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Manufacturing method of small-bending-radius ultrathin-wall pipe

A technology of bending radius and manufacturing method, which is applied in the field of ultra-thin-walled pipe fittings manufacturing with small bending radius, can solve the problems of high product rejection rate, large deformation of tube blank, inner ring wrinkles, etc., and achieve high material utilization rate and complex shape of components , the effect of fewer processes

Active Publication Date: 2021-04-09
南京航威智造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For pipes with thin wall thickness (D / t≥20), especially ultra-thin wall pipes with a ratio of diameter to wall thickness greater than 100, bending will cause a large amount of deformation of the tube blank, and then the inner ring of the bending part Defects such as wrinkles will appear, and defects such as cracks will appear on the outer ring of the bent part. Various common defects are very easy to appear, resulting in a high product rejection rate

Method used

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  • Manufacturing method of small-bending-radius ultrathin-wall pipe

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, present embodiment implements under the premise of technical solution of the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0025] Such as figure 1 As shown, the embodiment of the present invention provides a method for manufacturing an ultra-thin-wall pipe with a small bending radius, including: customizing the mold according to the bending radius, bending angle and outer diameter of the pipe to be manufactured. Wherein, as shown in Figure 1, the mold of the present invention includes a movable mold 1 and a static mold 2, and the opposite sides of the movable mold 1 and the static mold 2 are respectively provided with a movable mold cavity 3 and a static mold cavity 4, and the pipe fittings are finally placed on the movable mold...

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Abstract

The invention discloses a manufacturing method of a small-bending-radius ultrathin-wall pipe. The method includes the steps of: customizing a mold according to the boundary dimension of a to-be-manufactured pipe; cutting a straight pipe of which the outer diameter is smaller than that of the to-be-manufactured pipe to form a pipe blank, placing the pipe blank in a static die cavity of the mold, and fixing the two ends of the pipe blank; before bending, sealing one end of the pipe blank, and filling the pipe blank with liquid from the other end to reach a preset pressure; in a process from the beginning of a bending process to a mold assembling process, gradually increasing the liquid filling pressure from the preset pressure to a forming pressure; after mold assembly, increasing the liquid filling pressure in the pipe blank to an expansion pressure and maintaining the expansion pressure for a set time; and taking out the manufactured pipe. According to the manufacturing method, by virtue of the matching relation between a mold assembling force loading route and an internal pressure loading route, technological parameters such as different axial thrust routes, reference loading rates, waveforms and the like in a loading process are optimized, and therefore green, accurate and intelligent manufacturing of an ultrathin-wall complex pipe, which develops from nothing, is achieved.

Description

technical field [0001] The invention relates to the technical field of manufacturing ultra-thin-walled pipe fittings, in particular to a method for manufacturing ultra-thin-walled pipe fittings with a small bending radius. Background technique [0002] With the rise of a large number of high-tech industries represented by aviation and aerospace, the rapid development of advanced manufacturing technology has been promoted, especially the progress of pipe bending technology is the most obvious. In recent years, pipe bending technology has not only been widely used in pipeline equipment in chemical industry, petroleum, hydropower and other departments, but also has been widely used in aerospace, nuclear power industry, automobile industry, shipbuilding and other fields, playing an increasingly important role. effect. [0003] Using a hollow member similar to an elbow can not only reduce weight, but also maximize the strength and rigidity of the material. The pipe bending part...

Claims

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Application Information

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IPC IPC(8): B21D26/033B21D26/047
CPCB21D26/033B21D26/047
Inventor 周军生刘广友郭训忠丁仕雷
Owner 南京航威智造科技有限公司
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