A flanging type pipe liquid filling forming sealing device and method

Abstract

The invention discloses a sealing device and method for flanging-type pipe liquid-filled forming, which comprises two sealing punches respectively used for sealing the two ends of the tube blank. The sealing punches include an inner punch, an outer punch and a restraining ring; the inner punch The end surface of the head head is a conical surface, and the outer punch is set outside the inner punch; the outer punch includes an outer punch seat, an outer punch sealing head and a sealing insert, and the outer punch seat is set outside the inner punch; The head end of the inner cavity of the sealing head of the outer punch and the sealing insert is a tapered cavity; when sealing, the pipe end is inserted into the gap between the front ends of the inner punch and the outer punch, and the conical surface of the inner punch is pressed into the end face of the tube blank to realize rigid expansion. And with the increase of the insertion depth of the tube blank, the gap is continuously narrowed, and the tube end is closely attached to the sealing section of the inner and outer punches to realize the self-sealing of the tube end; effective sealing can be achieved in both the internal high-pressure forming and the hydraulic filling of the tube, And by adjusting the number of sealing inserts of the outer punch and the gap between the outer punch and the inner punch, the sealing of pipes with different diameters and different wall thicknesses can be realized.

Description

technical field [0001] The invention relates to the technical field of metal pipe forming, in particular to a flanged pipe liquid-filled forming and sealing device and method. Background technique [0002] With the demand for lightweight technology in the fields of aerospace and automobiles, hollow special-shaped variable-section pipe fittings are used more and more widely instead of solid components. [0003] It is under such a background that the liquid-filled forming of pipes is an advanced forming technology for manufacturing hollow special-shaped variable-section pipes, which has been developed and applied rapidly. According to the sequence of mold clamping and liquid filling, it can be divided into two methods: internal high pressure forming and pipe liquid filling. Internal high pressure forming is to place the pipe in the mold first, then fill the pipe with high-pressure liquid, and use the action of high-pressure liquid to deform the pipe and fit the mold cavity in...

AI Technical Summary

Problems solved by technology

[0004] Internal high pressure forming generally adopts conical punch flare seal or O-shaped rubber ring seal. These two types of sealing methods must rely on the mold cavity to provide external constraints on the pipe end, and the corresponding structure needs to be processed inside the mold to cooperate, which increases The complexity of the mold

However, for pipes of different diameters and thicknesses, sealing punches of corresponding sizes must be used. At present, there is no general structure that can completely cover them, resulting in waste of materials, long replacement and adjustment cycles, low production efficiency, and increased costs.

[0005] The hydraulic pressure of the tube needs to seal the end of the tube blank before the mold is closed. Since the mold is not closed, the mold cannot provide external constraints for the tube blank. Therefore, the sealing structure must have an external constraint structure at the tube end to achieve sealing. Traditional internal high pressure forming. The flaring seal and O-ring seal structure are not suitable for the hydraulic filling process of pipes. At present, there is no reliable structure that can realize the pipe end sealing of pipes with different diameters and thicknesses in pipe hydraulic pressing.

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