A method for detecting the hardness of pyrophyllite

Abstract

The present invention relates to a method for detecting the hardness performance of a pyrophyllite block. Generally speaking, the detection method of the present invention uses a Rockwell hardness tester to detect key points on a specific surface of a plurality of pyrophyllite blocks of the same type but different specifications by using Rockwell steel ball indenters of different diameters and total test stresses of different sizes. Under the premise of ensuring that the pyrophyllite block is not damaged and does not affect subsequent synthesis and use, stable and reliable measurement data is obtained, and the measured hardness data is effectively analyzed to remove outliers, determine the stability of the data, and establish a standard hardness range for pyrophyllite blocks of corresponding specifications; after the standard hardness range is established, the hardness test is performed on the pyrophyllite block to be tested, and the hardness data obtained by the test is compared with the standard hardness range, so that the softness and hardness uniformity of the block can be effectively evaluated without affecting the performance and use of the pyrophyllite block.

Description

Technical Field

[0001] The invention relates to the technical field of hardness testing, in particular to a method for detecting the hardness performance of a pyrophyllite block. Background Art

[0002] With the development of modern industry and technology, the demand for artificial superhard materials in industrial production has continued to increase. In recent decades, superhard materials have seen significant growth in terms of production volume, quality, and application scale. Pyrophyllite, with its excellent pressure transmission, heat resistance, thermal insulation, insulation, and sealing properties, is the most widely used and critical auxiliary material in the production of superhard materials.

[0003] Unlike metal materials, pyrophyllite blocks are difficult to ensure internal uniformity during production. Furthermore, the blocks have weak deformation capabilities and are easily broken under high pressure. Currently, when evaluating the hardness and softness uniformity of pyrophyllite blocks, the performance of other pyrophyllite blocks produced in the same batch is often evaluated based on the results of on-machine synthesis experiments on a subset of these blocks. However, this evaluation method is often accompanied by accidents such as pressure relief and blasting, which also increases wear and tear on the press's top hammer. Furthermore, if the poor performance of individual pyrophyllite blocks within the same batch causes pressure relief and blasting, the entire batch of pyrophyllite blocks can be discarded, resulting in significant waste and significantly increasing costs for the company.

[0004] Accurately evaluating the properties of pyrophyllite blocks has a significant impact on improving the quality of superhard material synthesis, ensuring process stability, and reducing product resource loss and enterprise costs. Therefore, a non-destructive testing and analysis method that can effectively evaluate the soft and hard uniformity of pyrophyllite blocks is urgently needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for detecting the hardness performance of pyrophyllite blocks, so as to solve the problems of low accuracy, large loss and high cost of existing pyrophyllite block hardness evaluation methods.

[0006] The detection method of the pyrophyllite block hardness performance of the present invention comprises the following steps:

[0007] 1) Performing hardness testing on multiple pyrophyllite blocks of the same type and determining a standard hardness range of the pyrophyllite blocks based on the hardness data, specifically comprising the following steps;

[0008] 1.1 Prepare the pyrophyllite block to be tested. The pyrophyllite block to be tested is a rectangular block with a cylindrical cavity in the middle. The cylindrical cavity runs through two opposite sides of the rectangular block.

[0009] 1.2 Determine the testing points at the key points of the phyllite to be tested;

[0010] 1.3 Conduct hardness tests on the determined test points, and conduct multiple combined tests on the pyrophyllite blocks with different specifications and different maximum total test stresses to obtain hardness data of different combinations, and ensure that the pyrophyllite blocks will not be damaged after the test, which will not affect the subsequent synthesis and use of the pyrophyllite blocks;

[0011] 1.4 Record all hardness data of all test points, and perform outlier analysis on the recorded hardness data to eliminate outliers;

[0012] 1.5 After removing the outliers, the standard hardness range of pyrophyllite blocks was obtained based on the hardness data analysis;

[0013] 2) Perform a hardness test on the phyllite block to be tested, and compare the hardness data with the standard hardness range determined by 1.5 to obtain the local and overall hardness uniformity of the phyllite block to be tested.

[0014] The method for detecting the hardness performance of the pyrophyllite block of the present invention is pioneering in that it selects key points on the surface of the pyrophyllite block for hardness detection, which can effectively reflect the local and overall hardness and softness of the pyrophyllite block, does not require other loss-type processing of the pyrophyllite block, and does not affect the subsequent synthesis and use of the pyrophyllite block after detection. Moreover, by detecting all the produced pyrophyllite blocks, the detection results are refined from the entire batch to each block, and the hardness uniformity of the pyrophyllite block can be accurately evaluated. This can be used as a performance evaluation index of the pyrophyllite block, while reducing the risk of pressure relief blasting and reducing the loss of the press top hammer, thereby greatly improving the detection accuracy and utilization rate of the pyrophyllite block and reducing the cost.

[0015] Furthermore, in step 1.2, testing points are determined on both sides of the cylindrical cavity of the pyrophyllite block to be tested, and testing points are determined on the remaining four sides. By selecting testing points on all sides of the pyrophyllite block to be tested, the local and overall hardness of the pyrophyllite block can be more accurately evaluated, thereby improving the comprehensiveness and accuracy of the hardness performance evaluation of the pyrophyllite block.

[0016] Furthermore, when determining the test points in 1.2, four test points are selected on both sides of the cylindrical cavity of the pyrophyllite block to be tested. The test points are the centers of the shortest lines connecting the four corners to the outer circle of the central hole. On the remaining four sides of the pyrophyllite block to be tested, the diagonal intersections of the corresponding surfaces are selected as test points. Selecting these locations as test points allows the selection of as few test points as possible to accurately reflect the hardness of each part of the pyrophyllite block to be tested and the entire block, thereby improving detection efficiency while ensuring detection accuracy.

[0017] Furthermore, the four detection points on one side of the cylindrical cavity of the pyrophyllite block to be tested are marked in a clockwise direction as the first, second, third, and fourth detection points, and the four detection points on the other side of the cylindrical cavity of the pyrophyllite block to be tested are similarly marked in a clockwise direction as the first, second, third, and fourth detection points. The first, second, third, and fourth detection points on the two sides correspond to each other in the axial direction of the cylindrical cavity, so as to facilitate recording the hardness data of the detection points on the two sides. This makes it easier to mark the hardness data of each detection point and facilitates data statistics and analysis.

[0018] Furthermore, in 1.3, the indenter specifications are steel ball diameters of 1.588mm, 3.175mm, 6.35mm, and 12.7mm, and the total test stresses are 588N and 980N, respectively. For the pyrophyllite blocks with different composition, the indenters of different specifications are combined with the two total test stresses to determine the optimal steel ball diameter and total test stress for each of these blocks. Combined testing is then performed. This allows for finding the optimal testing method for pyrophyllite blocks with different composition (artificial pyrophyllite blocks with different composition, natural pyrophyllite blocks with different composition) and block sizes, ensuring the accuracy of the combined test data.

[0019] Furthermore, it was determined that for natural pyrophyllite blocks, 6.35mm was used with a total test stress of 588N, and for artificial pyrophyllite blocks, 6.35mm was used with a total test stress of 980N, and for artificial pyrophyllite blocks, 12.7mm was used with a total test stress of 980N. This method of testing can obtain more accurate combined test data.

[0020] Furthermore, in 1.4, it is necessary to determine and remove abnormal values for all measured hardness data; when judging whether the data is an abnormal value, for each phyllite block, the hardness data of the four test points on the four sides parallel to the axis of the cylindrical cavity are used as a group of hardness data of the same type of points, and the hardness data of the four test points on the side through which the cylindrical cavity passes are used as a group of hardness data of the same type of points, that is, there are three groups of hardness data of the same type of points for each phyllite block; when the difference between the hardness data of a certain test point and the hardness mean of the hardness data of the other three test points of the same type of points is greater than the standard deviation determined based on the hardness data of the other three points of the same type, the hardness data is judged to be an abnormal value and removed. In this way, the noise data can be accurately eliminated, and the overall stability index and hardness standard range of the phyllite block can be accurately obtained based on the measured hardness data.

[0021] Furthermore, when preparing the pyrophyllite block to be tested in 1.1, the six faces of the pyrophyllite block to be tested are distinguished and recorded to facilitate hardness data of corresponding testing points. This makes it easier to mark the hardness data of each testing point and facilitates data statistics and analysis.

[0022] Furthermore, the side of the pyrophyllite block facing the presser when it is removed from the press is designated as the first side, and the other sides are designated as the second side, the third side, and the fourth side in clockwise order. The remaining two sides of the pyrophyllite block are the two sides through which the cylindrical cavity passes, and the upper side of the two sides is designated as side A, and the lower side is designated as side B. This facilitates the distinguishing and marking of hardness data at the same type of points, and is less likely to cause data recording errors.

[0023] Furthermore, the hardness data analysis in 1.5 involves determining the discreteness of the hardness data, creating a boxplot analysis, and identifying the data distribution characteristics. The height of the boxes in the boxplot analysis is used to determine the degree of data fluctuation. By analyzing and comparing the hardness data of different batches of the same type of pyrophyllite, a standard hardness range is determined. Data analysis using boxplots can quickly and easily determine the degree of data fluctuation, facilitate the determination of the discreteness of the hardness data, and thus accurately and quickly determine the stability standard and standard range of the hardness data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of marking each side of a pyrophyllite block in Example 1 of the method for detecting the hardness of a pyrophyllite block of the present invention;

[0025] Figure 2 Schematic diagram of marking detection points on the first and fourth sides of a pyrophyllite block in Example 1 of the method for detecting the hardness of a pyrophyllite block of the present invention;

[0026] Figure 3 Schematic diagram of marking detection points on side A of a pyrophyllite block in Example 1 of the method for detecting the hardness of a pyrophyllite block of the present invention;

[0027] Figure 4 This is a schematic diagram of marking detection points on the A and B sides of a pyrophyllite block in Example 1 of the method for detecting the hardness performance of a pyrophyllite block of the present invention.

[0028] In the figure: 1, first side; 2, second side; 3, third side; 4, fourth side. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0031] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover 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 additional identical elements in the process, method, article, or apparatus comprising the element.

[0032] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0033] Example 1 of the method for detecting the hardness performance of pyrophyllite blocks of the present invention:

[0034] This embodiment adopts the following detection method:

[0035] Generally speaking, the detection method of this embodiment uses a Rockwell hardness tester to detect key points on the specific surface of a plurality of pyrophyllite blocks of the same type but different specifications through Rockwell steel ball indenters of different diameters and total test stresses of different sizes. Under the premise of ensuring that the pyrophyllite block is not damaged and does not affect subsequent synthesis and use, stable and reliable measurement data is obtained, and the measured hardness data is effectively analyzed, outliers are removed, the stability of the data is determined, and a standard hardness range for pyrophyllite blocks of corresponding specifications is established. After the standard hardness range is established, a hardness test is performed on the pyrophyllite block to be tested, and the hardness data obtained by the test are compared with the standard hardness range. Therefore, an effective evaluation can be made on the softness and hardness uniformity of the block without affecting the performance and use of the pyrophyllite block.

[0036] The specific steps include:

[0037] Prepare the pyrophyllite block to be tested: Prepare the pyrophyllite block of corresponding specifications. The pyrophyllite block to be tested is a hollow pressure-transmitting block in the shape of a rectangular parallelepiped with a cylindrical cavity in the middle. The cylindrical cavity runs through the two opposite sides of the rectangular parallelepiped block. The pressure-transmitting block to be tested must meet the requirements of other product standards. First, distinguish and record the six sides of the hollow pressure-transmitting block, such as Figure 1 As shown, the side of the block facing the presser when it is taken out of the press is the first side 1, and the other sides are the second side 2, the third side 3 and the fourth side 4 in clockwise order. At the same time, the side of the block on the upper side is the A side, and the side of the block on the lower side is the B side. The A side and the B side are the two sides through which the cylindrical cavity passes, and the first, second, third and fourth sides 4 are the sides parallel to the axis of the cylindrical cavity.

[0038] Determine the test points at the key points of the talc block to be tested: To determine the method for testing the uniformity of the hardness of the block, first determine the point that can best reflect the hardness data of the side and upper and lower sides of the hollow pressure-transmitting block, that is, the best hardness test position. For the first, second, third, and fourth sides 4 of the hollow pressure-transmitting block, select the diagonal intersection positions as the hardness test points of these sides, and determine the test points by drawing cross lines on the corresponding sides. Each point is measured at a point, such as Figure 2 It shows that P1 and P2 marked on the first side surface 1 and the fourth side surface 4 respectively are detection points of the two side surfaces.

[0039] For the A side and B side of the hollow pressure transmission block, such as Figure 3-4As shown, the center positions of the shortest connecting lines from the four corners to the outer circle of the center hole are taken as detection points on the A side and the B side respectively. The four detection points on the A side are respectively recorded as the first detection point A1, the second detection point A2, the third detection point A3, and the fourth detection point A4 in clockwise order. The four detection points on the B side are respectively recorded as the first detection point B1, the second detection point B2, the third detection point B3, and the fourth detection point B4 in clockwise order. The first, second, third, and fourth detection points on the two side surfaces correspond to each other in the axial direction of the cylindrical cavity, so as to facilitate the recording of the hardness data of the detection points on the two side surfaces.

[0040] Since there are different types of pyrophyllite blocks at present, including natural pyrophyllite blocks and artificial pyrophyllite blocks, and the ingredients of the two types of pyrophyllite blocks are also different, for these different types of pyrophyllite blocks, this embodiment first conducts a combination test to determine the optimal detection method for the different types of pyrophyllite blocks to be tested. After determining the optimal detection method for different types of pyrophyllite blocks, the optimal detection method is used to perform combined detection on the corresponding types of pyrophyllite blocks.

[0041] First, Rockwell steel ball indenters of varying diameters and total test stresses were used for different types of pyrophyllite blocks: indenter sizes of 1.588mm, 3.175mm, 6.35mm, and 12.7mm, with total test stresses of 588N and 980N, respectively. The different indenter sizes were combined with the two total test stresses to ensure that the pyrophyllite blocks did not break after testing and did not affect their subsequent use in synthetic processes. The optimal combination of indenter size and total test stress was determined for each block. After testing, the optimal combinations were determined to be 6.35mm with a total test stress of 588N and 12.7mm with a total test stress of 588N for natural pyrophyllite blocks, and 6.35mm with a total test stress of 980N and 12.7mm with a total test stress of 980N for artificial pyrophyllite blocks. Based on this optimal combination, the indenter position was aligned with the marked points on the pyrophyllite blocks, and measurements were performed at the corresponding points.

[0042] Record the hardness data of each test point measured on the pyrophyllite block to be tested, and analyze the abnormal values of all hardness data. It is necessary to determine and remove the abnormal values of all measured hardness data to determine whether the data is an abnormal value. Specifically, when determining whether the data is an abnormal value, for each pyrophyllite block, the hardness data of a total of four test points on the four sides parallel to the axis of the cylindrical cavity are used as a group of hardness data of the same type of points, and the hardness data of the four test points on the side through which the cylindrical cavity passes are used as a group of hardness data of the same type of points, that is, there are three groups of hardness data of the same type of points for each pyrophyllite block; when the difference between the hardness data of a certain test point and the hardness mean value of the hardness data of the other three test points of the same type of points is greater than the standard deviation determined based on the hardness data of the other three points of the same type, the hardness data is determined to be an abnormal value and is removed.

[0043] After removing outliers, the discreteness of the block hardness data was determined, and a boxplot analysis was constructed to characterize the data distribution. The height of the boxes in the boxplot analysis revealed the degree of data fluctuation. By analyzing and comparing different batches of the same type of pyrophyllite blocks, the overall stability standard and standard hardness range of the blocks were determined.

[0044] After the standard is established, the hardness of each pyrophyllite block is tested, and its hardness data is compared with the standard hardness range to obtain the local and overall hardness uniformity of the pyrophyllite block.

[0045] The method for detecting the hardness performance of the pyrophyllite block of the present invention is pioneering in that it selects key points on the surface of the pyrophyllite block for hardness detection, which can effectively reflect the local and overall hardness and softness of the pyrophyllite block, does not require other loss-type processing of the pyrophyllite block, and does not affect the subsequent synthesis and use of the pyrophyllite block after detection. Moreover, by detecting all the produced pyrophyllite blocks, the detection results are refined from the entire batch to each block, and the hardness uniformity of the pyrophyllite block can be accurately evaluated. This can be used as a performance evaluation index of the pyrophyllite block, while reducing the risk of pressure relief blasting and reducing the loss of the press top hammer, thereby greatly improving the detection accuracy and utilization rate of the pyrophyllite block and reducing the cost.

[0046] The present invention also provides other modified embodiments, as follows:

[0047] In other embodiments, five points can be selected as test points on each of the first, second, third, and fourth sides 4, with one of the five points located at the intersection of the diagonals of the corresponding side, and the remaining four points located at the intersection of the diagonals and a circle centered at the intersection of the diagonals. In this way, when outliers are removed, the hardness data from the five points on each of the first, second, third, and fourth sides are used as five groups of hardness data for the same type of points.

[0048] In other embodiments, four specifications of rockwell steel ball indenters can be used in combination with three total test stresses, which are 588N, 980N, and 1480N, respectively. Twelve different combinations of hardness data are obtained for the same test point to determine the optimal combination of steel ball diameter and total test stress.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A method for detecting the hardness of pyrophyllite, characterized in that: The following steps are involved: 1) Performing hardness testing on multiple pyrophyllite blocks of the same type and determining a standard hardness range of the pyrophyllite blocks based on the hardness data, specifically comprising the following steps; 1.1 Prepare the pyrophyllite block to be tested. The pyrophyllite block to be tested is a rectangular block with a cylindrical cavity in the middle. The cylindrical cavity runs through two opposite sides of the rectangular block. 1.2 Determine the testing points at the key points of the phyllite to be tested; 1.3 Conduct hardness tests on the determined test points, and conduct multiple combined tests on the pyrophyllite blocks with different specifications and different maximum total test stresses to obtain hardness data of different combinations, and ensure that the pyrophyllite blocks will not be damaged after the test, which will not affect the subsequent synthesis and use of the pyrophyllite blocks; 1.4 Record all hardness data of all test points, and perform outlier analysis on the recorded hardness data to eliminate outliers; 1.5 After removing outliers, the standard hardness range of pyrophyllite blocks is obtained based on hardness data analysis. Hardness data analysis refers to judging the discreteness of hardness data, establishing a box plot analysis, and obtaining the characteristics of data distribution. The height of the box in the box plot analysis is used to obtain the degree of data fluctuation. By analyzing and comparing the hardness data of pyrophyllite blocks of the same type but different batches, the standard hardness range is obtained. 2) Perform a hardness test on the phyllite block to be tested, and compare the hardness data with the standard hardness range determined by 1.5 to obtain the local and overall hardness uniformity of the phyllite block to be tested.

2. The method for detecting the hardness of pyrophyllite according to claim 1, wherein: In 1.2, detection points are respectively determined on the two side surfaces of the cylindrical cavity of the pyrophyllite block to be tested, and detection points are respectively determined on the other four side surfaces.

3. The method for detecting the hardness performance of pyrophyllite according to claim 2, wherein: When determining the test points in 1.2, four test points are taken on both sides of the cylindrical cavity of the phyllite block to be tested. The test points are the center positions of the shortest lines from the four corners to the outer circle of the center hole. On the other four side surfaces of the phyllite block to be tested, the intersection points of the diagonals of the corresponding surfaces are taken as test points.

4. The method for detecting the hardness of pyrophyllite according to claim 3, wherein: The four detection points on one side of the cylindrical cavity of the talc block to be tested are marked as the first, second, third and fourth detection points in a clockwise direction, and the four detection points on the other side of the cylindrical cavity of the talc block to be tested are also marked as the first, second, third and fourth detection points. The first, second, third and fourth detection points on the two side surfaces correspond to each other in the axial direction of the cylindrical cavity, so as to facilitate recording the hardness data of the detection points on the two side surfaces.

5. The method for detecting the hardness of pyrophyllite according to any one of claims 1 to 4, wherein In 1.3, the specifications of the indenter are steel ball diameters of 1.588 mm, 3.175 mm, 6.35 mm and 12.7 mm, and the total test stresses are 588 N and 980 N, respectively. For the pyrophyllite blocks with different ingredients to be tested, the indenters of different specifications are combined with the two total test stresses respectively to determine the optimal combination of steel ball diameter and total test stress for the pyrophyllite blocks with different ingredients to be tested, and then the combined test is carried out.

6. The method for detecting the hardness of pyrophyllite according to claim 5, wherein: For natural pyrophyllite blocks, use 6.35mm with a total test stress of 588N and 12.7mm with a total test stress of 588N; for artificial pyrophyllite blocks, use 6.35mm with a total test stress of 980N and 12.7mm with a total test stress of 980N.

7. The method for detecting the hardness of pyrophyllite according to any one of claims 1 to 4, wherein In 1.4, all measured hardness data need to be identified and removed for outliers; when judging whether the data is an outlier, for each phyllite block, the hardness data of a total of four test points on the four side surfaces parallel to the axis of the cylindrical cavity are taken as a group of hardness data for the same type of points, and the hardness data of the four test points on the side surfaces through which the cylindrical cavity passes are taken as a group of hardness data for the same type of points, that is, there are three groups of hardness data for the same type of points for each phyllite block; when the difference between the hardness data of a certain test point and the hardness mean value of the hardness data of the other three test points of the same type of points is greater than the standard deviation determined based on the hardness data of the other three points of the same type, the hardness data is judged to be an outlier and is removed.

8. The method for detecting the hardness of pyrophyllite according to claim 7, wherein When preparing the pyrophyllite block to be tested in 1.1, the six faces of the pyrophyllite block to be tested are distinguished and recorded so as to obtain the hardness data of the corresponding test points.

9. The method for detecting the hardness of pyrophyllite according to claim 8, wherein: The side of the pyrophyllite block facing the presser when the block is taken out of the press is designated as the first side (1), and the other sides are designated as the second side (2), the third side (3), and the fourth side (4) in clockwise order. The remaining two sides of the pyrophyllite block are the two sides through which the cylindrical cavity passes, and the side on the upper side of the two sides is designated as side A, and the side on the lower side is designated as side B.

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