GB/T 6414-2017: Castings -- Dimensional tolerances and geometrical tolerances and machining allowances (English PDF)
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GB/T 6414: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6414-2017 | English | 165 |
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Castings -- Dimensional tolerances and geometrical tolerances and machining allowances
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| GB/T 6414-1999 | English | 70 |
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Castings. System of dimensional tolerances and machining allowances
| Obsolete |
| GB/T 6414-1986 | English | RFQ |
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Dimensional tolerances for castings
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GB/T 6414-2017: Castings -- Dimensional tolerances and geometrical tolerances and machining allowances
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".
This Standard was proposed by and shall be under the jurisdiction of National
Technical Committee 54 on Foundry of Standardization Administration of China
(SAC/TC 54).
Responsible drafting organization of this Standard. Shenyang Research
Institute of Foundry.
Participating drafting organizations of this Standard. Anhui Research Institute
of Mechanical Science, Anhui Yingliu Group Huoshan Casting Co., Ltd., Hefei
Jianghuai Casting Co., Ltd., Anhui Shenjian Technology Co., Ltd., CRRC
Qishuyan Institute Co., Ltd., Tianrun Crankshaft Co., Ltd., CITIC Dicastal Co.,
Ltd., Tederic Heavy Machinery Co., Ltd., Cixi Huili Machinery & Electric Co.,
Ltd., Henan Huaihai Jingcheng Industrial Technology Co., Ltd., Hebei Jianzhi
Casting Group Ltd., Nanchang University, Dongfeng (Shiyan) Nonferrous
Casting Co., Ltd.
Main drafters of this Standard. Zhang Yin, Liu Dongmei, Wang Fang, Du Yingliu,
Qian Kuncai, Jiang Tianfang, Li Yong, Zhao Yongzheng, Pei Bing, Wei
Chuanying, Cong Jianchen, Cong Hongri, Bai Bangwei, Xie Mingli, Li Lifeng,
Luo Yu, Liu Quanrong, Song Liang, Cheng Kai, Chang Wei, Ren Jiuhong, Li
Guolin, Yang Zhaoling, Ye Han.
The previous editions of the standard replaced by this Standard were released
as follows.
- GB/T 6414-1986; GB/T 6414-1999.
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.
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
3 Terms and definitions
The terms and definitions defined in GB/T 5611 and the following ones apply to this document.
The taper on the pattern or core box wall parallel to the drawing direction, in
order to make the pattern easy to be taken out of the casting mould or the core
escape from the core box.
4 Dimension indication
Except for wall thickness dimensioning (a dimension chain consisting of two
dimensions is allowed), chain dimensioning shall be avoided.
5 Tilt elements
5.3 The taper of a special surface, which is different from the general taper
arrangement on the drawing, shall be separately indicated on the surface. The
indication shall comply with the provisions of GB/T 131, such as.
5.4 For the dimension to be machined, in order to obtain the finished dimension,
"taper +" shall be used; regardless of the general technical requirements for the
taper on the drawing.
6 Abbreviated terms
Abbreviated terms are given in Table 1.
7 Tolerance grades
The nominal dimension used in Table 3~Table 6 is the largest nominal
dimension of the casting structure. The nominal dimension of the fillet may be
ignored and does not need to be indicated separately.
For general orientation tolerances, a datum system shall be specified on the
drawing and identified by the indication “GB/T 6414-2017 DS” on the drawing.
Indication example.
8 Surface mismatch (SMI)
8.3 If it is necessary to restrict the value of the surface mismatch, in accordance
with GB/T 24744, the maximum permissible surface mismatch shall be stated
individually on the drawing.
9 Wall thickness tolerance
Unless otherwise specified, the wall thickness tolerances from DCTG1 to
DCTG15 shall be one grade coarser than the general tolerances of other
dimensions. For example, on a drawing with a general tolerance grade of
DCTG10, the wall thickness tolerance shall be DCTG11.
......
Source: Translated/reviewed by www.ChineseStandard.net / Wayne Zheng et al.
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