GB/T 18685-2017 English PDF

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GB/T 18685-2017: The blank diameters for rolling general purpose metric screw threads
Status: Valid

GB/T 18685: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 18685-2017	179	Add to Cart	3 days	The blank diameters for rolling general purpose metric screw threads	Valid
GB/T 18685-2002	85	Add to Cart	Auto, < 3 mins	The bar diameters for rolling general purpose metric screw threads	Obsolete

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GB/T 19348.1   GB/T 18851.1   GB/T 18851.2   GB/T 30565   GB/T 19799.3   

Basic data

Standard ID: GB/T 18685-2017 (GB/T18685-2017)
Description (Translated English): The blank diameters for rolling general purpose metric screw threads
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 21.040.01
Word Count Estimation: 9,992
Date of Issue: 2017-09-29
Date of Implementation: 2018-04-01
Older Standard (superseded by this standard): GB/T 18685-2002
Regulation (derived from): National Standard Announcement 2017 No. 23
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

GB/T 18685-2017: The blank diameters for rolling general purpose metric 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.
The blank diameters for rolling general purpose metric screw threads ICS 21.040.01 J04 National Standards of People's Republic of China Replacing GB/T 18685-2002 Ordinary thread rubbing and roughing rough diameter 2017-09-29 Posted 2018-04-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 18685-2002 "rub, roll rough diameter before the ordinary thread." Compared with GB/T 18685-2002, In addition to editorial changes, the main technical changes are as follows. --- This standard adds 22 threads specifications (M8 × 0.75, M10 × 0.75, M18 × 1, M20 × 1, M22 × 1, M24 × 1, M27 × 1, M30 × 1, M39 × 4, M42 × 4, M45 × 4, M45 × 3, M45 × 2, M45 × 1.5, M48 × 4, M48 × 3, M48 × 2, M48 × 1.5, M52 × 4, M52 × 3, M52 × 2, M52 × 1.5) (see Table 1); --- Turning process using rough, the standard with "surface roughness profile arithmetic average deviation of the value of 2 times (2Ra)" amendment Mao Blank diameter;.2002 edition of the standard "surface roughness profile maximum height value (Rz)" to amend the blank diameter (see 7.1,.2002 edition Chapter 7, paragraph 1); --- The standard recommended rough diameter and thread diameter tolerance ratio of not less than 0.20, do not meet the conditions of 11 specifications of the 4 The maximum diameter of the thread blank has been adjusted (the calculation does not take into account the diameter of the ring end of the thread shrinkage factor fT) (M18 × 2.5, M20 × 2.5, M22 × 2.5, M30 × 3.5, M33 × 3.5, M36 × 4, M39 × 4, M42 × 4, M45 × 4, M48 × 4, M52 × 4);.2002 version of the standard diameter of the rough conditions given is not less than 0.01mm, it does not adjust the rough Maximum diameter (see Chapter 7 and Tables A.2 and A.22, Table 1); --- This standard to determine thread through ring thread length (B) method and the.2002 version of the standard (see A.1,.2002 version A.1). This standard by the National Standardization Technical Committee threaded (SAC/TC108) and focal point. This standard was drafted unit. Shaoxing Mountain High Pressure Fasteners Co., Ltd., machine Productivity Promotion Center, CATIC First Aircraft Research Institute, China Aeronautical Integrated Technology Institute. The main drafters of this standard. Song Weidong, Li Xiaobin, Zhao Huiting, Xu Ling, Lingyun Xia. This standard superseded standard previous versions of the situation. --- GB/T 18685-2002. Ordinary thread rubbing and roughing rough diameter

1 Scope

This standard specifies the general thread rubbing and rolling before the blank diameter size. Common thread nominal diameter range of 1mm ~ 52mm (First and second series of diameter; maximum pitch 4mm); thread tolerance with 4h, 6h, 6g, 6f and 6e five. This standard applies to the all-dental extrusion process of carbon steel and alloy steel ordinary thread. Note. "Tooth-type extrusion process" refers to the thread extrusion process, the thread material is fully filled with the cutter tooth bottom space processing methods.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 971-2008 thread rolling wheel GB/T 972-2008 Roll plate GB/T 3934-2003 General thread gauge technical conditions GB/T 14791 thread terminology

3 Terms and definitions

GB/T 14791 defined terms and definitions apply to this document.

4 blank diameter formula

The formulas for calculating the diameter of rubbing and rolling thread blanks shall comply with the provisions of Appendix A.

5 rough diameter diameter size

Ordinary thread rubbing and rolling before the rough diameter diameter size should be consistent with the provisions of Table 1.

6 thread tool accuracy grade

Roll or rolling wheel accuracy level should be specified in Table 2 thread tolerance level and tool accuracy level corresponding to choose. Ordinary thread rolling plate and rolling wheel size should be consistent with the provisions of GB/T 972-2008 and GB/T 971-2008.

7 rough diameter adjustment

7.1 Recommended drawing or grinding process rough diameter. When using turning technology processing rough, the blank diameter should be specified in Table 1 Based on the arithmetic average deviation of its surface roughness profile double (2Ra). 7.2 Non-full tooth extrusion process thread, the minimum diameter of the blank can be used in Table 1 provides a smaller value. ......

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