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Elastic core bar for bent pipe

An elastic core and pipe bending technology, which is applied in the field of elastic mandrels for pipe bending, can solve problems such as easy breakage, and achieve the effect of improving molding quality and effective and reasonable support

Active Publication Date: 2015-01-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcoming that existing mandrels for bending pipes are easy to break, the present invention provides an elastic mandrel for bending pipes that can be bent freely and can be bent with a small bending radius and has good forming quality.

Method used

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  • Elastic core bar for bent pipe
  • Elastic core bar for bent pipe
  • Elastic core bar for bent pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Refer to attached Figure 1-6 , an elastic mandrel for a bent pipe, comprising a mandrel 1 for supporting a straight pipe section and several core balls 3 for supporting a bent pipe section, the mandrel 1 and the core balls 3 are connected by an elastic body 2, The fixed end of the elastic body 2 is fixed in the mandrel 1, the free end of the elastic body 2 passes through the core ball 3 in turn and is provided with a clamping positioning block 21 for limiting the displacement of the core ball 3 at the end; defining the core The distance between the two end faces of the ball 3 is the thickness of the core ball 3, and the thickness of the core ball 3 is inconsistent.

[0029] Preferably, the front end is close to the mandrel 1 and the end is far away from the mandrel 1 , the thickness of the core ball 3 at the front end is shorter than the thickness of the core ball 3 at the end.

[0030] Preferably, the front end is close to the mandrel 1 and the end is far away from t...

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Abstract

An elastic core bar for a bent pipe comprises a core shaft used for supporting a straight pipe section and a plurality of core balls used for supporting a bent pipe section. The core shaft and the core balls are connected through an elastic body. The fixed end of the elastic body is fixed into the core shaft. The free end of the elastic body penetrates through the core balls in sequence, and a clamping positioning block limiting the displacement of the core balls is arranged at the end of the free end. The distance between two end faces of the core balls is defined as the thickness of the core balls. The thicknesses of the core balls are not consistent. The characteristics of a squillid body structure are used for reference, the spherical core balls are designed and connected through the elastic body, the wall of a pipe fitting can be more stably supported when small bent radius bending forming is carried out on the thin-wall pipe fitting, the friction force with the pipe fitting is smaller, and the quality of the bent pipe fitting is better.

Description

technical field [0001] The invention relates to an elastic mandrel for bending pipes. Background technique [0002] As a key lightweight component, thin-walled stainless steel elbow has the advantages of light weight, high strength, energy saving and environmental protection, and easy digitization, and has been widely used in aviation, aerospace and other high-tech fields. For example, the thin-walled stainless steel conduit used in the helicopter environmental control system should use pipe fittings with a diameter-to-thickness ratio of D / t>80 and elbows with a relative bending radius R / D<2. The stainless steel pipe fittings with large diameter-thickness ratio, thin wall, and small bending radius have obvious deformation strengthening during bending, and are easier to crack due to external tension and thinner wall thickness; small bending radii, larger deformation of the material, and easier Stretch cracking; pipe fittings with large diameter and weak circumferential...

Claims

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Application Information

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IPC IPC(8): B21D9/01B21D9/03
Inventor 蒋兰芳谷云庆刘红林伟明
Owner ZHEJIANG UNIV OF TECH
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