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Method of Forming Pipe Fittings with Equal Wall Thickness and Variable Diameter by Axially Unequal Wall Thickness Tube Blank

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 wrinkling, thickening, small wall thickness, etc., and achieve the effect of reducing quality, simple method, and saving raw materials

Active Publication Date: 2016-04-27
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 Forming Pipe Fittings with Equal Wall Thickness and Variable Diameter by Axially Unequal Wall Thickness Tube Blank
  • Method of Forming Pipe Fittings with Equal Wall Thickness and Variable Diameter by Axially Unequal Wall Thickness Tube Blank
  • Method of Forming Pipe Fittings with Equal Wall Thickness and Variable Diameter by Axially Unequal Wall Thickness Tube Blank

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specific Embodiment approach 1

[0014] Specific implementation mode one: combine Figures 1 to 12 Describe this embodiment. This embodiment includes a method for forming pipe fittings with equal wall thickness and variable diameter by using axially unequal wall thickness tube blanks. The specific steps are:

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

[0016] Step 2: After putting the tube blank 1 with 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 cause bulging deformation of the tube blank 1 with unequal wall thickness in the axial direction, until the tube blank 1 with unequal wall thickn...

specific Embodiment approach 2

[0019] Specific implementation mode two: combination figure 1 To illustrate this embodiment, in the first step, 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 axial 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 axial unequal wall thickness tube blank 1 before forming, d f is the diameter of the formed constant-wall-thickness variable-diameter pipe fitting 2, t f is the wall thickness of the formed equal-wall-thickness variable-diameter pipe fitting 2 . Other compositions and connections are the same as in the first embodiment.

[0020] The determination of the axial wall thickness distribution of the axial unequal wall thickness tube blank 1 can follow different calculation principles. The most common and simple method is to assume that the material of a certain axial part o...

specific Embodiment approach 3

[0029] Specific implementation mode three: combination figure 1 This embodiment will be described. In this embodiment, the pressure medium is gas, oil, pure water or emulsion. Other compositions and connections are the same as those 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 pipe fittings with equal wall thickness and variable diameter, in particular to a method for forming pipe fittings with equal wall thickness and variable diameter by using axial unequal wall thickness pipe blanks. Background technique [0002] In the fields of aviation, aerospace and automobile industry, reducing structural mass to save energy during operation is a long-term goal pursued by people, and it is also one of the trends in the development of modern advanced manufacturing technology. In order to reasonably distribute and bear loads such as torque, torque and bending moment, and to optimize the structure and reduce the quality of parts, tubular parts with a hollow middle and different diameters along the length direction are often used. Such parts are referred to as variable diameter tubes. For variable diameter pipes used as structural parts, it is generally required to have equal wall thickness e...

Claims

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Application Information

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