Verification Regulation of Metallic superficial Rockwell Hardness Testing Machine
Some standard content:
Verification Regulations for Rockwell Hardness Tester on Metal Surface
JJG 152- 1991
Verification Regulations for Rockwell Hardness Tester on Metal Surface
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Net(: 152—J43
This calibration procedure has been approved by the State Technical Supervision Bureau on May 10, 1991, and has been approved by the State Technical Supervision Bureau on May 10, 1902. The responsible unit is: China Institute of Metrology Drafting unit: China Institute of Metrology Technical provisions of the regulations The main drafter of this regulation:
Zhou Ye (China Planning Science Research Institute)
Additional drafter
Zhu Ercheng (China Testing Technology Research Institute) 141
Technical requirements
Inspection conditions
: Inspection method
4. Inspection station scene processing and inspection cycle
Time recording inspection form
Golden Shield Surface Rockwell Hardness Tester Verification Procedure
This procedure is not applicable to new products, during use and after maintenance. The hardness tester should have a nameplate to indicate the name of the manufacturer, product size, and the end and end of the system: 2. Working conditions
2.1 Normal temperature 10~35t:
2.2 Environmental conditions, especially dynamic:
2.3: No mouth;
2.4 Install it on a stable F base and adjust it to a horizontal position. 3. The main defects of the hardness tester, the force machine, the lifting wire: the machine tree effect deep change test pipe and other normal, Bei active work; test the risk to add to the translation , no accidental impact, temporary movement or jamming phenomenon: the wire fence should not have total movement phenomenon, the test is firmly installed through the Jiangliu table surface must be smooth 4
The verticality of the main axis of the touch meter test bench is not more than 0.2/1(05
The height of the lifting screw axis and the auxiliary axis is not more than 60.3m7
Hardness test requirements
The main test force (29.42>) before and after the main test should be removed. The difference is 12.0%, and the total test force ([47.1N, 244.2N and 44[.3V, the tolerance is =0.7%8 Pressure
The specific pressure head should meet the requirements of the small G334 gold mesh stone pressure head verification regulations. Steel The ball head shall meet the following requirements: the ball hardness is (1.566 ± 0002) mm. The diameter of the ball is greater than 0.2 cm. The steel ball hardness is not less than T850HV10 (the average length of the scale mark is not more than F0.41 mm! The steel ball's surface hardness R is not more than .24 m. The steel ball's steel porcelain part is not less than 13 of its entire back. The depth measurement device of the candelameter is ..1. The influence of the frame deformation and the displacement of the specimen support structure on the reading effect under the large test knife (absolute tolerance) should not be greater than 1.DHR. The tolerance and reproducibility requirements of the hardness test are shown in Table 1. Table 1
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three test methods
14According to the technical specification from Article 1 to Article 4, carry out external test, 15 hardness tester soil axis and test surface of the test extension n - y2 IIR I. 7
The commander will install the machine on the main axis, and test the straightness of the two vertical axes on the two sides. The maximum value of the test results will meet the requirements of Article 5. The 16 lifting wires and the auxiliary wires will be tested for the depth of the main and fine wires. The broken hardness block is placed on the test bench, and the wires are evenly tested, so that the indenter and the reverse indenter are in contact, and a tiny mark is produced on the hardness block. Then the test bench is lowered. According to the same method, under the condition that the relative position of the hardness block and the test bench is strictly unchanged, the test bench will make an indentation on the hardness block every time it rotates, and a total of 4 marks will be made. The distance between the two pairs of indentations is measured, and the maximum distance meets the requirements of Article 6. After the test force is checked, remove the pressure head, put the force gauge with a maximum force of 196.1N on the test bench, align it with the ten axes, pre-strike 3 times, and adjust the zero point. Set the total test force of the instrument to 14?.1N, raise the test gas, and let the indicator indicate the specified end of the test force (within the +5 scale range). The force gauge reading is the initial test force after adding the main test force. If the test force is not applied (the test bench is not opened, only part of the main test force is added), the reading of the instrument is the initial test force after the test force is applied. The error of the test shall be calculated as follows:
W*-g × 100%
During the test: -- the maximum (or minimum) value on the force measuring instrument: -- the standard value of the force measuring instrument.
The result of the test is in accordance with the first, [Property requirements
18 Verification of the total test force
Align the measuring instrument with the rail axis, and press 3: adjust the zero point × each assembly test force, and the position of the output limit should be 15V (T) scale, 50: 30 (! : 80 for scale, 2: 45N ([) scale or 70), not near the position. The movement of the axis during the verification should be consistent with the movement during the test. The total test force error is calculated by formula (1) 11. The result should meet the requirements of Article 7.2. 19. The calibration of the pressure head is carried out according to the "Jinfeng Pressure Head Calibration Procedure". The diameter of the ball and the hardness should be measured on the vertical or optical gauge, and the result should meet the requirements of Article 8.2. 20. The depth measuring device is placed on the test bench and on the test piece. First, the indicator is aligned to the specified position (1 HR), and then the indicator is set at 20, 40 and 8 micro-positions. The depth measuring device is measured for 3 times: When the measurement is completed, the movement of the indicator finger (or engraved load) should be consistent with the movement direction of the test piece. The position error is calculated by the following formula:
2F - U,JU1(HJ) -
: Depth measurement error (rm);
H——Indicator reading (IR):
—-Special test number (rmm) The result should meet the requirements of Article 4,
21 Degree of verification of the influence of frame deformation and displacement of the specimen support mechanism on the reading (2)
Remove the positive, special 3761IIR45>Remaining decision and place it on the test bench 1. Put it on the test bench so that the hardness must be measured and the hardness must be measured without any trace of contact. Add the initial test force to make the indicator Liu align to the specified position of the test force, then add 1.0 test force, the maximum total test force is 441.3V, keep it for 24 seconds, and then remove the test force to read the reading. Test 5 times, the first and second times are not counted. Its value is calculated by the following formula: H - 100H
Wherein,
The influence of frame deformation and specimen support mechanism displacement on reading (HR; is the average value of three hardness tester readings.
Verification results meet the requirements of record 10,
22Special specification of hardness test value
2,1 Before determination: adjust the soil test force application intensity, if the pressure is required by the pressure timer, N and center are based on 5·80H30V intensity block 2-4, the total test force holding time is 58 main test force within 23 minutes, the average reading is:
22.2 Before the test, the test block should be pressed at least 5 times to make all parts of the hardness tester in a working state. 22.3 During the test, the standard block should be moved together with the test table. The distance between the centers of two adjacent indentations and the distance from the center of the indentation to the hardness tester should be not less than 4 and 2.5 times the diameter of the indentation, respectively, but not less than 2mm and 1mm, respectively. 22.4 The cross-sectional area of the hardness block should be aligned with the hardness tester test table. Measure 6 points on the working surface of the standard block, the first point is not counted, and the remaining 5 points are divided equally and the average value is taken. The difference between the average value and the standard resolution value is the indication error of the hardness meter, and the difference between the maximum and minimum values among the 5 points is the repeatability of the hardness meter. They should all meet the requirements in the table of Article 11. 23 The standard must be verified according to the provisions of Articles 14, 16 and 22; if necessary, the verification of other items should be carried out.
24 According to the requirements of Use 6, only one or two scales can be verified, and only one scale must be verified. For the H indication verification, two standards with different hardness ranges must be used, and one of the standards should be as close to the hardness range as possible.
4. Handling of test results and test cycle
25. For hardness testers that meet the requirements of this specification, a test certificate will be issued: for hardness testers that do not meet the requirements of this specification, a test certificate will be issued. The test cycle of the hardness tester is 1469.
The test certificate is recorded on the back in the format of
Test results
Indication test results
Standard evaluation
Weibei Shibo
Indication difference
Small side company
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