A clamping device suitable for high temperature and high pressure expansion test of metal sheets

Abstract

The present invention relates to a clamping device suitable for high-temperature and high-pressure bulging test of metal sheets. The device comprises: a pressure cover, a clamping pressure ring, a sample support body and a base plate; the clamping pressure ring is threadedly connected to one end of the sample support body; the pressure cover is buckled on the clamping pressure ring, and the pressure cover is threadedly connected to the clamping pressure ring; the other end of the sample support body is fixedly connected to the base plate; the clamping pressure ring is used to press the experimental sample onto the sample support body. The device provided by the present invention only comprises a pressure cover, a clamping pressure ring, a sample support body and a base plate. The device structure is relatively simple, and each component is threadedly connected, which is easy to disassemble and can improve the convenience of measurement. Furthermore, the pressure cover is used for sample deformation measurement, which can achieve decompression and guided discharge of the pressure medium after the sample bursts, thereby meeting the requirements of high-temperature bulging test conditions.

Description

Technical Field

[0001] The invention relates to the technical field of experimental devices, in particular to a clamping device suitable for high-temperature and high-pressure bulging tests of metal sheets. Background Art

[0002] The high-temperature performance of materials is one of the important mechanical performance indicators of materials. It is a key indicator for material selection, mechanical design, manufacturing, life assessment and life extension analysis of high-temperature equipment or high-temperature components in the fields of aerospace, nuclear power, large-scale petrochemical industry, etc. The high-temperature bulging test method has low sampling requirements and can be tested with small metal sheets. It is particularly suitable for life assessment and life extension analysis of high-temperature equipment or high-temperature components. In order to ensure the accuracy and reproducibility of the test results, the high-temperature bulging test has relatively high requirements for the clamping device of the test piece fixture. It is required not to affect the measurement of bulging deformation, but also to be able to mitigate the instantaneous explosion of high-temperature and high-pressure media. Therefore, it is of key significance to design a clamping device with a simple structure, convenient measurement, and suitable for high-temperature and high-pressure bulging test of metal sheets. Summary of the invention

[0003] The purpose of the present invention is to provide a clamping device which has a simple structure and is convenient for measurement and is suitable for a high-temperature and high-pressure bulging test of a metal sheet.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A clamping device suitable for high-temperature and high-pressure bulging test of metal sheets, comprising: a gland, a clamping ring, a sample support and a base plate;

[0006] The clamping ring is threadedly connected to one end of the sample support; the pressure cover is buckled on the clamping ring, and the pressure cover is threadedly connected to the clamping ring; the other end of the sample support is fixedly connected to the base plate; the clamping ring is used to press the experimental sample onto the sample support.

[0007] Preferably, the gland includes: a first light-transmitting hole, a second light-transmitting hole and a pressure-relief hole;

[0008] The first light-transmitting hole and the second light-transmitting hole are both arranged on the top surface of the gland; the pressure-reducing and pressure-relieving hole is arranged on the side wall of the gland.

[0009] Preferably, a quartz glass sheet and a glass pressure ring are provided in the first light-transmitting hole and the second light-transmitting hole; the glass pressure ring fixes the quartz glass sheet in the first light-transmitting hole or the second light-transmitting hole by means of threaded connection.

[0010] Preferably, the thickness of the quartz glass sheet is not less than 2 mm.

[0011] Preferably, the glass pressing ring is a metal pressing ring.

[0012] Preferably, a quartz glass sheet and a glass pressure ring are provided in the first light-transmitting hole; the glass pressure ring fixes the quartz glass sheet in the first light-transmitting hole by threaded connection; a stabilizing pressure ring and a displacement guide rod are provided in the second light-transmitting hole;

[0013] The stabilizing pressure ring is threadedly connected to the second light-transmitting hole; and the displacement guide rod is placed in the stabilizing pressure ring.

[0014] Preferably, the sample support comprises: a support column, a support ring and a pipe;

[0015] One end of the support column is threadedly connected to the support ring; the support ring is threadedly connected to the clamping ring; the other end of the support column is fixedly connected to the base plate;

[0016] A cavity is provided in the support column, and the connecting pipe is placed in the cavity; one end of the connecting pipe is fixedly connected to the support ring; and the other end of the connecting pipe is fixedly connected to the base plate.

[0017] Preferably, the connecting pipe is a metal pipe.

[0018] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0019] The clamping device for high-temperature and high-pressure bulging test of metal sheets provided by the present invention only includes: a gland, a clamping ring, a sample support and a substrate, and the device structure is relatively simple. Each component is connected by a thread, which is convenient for disassembly and can improve the convenience of measurement. In addition, the gland is used for sample deformation measurement, which can achieve decompression and guided discharge of the pressure medium after the sample bursts, thereby meeting the requirements of high-temperature bulging test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of the structure of a clamping device suitable for a high-temperature and high-pressure bulging test of a metal sheet provided by the present invention;

[0022] Figure 2 The figure is a schematic diagram of laser interferometry measurement using the clamping device provided by the present invention.

[0023] Explanation of symbols:

[0024] 1-stabilizing pressure ring, 2-glass pressure ring, 3-quartz glass sheet, 4-pressure cover, 5-pressure relief hole, 6-clamping pressure ring, 7-experimental sample, 8-support ring, 9-support column, 10-scattering light path laser, 11-incident light path laser, 12-first light transmission hole, 13-second light transmission hole, 14-connecting pipe, 15-laser receiver, 16-beam combining prism, 17-imaging lens, 18-reflection light path laser, 19-laser generator, 20-laser beam splitter, 21-laser beam expander. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a clamping device which has a simple structure and is convenient for measurement and is suitable for a high-temperature and high-pressure bulging test of a metal sheet.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, the clamping device provided by the present invention is suitable for high-temperature and high-pressure bulging test of metal sheets, including: a pressure cover 4, a clamping pressure ring 6, a sample support (not shown in the figure) and a base plate (not shown in the figure).

[0029] The clamping ring 6 is threadedly connected to one end of the sample support. The pressure cover 4 is buckled on the clamping ring 6, and the pressure cover 4 is threadedly connected to the clamping ring 6. The other end of the sample support is fixedly connected to the base plate. The clamping ring 6 is used to press the experimental sample 7 onto the sample support.

[0030] In order to facilitate the laser incident measurement of sample deformation and the transmission of scattered laser light, the present invention further provides a first light-transmitting hole 12 and a second light-transmitting hole 13 on the above-mentioned gland 4. In addition, a pressure relief hole 5 is also provided on the gland 4 to reduce pressure and guide the discharge of the medium when the pressure medium is ejected after the sample is deformed and burst.

[0031] The first light-transmitting hole 12 and the second light-transmitting hole 13 are both arranged on the top surface of the pressure cover 4. The pressure relief hole 5 is arranged on the side wall of the pressure cover 4.

[0032] In order to perform experimental measurements under different test conditions, different structures can be installed in the first light-transmitting hole 12 and the second light-transmitting hole 13 provided in the present invention. For example, when measuring a metal test piece, in order to prevent the pressure medium from spraying out and damaging the laser generating device and the receiving device when the sample bursts, a quartz glass sheet 3 and a glass pressure ring 2 can be provided at the first light-transmitting hole 12 and the second light-transmitting hole 13. The glass pressure ring 2 fixes the quartz glass sheet 3 in the first light-transmitting hole 12 or the second light-transmitting hole 13 by threaded connection. That is, the glass pressure ring 2 is threadedly connected to the first and second light-transmitting holes 13 to press the quartz glass sheet 3. The quartz glass sheet 3 used in the present invention is generally circular, but not limited to this. It can also be set according to the actual shape of the light-transmitting hole. The thickness of the quartz glass sheet 3 is generally not less than 2 mm. In order to improve stability and increase impact resistance, the glass pressure ring 2 in the present invention is preferably a metal pressure ring.

[0033] When performing the displacement guide rod test, it is necessary to remove the quartz glass sheet 3 and the glass pressure ring 2 in the second light-transmitting hole 13, screw the stabilizing pressure ring 1 into the second light-transmitting hole 13 through a thread, and then insert the displacement guide rod into the center hole of the stabilizing pressure ring 1. One end of the displacement guide rod contacts the upper surface of the experimental sample 7, and the other end is connected to the displacement measuring device.

[0034] Furthermore, in order to improve the convenience of conducting experiments using the clamping device, the sample support body used in the present invention includes: a support column 9 , a support ring 8 and a pipe 14 .

[0035] One end of the support column 9 is threadedly connected to the support ring 8. The support ring 8 is threadedly connected to the clamping ring 6. The other end of the support column 9 is fixedly connected to the base plate.

[0036] The support column 9 is provided with a cavity, and the pipe 14 is placed in the cavity. One end of the pipe 14 is fixedly connected to the support ring 8. The other end of the pipe 14 is fixedly connected to the base plate. The pipe 14 is preferably a metal pipe.

[0037] The advantages of the clamping device provided by the present invention are described below based on the specific positional relationship of each component.

[0038] The support column 9 in the sample support body is a hollow structure with a pipe 14 passing through it. A support ring 8 is placed at the top of the support column 9. The outer periphery of the top is provided with a fastening thread for connecting the clamping ring 6. The lower end is provided with a fixed threaded hole for connecting the base. The connection method between the base and the support ring 8 can also be welding. The support ring 8 is placed at the top of the support column 9. The center of the bottom end of the support ring 8 is connected to the pipe 14, so that the pipe 14 can be used to test whether the pressure medium enters. The top of the support ring 8 has a roughness control requirement and is used to place the experimental sample 7. The experimental sample 7 is pressed against the top surface of the support ring 8 by the clamping ring 6. If necessary, the experimental sample 7 and the support ring 8 can be welded to enhance the sealing. The pipe 14 is a slender metal tube, which is connected to the central circular hole at the bottom of the support ring 8 by a conical thread or directly welded. The experimental sample 7 used is generally a circular thin sheet of metal with a thickness generally not exceeding 0.5mm. The upper surface has a roughness control requirement to improve the fit with the top surface of the support ring 8. The inner surface of the bottom end of the clamping ring 6 is provided with a threaded hole, which is threadedly connected and fixed with the top end of the support column. The inner surface of the top end of the clamping ring 6 is provided with a threaded hole, which is threadedly connected and fixed with the bottom end of the pressure cover 4.

[0039] During the experiment, the experimental sample 7 is placed on the top surface of the support ring 8, and is pressed between the bottom surface of the clamping ring 6 and the top surface of the support column 9 by the clamping ring 6 to prevent leakage of the test pressure medium entering from the bottom of the pipe 14. The gland 4 is fixed on the top of the clamping ring 6 by threads, and the top of the gland 4 has a hole, which can be used to install the quartz glass sheet 3 for laser measurement or the stabilizing ring 1 for displacement guide measurement. There are several small holes around the gland 4, which are used to reduce the pressure and guide the discharge of the pressure medium when the sample bursts.

[0040] like Figure 2As shown, when it is necessary to measure the full-field deformation of the deformation area of ​​the sample, the laser interference method is used. The laser generator 19 excites the laser, which is divided into two paths by the laser beam splitter 20: the incident light path laser 11 passes through the laser beam splitter 20, passes through the laser beam expander 21, passes through the high-temperature resistant quartz glass in the first light-transmitting hole 12, and is incident on the upper surface of the entire test area of ​​the experimental sample 7. The other path is projected to the beam-combining prism 16 as a reference light after being emitted from the surface of the laser beam splitter 20. The laser beam expander 21 can be added if necessary. On the upper surface of the experimental sample 7, the incident laser is scattered to form scattered lasers in different directions, a part of which (the scattered light path laser 10) passes through the quartz glass in the second light-transmitting hole 13, passes through the imaging lens 17, and is interfered and synthesized with the reference laser (i.e., the reflected light path laser 18) reflected from the other laser beam splitter 20 on the beam-combining prism 16, and the combined laser forms a characteristic image on the laser receiver 15 (CCD camera). The images collected by the CCD camera can be transmitted to the computer via a high-speed cable, and the characteristic images can be quickly analyzed and converted using special software to obtain the displacement deformation of each point in the measurement area on the surface of the sample. The three-dimensional model can be generated through the software's own tools to obtain the full-field deformation measurement results and form the relationship between the full-field deformation and time, which can be used for finite element stress analysis and other related purposes.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A clamping device suitable for high temperature and high pressure expansion test of metal sheets, characterized in that: include: Gland, clamping ring, sample support and base plate; The clamping pressure ring is threadedly connected to one end of the sample support; The pressure cover is buckled on the clamping ring, and the pressure cover is threadedly connected to the clamping ring; the other end of the sample support is fixedly connected to the base plate; the clamping ring is used to press the experimental sample onto the sample support; The gland comprises: a first light-transmitting hole, a second light-transmitting hole and a pressure-relief hole; The first light-transmitting hole and the second light-transmitting hole are both arranged on the top surface of the gland; the pressure-reducing and pressure-relieving hole is arranged on the side wall of the gland; A quartz glass sheet and a glass pressure ring are provided in the first light-transmitting hole and the second light-transmitting hole; the glass pressure ring fixes the quartz glass sheet in the first light-transmitting hole or the second light-transmitting hole by means of a threaded connection; A stabilizing pressure ring and a displacement guide rod are provided in the second light-transmitting hole; The stabilizing pressure ring is threadedly connected to the second light-transmitting hole; the displacement guide rod is placed in the stabilizing pressure ring; The sample support body comprises: a support column, a support ring and a pipe; One end of the support column is threadedly connected to the support ring; the support ring is threadedly connected to the clamping ring; the other end of the support column is fixedly connected to the base plate; The support column is provided with a cavity, and the connecting pipe is placed in the cavity; one end of the connecting pipe is fixedly connected to the support ring; and the other end of the connecting pipe is fixedly connected to the base plate; When measuring the full-field deformation of the deformation area of ​​the sample, the laser interference method is used. The laser generator excites the laser and is divided into two paths by the laser beam splitter: the incident light path laser passes through the laser beam splitter, passes through the laser beam expander, passes through the quartz glass in the first light-transmitting hole, and is incident on the upper surface of the entire test area of ​​the experimental sample; the other path is projected onto the beam-combining prism as a reference light after being emitted from the surface of the laser beam splitter; on the upper surface of the experimental sample, the incident laser is scattered to form scattered lasers in different directions, a part of which passes through the quartz glass in the second light-transmitting hole, passes through the imaging lens, and is interfered and synthesized with the reference laser reflected by the other laser beam splitter on the beam-combining prism, and the combined laser forms a characteristic image on the laser receiver; the characteristic image is quickly analyzed and converted to obtain the displacement deformation of each point in the measurement area on the upper surface of the experimental sample, and a three-dimensional model is generated, so as to obtain the full-field deformation measurement result and form the relationship between the full-field deformation amount and time.

2. The clamping device suitable for high temperature and high pressure expansion test of metal sheets according to claim 1 is characterized in that: The thickness of the quartz glass sheet is not less than 2 mm.

3. The clamping device suitable for high temperature and high pressure expansion test of metal sheets according to claim 2 is characterized in that: The glass pressing ring is a metal pressing ring.

4. The clamping device suitable for high temperature and high pressure expansion test of metal sheets according to claim 1 is characterized in that: The connecting pipe is a metal pipe.

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