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Charging pressing forming method for variable-cross-section special-shaped pipe

A technology of special-shaped pipe fittings and variable cross-section, which is applied in the field of pipe filling hydraulic forming and metal pipe fitting manufacturing. It can solve problems such as mold wear, high pressure, and large springback, and achieve improved efficiency, improved thinning, and ring direction. The effect of uniform distribution of wall thickness reduction

Active Publication Date: 2016-05-11
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems that the existing low internal pressure forming process can only form pipe fittings with constant cross-section perimeter, and at the same time, there are problems of high pressure, large rebound and serious mold wear during the internal high-pressure forming of advanced high-strength steel variable-section pipe fittings, and further provides a A filling hydraulic forming method for special-shaped pipe fittings with variable cross-section

Method used

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  • Charging pressing forming method for variable-cross-section special-shaped pipe
  • Charging pressing forming method for variable-cross-section special-shaped pipe
  • Charging pressing forming method for variable-cross-section special-shaped pipe

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specific Embodiment approach 1

[0046] Specific implementation mode one: combine Figure 2-Figure 21 To illustrate, a method of filling hydraulic forming of variable cross-section special-shaped pipe fittings in this embodiment is carried out in accordance with the following steps:

[0047] Step 1. Assemble the bulging upper die 1 and the bulging lower die 4 on the press according to the design requirements, the bulging lower die 4 is fixed, the bulging upper die 1 goes up to the set height, and the bulging upper die 1 and the bulging The open space of the lower mold 4 is used to place the tube blank 6;

[0048] Step 2. By controlling the movement of the main slider of the press, the bulging upper mold 1 moves downward to close the mold, and the left sealing punch 2 and the right sealing punch 5 move towards each other under the action of the horizontal cylinder, so that the tube blank 6 is respectively in contact with the left sealing punch. The head 2 and the right sealing punch 5 form a closed cavity, th...

specific Embodiment approach 2

[0062] Specific implementation mode 2: In step 5 and step 6 of this embodiment, the set value p is 5MPa-50MPa. The set value p in this embodiment is not enough to cause plastic deformation of the tube blank. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0063] Specific implementation mode three: combination Figure 2-Figure 12 and Figure 13 , the variable cross-section pipe fitting (62) obtained in step 7 of this embodiment is a variable cross-section rectangular pipe fitting. Such setting meets the design requirements and actual needs. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a charging pressing forming method for a variable-cross-section special-shaped pipe, and relates to a forming manufacturing method of a metal pipe. The problems that an existing low-internal-pressure forming technology only can form a pipe with the unchangeable section perimeter, and meanwhile, in the internal-high-pressure forming process of an advanced high-strength steel variable-cross-section pipe, the pressure is high, springback is large, and a mold is seriously worn are solved. The forming method comprises the steps that firstly, an upper expansion mold and a lower expansion mold are assembled on a pressure machine; secondly, the upper expansion mold descends to perform mold assembly, a pipe blank is subject to charging, and the pipe blank expands until the pipe blank is attached to the mold; thirdly, the internal pressure of the pipe blank is relieved; fourthly, an upper pressing block and a lower pressing mold are assembled on a pressure machine; fifthly, the upper pressing block descends to perform mold assembly; sixthly, under the joint action of mechanical pressure of the mold and hydraulic pressure of an inner cavity of a variable-cross-section round pipe, mold attaching is carried out, the variable-cross-section round pipe is formed into the variable-cross-section special-shaped pipe, and the forming process is finished; and seventhly, the internal pressure of the variable-cross-section special-shaped pipe is relieved, and the variable-cross-section special-shaped pipe is cut, so that the variable-cross-section special-shaped pipe meeting the design requirement is obtained. The method is used for forming the variable-cross-section special-shaped pipe.

Description

technical field [0001] The invention relates to a forming and manufacturing method of metal pipe fittings, in particular to a hydroforming method for manufacturing variable cross-section pipe fittings, in particular to a method of filling hydraulic forming of pipe fittings in which both the circumference and shape of the section change, and belongs to pipe forming field of manufacturing technology. Background technique [0002] Energy saving and emission reduction has become the main trend of the current manufacturing industry, and lightweight is one of the main means for automobiles to save fuel and reduce exhaust emissions. The main ways to achieve lightweight include the use of lightweight materials and light-weight structures. For a structure with a certain material, the main method of lightweight is to design and manufacture a light-weight structure with a reasonable geometric shape. Internal high pressure forming technology is an advanced process method for manufactur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D35/00B21D26/033B21D11/06
CPCB21D11/06B21D26/033B21D35/00
Inventor 苑世剑贺久强韩聪
Owner HARBIN INST OF TECH
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