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Method of manufacturing equal wall thickness variable-diameter pipe fittings out of axial unequal-wall-thickness pipe blanks

A technology of equal wall thickness and variable diameter, which is applied in the field of wall thickness variable diameter pipe fittings, can solve the problems of thickening, wrinkling, small wall thickness, etc., and achieve the effect of reducing quality, simple method and saving raw materials

Active Publication Date: 2014-04-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing problem that when using equal-wall thickness tube blanks to prepare variable-diameter pipe fittings, local thickening or wrinkling is easy to occur, and the wall thickness is smaller in areas with larger diameters, and further provides a method that adopts axial Method for forming pipe fittings with equal wall thickness and variable diameter from pipe blanks with different wall thickness

Method used

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  • Method of manufacturing equal wall thickness variable-diameter pipe fittings out of axial unequal-wall-thickness pipe blanks
  • Method of manufacturing equal wall thickness variable-diameter pipe fittings out of axial unequal-wall-thickness pipe blanks
  • Method of manufacturing equal wall thickness variable-diameter pipe fittings out of axial unequal-wall-thickness pipe blanks

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specific Embodiment approach 1

[0014] Specific implementation mode 1: Combination Figure 1 to 12 To illustrate this embodiment, this embodiment includes a method for forming a tube with variable diameter of equal wall thickness by using a tube blank of axially unequal wall thickness. The specific steps are as follows:

[0015] Step 1: According to the shape of the variable diameter tube 2 to be formed, select the required axial unequal wall thickness tube blank 1 through calculation;

[0016] Step 2: After placing the tube blank 1 of axially unequal wall thickness into the upper mold 4 and the lower mold 5, close the upper mold 4 and the lower mold 5;

[0017] Step 3: Seal one end of the tube blank 1 with unequal wall thickness in the axial direction, and pass a pressure medium into the tube blank 1 with unequal wall thickness from the other end to make the tube blank 1 with unequal wall thickness in the axial direction undergo bulging deformation until it is not equal The outer wall of the wall thickness tube b...

specific Embodiment approach 2

[0019] Specific implementation manner two: combination figure 1 To illustrate this embodiment, in the step 1, the formula for calculating the axial wall thickness distribution is: t 0 =λ·d f ·T f / d 0 , Where t 0 Is the wall thickness of the axially unequal wall thickness tube blank 1 before forming, λ is a correction coefficient greater than 1, and the value range is 1.1 to 1.3, d 0 Is the diameter of the axially unequal wall thickness tube blank 1 before forming, d f Is the diameter of the uniform wall thickness variable diameter pipe 2 after forming, t f It is the wall thickness of the formed equal-thickness variable-diameter pipe fitting 2. The other composition and connection relationship are the same as in the first embodiment.

[0020] Different calculation principles can be followed to determine the axial wall thickness distribution of the axially unequal wall thickness tube blank. The most common and simple method is to assume the material of a certain part of the axial u...

specific Embodiment approach 3

[0029] Specific implementation mode three: combination figure 1 This embodiment will be explained. In this embodiment, the pressure medium is gas, oil, pure water or emulsion. The other composition and connection relationship are the same as in the second embodiment.

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Abstract

The invention relates to a method of manufacturing equal wall thickness variable-diameter pipe fittings out of axial unequal-wall-thickness pipe blanks, in particular to a method of manufacturing variable diameter pipes out of axial unequal-wall-thickness pipe blanks by a bulging process, and solves the problems that local thickness increase or wrinkle easily occurs to the process of manufacturing variable diameter pipe fittings out of equal wall thickness pipe blanks and the larger the diameter of an area, the smaller the wall thickness of the area is. The method includes the steps of 1, according to the shape of an equal wall thickness variable-diameter pipe to be formed, selecting an axial unequal-wall-thickness pipe blank by calculation; 2, placing the axial unequal-wall-thickness pipe blank into an upper die and a lower die, and closing the upper die and the lower die; 3, sealing one end of the axial unequal-wall-thickness pipe blank, introducing pressure medium into the axial unequal-wall-thickness pipe blank from the other end to achieve bulging deformation of the axial unequal-wall-thickness pipe blank. The method is applicable to manufacturing equal wall thickness variable-diameter pipe fittings by the bulging process.

Description

Technical field [0001] The invention relates to a method for forming a pipe with variable diameter with equal wall thickness, in particular to a method for forming a pipe with variable diameter with equal wall thickness by adopting a tube blank of axially unequal wall thickness. Background technique [0002] In the fields of aviation, aerospace and automobile industry, reducing structural quality to save energy during operation is a long-term goal that people pursue, and it is also one of the development trends of modern advanced manufacturing technology. In order to distribute and bear the load such as torque, torque and bending moment reasonably, and to optimize the structure and reduce the quality of parts, tubular parts with a hollow center and different diameters along the length are often used. Such parts are referred to as variable diameter pipes. For variable-diameter tubes used as structural parts, it is generally required to have the same wall thickness everywhere. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033
Inventor 何祝斌陈久亮苑世剑
Owner HARBIN INST OF TECH