Self-return type necking die with sealing structure

Abstract

The invention relates to a self-return type necking die with a sealing structure. The self-return type necking die with the sealing structure comprises an upper template (1), a lower template (2), a female die (3), a male die (4), a pull rod (6), a spring (7) and the sealing structure, wherein the female die (3) is fixedly installed in the center of the lower template (2); the upper template (1) and the female die (3) are connected through the pull rod (6); the pull rod (6) between the upper template (1) and the female die (3) is sleeved with the spring (7); the upper end of the spring (7) is fixed to the lower surface of the upper template (1); the lower end of the spring (7) is fixed to the upper surface of the female die (3); the male die (4) is installed in the center of the upper template (1); the upper portion of the male die (4) is connected with a male die fixing board (5); the female die (3) and the male die (4) are coaxial; the sealing structure is arranged on the outer side of the spring (7). The self-return type necking die with the sealing structure has the advantages of being stable in working, low in energy consumption, long in service life and convenient in unloading.

Description

technical field [0001] The invention relates to the technical field of molds, in particular to an automatic return shrinking mold with a sealing structure. Background technique [0002] Necking is a forming process in which the mouth of a pre-formed cylindrical or pipe blank is reduced through a shrinking die. The necking process is widely used, and can be used for the necking processing of bullet casings, shell casings, steel gas cylinders, bicycle frame risers, bicycle seat saddle pipes, and steel pipe drawing. The general operation is to apply pressure to the cylindrical or pipe blank to make it slide to the die of the shrinking die, and the diameter of the shrinking end of the cylindrical material is reduced under the pressure of the inner wall of the die. The structure of the necking die is divided into three types: no support, external support and internal and external support according to the support situation. The corresponding support structure can be selected acco...

AI Technical Summary

Problems solved by technology

The unsupported structure is relatively simple, but the fit is not precise during the necking process, and the deformation of the blank is unstable, resulting in a decline in product quality

After shrink forming, external power equipment needs to lift the upper die to separate the die from the punch, consuming energy

In addition, the shrinking die works in a harsh environment for a long time, and the service life of the shrinking die is short

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