JJG 150: Evolution and historical versions
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Metallic Brinell Hardness Testers
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| JJG 150-1990 | English | 239 |
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Verification Regulation of Metal Brinell Hardness Tester
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JJG 150-1990
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Standard similar to JJG 150-2009 JJG 1148 JJG 1149 Basic data | Standard ID | JJG 150-2009 (JJG150-2009) | | Description (Translated English) | Measuring instrument for contact wire geometric parameter | | Sector / Industry | Metrology & Measurement Industry Standard | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | JJG 150-2005: Metallic Brinell Hardness Testers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation of Metallic Brinell Hardness Testers
National Metrological Verification Regulations of the People's Republic of China
Metal Brinell Hardness Tester
2005-03-03 released
2005-09-03 Implementation
Published by the General Administration of Quality Supervision, Inspection and Quarantine
Metal Brinell Hardness Tester Regulations
HardnessTesters
Replaces JJG 150-1990
This procedure was approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 3,.2005, and since.2005
Effective September 3,
Focal unit. National Technical Committee on Force and Hardness Measurement
Drafting unit. Chinese Academy of Metrology
Shanghai Institute of Metrology and Testing Technology
This Regulation entrusts the National Technical Committee on Force and Hardness Measurement to be responsible for interpretation
The main drafters of this regulation.
Jiping Liu (Chinese Academy of Metrology)
Yu Weiliang (Shanghai Institute of Metrology and Testing Technology)
Participating drafters.
Liu Lianqiu (Chinese Academy of Metrology)
table of Contents
1 Scope (1)
2 Citations (1)
3 Overview (1)
4 measurement performance requirements (1)
4.1 Verticality and coaxiality of spindle of hardness tester (1)
4.2 Hardness test force (1)
4.3 Indenter (1)
4.4 Indentation measuring device (1)
4.5 Maximum allowable error of indication value and repeatability of indication value (3)
5 General technical requirements (3)
5.1 Appearance, installation and requirements (3)
5.2 Test force application speed and test cycle time (3)
6 Control of measuring instruments (3)
6.1 Verification conditions (3)
6.2 Verification items and methods (3)
6.3 Processing of verification results (7)
6.4 Verification cycle (7)
Appendix A Brinell Hardness Test Force Verification Record Format (8)
Appendix B Inner page format of Brinell hardness test certificate and test result notification (9)
Metal Brinell Hardness Tester Regulations
1 Scope
This procedure is applicable to the first verification, subsequent verification and subsequent verification of fixed metal Brinell hardness testers (hereinafter referred to as hardness testers).
In-use inspection.
2 Citations
ISO 6506-1 Metalicmaterials-Brinelhardnesstest-part1Testmethod
GB/T 231.1-2002 Metal Brinell Hardness Test Part 1. Test Method
GB/T 231.2-2002 Metal Brinell Hardness Test Part 2. Inspection and Calibration of Hardness Tester
GB/T 231.3-2002 Metal Brinell Hardness Test Part 3. Calibration of Standard Hardness Blocks
JJG 144-1992 Verification Regulations for Standard Force Gauges
When using this procedure, care should be taken to use the currently valid version of the above-cited references.
3 Overview
The Brinell hardness tester is mainly used for the hardness measurement of cast iron, steel, non-ferrous metals and soft alloys. Also OK
Used for the determination of the hardness of certain non-metal materials such as plastic and bakelite.
Using a certain diameter cemented carbide ball, press it into the surface of the test piece under the specified test force.
Remove the test force after the retention time, and measure the diameter of the indentation left on the surface of the test piece.
Brinell hardness value expressed by pressure.
The upper limit of the Brinell hardness test range is 650HBW.
The material of the ball indenter in the Brinell hardness test is cemented carbide. The Brinell hardness symbol is HBW to distinguish it from before
Symbol HB or HBS when using steel ball for indenter.
4 measurement performance requirements
4.1 Verticality and coaxiality of the spindle of the hardness tester
4.1.1 The perpendicularity between the spindle of the hardness tester and the test table is not more than 0.2/100.
4.1.2 The coaxiality between the axis of the lifting screw and the axis of the main shaft is not greater than ϕ0.5mm.
4.2 Hardness test force
4.2.1 The test force shall be selected from the nominal value specified in Table 1.
4.2.2 The allowable error of the test force at all levels of the hardness tester shall be within ± 1.0% of the nominal value of the test force.
4.3 Indenter
See Table 2 for technical requirements of the indenter.
4.4 Indentation measuring device
4.4.1 The resolution of the indentation measuring device shall be less than 0.5% of the indentation diameter.
4.4.2 The allowable error of the indentation measuring device is ± 0.5%.
Table 1 Test force
Hardness symbol indenter diameter D/mm
Test force-indenter ball diameter flat
Square ratio
0.102 × F/D2
Test force
F/N
HBW10/3000 10 30 29420
HBW10/1500 10 15 14710
HBW10/1000 10 10 9807
HBW10/500 10 5 4903
HBW10/250 10 2.5 2452
HBW10/100 10 1 980.7
HBW5/750 5 30 7355
HBW5/250 5 10 2452
HBW5/125 5 5 1226
HBW5/62.5 5 2.5 612.9
HBW5/25 5 1 245.2
HBW2.5/187.5 2.5 30 1839
HBW2.5/62.5 2.5 10 612.9
HBW2.5/31.25 2.5 5 306.5
HBW2.5/15.625 2.5 2.5 153.2
HBW2.5/6.25 2.5 1 61.29
HBW1/30 1 30 294.2
HBW1/10 1 10 98.07
HBW1/5 1 5 49.03
HBW1/2.5 1 2.5 24.52
HBW1/1 1 1 9.807
Table 2 Technical requirements of the indenter
Ball indenter diameter/mm Maximum allowable error/mm Surface roughness Rz/μm Ball indenter hardness (HV10)
2.5
± 0.005
± 0.004
± 0.003
± 0.003
≤0.2 ≥1500
4.5 Maximum allowable error of display value and repeatability of display value
See Table 3 for the maximum allowable error and the repeatability of the displayed value of the hardness tester.
Table 3 The maximum allowable error and repeatability of the displayed value of the hardness tester
Hardness range (HBW) Maximum allowable error δ /% Repeatability Hcf /%
≤125 ± 3 ≤3.5
125 \u003cHBW≤225 ±2.5 ≤3.0
> 225 ± 2 ≤2.5
5 General technical requirements
5.1 Appearance, installation and requirements
5.1.1 The hardness tester shall have a nameplate indicating the product name, product model, serial number, name of the manufacturing unit, and year and month of manufacture.
Newly manufactured hardness testers shall also be marked.
5.1.2 The hardness tester should be installed on a solid foundation and adjusted to meet technical requirements in accordance with regulations.
5.1.3 The spindle, afterburner, cushioning mechanism and measuring device of the hardness tester shall be able to work normally and flexibly;
The loading and unloading test force should be stable, and there should be no chattering or stagnation; there should be no swaying of the screw.
5.1.4 The test bench of the hardness tester shall be firmly installed on the lead screw, and the test bench surface shall be smooth and flat.
5.1.5 The protruding part of the ball indenter shall not be less than 1/3 of its diameter.
5.2 Test force application speed and test cycle time
The test force application speed refers to the speed of the indenter immediately after contacting the test piece. The requirement is no more than 1mm/s.
The test cycle time refers to the test force holding time and the test force application time. Maximum allowable error of test force cycle time
The difference is ± 0.5s.
6 Control of measuring instruments
Control of measuring instruments includes. first verification, subsequent verification and in-use inspection.
6.1 Verification conditions
6.1.1 Environmental conditions
The hardness tester shall be tested under the environmental conditions of (23 ± 5) ℃. Subsequent inspection of the hardness tester outside this temperature
When it is tested during calibration or in use, the ambient temperature should not be lower than 10 ℃ and higher than 35 ℃.
Records and verification certificates.
6.1.2 During the inspection, the surrounding environment shall be clean and free from vibration and corrosive gases.
6.1.3 Testing equipment
See Table 4 for verification equipment.
6.2 Verification items and methods
The verification items are shown in Table 5.
Subsequent verification of the hardness tester shall be carried out in accordance with 6.2.1 and 6.2.8 of the control of measuring instruments. If indicated
Non-conformity shall be checked in accordance with the methods of measuring instruments control 6.2.2, 6.2.3, 6.2.4, 6.2.5, 6.2.6 and 6.2.7
Fix and adjust.
Table 4 Verification equipment
Serial number verification items
Testing equipment
Name technical requirements
1 Level of the hardness table Workbench level value 0.2/1000
Hardness spindle and test bench
Verticality
The cylindricalness of the check rod is not greater than 0.01mm, and the effective length is 100mm
Knife edge square 1 grade 100m × 60m
Feeler (0.02 ~ 1) mm
Lifting screw axis and main shaft
Coaxiality
Measuring microscope graduation value. 0.01mm, class II
Rockwell Diamond Indenter Working Indenter
Rockwell hardness block ≥60HRC
4 Test force
Standard dynamometer
Measuring range.
(1 ~ 98.07) N
(98.07 ~ 980.7) N
(980.7 ~ 2942) N
(2942 ~ 29420) N
0.3 grade
Stopwatch resolution. 0.1s
5 Indenter
Ball diameter
micrometer
Indexing value. 0.002mm
Indexing value. 0.003mm
Maximum allowable error of vertical optical length measuring instrument. ± 0.25μm
Surface roughness interference micrometer
Measuring microscope. (0.08 ~ 1.00) μm
Accuracy level. 2% ~ 5%
Vickers hardness tester
Test force. 98.07N (HV10),
Maximum allowable error of displayed value. ± 3%
6 Standard score rule for indentation measuring device
Measuring range (0 ~ 10) mm
Allowable tolerance of display value. ± 0.005mm
Measuring range (0 ~ 1) mm
Allowable error of display value. ± 0.002mm
Test force application speed and test
circulation time
Stopwatch resolution. 0.1s
Dial indicator measurement range. (0 ~ 10) s
Universal bracket /
8 Indication error and repeatability
Standard hardness block
(1 set total 9 pieces)
HBW10/3000 hardness range
≤225
> 225
HBW10/1000 ≤125
HBW5/750 hardness range
≤225
> 225
HBW5/250 ≤125
HBW2.5/187.5
Hardness range ≤225
Hardness range > 225
HBW2.5/62.5 ≤125
Table 5 Verification items
In-service inspection for the first verification of subsequent verification items
General technical requirements
Verticality of spindle and test bench of hardness tester--
Concentricity of the lifting screw axis and the spindle axis--
Test force--
Ball indenter--
Indentation measuring device--
Test force application speed and test cycle time--
Indication error and repeatability
Note. "" in the table indicates the items that should be inspected; "-" indicates that the items can be omitted.
6.2.1 In accordance with Chapter 5 of this code, conduct general technical requirements inspection through actual operation and visual inspection. Check compliance
After the request, the verification of other items will be carried out.
6.2.2 Verticality Verification of Hardness Tester Spindle and Test Bench
Install the calibration rod firmly on the main shaft, and use a square ruler and feeler to measure in two directions perpendicular to each other.
The maximum value of the measured results shall meet the requirements of 4.1.1.
6.2.3 Verification of the coaxiality of the lifting screw axis and the spindle axis
Place the standard hardness block on the test bench, and then slowly raise the test bench so that the top of the Rockwell diamond indenter is in line with the standard hardness.
The block touches and creates a slight indentation on the standard block, and then lowers the test bench. In the same way, while guaranteeing the standard hardness
Under the condition that the relative position of the block and the test platform is strictly unchanged, the test platform makes an indentation every 90 °, and a total of 4 indentations are made.
Measure the distance between two indentations, where the maximum distance is coaxial and should meet the requirements of 4.1.2.
6.2.4 Verification of test force
6.2.4.1 Preload the force measuring instrument 3 times with the maximum test force of the hardness tester, then adjust the zero position and start the test.
6.2.4.2 The direction of movement of the test force during inspection shall be consistent with the direction of movement of the test force during the test, and
Detect at 3 positions throughout the travel range. Measure 3 times at each position.
The test force error is calculated according to (1).
W = K-K0K0 × 100
(1)
In the formula. W --- test force error;
K0 --- the value of the standard dynamometer corresponding to the test force;
K--The reading with the largest difference from K0 of the 3 readings.
The test force verification W result shall meet the requirements of 4.2.2.
6.2.5 Verification of indenter
6.2.5.1 Visual inspection of ball indenter
Observe the surface state of the ball under a stereo microscope with a magnification of 100 times. The ball surface should be free of pits, scratches, and cracks.
Defects such as grain, rust, etc., were measured with an interference microscope for surface roughness. Should meet the requirements of 4.3.
6.2.5.2 Detection of ball diameter
The diameter of the ball is measured by a vertical optical length measuring instrument.The diameter of the ball must be measured in at least 3 directions.
Meet the requirements of 4.3.
6.2.5.3 Testing of ball hardness
Samples should be taken randomly from ball indenters produced in the same batch and tested with a Vickers hardness tester (HV10).
The value shall meet the requirements of 4.3. The ball indenter after testing should be discarded.
6.2.6 Verification of indentation measuring device
Check whether the score line of the indentation measuring device is clear and uniform.
Check the error of the indentation measuring device with a standard ruler. When checking, adjust the focus so that it is in the eyepiece or projection screen.
The engraving line of the standard engraving ruler can be clearly seen, and then the engraving line of the measuring device and the engraving line of the standard engraving ruler are moved.
Compare. Only the indentation measuring device can be verified in the range of the maximum indentation diameter length (6mm), and its relative error
WL is calculated by pressing (2).
WL = Li-LL × 100%
(2)
Where. Li --- the length measured by the measuring device;
L --- The actual length of the comparison section of the standard ruler.
The measurement device shall be calibrated according to the above method, and its error shall meet the requirements of 4.4. It should be noted that the length tested is
The specific position of the indentation measuring device to ensure that the actual measurement work is used in this range.
6.2.7 Verification of test force application speed and cycle time
Use a stopwatch and a standard block (thickness is known) to measure the selected test force application speed and test force cycle time.
The result should meet the requirements of 5.6.
6.2.8 Verification of displayed value of hardness tester
6.2.8.1 Determination of 5 points of Brinell hardness uniformly distributed on the standard block, the distance between the centers of two adjacent indentations should not be small
3 times the diameter of the indentation; the distance from the center of the indentation to the edge of the standard block should not be less than 2.5 times the diameter of the indentation. Each pressure
The measurement of the trace diameter is performed in two directions perpendicular to each other. Take the average value and the difference between the diameters of the two vertical directions and
The ratio of shorter diameters should not be greater than 1%.
6.2.8.2 Repeatability of displayed value of hardness tester
5 indentations are uniformly distributed on the standard block, and they are measured and calculated according to formula (3).
Hcf =
Hmax-Hmin
× 100% (3)
In the formula. Hcf --- repeatability of the displayed value of the hardness tester;
Hmax--maximum hardness value at -5 points;
Hmin--minimum hardness value at -5 points;
6.2.8.3 Error of hardness tester
The hardness indicator error is calculated according to formula (4).
δ =
× 100% (4)
In the formula. δ --- the hardness meter display value error;
JHj --- hardness meter display value (average of 5 points of hardness test);
The repeatability and error of the displayed value of the hardness tester shall meet the requirements of 4.5.
6.3 Processing of verification results
According to the requirements of this regulation, a qualified hardness tester will be issued, and a verification certificate will be issued.
Notification of results.
6.4 Verification cycle
The test cycle of the hardness tester generally does not exceed one year.
Appendix A
Brinell Hardness Test Force and Indication Verification Record Format
A.1 Record format of Brinell hardness test force test
The name of the instrument
Model factory number Manufacturer appearance inspection
Standard Instrument Standard Instrument Accuracy Grade Technical Basis Certificate Number
Test Force Level
/ N
Standard dynamometer
Indication
(K0)
Tested Hardness Test Force Measured Value
Difference from K0
Maximum reading
(K)
Test force error
/%
Verification conclusion
Relative humidity at room temperature%
Examiner Verification Date Year Month Day Verification Period Year
A.2 Record format for Brinell hardness tester verification
The name of the instrument
Model factory number Manufacturer appearance inspection
Uncertainty of standard hardness block (k = 2)
Standard Hardness Tester (HBW)
Number Hardness Value 1 2 3 4 5 Average
Indication error
/%
Indication repeatability
/%
Verification conclusion
Relative humidity at room temperature%
Examiner Verification Date Year Month Day Verification Period Year
Appendix B
Inner page format of Brinell hardness tester certificate and test result notice
B.1 Inner page format of Brinell hardness test certificate
The measurement standard used
Calibration Standard Certificate Number
Based on technical documents.
Test Force Verification Results
Test force level/N Standard dynamometer display value Hardness test force Maximum reading Test force error /%
Verification result of hardness meter display value
Standard block number Standard value Measured value indication error /% Indication repeatability /%
Temperature. ℃ Relative humidity.%
B.2 Inner page format of notification of Brinell hardness test result
Verification result of hardness meter display value
Standard block number Standard value measurement error /% indication repeatability /% non-conforming item
Verification ambient temperature. ℃ Relative humidity.%
Unqualified items.
5002-
GJJ
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