JJG 1039-2008 Verification Procedure for D-type Shore Hardness Tester JJG1039-2008 Standard download decompression password: www.bzxz.net
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of D-type Shore hardness tester.

This procedure refers to the following documents:
ISO21509∶2006 Plastic and ebonite-Verification of Shoredurometers
When using this procedure, please pay attention to the current valid version of the above-mentioned referenced documents.
1 Scope (1)
2 References (1)
3 Overview (1)
4 Metrological performance requirements (1)
4.1 Protruding length of the press pin (1)
4.2 Measuring indicator device (1)
4.3 Durability of the press pin (2)
4.4 Surface condition of the press pin (2)
4.5 Technical specifications of the press pin (2)
4.6 Geometric dimensions of the press foot (2)
4.7 Test force (2)
5 General technical requirements (2)
5.1 Appearance (2)
5.2 Indicator device (2)
5.3 Movement of the press pin (3)
6 6.1 Environmental conditions (
3)
6.2 Calibration equipment (3) 6.3
Calibration items (3)
6.4 Calibration method (4)
6.5 Calibration result processing (5)
6.6 Calibration cycle (5)
Appendix AD Shore hardness tester calibration record (6) Appendix
B Calibration certificate inner page format (8)
Appendix C Calibration result notification inner page format (9)

National Metrology Verification Regulation of the People's Republic of China JJG 1039—2008
Type D Durometer
Shore D Durometer
2008 - 03 - 25 Issued
2008 - 06 - 25 Implementation
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG 1039-2008
Verification Regulation of
Shore D Durometer
JJG 1039 --2008
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on March 25, 2008 and came into force on June 25, 2008.
Responsible unit: National Technical Committee on Force and Hardness Metrology Drafting unit: Guangdong Institute of Metrology This regulation is entrusted to the National Technical Committee on Force and Hardness Metrology to interpret this regulation. Main drafters:
JJC1039--2008
He Guanglin (Guangdong Institute of Metrology) Wang Yebin (Eastern Institute of Metrology) Chen Minghua (Guangdong Institute of Metrology) 1
References
Overview·
Metrological performance requirements
Insert needle extension length
Measurement indicator device
Insert needle durability
Insert needle surface condition
[Positive needle technical indicators
|Bed foot geometry
Test force...
General technical requirements
5.1 Appearance
5.2 Indicator
5.3 Movement of needle-
6 Control of measuring instruments..
6.1 Environmental conditions.
6.2 Calibration equipment
Calibration items-
6.4 Calibration method
6.5 Treatment of calibration results
6.6 Calibration cycle
Appendix AD type Shaochang hardness tester calibration record
Appendix B Calibration certificate format
Appendix C
Calibration result notification format
JJG 1039—2008
（1）
（2）
（3）
（6）
J.IG 1039-2008
Verification Procedure for D-type Shore Hardness Tester
This procedure is applicable to the initial verification, subsequent verification and use inspection of D-type Shore Hardness Tester. 2 References
The following references are cited in the minor regulations:
Is0 2l5o9 : 2006 Plastic and plastic Verification of Shore duronmetersWhen using the procedures, please pay attention to the current valid versions of the above references. 3 Overview
The main components of the D-type Shore Hardness Tester are the pressure output, pressure gauge, test force applying mechanism, pressure needle extension length measuring mechanism, indicating device, etc.
I) The basic principle of the Shore hardness test is to press a pin of specified shape and thickness into the sample surface under the test action: when the pressure foot plane is in close contact with the sample surface: measure the extension length of the pressure pin relative to the pressure plane. The Shore hardness is calculated according to the formula (1): HD == 100— 0. 025
Wu: HD):-) Type Shore hardness symbol;
t--Pin extension length, mm.
The test force and D-type Shore hardness should conform to the formula (2) in terms of the numerical relationship: F ​​445 HI)
Formula: F-D type Shore hardness tester test force: mN: (1)
I) Type Shore hardness tester (hereinafter referred to as hardness tester) is suitable for the hardness measurement of high hardness materials such as vulcanized rubber and thermoplastic rubber. It is generally believed that when the measurement value of the A-type Shore hardness tester is higher than 90, the D-type Shore hardness tester should be used. 4 Metrological performance requirements
4.1 Press needle extension length
4.1.1 The maximum extension length of the press needle is (2.500.04)m4.2 Measuring indicating device
The relationship between the extension length of the press needle and the indication value of the hardness gauge shall comply with the requirements of Table 1. Table
Press needle extension length
Maximum extension length of the press needle
When the extension length of the press needle is 2.00 mm
When the extension length of the positive needle is 1.25m
When the extension length of the positive needle is 0mm
Hardness gauge indication value (HD)
50.0= 1.0
100.0±1.0
4.3 Press needle durability
JJG 1039—2008
The needle should have sufficient hardness. The indenter of the hardness tester should be in vertical contact with the plane steel block: after continuous pressure is applied until the pressure foot plane of the hardness tester is closely attached to the plane of the steel block, the indenter should not produce obvious plastic deformation. Note: It is recommended that the hardness of the indenter should not be less than 1500HV. 4.4. Indenter surface condition
The center point of the sphere at the top of the indenter should be on the axis of the indenter, the connection between the sphere surface and the cone surface of the indenter should be smooth, and the sphere surface at the top of the indenter and the cone surface of the indenter should be smooth, without rust, convexity and magnetism. @3.0±0.5
+1.25±0.15
30°+1
Figure D-type Shore hardness tester indenter geometry
4.5 Indenter technical indicators
4. 5. 1 The geometry of the indenter is shown in Figure 1. 4.5.2 The diameter of the pressure needle is (1.25±0.15) mm.4.5.3 The cone angle of the top of the pressure needle is 30°--1°R.1±0.01
1.5.4 The center of the spherical surface of the top of the pressure needle is on the central axis of the pressure needle, and the radius of the spherical surface of the top is (0.1±0.01) mm. 4.6 Geometric dimensions of the pressure foot
The diameter of the circular hole in the middle of the pressure foot is (3.0±0.5) mm, and the distance between the center of the hole and the edge of the pressure foot shall not be less than 6 nt4.7 Test force
The relationship between the test force of the hardness tester and the indication value of the hardness tester shall comply with the requirements of the specification (2), and the allowable deviation of the test force process is ±445 mN.
5 General Technical Requirements
5.1 Appearance
The hardness tester should have a nameplate or logo indicating the model, number, manufacturer, etc. The hardness tester's appearance and the pressure foot plane should not have defects such as rust, burrs, peeling, etc. 5.2 Indicator
5.2, 1. The surface of the analog hardness tester should be transparent and clean; the dial lines should be clear and the scale width should be uniform; the pointer should not be bent and have any contact with the dial or the surface: the width of the pointer tip should not be greater than 2
of the graduation value. With a driven needle
JJG 1039--2008
The hardness tester shall read the indication from the position indicated by the driven needle. The movement of the pointer shall not have any stuck, stagnant or trembling in the whole range.
5.2.2 The indication of the digital indicating device shall be clear, complete, continuous and stable. 5.2.3 The graduation value of the analog hardness tester shall not exceed 2HLD, and the resolution of the digital hardness tester shall not exceed 0.5HD. 5.3 Movement of the limit needle
The movement of the pressure needle shall be flexible and smooth. 6 Measuring instrument control
Measuring instrument control package: initial inspection, subsequent inspection and in-use inspection. 6.1 Environmental conditions
The room temperature for inspection is (23℃-5℃), and the humidity is ≤80%RI1. Before inspection, the hardness tester to be inspected and the inspection instrument used should be placed in the same environmental conditions for at least 1 hour. 6.2 Inspection equipment
See Table 2 for inspection equipment.
Insert needle extension length,
Measurement indicator device and
K Durability
Surface condition of pressure needle,
Diameter, angle
Special gauge block
Flat steel block
1. Microscope
Pressure item end ball and radius: Projector
Pressure foot geometric dimensions
Test force
Verification item H
Vernier caliper
Square measuring instrument
Verification equipment
Technical characteristics
Inch is (2.54)rm. (2.469)rm (2.00±0.004)mm,1.25一(0.001mm There is a through hole with a diameter of 3 mm in the center. (1200-1306)V1
Surface roughness R.0.2um, flatness 2.0μm not less than 50 times, length division value 0.901mm, angle division value 1×100 or 1
Range 150 mm, division value 0.02 mm allowable error ±50 mN
The items for initial inspection, subsequent inspection and inspection during use are shown in Table 3, including the geometric dimensions of the press foot, the durability of the press needle, and the casting inspection.
Verification items
Stretching length of positive needle
Indication value of the measuring indicating device when the pressing needle extends 2.00 mmFirst verification
Subsequent verification
Inspection during use
Verification items
JJG 1039—2008
Table 3 (continued)
First verification
Indication value of the measuring indicating device when the pressing needle extends 1.25 mmIndication value of the measuring indicating device when the pressing needle extends 0 mmDeterioration condition of the pressing needle
Geometric dimensions of the bed needle
Durability of the pressing needleWww.bzxZ.net
Test force
Note: "+" indicates mandatory inspection items, "" indicates optional inspection items. 6.4 Inspection method
6.1.1 Inspection of general technical requirements
Subsequent verification
In-use inspection
Inspection of general technical requirements shall be carried out in accordance with the requirements of Article 5 of this Regulation. Appearance defects that do not affect the metrological performance are allowed for subsequent verification and inspection in use. 6.4.2 Inspection of the protruding length of the pressure needle
Put the special gauge blocks with nominal values ​​of 2.46 mm and 2.54 mm on the flat steel block, hold the hardness tester by hand, and let the pressure needle of the hardness tester pass through the hole of the gauge block. Pressurize until the pressure foot plane of the hardness tester fits tightly with the gauge block plane. When the gauge block with nominal value of 2.46 mm is used, the zero indication of the hardness tester should change; when the gauge block with nominal value of 2. 54 mm is used, the zero indication of the hardness tester should not change. 6.4.3 Verification of measuring indicating device
6.1.3.1 When the hardness tester is in the free state with the hammer pointing downward, the indenter has the largest length, and its indication value shall meet the requirements of Table 1.
6.4.3.2 Place the special gauge block with a nominal value of 2.00mm or 1.25mm on the flat steel block, hold the hardness tester by hand, and let the indenter of the hardness tester pass through the hole of the gauge block: press downward until the indenter plane of the hardness tester and the gauge block plane fit tightly together, and the indication value of the hardness tester shall meet the requirements of Table 1. 6.4.3.3 Hold the hardness tester by hand, let the indenter of the hardness tester contact the flat steel block vertically, and press by hand until the indenter plane of the hardness tester and the steel block plane fit tightly together, and the indication value of the hardness tester shall meet the requirements of Table 1. 6.A. Verification of the surface condition of the indenter and the geometrical dimensions of the indenter 6.4.4.1 The verification of the surface condition of the indenter and the geometrical dimensions of the indenter part shall be carried out on the tool microscope. During the calibration, fix the hardness tester on the special measuring workbench of the tool microscope, make the indenter in a horizontal position, observe the indenter in two mutually perpendicular directions, and the surface condition of the indenter shall meet the requirements of 1.1. Measure the diameter and top roundness of the indenter in two mutually subvertical directions, and each measured value shall meet the requirements of 4.5.2 and 4.5.3. Calculate the deviation value according to formula (3) and (4).
Where: △l--the maximum deviation of the indenter diameter, mm; △l--the measured value with the largest difference from t, mm; △l--the nominal value of the indenter diameter, mm.
JJG 1039-2008
Aa— α— αr:
The maximum deviation of the cone angle at the top of the indenter;
Where: Aa
α--the measured value with the largest difference from α;
α. The nominal value of the cone angle at the top of the indenter.
6.4.4.2 Verification of the radius of the ball at the top of the pressure needle (4)
Use a projector to magnify the projection of the spherical surface of the pressure needle pre-end by 100 times in the direction of two mutually perpendicular points, and inspect it by the concentric circle standard plate set line method. The outline of the spherical radius should be located between the curves of the two concentric semicircles R9.0 mm and R11.0 mm: At this time, the radius of the spherical surface at the top of the pressure needle is considered to meet the requirements of question 5. For other magnification factors, the cutouts of the two concentric semicircles are determined according to the actual calculated values. 6.4.5 Verification of the endurance of the pressure needle
After performing the operation twice in succession according to the requirements of 6.4.3.3, observe the pressure needle on the projector. The shape of the pressure needle does not produce any plastic deformation.
6.4.6 Verification of the geometry of the pressure foot
The geometric dimensions and inner hole of the pressure foot are carried out with a vernier caliper and a tool microscope. The results are in compliance with the requirements of 4.6. 6.4.7 Verification of test force
Fix the hardness tester on the hardness test stand or other special tools. Place the force measuring instrument under the hardness tester, with the needle of the hardness tester pointing downward and aligned with the force axis. Add a brass pad of about ±10mm×8mm to the test instrument, and a block with a geometric shape to prevent the top of the needle from being directly subjected to force. The surface of the pad is basically parallel to the pressing surface of the hardness tester.
Before verifying the test force, the hardness tester and the force measuring instrument should be pre-tested. During the verification process, the hardness tester, the pad and the force measuring instrument shall not be tilted.
Slowly raise the force measuring instrument and lower the hardness tester during the verification so that the test force of the hardness tester needle is applied to the force measuring instrument. When the pointer of the hardness tester indicates a certain point, read the value on the force measuring instrument. This value is the test force at that measuring point. The test force verification is performed by selecting 3 to 5 points evenly distributed within the range of the hardness tester (20 to 100 HL). Each point should be measured 3 times, and the result of any measurement should meet the requirements of 1.7. The deviation is calculated according to formula (5). AF = f-fa
Formula f: Af
Maximum deviation, mN;
Measured value with the largest difference, mN,
Nominal value of the measuring point, mN.
For other test force measuring instruments, the test force verification is performed according to the specific use method of the measuring instrument. 6.5 Processing of verification results
A verification certificate shall be issued to the hardness tester that meets the requirements of this regulation after verification. If it does not meet the requirements of this regulation, a verification result notice shall be issued.
6.6 Verification cycle
The verification cycle is generally not more than 1 year
Appendix A
Inspection unit
Model specification
Use metrological standard
Nature of verification: First verification
1. Appearance
, Verification of bed needle extension length
Verification items
JJG 1039—2008
Verification record of D-type Shore hardness tester
Verification room temperature
Factory number
Standard pusher certificate number
Subsequent verification
Manufacturer
Relative humidity
Verification technical basis:
Use the inspection port
Measurement result
Measured value/HD
When the maximum extension length of the pressure needle is within 2.46 mm
When the maximum extension length of the pressure needle is within 2.54 mm
III. Verification of measuring indicating device
Verification item
When the extension length of the pressure needle is the maximum
When the extension length of the pressure needle is 2.00 mm
When the extension length of the pressure needle is 1.25 mm
When the extension length of the pressure needle is 0 rt time
4. Inspection of the surface condition of the pressing needle
Inspection item date
Condition of the surface of the pressing needle
5. Inspection of the geometric size of the pressing needle
Inspection item
Pressing needle diameter
Round can angle
Front end spherical surface flat diameter
(1.25+0.15)mm
30°11°
Tolerance/HI)
20.0±1.0
50.0±1. 0
100.0±1.0
Measured value
Does it meet the requirements
Measurement result/HD)
Does the observed result meet the requirements
Measurement result/mm
Measurement value in 0% direction
Measurement value in 90° direction
(0. 1±0. 01)mm !
! Whether it meets the requirements
Whether it meets the requirements
Maximum difference
Maximum deviation
Whether it meets the requirements
VI. Test force verification
Verification point/HI)
Verifier
Nominal value/miN
Verifier
Difference/my
+-4-15
445
J.IG 1039—2008
Verification record number
Verification phase II
Measurement result/mN
Maximum difference
Verification certificate number
Verification cycle
Maximum deviation
Appendix B
Measuring standard used
Measuring standard instrument certificate number
Based technical documents
Verification environment conditions:
1. Appearance
2. Test of pressing needle extension length
Verification items
When the maximum extension length of the pressing needle is 2.46rnm
The maximum extension length of the pressing needle is 2.54 3. Verification of measuring finger arm
Verification items
When the protruding length of the pressing needle is at the maximum
When the protruding length of the pressing needle is 2.00mm
When the protruding length of the pressing needle is 1.25mm
When the protruding length of the pressing needle is 0mm
4. Surface condition of the pressing needle
Verification items
Surface condition of the pressing needle
5. Verification of geometric dimensions of the pressing needle
Verification items
Diameter of the pressing needle
Cone angle
Radius of the spherical surface at the top
Test force inspection
Verification point/HI)
JJG 1039—2008
Inner page format of calibration certificate
Calibration room temperature
Tolerance/HD
0. 0±0. 5
20.0±1.0
50. 0±1. 0
100.0±1.0
(1.25+0.15)mm
30°lj°
(0. 1+0.01)mm
Nominal value/mN
Tolerance/mV
Relative concentration
Measurement result
Whether it meets the requirements
Whether it meets the requirements
Deviation/HI)
Observation result
Whether it meets the requirements
Maximum deviation/titn
Whether it meets the requirements
Maximum deviation/mV
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