GB/T 21470-2008 English PDF

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GB/T 21470-2008: Machining allowances and tolerances for steel open die forgings on hammer -- Disks, columns, rings and seamless cylindrical sleeves
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21470-2008	369	Add to Cart	3 days	Machining allowances and tolerances for steel open die forgings on hammer -- Disks, columns, rings and seamless cylindrical sleeves	Valid

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Basic data

Standard ID: GB/T 21470-2008 (GB/T21470-2008)
Description (Translated English): Machining allowances and tolerances for steel open die forgings on hammer -- Disks, columns, rings and seamless cylindrical sleeves
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J32
Classification of International Standard: 77.140.85
Word Count Estimation: 16,155
Date of Issue: 2008-02-28
Date of Implementation: 2008-08-01
Older Standard (superseded by this standard): GB/T 15826.2-1995; GB/T 15826.3-1995; GB/T 15826.4-1995; GB/T 15826.5-1995
Quoted Standard: GB/T 21469; JB/T 9179.4; JB/T 9179.5; JB/T 9179.7; JB/T 9179.8
Regulation (derived from): National Standard Approval Announcement 2008 No.3 (Total No.116)
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 disk, column, perforated disc, ring, sleeve forgings mechanical and other types of allowances and tolerances. This standard applies to open die forgings up to 0. 9% carbon content and other alloying elements does not exceed 4% of the total content of carbon steel and alloy steel. Where beyond the scope of this standard forgings, and the remaining amount of tolerance be negotiated by both parties.

GB/T 21470-2008: Machining allowances and tolerances for steel open die forgings on hammer -- Disks, columns, rings and seamless cylindrical sleeves

---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.
Machining allowances and tolerances for steel lpen die forgings on hammer. Disks, columns, rings and seamless cylindrical sleeves ICS 77.140.85 J32 National Standards of People's Republic of China Replacing GB/T 15826.2 ~ 15826.5-1995 Steel forgings on hammer mechanical allowance And tolerance plate, columns, rings, cylinder class Posted 2008-02-28 2008-08-01 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, column 1 class 4 perforated disc category 3 5 Class 3 Ring 6 sleeve class 8 Calculation Appendix A (informative) ring forgings class size, for example 11 Calculation Appendix B (informative) sleeve forgings class size, for example 12

Foreword

This standard is GB/T 15826.2-1995 "hammer on steel forgings Machining allowances and tolerances Disks and columns" GB/T 15826.3-1995 "hammer on steel forgings Machining allowances and tolerances perforated disc class", GB/T 15826.4-1995 "Hammer on steel forgings Machining allowances and tolerances class ring", GB/T 15826.5-1995 "hammer on steel forgings machining Workers margin and tolerances sleeve class "on amendments. The main amendments are as follows. --- The GB/T 15826.2-1995, GB/T 15826.3-1995, GB/T 15826.4-1995, GB/T 15826.5- 1995 integrated as a standard. --- Increased directory and foreword. --- Increasing the normative references. --- The GB/T 15826.4-1995 in the "3.2 Example Calculation" content as "Appendix A". --- The GB/T 15826.5-1995 in the "3.3 Example Calculation" content as "Appendix B". Appendix A of this standard and Appendix B is an informative annex. The standard proposed by China Machinery Industry Federation. This standard by the National Standardization Technical Committee forging. This standard was drafted. Shanghai Hudong Forge, Instrument Co., Ltd. Pinghu City morning people. The main drafters of this standard. Sun Fen Chang, Dong beads students. The standard standard replaces the previous editions. --- GB/T 15826.2-1995; --- GB/T 15826.3-1995; --- GB/T 15826.4-1995; --- GB/T 15826.5-1995. Steel forgings on hammer mechanical allowance And tolerance plate, columns, rings, cylinder class

1 Scope

This standard specifies the disk, columns, perforated disk, ring, sleeve and other types of forgings Machining allowances and tolerances. This standard applies to the free carbon content of not more than 0.9%, and other alloying elements the total content of not more than 4% of carbon steel and alloy steel Forgings. Where beyond the scope of this standard forgings, and the remaining amount of tolerance by both parties prior consultation.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 21469 hammer on steel forgings Machining allowances and tolerances General requirements JB/T 9179.4 on free forging hydraulic press Machining allowances and tolerances disc and punching class 9179.5 forgings on hydraulic press Machining allowances and tolerances Cylindrical class JB/T JB/T 9179.7 on free forging hydraulic press Machining allowances and tolerances cylinder class JB/T 9179.8 on free forging hydraulic press Machining allowances and tolerances class ring 3, column type 3.1 circular cross section, rectangular (A1/A2≤2.5), hexagonal plate forgings class size should be consistent 0.1D≤H≤D (or A1, S); A circular cross section, rectangular (A1/A2≤2.5), hexagonal column dimensions conform to class forgings D < H≤2.5D (or A1, S). 3.2 and columns forgings Machining allowances and tolerances shall comply with Figure 1 and Table 1. Shall comply with the remaining 3.3 GB/T 21469 of. Figure 1 ......

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