HG 2368-1992 Specifications for Shore A-type rubber pocket hardness tester
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG 2368-92
Shore A-type rubber pocket hardness tester
Technical conditions
Published on September 15, 1992
Ministry of Chemical Industry of the People's Republic of China
Implementation on July 1, 1993
Chemical Industry Standard of the People's Republic of China
Shore A-type rubber pocket hardness tester
Technical conditions
Subject content and scope of application
HG2368-92
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage requirements of Shore A-type rubber pocket hardness tester (hereinafter referred to as hardness tester). This standard is applicable to hardness testers for measuring the hardness of vulcanized rubber, plastics and thermoplastic elastomers. 2 Reference standards
HG/T2382 General technical conditions for rubber testing instruments and equipment 3 Structural dimensions
3.1 The main structure has a pressure needle. Pressure foot, spring and display mechanism, 3.2 Medical needle, pressure foot structure and main dimensions, see the following diagrams respectively, 3.3 The spring elasticity, shape and size of the hardness tester of the same model must be consistent, 3.4 The hardness tester can be equipped with a fixed load frame, which should comply with the provisions of Appendix A (Supplement), Pressure needle, pressure foot structure diagram
Needle, pressure foot main dimensions table
Pressure foot outer diameter
Medical foot inner diameter
Jade needle end plane diameter
.0.79±0.02
People's Republic of China Chemical Approved by the Ministry of Education and Industry on September 15, 1992. Diameter of the pressing needle
1.25±0.15
Length of the jade needle
2.5±0.025
Conical angle of the pressing needle end
Implemented on July 1, 1993
4 Technical requirements
4.1 Normal working conditions
a. Ambient temperature: 5~40℃;
b Relative humidity: less than 85%;
No corrosive medium around;
No movement in the surrounding environment.
4.2 Pressing needle
IIG2368-92
4.2.1. The pressing needle is made of wear-resistant and rust-proof material. After heat treatment, the hardness should reach 599~713HV.4.2.2 The shape and size of the jade needle should comply with the provisions of Article 3.2. 4.2.3 The surface roughness of the pressing needle is Ra≤0.8um. 4.2.4 The verticality of the center line of the pressing needle to the plane of the bottom of the pressing foot is not greater than 0.02mm4.3 Pressing foot
4.3.1 The bottom surface of the pressing foot should be flat and smooth, and its roughness is Ra≤0.8um. 4.3.2 The inner and outer diameters of the pressing foot should comply with the provisions of Article 3.2. 4.4 Spring force
4.4.1 The relationship between the force applied by the spring to the indenter of the hardness tester and the indication of the hardness tester is expressed by the following formula: F=550+75HA
Wherein: F-
The force applied by the spring to the indenter of the hardness tester, mN; - the initial force applied by the spring to the indenter when the indication of the hardness tester is zero, mN; 75-the force of the spring on the indenter corresponding to each degree of the hardness tester, mN; H-the indication of the hardness tester, www.bzxz.net
The allowable deviation between the force applied by the spring to the indenter of the hardness tester and the calculated value is ±75mN. 4.4.2 After 30,000 fatigue tests, the spring should not show permanent deformation. 4.5 Display mechanism
4.5.1 Hardness display range: 0~100 degrees, the allowable deviation of the indication value within the range of 20~90 degrees is ±1 degree 4.5.2 The scale markings of the dial indicator device should be clear, the divisions should be uniform and consistent, the width of the pointer tip should not exceed the width of the scale line, the pointer should be straight, move sensitively, hook fast, and the surface should be transparent and clean. 4.5.3 The digital indication device should display stable and reliable numbers with a resolution of 0.2 degrees. When the hardness tester is in a free state, its indication value is zero.
4.6 Appearance
The appearance quality of the hardness tester should comply with the provisions of HG/T. The hardness tester's resistance to transportation bumps
The hardness tester should be able to withstand the transportation bump test without damage under packaging conditions. After the test, the hardness tester should fully comply with the requirements of this standard without adjustment.
5 Test method
5.1. Test conditions
The test shall be carried out under the conditions specified in Article 4.1 of this standard. 3.2 Test tools, measuring tools and instruments
a. Dial indicator: range is 0~10mm, zero level; b. Magnetic table base;
HG.2368--92
Caliper: range is 0~150mm, resolution is 0.02mm; Special elastic fatigue testing machine: rotation frequency is 23±10Hz; Tool microscope: magnification is 30 times, graduation value is 0.01 mm (or other instruments with the same precision); surface roughness ratio sample block;
disk block: grade:
force sensor: measuring range is 0~10N, uncertainty is 0.5%FS; Vickers hardness tester
5.3 Indenter detection
5.3.1 Detection of the plane diameter of the indenter end
Fix the indenter of the hardness tester vertically upward with a clamp and place it on the workbench of the tool microscope. Detect its diameter in two perpendicular directions of the radial direction. Measure twice in each direction and take the average value. Each average value should comply with the provisions of Article 4.2.2. 5.3.2 Detection of the cone angle of the indenter end
Place the hardness tester flat on the workbench of the tool microscope, keep the indenter horizontal, and detect its circular chain angle in two perpendicular directions of the axial direction of the jade needle. Measure twice in each direction and take the average value. Each average value should comply with the provisions of Article 4.2.2. 5.3.3 Detection of the protruding length of the pressure needle
a. Install the hardness tester vertically on the fixed load frame, place a standard block on the workbench of the fixed load frame, and slowly adjust the lifting device of the fixed load frame so that the pressure needle just contacts the gauge block. b. Fix the dial indicator on the magnetic base, the dial indicator probe contacts the standard gauge block vertically, and then adjust the dial indicator to zero. c. Adjust the lifting mechanism of the fixed load frame to make the workbench rise slowly, so that the plane of the bottom of the pressure foot and the plane of the end of the pressure needle are completely consistent with the gauge block. At this time, the value on the dial indicator is the protruding length of the pressure needle. Continuously test three times and take the average value. The average value should comply with the provisions of Article 4.2.2.
The protruding length of the pressure needle can also be detected by other corresponding test devices. 5.3.4 Detection of the diameter of the indenter
Take the indenter in two directions perpendicular to the radial direction, use a caliper to detect the diameter of the indenter, detect twice in each direction, and take the average value. Each average value should comply with the provisions of Article 4.2.2.
5.3.5 Detection of the hardness of the indenter
Use a Vickers hardness tester to detect the hardness of the indenter. After the jade needle is heat treated, 3% of each batch is sampled, and each piece is tested three times. Take the average value. Each average value should comply with the provisions of Article 4.2.1.
5.3.6 Detection of the verticality of the center line of the indenter to the plane of the sole of the indenter Place the hardness tester horizontally on the workbench of the tool microscope, and measure the verticality of the plane of the sole of the indenter with the center line of the indenter as the reference. The test result should comply with the provisions of Article 4.2.4.
5.3.7 Detection of the roughness of the indenter
Compare with the surface roughness comparison sample block, and the test result should comply with the provisions of Article 4.2.3. 5.4 Pressure foot detection
5.4.1 The inner and outer diameters of the pressure foot are detected with a caliper, and the detection results shall comply with the provisions of Article 4.3.2. 5.4.2 The surface roughness of the pressure foot is detected by comparing with the surface roughness comparison sample block, and the detection results shall comply with the provisions of Article 4.3.1. 5.5 Elasticity detection
5.5.1 Detection of elasticity force value
Fix the hardness tester vertically on the fixed load frame; a.
b. Place the force sensor and the dial indicator with a magnetic base vertically on the plane of the fixed load frame workbench: Slowly adjust the lifting device on the fixed load frame so that the hardness tester pressure needle contacts the sensor and is subjected to an initial elastic force of 550mN e.
, and the force value is displayed on the sensor display. At this time: the hardness tester indication should be zero; d. Adjust the percentage value to zero;
HG2368-92
Adjust the lifting mechanism on the fixed load frame to make the workbench rise slowly. The calibration points can be set as 0, 20, 40, 60, 80, and 100 degrees (the calibration points can also be determined according to the usage). Test the calibration points, test each point three times, and take the average value. Each average value should comply with the provisions of Articles 4.4.1 and 4.5.1. 5.5.2 The force value of the spring can also be tested by other corresponding force measuring devices. 5.5.3 Spring fatigue test
Install the spring can on the spring fatigue testing machine, and compress the spring repeatedly at a frequency of 23±10Hz and a stroke of not less than 2.4mm. After the spring fatigue test, it should comply with the provisions of Article 4.4.2 after testing. 5.6 Inspection of indicating device
The scale of dial indicating device shall be inspected with a tool microscope, and other parts and digital indicating device shall be inspected visually. The inspection results shall comply with the provisions of 4.5.2 and 4.5.3. 5.7 The transportation bump test and the inspection of the appearance quality plate of the hardness tester shall be carried out in accordance with the relevant provisions of HG/T. 6 Inspection rules
Each hardness tester shall be inspected and qualified by the quality inspection department and accompanied by a certificate of conformity before it can leave the factory. The measured data of the main inspection items shall be recorded in the random documents.
6.1 Inspection classification
The inspection of hardness testers is divided into factory inspection and type inspection. Factory inspection: inspect each unit according to 4.2~4.4.1, 4.5, 4.6; type inspection: sample inspection according to 4.2~4.7. 6.2 The hardness tester shall be type inspected under the relevant circumstances specified in HG/T. 6.3 The sampling and judgment rules of type inspection shall be implemented in accordance with the relevant provisions of HG/T. 7 Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of hardness testers shall comply with the relevant provisions of HG/T. 8 Random Documents
The types and storage of random documents of the hardness tester shall comply with the provisions of HG/T. HG2368-92
Appendix A
Fixed Load
(Supplement)
A1 The fixed load frame must have a guide device to make the hardness tester pressure needle and the working base table move relative to each other. When the pressure foot is engaged with the working base table, the maximum clearance should be less than 0.05mm. A2 A heavy hammer with a mass of 1kg (including the mass of the connecting part) is installed on the upper end of the connection between the hardness tester and the fixed load frame. A3 A lifting device is installed at the appropriate position of the fixed load frame, which can flexibly adjust the working base table to move up and down or move the hardness tester up and down. After the hardness tester is fixed on the fixed load frame, the hardness tester pressure needle must be perpendicular to the center of the working base table and equipped with a fine-tuning device. There should be no left and right swing. A4
Additional Notes:
This standard was proposed by China National Chemical Equipment Corporation and is under the jurisdiction of the Rubber Testing Instruments and Equipment Standardization Technical Committee of the Ministry of Chemical Industry. This standard was drafted by Yingkou Material Testing Machine Factory. The main drafters of this standard are Xia Deyin and Chen Xiaojie. People's Republic of China
Chemical Industry Standard
Shale A-type Rubber Pocket Hardness Tester
Technical Conditions
HG2368-92
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100013
Printer Standardization Research Institute of Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format 880×12301/16°Printing Increase/sNumber of Words 10000First Edition in July 1993
First Printing in July 1993
Print Quantity 1-500
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