Super-large thin-plate curved-surface part numerical-control hydro-mechanical deep-drawing forming method

A technology of liquid-filled deep drawing and curved surface parts, which is applied in the field of numerical control liquid-filled deep drawing forming of ultra-large thin plate curved surface parts. It can solve the problems such as difficulty in guaranteeing the forming quality of ultra-large thin plate materials, and achieve the effect of improving the forming ability.

Inactive Publication Date: 2017-10-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that it is difficult to ensure the forming quality of ultra-large thin plate materials, and proposes a numerically controlled liquid-filled deep-drawing forming method for ultra-large thin plate curved surface parts, which can significantly improve the forming performance of the sheet material and the forming quality of the parts

Method used

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  • Super-large thin-plate curved-surface part numerical-control hydro-mechanical deep-drawing forming method
  • Super-large thin-plate curved-surface part numerical-control hydro-mechanical deep-drawing forming method

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Embodiment 1

[0040] In this embodiment, the method is applied to the bottom of the rocket storage tank In the overall forming optimization of , the material used for the bottom of the box is 2219 aluminum alloy, the diameter of the blank is 7728 mm, and the thickness is 2 mm. The mechanical properties of the sheet are shown in Table 1 below.

[0041] Table 1

[0042]

[0043] The assembly diagram of the mold and sheet size used for forming is as follows figure 1 As shown (the unit is 1mm), the major semi-axis of the punch is 2497mm, the minor semi-axis is 2280mm, the diameter of the die opening is 5000mm, and the fillet radius of the die is 198mm.

[0044] Through CATIA modeling, and then imported into the special stamping forming simulation software DYNAFORM, by analyzing the forming conditions of the parts, determine the growth of blank holder force and hydraulic pressure required in each forming stage.

[0045] Through the set parameters, the range of the blank holder force of the...

Embodiment 2

[0050] In this embodiment, the method is applied to the bottom of the rocket storage tank In the overall forming optimization of , the material used for the bottom of the box is 5A06 aluminum alloy, the diameter of the blank is 5510 mm, and the thickness is 2 mm. The mechanical properties of the sheet are shown in Table 2 below.

[0051] Table 2

[0052]

[0053] The semi-major axis of the punch used for forming is 1672 mm, the semi-minor axis is 1393 mm, the diameter of the die mouth is 3350 mm, and the fillet radius of the die is 198 mm.

[0054] Through CATIA modeling, and then imported into the special stamping forming simulation software DYNAFORM, by analyzing the forming conditions of the parts, determine the growth of blank holder force and hydraulic pressure required in each forming stage.

[0055] Through the set parameters, the range of the blank holder force of the sheet is determined by the relevant formula: F b >2229kN.

[0056] According to the relationshi...

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Abstract

The invention relates to a numerically controlled liquid-filled deep-drawing forming method for ultra-large thin plate curved surface parts. According to the different characteristics of each forming stage of liquid-filled deep-drawing, the plate is subjected to liquid-filled drawing by means of an optimized combination of variable blank-holding force and variable hydraulic pressure. deep. Since the sheet metal is very prone to wrinkling and cracking when the relative thickness is very small, because the blank-holding force and hydraulic pressure required for the sheet metal in the forming stage are not the same, this method is used to analyze the blank-holding force and hydraulic pressure at different forming stages. The hydraulic pressure is controlled to avoid wrinkling and cracking during the forming process of the ultra-large sheet. This method greatly improves the forming ability of ultra-large thin plates and the forming quality of parts. And through optimization, the optimal variable blank holder force and variable hydraulic pressure loading curves are obtained. Thereby, the liquid-filled deep drawing process of the ultra-large thin plate is completed.

Description

technical field [0001] The invention relates to a numerically controlled hydraulic forming technology for plates, in particular to a numerically controlled liquid-filled deep-drawing forming method for super-large thin plate curved surface parts. Background technique [0002] In the process of liquid-filled deep drawing of sheet metal, blank holder force and hydraulic pressure are two important process parameters that affect the success or failure of forming and the quality of forming. Appropriate blank holder force can form parts that are not wrinkled or cracked, and appropriate hydraulic pressure can not only increase the drawing limit, but also improve the uniformity of wall thickness distribution, improve the forming quality of the surface, and ensure that the formed parts have high forming accuracy. [0003] Ultra-large thin plates have the characteristics of large size and thin thickness. For plates with relatively small thickness, forming is very difficult, and wrink...

Claims

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Application Information

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IPC IPC(8): B21D26/027B21D26/031
CPCB21D26/027B21D26/031
Inventor 雷君相彭彦君江鸿
Owner UNIV OF SHANGHAI FOR SCI & TECH
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