Water press large-pressure instant load-missing control method

Abstract

The invention discloses a method for controlling the high-pressure instantaneous loss of load of a hydraulic press, and relates to major free-forging hydraulic press equipment. The hydraulic press comprises a master cylinder, a master cylinder control valve (a proportional valve), a movable beam, a return cylinder, a return cylinder low-pressure water control valve, a return cylinder high-pressure water control valve, a programmable controller, an execution control element (an amplifier), a displacement sensor, a pipeline, etc. The method for controlling the high-pressure instantaneous loss of load of the hydraulic press is a hydraulic buffer cushion method, which is characterized in that when the hydraulic press encounters high-pressure instantaneous loss of load, the return cylinder is controlled to access high-pressure water, causing the return cylinder and the pipeline to form a hydraulic buffer cushion, so as to buffer and depressurize the movable beam, absorb residual energy and realize smooth unloading. The method effectively eliminates the intensive violation of the hydraulic press and the pipeline when punching is completed, improves the precision of punched holes in forged pieces, basically eliminates the need of oxygen blast treatment for burrs, enables direct forging of hole stretching and slash, saves energy and improves production efficiency.

Description

Technical field [0001] The instantaneous load-loss control method of a hydraulic press under high pressure according to the present invention relates to a super large free forging hydraulic press equipment. Background technique [0002] Punching is one of the forging processes of cylindrical parts. At present, the traditional hydraulic press cannot effectively control the forging and punching process. At the end of punching, the hydraulic press will suddenly lose load and cause shocks. The press and pipeline will vibrate strongly, which affects the life and reliability of the hydraulic press. At the same time, burrs are generated on the edge of the hole, which must be treated with oxygen blowing. This process reduces the temperature of the forging, and needs to be returned to the furnace for reheating, increasing the number of fires, low production efficiency and increased energy consumption. In view of the above-mentioned problems in the prior art, it is very necessary to study ...

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