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Pipe hot medium internal pressure forming method based on molten glass

A technology of internal high pressure forming and molten state, which is applied in the field of internal pressure forming of pipe heat medium based on molten glass, can solve the problems of low heating rate, difficult sealing, low thermal conductivity, etc., achieve low compression rate, improve heating rate, The effect of excellent thermal conductivity

Active Publication Date: 2018-11-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low heating rate, low thermal conductivity, difficult sealing, and forming pressure of only about 0-50 MPa in the existing high-pressure forming method in a hot medium, and provides a pipe heating medium based on molten glass. Press forming method

Method used

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  • Pipe hot medium internal pressure forming method based on molten glass
  • Pipe hot medium internal pressure forming method based on molten glass
  • Pipe hot medium internal pressure forming method based on molten glass

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specific Embodiment approach 1

[0038] Specific implementation mode 1: This implementation mode is based on the molten glass-based internal pressure forming method of the pipe heat medium, including the following steps:

[0039] Step 1. Determine the high pressure forming temperature range in the pipe according to the type of pipe;

[0040] Step 2. Select the glass material according to the high pressure forming temperature in the pipe, so that the melting temperature of the glass material is the same as the high pressure forming temperature in the pipe;

[0041] Step 3: Place the pipe to be formed in an induction heater, and use induction heating to perform rapid preheating to obtain a pipe blank; wherein the preheating temperature is 100-300°C lower than the high-pressure forming temperature in the pipe;

[0042] Step 4. The forming mold includes a left mold and a right mold. Put the left mold and the right mold into the left and right sides of the hydraulic cylinder of the hydraulic press in the hot inter...

specific Embodiment approach 2

[0048] Embodiment 2: This embodiment differs from Embodiment 1 in that: the pipe material in Step 1 is titanium alloy, aluminum-magnesium alloy or high-strength steel pipe. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0049] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the method for determining the high-pressure forming temperature range in the pipe according to the type of pipe is:

[0050] At different temperatures, tensile tests are carried out on the pipes to obtain the stress-strain curves at different temperatures, and the elongation of the pipes at different temperatures is obtained from the stress-strain curves, so as to determine the optimum forming temperature range. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a pipe hot medium internal pressure forming method based on molten glass, and relates to a metal pipe forming method. The problems that according to existing hot medium internal high pressure forming methods, the heating speed is low, heat conducting coefficients are low, sealing is difficult, and forming pressure only can reach about 0-50MPa are solved. The method comprises the steps that 1, a pipe internal high pressure forming temperature interval is determined according to the pipe variety; 2, according to the pipe internal high pressure forming temperature, glass materials are selected; 3, a pipe to be formed is preheated; 4, a pipe blank is vertically placed into a forming die, and die closing and sealing are carried out; 5, the glass materials are heated to obtain molten glass; 6, the glass media are injected into the sealed pipe blank; 7, the pipe blank is heated to internal high pressure forming temperature under high-temperature filling; and 8, material supplementing is carried out; and 9, pressure maintaining is carried out, the molten glass flows out through an overflow valve, die opening is carried out, and the formed deformed-section pipe partis obtained. The pipe hot medium internal pressure forming method is used in the field of internal high pressure forming.

Description

technical field [0001] The invention relates to a metal pipe forming method. Background technique [0002] With the continuous improvement of modern aircraft's high-speed and high-maneuverability requirements, higher and higher requirements are put forward for the lightweight and long life of components. At the same time, reducing the weight of automobiles and airplanes is one of the measures to reduce energy consumption and pollution emissions. The main way to reduce weight is to use lightweight materials and lightweight structures. Lightweight materials include aluminum alloys, magnesium alloys, titanium alloys and composite materials. The main forms of light body structure include integral structure, thin shell and hollow variable section. Most of these materials have poor deformation ability at room temperature, and the elongation is generally less than 10% to 15%. It is difficult to form parts with complex cross-sectional shapes by traditional forming processes at ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033B21D26/041B21D26/047B21D26/049
CPCB21D26/033B21D26/041B21D26/047B21D26/049
Inventor 韩聪甄远承苑世剑
Owner HARBIN INST OF TECH
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