Sample holder for measuring micro Vickers hardness and application method

Abstract

The invention discloses a sample holder for measuring micro Vickers hardness and an application method.The sample holder comprises an outer cover sample cavity and a sample holder body movably connected with the outer cover sample cavity, the sample holder body comprises a rotatable seat and an ejector rod fixedly arranged on the rotatable seat, the outer cover sample cavity is internally detachably connected with a sample cavity, and the ejector rod is fixedly arranged on the rotatable seat. The sample cavity comprises a stepped columnar hole cavity, the stepped columnar hole cavity is divided into a first cavity and a second cavity integrally formed with the first cavity, the first cavity is communicated with the second cavity, a limiting piece is movably arranged on the outer cover sample cavity, a round hole channel is formed in the center of the limiting piece, and the round hole channel is communicated with the first cavity. The micro Vickers hardness detection device is suitable for sample micro Vickers hardness detection of the full-automatic phase change instrument, the structure is simple, the design is reasonable, and the accuracy of micro Vickers hardness measurement is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material engineering, and in particular relates to a sample holder for measuring micro-Vickers hardness and an application method thereof. Background Art

[0002] In the process of measuring the C curve of steel using a fully automatic phase change instrument, it is often necessary to perform metallographic microstructure analysis and microhardness measurement of different tissues on the sample to assist in drawing the curve. The sample used in the phase change instrument is a cylindrical sample. Because the sample is too small, it is currently ground after being clamped by a fixture. However, the corrosive agent during the etching of the sample is easily gathered in the gap between the fixture and the metal sample. When the sample is placed under an inverted microscope for observation, the liquid in the gap seeps out, making it difficult to find a clean observation field on the already small observation section. Therefore, the sample needs to be removed from the fixture, the microstructure morphology is observed first, and then the micro-Vickers hardness of the sample is measured. When measuring the micro-Vickers hardness, the sample needs to be placed on the hardness tester stage with the observation section facing up and the opening surface of the sample facing down. Since the contact surface between the sample and the hardness tester workbench is very small, when the measurement position is at the edge of the sample, the sample is prone to tilt or even fall under a certain load, causing measurement deviation.

[0003] Patent No. (CN 109855998 A) discloses a sample preparation device for microscopic Vickers hardness analysis. This device requires the sample to be placed in a base for hot mounting before direct measurement. This device will contaminate the surface of the prepared metallographic sample during operation and is not suitable for already ground metallographic samples.

[0004] Patent No. (CN203949824U) discloses a universal fixture for a micro Vickers hardness tester, which uses four positioning pins to pass through positioning holes to fix the sample to be tested in the cavity. The positioning pins must have sufficient contact surface with the sample to be tested to firmly fix the sample, and are not suitable for cylindrical metallographic specimens with smaller diameters.

[0005] Patent No. (CN 115452519 A) discloses a method for preparing a microscopic Vickers hardness specimen, which uses cold mounting and hot mounting to process the specimen. The operation is cumbersome, and the mounting agent and the metal specimen have different hardnesses. After grinding, a very small gap will be formed between the sample and the mounting resin. After corrosion, the corrosion liquid cannot be avoided from entering, resulting in contamination of the sample detection surface, which is not conducive to microscopic observation and measurement.

[0006] In view of the above factors, a sample holder and an application method for measuring micro-Vickers hardness are provided, which are suitable for micro-Vickers hardness detection of samples of a fully automatic phase change instrument, have a simple structure, a reasonable design, and improve the accuracy of micro-Vickers hardness measurement. Summary of the invention

[0007] The object of the present invention is to provide a sample holder for measuring micro-Vickers hardness and an application method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0008] The object of the present invention is achieved through the following technical solutions: a sample holder for measuring micro-Vickers hardness, comprising an outer cover sample cavity and a sample holder movably connected to the outer cover sample cavity, the sample holder comprising a rotatable seat and a mandrel fixed on the rotatable seat;

[0009] The sample chamber is detachably connected to the sample chamber in the outer cover, and the sample chamber includes a chamber with stepped columnar holes, which is divided into a first chamber and a second chamber integrally formed with the first chamber, and the first chamber is connected to the second chamber;

[0010] A limiting plate is movably arranged on the outer cover sample cavity, a circular hole channel is arranged at the center of the limiting plate, and the circular hole channel is opposite to the first chamber and is arranged coaxially.

[0011] Furthermore, the first chamber and the second chamber are in a hollow columnar structure, and the first chamber is gap-matched with a phase change instrument sample, and the diameter of the first chamber is 0.1 mm larger than the diameter of the sample used in the phase change instrument.

[0012] Furthermore, the inner wall of the first chamber is smoothly arranged, the second chamber is provided with an internal thread, and the second chamber is threadedly connected to the sample holder.

[0013] Furthermore, the second chamber is threadedly connected to a push rod fixed on the rotating seat, and an external thread is arranged on a circumferential wall of the push rod to cooperate with the second chamber.

[0014] Furthermore, after the rotating seat is screwed into the second chamber through the push rod, the upper and lower surfaces of the outer cover sample cavity remain horizontal.

[0015] Furthermore, the limiting piece is buckled on the end face of the outer cover sample cavity, the limiting piece is tightly fitted with the end face of the outer cover sample cavity, positioning plates are evenly arranged on the circumference of the limiting piece, and the positioning plates are fitted with the outer circumference of the outer cover sample cavity.

[0016] Furthermore, a connecting end is detachably arranged on the end surface of the push rod, and a plurality of the connecting ends are arranged.

[0017] Furthermore, the diameter of the connecting end is smaller than the diameter of the push rod.

[0018] Furthermore, the detachable connection between the outer cover specimen cavity and the sample cavity is a threaded connection.

[0019] An application method of a sample holder for measuring micro-Vickers hardness comprises the following steps;

[0020] The outer cover sample cavity is connected to the sample cavity, the upper end of the outer cover sample cavity is open, the sample seat movably connected to the outer cover sample cavity is rotated upward to cooperate with the second cavity, the prepared sample observation surface is placed in the first cavity with the observation surface facing upward, the limit plate is covered on the end surface of the outer cover sample cavity, and the circular hole channel on the limit plate is aligned with the first cavity. At this time, the top rod is rotated to keep the observation surface of the sample and the cross section of the outer cover sample cavity on the same horizontal plane, the limit plate is removed, the outer cover sample cavity and the sample seat are placed on the stage of the micro-Vickers hardness tester, the stage knob is moved, and the target measurement position is found through the eyepiece, and the micro-Vickers hardness measurement can be carried out. During the measurement, the sample is guaranteed to be stable, the sample is effectively prevented from tilting, and the accuracy of the micro-Vickers hardness measurement is improved;

[0021] The application method of the sample holder for measuring micro-Vickers hardness is applied to the micro-Vickers hardness detection of the sample of the full-automatic phase change instrument.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The invention is suitable for the micro-Vickers hardness detection of a sample of a full-automatic phase change instrument, has a simple structure, a reasonable design, and improves the accuracy of the micro-Vickers hardness measurement.

[0024] The sample seat of the present invention solves the problem of sample tilting or even falling over. The sample is located in the sample seat, which ensures the stability of the sample, effectively prevents the sample from tilting, improves the accuracy of micro-Vickers hardness measurement, and the sample seat is simple to assemble and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0026] Figure 2 It is a three-dimensional schematic diagram of the outer cover sample cavity and the sample cavity of the present invention;

[0027] Figure 3 It is a plane schematic diagram of the limiting piece of the present invention;

[0028] Figure 4 The present invention Figure 2 Schematic cross-sectional view of ;

[0029] Figure 5 It is a schematic cross-sectional view of the outer cover sample cavity of the present invention;

[0030] Figure 6 It is a schematic diagram of the connection between the rotatable seat and the ejector rod of the present invention;

[0031] Figure 7 It is another schematic diagram of the rotatable seat and the ejector rod of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 a limitation on the present invention.

[0035] like Figure 1-7 As shown, a sample holder for measuring micro Vickers hardness comprises an outer cover sample cavity 1 and a sample holder 2 movably connected to the outer cover sample cavity 1, wherein the sample holder 2 comprises a rotatable seat 21 and a push rod 22 fixed on the rotatable seat 21;

[0036] The outer cover sample chamber 1 is detachably connected to a sample chamber 3, wherein the sample chamber 3 includes a chamber with a stepped columnar hole, which is divided into a first chamber 31 and a second chamber 32 integrally formed with the first chamber 31, wherein the first chamber 31 is connected to the second chamber 32;

[0037] A limiting plate 4 is movably disposed on the outer cover sample cavity 1 , and a circular hole channel is disposed at the center of the limiting plate 4 . The circular hole channel is opposite to the first chamber 31 and is coaxially disposed.

[0038] In order to facilitate the testing of columnar metallographic samples with smaller diameters when in use, the first chamber 31 and the second chamber 32 are hollow columnar structures, and the first chamber 31 is gap-matched with the phase change instrument sample. The diameter of the first chamber 31 is 0.1 mm larger than the sample diameter of the phase change instrument.

[0039] In order to ensure the coaxiality of the columnar metallographic sample in the first chamber 31, the diameter of the first chamber 31 is 0.1 mm larger than the diameter of the sample used in the phase change instrument.

[0040] In order to facilitate connection in use, the inner wall of the first chamber 31 is smooth, and the second chamber 32 is provided with an internal thread, and the second chamber 32 is threadedly connected to the sample holder 2 .

[0041] The second chamber 32 is threadedly connected to a push rod 22 fixed on the rotating seat 21 , and an external thread is provided on the circumferential wall of the push rod 22 to cooperate with the second chamber 32 .

[0042] In the use state, the push rod is screwed into the second chamber 32 to ensure that the detection surface of the columnar metallographic sample can be on the same horizontal plane as the cross section of the outer cover sample chamber 1 under the action of the push rod.

[0043] After the rotating seat 21 is rotated into the second chamber 32 through the push rod 22, the upper and lower surfaces of the outer cover sample chamber 1 remain horizontal.

[0044] In order to facilitate use, a limit plate is provided to ensure that the sample observation surface and the cross-section of the cylindrical cavity are maintained at the same horizontal plane. The limit plate 4 is buckled on the end face of the outer cover sample cavity 1, and the limit plate 4 is tightly fitted with the end face of the outer cover sample cavity 1. Positioning plates 5 are evenly distributed on the circumference of the limit plate 4, and the positioning plates 5 are fitted with the outer circumference of the outer cover sample cavity 1.

[0045] The positioning plate 5 is provided to prevent the limit plate 4 from moving when it is in close contact with the end surface of the outer cover sample cavity 1, thereby playing a role of limiting and fixing.

[0046] In order to facilitate disassembly and replacement in use, a connecting end 6 is detachably provided on the end surface of the push rod 22, and a plurality of connecting ends 6 are provided.

[0047] In the use state, the connection end 6 may be used or not used according to different experimental samples. The connection end 6 is a cylindrical structure, and the connection end 6 is connected to the end surface of the push rod 22 in a plug-in manner.

[0048] For the convenience of use, the connecting end 6 is arranged to adapt to the height of the second chamber, the diameter of the connecting end 6 is smaller than the diameter of the top rod 22 , and the height of the connecting end 6 is not greater than one third of the total height of the top rod 22 .

[0049] In order to facilitate disassembly and replacement in use, the detachable connection between the outer cover sample chamber 1 and the sample chamber 3 is a threaded connection.

[0050] A method for applying a sample holder for measuring micro-Vickers hardness comprises the following steps: connecting the outer cover sample cavity 1 with the sample cavity 3, wherein the upper end of the outer cover sample cavity 1 is open, rotating the sample holder 2 movably connected to the outer cover sample cavity 1 upward to cooperate with the second cavity 32, placing the prepared sample observation surface upward in the first cavity 31, covering the end surface of the outer cover sample cavity 1 with a stopper 4, aligning the circular hole channel on the stopper 4 with the first cavity 31, and then starting to rotate the push rod 22, so that the end of the columnar metallographic sample contacts and cooperates with the push rod 22, so that the sample observation surface and the cross section of the outer cover sample cavity 1 are kept on the same horizontal plane, removing the stopper 4, placing the outer cover sample cavity 1 and the sample holder 2 on the stage of the micro-Vickers hardness tester, moving the stage knob, finding the target measurement position through the eyepiece, and then measuring the micro-Vickers hardness. During the measurement, the sample is ensured to be stable, the sample is effectively prevented from tilting, and the accuracy of the micro-Vickers hardness measurement is improved;

[0051] The application method of the sample holder for measuring micro-Vickers hardness is applied to the micro-Vickers hardness detection of the sample of the full-automatic phase change instrument.

[0052] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sample holder for measuring micro Vickers hardness, characterized in that: It comprises an outer cover sample chamber (1) and a sample seat (2) movably connected to the outer cover sample chamber (1), wherein the sample seat (2) comprises a rotatable seat (21) and a push rod (22) fixed on the rotatable seat (21); The outer cover sample cavity (1) is detachably connected to a sample cavity (3), wherein the sample cavity (3) comprises a cavity having a stepped columnar hole, wherein the stepped columnar hole cavity is divided into a first cavity (31) and a second cavity (32) integrally formed with the first cavity (31), wherein the first cavity (31) and the second cavity (32) are arranged in communication; A limiting plate (4) is movably arranged on the outer cover sample cavity (1), a circular hole channel is arranged at the center of the limiting plate (4), and the circular hole channel is opposite to the first chamber (31) and is arranged coaxially.

2. The sample holder for measuring micro Vickers hardness according to claim 1, characterized in that: The first chamber (31) and the second chamber (32) are in a hollow columnar structure, and the first chamber (31) is gap-matched with a phase change instrument sample. The diameter of the first chamber (31) is 0.1 mm larger than the diameter of the sample used in the phase change instrument.

3. The sample holder for measuring micro Vickers hardness according to claim 2, characterized in that: The inner wall of the first chamber (31) is smoothly arranged, the second chamber (32) is provided with an internal thread, and the second chamber (32) is threadedly connected to the sample holder (2).

4. The sample holder for measuring micro Vickers hardness according to claim 3, characterized in that: The second chamber (32) is threadedly connected to a push rod (22) fixed on the rotating seat (21); an external thread is provided on the circumferential wall of the push rod (22) to cooperate with the second chamber (32).

5. The sample holder for measuring micro Vickers hardness according to claim 4, characterized in that: After the rotating seat (21) is rotated into the second chamber (32) through the push rod (22), the upper and lower surfaces of the outer cover sample chamber (1) remain horizontal.

6. The sample holder for measuring micro Vickers hardness according to claim 5, characterized in that: The limiting plate (4) is buckled onto the end face of the outer cover sample cavity (1), and the limiting plate (4) is tightly fitted with the end face of the outer cover sample cavity (1). Positioning plates (5) are evenly arranged on the circumference of the limiting plate (4), and the positioning plates (5) are fitted with the outer circumference of the outer cover sample cavity (1).

7. The sample holder for measuring micro Vickers hardness according to claim 6, characterized in that: A connecting end (6) is detachably arranged on the end surface of the push rod (22), and a plurality of connecting ends (6) are arranged.

8. The sample holder for measuring micro Vickers hardness according to claim 7, characterized in that: The diameter of the connecting end (6) is smaller than the diameter of the top rod (22).

9. The sample holder for measuring micro Vickers hardness according to claim 8, characterized in that: The detachable connection between the outer cover sample chamber (1) and the sample chamber (3) is a threaded connection.

10. An application method of a sample holder for measuring micro Vickers hardness according to any one of claims 1 to 8, characterized in that: The steps include: The outer cover sample cavity (1) is connected to the sample cavity (3), the upper end of the outer cover sample cavity (1) is open, the sample holder (2) movably connected to the outer cover sample cavity (1) is rotated upward to cooperate with the second cavity (32), the prepared sample is placed in the first cavity (31) with the observation surface facing upward, the limiting plate (4) is covered on the end surface of the outer cover sample cavity (1), the circular hole channel on the limiting plate (4) is aligned with the first cavity (31), and the top rod (22) is rotated at this time to keep the observation surface of the sample and the cross section of the outer cover sample cavity (1) on the same horizontal plane, the limiting plate (4) is removed, the outer cover sample cavity (1) and the sample holder (2) are placed on the stage of the micro-Vickers hardness tester, the stage knob is moved, and the target measurement position is found through the eyepiece, and the micro-Vickers hardness measurement can be carried out. During the measurement, the sample is ensured to be stable, the sample is effectively prevented from tilting, and the accuracy of the micro-Vickers hardness measurement is improved; The application method of the sample holder for measuring micro-Vickers hardness is applied to the micro-Vickers hardness detection of the sample of the full-automatic phase change instrument.

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