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Pipe semi-solid air pressure contact forming method

A thixoforming, semi-solid technology, used in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problem that the yield strength and thickness of the pipe should not be too high, the material with poor plasticity cannot be used, and it is not suitable for forming complex shapes. Parts and other problems, to achieve the effect of reduced deformation resistance, strong filling, and low tonnage

Active Publication Date: 2018-12-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problems that the yield strength and thickness of the pipe should not be too high in the existing pipe processing method, it cannot be applied to materials with poor plasticity, and it is not suitable for forming parts with complex shapes, and the tonnage of the forming equipment is large, thus providing a pipe Semi-solid gas pressure thixoforming method

Method used

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Effect test

specific Embodiment approach 1

[0023] Specific implementation mode 1: A semi-solid gas pressure thixotropy forming method for pipes in this implementation mode is carried out according to the following steps:

[0024] 1. Place the pipe in the cavity of the forming mold and close the mold, and then use the sealing plug with gas injection port and the sealing plug with gas output port to seal the inside of the pipe;

[0025] The thickness of the pipe is 1 mm to 10 mm;

[0026] 2. Heat the pipe to the semi-solid temperature, and keep warm when the solid phase volume percentage inside the pipe is 75% to 90%, and keep warm for 1min to 2min for every 1mm thick pipe;

[0027] 3. Continuously inject gas with a pressure of 90MPa to 150MPa into the pipe through the gas injection port until the outer wall of the pipe fits the mold cavity;

[0028] 4. Stop the heating of the pipe and open the valve of the gas output port at the same time to discharge the gas;

[0029] 5. Open the forming mold, take out the formed pip...

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that the pipes described in step 1 are aluminum alloy pipes, titanium alloy pipes, magnesium alloy pipes or steel pipe fittings. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the thickness of the pipe described in step 1 is 5 mm to 10 mm. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a pipe semi-solid air pressure contact forming method, and relates to a metal pipe internal bulging process method. The invention aims to solve problems that due to the fact that the existing pipe machining method requires that yield strength and thickness of the pipe can not be too high, and thus the existing pipe machining method can not be applied to materials with poorplasticity; the existing pipe machining method is not suitable for forming parts with complex shapes, and forming equipment is large in tonnage. The method comprises the step 1 of placing the pipe ina mold cavity of a forming mold, closing the forming mold and sealing the pipe; the step 2 of heating the pipe to a semi-solid temperature and preserving heat; the step 3 of continuously feeding airinto the inner of the pipe until the outer wall of the pipe is attached to the mold cavity of the forming mold; the step 4 of stopping the heating of the pipe and discharging the air; and step 5 of opening the forming mold, taking out the formed pipe from the mold cavity, and namely the pipe semi-solid air pressure contact forming method is completed. The invention is used for the pipe semi-solidair pressure contact forming.

Description

technical field [0001] The invention relates to a process method for internal bulging of metal pipes. Background technique [0002] The tube structure has the characteristics of high strength, high rigidity, material saving and beautiful appearance, and its formability is also very good. For example, in addition to traditional mechanical cutting methods such as turning, milling, and planing, pipes can also be processed by plastic methods such as punching, bending, shrinking (expanding), bulging, and turning. Hollow cross-section profiles mainly made of various metal thin-walled pipes are widely used in aerospace, vehicles, petrochemical, furniture, transportation and other fields, especially in automobiles and motorcycles, pipes are the most used type except for plates material. [0003] Taking the pipe as the blank, various processing is carried out to obtain the workpiece, which is called the secondary processing of the pipe, referred to as the pipe processing. Traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033B21D37/16
Inventor 程远胜马卓识
Owner HARBIN INST OF TECH
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