GB/T 42359-2023 PDF EnglishUS$230.00 · In stock · Download in 9 seconds
GB/T 42359-2023: Laboratory buffing method for wet, ice and snow testing of passenger car tyres Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 42359-2023: Laboratory buffing method for wet, ice and snow testing of passenger car tyres---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT42359-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.10 CCS G 41 Laboratory buffing method for wet, ice and snow testing of passenger car tyres ISSUED ON: MARCH 17, 2023 IMPLEMENTED ON: OCTOBER 1, 2023 Issued by: State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Equipment and instruments ... 5 5 Preparation before grinding ... 6 6 Grinding conditions ... 8 7 Grinding procedures ... 8 8 Judgment rules of grinding inspection ... 9 9 Tyre grinding test report ... 11 Appendix A (Informative) Pattern depth gauge ... 12 Laboratory buffing method for wet, ice and snow testing of passenger car tyres1 ScopeThis document describes the laboratory buffing method for passenger car tyres used for relative grip performance testing on wet, ice and snow roads, including test equipment and instruments, preparations before grinding, grinding conditions, grinding procedures, judgment rules of grinding inspection, and grinding test report. This document applies to the laboratory buffing of new passenger car pneumatic tyres for testing.2 Normative referencesThe following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document. GB/T 2978 Size designation, dimensions, inflation pressure and load capacity for passenger car tyres GB/T 3487 Rims for passenger car GB/T 6326 Tyre terms and definitions GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values3 Terms and definitionsThe terms and definitions defined in GB/T 6326 and the followings apply to this document. 3.1 groove depth The vertical distance from the lowest point of the groove bottom to the tangent of the tread. 3.2 target groove depth The groove depth that is expected to be formed after a tyre is ground. 3.3 groove depth after buffing The groove depth that is actually formed after a tyre is ground.4 Equipment and instruments4.1 Tyre grinding equipment Tyre grinding equipment shall include: a) A spindle device, which is used to install tyres; b) A driving device, which is used to drive tyres to rotate; c) An inflation and pressure regulating device, which is used to quickly inflate and deflate tyres and control the stability of the air pressure when the tyres are running; d) A grinding device, which is used to grind tyres. 4.2 Inflation pressure gauge or air pressure sensor A hand-held inflation pressure gauge or an air pressure sensor installed on the special grinding equipment for tyres, and the accuracy shall be ±5 kPa. 4.3 Rim 4.3.1 The width of the rim shall comply with the measuring rim width stipulated in GB/T 2978 or related industry technical documents. NOTE: The relevant industry technical documents are only applicable to the specifications of passenger car tyres that are not within the scope of GB/T 2978. 4.3.2 The specified diameter and the inner contour of the rim shall comply with the provisions of GB/T 3487. In order to facilitate loading and unloading and to ensure that the bead of the tyre is in place correctly, other requirements for the rim are as follows: a) The fillet radius of the bead seat of the rim is less than 2.5 mm; b) The rim flange height is not less than 9.6 mm, but not higher than the flange height of the measuring rim; c) The bead seat of the tyre may not have peaks. 4.3.3 The difference between the diameters of the two bead seats of the rim shall be less than 0.1 mm. 4.3.4 When the rim is installed on the equipment, the maximum radial circle runout tolerance (the bead seat part) and the maximum transverse circle runout tolerance (the inner surface of the rim) at the bead seat of the rim shall be less than 0.25 mm. 4.3.5 The rim shall be rigid enough to ensure that the deflection in any direction of the bead seat shall be less than 0.13 mm when running under the working air pressure (inflation pressure during tyre size measurement and grinding). 4.4 Pattern depth measuring instrument The measurement accuracy of the pattern depth measuring instrument shall be ±0.02 mm. It is advisable to use a pattern depth gauge, see Appendix A. 4.5 Surface roughness measuring instrument The accuracy of the surface roughness measuring instrument shall be ±0.05 μm.5 Preparation before grinding5.1 The tyre shall be parked for at least 24 hours after vulcanization. 5.2 The tyre shall be parked at an operating ambient temperature of 5 °C~40 °C for at least 3 hours before grinding. 5.3 The tyre shall be installed on the rim specified in 4.3. Lubricant can be used when installing the tyre. 5.4 Inflate the tyre with the working air pressure; for snow and ice tyres, the working air pressure shall be 240 kPa±5 kPa, and for other tyres, it shall be 220 kPa±5 kPa; observe whether the tyre and rim slip through trial grinding. 5.5 Mark the groove depth measuring points on the tyre. The mark shall be at a position where the groove is obvious and easy to measure, and try to avoid the position that affects the measurement of the groove depth (such as the position of the tread wear indicator). The measuring point position shall be marked according to the following requirements. a) Tyre circumferential markings. The tyre circumferential marks are distributed at 5 points at approximately equal intervals, as shown in Figure 1. b) Tyre transverse markings. For tyres with significant longitudinal groove patterns, mark n+4 marking points in the transverse direction of the tyre (n is the number of longitudinal grooves). Among them, there is one mark point in in 5.5 one by one, and record the groove depth.6 Grinding conditions6.1 The working environment temperature for tyre grinding shall be 5 °C~40 °C. 6.2 During the grinding process, it shall be ensured that the tyre always maintains the working air pressure specified in 5.4. 6.3 During the grinding process, the surface temperature of the tyre (including the temperature in the groove) shall be monitored, and the tyre surface temperature should not exceed 110 °C during grinding.7 Grinding procedures7.1 The preparation and inspection shall be carried out according to the regulations in Chapter 5 and Chapter 6. 7.2 During the grinding process, the groove depth of each marking point shall be measured. When measuring, the surface of the tyre in and around the marking point groove shall be cleaned to remove the adhered rubber powder and reduce the measurement error. 7.3 Adjust the grinding device so that the groove depth of each marked point reaches the target groove depth specified in Table 1, and on both sides, the contour of the tyre shoulder after grinding shall be a curve that naturally transitions from the outermost main groove to the shoulder. 7.4 Use the groove depth measuring instrument to measure the marked points one by one and record the groove depth. 7.5 Use the surface roughness measuring instrument, it shall find the suitable position NEAR the 3 transverse measuring positions that are approximately equidistant on the grinding surface AND the 5 circumferential marking points as shown in Figure 2 [Translator’s note: should be Figure 1], and take samples along the circumferential direction with a sampling length of about 2.5 mm, then, measure and record the tyre surface roughness. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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