GB/T 28703-2012 English PDF

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GB/T 28703-2012: Test methods for parallel screw threads
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 28703-2012	1319	Add to Cart	8 days	Test methods for parallel screw threads	Valid

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Basic data

Standard ID: GB/T 28703-2012 (GB/T28703-2012)
Description (Translated English): Test methods for parallel screw threads
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 21.040.01
Word Count Estimation: 60,680
Quoted Standard: GB/T 3934; GB/T 8124; GB/T 10922; GB/T 14791; JB/T 10865; JJF 1001; JJF 1059
Regulation (derived from): National Standards Bulletin No. 24 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the prop thread parameters (pitch, lead, flank angle, large diameter, the diameter, trails, the diameter prop roundness, the diameter cylindrical taper bottom back teeth arc radius, diameter relative to the diameter of beating the

GB/T 28703-2012: Test methods for parallel screw threads

---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.
ICS21.040.01 J04 National Standards of People's Republic of China Threaded barrel detection method Issued on. 2013-03-01 2012-09-03 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions, code 1 1 4 test conditions 4.1 Standard reference conditions 1 4.2 Temperature Measurement Condition 1 4.3 testing apparatus condition 2 5 Detection 3 Thread 4 6 single parameter measurement 6.1 external thread single parameter measurement 4 6.1.1 Diameter 4 6.1.1.1 Overview 4 6.1.1.2 the amount of ball method 5 6.1.1.3 Three - point Method 9 6.1.1.4 axis cutting method 13 6.1.1.5 outside micrometer Act 16 6.1.1.6 thread micrometer Act 18 6.1.2 flank angle 18 6.1.2.1 Overview 18 6.1.2.2 Image to 18 6.1.2.3 Diffraction Interferometry 20 6.1.3 pitch (lead) 20 6.1.3.1 Overview 20 6.1.3.2 length measuring instrument method 20 6.1.3.3 Image to 23 6.1.4 large diameter 23 6.1.5 Trail 23 6.1.6 roundness and taper diameter cylinder 23 6.1.7 large diameter relative to the diameter of beating 23 6.1.8 tooth bottom radius of curvature 24 6.2 internal thread single parameter measurement 24 6.2.1 diameter 24 6.2.1.1 Overview 24 6.2.1.2 the amount of 24-ball method 6.2.2 flank angle 26 6.2.3 pitch (lead) 26 6.2.4 diameter cylindrical roundness and taper 26 6.2.5 Trail 27 6.2.6 trails in diameter relative beating 27 6.3 measurement result report 27 7 27 Thread Inspection 8 qualified determination 28 Appendix A (informative) threaded multi-parameter measurement 29 Annex B (informative) indicates thread gauge 30 The amount of Annex C (informative) for measuring the diameter of the pin (ball) diameter Select 31 Annex D (informative) load three-pin diameter measuring method selection 47 Appendix E (normative) Measurement Uncertainty Evaluation of Example 48 References 55

Foreword

This standard rule according to GB/T 1.1-2009 given draft. This standard by the National Standardization Technical Committee thread (SAC/TC108) and focal points. Please note that some of the content of this document may involve patent issuing authority of this document does not assume responsibility for the identification of these patents. This standard is drafted by. Shanghai Institute of Measurement and Testing. Participated in the drafting of this standard. Shanghai fasteners and welding materials Institute of Technology, Productivity Promotion Center in the machine. The main drafters of this standard. Tsai Ming steel, Jian Wang, Xue Junyi, Li Xiaobin, Zhu Yiqing, Liu Yuan mold, Wang Ying, Tang Yingnuo, Mao Zhenhua, Wang Wei, Yu Guiying. Threaded barrel detection method

1 Scope

This standard specifies the threaded barrel parameters (pitch, lead, flank angle, large-diameter, diameter, small diameter, the diameter of the cylindrical roundness, taper diameter cylinder, Tooth bottom radius of the arc, the top diameter relative diameter beat) detection method. This standard applies to detect the cylinder thread parameters.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated edition applies to this article Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 3934 technical conditions common thread gauge GB/T 8124 trapezoidal thread gauge technical conditions GB/T 10922 55 ° non-sealing pipe thread gauge GB/T 14791 term thread JB/T10865 unified thread gauge JJF1001 common measurement terms and definitions JJF1059 Evaluation and Expression of Uncertainty in Measurement 3 Terms and definitions, code GB/T 14791, JJF1001 and JJF1059 defined and the following terms and definitions, code applicable to this document. 3.1 Thread detection testonscrewthreads To determine whether products conform to thread a corresponding set of operations required standards. Note. These operations typically include measuring the magnitude of the thread parameters and (or) exceeds allowable limit test.

4 test conditions

4.1 Standard reference conditions Standard reference temperature. t0 = 20 ℃; Standard Reference load. F0 = 0. 4.2 Measurement temperature conditions Ambient temperature and the temperature difference between the DUT and measuring instruments shall comply with the requirements of Table 1. ......

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