GB/T 2490-2018 English PDFUS$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 2490-2018: Bonded abrasive products -- Hardness grade measurement Status: Valid GB/T 2490: Historical versions
Basic dataStandard ID: GB/T 2490-2018 (GB/T2490-2018)Description (Translated English): Bonded abrasive products -- Hardness grade measurement Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J43 Classification of International Standard: 25.100.70 Word Count Estimation: 10,153 Date of Issue: 2018-07-13 Date of Implementation: 2019-02-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 2490-2018: Bonded abrasive products -- Hardness grade measurement---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Bonded abrasive products--Hardness grade measurement ICS 25.100.70 J43 National Standards of People's Republic of China Replace GB/T 2490-2007 Bonded abrasive hardness test Published on.2018-07-13 Implementation of.2019-02-01 State Market Supervisory Administration China National Standardization Administration issued ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 2490-2007 "hardened abrasive hardness test", compared with GB/T 2490-2007 main technical changes as follows. --- Added normative references (see Chapter 2); ---Modified the expression of nozzle to abrasive surface distance, pressure gauge accuracy grade and quartz sand chamber volume (see 3.1.1.5~) 3.1.1.7,.2007 version 2.1.1.5~2.1.1.7); --- Revised the expression of the test sieve requirements in the quartz sand particle size (see 3.1.2.3,.2007 version 2.1.2.3); --- Revised the name and thickness requirements of the calibration glass (see 3.1.3,.2007. 2.1.3.1); --- Increased the requirements for the triangular end face of the blasting hardness machine support head and the surface seal of the abrasive tool in working conditions (see 3.2.3); --- Revised the order of the correction clause for the sandblasting hardness machine (see 3.2.4,.2007 version 2.1.3.2); --- Increased the specification of the blasting hardness abrasive tool, the grinding wheel (35, 36, 37 type) inspection work surface regulations, the diameter of the abrasive tool is greater than When the specification of the measurement site is 1000mm and the thickness of the abrasive tool is greater than 400mm, the specification of the same production process can be made (see Table 1, Table 1 of the.2007 edition); --- Revised the relevant requirements in the blasting hardness test operation (see 3.3.2,.2007 version 2.3.2); --- Added a description of the special requirements for sandblasting hardness (see 3.4.4); --- Increased the requirements for Rockwell hardness testers (see 4.1); --- Revised the name of the load in Rockwell hardness working conditions (see Table 3, Table 3 of the.2007 edition); --- Increased the time for the application of test force (see Table 3, Table 3 of the.2007 edition); --- Increased the requirements for the same block of production process in the Rockwell hardness measurement site (see 4.3.1.5); --- Revised the relevant requirements in the Rockwell hardness test operation (see 4.3.2,.2007 version 3.2.2); --- Added a description of the special requirements for Rockwell hardness (see 4.4.4). This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Abrasives Standardization Technical Committee (SAC/TC139). This standard was drafted. Zhengzhou Abrasives Grinding Research Institute Co., Ltd., Chengdu Grinding Wheel Co., Ltd., Jiangxi Guanyi Grinding Co., Ltd. Company, Yangzhou Dongfang Grinding Wheel Co., Ltd., Liaoning Chengrui Grinding Wheel Co., Ltd., Nanchang Jingli Industrial Co., Ltd. The main drafters of this standard. Lu Shenfeng, Zhang Kexuan, Liu Jiayuan, Yi Chenhao, Chang Shuming, Chi Kewu, He Yan, Shi Jimin. The previous versions of the standards replaced by this standard are. ---GB/T 2490-1981, GB/T 2490-1984, GB/T 2490-2003, GB/T 2490-2007; ---GB/T 2491-1981, GB/T 2491-1984, GB/T 2491-2003. Bonded abrasive hardness test1 ScopeThis standard specifies the method for testing the hardness of abrasive tools by sandblasting hardness machine and the method for testing the hardness of abrasive tools by Rockwell hardness tester. This standard applies to ceramic binders and resin binder bonded abrasives with abrasive grain size F36~F1200.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 230.2 Rockwell hardness test for metallic materials - Part 2. Hardness testers (A, B, C, D, E, F, G, H, K, N, T scales) Inspection and calibration3 Sandblasting hardness machine to test the hardness of abrasive tools3.1 Technical requirements for sand blasting hardness machine, quartz sand and calibration glass 3.1.1 Sand blasting hardness machine 3.1.1.1 The nozzle aperture shall be 5.5mm~6.0mm; there shall be no obvious steps at the joint of the inner wall. 3.1.1.2 The cone bottom diameter of the cone nozzle shall be 5.5mm~6.0mm. 3.1.1.3 The mouth diameter of the interface should be 4.5mm~5.0mm. 3.1.1.4 The outer diameter of the measuring rod shall be 4.2 mm ± 0.1 mm. 3.1.1.5 The distance from the nozzle to the surface of the abrasive tool shall be 9.0 mm ± 1.0 mm. 3.1.1.6 The pressure gauge accuracy level shall not be less than 1.6. 3.1.1.7 Quartz sand chamber. 5cm3 The volume of the sand chamber should be 5.0cm3±0.5cm3; the volume of the 28cm3 sand chamber should be 28.0cm3± 1.0cm3. 3.1.2 Quartz sand 3.1.2.1 Chemical composition. SiO2 ≥ 95%; burning loss ≤ 0.30%; impurity ≤ 3%. 3.1.2.2 Density. 2.64g/cm3 ± 0.02g/cm3. 3.1.2.3 Particle size. sieve hole size 0.85mm (wire diameter 0.5mm) sieve sieve balance of not more than 3% (mass fraction); sieve hole The sieve undersize of the test sieve of size 0.5 mm (wire diameter 0.315 mm) is not more than 8% (mass fraction). 3.1.3 Calibration glass A soda-lime-silica flat glass having a thickness of not less than 5 mm. 3.2 Working conditions 3.2.1 Sand blasting hardness The air pressure of the air chamber is 0.15 MPa. 3.2.2 Abrasives with hardness class F~L are measured with 5cm3 sand chamber; tools with hardness class M~Y are used for 28cm3 sand chamber ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 2490-2018_English be delivered?Answer: Upon your order, we will start to translate GB/T 2490-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 2490-2018?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 2490-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
