A hydraulic stretching pad for planetary roller screw driven by AC servo synchronous motor

Abstract

A hydraulic stretching pad driven by an AC servo synchronous motor with a planetary roller screw. The core mechanism for controlling the blank holder force is replaced by a valve core driven by an AC servo synchronous motor with higher precision and faster response speed. The structure is simple and compact, and the failure rate is low. The valve core structure design has buffer capacity, which can solve the problem of excessive blank holder force at the beginning of stamping, and protect the main valve core from being damaged. A pressure sensor is installed in the piston cavity. It is convenient to adjust the AC servo synchronous motor according to the real-time pressure, so as to complete the precise control of the valve core displacement, and then realize the precise control of the blank holder force, forming a closed-loop system as a whole; the AC servo synchronous motor drives the screw to rotate through deceleration, Then it is converted into linear motion of the spool through the planetary roller pair, and the displacement of the spool is controlled by an AC servo synchronous motor closed-loop, which can realize precise adjustment of the blank holder force.

Description

technical field [0001] The invention belongs to the technical field of stretching pads for presses, and in particular relates to a hydraulic stretching pad for driving a planetary roller screw driven by an AC servo synchronous motor. Background technique [0002] In production, during the sheet drawing process, it is often necessary to press the edge of the workpiece to prevent wrinkling. Spring or rubber blank-holding devices are often provided on small presses, and the blank-holding force provided by this blank-holding device cannot be too large and cannot be adjusted; in large or deep drawing, air cushions or hydraulic air cushions are often used. The traditional hydraulic air cushion uses a hydraulic cylinder as a support pad, and the entry and exit of hydraulic oil in the hydraulic cylinder is determined by the working valve stem controlled by air pressure. Use the air distribution valve to control the piston in the cylinder, thereby controlling the movement of the wor...

AI Technical Summary

Problems solved by technology

The structure of this hydraulic air cushion is complicated, and the manufacturing workload is large.

Moreover, it is difficult to precisely control the position of the valve stem controlled by air pressure, and it is impossible to quantitatively control the size of the valve opening, and it is also impossible to accurately control the size of the blank holder force.

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