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Simple tube hydro-bulging device and bulging method

A technology for hydraulic bulging and pipe, which is applied in the field of hydraulic bulging devices, can solve the problem that the pressure increase and the axial feed cannot be well matched, and achieve the effect of the best hydraulic bulging effect.

Inactive Publication Date: 2011-06-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in this method, the increase of the internal pressure of the liquid cannot be well matched with the axial feed, and a special forming device is required

Method used

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  • Simple tube hydro-bulging device and bulging method
  • Simple tube hydro-bulging device and bulging method
  • Simple tube hydro-bulging device and bulging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like Figure 4 As shown, will Figure 2(a)-Figure 2(b) One end of the two booster punches 1 shown passes through the Figure 3(a)-Figure 3(b) The feed punch 2 shown, the two are combined through the supporting screw 14 and nut 15 to ensure consistent coaxiality, and the coil spring 9 is set between the booster punch 1 and the feed punch 2 On the screw 14, the pressurization punch 1 and the feed punch 2 can realize relative movement, and the outer diameter of the feed punch 2 is equal to the outer diameter of the tube blank 4 to be bulged. Connect the other end of the booster punch 1 directly to the axial single-action device, and the axial single-action device provides a single axial force F to push the composite punch forward. When the feed punch 2 and the end of the tube blank 4 The tube blank 4 is sealed through its wedge-shaped end face 17, and then the liquid medium 6 is injected into the sealed mold cavity through the liquid filling hole 7 in the feed punch on o...

Embodiment 2

[0041] The difference from Example 1 is:

[0042] like Figure 5 As shown, will Figure 4 The mold 5 in the mold is changed into the mold of the hydraulic bulging box-shaped part cavity, because the bulging amount of the box-shaped part is small, the internal pressure required is small, so the booster head 12 is removed. Bundle Figure 4 The coil spring 9, the screw rod 14, and the nut 15 are replaced by a pneumatic spring 16, and the booster punch 1 and the feed punch 2 are connected with the pneumatic spring 16, and different gas pressures or different diameters and lengths in the pneumatic spring 16 are set. The piston rod can realize the adjustment of the bulging internal pressure and the axial feed, and realizes the same function as the coil spring 9 in the first embodiment. Repeat the operation of the method in Example 1 to obtain the hydraulic bulging box.

Embodiment 3

[0044] The difference from Example 1 is:

[0045] like Figure 6 As shown, will Figure 4 The mold 5 in the middle is changed into the mold of the hydraulic bulging step pipe fitting cavity, because the bulging amount of the step pipe fitting is large, the required internal pressure is large, so change the booster head 12 of large diameter. Bundle Figure 4 The helical spring 9 is replaced by a cylindrical helical extension spring 18, and the cylindrical helical extension spring 18 is connected between the booster head 12 and the booster punch 1, so that the booster punch 1 and the booster punch 1 are connected by the cylindrical helical extension spring 18. The feed punches 2 are connected, and by changing the type and length of the cylindrical helical tension spring 18, the adjustment of the bulging internal pressure and axial feed can be realized, and the realized function is the same as that of the helical spring 9 in the first embodiment. Repeat the operation of the me...

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PUM

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Abstract

The invention relates to the field of tube hydro-forming, specifically relates to a simple tube hydro-bulging device and a simple tube hydro-bulging method. The simple tube hydro-bulging device is characterized in that a composite punch is composed of a pressurized punch and a feed punch, the pressurized punch and the feed punch are connected by an elastic component and keep consistent coaxiality, one end of the pressurized punch passes through the feed punch and then extends to the cavity of a hydro-bulging mould, a relative motion is formed between the pressurized punch and the feed punch because of a speed difference, the outer diameter of the feed punch is equal to the outer diameter of a tube blank to be bulged in the cavity, the other end of the pressurized punch is directly connected to an axial single-acting device, and the inside of the cavity of the hydro-bulging mould is filled with a liquid medium. When the device and method disclosed by the invention are adopted, a differential double-acting mechanism of the composite punch is realized by the simple axial single-acting device, thereby realizing the tube hydro-bulging. The device and method disclosed by the invention can be implemented without providing special high pressure oil supply equipment, meanwhile, the device and method disclosed by the invention are simple in forming device, low in equipment cost, easy to control, good in formability, and low in requirements on application environments.

Description

Technical field: [0001] The invention relates to the field of pipe hydroforming, specifically a simple pipe hydraulic bulging device and bulging method, especially a hydraulic bulging device that can obtain internal high pressure required for pipe forming without providing special high-pressure oil source supply equipment and bulging methods. Background technique: [0002] Improving the performance of parts, reducing the weight of parts, and saving materials are the goals and development trends pursued by modern advanced manufacturing technology; The purpose of automobile lightweight is also an important research topic in the automobile manufacturing industry. In this context, in addition to the use of lightweight materials, THF (Tube Hydroforming), a tube hydraulic bulging technology that realizes lightweight components by "substituting space for solid", has also developed rapidly because it complies with the requirements of the times. The hydraulic bulging technology is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033
Inventor 程明张士宏徐勇王瑞雪张海渠
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI