Device and method for testing forming property of sheet material under effect of fluid pressure

Abstract

The invention provides a device and a method for testing the forming property of a sheet material under the effect of fluid pressure, belongs to the field of a sheet material hydraulic forming technology, and aims at the problems that in a conventional sheet material forming property test, real-time testing and accurate evaluation can not be hardly carried out under a fluid pressurizing condition, and dynamic sealing is hard to carry out under a fluid high-pressure condition due to that a sheet material test sample is provided a non-circular section. The technical points are as follows: an end cover is matched with clamping pieces in a manner of adopting a piston cylinder; a connection region of the upper and lower clamping pieces is connected with the sheet material test sample in a manner of adopting a cylindrical pin; and the testing method sequentially comprises the following steps of: placing a test sample, combining a testing device, connecting a tester, applying hydraulic pressure and downwards moving a lower chuck, taking out the cut test sample and carrying out size measurement. The matching by adopting the piston cylinder manner can enable the sheet material test sample with a rectangular section to realize the fluid high-pressure dynamic sealing; and a simplified structure design of the device can enable the the hydraulic pressure in a cavity and the sheet material extension rate to be independently and accurately controlled. By using the device and the method disclosed by the invention, shape and size diversified forming property tests on the sheet material test sample can be realized.

Description

technical field

[0001] The invention relates to a device and a method for testing the formability of a plate, in particular to a device and a method for testing the formability of a plate under the action of fluid pressure, and belongs to the technical field of plate hydroforming. Background technique

[0002] With the rapid development of aerospace and automotive fields, the use of lightweight materials such as aluminum alloys, magnesium alloys, and titanium alloys is an important means to achieve weight reduction from the material approach. Especially in the field of aerospace, the vast majority of plate parts with complex shapes represented by fairings are made of lightweight materials such as aluminum-magnesium alloys. However, the contradictions of poor formability and low plasticity of these materials compared with conventional deep-drawing steels at room temperature have become the bottleneck of their processing and forming. Therefore, sheet hydroforming technology, ...

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