Shaping method for internal high-pressure bent pipe

Abstract

The invention discloses a shaping method for an internal high-pressure bent pipe. The method comprises the following steps of: customizing a mold according to a bending angle and an outer diameter of a pipe to be processed, placing the pipe between a fixed mold and a movable mold, starting a hydraulic rod on one side of the movable mold, pushing the movable mold by the hydraulic rod, extruding the pipe by a movable mold cavity, bending the pipe along a workpiece cavity, and fixing the movable mold after bending; plugging one end of the pipe, and inserting the other end of the pipe into a water injection pipe; and injecting water into the pipe through the water injection pipe, so that water pressure in the pipe is increased, the pipe is expanded, and the inner wall of the pipe is completely attached to a workpiece cavity. The bent pipe is shaped by adopting the internal high pressure method, the inner wall of the pipe is not scratched, the pipe is not damaged, the inner wall of the pipe does not need to be polished, the production steps are saved, the pipe bending device is very practical, the long pipe can be bent, and compared with the prior art that only the pipe with the bending section length can be bent, the bent section is welded on the pipeline after being bent, so that the shaping method is more convenient and practical.

Description

technical field [0001] The invention belongs to the technical field of bent pipe shaping, and in particular relates to a method for shaping an inner high pressure bent pipe. Background technique [0002] The food-grade pipes on the market often use a bending machine to perform the pipe bending operation during the pipe bending process. After the pipe is bent, the pipe is often deformed, that is, the cross-sectional shape of the pipe bend is not circular, which affects the use. The existing method is Use the ball pushing technology to shape the pipe after bending. Push the ball with the same inner diameter as the pipe to squeeze the pipe from the inside to shape the pipe. Since the extrusion process often causes the internal wear of the pipe, the internal polishing of the pipe is also required. Not only The processing is cumbersome, and the pipe is damaged, so it is not practical. Contents of the invention [0003] The purpose of the present invention is to provide a metho...

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Problems solved by technology

[0002] The food-grade pipes on the market often use a bending machine to perform the pipe bending operation during the pipe bending process. After the pipe is bent, the pipe is often deformed, that is, the cross-sectional shape of the pipe bend is not circular, which affects the use. The existing method is Use the ball pushing technology to shape the pipe after bending. Push the ball with the same inner diameter as the pipe to squeeze the pipe from the inside to shape the pipe. Since the extrusion process often causes the internal wear of the pipe, the internal polishing of the pipe is also required. Not only The processing is cumbersome, and the pipe is damaged, so it is not practical

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