Diamond micro-powder grinding performance detection method

Abstract

According to the method for detecting the grinding performance of the diamond micro-powder, firstly, a steel ball with a fixed weight is used as a ball-milling medium to be mixed and ball-milled with a diamond micro-powder standard sample, then the abrasion loss m of the ball-milled steel ball is weighed and calculated, the standard sample diamond micro-powder with each D50 value is repeatedly ball-milled, and finally the grinding performance of the diamond micro-powder is detected. Obtaining the standard sample abrasion loss m1-mn corresponding to the standard sample diamond micro-powder of each D50 value; the method comprises the following steps: during detection, carrying out ball milling on certain diamond micro-powder to be detected by adopting the same ball mill and steel balls with the same weight for the same time, weighing and testing the abrasion loss mc of the ball-milled steel balls, and searching or calculating the standard sample grinding amount m corresponding to a standard sample D50 corresponding to the diamond micro-powder D50 to be detected, namely one of m1-mn; the grinding performance is set to be represented by D, and D = mc / m; the larger the D value is, the better the grinding performance of the to-be-tested diamond micro powder is; the judgment process of the method is based on objective numerical values, and compared with the prior art, the method has the advantages that the accuracy is high and the reference is high through the morphology judgment of the diamond micro-powder.

Description

Technical Field

[0001] The invention relates to the technical field of diamond micropowder performance inspection, and in particular to a diamond micropowder grinding performance inspection method. Background Art

[0002] Diamond is one of the hardest materials known in the world. Diamond powder not only has the ultra-high intrinsic hardness of diamond, but also has high strength and toughness due to the reduction of defects accompanied by the refinement of particle size. Its high hardness, good wear resistance, high thermal conductivity and other characteristics are unmatched by ordinary abrasives, so it has important applications in high-tech industries and traditional pillar industries in the fields of fine grinding, polishing, lubricants, wire cutting, etc. Diamond powder is an ideal raw material for grinding and polishing high-hardness non-metallic materials such as stone, ceramics, gems, optical glass, ultra-fine processing, large-size silicon wafers, etc.

[0003] The grinding performance of diamond micropowder determines the grinding efficiency, which is affected by factors such as the raw material strength and particle shape of the micropowder. It reflects the comprehensive grinding ability of diamond micropowder. At present, there is no effective and stable testing method.

[0004] At present, the industry tends to judge the grinding performance of diamond micropowder based on its particle shape. This judgment method cannot obtain reliable results. The morphology cannot reflect the strength of micropowder particles. In terms of grinding results, the following situations may occur: in the initial stage of grinding, the performance is very excellent and sharp, but the micropowder is consumed in a short time, the grinding performance is lost, the service life is short, and the overall grinding performance is weak. This method cannot truly reflect the grinding performance of micropowder. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a method for detecting the grinding performance of diamond micropowder.

[0006] The technical solution of the present invention is: a method for detecting the grinding performance of diamond micropowder, which is characterized by comprising the following steps:

[0007] ①. Obtaining diamond micro powder standard sample

[0008] Select the micro powder made of diamond single crystal with a particle size of 35 to 60 mesh before crushing and a TI value of 50 to 60; select diamond micro powder with different D50 values ​​and record them as standard samples x1~x n ,; The diamond single crystal used to make the diamond micro-powder standard sample must be limited by the particle size and TI value to ensure the stable performance of the raw materials.

[0009] ② Determination of crushing media and crushing equipment

[0010] Determine the ball mill volume as X ml, the rotation speed as Z r / min, select steel balls as the crushing medium, the diameter of the steel balls is unified as Dq, and the total weight of N steel balls is mq; fix the crushing medium and crushing equipment, establish the basic grinding amount and test, and use the same ones. The data obtained from the test are of reference value.

[0011] ③Ball milling

[0012] Weigh the diamond powder sampled in step ① with a weight of M, mix it with the steel balls selected in step ② and put it into a ball mill for a rotation time of T;

[0013] ④Weighing after ball milling

[0014] After step ③ is completed, the steel balls are taken out from the ball mill, sieved, cleaned, and dried, and weighed to obtain the total weight of the steel balls after ball milling.

[0015] ⑤ Standard sample grinding amount

[0016] Repeat steps ③-④ three times, calculate the average value mh of the total weight of the steel balls after three ball millings, and calculate the grinding amount of the standard sample △m=mq–mh;

[0017] ⑥ Obtain different D50 diamond powder standard grinding amount for the standard samples x1~x in step ① n Carry out steps ③-⑤ in sequence, and the grinding amount of the standard samples obtained is △m1~△m n ;

[0018] ⑦ Grinding performance test of the diamond powder to be tested

[0019] 71.Measure the D50 value of the diamond powder to be tested.

[0020] 72. Weigh the diamond powder to be tested in step 71 with a weight of M, and perform ball milling by determining the crushing medium and crushing equipment in step ② of the sampling step, and rotate for a rotation time of T; after completion, take out the steel balls from the ball mill, screen, clean and dry the steel balls, weigh and obtain the total weight of the steel balls after ball milling, repeat the ball milling three times, calculate the average value mc of the total weight of the steel balls after the three ball millings, and calculate the actual grinding amount of the diamond powder to be tested △mc=mq–mc;

[0021] 73. Calculate grinding performance D

[0022] Find the grinding amount △m of the standard sample D50 corresponding to the diamond powder D50 to be tested in step ⑥, that is, △m1~△m n One of them; set the grinding performance to be represented by D, D = △mc / △m.

[0023] Preferably, the step 71 is replaced by: when the D50 value of the diamond powder to be tested is between the standard sample x n-1 and xn The D50 value is between , so according to the corresponding △m n-1 and △m n , establish the linear function of the two sets of data, △m=k·D50+b; the range of the independent variable is the standard sample x n-1 D50 value to x n The D50 value of the variable ranges from △m n-1 To △m n；

[0024] The corresponding step 73 is replaced by: the D50 value of the diamond powder to be tested is used as the independent variable, and the corresponding △m is calculated according to the above linear function; the grinding performance is set to be represented by D, D = △mc / △m. When the D50 value of the diamond powder to be tested is between the standard sample x n-1 and x n Through linear calculation, a standard sample △m value is obtained to compare with the grinding amount of the diamond powder to be tested. This can solve the problem that the D50 of the powder to be tested does not correspond to that of the standard sample.

[0025] Preferably, the step ⑥ is followed by a step 61: using standard samples x1 to x n D50 is used as the independent variable, and the standard sample grinding amount is △m1~△m n As a variable, the function △m=f(D50) is fitted;

[0026] The corresponding step 73 is replaced by: taking the D50 value of the diamond powder to be tested as the independent variable, and calculating the corresponding △m according to the function in the above step 61; setting the grinding performance to be represented by D, D=△mc / △m.

[0027] This scheme can be used to compare the grinding amount of various values ​​of D50 of the diamond powder to be tested. Through function calculation, the corresponding △m of various D50 values ​​can be obtained.

[0028] Preferably, the 1μm≤D50≤50μm, starting from 1μm, the number of increments of 1μm is repeated until 50μm, and the corresponding standard samples are x1 to x 50 The standard sample covers as many different values ​​of D50 as possible, with a large amount of data, which can reflect the change of grinding performance with D50.

[0029] Preferably, the M is ≤30g.

[0030] Preferably, the ball mill has a capacity of 0-100 ml, a rotation speed of 1200 r / min, a uniform diameter of the steel balls of 5-10 mm, and a ball milling time of T=30 min.

[0031] Preferably, the cleaning in step ④ is performed by using deionized water and ultrasonic cleaning for 10 to 30 minutes, and the drying is performed at 100 to 110° C. for 10 to 20 minutes. Diamond powder and iron filings powder attached to the surface of the steel ball are removed as much as possible to ensure the accuracy of the subsequent weighing.

[0032] Preferably, the steel balls are GCr15 bearing steel balls, and the ball mill is made of 304 stainless steel.

[0033] Preferably, the steel ball is made of carbon steel ball with low wear resistance, and the ball mill is made of material with high wear resistance. In this way, the grinding amount of the steel ball can be larger, that is, △mc and △m are both larger, thereby reducing the error amount and obtaining a more reliable D value.

[0034] The beneficial technical effects of the present invention are:

[0035] The diamond micropowder grinding performance detection method of the present invention comprises the following steps: firstly, a steel ball of a certain fixed weight is used as a ball milling medium and mixed with a diamond micropowder standard sample for ball milling; then, the wear amount △m of the steel ball after ball milling is measured by weighing; and then, the standard diamond micropowders of various D50 values ​​are repeatedly ball milled to obtain the standard wear amounts △m1 to △m1 corresponding to the standard diamond micropowders of various D50 values. n During the test, a certain diamond powder to be tested is ball-milled for the same time using the same ball mill and the same weight of steel balls, and the wear amount of the steel balls after ball milling is weighed and tested. The grinding amount △m of the standard sample corresponding to the D50 of the diamond powder to be tested is found or calculated, that is, △m1~△m n one of them; set the grinding performance to be represented by D, D=△mc / △m; the larger the D value, the better the grinding performance of the diamond micropowder to be tested, and the smaller the D value, the worse the grinding performance of the diamond micropowder to be tested.

[0036] This method establishes the standard wear volume △m1~△m corresponding to different D50 through absolute wear volume. n， This is used as a comparison benchmark to judge the grinding performance of the diamond powder to be tested. The judgment process is based on objective values. Compared with the existing technology of judging by the morphology of diamond powder, it has high accuracy and reference value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the fitting equation established in Example 3 according to the grinding amount of the standard sample corresponding to the diamond micropowder with different D50 values ​​in Table 1;

[0038] Figure 2 This is a schematic diagram of the linear equation established when the D50 value of the standard sample diamond powder in Example 2 is between 7μm and 8μm. DETAILED DESCRIPTION

[0039] Embodiment 1: A method for detecting the grinding performance of diamond micropowder, comprising the following steps: ① Obtaining a diamond micropowder standard sample

[0040] The micro powder made of diamond single crystal with a particle size of 35 to 60 meshes before crushing and a TI value of 50 to 60 is selected; the diamond single crystal used to make the diamond micro powder standard sample is limited by the particle size and TI value to ensure the stability of the raw material performance, thereby ensuring the stability of the performance of the standard micro powder, and the established detection comparison standard is referenceable. In this embodiment, the Huanghe Cyclone HHM-B series micro powder is selected and made of a type 1 and a half material produced by Huanghe Cyclone as raw material, with moderate strength and stable quality.

[0041] Select diamond powder with different D50 values ​​and record them as standard samples x1~x n In this embodiment, 3μm≤D50≤50μm, starting from 3μm, adding 1μm repeatedly to 50μm, the corresponding standard samples are x3~x 50 . See Table 1.

[0042] ② The crushing media and crushing equipment are determined, fixed, and the same ones are used when establishing the basic grinding amount and testing. The data obtained from the test are of reference value.

[0043] The volume of the ball mill is determined to be 80 ml, the rotation speed is 1200 r / min, the crushing medium is selected as steel balls, the diameter of the steel balls is uniformly Dq=8 mm, and the total weight of 25 steel balls is 52.1300 g; the steel balls are GCr15 bearing steel balls, and the ball mill jar is made of 304 stainless steel.

[0044] ③Ball milling

[0045] Weigh 20 g ± 0.01 g of the diamond powder sampled in step ①, mix it with the steel balls selected in step ② and put it into a ball mill for 30 min;

[0046] ④Weighing after ball milling

[0047] After step ③ is completed and ball milling is finished, the ball mill jar is removed and the diamond powder is separated with a 200-mesh screen. The steel balls are cleaned with deionized water and ultrasonic for 20 minutes. After being rinsed clean, they are dried at 105°C for 10 minutes. After cooling, the total weight of the steel balls is weighed.

[0048] ⑤ Standard sample grinding amount

[0049] Repeat steps ③-④ three times, calculate the average value mh of the total weight of the steel balls after three ball millings, and calculate the grinding amount of the standard sample △m=mq–mh;

[0050] ⑥ Obtain the grinding amount of different D50 diamond powder standards

[0051] For the standard samples x1~x in step ① n Carry out steps ③-⑤ in sequence, and the grinding amount of the standard samples obtained is △m3~△m n ;

[0052] Table 1 Grinding amount of standard samples corresponding to diamond powders with different D50 values

[0053] serial number x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 D50 1μm 2μm 3μm 4μm 5μm 6μm 7μm 8μm 9μm 10μm △m 0.3513 0.4322 0.7168 0.6391 0.6181 0.5862 0.5633 0.5372 serial number x11 x12 x13 x14 x15 x16 x17 x18 x19 x20 D50 11μm 12μm 13μm 14μm 15μm 16μm 17μm 18μm 19μm 20μm △m 0.5054 0.4465 0.4076 0.3257 0.2865 0.2356 0.2042 0.1809 0.1711 0.1655 serial number X21 X22 X23 X24 X25 X26 X27 X28 X29 X30 D50 21μm 22μm 23μm 24μm 25μm 26μm 27μm 28μm 29μm 30μm △m 0.1623 0.1630 0.1587 0.1512 0.1454 0.1428 0.1366 0.1342 0.1336 0.1321 serial number X31 X32 X33 X34 X35 X36 X37 X38 X39 X40 D50 31μm 32μm 33μm 34μm 35μm 36μm 37μm 38μm 39μm 40μm △m 0.1320 0.1301 0.1276 0.1263 0.1260 0.1231 0.1211 0.1165 0.1152 0.1102 serial number X41 X42 X43 X44 X45 X46 X47 X48 X49 X50 D50 41μm 42μm 43μm 44μm 45μm 46μm 47μm 48μm 49μm 50μm △m 0.1069 0.1062 0.1041 0.1010 0.0987 0.0982 0.0963 0.0935 0.0923 0.0926

[0054] ⑦ Grinding performance test of the diamond powder to be tested

[0055] 71.Measure the D50 value of the diamond powder to be tested.

[0056] 72. Weigh the diamond powder to be tested in step 71 with a weight of M, and perform ball milling in step ② to determine the crushing medium and crushing equipment, and rotate for a rotation time of T; after completion, take out the steel balls from the ball mill, screen, clean and dry the steel balls, and weigh them to obtain the total weight of the steel balls after ball milling.

[0057] Repeat the ball milling three times, calculate the average value mc of the total weight of the steel balls after three ball millings, and calculate the actual grinding amount of the diamond powder to be tested △mc=mq–mc;

[0058] 73. Calculate grinding performance D

[0059] Find the grinding amount △m of the standard sample D50 corresponding to the diamond powder D50 to be tested in step ⑥, that is, △m1~△m n One of them; set the grinding performance to be represented by D, D = △mc / △m.

[0060] Embodiment 2: Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated. The difference is that step 71 described in Embodiment 2 is replaced by: when the D50 value of the diamond powder to be measured is between the standard sample x n-1 and x n The D50 value is between , so according to the corresponding △m n-1 and △m n , establish a linear function for fitting the two sets of data, △m=k·D50+b; the range of the independent variable is standard sample x n-1 D50 value to x n The D50 value of the variable ranges from △m n-1 To △m n；

[0061] The corresponding step 73 is replaced by: taking the D50 value of the diamond powder to be tested as the independent variable, and calculating the corresponding △m according to the above linear function; setting the grinding performance to be represented by D, D=△mc / △m.

[0062] In this embodiment, four diamond powders to be tested are selected, and their D50 are 7.147 μm, 7.078 μm, 7.132 μm, and 7.168 μm, respectively.

[0063] Table 2 D value of the diamond powder to be tested

[0064]

[0065] See also Figure 2 , y=-0.0319x+0.8414 in the figure, which is the linear function in Table 2.

[0066] According to the test conclusions obtained in Table 2, the D values ​​of the four diamond powders to be tested in this embodiment are all greater than 1, indicating that the grinding performance is good.

[0067] Embodiment 3: Embodiment 3 is basically the same as Embodiment 1, and the similarities are not repeated. The difference is that step ⑥ described in Embodiment 3 is followed by

[0068] Step 61: Use the standard samples x3 to x in Example 1 n D50 is used as the independent variable, and the standard sample grinding amount is △m3~△m n As a variable, the function △m=f(D50) is fitted, see the attached Figure 1 In the function in the figure, y is △m, x is D50; the function expression is: y=A1·exp(-x / t1)+y0, where (y0=0.07869, A1=0.97616, t1=11.76156).

[0069] The corresponding step 73 is replaced by: taking the D50 value of the diamond powder to be tested as the independent variable, and calculating the corresponding △m according to the function in the above step 60; setting the grinding performance to be represented by D, D=△mc / △m.

[0070] The steel balls in the above-mentioned embodiments 1 to 3 can be carbon steel balls with low wear resistance, and the ball mill jar is made of a material with high wear resistance, which can form more embodiments; the grinding amount of the steel balls obtained in this way can be larger, and the measured △mc and △m are both larger, thereby reducing the error amount and the reliability of the obtained D value is higher.

Claims

1. A method for testing the grinding performance of diamond micropowder, Its characteristics include the following steps: ①. Obtaining diamond micro powder standard sample Select the micro powder made of diamond single crystal with a particle size of 35 to 60 mesh before crushing and a TI value of 50 to 60; select diamond micro powder with different D50 values ​​and record them as standard samples x1~x n ,; ② Determination of crushing media and crushing equipment Determine the ball mill volume as X ml, the speed as Zr / min, select the crushing medium as steel balls, the diameter of the steel balls is unified as Dq, and the total weight of N steel balls is mq; ③Ball milling Weigh the diamond powder sampled in step ① with a weight of M, mix it with the steel balls selected in step ② and put it into a ball mill for a rotation time of T; ④Weighing after ball milling After step ③ is completed, the steel balls are taken out from the ball mill, sieved, cleaned, and dried, and weighed to obtain the total weight of the steel balls after ball milling. ⑤ Standard sample grinding amount Repeat steps ③-④ three times, calculate the average value mh of the total weight of the steel balls after three ball millings, and calculate the grinding amount of the standard sample △m=mq–mh; ⑥ Obtain the grinding amount of different D50 diamond powder standards For the standard samples x1~x in step ① n Carry out steps ③-⑤ in sequence, and the grinding amount of the standard samples obtained is △m1~△m n ; ⑦ Grinding performance test of diamond powder to be tested 71.Measure the D50 value of the diamond powder to be tested.

72. Weigh the diamond powder to be tested in step 71 with a weight of M, and perform ball milling in step ② to determine the crushing medium and crushing equipment, and rotate for a rotation time of T; after completion, take out the steel balls from the ball mill, screen, clean and dry the steel balls, and weigh them to obtain the total weight of the steel balls after ball milling. Repeat the ball milling three times, calculate the average value mc of the total weight of the steel balls after three ball millings, and calculate the actual grinding amount of the diamond powder to be tested △mc=mq–mc; 73. Calculate grinding performance D Find the grinding amount △m of the standard sample D50 corresponding to the diamond powder D50 to be tested in step ⑥, that is, △m1~△m n One of them; set the grinding performance to be represented by D, D = △mc / △m.

2. The method for detecting the grinding performance of diamond micropowder according to claim 1, characterized in that: The step 71 is replaced by: when the D50 value of the diamond powder to be tested is between the standard sample x n-1 and x n The D50 value is between , so according to the corresponding △m n-1 and △m n , establish the linear function of the two sets of data, △m=k·D50+b; the range of the independent variable is the standard sample x n-1 D50 value to x n The D50 value of the variable ranges from △m n-1 To △m n； The corresponding step 73 is replaced by: taking the D50 value of the diamond powder to be tested as the independent variable, and calculating the corresponding △m according to the above linear function; setting the grinding performance to be represented by D, D=△mc / △m.

3. The method for detecting the grinding performance of diamond micropowder according to claim 1, characterized in that: Step 61 is followed by step 62: using standard samples x1 to x n D50 is used as the independent variable, and the standard sample grinding amount is △m1~△m n As a variable, the function △m=f(D50) is fitted; The corresponding step 73 is replaced by: taking the D50 value of the diamond powder to be tested as the independent variable, and calculating the corresponding △m according to the function in the above step 61; setting the grinding performance to be represented by D, D=△mc / △m.

4. The method for detecting the grinding performance of diamond micropowder according to claim 1, characterized in that: The 1μm≤D50≤50μm, starting from 1μm, increase by 1μm repeatedly until 50μm, the corresponding standard samples are x1~x 50 .

5. The method for detecting the grinding performance of diamond micropowder according to claim 1, characterized in that: The M is ≤30g.

6. The method for detecting grinding performance of diamond micropowder according to claim 1, characterized in that: The ball mill has a capacity of 0-100 ml, a rotation speed of 1200 r / min, a uniform diameter of the steel balls of 5-10 mm, and a ball milling time of T=30 min.

7. The method for detecting grinding performance of diamond micropowder according to claim 1, characterized in that: In the step ④, the cleaning is performed by using deionized water and ultrasonic cleaning for 10 to 30 minutes; and the drying is performed by drying at 100 to 110° C. for 10 to 20 minutes.

8. The method for detecting grinding performance of diamond micropowder according to claim 1, characterized in that: The steel balls are GCr15 bearing steel balls, and the ball mill is made of 304 stainless steel.

9. The method for detecting grinding performance of diamond micropowder according to claim 1, characterized in that: The steel balls are made of carbon steel balls with low wear resistance, and the ball mill is made of a material with high wear resistance.

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