Multifunctional testing device for high-temperature compression creep / press-in creep performance

Abstract

The invention provides a high-temperature compression creep / press-in creep performance multifunctional testing device which comprises a Rockwell hardness tester, a heating and heat preservation component, a displacement measuring component and a control terminal, the Rockwell hardness tester comprises a pressure head fixing groove, a compression pressure head or a press-in pressure head is mounted in the pressure head fixing groove, a mounting hole is formed in the side wall of the pressure head fixing groove, and the pressure head fixing groove is connected with the heating and heat preservation component. The heating and heat preservation component comprises an oil cup and a heating furnace, the heating furnace is located on a lifting platform of the Rockwell hardness tester, the oil cup is located in the heating furnace, the displacement measuring component comprises a displacement rod, a dial indicator and a fixed support, one end of the displacement rod is inserted into the mounting hole, the fixed support is mounted on a rack of the Rockwell hardness tester, and the dial indicator is connected with the fixed support. A probe of the dial indicator abuts against the lower portion of the other end of the displacement rod and is perpendicular to the displacement rod, and the control terminal is connected with the heating furnace and the dial indicator. According to the invention, different pressure heads can be replaced for different performance tests, the construction is simple, and the cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of hardness testing equipment and provides a multifunctional testing device for high-temperature compression creep / intrusion creep performance. Background Art

[0002] Nonferrous alloys such as aluminum and magnesium alloys are currently the most widely used lightweight structural materials, widely used in industries such as aerospace, rail transportation, and petrochemicals. Structural components are subjected to the long-term coupling of high stress and high temperature, resulting in creep deformation that poses a significant risk to their safe service life. Accurately evaluating the service life and remaining life of workpieces subjected to high-temperature service is crucial to their safe service life.

[0003] In order to measure compression creep deformation and intrusion creep deformation, a dedicated high-temperature creep testing machine or nanoindenter is used to perform compression creep performance or intrusion creep performance tests. High-temperature creep testing machines or nanoindenters have complex structural compositions. The core parts require special materials such as high-temperature alloys, diamonds, and piezoelectric ceramics, as well as ultra-precision processing technology. The technical threshold for high-precision sensors and real-time feedback complex control algorithms is high. Long-term operation (creep test) or sub-nanometer repeatability (indenter) requires high equipment stability. High temperature or vacuum environment and vibration isolation devices and other systems lead to high overall equipment costs. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a high-temperature compression creep / intrusion creep performance multifunctional testing device, which can replace different indenters to perform different performance tests, and is simple to build and low in cost.

[0005] The technical solution of the present invention includes: The Rockwell hardness tester comprises an indenter fixing groove, in which a compression indenter or a press-in indenter is installed, and a mounting hole is provided on a side wall of the indenter fixing groove.

[0006] The heating and insulation component includes an oil cup and a heating furnace. The heating furnace is located on the lifting platform of the Rockwell hardness tester. The oil cup is located in the heating furnace. The oil cup is used to hold the heating liquid. The sample is located in the heating liquid and is located directly below the compression head or the indentation head.

[0007] The displacement measuring component includes a displacement rod, a dial indicator and a fixed support. One end of the displacement rod is inserted into the mounting hole, and the movement direction of the displacement rod is perpendicular to the indenter fixing groove. The fixed support is installed on the frame of the Rockwell hardness tester. The dial indicator is connected to the fixed support. The probe of the dial indicator is in contact with the bottom of the other end of the displacement rod, and the probe of the dial indicator is perpendicular to the displacement rod.

[0008] The control terminal is connected to the heating furnace and the dial indicator respectively.

[0009] Furthermore, an anvil is provided in the oil cup, and the sample is located on the anvil.

[0010] Furthermore, the displacement rod is arranged horizontally, and the probe of the micrometer is perpendicular to the displacement rod.

[0011] Furthermore, a protective cover is provided outside the heating furnace.

[0012] Furthermore, a heat insulating material is filled between the protective cover and the heating furnace.

[0013] Furthermore, the fixed support includes a base and a universal rod, the base is installed on the frame of the Rockwell hardness tester, one end of the universal rod is connected to the base, and the other end is connected to the dial indicator.

[0014] Furthermore, the side of the compression head in contact with the sample is a plane, and the plane covers the upper end surface of the sample.

[0015] Furthermore, the side of the indenter in contact with the sample is a cylindrical protrusion, and the area of the upper end surface of the sample is 25 to 100 times the area of the end surface of the cylindrical protrusion.

[0016] Furthermore, a plane is provided on the side wall of one end of the displacement rod away from the pressure head fixing groove, and the plane faces downward, and the probe of the micrometer abuts against the plane.

[0017] Furthermore, a temperature sensor is provided in the oil cup, and the temperature sensor is connected to the control terminal.

[0018] The technical solution provided by the embodiment of the present invention has the following advantages compared with the existing technology: During the test, if compression creep is detected, a compression indenter is selected; if insertion creep is detected, an insertion indenter is selected. After the compression / insertion indenter is selected, it is installed in the indenter fixing slot, the oil cup is placed in a heating furnace, and the heating furnace is placed on the lifting platform of the Rockwell hardness tester. Heating liquid is added to the oil cup, and the sample is removed from the oxide layer and placed in the heating liquid, with the sample located directly below the compression / insertion indenter. The Rockwell hardness tester screw handle is rotated to make the compression / insertion indenter abut against the upper end face of the sample, and then the micrometer is adjusted so that the probe abuts against the other end of the displacement rod. The control terminal controls the heating of the heating furnace to heat the heating liquid to the test temperature, and finally the loading load of the Rockwell hardness tester is selected, so that the micrometer measures the downward displacement of the displacement rod. Compared with the prior art, the present invention uses the Rockwell hardness tester as the loading mechanism, does not require a separate detection device, reduces costs, and can perform different performance tests by simply replacing different indenters.

[0019] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0021] Figure 1 A schematic diagram of the structure of a test device according to one embodiment of the present invention Figure 1 .

[0022] Figure 2 A schematic diagram of the structure of a test device according to one embodiment of the present invention Figure 2 .

[0023] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0024] Figure 4 This is a schematic diagram of the compression head structure of one embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the pressing head according to one embodiment of the present invention.

[0026] Figure 6 FIG. 1 is a displacement-time curve of compression creep according to one embodiment of the present invention.

[0027] Figure 7 FIG. 1 is a displacement-time curve of indentation creep according to one embodiment of the present invention.

[0028] Figure 8 A schematic diagram of the displacement rod structure of one embodiment of the present invention Figure 1 .

[0029] Figure 9 A schematic diagram of the displacement rod structure of one embodiment of the present invention Figure 2 .

[0030] Reference numerals: 1. Rockwell hardness tester; 2. Indenter fixing slot; 3. Oil cup; 4. Heating furnace; 5. Lifting platform; 6. Screw rotation handle; 7. Displacement rod; 8. Micrometer; 9. Base; 10. Universal rod; 11. Anvil; 12. Protective cover; 13. Insulation material; 14. Compression indenter; 15. Press-in indenter; 16. Control terminal; 17. Temperature sensor; 18. Load knob; 19. Weight; 20. Load lever. DETAILED DESCRIPTION

[0031] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In the description of the embodiments of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0034] like Figures 1 to 9 As shown, the present invention provides a multifunctional testing device for high-temperature compression creep / intrusion creep performance, comprising: The Rockwell hardness tester 1 comprises an indenter fixing groove 2 , in which a compression indenter 14 or a press-in indenter 15 is installed. A mounting hole is provided on a side wall of the indenter fixing groove 2 .

[0035] The heating and insulation component includes an oil cup 3 and a heating furnace 4. The heating furnace 4 is located on the lifting platform 5 of the Rockwell hardness tester 1. The oil cup 3 is located in the heating furnace 4. The oil cup 3 is used to hold the heating liquid. The sample is located in the heating liquid, and the sample is located directly below the compression head 14 or the insertion head 15.

[0036] The displacement measuring component includes a displacement rod 7, a micrometer 8 and a fixed support. One end of the displacement rod 7 is inserted into the mounting hole, and the displacement rod 7 is perpendicular to the movement direction of the indenter fixing groove 2. The fixed support is installed on the frame of the Rockwell hardness tester 1. The micrometer 8 is connected to the fixed support. The probe of the micrometer 8 is in contact with the bottom of the other end of the displacement rod 7, and the probe of the micrometer 8 is perpendicular to the displacement rod 7.

[0037] The control terminal 16 is connected to the heating furnace 4 and the dial gauge 8 respectively.

[0038] During testing, if compression creep is to be detected, a compression indenter 14 is selected; if insertion creep is to be detected, an insertion indenter 15 is selected. After the compression / insertion indenter 15 is selected, it is installed in the indenter fixing slot 2. The oil cup 3 is placed in the heating furnace 4, which is then placed on the lifting platform 5 of the Rockwell hardness tester 1. Heating liquid is added to the oil cup 3. The sample is then removed from its oxide layer and placed in the heating liquid, with the sample positioned directly below the compression / insertion indenter 15. The Rockwell hardness tester 1 screw handle 6 is rotated to bring the compression / insertion indenter 15 into contact with the upper end surface of the sample. The micrometer indicator 8 is then adjusted to bring the probe into contact with the lower end of the displacement rod 7. The control terminal 16 controls the heating furnace 4 to heat the heating liquid to the test temperature. Finally, the loading load of the Rockwell hardness tester 1 is selected, and the micrometer indicator 8 measures the downward displacement of the displacement rod 7. Compared to the prior art, the present invention uses the Rockwell hardness tester 1 as the loading mechanism, eliminating the need for a separate detection device, reducing costs, and simply replacing different indenters allows for different performance tests.

[0039] Furthermore, according to actual needs, a standard weight 19 can be added to the Rockwell hardness tester 1. In this way, the Rockwell hardness tester 1 is the main loading mechanism. The loading mechanism and the additional standard weight 19 ensure that the load of the multifunctional creep testing machine is stable and accurate, and the load adjustment of the Rockwell hardness tester 1 is simple and easy to operate.

[0040] Furthermore, the heating liquid is dimethyl silicone oil.

[0041] Furthermore, the heating furnace 4 utilizes a resistance wire protected by an insulating ceramic tube for heating. The internal oil cup 3 is used to heat the specimen and maintain a stable test temperature. The resistance wire heats the dimethyl silicone oil within the internal oil cup 3. The non-volatility and insulating properties of dimethyl silicone oil ensure stable and safe test temperatures. A temperature compensator connected via a thermocouple monitors the specimen temperature, ensuring accurate and stable test temperatures.

[0042] Furthermore, the micrometer 8 is a capacitive micrometer 8, which is connected to the control terminal 16 via an A / D converter. The capacitive micrometer 8 collects creep deformation displacement data and stores the data in real time in the form of a database through the control terminal 16.

[0043] In the embodiment provided by the present invention, an anvil 11 is provided in the oil cup 3 , and the sample is located on the anvil 11 .

[0044] In the embodiment provided by the present invention, the displacement rod 7 is arranged horizontally, and the probe of the micrometer 8 is perpendicular to the displacement rod 7 .

[0045] In the embodiment provided by the present invention, a protective cover 12 is provided outside the heating furnace 4. A heat insulating material 13 is filled between the protective cover 12 and the heating furnace 4, and the heat insulating material 13 is preferably asbestos.

[0046] In the embodiment provided by the present invention, the fixed support includes a base 9 and a universal rod 10. The base 9 is installed on the frame of the Rockwell hardness tester 1. One end of the universal rod 10 is connected to the base 9, and the other end is connected to the micrometer 8.

[0047] Since the size of the sample tested each time is different, the position of the displacement rod 7 is also different. It is necessary to adjust the position of the dial indicator 8 before each test to ensure the accuracy of the measurement results. The universal rod 10 can flexibly adjust the position of the dial indicator 8.

[0048] In the embodiment provided by the present invention, the side of the compression head 14 that contacts the sample is a flat surface that covers the upper end surface of the sample. The side of the indentation head 15 that contacts the sample is a cylindrical protrusion, and the area of the upper end surface of the sample is 25 to 100 times the area of the cylindrical protrusion.

[0049] The compression ram 14 or the press-in ram 15 can be made of hardened steel or cemented carbide, and its size is determined by the test load requirement and the weight of the loading weight 19.

[0050] In the embodiments provided by the present invention, Figure 8 and Figure 9 As shown, a plane is provided on the side wall of one end of the displacement rod 7 away from the pressure head fixing groove 2, and the plane faces downward, and the probe of the micrometer 8 abuts against the plane to avoid the gap between the probe and the plane affecting the detection result.

[0051] In the embodiment provided by the present invention, a temperature sensor 17 is provided in the oil cup 3 , and the temperature sensor 17 is connected to the control terminal 16 .

[0052] Furthermore, the temperature sensor 17 is a thermocouple, which is connected to a temperature compensator to monitor the sample temperature and ensure the accuracy and stability of the test temperature.

[0053] The working principle is: Prepare the specimen into a cylindrical shape with a size of Φ10×10 mm and polish the end surface of the cylindrical specimen to remove the oxide scale. Pour dimethyl silicone oil into the oil cup 3. The amount of dimethyl silicone oil added should ensure that the creep specimen is in the middle area of the dimethyl silicone oil.

[0054] Install the displacement rod 7 in the pressure head fixing groove 2, adjust the universal rod 10 so that the plane of the outer end of the displacement transmission rod contacts the probe of the micrometer 8, and ensure that the micrometer 8 is basically vertical.

[0055] Asbestos is packed between the heating furnace 4 and its external protective cover 12 to ensure stable heating. The power switch of the resistance heating furnace 4 is turned on, and the test target temperature is set through the control terminal 16. The heating furnace 4 heats the dimethyl silicone oil to the target temperature and maintains it for 15 minutes. The sample temperature is measured using a thermocouple, and temperature compensation is performed using a temperature controller to ensure that the actual sample temperature is consistent with the test temperature.

[0056] The sample should be placed on the axis of the anvil 11 in the middle of the oil cup 3 to ensure that the compression / indentation head 15 can act on the center area of the sample. Turn the hardness tester screw and rotate the handle 6 to lift the lifting platform 5 through the screw until the sample surface contacts the compression / indentation head 15. The height of the lifting platform 5, the size of the anvil 11 and the sample can be used to determine the height. When the lifting platform 5 is adjusted, the micrometer 8 is reset after the sample surface contacts the compression / indentation head 15. The test load is adjusted by the load knob 18. The hardness tester weight 19 and the external standard weight 19 can be matched through the Rockwell hardness tester 1 of the hardness tester, and act on the compression / indentation head 15 through the load lever 20.

[0057] When performing compression creep performance testing, a compression head 14 with a cross-sectional size larger than the sample cross-sectional size is used to perform the test to ensure that the sample cross-sectional area is uniformly stressed. The measurement results are as follows: Figure 5 As shown. The test load is determined by the mass of the hardness tester weight 19 and the external standard weight 19, as well as the specimen cross-section. For nonferrous alloy specimens, the compression indenter 14 can be made of hardened high-quality carbon steel; for conventional steel specimens, it is made of cemented carbide. The specific dimensions are determined by the test requirements. The fixed end of the compression indenter 14 is machined to the dimensions of the Rockwell hardness tester indenter to ensure proper installation of the creep indenter.

[0058] When performing the indentation creep performance test, the indentation head 15 is used for the test, and the measurement results are as follows: Figure 6 As shown in the figure, the test load is determined by the mass of the hardness tester weight 19 and the external standard weight 19, as well as the dimensions of the indenter 15. The indenter 15 can be made of cemented carbide, and its dimensions are determined by the test requirements. The fixed end of the indenter 15 is machined to the dimensions of the Rockwell hardness tester indenter to ensure proper installation of the creep indenter.

[0059] During the process of loading to the target test stress, data acquisition is started on the control terminal 16. The data is recorded by the control terminal 16 via the micrometer 8 and the A / D converter to record the real-time creep deformation, thereby obtaining a curve of the relationship between the creep deformation and time, and a curve of the relationship between the creep strain and time is obtained by calculation.

[0060] The test can be suspended or stopped at any time according to the test requirements and actual conditions. Data acquisition should be stopped on the control terminal 16 first, and data storage should be performed, and the test load can be unloaded by adjusting the screw rotation handle 6.

[0061] After the test is completed, the power switch of the heating furnace 4 is turned off, the sample is taken out, and the control terminal 16 is closed.

[0062] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0063] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and exemplary embodiments. They can be applied to a variety of fields suitable for the present invention. Further modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims

1. A multifunctional testing device for high temperature compression creep / intrusion creep performance, characterized in that: include: A Rockwell hardness tester (1) comprises an indenter fixing groove (2), wherein a compression indenter (14) or a press-in indenter (15) is installed in the indenter fixing groove (2), and a mounting hole is provided on a side wall of the indenter fixing groove (2); A heating and heat-insulating component comprises an oil cup (3) and a heating furnace (4), wherein the heating furnace (4) is located on a lifting platform (5) of a Rockwell hardness tester (1), and the oil cup (3) is located in the heating furnace (4). The oil cup (3) is used to hold a heating liquid, and the sample is located in the heating liquid, and the sample is located directly below a compression head (14) or an insertion head (15); A displacement measuring component, comprising a displacement rod (7), a micrometer (8) and a fixed support, wherein one end of the displacement rod (7) is inserted into the mounting hole, and the movement direction of the displacement rod (7) is perpendicular to the indenter fixing groove (2), the fixed support is mounted on the frame of the Rockwell hardness tester (1), the micrometer (8) is connected to the fixed support, the probe of the micrometer (8) is in contact with the lower side of the other end of the displacement rod (7), and the probe of the micrometer (8) is perpendicular to the displacement rod (7); The control terminal (16) is connected to the heating furnace (4) and the dial gauge (8) respectively.

2. A multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: An anvil (11) is provided in the oil cup (3), and the sample is located on the anvil (11).

3. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: The displacement rod (7) is arranged horizontally, and the probe of the micrometer (8) is perpendicular to the displacement rod (7).

4. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: A protective cover (12) is provided outside the heating furnace (4).

5. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 4, characterized in that: A heat insulating material (13) is filled between the protective cover (12) and the heating furnace (4).

6. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: The fixed support comprises a base (9) and a universal rod (10), wherein the base (9) is mounted on a frame of the Rockwell hardness tester (1), and one end of the universal rod (10) is connected to the base (9), and the other end is connected to the micrometer (8).

7. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: The side of the compression head (14) in contact with the sample is a plane, and the plane covers the upper end surface of the sample.

8. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: The side of the indenter (15) in contact with the sample is a cylindrical protrusion, and the area of the upper end surface of the sample is 25 to 100 times the area of the end surface of the cylindrical protrusion.

9. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: A plane is provided on the side wall of one end of the displacement rod (7) away from the pressure head fixing groove (2), and the plane faces downward, and the probe of the micrometer (8) abuts against the plane.

10. The multifunctional testing device for high temperature compression creep / intrusion creep performance according to claim 1, characterized in that: A temperature sensor (17) is provided in the oil cup (3), and the temperature sensor (17) is connected to the control terminal (16).

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