A filling hydraulic forming device for special-shaped pipe fittings with variable cross-section

A technology for pressing and forming special-shaped pipe fittings, which is applied in the field of pipe forming and manufacturing. It can solve the problems of inability to actively compensate leakage, large control pressure overshoot, and component scrapping, and achieve simple and reliable structure, reduced pressure overshoot, and low cost. Effect

Active Publication Date: 2021-01-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, regardless of the control method, there is a response lag, especially when the pipe is just pressed, there is a large control pressure overshoot, and the overshoot may exceed the plastic strength of the pipe, resulting in expansion deformation and scrapping the component. A purely passive pressure valve control system cannot actively compensate for leakage
[0009] The hydraulic pressure control process often requires multi-stage support pressure control, and the constant pressure relief valve control method cannot meet the requirements, while the proportional or servo pressure control method is more costly

Method used

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  • A filling hydraulic forming device for special-shaped pipe fittings with variable cross-section
  • A filling hydraulic forming device for special-shaped pipe fittings with variable cross-section
  • A filling hydraulic forming device for special-shaped pipe fittings with variable cross-section

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Embodiment 1

[0045] Such as Figure 1-13 As shown, this embodiment provides a hydroforming device for variable cross-section special-shaped pipe fittings, including a hydroforming mold I, a two-way follow-up sealing device II, and a medium filling and pressure control system III; the hydroforming mold I is used to place pipes and press them into shape. In this embodiment, the forming member 01 is as Figure 10-11 As shown, the preferred material of the pipe: DD14, wall thickness: 2.0mm; the two-way follow-up sealing device II is used to perform follow-up sealing on both ends of the pipe; the medium filling and pressure control system III includes a medium filling system And a pressure control system, the medium filling system is used to fill the pipe with medium, and the pressure control system is used to control the internal support pressure of the pipe.

[0046] In this implementation, if Figure 3-7 as well as Figure 13 As shown, the filling hydraulic forming mold I includes a punch...

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Abstract

The invention discloses a hydro-pressing forming device for a variable-cross-section special-shaped pipe, and relates to the technical field of pipe forming and manufacturing. The hydro-pressing forming device comprises a hydro-pressing forming die, a bidirectional follow-up sealing device and a medium filling and pressure control system, wherein the hydro-pressing forming die is internally used for containing a pipe and for pressing forming of the pipe, the bidirectional follow-up sealing device is used for performing follow-up sealing on the two ends of the pipe, the medium filling and pressure control system comprises a medium filling system and a pressure control system, the medium filling system is internally used for filling media into the pipe, and the pressure control system is used for controlling internal supporting pressure of the pipe. The hydro-pressing forming device is used for hydro-pressing forming of the variable-cross-section special-shaped pipe.

Description

technical field [0001] The invention relates to the technical field of pipe forming and manufacturing, in particular to a filling hydraulic forming device for variable cross-section special-shaped pipe fittings. Background technique [0002] Driven by automobile safety collision and energy saving and emission reduction regulations, the application of high-strength lightweight materials and lightweight structures is an inevitable trend in the development of automobiles. One of the main ways to achieve lightweight is to design the component structure as a hollow variable cross-section structure. Internal high pressure forming technology is suitable for the production of hollow variable cross-section lightweight components, and has been widely used in the production of automotive lightweight components, such as chassis, body and exhaust pipe fittings. In recent years, in order to further realize the lightweight of automobile structures, the application of high-strength steel (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D26/041B21D26/045B21D26/047
CPCB21D26/041B21D26/045B21D26/047
Inventor 贺久强苑世剑
Owner HARBIN INST OF TECH
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