirements for oil cylinders, the existing problem is that there is no uniform standard for the adjustment process of the six fixed throttle valves, and manual adjustments are all based on experience, and are affected by fluctuations in oil temperature and compression deformation resistance of raw material blocks during work. The repetition accuracy of the synchronous displacement of the six working oil cylinders changes greatly, and the displacement speed of the six cylinders can only be adjusted and controlled during the liquid filling process of the press. In the overpressure section of 10~120MPa, the high pressure oil does not pass through the throttle valve 23 to the throttle. Flow valve 28, unable to adjust synchronous motion

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