Gear chain type core rod for bending forming of rectangular pipe

Abstract

The invention discloses a gear chain type core rod for bending forming of a rectangular pipe. The gear chain type core rod for bending forming of the rectangular pipe comprises one or more core balls,a core shaft and a gear chain type connector. The core balls are used for supporting the bent pipe section of the rectangular pipe, the core shaft is used for supporting the linear section of the rectangular pipe, and the gear chain type connector is used for connecting the core balls and connecting the core balls and the core shaft. The gear chain type connector comprises single-side gear plates, double-side gear plates, connecting pieces, long limiting rings, short limiting rings and shafts. Each core ball is a shell which is of a cuboid structure, and a first installation cavity is formedinside each shell. The core shaft is of a cuboid structure. The gear chain type core rod for bending forming of the rectangular pipe has the certain universality, can be suitable for bending forming of the thin-wall pipe with the small bending radius, and is high in supporting accuracy.

Description

technical field [0001] The invention relates to a gear chain mandrel for bending and forming a rectangular 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, thin-walled (D / t>30) and small bending radius (R / D<2) thin-walled pipes are prone to instability and wrinkling due to the pressure on the inner wall of the bend during CNC bending; Thinning, it is easy to tear; 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 inside the thin-walled tube to provide internal support. The most commonly...

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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 mandrel for rectangular tube bending with high support accuracy is proposed, which has certain versatility, can be used for thin-walled, thin-walled tubes with small bending radius, and has high support accuracy.

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