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Method for determining thermoforming limit curve of titanium alloy sheet

A technology of limit curve and measurement method, which is applied in the preparation of test samples and the application of stable tension/pressure to test the strength of materials. and other problems to achieve the effect of high pressure and improved accuracy

Active Publication Date: 2018-11-06
YANSHAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of the method, the clarity of the grid will be affected under high temperature conditions, and the accuracy of subsequent strain analysis will be difficult to guarantee
[0005] In summary, the main reasons why the existing test methods for obtaining forming limit curves are difficult to implement under high temperature conditions can be attributed to the following two points: one is that it is difficult to realize the loading methods of different strain paths under high temperature conditions; It is difficult to guarantee the accuracy of strain measurement

Method used

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  • Method for determining thermoforming limit curve of titanium alloy sheet
  • Method for determining thermoforming limit curve of titanium alloy sheet
  • Method for determining thermoforming limit curve of titanium alloy sheet

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preparation example Construction

[0045] In the present invention, there is no special limitation on the preparation method of the pressure transmission medium, which can be prepared by the preparation method of the composition well known to those skilled in the art.

[0046] The present invention preheats the pretreated alloy plate, the pressure transmission medium and the mold respectively through the hot forming limit curve measuring device, and the preheating temperatures of the pretreated alloy plate, the pressure transmission medium and the mold are independently 600-900° C.; The mold is an elliptical bulging mold, the diameter of the major axis of the mold is 100 mm, and the diameter of the minor axis is 100, 90, 80, 60 and 40 mm, respectively. In the present invention, the preheating temperature rise rate of the pretreated alloy plate, the pressure transmission medium and the mold is preferably 5-10° C. / min independently.

[0047] figure 1 The structural representation of the mold used for the present...

Embodiment 1

[0057] Several Ti-6Al-4V titanium alloy disc specimens with a diameter of 180 mm and a thickness of 1 mm were prepared, and speckle materials were used to spray black and white speckles on one surface of the specimens, and the speckles covered the entire surface.

[0058] Preparation of pressure transmission medium: Zirconia ceramic balls and boron nitride with a particle size of 0.05mm, 0.1mm, and 0.2mm are selected as the pressure transmission medium, and the pressure transmission medium of the following specifications is prepared: ①Zirconium oxide with a volume ratio of 9:1 Ceramic balls (0.1mm particle size) and boron nitride, ②Zirconium oxide ceramic balls (0.3mm particle size) and boron nitride with a volume ratio of 9:1, ③Zirconium oxide ceramic balls with a volume ratio of 9:1 (particle size is 0.5mm) and boron nitride, ④ zirconia ceramic balls with a volume ratio of 8:2 (particle size is 0.1mm) and boron nitride, ⑤ zirconia ceramic balls with a volume ratio of 8:2 (par...

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Abstract

The invention provides a method for determining a thermoforming limit curve of a titanium alloy sheet, and belongs to the field of alloy forming limit curve measurement. According to the method, silicon nitride ceramic balls and molybdenum disulfide are used as a pressure transmitting medium, the advantage of high temperature resistance is achieved, higher pressure can be achieved, and the methodcan be used for a wider temperature range. Different strain loading paths in a double-stretching strain zone are achieved by changing the pressure transmitting medium composition and a mold. The strain measurement during the deformation of the alloy sheet is achieved by the online visual measurement technology, and a forming limit curve test acquisition method of the alloy sheet in the wider temperature range, more loading paths and more precise strain measurement conditions is achieved by means of the combination of the above three points.

Description

technical field [0001] The invention relates to the technical field of alloy forming limit curve measurement, in particular to a method for measuring the hot forming limit curve of a titanium alloy plate. Background technique [0002] In the fields of aerospace and automobile manufacturing, the application of high-strength metal alloy sheets (aluminum alloy sheets, magnesium alloy sheets, titanium alloy sheets, etc.) has become one of the main ways to achieve lightweight components and ensure sufficient strength. However, high-strength plates have poor plastic deformation ability at room temperature, and it is difficult to obtain parts with complex shapes through stamping. Therefore, the plastic processing of this type of sheet often needs to be carried out under high temperature conditions, ranging from 200°C to 300°C and as high as close to 1000°C. How to obtain the forming limit curve under high temperature conditions to evaluate the maximum forming ability of this type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/18
CPCG01N1/28G01N3/18
Inventor 杨卓云赵长财孙宇飞陈志伟董国疆
Owner YANSHAN UNIV