Pressure head calibration device and system

Abstract

The utility model provides a pressure head calibration device, and belongs to the technical field of detection devices. The sample box comprises a sample box body and an adjusting assembly arranged in the sample box body. The adjusting assembly comprises a plurality of fixing devices used for fixing the pressing heads of different sizes, and the fixing devices can ascend and descend in the sample box. According to the utility model, the plurality of liftable fixing devices are arranged in the sample box, so that the pressure heads with different sizes can be fixed and lifted, the pressure heads with different sizes can be detected at the same time, and the detection efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to a pressure head calibration device and a calibration system comprising the pressure head calibration device. Background Art

[0002] At present, hardness testing has been widely used in the field of material mechanical property evaluation due to its simplicity, non-destructiveness and high efficiency. However, as the use time increases, the indenter of the hardness tester will inevitably produce wear and defects, change the angle between the opposite faces of the indenter, affect the accuracy of the test, and even cause the test to fail. Therefore, how to evaluate the surface quality of the indenter and the angle between the opposite faces has become a very meaningful but difficult problem.

[0003] Previously, there were reports on indenter detection methods. Wei Zonglei from Harbin Institute of Technology used atomic force microscopy and laser confocal microscopy (this method can be used to observe the chisel edge at the tip of the indenter, but the accuracy cannot reach the nanometer level) to characterize and calibrate the tip chisel edge, blunt circle radius and tip angle parameters of the diamond indenter, and finally developed a high-precision diamond indenter that is on par with foreign countries. Shanxi Inspection and Testing Center (Shanxi Institute of Standards and Metrology Technology) has designed a portable Rockwell indenter horizontal fixing device that can achieve accurate rotational positioning while ensuring the stability of the indenter, thereby improving the efficiency of indenter detection. Wu Liqiang [3] A morphological model of the diamond indenter was established, and the morphologies of spherical, conical and pointed diamond indenters were obtained by atomic force microscopy and white light interferometry. The above three types of indenters were accurately measured and corrected to a certain extent. Wu Dong proposed a new method for establishing the indenter area function. Fitting it with the traditional method can better characterize the blunt circle radius of the tip after the indenter is worn. The morphology of the ground diamond indenter was characterized by optical microscopy, scanning electron microscopy and atomic force microscopy. The three-dimensional data points of the indenter were extracted by laser confocal microscopy, and the various angle parameters of the indenter were obtained by three-dimensional reconstruction and fitting calculation methods, and the inclination of the measurement system was corrected at the same time. The Chinese Academy of Metrology has designed a device with six degrees of freedom that can measure the angle of the diamond indenter by interference method, which solves the problem of indenter parameter transmission and unification, and improves the accuracy and reliability of indenter shape measurement. Zong Wenjun, Wu Dong and others [6]Through laser confocal microscopy, a method for accurately evaluating the Bosch indenter was determined. This method has the characteristics of high resolution, simple and efficient testing process. However, since the polished diamond surface is very smooth and difficult to focus, this method requires the Bosch indenter to be gold-sprayed. On the one hand, the experimental steps are more cumbersome and costly, and from the perspective of pursuing the accuracy of the indenter morphology, there will be a certain deviation in its morphology before and after gold spraying; on the other hand, the gold film sprayed on the surface of the indenter is difficult to clean, which affects the use of the indenter and increases the subsequent experimental costs and technical difficulties. In addition, this method is limited to the field of nanohardness testing and cannot be extended to the measurement and calibration of macro indenters.

[0004] According to relevant foreign literature, Satoshi Takagi et al. used the NRLM Vickers indenter verification method, scanning white light interferometry and atomic force microscopy to verify the Vickers indenter in a large range, and developed a new Vickers indenter measuring instrument. The results show that the reduction of the measurement range will lead to an increase in the uncertainty of the measurement results. The above three methods all have their suitable measurement ranges, and the improved equipment can verify the geometric morphology of the Vickers indenter under small force conditions. Germak and Origlia used a three-dimensional confocal microscope to determine the overall geometric morphology of the indenter and studied the indenter calibration effect of the instrument. The Vickers indenter was calibrated using a confocal microscope and an indenter calibration instrument developed by the INRIM laboratory, and the differences between the two were compared, and the possible uses of the confocal microscope in other aspects were expanded. Chen et al. used a scanning white light interferometer to obtain images of the Rockwell indenter at different positions and angles, and then restored the geometric morphology of the indenter through image stitching technology. Finally, the cone radius and cone angle of the indenter tip were obtained through algorithm fitting. JMWheeler et al. studied the effect of high temperature oxidation on the geometric morphology of the Bosch indenter by atomic force microscopy, providing direct morphological data for the correction of the indenter area function. Qiu et al. proposed a method for measuring and calibrating the radius of a ball indenter using a laser confocal microscope, and further theoretically analyzed and deduced the uncertainty of measuring the radius of the ball indenter by this method. Li et al. developed a non-imaging optical system to measure the radius of a ball indenter, a cone indenter and a micro Rockwell indenter in view of the shortcomings of laser confocal and interference microscopes in indenter measurement. The measurement data of a sapphire indenter with a nominal radius of 200 μm verified that the measurement system has sufficient resolution. Zong et al. measured the tip radius and necessary angle parameters of the Bosch indenter by atomic force microscopy plus laser confocal microscopy. According to the influence of the tip radius and angle parameters on the tip of the real indenter, a new geometric model was constructed and a new indenter area function was established. The experimental results prove the effectiveness of this method. In addition, some literatures have used similar methods to explain the measurement and calibration of the Bosch indenter, which will not be repeated here.

[0005] In summary, the prior art has not made a comprehensive discussion on the fixing device and detection method of the pressure head, and the coordination between the various existing devices is poor, making it difficult to simultaneously fix and detect multiple pressure heads, resulting in low measurement efficiency and high testing costs. Utility Model Content

[0006] In view of this, in order to solve the technical problems in the prior art that it is difficult to simultaneously fix and detect multiple indenters and the measurement efficiency is low, on the one hand, the utility model provides an indenter calibration device, which realizes the fixation and lifting of indenters of different sizes by arranging multiple lifting and lowering fixing devices in the sample box, and can simultaneously detect multiple indenters of different sizes, thereby greatly improving the detection efficiency.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A pressure head calibration device comprises a sample box and an adjustment component arranged in the sample box;

[0009] The adjustment assembly includes a plurality of fixing devices for fixing pressure heads of different sizes, and the fixing devices can be raised and lowered in the sample box.

[0010] Preferably, a groove matching the shape of the indenter is provided in the upper cover of the sample box, and the groove has an opening exposing the tip of the indenter on the indenter.

[0011] Preferably, the fixing device and the pressing head are fixed by a first fastening screw.

[0012] Preferably, the fixing device is fixed to the sample box by a second fastening screw.

[0013] Preferably, a screw knob is provided at the outer bottom end of the sample box, and the screw knob is threadedly connected to the fixing device via a screw.

[0014] Preferably, a rubber ring is wrapped around the tip of the indenter at the top of the indenter to avoid direct collision with the top surface of the sample box.

[0015] Preferably, the fixing device is a sleeve, and the pressing head is placed in the sleeve and fixed by the first fastening screw.

[0016] Preferably, a reserved hole is provided on the upper cover of the sample box for opening and closing the sample box.

[0017] Preferably, a positioning groove is provided on the side wall of the sample box for engaging with a buckle on the upper cover of the sample box.

[0018] On the other hand, the utility model also provides a pressure head calibration system, comprising:

[0019] Optical measurement system, used to scan the surface topography of the indenter, the surface topography of the indenter and the angle parameters;

[0020] A workbench is provided with the pressure head calibration device.

[0021] The indenter calibration device provided by the utility model realizes the fixing and lifting of indenters of different sizes by arranging multiple lifting and lowering fixing devices in the sample box, and can simultaneously detect multiple indenters of different sizes. Compared with the prior art, it has the following beneficial effects:

[0022] 1) The indenter calibration device and the indenter calibration system including the indenter calibration device provided by the utility model, by placing a plurality of indenters to be measured (which may be indenters of different sizes or the same size) into the device and combining with an optical measurement system (preferably a laser confocal microscope) above a workbench, the surface morphology of the indenter can be observed without gold spraying the surface of the indenter, and the angle parameters of the indenter can be easily obtained through data processing, thereby realizing the inspection and calibration of different indenters.

[0023] 2) It can fix multiple indenters of different sizes and types at the same time, which is convenient for measuring multiple samples in one test, greatly improving the detection efficiency;

[0024] 3) The three-dimensional morphology of the indenter tip can be imaged without gold spraying on the indenter material, which reduces the test cost and difficulty, reduces the contamination of the indenter, and improves the accuracy of the test measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the pressure head calibration device;

[0026] Figure 2 An exploded view of the pressure head calibration device;

[0027] Figure 3 Schematic diagram of the inner structure of the upper cover of the sample box;

[0028] Figure 4 Schematic diagram of the pressure head structure;

[0029] Figure 5 Schematic diagram of sleeve structure;

[0030] Figure 6 It is a schematic diagram of the mechanism of the sample box without the upper cover;

[0031] Figure 7 It is a structural schematic diagram of the pressure head calibration system;

[0032] Figure 8 Scanning image of the Vickers indenter (left) and verification of indenter angle 1 (right);

[0033] Fig. 9 Scanning image of the Vickers indenter (left) and verification of indenter angle 2 (right);

[0034] Fig.10Scanning image of the Knoop indenter (left) and verification of indenter angle 1 (right);

[0035] Fig.11 Scanning image of the Knoop indenter (left) and verification of indenter angle 2 (right).

[0036] In the figure, 1. sample box; 11. upper cover; 111. groove; 112. opening; 113. reserved hole; 12. positioning groove; 2. fixing device; 21. first fastening screw; 22. second fastening screw; 23. sleeve; 3. pressure head; 31. pressure head tip; 4. screw knob; 5. screw; 6. optical measurement system; 7. workbench; 8. rotating handle. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] like Figure 1-6 As shown, the utility model provides a pressure head 3 calibration device, including a sample box 1 and an adjustment component arranged in the sample box 1;

[0041] The adjustment assembly includes a plurality of fixing devices 2 for fixing pressure heads 3 of different sizes, and the fixing devices 2 can be raised and lowered in the sample box 1 .

[0042] In the utility model, the upper cover 11 of the sample box 1 preferably has a groove 111 matching the shape of the indenter 3, and the groove 111 has an opening 112 exposing the indenter tip 31 on the indenter 3. The shape of the opening 112 preferably matches the shape of the indenter tip 31 so that the indenter tip 31 is exposed to facilitate scanning by the optical measurement system 6.

[0043] In the utility model, the fixing device 2 and the pressure head 3 are fixed by a first fastening screw 21. Specifically, the first fastening screw 21 is preferably an embedded fastening screw. The pressure head 3 is fixed to the fixing device 2 by tightening the first fastening screw 21 to press against the bottom end of the pressure head 3.

[0044] In the utility model, the fixing device 2 is fixed to the sample box 1 by a second fastening screw 22. Preferably, the second fastening screw 22 is screwed into the side wall of the sample box 1. By tightening the second fastening screw 22, the second fastening screw 22 is pressed against the fixing device 2, thereby achieving fixation between the fixing device 2 and the sample box 1.

[0045] In the utility model, a screw knob 4 (also called a paddle) is provided at the outer bottom end of the sample box 1 , and the screw knob 4 is screwed to the fixing device 2 via a screw 5 , specifically: the fixing device 2 is raised or lowered by rotating the screw knob 4 .

[0046] In the present invention, a rubber ring is wrapped around the tip 31 of the pressure head 3 to avoid direct collision with the top surface of the sample box 1 .

[0047] In the utility model, the fixing device 2 is a sleeve 23, and the pressure head 3 is placed in the sleeve 23 and fixed by the first fastening screw 21. Each sleeve 23 has an independent space inside, and pressure heads 3 of different sizes or the same size can be directly placed, thereby realizing simultaneous detection of pressure heads 3 of different sizes or multiple sizes of the same size, thereby greatly improving the detection efficiency.

[0048] In the present invention, a reserved hole 113 is provided on the upper cover 11 of the sample box 1 to facilitate the opening and closing of the sample box 1 during sampling and placing samples.

[0049] In the present invention, a positioning groove 12 is provided on the side wall of the sample box 1 for engaging with a buckle on the upper cover 11 of the sample box 1. The upper cover 11 of the sample box 1 can prevent the pressure head 3 from being contaminated and affecting the detection result.

[0050] like Figure 7As shown, on the other hand, the utility model also provides a pressure head 3 calibration system, including:

[0051] An optical measuring system 6 is used to scan the surface topography of the indenter 3 and the surface topography and angle parameters of the indenter 3;

[0052] A workbench 7 on which the pressure head 3 calibration device is arranged;

[0053] The optical measurement system 6 is preferably a laser confocal microscope in the prior art.

[0054] In the present invention, after the pressure head 3 calibration device is placed on the workbench 7, the pressure head 3 calibration device can preferably move in the X / Y direction following the workbench 7. More preferably, the workbench 7 in the present invention can achieve X / Y direction movement, which drives the workbench 7 to move by rotating the handle 8.

[0055] On the other hand, the utility model also provides a method for detecting the indenter 3 using the indenter 3 calibration system, comprising the following steps:

[0056] 1) After placing the indenter 3 to be tested into the fixing device 2, adjust the height of the indenter 3 so that the tip of the indenter 3 is flush with the upper surface of the upper cover 11 of the sample box 1;

[0057] 2) Turn on the optical measurement system 6, move the workbench 7 along the X / Y direction, scan each indenter 3 in sequence according to the set order, obtain the surface morphology image of the indenter 3, perform profile analysis on the scanned image, and obtain the angle parameters of the indenter 3.

[0058] The specific detection process of the above detection method is as follows:

[0059] Remove the upper cover 11 of the sample box 1 from the reserved hole 113, then use tweezers to vertically place the indenter 3 to be tested into one or more sleeves 23, tighten the first fixing screw to fix the indenter 3, and then close the upper cover 11. Turn the screw knob 4 to adjust the height of the sleeve 23 and the indenter 3, so that the tip of the indenter 3 corresponds to the matching groove 111 in the upper cover 11, so that the tip 31 of the indenter is exposed and flush with the upper surface of the upper cover 11. Then tighten the second fastening screw 22 to fix the sleeve 23.

[0060] Turn on the laser confocal microscope, move the workbench 7 along the X / Y direction, scan each indenter 3 in sequence according to the set order, and obtain the topography of the surface of the indenter 3 (the time for obtaining the topography of a single indenter 3 is less than 10 s); perform profile analysis on the scanned image to obtain the angle parameters of the indenter 3 (taking the Vickers indenter 3 and the Knoop indenter 3 as examples, such as Figure 8-11 as shown).

[0061] from Figure 8-11It can be seen that this method can obtain the three-dimensional morphology information of the surface of the indenter 3 (the surface defects of the indenter 3, such as Figure 4 There are some pits on the surface of the Vickers hardness indenter near the tip of the indenter 3). At the same time, through subsequent slice measurement, relevant angle information can be obtained, which can be used to evaluate the quality of the indenter 3 and calibrate whether the indenter 3 is qualified.

[0062] The above are only preferred specific implementations of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A pressure head calibration device, It is characterized in that It includes a sample box and an adjustment component arranged in the sample box; The adjustment assembly includes a plurality of fixing devices for fixing pressure heads of different sizes, and the fixing devices can be raised and lowered in the sample box.

2. A pressure head calibration device according to claim 1, It is characterized in that The upper cover of the sample box is provided with a groove matching the shape of the pressure head, and the groove is provided with an opening exposing the tip of the pressure head on the pressure head.

3. The pressure head calibration device according to claim 1, It is characterized in that The fixing device and the pressure head are fixed by a first fastening screw.

4. The pressure head calibration device according to claim 1, It is characterized in that The fixing device is fixed to the sample box via a second fastening screw.

5. The pressure head calibration device according to claim 1, It is characterized in that A screw knob is arranged at the outer bottom end of the sample box, and the screw knob is screwed to the fixing device via screws.

6. The pressure head calibration device according to claim 1, It is characterized in that The tip of the indenter at the top of the indenter is covered with a rubber ring to avoid direct collision with the top surface of the sample box.

7. The pressure head calibration device according to claim 3, It is characterized in that The fixing device is a sleeve, and the pressure head is placed in the sleeve and fixed by the first fastening screw.

8. The pressure head calibration device according to claim 1, It is characterized in that A reserved hole is provided on the upper cover of the sample box for opening and closing the sample box.

9. A pressure head calibration device according to any one of claims 1 to 8, It is characterized in that A positioning groove is provided on the side wall of the sample box for engaging with the buckle on the upper cover of the sample box.

10. A pressure head calibration system, It is characterized in that include: Optical measurement system, used to scan the surface topography of the indenter, the surface topography of the indenter and the angle parameters; A workbench, on which a pressure head calibration device according to any one of claims 1 to 9 is arranged.

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