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Forming method for even thickness elbow and eccentric pipe

An eccentric tube, equal wall thickness technology, applied in the direction of pipes/pipe joints/fittings, elbows, siphons, etc., can solve the problems of unequal inner and outer arc wall thicknesses and material waste, and achieve the effect of improving production efficiency

Pending Publication Date: 2020-09-15
JIANGSU NEW HENGJI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of material waste caused by the unequal wall thickness of the inner and outer arcs of the existing elbow, and to invent a forming method for an equal-wall-thickness elbow and an eccentric pipe structure, which adopts a pipe with an eccentric structure. Bend pipe, ensure that the inner and outer arcs of the bent pipe are equal in size

Method used

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  • Forming method for even thickness elbow and eccentric pipe
  • Forming method for even thickness elbow and eccentric pipe
  • Forming method for even thickness elbow and eccentric pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 , 2 , as shown in 3

[0034] A method for forming an equal-wall-thickness elbow, which comprises the following steps:

[0035] First, the isopick tube is machined into figure 2 The eccentric tube shown, and make the thickness of the thinnest part of the eccentric tube equal to the thickness of the final formed tube, the thickest part of the eccentric tube wall thickness is placed at the inner arc B of the preformed elbow, and the thinnest part of the eccentric tube is placed at The outer arc A of the preformed elbow; the distance between the inner and outer circle centers of the eccentric tube meets the requirements of formula (1), and the maximum wall thickness of the eccentric tube meets the requirements of formula (2):

[0036]

[0037] t max =(1+r / R)t 0 (2)

[0038] In the formula:

[0039] △—the distance between the inner and outer circle centers of the eccentric tube, mm;

[0040] R—the bending radius of the elbow, mm;

[0041] r—the...

Embodiment 2

[0046] An eccentric tube for processing bent tubes with equal wall thickness, which can be formed by rolling or mechanically. The center of the hollow circle of the eccentric tube and the center of the tube are radially eccentric, and the eccentric distance and the size of the thickest part of the eccentric tube meet:

[0047]

[0048] t max =(1+r / R)t 0 (2)

[0049] In the formula:

[0050] △—the distance between the inner and outer circle centers of the eccentric tube, mm;

[0051] R—the bending radius of the elbow, mm;

[0052] r—the outer radius of the elbow, mm;

[0053] t 0 — specified wall thickness of the elbow, mm;

[0054] t max —The maximum wall thickness of the eccentric tube, mm.

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Abstract

Disclosed are a forming method for an even thickness elbow and an eccentric pipe which are characterized in that the wall thicknesses of any longitudinal and transverse sections of the formed elbow are even and equal, and the thicknesses of an outer arc A and an inner arc B are equal. A forming process is bending forming, medium frequency induction heating bending forming can be adopted, or die cold bending forming is adopted. The key of the forming method lies in the fact that an adopted raw material metal pipe is the eccentric pipe, the thickest position of the wall thickness of the eccentric pipe is put at the outer arc A of a preformed elbow, and the thinnest position of the eccentric pipe is put at the inner arc B of the performed elbow. The center distance of the inner circle and theouter circle of the eccentric pipe and the maximum size of the wall thickness of the eccentric pipe can be calculated with formulas. The forming method is simple and easy to operate, the pipe of an eccentric structure is adopted for machining and manufacturing the elbow, the equal sizes of the inner and outer arcs of the bent elbow are ensured, thus even whole performance of the product and the raw material utilization rate are ensured, and production effectiveness of the product is improved.

Description

technical field [0001] The invention relates to a pipe forming technology, in particular to an elbow forming technology, in particular to a forming method of an equal-wall-thickness elbow and an eccentric pipe. It presets the wall thickness size of the raw material according to the wall thickness change in the pipe forming process, and forms the required size of the product through the thinning or thickening of the wall thickness in the bending process, so as to achieve the purpose of uniform wall thickness of the bent pipe. Background technique [0002] Since the wall thickness changes (thinning of the outer arc and thickening of the inner arc) will occur during the bending process of the pipe, in order to ensure that the wall thickness of the outer arc of the bent pipe meets the requirements of engineering use, it is usually achieved by thickening the wall thickness of the raw material pipe. accomplish. The elbow formed in this way ensures the wall thickness of the outer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06F16L43/00
CPCB21C37/06F16L43/001
Inventor 鲍艳东李加全
Owner JIANGSU NEW HENGJI SPECIAL EQUIP