Controllable nitrogen cylinder capable of achieving delayed return stroke

Abstract

The invention belongs to the technical field of metal stamping die production, and particularly relates to a controllable nitrogen cylinder capable of achieving delayed return stroke. Storage of high-pressure nitrogen and opening and closing and direction of high-pressure nitrogen flow are controlled through electric signals of electromagnetic valves, and the controllable nitrogen cylinder capable of achieving delayed return stroke is composed of two one-way valves, the three electromagnetic valves, a nitrogen cylinder body, an air storage cylinder and other devices. In the stamping forming process, during the return stroke of an upper die body of a die, after the upper die body and a workpiece reach a safe distance, a control signal is sent to the electromagnetic valves, and thus the return stroke of a piston of the controllable nitrogen cylinder is delayed. In this way, the collision damage of secondary deformation of a stamped part caused by the fact that a traditional common nitrogen cylinder cannot delay the return stroke is avoided.

Description

technical field [0001] The invention belongs to the technical field of metal stamping die production, and in particular relates to a controllable nitrogen cylinder for delayed return. Background technique [0002] Stamping dies are mainly used to produce large quantities of stamping parts in industrial production, and are an important part of the manufacturing industry. In the automotive industry, 60% to 75% of parts are manufactured using stamping dies. Among them, automotive cover parts are difficult to manufacture due to thin materials, large structural dimensions, high dimensional accuracy, and complex curved surfaces. Auto stamping parts A class of parts that are focused on. [0003] The drawing process of the cover in the mold usually goes through the following steps in sequence: the sheet is placed between the upper and lower molds, the edge is pressed, the sheet is in contact with the punch, the sheet is pulled in, pressed, the bottom dead center and Uninstall etc....

AI Technical Summary

Problems solved by technology

Since the other end of the forming slider is connected to the ordinary nitrogen cylinder, under the action of the restoring force of the compressed nitrogen in the ordinary nitrogen cylinder during the molding process described above, the piston of the ordinary nitrogen cylinder and the forming slider return downward. Since the formed cover is still traveling upwards under the state of pressing the blank holder, the downward moving forming slider exerts a force on the cover, causing the cover to deform again, resulting in the "secondary deformation" of the cover. "Bump damage

This "secondary deformation" will damage the forming quality of the cover and reduce the qualified product rate of the production cover

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