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GB/T 6414-2017 English PDF (GBT6414-2017)

GB/T 6414-2017 English PDF (GBT6414-2017)

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GB/T 6414-2017: Castings -- Dimensional tolerances and geometrical tolerances and machining allowances

GB/T 6414-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.040.10
J 31
Replacing GB/T 6414-1999
Castings - Dimensional tolerances and geometrical
tolerances and machining allowances
[ISO 8062-3:2007, Geometrical product specifications (GPS) -
Dimensional and geometrical tolerances for moulded parts - Part 3:
General dimensional and geometrical tolerances and machining
allowances for castings, MOD]
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: DECEMBER 29, 2017
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Dimension indication ... 7
5 Tilt elements ... 7
6 Abbreviated terms ... 9
7 Tolerance grades ... 9
8 Surface mismatch (SMI) ... 14
9 Wall thickness tolerance ... 15
10 Required machining allowance (RMA) ... 15
11 Indication on drawings ... 18
Annex A (Normative) Casting tolerances ... 20
Annex B (Informative) Application of general geometrical tolerances for castings ... 23
Annex C (Informative) Datums for general geometrical tolerances ... 32 Annex D (Normative) Required machining allowance grades (RMAG) ... 36
Annex E (Informative) Comparison of clause-subclause number between this Standard and ISO 8062-3:2007 ... 37
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 6414-1999 "Castings - System of dimensional tolerances and machining allowances". Compared with GB/T 6414-1999, the main technical changes of this Standard are as follows:
- Modify some tolerance values of dimensional casting tolerances;
- Modify the tolerance grades that can be achieved during mass production of various alloy castings in Table A.1;
- ADD Table 1 Abbreviated terms;
- ADD Table 3~Table 7;
- Modify the tolerance grades of Table A.1 and Table A.3;
- Delete the previous Annex C; ADD new Annex C, D and E.
This Standard uses the redraft law to modify and adopt ISO 8062-3:2007
"Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings".
Compared with ISO 8062-3:2007, this Standard has many adjustments in
structure. Annex E lists the comparison of clause-subclause number between this Standard and ISO 8062-3:2007.
The technical differences between this Standard and ISO 8062-3:2007 and their reasons are as follows:
- ADD the nominal dimension of casting and illustration in Clause 3 Terms and definitions;
- ADD Clause 4 Dimension indication;
- ADD Clause 5 Tilt elements;
- ADD the graphical description of required machining allowance in Clause 10.
This Standard has made the following editorial change:
- CHANGE the standard name to "Castings - Dimensional tolerances and
geometrical tolerances and machining allowances".
Castings - Dimensional tolerances and geometrical
tolerances and machining allowances
1 Scope
This Standard specifies the terms and definitions of dimensional tolerances, geometrical tolerances and machining allowances of castings, dimension
indication method, dimensional casting tolerance grades, geometrical tolerance grades, required machining allowance grades and their indications on drawings. This Standard applies to castings produced by various casting methods.
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
GB/T 131 Geometrical Product Specifications (GPS) - Indication of Surface texture in technical Product documentation
GB/T 1182 Geometrical product specifications (GPS) - Geometrical
tolerancing - Tolerances of form, orientation, location and run-out
GB/T 1800.1 Geometrical product specifications (GPS) - Limits and fits - Part 1: Bases of tolerances, deviations and fits
GB/T 1800.2 Geometrical product specifications (GPS) - Limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts
GB/T 4458.5 Mechanical drawings - Indication of tolerances for size and of fits
GB/T 5611 Foundry terminology
GB/T 16892 Geometrical tolerancing indication of non-rigid parts
GB/T 17851 Geometrical Product Specifications (GPS) - Geometrical
tolerancing - Datums and datum system
GB/T 24744 Geometrical product specifications (GPS) - Drawing indications

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