A method for internal pressure forming of large-scale thin-walled pipe fittings with gas-liquid mixed fluid

A gas-liquid mixing, large-scale technology, used in metal processing equipment, metal processing, manufacturing tools, etc., can solve the problems of pressure rise, high equipment cost, low efficiency, etc., and meet the requirements of improving stability and reducing sealing effect. Effect

Active Publication Date: 2020-12-29
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the inner cavity of the tube blank has a large volume and the required gas pressure is high, it takes a long time to charge and release the high-pressure gas
Therefore, when "pneumatic pressing" is used to form large-size thin-walled pipe fittings, the production efficiency is low
In addition, the preparation and control of high-flow high-pressure gas require special equipment and high costs
[0006] In order to solve the "pressurization and pressing" of the existing large-size thin-walled pipe fittings, the pressure drops rapidly due to the leakage of the liquid inside the tube blank or the pressure rises rapidly due to the compression of the liquid, and it takes a long time due to the large gas compression ratio. Inflated pressurization leads to problems such as high efficiency and low cost, and a new fluid pressure forming method for manufacturing large-scale thin-walled pipes is needed

Method used

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  • A method for internal pressure forming of large-scale thin-walled pipe fittings with gas-liquid mixed fluid
  • A method for internal pressure forming of large-scale thin-walled pipe fittings with gas-liquid mixed fluid
  • A method for internal pressure forming of large-scale thin-walled pipe fittings with gas-liquid mixed fluid

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Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a gas-liquid mixed fluid internal pressure forming method for large-scale thin-walled pipe fittings, which includes the following steps:

[0039] Step 1. Determine the internal pressure; analyze the characteristics of the part to be formed, and determine the value of the support internal pressure required for forming;

[0040] Step 2, calculate the volume; calculate the inner cavity volume of the original tube blank 11 and its change in the whole forming process;

[0041] Step 3, determine the gas-liquid volume ratio; according to the change characteristics of the inner cavity volume of the tube blank 11, determine the sequence and volume ratio of filling the gas medium and liquid medium into the tube blank 11;

[0042] Step 4, placing the tube blank 11; figure 1 As shown, the large-size thin-walled tube blank 11 to be formed is placed on the mold, and the mold is closed to a certain position;

[0043] Step five, end sealing; figure 2 As sho...

Embodiment 2

[0052] In the gas-liquid mixed fluid internal pressure forming method for large-scale thin-walled pipe fittings provided in this example, in step 2, only the inner cavity volume of the original tube blank and the inner cavity volume of the final part are calculated, and the volume change during the entire forming process is not calculated . Other steps are the same as in Embodiment 1.

[0053] The beneficial effects of this embodiment are: for large-sized tube blanks, there is no need to calculate the volume change in the whole process, and there is no need to adjust the pressure in real time; During the forming process, the change in the volume of the inner cavity of the tube blank is only 10-20% of the volume of the original tube blank. Due to the large compression ratio of the gas, the relative change of the gas pressure in the inner cavity of the tube blank is only 10-25%. This variation range of the gas pressure will not have an adverse effect on the forming process, so...

Embodiment 3

[0055] In the gas-liquid mixed fluid internal pressure forming method for large-scale thin-walled pipe fittings provided in this embodiment, in step 6, the volume of liquid charged into the tube blank is about 50-100 liters. Other steps are the same as in Embodiment 1.

[0056] The beneficial effects of this embodiment are: large-size tube blanks occupy space by using liquid, use gas to provide pressure, high efficiency and low cost; pre-fill a large volume of liquid into the cavity of large-size thin-walled tube blanks, and then fill the tube The remaining space in the inner cavity of the billet is filled with gas, that is, the liquid is used to occupy most of the space first, and then the gas is used to provide the support pressure, which solves the problem of "inflating and pressing" that only uses gas for internal support. The problem of long inflation and deflation time and low production efficiency caused by high air pressure. At the same time, the preparation and contr...

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Abstract

The invention discloses a gas-liquid mixed fluid internal pressure forming method for large-scale thin-walled pipe fittings. Gas and liquid are filled into the thin-walled tube blank according to a certain volume ratio, and the pressure of the gas-liquid mixed fluid is mainly determined by the pressure of the gas. The shape change of the thin-walled tube blank is accompanied by the change of the inner cavity volume of the tube blank. Because the compression ratio of the gas is large, the pressure of the gas and liquid will not change with the volume of the tube blank during the deformation process of the thin-walled tube blank. However, the support pressure on the inner cavity of the thin-walled tube blank is very stable during the entire forming process. In addition, even if there is a slight leakage of liquid or gas during the forming process, the medium pressure inside the tube blank will not fluctuate greatly, which in turn reduces the requirements for the sealing effect during the tube blank forming process and improves the stability of the forming process gender, success rate.

Description

technical field [0001] The invention relates to the technical field of pipe fittings forming, in particular to an internal pressure forming method of gas-liquid mixed fluid for large-scale thin-walled pipe fittings. Background technique [0002] In aerospace, automobile, high-speed rail and other fields, realizing the lightweight of components is an important way to improve fuel efficiency and save energy consumption. Lightweight components are mainly achieved through two aspects: structural lightweight and material lightweight. Lightweight structures generally refer to the use of optimized designed integral components with complex special-shaped sections and bending axes. The lightweight of materials mainly refers to the use of materials such as aluminum alloys, magnesium alloys, titanium alloys, and high-strength steels with high specific strength. At present, there have been many complex integral components made of lightweight materials, and the lightweight of component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D26/033B21D26/047B21D26/041B21C51/00
CPCB21D26/033B21D26/047B21D26/041B21C51/00B21D26/045B21D26/049
Inventor 何祝斌李亚楠林艳丽胡馨予冷林威苑世剑
Owner DALIAN UNIV OF TECH
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