QC/T 1153-2021 PDF EnglishUS$195.00 · In stock · Download in 9 seconds
QC/T 1153-2021: Bolt tension test procedure for automotive threaded joints - Ultrasonic piezoelectric ceramics method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
QC/T 1153-2021: Bolt tension test procedure for automotive threaded joints - Ultrasonic piezoelectric ceramics method---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/QCT1153-2021 AUTOMOBILE INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040 CCS T 30 Bolt tension test procedure for automotive threaded joints - Ultrasonic piezoelectric ceramics method ISSUED ON: AUGUST 21, 2021 IMPLEMENTED ON: FEBRUARY 01, 2022 Issued by: Ministry of Industry and Information Technology of PRC Table of ContentsForeword ... 5 1 Scope ... 6 2 Normative references ... 6 3 Terms and definitions... 6 4 Test preparation ... 7 5 Test method ... 10 6 Data processing ... 11 7 Test report ... 12 Bolt tension test procedure for automotive threaded joints - Ultrasonic piezoelectric ceramics method1 ScopeThis document specifies the requirements for test preparation, test methods, data processing, test reports, for the ultrasonic piezoelectric ceramics method of bolt tension test procedure for automotive threaded joints. This document applies to M6 ~ M27 bolts.2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date applies to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 16823.2-1997 General rules of tightening for threaded fasteners GB/T 16823.3-2010 Fasteners - Torque/clamp force testing3 Terms and definitionsThe terms and definitions, which are defined in GB/T 16823.2-1997, as well as the following terms and definitions, apply to this document. 3.1 Bolted joint An assembly, which is composed of threaded fasteners and connected parts. [Source: GB/T 16823.2-1997, 3.1] 3.2 Yield clamping force The axial force, at which the bolt reaches yield, when tightened. [Source: GB/T 16823.2-1997, 3.1] 3.3 Yield tightening torque The torque, at which the yield clamping force is reached, when tightening. [Source: GB/T 16823.2-1997, 3.1] 3.4 Ultimate clamping force Maximum axial force, during tightening to bolt breakage. [Source: GB/T 16823.2-1997, 3.1]4 Test preparation4.1 Requirements of test devices 4.1.1 Torque angle sensor The allowable error of torque measurement shall be ±2%; the allowable error of angle measurement shall be ±1°. 4.1.2 Axial force sensor The allowable error of the axial force sensor measurement shall be ±1%. 4.1.3 Ultrasonic measuring device The data collection frequency shall not be lower than 1000 Hz; the signal is sensitive; the display resolution can distinguish the echo time difference of 0.l ns. The measuring device shall contain a temperature compensation interface. 4.1.4 Piezoelectric ceramic sheet The natural frequency of the piezoelectric ceramic sheet shall be between 2 MHz ~ 10 MHz. 4.1.5 Calibration pad The calibration pad is used to adjust the clamping length during calibration; its rigidity shall comply with the provisions of 6.2 in GB/T 16823.3-2010. 4.2 Test samples 5.1.6 If there are no special requirements, the tightening tool shall be set, according to the actual assembly parameters. The torque-axial force-angle curve shall be recorded, after tightening. 5.1.7 It shall repeat the steps 5.1.1 to 5.1.6, to complete the test of all samples. 5.2 Residual axial force test of bolt 5.2.1 The number and state of the test samples shall be checked. If the temperature changes, after the connection point is verified, by dynamic load, THEN, it shall be allowed to stand for a long enough time, to ensure that it returns to the ambient temperature. 5.2.2 An ultrasonic test device shall be set up, to test the residual axial force of the bolt AND compensate for the temperature difference, between the bolt test and the environment when the echo is zero. 5.2.3 If the bolt is tightened, in the elastic region, by the torque method, it shall directly test the time difference of the current bolt echo; compare with the calibration curve when the bolt is tightened, to directly read the residual axial force. 5.2.4 If the bolt is tightened to the yield area, by the torque-angle method, the bolt shall be loosened, based on the current ultrasonic propagation time of the bolt, as the zero reference, to test the ultrasonic propagation time difference of the bolt, after loosening; take the absolute value. Then calibrate the bolt on the axial force sensor, to generate the calibration curve of the yielded bolt. Directly compare the residual axial force of the bolt, on the calibration curve, through the absolute value of the time difference.6 Data processing6.1 Test curve processing: For the convenience of data analysis, the torque-axial force- angle curve, which is recorded after the test, can be combined on one graph, AND aligned to the target torque or the torque at the starting point of the rotation angle, as shown in Figure 4. 6.2 The statistics of test data can be processed, according to the format of Table 2. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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