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Position: Chinese Standard in English/JJG 747-1999
JJG 747-1999   Verification Regulation of Equotip Hardness tester (English Version)
Standard No.: JJG 747-1999 Status:valid remind me the status change

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Language:English File Format:PDF
Word Count: 10000 words Price(USD):300.0 remind me the price change

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Implemented on:2000-4-1 Delivery: via email in 1 business day
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Standard No.: JJG 747-1999
English Name: Verification Regulation of Equotip Hardness tester
Chinese Name: 里氏硬度计检定规程
Chinese Classification: A53    Mechanics Measurement
Professional Classification: JJ    Metering
Issued by: CBTS
Issued on: 1999-12-22
Implemented on: 2000-4-1
Status: valid
Superseding:JJG 747-1991 Leeb Hardness Tester
Language: English
File Format: PDF
Word Count: 10000 words
Price(USD): 300.0
Delivery: via email in 1 business day
Verification regulation of Equotip hardness tester This regulation is applicable to the verification of newly manufactured, used and repaired metal Equotip hardness tester (hereinafter referred to as hardness tester). 1 General The hardness tester, made according to the elastic impact principle, is used to measure the hardness of metal materials. Composed of impact device and display device, a hardness tester has the following characterizes: digital display, small size and light weight. By holding its impact device, the operator can use it to directly carry out hardness test on the materials and workpieces to be tested, and it is especially applicable to hardness test of large workpieces which are difficult to move and large parts and components which are difficult to disassemble. Equotip hardness test is a dynamic hardness test. The impact device of a hardness tester releases the impact body (tungsten carbide or diamond ball head) from a fixed position, and impacts on the surface of the specimen. The impact velocity and rebound velocity of the ball head at a distance of 1mm from the surface of the specimen are measured. The Richter hardness value is expressed by the ratio of rebound velocity to impact velocity of the ball head. The following equation applies: (1) where, HL——the Richter hardness value, HL; vA——the impact velocity of ball head, m/s; vR——the rebound velocity of ball head, m/s. See Table 1 for the main model and technical parameters of the hardness tester.  
1 General 2 Technical requirements 2.1 Labeling 2.2 Impact device 2.3 Display device 2.4 Printer 2.5 Verification requirements 3 Verification conditions 3.1 Verification environment 3.2 Verification equipment 4 Verification items and methods 4.1 Appearance inspection according to 2.1 4.2 Verification of impact body 4.3 Test result 4.4 Consistency of hardness values 4.5 Verification of indication 4.6 Verification of newly manufactured hardness tester 4.7 Verification of hardness tester in use and after repair 5 Treatment of verification results and verification period 5.1 Treatment of verification results 5.2 Verification period Annex A Verification of standard Equotip hardness block Annex B Conversion value of Vickers hardness and Equotip hardness Annex C Conversion value of Brinell hardness and Equotip hardness (HLG)
JJG 747-1999 is referred in:
*GB/T 13313-2008 Methods of shore and leeb hardness testing for rolls
Code of China
Standard
JJG 747-1999   Verification Regulation of Equotip Hardness tester (English Version)
Standard No.JJG 747-1999
Statusvalid
LanguageEnglish
File FormatPDF
Word Count10000 words
Price(USD)300.0
Implemented on2000-4-1
Deliveryvia email in 1 business day
Detail of JJG 747-1999
Standard No.
JJG 747-1999
English Name
Verification Regulation of Equotip Hardness tester
Chinese Name
里氏硬度计检定规程
Chinese Classification
A53
Professional Classification
JJ
ICS Classification
Issued by
CBTS
Issued on
1999-12-22
Implemented on
2000-4-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
JJG 747-1991 Leeb Hardness Tester
Language
English
File Format
PDF
Word Count
10000 words
Price(USD)
300.0
Keywords
JJG 747-1999, JJG/T 747-1999, JJGT 747-1999, JJG747-1999, JJG 747, JJG747, JJG/T747-1999, JJG/T 747, JJG/T747, JJGT747-1999, JJGT 747, JJGT747
Introduction of JJG 747-1999
Verification regulation of Equotip hardness tester This regulation is applicable to the verification of newly manufactured, used and repaired metal Equotip hardness tester (hereinafter referred to as hardness tester). 1 General The hardness tester, made according to the elastic impact principle, is used to measure the hardness of metal materials. Composed of impact device and display device, a hardness tester has the following characterizes: digital display, small size and light weight. By holding its impact device, the operator can use it to directly carry out hardness test on the materials and workpieces to be tested, and it is especially applicable to hardness test of large workpieces which are difficult to move and large parts and components which are difficult to disassemble. Equotip hardness test is a dynamic hardness test. The impact device of a hardness tester releases the impact body (tungsten carbide or diamond ball head) from a fixed position, and impacts on the surface of the specimen. The impact velocity and rebound velocity of the ball head at a distance of 1mm from the surface of the specimen are measured. The Richter hardness value is expressed by the ratio of rebound velocity to impact velocity of the ball head. The following equation applies: (1) where, HL——the Richter hardness value, HL; vA——the impact velocity of ball head, m/s; vR——the rebound velocity of ball head, m/s. See Table 1 for the main model and technical parameters of the hardness tester.  
Contents of JJG 747-1999
1 General 2 Technical requirements 2.1 Labeling 2.2 Impact device 2.3 Display device 2.4 Printer 2.5 Verification requirements 3 Verification conditions 3.1 Verification environment 3.2 Verification equipment 4 Verification items and methods 4.1 Appearance inspection according to 2.1 4.2 Verification of impact body 4.3 Test result 4.4 Consistency of hardness values 4.5 Verification of indication 4.6 Verification of newly manufactured hardness tester 4.7 Verification of hardness tester in use and after repair 5 Treatment of verification results and verification period 5.1 Treatment of verification results 5.2 Verification period Annex A Verification of standard Equotip hardness block Annex B Conversion value of Vickers hardness and Equotip hardness Annex C Conversion value of Brinell hardness and Equotip hardness (HLG)
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