Gear chain type core rod for round pipe bending forming

Abstract

The invention discloses a gear chain type core rod for round pipe bending forming. The gear chain type core rod comprises one or more core balls used for supporting a round pipe bent pipe segment, a core shaft used for supporting a round pipe straight segment and gear chain type connecting bodies used for connecting the core balls and connecting the core balls with the core shaft. Each gear chaintype connecting body comprises single-side gear plates, dual-side gear plates, connecting pieces, long limiting rings, short limiting rings and shafts. The core balls are shells of spherical structures. A first mounting cavity is formed in each shell. The core shaft is of a cylinder shaft. The gear chain type core rod has certain university, can be suitable for bending forming of thin-wall pipes large in radius-thickness ratio and small in bending radius and is high in supporting precision.

Description

technical field [0001] The invention relates to a gear chain mandrel for bending and forming a circular tube. Background technique [0002] Metal thin-walled hollow pipe fittings have been widely used in the fields of aviation, aerospace, vehicles, ships and petrochemicals due to their advantages such as high strength, light weight, easy forming, and beautiful appearance. However, when the thin-walled tube with large diameter-to-thickness ratio (D / t>50) and small bending radius (R / D<2) is bent and formed by CNC, it is very easy to lose stability and wrinkle due to the pressure on the inner wall of the bent tube; It is easy to crack when it is thinned by tension; the combined force of the two makes the section of the elbow flattened and distorted, or even collapsed, so it is very difficult to form. [0003] In order to reduce the bending defects of thin-walled tubes with large diameter-to-thickness ratio and small bending radius, it is necessary to install a mandrel in...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the core ball of the existing mandrel will naturally sag due to its own weight and cannot be fixed at a specific position, and the support accuracy of the existing mandrel to the thin-walled tube is not high, which affects the large diameter-thickness ratio, For the problem of bending accuracy of thin-walled tubes with small bending radius, a gear-chain core for bending and forming round tubes with high support accuracy is proposed, which has certain versatility, can be used for bending forming of thin-walled tubes with large diameter-thickness ratio, and has small bending radius. Great

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