Inside high-pressure molding method and device of thin-wall stainless steel tube

Abstract

The invention discloses an inside high-pressure molding method and device of a thin-wall stainless steel tube. The inside high-pressure molding method of the thin-wall stainless steel tube is characterized by comprising the following steps: placing a parison tube into the molding cavity of a mould, then injecting a low-pressure liquid to the inside of the parison tube and exhausting air in the parison tube while feeding to the parison tube by two extrusion heads; after the two extrusion heads are in contact with the end surface of the parison tube, stopping feeding the low-pressure liquid, sealing the liquid inside the parison tube to automatically establish superhigh molding pressure, and beginning expanding and molding when the parison tube yields; continuing to feed by virtue of the extrusion heads, continuing to increase the inside pressure and continuing to carrying out the molding process, and meanwhile, complementing two broken parison materials to an expanding and deforming part, and keeping the inside pressure of the parison tube constant by virtue of an overflow valve; and maintaining molding until finishing. The invention also discloses an inside high-pressure molding device which can automatically adapt to finish high-pressure molding by utilizing superhigh pressure inside parts without a special expensive superhigh-pressure generating mechanism and has the characteristics of high efficiency and low cost; and a molded part has the characteristics of small material thinning quantity and high strength, thereby increasing the pressure-bearing grade of a pipeline system.

Description

technical field [0001] The invention relates to an energy-saving forming method and device for thin-walled stainless steel pressure pipes. Background technique [0002] Thin-walled stainless steel pressure piping is a new type of pressure piping system. Thin-walled stainless steel seamed pipe fittings are the key cost in this system. The traditional process is elastic body expansion, opening, and annealing. This traditional process requires expensive professional Ultra-high pressure generating mechanism, and the key material thinning amount is as high as 30-40%, the cost is high, and the strength is low. [0003] For this reason, someone develops a new forming mechanism to produce and manufacture pipe fittings, such as the Chinese patent CN200620068686.9, which is a high-peak thin-walled corrugated elastic pipe extrusion bulging machine, which is characterized in that it includes: a machine base, a left , right frame, mold supporting rod, mould, left sealing connecting plat...

AI Technical Summary

Problems solved by technology

[0002] Thin-walled stainless steel pressure piping is a new type of pressure piping system. Thin-walled stainless steel seamed pipe fittings are the key cost in this system. The traditional process is elastic body expansion, opening, and annealing. This traditional process requires expensive professional Ultra-high pressure generating mechanism, and the thinning of key materials for manufacturing is as high as 30-40%, with high cost and low strength

[0003] For this reason, someone develops a new forming mechanism to produce and manufacture pipe fittings, such as the Chinese patent CN200620068686.9, which is a high-peak thin-walled corrugated elastic pipe extrusion bulging machine, which is characterized in that it includes: a machine base, a left , right frame, mold supporting rod, mould, left sealing connecting plate, right sealing connecting plate, oil cylinder and piston, described left and right frame are installed on the machine base, described mold supporting rod has four, upper and lower Each two, axially connected between the left and right frame, the mold has multiple groups, axially socketed on the mold support rod, the left sealing plate and the right sealing plate are respectively arranged on the left and right sides of the mold. On the right side, the piston of the oil cylinder is connected to the right sealing plate, which realizes hydroforming. Its defect is that it uses the principle of mechanical extrusion, so it needs a special ultra-high pressure generating mechanism, and it cannot effectively control deformation, consumes a lot of energy, and the structure Unreasonable and other defects

Images