Bending machine fully closed loop electro-hydraulic servo drive method and system

Abstract

The invention relates to a bending machine full closed loop electro-hydraulic servo drive method and system. The method comprises the steps that an actual motion position of a bending mechanism is monitored by a grating ruler during the reciprocating motion of the bending mechanism positioned on a bending machine; a driver drives a servo motor to rotate according to a speed adjusting curve of theservo motor and the actual motion position; the servo motor drives a hydraulic pump to rotate; the hydraulic pump drives a hydraulic cylinder to reciprocate; and the hydraulic cylinder drives the bending mechanism to reciprocate. According to the bending machine full closed loop electro-hydraulic servo drive method and system, the actual motion position of full closed loop monitoring of the bending mechanism in the reciprocating motion process is realized, the control precision of the rotating speed of the servo motor is improved, the tail end of the bending mechanism can be prevented from shaking, so that the drive efficiency of the bending machine is improved, the bending processing precision of products to be bent is effectively ensured, and thus the yield of the products to be bent isensured.

Description

Technical field [0001] The present invention relates to the technical field of fully closed loop electro-hydraulic servo control, in particular to a fully closed loop electro-hydraulic servo drive method and system of a bending machine. Background technique [0002] At present, in the bending process of products to be bent (such as thin metal plates), most of the following three methods are used to drive the reciprocating movement of the bending mechanism set on the bending machine tool: (1) Hydraulic proportional valve and hydraulic valve , The flow of hydraulic oil is controlled by hydraulic proportional valve and the flow direction of hydraulic oil is controlled by hydraulic valve. Hydraulic oil is used as the power source to drive the reciprocating movement of the bending mechanism; (2) Synchronous servo motor cooperates with servo pump to control the speed of servo motor The hydraulic oil flow rate of the servo pump is proportional to the hydraulic oil flow rate. The hydraul...

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Problems solved by technology

[0003] The above three methods of driving the reciprocating motion of the bending mechanism are all bending a product to be bent during the movement process of the bending mechanism from the starting point to the target point, and during the movement process from the target point back to the starting point, the bending The bending machine is preparing for the next product to be bent, and the bending mechanism completes a reciprocating motion. However, during the reciprocating motion of the bending mechanism, there is a lack of full-closed-loop monitoring of the actual movement position of the bending mechanism, and it is difficult to use the actual movement position to accurately control the bending mechanism.

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