Inner high-pressure rubber pocket pipe fitting bending and forming device and forming method thereof

Abstract

The invention provides an inner high-pressure rubber pocket pipe fitting bending and forming device and a forming method thereof. The device mainly comprises a mould frame, an upper mould, a lower mould, an upper gear, a lower gear, a rocker arm, a ratchet, a bent push block, a rubber pocket, a push rod and the like; a hollow thin-wall pipe fitting to be bent and formed is sleeved on the rubber pocket; a gear mechanism is used for converting small-radius bent circumferential movement into the linear motion of the ratchet, the motion is transmitted to the ratchet through the gear force, the balance of the ratchet force is controlled through a push head of a hydraulic press, and the thin-wall small-radius guide pipe is bent into a small-radius elbow. The method utilizes the device, replaces a metal core rod or filler with the rubber pocket, and adopts hydraulic oil, so that the rubber pocket clings to the inner wall of a mould, and completes the bending of the bent pipe through the pressing of a hydraulic system. The invention can increase the roundness of a bent section by reducing or without increasing any weld seam so that the relative bending radius can reach 0.75 to 1, and has the advantages of good part completeness, uniform wall thickness, high strength and rigidity, no circumferential weld seam and the like.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing, and in particular relates to a push-bending forming device and a forming method for an inner high-pressure rubber bag pipe fitting. Background technique [0002] After years of development, the bending and forming of pipe fittings has formed a variety of processing methods. Divided according to different standards, the bending method can be divided into the following types: according to whether the tube blank is heated during bending, it can be divided into hot bending and cold bending; according to the different bending methods, it can be divided into stretch bending and compression bending. , bending, push bending, rolling and extrusion bending; according to the different ways of restricting the pipe during bending, it can be divided into internal restriction of pipe fittings, external restriction of pipe fittings and internal and external restriction of pipe fittings; accordi...

AI Technical Summary

Problems solved by technology

[0006] (3) Although the small-radius elbow made by the shear bending method can achieve a small relative bending radius, the material flow distribution in the middle straight section and the curved section is not good, so it is easy to crack;

[0007] (4) Although the internal pressure push bending method can form an elbow with a small bending radius, the processing efficiency is relatively low, and when the filler shrinks or the fluidity is not good, it is easy to cause the inner wall to wrinkle;

[0008] (5) The most unavoidable problem of the push bending method with mandrel support is that the large deformation area is affected by the rigid support point, so the inner wall of the catheter is not smooth, so it only stays in the finite element simulation stage, and no prototype is successfully trial-produced;

[0009] (6) The equipment used in the bending method can easily cause excessive thinning or even cracking of the outer wall of the catheter, so it is difficult to form a small-radius elbow;

[0010] (7) Although the automation of the horn mandrel heating and bending method is relatively high, it is not suitable for equal-section bending of catheters

[0011] In summary, the existing bending methods for thin-walled small-radius catheters generally have defects such as low strength and poor formability.

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