Internal high-pressure forming pushing and pressing device

Abstract

The invention discloses an internal high-pressure forming pushing and pressing device. The device comprises a pushing head assembly and a driving device used for driving the pushing head assembly to move in the axial direction of the pushing head assembly; the pushing head assembly comprises a pushing head and a plugging head, wherein the pushing head is a sleeve part with an outer thread, the plugging head is partially arranged in the pushing head in a sleeved mode, a shaft collar is arranged on the exposed portion of the plugging head, the back side of the shaft collar is matched with the front end face of the pushing head, a working surface used for pushing and pressing a pipe blank is formed on the front side of the shaft collar, a probing sealing portion is arranged on the portion, at the front side of the shaft collar, of the plugging head, and the axial diameter of the probing sealing portion is smaller than the inner diameter of the pipe blank, so that a seal ring with a bag cavity is arranged on the probing sealing portion in a sleeving mode; the plugging head is provided with a hydraulic pipe used for enabling a medium channel to be formed and an air pipe used for communicating with the bag cavity to supply compressed air. According to the device, the sealing capability of the pushing head and a pipe opening of the pipe blank are good, and demolding is not influenced.

Description

technical field [0001] The invention relates to an internal high pressure forming pushing device used in an internal high pressure forming process. Background technique [0002] Internal high pressure forming, also called hydroforming or hydroforming, is a material forming process that uses liquid as a forming medium to achieve the purpose of forming hollow parts by controlling internal pressure and material flow. [0003] Internal high pressure forming is mainly used for forming pipe fittings (round pipes, square pipes, special-shaped pipes, etc.). The mold cavity is formed after the faces are joined. During processing, the tube blank is put into the cavity part of the lower mold, and then the upper mold is lowered to constrain the tube blank in the cavity. Then one push head located at both ends of the tube blank bears against the corresponding end of the tube blank to provide the axial force of the tube blank, and the axial force is used for feeding. [0004] One or tw...

AI Technical Summary

Problems solved by technology

This kind of structure has relatively good sealing ability due to its certain joining pressure, but because this kind of structure needs to process a tapered surface at the end of the tube blank in advance, on the one hand, the tapered surface is not necessarily required by the pipe fittings. Therefore, in It needs to be cut off after processing, resulting in waste of pipe material and process. On the other hand, because the conical surface of the nozzle will be deformed due to the radial component of the conical surface, it will affect the demoulding

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