A Synchronous Control Method for Hydraulic Cylinders of Six-sided Top Press

Abstract

The invention discloses a synchronous control method for a hydraulic oil cylinder of a six-sided top press. First, the working oil cylinder is returned, a synthetic block is placed, air-feeded and paused, and then the reciprocating supercharger enters an equal-capacity conversion mode for synchronous liquid filling, and then the reciprocating booster The supercharger enters the overpressure mode of constant capacity and supercharging ratio for synchronous overpressure, and finally maintains and releases the pressure. During the liquid filling process, the high and low pressure oil output from the reciprocating supercharger is simultaneously injected into the working cylinder with high precision and quantitatively. The piston of the oil cylinder moves quickly and accurately. During the process of overpressure, the piston of the reciprocating supercharger swings left and right, so that the reciprocating supercharged oil continuously flows into the corresponding working cylinder for overpressure; the invention can ensure the synchronous displacement control of six-cylinder equal-volume oil supply Accuracy, so that the synchronous control accuracy reaches 0.1mm ~ 0.2mm, the reciprocating supercharger can also be used as an ultra-high pressure oil source to load the working cylinder to a working pressure of 120MPa, and the invention can also achieve precise control in the process of filling liquid and overpressure Six-cylinder synchronous displacement.

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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