CN105067461A - Method for improving hardness determination accuracy of large metal parts - Google Patents
Method for improving hardness determination accuracy of large metal parts Download PDFInfo
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- CN105067461A CN105067461A CN201510535411.5A CN201510535411A CN105067461A CN 105067461 A CN105067461 A CN 105067461A CN 201510535411 A CN201510535411 A CN 201510535411A CN 105067461 A CN105067461 A CN 105067461A
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Abstract
Provided is a method for improving the hardness determination accuracy of large metal parts. A fixed Brinell hardness tester and a portable Leeb hardness measurement device are respectively adopted to conduct grouped test measurement on materials and sample blocks the same as the large metal parts, then data processing is conducted on obtained measurement results, and a corrected value corresponding to the portable Leeb hardness measurement device is obtained. When the portable Leeb hardness measurement device is adopted to conduct hardness measurement on the large metal parts, the corresponding corrected value obtained through data processing is adopted to correct the measurement results of the large metal parts so as to improve the accuracy of the measurement results. The advantages of simple operation and high measurement efficiency of the portable Leeb hardness measurement device are kept, and the accuracy and comparability of the measurement results are also improved by means of a test data correction method.
Description
Technical field
The present invention relates to a kind of metal material hardness method for measuring, be specifically related to a kind of method of the raising Determination of Hardness accuracy for band large-scale metal part, belong to field of measuring technique.
Background technology
The hardness number of metal is an integrated performance index combined by a series of different physical quantities of the elasticity, plasticity, toughness etc. of material, its characterizing metal not opposing plastic yield or ability of breaking in large volume on the surface.Metal material hardness method for measuring has a lot, as Brinell hardness, Rockwell's hardness, Vickers hardness and lee ' hardness etc.Can be divided into again fixed apparatus and Portable equipment two kinds from the purposes of testing experiment equipment, the measurement range of different measuring methods testing equipment used, test force, gauge head shape and measuring error are not identical.Fixed testing equipment, as Brinell tester or Vickers etc., be applicable to carry out hardness measurement to miniature parts or sample in laboratory, be characterized in that there is higher accuracy, measured value repeatability is stable, and shortcoming limits to some extent the weight of measurand and size, and also there is higher requirement to its surfaceness.And portable testing equipment, as Dietmar Leeb hardness measuring device, under being applicable to field condition, hardness measurement is carried out to large-scale workpiece, be characterized in lower to the requirement of workpiece surface roughness, the position measured flexibly (different angles can be selected to measure), and shortcoming to be accuracy of measurement poor.
For band large-scale metal part, adopt Dietmar Leeb hardness measuring device to evaluate hardness number and be suitable for the most, but need to solve, the problem that accuracy of measurement is lower.
Summary of the invention
The object of the invention is to, for the defect of prior art, a kind of method of the raising Determination of Hardness accuracy for band large-scale metal part is provided, under simple to operate, the prerequisite of measuring the high feature of efficiency when keeping Dietmar Leeb hardness measuring device to measure band large-scale metal part hardness, improve accuracy of measurement by the mode of test data correction.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of method of the raising Determination of Hardness accuracy for band large-scale metal part, fixed Brinell tester and portable Dietmar Leeb hardness measuring device sample block identical with described band large-scale metal part to material is respectively adopted to carry out group experiment measurement, then data processing is carried out to obtained measurement result, draw the corresponding modified value of described portable Dietmar Leeb hardness measuring device, when adopting portable Dietmar Leeb hardness measuring device to carry out hardness measurement to band large-scale metal part, the measurement result of corresponding modified value to this band large-scale metal part obtained by data processing is adopted to revise, to improve the accuracy of this measurement result.
As further improvement, described method comprises the following steps:
1) preparation of sample block
Process the cylindrical sample block that a block of material is identical with tested band large-scale metal part, the circular upper face of this sample block is measuring surface, and circular lower surface is supporting surface;
2) 15 measurement point of portable Dietmar Leeb hardness measuring device in described measuring surface are adopted to carry out hardness measurement, the impression center of each measurement point and the distance at described measuring surface edge are at least greater than 5mm, distance between adjacent two impression centers is 3mm, averages as measurement result using the measured value of these 15 measurement points;
3) 4 measurement point in the measuring surface of fixed Brinell tester block together are adopted to carry out hardness measurement, the impression center of each measurement point and the distance at described measuring surface edge are at least greater than 2.5 times of the mean diameter of impression, distance between adjacent two impression centers is 3 times of the mean diameter of impression, cast out the measured value of the first measurement point, get the mean value of the measured value of rear three measurement points as measurement result;
4) according to step 2) and step 3) measurement result of gained, calculate the difference between the measurement result of portable Dietmar Leeb hardness measuring device and the measurement result of fixed Brinell tester according to the following formula, as modified value:
The measurement result of the measurement result-portable Dietmar Leeb hardness measuring device of modified value=fixed Brinell tester;
5) adopt portable Dietmar Leeb hardness measuring device to carry out hardness measurement to described band large-scale metal part, obtain the measured value of portable Dietmar Leeb hardness measuring device, obtain accurate measurements by following formula:
Measured value+the modified value of accurate measurements=portable Dietmar Leeb hardness measuring device.
As further improvement, described step 1) in, described sample block meets the following conditions:
A) diameter of described sample block is 100mm, and thickness is 55mm;
B) roughness of the measuring surface of described sample block is Ra≤0.8, and the roughness of supporting surface is Ra≤1.6;
C) depth of parallelism≤0.05mm of described measuring surface and supporting surface.
As further improvement, described step 2) in, 15 described measurement points distribute symmetrically along three limits of the equilateral triangle being positioned at described measuring surface central authorities.
As further improvement, described step 3) in, 4 described measurement points are positioned at described measuring surface central authorities and distribute symmetrically.
The present invention is by taking test measure, before hardness is measured to band large-scale metal part, for the metal material of dual extension-compression modulus, find out the objective law of measurement data difference between portable Dietmar Leeb hardness measuring device and fixed Brinell tester, then when to the actual measurement of band large-scale metal part, according to modified value, measurement data is revised, thus obtain the measurement result of high accuracy, both the simple to operate of portable Dietmar Leeb hardness measuring device had been maintained, measure the advantage that efficiency is high, accuracy and the comparability of measurement result is improve again by the method for test data correction.
Accompanying drawing explanation
Fig. 1 is method flow schematic diagram of the present invention.
Fig. 2 is the schematic diagram of sample block of the present invention.
Fig. 3 is the measurement point distribution figure of portable Dietmar Leeb hardness measuring device on sample block.
Fig. 4 is the measurement point distribution figure of fixed Brinell tester on sample block.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all should belong to protection scope of the present invention.
The method of the raising Determination of Hardness accuracy for band large-scale metal part of the present invention, fixed Brinell tester and portable Dietmar Leeb hardness measuring device sample block identical with described band large-scale metal part to material is respectively adopted to carry out group experiment measurement, then data processing is carried out to obtained measurement result, draw the corresponding modified value of described portable Dietmar Leeb hardness measuring device, when adopting portable Dietmar Leeb hardness measuring device to carry out hardness measurement to band large-scale metal part, the measurement result of corresponding modified value to this band large-scale metal part obtained by data processing is adopted to revise, to improve the accuracy of this measurement result.
Described method comprises the following steps, and refers to Fig. 1:
1) preparation of sample block
Refer to Fig. 2, process the cylindrical sample block 1 that a block of material is identical with tested band large-scale metal part, the circular upper face of this sample block 1 is measuring surface 11, and circular lower surface is supporting surface; Described sample block 1 meets the following conditions:
A) diameter of described sample block 1 is 100mm, and thickness is 55mm;
B) roughness of the measuring surface 11 of described sample block 1 is Ra≤0.8, and the roughness of supporting surface is Ra≤1.6;
C) depth of parallelism≤0.05mm of described measuring surface 11 and supporting surface.
2) 15 measurement point of portable Dietmar Leeb hardness measuring device in described measuring surface 11 are adopted to carry out hardness measurement, refer to Fig. 3,15 described measurement points distribute symmetrically along three limits of the equilateral triangle being positioned at described measuring surface 11 central authorities, the impression center of each measurement point and the distance at described measuring surface edge are at least greater than 5mm, and the distance between adjacent two impression centers is 3mm; The measured value of these 15 measurement points is averaged as measurement result.
3) 4 measurement point in the measuring surface 11 of fixed Brinell tester block 1 together are adopted to carry out hardness measurement, refer to Fig. 4,4 described measurement points are positioned at described measuring surface 11 central authorities and distribute symmetrically, the impression center of each measurement point and the distance at described measuring surface edge are at least greater than 2.5 times of the mean diameter of impression, and the distance between adjacent two impression centers is 3 times of the mean diameter of impression; Cast out the measured value of the first measurement point, get the mean value of the measured value of rear three measurement points as measurement result;
4) according to step 2) and step 3) measurement result of gained, calculate the difference between the measurement result of portable Dietmar Leeb hardness measuring device and the measurement result of fixed Brinell tester according to the following formula, as modified value:
The measurement result of the measurement result-portable Dietmar Leeb hardness measuring device of modified value=fixed Brinell tester;
5) adopt portable Dietmar Leeb hardness measuring device to carry out hardness measurement to described band large-scale metal part, obtain the measured value of portable Dietmar Leeb hardness measuring device, obtain accurate measurements by following formula:
Measured value+the modified value of accurate measurements=portable Dietmar Leeb hardness measuring device.
Embodiment:
Sample block is casting pig (C3Cu), and experimental data processing is as follows:
1) the cylindrical sample block 1 identical with tested band large-scale metal part that a block of material is casting pig (C3Cu) is processed;
2) average of the measured value of 15 measurement points adopting portable Dietmar Leeb hardness measuring device to record is: HBHLD=191;
3) together, block 1 measures 4 measurement points with fixed Brinell tester, wherein the average of rear 3 measured values is: HBW10/3000/15=202;
4) then: modified value=202-191=11HB;
5) when adopting portable Dietmar Leeb hardness measuring device to measure large-scale grey iron (C3Cu) workpiece, need add that modified value (11HB) is revised by recording result, measurement result more accurately can be obtained.
Claims (5)
1. the method for the raising Determination of Hardness accuracy of band large-scale metal part, it is characterized in that: adopt fixed Brinell tester and portable Dietmar Leeb hardness measuring device sample block identical with described band large-scale metal part to material respectively to carry out group experiment measurement, then data processing is carried out to obtained measurement result, draw the corresponding modified value of described portable Dietmar Leeb hardness measuring device, when adopting portable Dietmar Leeb hardness measuring device to carry out hardness measurement to band large-scale metal part, the measurement result of corresponding modified value to this band large-scale metal part obtained by data processing is adopted to revise, to improve the accuracy of this measurement result.
2. the method for the raising Determination of Hardness accuracy for band large-scale metal part according to claim 1, is characterized in that: described method comprises the following steps:
1) preparation of sample block
Process the cylindrical sample block that a block of material is identical with tested band large-scale metal part, the circular upper face of this sample block is measuring surface, and circular lower surface is supporting surface;
2) 15 measurement point of portable Dietmar Leeb hardness measuring device in described measuring surface are adopted to carry out hardness measurement, the impression center of each measurement point and the distance at described measuring surface edge are at least greater than 5mm, distance between adjacent two impression centers is 3mm, averages as measurement result using the measured value of these 15 measurement points;
3) 4 measurement point in the measuring surface of fixed Brinell tester block together are adopted to carry out hardness measurement, the impression center of each measurement point and the distance at described measuring surface edge are at least greater than 2.5 times of the mean diameter of impression, distance between adjacent two impression centers is 3 times of the mean diameter of impression, cast out the measured value of the first measurement point, get the mean value of the measured value of rear three measurement points as measurement result;
4) according to step 2) and step 3) measurement result of gained, calculate the difference between the measurement result of portable Dietmar Leeb hardness measuring device and the measurement result of fixed Brinell tester according to the following formula, as modified value:
The measurement result of the measurement result-portable Dietmar Leeb hardness measuring device of modified value=fixed Brinell tester;
5) adopt portable Dietmar Leeb hardness measuring device to carry out hardness measurement to described band large-scale metal part, obtain the measured value of portable Dietmar Leeb hardness measuring device, obtain accurate measurements by following formula:
Measured value+the modified value of accurate measurements=portable Dietmar Leeb hardness measuring device.
3. the method for the raising Determination of Hardness accuracy for band large-scale metal part according to claim 2, is characterized in that: described step 1) in, described sample block meets the following conditions:
A) diameter of described sample block is 100mm, and thickness is 55mm;
B) roughness of the measuring surface of described sample block is Ra≤0.8, and the roughness of supporting surface is Ra≤1.6;
C) depth of parallelism≤0.05mm of described measuring surface and supporting surface.
4. the method for the raising Determination of Hardness accuracy for band large-scale metal part according to claim 2, it is characterized in that: described step 2) in, 15 described measurement points distribute symmetrically along three limits of the equilateral triangle being positioned at described measuring surface central authorities.
5. the method for the raising Determination of Hardness accuracy for band large-scale metal part according to claim 2, is characterized in that: described step 3) in, 4 described measurement points are positioned at described measuring surface central authorities and distribute symmetrically.
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Cited By (5)
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| CN106282861A (en) * | 2016-08-26 | 2017-01-04 | 龙口市丛林铝材有限公司 | A kind of method for quick of aluminium alloy round cast ingot uniformization effect |
| CN110031281A (en) * | 2019-04-17 | 2019-07-19 | 中冶建筑研究总院有限公司 | A kind of method of determining steel type |
| CN110231238A (en) * | 2019-05-30 | 2019-09-13 | 吉林省维尔特隧道装备有限公司 | The gradient rigidity detection device and method in development machine hobboing cutter cutter ring section |
| CN112284949A (en) * | 2020-10-26 | 2021-01-29 | 温州展业建设工程有限公司 | Hardness detection construction method for house construction |
| CN113433014A (en) * | 2021-06-25 | 2021-09-24 | 西安热工研究院有限公司 | Method for confirming on-site hardness correction coefficient of boiler tube |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106282861A (en) * | 2016-08-26 | 2017-01-04 | 龙口市丛林铝材有限公司 | A kind of method for quick of aluminium alloy round cast ingot uniformization effect |
| CN110031281A (en) * | 2019-04-17 | 2019-07-19 | 中冶建筑研究总院有限公司 | A kind of method of determining steel type |
| CN110031281B (en) * | 2019-04-17 | 2021-08-06 | 中冶建筑研究总院有限公司 | Method for determining steel type |
| CN110231238A (en) * | 2019-05-30 | 2019-09-13 | 吉林省维尔特隧道装备有限公司 | The gradient rigidity detection device and method in development machine hobboing cutter cutter ring section |
| CN110231238B (en) * | 2019-05-30 | 2020-04-24 | 吉林省维尔特隧道装备有限公司 | Gradient hardness detection device and method for section of hob ring of heading machine |
| CN112284949A (en) * | 2020-10-26 | 2021-01-29 | 温州展业建设工程有限公司 | Hardness detection construction method for house construction |
| CN113433014A (en) * | 2021-06-25 | 2021-09-24 | 西安热工研究院有限公司 | Method for confirming on-site hardness correction coefficient of boiler tube |
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Application publication date: 20151118 |