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A method of axially pressing a corrugated pipe

A corrugated tube and tube shaft technology, which is applied in the field of corrugated tube axial pressing, can solve the problems of complex manufacturing process, low production efficiency, and unstable size, and achieve good dimensional stability, high production efficiency, and reduced production costs. Effect

Active Publication Date: 2019-09-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0008] In order to overcome the shortcomings of complex devices, complex manufacturing processes, unstable dimensions, and low production efficiency in the prior art, the present invention proposes a tube axial compression forming method for corrugated tubes

Method used

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  • A method of axially pressing a corrugated pipe
  • A method of axially pressing a corrugated pipe
  • A method of axially pressing a corrugated pipe

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Embodiment Construction

[0035] The invention is a tube axial pressing forming method for forming corrugated tubes. The tube blank of the bellows is a 6061-T4 aluminum alloy circular tube, and the dimensions of the tube blank in each embodiment are shown in Table 1:

[0036] The size of the tube blank in each embodiment of table 1

[0037]

[0038]

[0039] Concrete forming steps of the present invention are as follows:

[0040] Step 1: Make the lower mold 3. The lower die is cylindrical, and its outer peripheral surface is divided into a conical forming section and a cylindrical supporting section. The half-cone angle β of the forming section is 75°-89°. The total height of the lower mold is H, and the height of the supporting section is h. The maximum diameter of the lower mold is D, and the minimum diameter is d. In order to ensure that the tube blank 2 is just set on the lower mold 3 and is formed stably, d is smaller than the inner diameter of the tube blank d G Small 3 ~ 5mm. The spe...

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Abstract

The invention discloses a pipe shaft pressure forming method of a corrugated pipe. A metal corrugated pipe is prepared by using instable corrugation of the pipe shaft pressure of a conical mold; the characteristics of no mold constraint and free deformation are achieved in the forming process; and through the characteristic of the wavelength of critical instable corrugation waves sensitive to halftaper angles of contact surfaces, the wave crest height and the wavelength of the corrugated pipe can be adjusted by changing the half taper angles of a lower mold to manufacture the corrugated pipewith a diameter-to-thickness ratio in a specification range of 10-62.5. Compared with a traditional metal corrugated pipe forming process, the method overcomes the diameter-to-thickness ratio limitation, can meet the manufacturing of metal corrugated pipes with smaller diameter-to-thickness ratios, and achieves the technical effects of simple process and high size stability, that is, the wave crest height and the wavelength of subsequent corrugation waves are totally the same, so that the production cost of the metal corrugated pipes is greatly reduced, and the production efficiency is high.

Description

technical field [0001] The invention relates to the field of plastic forming, in particular to a tube axial pressure forming method for corrugated tubes. Background technique [0002] Bellows is a shell component with transverse corrugations, which can compensate for pipeline thermal deformation, shock absorption, and absorb pipeline settlement deformation, etc. It has broad application prospects in aerospace, aviation, automobile and high-tech industries. For metal bellows with high material strength, welding forming, rubber forming (elastic mold forming), hydroforming and mechanical forming are generally used. [0003] Welding forming is to suppress the waveform on the plate first, and then roll it into a circle for welding. Due to the large number of welds, defects such as welding cracks, incomplete penetration and lack of weld appearance are prone to occur, which seriously affects the formability and service life of the bellows. New aerospace products require reliable a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D15/06
Inventor 孙志超曹婧吴慧丽印志坤黄龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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