Sample holder for measuring micro Vickers hardness

Abstract

The utility model discloses a sample holder for measuring micro Vickers hardness, which comprises an outer cover sample cavity and a sample holder movably connected with the outer cover sample cavity, the sample holder comprises a rotatable seat and an ejector rod fixedly arranged on the rotatable seat, the inner part of the outer cover sample cavity is detachably connected with a sample cavity, and the ejector rod is movably connected with the outer cover sample cavity. 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 micro Vickers hardness detection of a sample of a full-automatic phase change instrument, is simple in structure and reasonable in design, and improves the accuracy of micro Vickers hardness measurement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of metal material engineering technology, and specifically relates to a sample holder for measuring micro Vickers hardness. BACKGROUND

[0002] In the process of C curve determination of steel by using a full-automatic phase change instrument, metallographic microstructure analysis and microhardness determination of different organizations are often needed to assist in drawing the curve. The sample used by the phase change instrument is a cylindrical sample. Because the sample is too small, the sample is clamped by a clamp and then ground. However, when the sample is immersed and etched, the etchant and the gap between the clamp and the metal sample tend to accumulate. 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 clamp, and the microstructure morphology is observed first, and then the micro Vickers hardness of the sample is determined. When the micro Vickers hardness is determined, the sample observation section is placed upward, and the sample opening surface is placed downward on the hardness tester loading table. Because the contact surface between the sample and the hardness tester workbench is very small, when the measurement position is located at the edge of the sample, the sample is easy to tilt or even fall under the action of a certain load, causing measurement deviation.

[0003] Patent No. (CN 109855998 A) discloses a sample preparation device for micro Vickers hardness analysis. This device needs to put the sample into the base for hot embedding, and then directly measure. This device will contaminate the surface of the prepared metallographic sample during operation, and is not suitable for the already ground metallographic sample.

[0004] Patent No. (CN203949824U) discloses a universal clamp for micro Vickers hardness tester. Four positioning clamping legs pass through the positioning hole to fix the measured sample in the cavity. The positioning clamping legs need to have enough contact surface with the measured sample to fix the sample firmly. This clamp is not suitable for small diameter cylindrical metallographic samples.

[0005] Patent No. (CN 115452519 A) discloses a method for preparing a micro Vickers hardness sample. The sample is treated by cold embedding and hot embedding. The operation is relatively complicated. Moreover, the embedding agent and the metal sample have different hardness, and after grinding, a very small gap is formed between the sample and the embedding resin. After etching, the etching liquid cannot be avoided to enter, resulting in contamination of the sample detection surface, which is not conducive to micro observation and measurement.

[0006] In view of the above factors, a sample holder for measuring micro Vickers hardness is provided, which is suitable for micro Vickers hardness detection of full-automatic phase change instrument samples, has simple structure, reasonable design, and improves the accuracy of micro Vickers hardness measurement. UTILITY MODEL CONTENTS

[0007] The utility model discloses a purpose lies in providing a kind of sample holder for determining micro vickers hardness, to solve the problem presented in the above background technology.

[0008] The utility model discloses a purpose is realized by the following technical scheme: a kind of sample holder for determining micro vickers hardness, including outer cover sample cavity and with the outer cover sample cavity movable connection sample holder, the sample holder includes rotatable seat and fixedly arranged on rotating seat top rod;

[0009] The outer cover sample cavity is detachably connected with the sample cavity, and the sample cavity includes a stepped columnar hole chamber, which is divided into a first chamber and a second chamber integrally formed with the first chamber.

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

[0011] Further, the first chamber and the second chamber are hollow cylindrical structures, and the first chamber is matched with the sample gap of the phase change instrument, and the diameter of the first chamber is 0.1 mm larger than the diameter of the sample applied to the phase change instrument.

[0012] Further, the inner wall of the first chamber is smooth, the second chamber is provided with internal threads, and the second chamber is threadedly connected with the sample holder.

[0013] Further, the second chamber is threadedly connected with the top rod fixedly arranged on the rotating seat, and the outer threads on the circumferential wall of the top rod are matched with the second chamber.

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

[0015] Further, the limiting sheet is buckled on the end face of the outer cover sample cavity, the limiting sheet is tightly attached to the end face of the outer cover sample cavity, and positioning plates are uniformly arranged on the circumference of the limiting sheet.

[0016] Further, a connecting end is detachably arranged on the end face of the top rod, and the connecting end is provided with a plurality of connecting ends.

[0017] Further, the diameter of the connecting end is smaller than the diameter of the top rod.

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

[0019] An application method of a sample holder for determining micro vickers hardness includes the following steps:

[0020] The outer cover sample cavity is connected with the sample cavity, the upper end of the outer cover sample cavity is open, the sample seat movably connected with the outer cover sample cavity is rotated upward to cooperate with the second chamber, the prepared sample observation surface is placed upward in the first chamber, the limiting sheet is covered on the end surface of the outer cover sample cavity, the circular hole passage on the limiting sheet is aligned with the first chamber, at this time, the top rod is started to rotate, the sample observation surface is kept in the same horizontal plane with the cross section of the outer cover sample cavity, the limiting sheet is removed, the outer cover sample cavity and the sample seat are placed on the objective table of the micro Vickers hardness tester, the objective table knob is moved, the target measurement position is found through the ocular lens, and the micro Vickers hardness can be measured.

[0021] The application method of the sample seat 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 micro Vickers hardness measurement accuracy is improved.

[0023] The micro Vickers hardness measurement accuracy is improved.

[0024] The sample seat solves the problems of sample inclination and even dumping, the sample is located in the sample seat, the sample is stable, the sample inclination is effectively prevented, the micro Vickers hardness measurement accuracy is improved, and the sample seat is simple in assembly and easy to operate. DETAILED DESCRIPTION

[0025] Figure 1 is a perspective view of the utility model;

[0026] Figure 2 is a perspective view of the outer cover sample cavity and the sample cavity of the utility model;

[0027] Figure 3 is a plane view of the limiting sheet of the utility model;

[0028] Figure 4 is a sectional view of the utility model Figure 2 ;

[0029] Figure 5 is a sectional view of the outer cover sample cavity of the utility model;

[0030] Figure 6 is a connection view of the rotatable seat and the top rod of the utility model;

[0031] Figure 7 is another connection view of the rotatable seat and the top rod of the utility model. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0033] In the description of the present application, it should be noted that, unless explicitly defined and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] As shown in FIG. 1, a sample seat for measuring micro Vickers hardness comprises an outer cover sample cavity 1 and a sample seat 2 movably connected with the outer cover sample cavity 1, the sample seat 2 comprises a rotatable seat 21 and a top rod 22 fixedly arranged on the rotatable seat 21. Figures 1-7 A sample cavity 3 is detachably connected in the outer cover sample cavity 1, the sample cavity 3 comprises a stepped columnar hole chamber, which is divided into a first chamber 31 and a second chamber 32 integrally formed with the first chamber 31, and the first chamber 31 and the second chamber 32 are arranged in communication.

[0036] A limiting sheet 4 is movably arranged on the outer cover sample cavity 1, a circular hole passage is arranged at the center position of the limiting sheet 4, the circular hole passage is opposite to the first chamber 31 and coaxially arranged.

[0037]

[0038] ​In order to facilitate the application of smaller diameter cylindrical metallographic specimen testing in use, the first chamber 31 and the second chamber 32 are hollow cylindrical structure, and the first chamber 31 is matched with the phase transition instrument specimen gap, and the diameter of the first chamber 31 is greater than the diameter of the specimen used in the phase transition instrument by 0.1mm.

[0039] In order to ensure the coaxiality of the cylindrical metallographic specimen in the first chamber 31, the diameter of the first chamber 31 is greater than the diameter of the specimen used in the phase transition instrument by 0.1mm.

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

[0041] The second chamber 32 is threadedly connected with the ejector rod 22 fixed on the rotating seat 21, and the outer threads on the circumferential wall of the ejector rod 22 are matched with the second chamber 32.

[0042] In use, the ejector rod is screwed into the second chamber 32, so that the detection surface of the cylindrical metallographic specimen can be kept on the same horizontal plane under the action of the ejector rod.

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

[0044] In order to facilitate the determination of the specimen observation surface and the cylindrical cavity section in the same horizontal plane in use, the limiting piece 4 is buckled on the end face of the outer cover specimen cavity 1, the limiting piece 4 is closely attached to the end face of the outer cover specimen cavity 1, the positioning plate 5 is uniformly arranged on the circumference of the limiting piece 4, and the positioning plate 5 is closely attached to the outer circumference of the outer cover specimen cavity 1.

[0045] The positioning plate 5 prevents the limiting piece 4 from moving when it is closely attached to the end face of the outer cover specimen cavity 1, and plays a limiting and fixing role.

[0046] In order to facilitate disassembly and replacement in use, the end face of the ejector rod 22 is provided with a detachable connecting end 6, and the connecting end 6 is provided with several connecting ends.

[0047] In use, the connecting end 6 or not can be used according to different experimental specimens, the connecting end 6 is a cylindrical structure, and the connecting end 6 is connected to the end face of the ejector rod 22 in a plug-in manner.

[0048] In order to facilitate the use of the state, by setting the connecting end 6 to adapt to the height of the second chamber, the diameter of the connecting end 6 is smaller than the diameter of the ejector rod 22, and the height of the connecting end 6 is not greater than three-thirds of the total height of the ejector rod 22.

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

[0050] An application method of a sample seat for measuring micro Vickers hardness, comprising the following steps: connecting the outer cover sample chamber 1 and the sample chamber 3, the outer cover sample chamber 1 is open at the upper end, rotating the sample seat 2 movably connected to the outer cover sample chamber 1 upward to cooperate with the second chamber 32, placing the prepared sample observation surface upward in the first chamber 31, covering the end face of the outer cover sample chamber 1 with the limiting piece 4, aligning the circular hole passage on the limiting piece 4 with the first chamber 31, at this time, start rotating the ejector rod 22, the end of the cylindrical metallographic sample is in contact with the ejector rod 22, so that the sample observation surface and the cross section of the outer cover sample chamber 1 are kept in the same horizontal plane, remove the limiting piece 4, and place the outer cover sample chamber 1 and the sample seat 2 on the microscope Vickers hardness tester stage, move the stage knob, find the target measurement position through the ocular lens, and then the micro Vickers hardness measurement can be carried out, during the measurement, the sample is stable, the sample inclination is effectively prevented, and the accuracy of the micro Vickers hardness measurement is improved.

[0051] The application method of the sample seat 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 is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0053] In addition, it should be understood that although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A sample holder for determining micro Vickers hardness, characterized in that: It includes an outer sample chamber (1) and a sample seat (2) movably connected to the outer sample chamber (1). The sample seat (2) includes a rotatable seat (21) and a top rod (22) fixed on the rotatable seat (21). The outer cover sample chamber (1) is detachably connected to the sample chamber (3). The sample chamber (3) includes a stepped columnar hole chamber, which is divided into a first chamber (31) and a second chamber (32) integrally formed with the first chamber (31). The first chamber (31) and the second chamber (32) are connected. A limiting piece (4) is movably disposed on the outer cover sample chamber (1). A circular hole channel is provided at the center of the limiting piece (4). The circular hole channel is opposite to the first chamber (31) and is coaxially disposed.

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

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

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

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

6. The sample holder for determining micro Vickers hardness according to claim 5, characterized in that: The limiting piece (4) is fastened to the end face of the outer cover sample cavity (1), the limiting piece (4) is tightly fitted to the end face of the outer cover sample cavity (1), and positioning plates (5) are evenly distributed on the circumference of the limiting piece (4), the positioning plates (5) are fitted to the outer circumference of the outer cover sample cavity (1).

7. The sample holder for determining micro Vickers hardness according to claim 6, characterized in that: The top rod (22) has a detachable connecting end (6) on its end face, and several connecting ends (6) are provided.

8. The sample holder for determining 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 determining 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.

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