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Bending method and device for tubes with small bending radius

A bending radius and bending forming technology, which is applied in the field of pipe bending and forming, can solve the problems of large deformation degree and difficulty in forming dimensional accuracy, and achieve the effect of avoiding thermal deformation, good flow performance and reducing cross-section distortion.

Active Publication Date: 2020-07-28
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, the following problems exist in the prior art: it is difficult to form pipes with small bending radius with high dimensional accuracy and large degree of deformation due to hard-to-deform materials such as titanium alloys

Method used

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  • Bending method and device for tubes with small bending radius
  • Bending method and device for tubes with small bending radius
  • Bending method and device for tubes with small bending radius

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Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0052] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left" and "right" are based on the orientations and positional relationships shown in the drawings, and are only for convenience of description It does not indicate or imply that the referred part must have a specific orientation and operate in a specific orientation, and thus should not be const...

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Abstract

The invention discloses a bending forming method for a small bending radius tube. The method comprises the following steps that S1, a tube blank is filled with a solid particle medium; S2, the tube blank is put into a forming die and sealed; S3, current is applied to the tube blank, and electrifying is stopped after the temperature of the tube blank reaches an experiment required temperature; S4,the right end of the tube blank is driven to move inwards in the axial direction, the left side of the tube blank is driven to move in a tangential direction, shear-bending deformation of the tube blank occurs, and the left end of the tube blank is driven to move inwards in the axial direction; S5, when the forming size of the tube blank reaches a set value, feeding is stopped, and a formed tube is obtained; and S6, a punch is reset, the forming die is opened, the formed tube is taken out, the solid particle medium in the tube blank is removed, and the small bending radius tube is obtained. The problem of low forming limit in existing tube bending forming technologies at normal temperature can be solved, and the obtained formed tube has the characteristics such as small bending radius, high forming precision and excellent shaping performance.

Description

technical field [0001] The invention relates to the technical field of pipe bending, in particular to a method and device for bending a pipe with a small bending radius. Background technique [0002] In recent years, small bending radius tubes have been increasingly widely used in the fields of aviation and aerospace due to their ability to effectively save space and achieve structural weight reduction. Especially the small bending radius tube of titanium alloy material has the advantages of low density, high specific strength, good corrosion resistance, high heat resistance, good welding performance and non-magnetic, etc. It is used in small aerospace engine piping systems and unmanned aerial vehicles in the piping system. [0003] At present, traditional pipe bending processes such as push bending, bending, hydraulic bending, CNC winding, etc., can only form relative bending radius R b ≥1.0(R b is the ratio of the radius r of the neutral layer of the pipe bending to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D9/08B21D9/15B21D9/18
CPCB21D9/085B21D9/15B21D9/18
Inventor 韩聪冯浩
Owner HARBIN INST OF TECH
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