Fuzzy pid constant speed stroke control method for large tonnage fully automatic hydraulic fine blanking machine

Abstract

The invention relates to a method for controlling a constant speed travel of a large-tonnage full-automatic hydraulic fine blanking machine through fuzzy PID. The method comprises the following steps: a fuzzy predictor, a controller and a fine blanking machine are successively connected in series so as to form a feedback control system to control the constant speed travel of the fine blanking machine; the controller comprises a PID controller and a fuzzy controller, which are parallel to each other; a main loop is formed by either the PID controller, the fuzzy predictor and the fine blanking machine or the fuzzy controller, the fuzzy predictor and the fine blanking machine according to the selection condition of the controller; when the PID controller is selected as the controller, the feedback control system forms a fuzzy prediction PID control system; when the fuzzy controller is selected as the controller, the feedback control system forms a fuzzy prediction fuzzy control system. The method is used for realizing repeated accurate positioning of sliding blocks of the fine blanking machine, positioning accuracy of a top dead center is guaranteed, meanwhile, burrs of workpieces are eliminated, blanking noises are reduced, the vibration of a machine tool is small, and the mould life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of fine blanking machine control, and in particular relates to a fuzzy PID constant-speed stroke control method for a large-tonnage fully automatic hydraulic fine blanking machine. Background technique [0002] Fine blanking technology is a hybrid advanced metal forming process combining stamping and cold extrusion methods, which can obtain high-quality parts in one stamping process. Compared with the traditional cutting processing method, the fine blanking process for processing the same special-shaped parts can directly punch out products with minimal size and shape errors, high precision, smooth shear surface and good consistency with metal plates. , and the material consumption can be saved by 30-50%, and the production efficiency can be increased by 5-20 times or even higher. With the continuous and successful development of metal sheets suitable for fine blanking in recent years, there are more and mo...

AI Technical Summary

Problems solved by technology

[0007] For traditional fine blanking machine equipment, adopting PLC to realize simple constant speed stroke control has technical problems such as blanking force, blank holder force and back pressure cannot be accurately controlled in real time, the positioning accuracy of the top dead point cannot be guaranteed, and the vibration of the bed at the speed conversion point is large. , the object of the present invention is to provide a fuzzy PID constant speed stroke control method for a large-tonnage automatic hydraulic fine blanking machine, which is used to realize the repeated and accurate positioning of the slider, ensure the positioning accuracy of the upper dead point, eliminate the burr of the workpiece, and reduce the Punching noise, low vibration of the bed, prolonging the life of the mold

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