JJG 150-2005 Verification Procedure for Metal Brinell Hardness Tester JJG150-2005 Standard download decompression password: www.bzxz.net
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of fixed metal Brinell hardness tester.

National Metrology Verification Regulation of the People's Republic of China JJG150—2005
Metallic Brinell Hardness Testers
Metallic Brinell Hardness Testers2005-03-03 Issued
Implementation on 2005-09-03
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG150—2005
Verification Regulation of Metallic Brinell Hardness Testers
JJG150—2005
Replaces JJG150—1990
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on March 3, 2005, and came into effect on September 3, 2005.
Responsible unit: National Technical Committee on Force and Hardness Metrology Drafting unit: Shanghai Institute of Metrology and Testing Technology, China National Institute of Metrology
This regulation entrusts the National Technical Committee on Force and Hardness Metrology to be responsible for interpreting this regulation Main drafters:
Liu Jiping
Yu Weiliang
Participating drafters:
Liu Lianqiu
JJG150—2005
(China National Institute of Metrology)
(Shanghai Institute of Metrology and Testing Technology) (China National Institute of Metrology)
References
Metrological performance requirements
Verticality and coaxiality of the spindle of the hardness tester
Test force of the hardness testerwww.bzxz.net
Indentation measuring device
JJG150—2005
Indication 4.5 Maximum allowable error and indication repeatability
5 General technical requirements
5.1 Appearance, installation and requirements
5.2 Test force application speed and test cycle time 6 Control of measuring instruments
6.1 Verification conditions
6.2 Verification items and verification methods
6.3 Processing of verification results
6.4 Verification cycle
Appendix A Verification record format of test force and indication of Brinell hardness tester Appendix B Inner page format of verification certificate and verification result notification of Brinell hardness tester (1)
1 Scope
JJG150—-2005
Verification procedure for metal Brinell hardness tester
This procedure applies to the initial verification, subsequent verification and in-use inspection of fixed metal Brinell hardness tester (hereinafter referred to as hardness tester).
2 References
IS06506—1Metallic materials-Brinell hardness test-part1Test methodGB/T231.1-2002Metallic Brinell hardness test-Part 1: Test methodGB/T231.2-2002Metallic Brinell hardness test-Part 2: Inspection and calibration of hardness testerGB/T231.3-2002Metallic Brinell hardness test-Part 3: Calibration of standard hardness blockJJG144—1992
Standard dynamometer verification procedure
When using this procedure, attention should be paid to using the current valid version of the above references. 3 Overview
Brinell hardness tester is mainly suitable for the determination of hardness of cast iron, steel, non-ferrous metals and soft alloys. In addition, it can also be used to determine the hardness of certain non-metallic materials such as plastics and bakelite. A carbide ball of a certain diameter is pressed into the surface of the specimen under the action of a specified test force. After a certain test force holding time, the test force is removed and the diameter of the indentation left on the surface of the specimen is measured. The Brinell hardness value is expressed as the average pressure on the surface area of ​​the indentation.
The upper limit of the Brinell hardness test range is 650HBW. The material of the ball indenter for the Brinell hardness test is carbide. The Brinell hardness symbol is HBW, which is used to distinguish the symbols HB or HBS when the indenter used a steel ball. 4 Performance requirements for the hardness tester
4.1 Verticality and coaxiality of the hardness tester spindle
4.1.1 The verticality of the hardness tester spindle and the test bench surface shall not exceed 0.2/100. 4.1.2 The coaxiality of the lifting screw axis and the spindle axis shall not exceed $0.5mm. 4.2 Hardness tester test force
4.2.1 The test force shall select the nominal value specified in Table 1. 4.2.2 The permissible error of each level of test force of the hardness tester shall be within ±1.0% of the nominal value of the test force. 4.3 Indenter
For the technical requirements of the indenter, see Table 2.
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 permissible error of the indentation measuring device is ±0.5%. 2
Hardness symbol
HBW10/3000
HBW10/1500
HBW10/1000
HBW10/500
HBW10/250
HBW10/100
HBW5/750
HBW5/250
H BW5/125
HBW5/62.5
HBWS/25
HBW2.5/187.5
HBW2:5/62.5
HBW2.5/31.25
HBW2.5/15.625
HBW2.5/6.25||tt| HBW1/30|| tt||HBW1/10
HBW1/5
HBW1/1
Ball indenter diameter/mm
JJG150—2005
Table 1 Test force
Ratio of test force to indenter ball diameter
Indenter diameter D/mm
square
0.102×F/D2
Table 2 Technical requirements for indenters
Maximum allowable error/mm
Surface roughness R,/um
Test force
Ball indenter hardness (HV10)
≥1500
JJG150—2005
4.5 Maximum allowable error of indication and repeatability of indication The requirements for the maximum allowable error of indication and repeatability of indication of hardness tester are shown in Table 3. Table 3 Maximum allowable error of indication and repeatability of indication of hardness tester Hardness range (HBW)
125HBW225
5 General technical requirements
5.1 Appearance, installation and requirements
Maximum allowable error of indication8/%
Repeatability of indicationH/%
5.1.1 The hardness tester shall have a nameplate indicating the product name, product model, number, name of the manufacturer and the year and month of manufacture. Newly manufactured hardness testers should also be marked.
5.1.2 The hardness tester should be installed on a stable foundation and adjusted to meet the technical requirements as required. 5.1.3 The spindle, force-applying mechanism, buffer mechanism and measuring device of the hardness tester should all be able to work normally and flexibly; the test force should be applied and unloaded smoothly without vibration or jamming; the screw should not shake when it is lifted or lowered. 5.1.4 The hardness test bench should be firmly installed on the screw, and the test bench surface should be smooth and flat. 5.1.5 The protruding part of the ball indenter should 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 when it just contacts the test piece. The requirement is not more than 1mm/s. The test cycle time refers to the test force holding time and the test force application time. The maximum allowable error of the test force cycle time is ±0.5s.
6 Measuring instrument control
Measuring instrument control includes: initial calibration, subsequent calibration and in-use inspection. 6.1. Verification conditions
6.1.1 Environmental conditions
The hardness tester shall be verified under the environmental conditions of (23±5)℃. When the subsequent verification or in-use inspection of the hardness tester is carried out outside this temperature, the environmental temperature shall not be lower than 10℃ and not higher than 35℃. The temperature during verification shall be indicated in the verification record and verification certificate.
6.1.2 During verification, the surrounding environment shall be clean, free of vibration and corrosive gas. 6.1.3 Verification instruments
The verification instruments are shown in Table 4.
6.2 Verification items and verification methods
The verification items are shown in Table 5.
The subsequent verification of the hardness tester shall be carried out in accordance with the methods of 6.2.1 and 6.2.8 of the control of measuring instruments. If the indication verification fails, the measuring instrument control shall be carried out in accordance with 6.2.2, 6.2.3, 6.2.4, 6.2.5, 6.2.6 and 6.2.7 is used for verification and adjustment.
Verification Items
Horizontalness of hardness tester workbench
Verticality of hardness tester spindle and test table
Coaxiality of lifting screw axis and spindle axis
Test force
Ball diameter
Surface roughness
Ball hardness
Indentation measuring device
Test force application speed and test
Cycle time
Indication error and indication repeatability
JJG150-2005
Table 4 Verification instruments
Level
Verification rod
Knife-edge square
Measuring microscope
Rockwell diamond indenter
Rockwell hardness block||tt ||Standard dynamometer
Yu Divider
Vertical optical length gauge
Yu She micrometer
Vickers hardness tester
Standard scale
Dial indicator
Universal stand
Standard hardness block
(9 blocks in 1 set)
Verification equipment
Technical requirements||tt| |Graduation value 0.2/1000
Cylindricity is not more than 0.01mm, effective length is 100mm1 level 100m×60m
(0.02-1)mm
Graduation value: 0.01mm, Level IⅡ
Working pressure head
≥60HRC
Measuring range:
(1~98.07) N
(98.07 ~980.7) N
(980.7 ~2942) N
(2942 ~ 29420)N
Resolution: 0.19
Graduation value: 0.002mm
Graduation value: 0.003mm
Maximum allowable error of indication: ±0.25um
Measuring microscope: (0.08~1.00)μmAccuracy level: 2%~5%
Test force: 98.07N (HV10),
Maximum allowable error of indication: ±0.25um
Measuring microscope: (0.08~1.00)μmAccuracy level: 2%~5%
Test force: 98.07N (HV10),
Maximum allowable error of indication Permissible error: ±3%
Measuring range (0~10) mm
Permissible error of indication: ±0.005 mm
Measuring range (0~1) mm
Permissible error of indication: ±0.002 mm
Resolution: 0.1s
Measuring range: (0~10) 8
HBW10/3000
HBW10/100 0
HBW5/750
HBW5/250
HBW2.5/187.5
HBW2.5/62.5
Hardness range
≤125
Hardness range
Hardness range
Hardness range
Verification items
General technical requirements
Hardness tester spindle Verticality of the test bench surface Coaxiality of the lifting screw axis and the main shaft axis Test force
Ball indenter
Indentation measuring device
Test force application speed and test cycle time Indication error and indication repeatability
JJG150-2005
Table 5 Verification items
First verification
Note: "+" in the table indicates the items to be inspected; "" indicates the items that may not be inspected. Subsequent verification
In-use inspection
6.2.1 According to Chapter 5 of this regulation, the general technical requirements shall be checked through actual operation and visual inspection. After the inspection meets the requirements, the verification of other items shall be carried out. 6.2.2 Verification of the verticality of the hardness tester spindle and the test bench surface Install the calibration rod firmly on the spindle, and measure in two directions perpendicular to each other with a square ruler and a feeler gauge. The maximum value of the measured result shall meet the requirements of 4.1.1. 6.2.3 Verification of the coaxiality between the lifting screw axis and the spindle axis Place the standard hardness block on the test bench, then slowly raise the test bench so that the top of the Rockwell diamond indenter contacts the standard hardness block and produces a small indentation on the standard block, and then lower the test bench. In the same way, under the condition that the relative position between the standard hardness block and the test bench surface is strictly unchanged, make an indentation every 90° rotation of the test bench, and make a total of 4 indentations. Measure the distance between the two indentations, of which the maximum distance is the coaxiality, which should meet the requirements of 4.1.2. 6.2.4 Verification of test force
6.2.4.1 Pre-press the force measuring instrument 3 times with the maximum test force of the hardness tester to be tested, then adjust the zero position and start testing. 6.2.4.2 The movement direction of the test force during verification should be consistent with the movement direction of the test force during the test, and the test should be carried out at 3 positions within the entire travel range of the test force. Measure 3 times at each position. The test force error is calculated according to (1):
Wherein: W is the test force error;
K-Ko×100
K. - The standard dynamometer indication corresponding to the test force: K--the reading with the largest difference from K among the three readings. The test force verification W result shall meet the requirements of 4.2.2. 6.2.5 Verification of the indenter
6.2.5.1 Appearance inspection of the ball indenter
Observe the surface state of the ball under a stereo microscope with a magnification of 100 times. There shall be no defects such as pitting, scratches, cracks, rust, etc. on the ball surface. Use an interference microscope to measure its surface roughness. It shall meet the requirements of 4.3. 5
6.2.5.2 Ball diameter test
JJG150—2005
The ball diameter shall be tested with a vertical optical length measuring instrument. The diameter shall be measured in at least three directions. The three measurement values ​​shall all meet the requirements of 4.3.
6.2.5.3 Ball hardness test
Samples shall be randomly selected from the ball indenters produced in the same batch and tested with a Vickers hardness tester (HV10). The hardness value shall meet the requirements of 4.3. The ball indenters shall be discarded after the test. 6.2.6 Verification of indentation measuring device
Check whether the indentation measuring device has clear and even lines. Use a standard scale to verify the error of the indentation measuring device. When checking, first adjust the focal length so that the lines of the standard scale can be clearly seen in the eyepiece or on the projection screen, and then compare the lines of the moving measuring device with those of the standard scale. The indentation measuring device can be calibrated only within the range of the maximum indentation diameter length (6 mm). The relative error W is calculated according to the following formula (2):
×100%
Wherein: L is the length measured by the measuring device; L is the actual length of the comparison section of the standard scale. (2) The
measuring device is calibrated according to the above method, and its error should meet the requirements of 4.4. The specific position of the calibrated length in the indentation measuring device should be indicated to ensure that the actual measurement work is used within this range. 6.2.7 Calibration of test force application speed and cycle time Use a stopwatch and a standard block (with known thickness) to measure the selected test force application speed and test force cycle time. The results should meet the requirements of 5.6.
6.2.8 Verification of hardness tester indication
6.2.8.1 The Brinell hardness values ​​of 5 points evenly distributed on the standard block shall be measured. The distance between the centers of two adjacent indentations shall not be less than 3 times the diameter of the indentation; the distance from the center of the indentation to the edge of the standard block shall not be less than 2.5 times the diameter of the indentation. The diameter of each indentation shall be measured in two directions perpendicular to each other. The average value shall be taken. The ratio of the difference between the diameters in the two perpendicular directions to the shorter diameter shall not be greater than 1%. 6.2.8.2 Repeatability of hardness tester indication
Make 5 indentations evenly distributed on the standard block and measure them. Calculate according to formula (3): Hax - Ha ×100%
Wherein: H repeatability of hardness tester indication;
Hmax——maximum value of hardness value among 5 points; Hmin——minimum value of hardness value among 5 points;
H,——arithmetic mean of hardness value among 5 points.
6.2.8.3 Hardness tester indication error
The hardness tester indication error is calculated according to formula (4): H
-hardness tester indication error:
Wherein: 8
×100%
JJG150—2005
H—hardness tester indication (average value of 5-point hardness test); H—hardness value of hardness block.
The indication repeatability and indication error of the hardness tester shall meet the requirements of 4.5. 6.3 Handling of verification results
A verification certificate shall be issued to the hardness tester that passes the verification according to the requirements of this regulation; a verification result notice shall be issued to the hardness tester that fails the verification.
6.4 Verification cycle
The verification cycle of the hardness tester shall generally not exceed 1 year. Appendix A
JJG150-2005
Brinell hardness tester test force and indication verification record format A,1Brinell hardness tester test force verification record format Inspection unit
Standard instrument
Test force level
Verifier
Factory number
Standard instrument accuracy level
Standard dynamometer
Instrument name
Manufacturer
Technical basis
Test force measurement value of hardness tester under inspection
Relative humidity
Verifier||tt ||Verification date
A.2 Format of verification record of Brinell hardness tester indication Inspection unit
Factory number
Uncertainty of standard hardness block (k=2)
Standard hardness block
Verifier
Hardness value
Hardness tester indication (HBW)
Relative humidity
Verifier
Average value
Verification date
And K. Phase difference
Maximum reading
Instrument name
Manufacturer
Technical basis
Indication error
Appearance inspection
Certificate number
Test force error
Verification cycle
Appearance inspection
Certificate number
Indication repeatability
Verification cycle
Verification conclusion
Verification conclusion
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