GB/T 4251-2008 English PDF

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GB/T 4251-2008: Machine reamers with carbide tips
Status: Valid

GB/T 4251: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4251-2008	229	Add to Cart	3 days	Machine reamers with carbide tips	Valid
GB/T 4251-2004	279	Add to Cart	3 days	Machine reamers with parallel shanks with carbide tips	Obsolete
GB/T 4251-2003	RFQ	ASK	3 days	Machine reamers with parallel shanks with carbide tips
GB/T 4251-1984	199	Add to Cart	2 days	Machine reamers with parallel shanks with carbide tips	Obsolete

Similar standards

GB/T 33524.2   GB/T 972   GB/T 5104   GB/T 4256   GB/T 4247   GB/T 4243   

Basic data

Standard ID: GB/T 4251-2008 (GB/T4251-2008)
Description (Translated English): Machine reamers with carbide tips
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J41
Classification of International Standard: 25.100.30
Word Count Estimation: 10,171
Date of Issue: 2008-11-04
Date of Implementation: 2009-04-01
Older Standard (superseded by this standard): GB/T 4251-2004; GB/T 4252-2004; GB/T 4253-2004
Quoted Standard: GB/T 1443; GB/T 2075; GB/T 4246
Regulation (derived from): National Standard Approval Announcement 2008 No.18 (Total No.131)
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 carbide straight shank, Morse taper shank machine type and size of the knife money, position tolerances, material and hardness, appearance and surface roughness, signs and basic requirements for packaging. This standard applies to a diameter greater than 5. 3mm to 20mm carbide straight shank cutter machine with a mirror and a diameter greater than 7. 5mm to 40mm carbide taper shank machine mirror knife.

GB/T 4251-2008: Machine reamers with carbide tips

---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.
Machine reamers with carbide tips ICS 25.100.30 J41 National Standards of People's Republic of China Replacing GB/T 4251 ~ 4253-2004 Carbide machine reamer Posted 2008-11-04 2009-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 4251-2004 "Carbide straight shank machine reamers", GB/T 4252-2004 "Carbide Morse taper shank machine Reamer ", GB/T 4253-2004" carbide reamers - Technical requirements. " This standard and GB/T 4251-2004, GB/T 4252-2004, the main changes compared to the GB/T 4253-2004 as follows. --- The GB/T 4251-2004, GB/T 4252-2004 and GB/T 4253-2004 merged into one standard; --- 5.2.2 hinge on the shank or flat tail section hardness has been modified; 0.15IT "requirements; --- Canceled 3.3 length tolerance of "tolerance" word; --- Table A. Added Note 1; --- Made editorial changes. Appendix A of this standard is a normative appendix. The standard proposed by China Machinery Industry Federation. This standard tool by the National Standardization Technical Committee (SAC/TC91) centralized. This standard was drafted. a Tools Co., Ltd., Henan. The main drafters of this standard. Zhao Jianmin, Kong Chunyan, Fan Yingjie, Wang Zhuo Lin, Dong Xiangyang. This standard replaces the standards previously issued as follows. --- GB 4251-1984, GB/T 4251-2004; --- GB 4252-1984, GB/T 4252-2004; --- GB 4253-1984, GB/T 4253-2004. Carbide machine reamer

1 Scope

This standard specifies the carbide straight shank, Morse taper shank machine reamers types and dimensions, position tolerances, material and hardness, and surface appearance Roughness, signs and packaging the basic requirements. This standard applies to a diameter greater than 5.3mm to 20mm carbide straight shank machine reamers and to a diameter larger than 7.5mm 40mm carbide taper shank machine reamers.

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 1443 from machine tools and tool handles with clip cone (GB/T 1443-1996, eqv ISO 296.1991) GB/T 2075 Classification and use of cutting large groups and groups of application of hard cutting materials classification code (GB/T 2075- 2007, ISO 513.2004, IDT) GB/T 4246 reamer special tolerances (GB/T 4246-2004, ISO 522. 1975, IDT)

3 Tolerance

3.1 cutting portion Reamer diameter tolerance referring to GB/T 4246 design, the tolerance position according to the workpiece, cutting conditions and other circumstances may be appropriate to move on. Appendix A gives the processing H7, H8, H9 tolerance precision reamer diameter hole. 3.2 shank 3.3 length Reamer length tolerance according to Table 1. Table 1 length tolerance in millimeters To more than tolerance 6 30 ± 1.0 30 120 ± 1.5 120 315 ± 2.0 315 1000 ± 3.0

4 type and size

4.1 straight shank machine reamer of the type according to FIG. 1, give priority to the size of the Table 2, the diameter of the segment's size Table 3. Also needed teeth It can be made into a spiral or helical teeth. ......

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